JP2001016227A - Diversity/hand-over processor, communication control system and diversity synthesis method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To interconnect an existing digital or analog communication network to an asynchronous transfer mode ATM communication network, or a mobile communication network or the Internet. SOLUTION: A common buffer memory section 301 stores a received ATM cell, which is shared by each connection. A synthesis/copy processing section 302 applies selection synthesis processing or copy processing to a read ATM cell. Address first-in first-out FIFO 3011-1-3011-P store read addresses of ATM cells by each connection. A synthesis/copy information table 309 indicates how to process synthesis/copy for each connection. A synthesis/copy control section 308 reads the synthesis/copy information table 309 in matching with the timing from a CPU 60, reads an ATM cell according thereto and conducts processing instruction. A buffer capacity table 301 manages the number of blocks consisting of a plurality of ATM cells stored in a common buffer memory section 301.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
In connection with the configuration of the handover processing device and the communication network control system, in particular, a plurality of media (audio / video /
The present invention relates to a communication network control system for a multimedia communication network suitable for handling data) and a diversity handover processing device used in the system.

[0002]

2. Description of the Related Art In today's digital communication network, in addition to a conventional wired communication network using a metallic wire or an optical fiber, a communication network using a radio signal as a medium for signal transmission, such as a mobile communication network, is increasing. . This mobile communication network is described in the existing STM communication network (Synchronous Transfer Mode) communication network and "Easy Digital Switching" issued by the Telecommunication Association, as shown in "Mobile Communication Handbook" issued by Ohm Company. A time-division communication network that carries a signal on time-division time slots in a synchronized frame as described above.
PDC that communicates by placing signals in time slots as in
(Personal Digital Cellurar) and PHS (Personal Ha
ndyphone System) communication network, and CDMA (Co) that modulates and communicates using a different code for each signal as shown in "Easy Digital Mobile Communication" issued by the Telecommunications Association.
de Division Multiple Access) communication network.
Furthermore, "Nikkei Electronics n" issued by Nikkei BP
o. 680 "on page 85 and beyond
MA (hereinafter referred to as W-CDMA (Wide band CDMA)) has a quality similar to that of an existing wired communication network even when signals of various types and speeds such as voice, image, and high-speed data are moved at high speed. It is a communication network that attracts attention as a communication system that can transmit and receive, and is expected to be rapidly introduced.

On the other hand, the current communication network is STM (Synchrono
us Transfer Mode) a communication network, a packet communication network that carries a signal by putting a signal on a variable-length packet as shown in “Basic knowledge of data exchange” issued by the Telecommunications Association, and a “B -Asynchronous transfer mode communication network (hereinafter referred to as ATM) that carries a signal in fixed-length packets called cells as shown in
(Referred to as “Asynchronous Transfer Mode” communication network), and “Master Ring TCP / I” issued by Ohm.
As shown in "P", a signal is put on a variable-length packet called an IP packet and an Internet protocol (I
There are various communication networks such as an IP network (Internet) that performs IP packet communication according to a procedure P).
Each media of voice, image, and data is communicated.

[0004]

The actual communication networks and communication systems described above have been developed and introduced independently of each other, and the signal format (speed / format) and communication procedure (signal system, protocol, etc.) And so on). Further, since the characteristics of the communication network are different, the communication services to be provided and the control mechanism for providing the services (for example, the configuration of the operation system, the configuration of the hardware / software interface, and the function and configuration of the communication application software) are also required. Differences exist.

[0005] From the communication network users who transmit and receive information using the communication network and the providers who provide the communication network, the difference between the above communication networks is eliminated (or absorbed), and the configuration and procedure of the communication network are eliminated. The ability to communicate with the other party using the communication service that can optimally communicate information with the device (terminal) that you want to use when you want to use it without worrying about the communication equipment improves the usability of communication equipment and reduces communication costs, It is eager to lead to social development and contribution.
That is, a communication network integrating the various communication networks described above,
There is a need to provide a communication network control system / communication control apparatus and a control method for connecting between networks that can communicate with each other under simple control by absorbing differences between communication networks. It is. In particular, mobile communication networks such as W-CDMA are expected to rapidly develop in the future, and it is necessary to construct an integrated communication network by interconnecting various existing communication networks and mobile communication networks. is important.

[0006] There are cases where the correspondence of signal processing and the like must be changed due to the difference in media and the interrelationship with other networks. As an example of signal processing unique to a mobile object, there is a signal processing that requires an error correction coding process. On the other hand, there is a case where it is better not to perform such a coding process due to connection with an existing communication network. Further, in mobile communication, there is an interleaving technique to withstand a burst error. This technique is described in, for example, "Mobile Communication", edited by Shinmei Masaaki, published by Maruzen Co., Ltd., but rearranges and transmits data processed by Reed-Solomon code and the like, and reversely rearranges it on the receiving side. Things. When rearranging, a block memory of m rows and n columns is used, so that there is a delay for storing the data in this memory. Therefore, in a service such as voice, which has a problem of delay time, the interleaving process may not be performed even if the error correction capability is reduced.

After the interleave processing, if one predetermined unit of data in the block memory is read at a stretch,
This data is bursty data, and when transferring to a mobile communication network, smoothing must be performed according to network timing, and a buffer for receiving such a burst signal is required. When interleaving is not performed, no burst signal is generated, and only timing control for the mobile communication network needs to be performed.

Further, when a file is downloaded by accessing the Internet, the traffic is one-way from the network side to the terminal side. Therefore, if it is assumed that the same traffic passes in both directions, either one of them is used. Device resources may be wasted. It would be good if we could statistically calculate the usage rate of each media and build a device and network configuration that suits this.However, the media used by the user changes every day, and furthermore, due to the interconnection with other networks, Changes. Therefore, when considering connections to various networks, various services must be able to be supported for each connection, and the economy must not be further impaired. In general, diversity handover is a process of performing quality evaluation on a packet-by-packet basis and selecting a high-quality packet. On the other hand, in order to improve the line efficiency between the wireless base station and the communication network control system (GW), the wireless base station stores a plurality of CPS packets in a single ATM cell payload, and then transfers the ATM cell to the network. To be sent to In this case, usually the GW
Decomposes ATM cells into packets, and one CP
Unless one ATM cell is generated for each S packet, diversity handover processing cannot be performed. This is because diversity handover performs quality evaluation on a packet basis. Therefore, GW
, The number of ATM cells is doubled by the amount of CPS packets, so that the processing in the GW takes several times the load as compared to processing ATM cells on a wired line.
There is a problem that a switch in the GW requires a more efficient switch. Further, in the case of conventional communication between fixed telephones, once a call connection is made, generally, the communication path is not changed during communication. However, in the case of mobile communication, since the wireless terminal can move, the wireless base station with which the wireless terminal communicates can be changed even after performing a call connection. With the change of the radio base station, a process of adding and deleting a communication channel occurs inside the communication control network control system accommodating them. Furthermore, in the CDMA system, since a diversity handover process is performed, a plurality of communication paths must be secured for one wireless terminal or they must be deleted in the communication network control system. As described above, especially in the CDMA mobile system, there is a problem that the process of adding and deleting a communication path must be performed more frequently than in a fixed telephone. Furthermore, since it is necessary to secure more communication paths than the number of wireless terminals to be connected, resources inside the communication network control system must be used effectively, that is, the deleted communication path resources must be used immediately immediately. , There is a problem.

It is an object of the present invention to provide a diversity handover processing apparatus for realizing integration or interconnection between a mobile communication network and an existing communication network as described above, a communication network control system using the same, and An object of the present invention is to provide a diversity combining method.

Further, the present invention provides a communication network control system and a communication network control device suitable for controlling a communication network in order to realize integration or interconnection between a mobile communication network and an existing communication network. Providing a method with a simple configuration and procedure, particularly a mobile communication network control system and a mobile communication network control device suitable for realizing integration or interconnection between a mobile communication network and an existing communication network, It is an object to provide a control method with a simple configuration and procedure.

According to the present invention, for example, in a state in which an existing communication network is left as it is, the communication capability and the provided service originally provided in the communication network are maximized, Connect the mobile communication network to each existing communication network and perform necessary signal conversion, exchange, or control processing to implement interconnection and communication service provision, so as not to impair the capabilities and services provided. A communication network control system, a communication network control device, and a control method for providing information to a desired destination to a desired destination by a desired medium from a terminal of the communication network with a simple configuration and procedure. With the goal.

Further, the present invention provides a communication system in which a communication network control system accommodates an exchange system for connecting a mobile communication network to an existing communication network, and performs interworking between the mobile communication network and a heterogeneous communication network. To provide a communication control system and a control method for realizing a service, in which it is not necessary to be aware of a control method peculiar to the opposite communication network, and only to be aware of a control method as a single interface device. With the goal.

When a mobile terminal moves to a service area of another radio base station while communicating, a process (handover) for switching a radio base station to communicate with is required. In particular, in CDMA, in order to perform diversity handover while simultaneously communicating with a plurality of radio base stations, communication information for a mobile terminal must be copied on the network side and passed to a plurality of radio base stations involved in the handover. Therefore, exchange of control signals related to handover on the network side becomes complicated, and communication traffic accompanying the handover imposes a heavy burden on the network. Accordingly, it is an object of the present invention to provide a communication network control system and an apparatus and a control method thereof that can simultaneously connect to a heterogeneous network while solving the problems unique to CDMA mobile communication.

Further, according to the present invention, there is provided a demultiplexing apparatus and a demultiplexing method for separating and multiplexing a signal from a received ATM cell for each processing unit (such as a diversity handover processing unit (DH)) which is to be in charge of processing. The purpose is to provide. In CDMA mobile communication, control signals are more complicated and diversified than before, and the amount of traffic is enormous. Therefore, in order to perform high-speed signal processing on the network side, signal processing required for each signal is required. Section (DH etc.)
It is necessary to achieve load distribution by function distribution. Therefore, the present invention enables higher-speed signal processing on the network side by organizing and transferring control signals and the like from a mobile terminal or a radio base station for each processing unit to be in charge of processing. With the goal.

It is another object of the present invention to provide an apparatus for reducing useless buffers by performing timing control in a diversity handover processing apparatus. Further, since the number of ATM cells is doubled by the number of CPS packets in the GW, processing in the GW is several times as heavy as processing ATM cells in a wired line. It is an object of the present invention to sufficiently handle such a large load by using a switch having a more efficient common buffer memory unit as a switch in the GW.
Especially in CDMA mobile systems,
Since it is necessary to add and delete communication paths more frequently and to secure more communication paths than the number of wireless terminals to be connected, the present invention provides a switch having a common buffer memory unit. The purpose of the present invention is to effectively use resources inside the communication network control system using, for example, to immediately and effectively use the deleted speech path resources.

[0016]

According to a first aspect of the present invention, there is provided a diversity handover processing apparatus in a communication network control system for interconnecting a radio communication network and another communication network, wherein A common buffer memory unit for storing cells, a combining / copy information table for storing correspondence between wireless terminals, and connections for combining or copying ATM cells; and a combining / copy information table for target wireless terminals. A combining / copying control unit for reading information relating to a connection within the unit, and a common buffer for instructing an address of the connection read by the combining / copying control unit and controlling to read out an ATM cell of the address from the common buffer memory unit. A memory control unit and an ATM cell read from the common buffer memory unit. Providing diversity handover processing apparatus includes a combining / copy processor for performing deposition or copy.

According to a second aspect of the present invention, there is provided a communication network control system for connecting a plurality of types of communication networks to transfer information by providing a plurality of the above-mentioned diversity handover processing apparatuses. A plurality of interfaces for converting signals from a plurality of types of devices into ATM cells to which a header destined for the desired diversity handover processing device is added, and a plurality of input lines and output lines, A diversity handover processing apparatus, accommodating the interface, and receiving an ATM cell received from the interface on one of input lines by the A
An ATM switch for transferring to any of a plurality of output lines based on header information of the TM cell, wherein the diversity handover processing device converts the ATM cell into an ATM cell to which a header addressed to a desired device is added, Provided is a communication network control system for outputting to an ATM switch. According to a third solution of the present invention,
In a diversity combining method in a mobile communication system, a step of adding quality information of each packet for each packet; a step of assembling a first ATM cell including a plurality of packets to which quality information has been added by the adding step; Transmitting the first ATM cell assembled by the step of assembling the first ATM cell; receiving the first ATM cell transmitted by the transmitting step; and receiving the first ATM cell transmitted by the transmitting step. Disassembling one ATM cell into a plurality of packets, assembling a second ATM cell so as to include at least one packet obtained by the disassembly, and assembling the second ATM cell Second AT assembled by steps Out of the M cells, the second A
Selecting a high-quality packet based on quality information of a packet included in a TM cell.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a communication network control system and a diversity handover processing apparatus according to the present invention will be described in the following order (1) to (5) with reference to the drawings. (1) Communication network control system (2) Diversity handover processing device (3) Signal processing for DH between base station and communication network control system (4) Operation when wireless terminal moves in each zone (5) ) Operation during selection / combination

The embodiment of the present invention described below is merely an example, and the communication network control system and the diversity handover processing apparatus of the present invention include an ATM communication network and an IP.
The present invention can also be applied to interconnection between other types of communication networks such as a communication network, an STM communication network and an IP communication network.

(1) Communication Network Control System FIG. 1 is an example of a configuration diagram of a communication network using the communication network control system of the present invention. The numbering of the components shown below indicates the configuration by the first number, and the numbers following the hyphen indicate other components of the same configuration. However, it may be expressed only by the first number. The communication network is a communication network control system according to the present invention.
(GW) Switching system for connecting heterogeneous networks with one (N)
S) The multimedia communication network 100 provided with
Mobile communication network 1 such as A, W-CDMA, PDC, PHS, etc.
01, an ATM communication network (for example, a cell relay network) 102 for transmitting and receiving information in an ATM cell, and an IP communication network (for example, NTT (Nippon Telephon) for transmitting and receiving information in IP packets.
e Telegraph) 103, an STM communication network for transmitting and receiving information in time-division multiplexed time slots (for example, a digital switching network or INS provided by NTT).
(Information Network System) 64 and the like.

The communication network control system (hereinafter referred to as GW) of the present invention
1) is connected to the mobile communication network 101, controls the mobile communication network 101, and terminates or converts a signal unique to the mobile communication network. When communication is performed between the terminal MS of the mobile communication network 101 and the terminal 106 of a user accommodated in another communication network, the GW 1 uses an exchange system (hereinafter abbreviated as NS) for connecting heterogeneous networks. And 2) transmitting and receiving control information necessary for communication and information to be communicated. The GWs 1 and the NSs 2 are appropriately connected to each other, accommodate various communication networks, and connect the mobile communication network to another heterogeneous communication network. GW1 and NS2 are 1
It may be configured as one system or device.

FIG. 2 is a block diagram schematically showing a communication network control system 1 according to the present invention. The communication network control system (GW) 1 includes an ATM switch (ATM SW) 10,
TM interface (ATMIF) 20, diversity handover processor (DH) 30 for executing diversity and handover, etc., demultiplexer (MUX)
40, signal processing device (SIG) 50, control device (CP)
60, multimedia signal processor (MSP (Multimedi
a Signal Processor (or Processing unit)) 70,
A trunk (TRK) 80 is provided.

The ATM switch (ATMSW) 10
Various information (voice, image, data, etc.) that is converted into TM cells and transmitted and received between users, and the processor of the control device 60 and each device (communication network or communication network interface device, each functional block in the system) This is an ATM switch for exchanging control information transmitted and received between the ATM switches with a signal having a configuration in which the ATM cell header is included. The GW 1 connects to a large number of mobile communication networks 101 and various communication networks.
Since the ATMSW 10 is desirably a switch that does not cause cell loss, an economical and highly reliable communication network control system can be realized by using a common buffer type ATM switch (for example, see JP-A-2-1669). AT
The MIF 20 has an interface function with an ATM communication network. An Internet Protocol Interface (IPIF) 25 having an interface function with the Internet
May be further provided. The SIG 50 has a function of transmitting / receiving a control signal to / from a mobile communication network, another GW 1 or NS2, or another functional block in the system as described later. Note that the SIG 50 may be provided inside an appropriate interface. The control device 60 controls the entire GW, and performs processing of control signals transmitted and received between functional blocks and control of exchange of control information and information between functional blocks. In addition to the above-mentioned control device 60 in which control information is transmitted and received in an ATM cell, there is also a method of directly transmitting and receiving control signals to and from each functional block using a control signal line. Trunks 80
It is a device such as a copy trunk for copying an ATM cell for paging or broadcasting to a mobile terminal of a mobile communication network.

Diversity handover processor (DH) 30 for executing diversity, handover, etc.
Is provided to prevent instantaneous call interruption and quality deterioration when the mobile terminal MS moves during communication in the mobile communication network 101. Signals transmitted to and received from a plurality of base stations BS at the time of handover or the like are provided. This is a device that performs diversity for selecting and combining signals having excellent call quality based on the signal. The demultiplexer (MUX) 40 is, for example, a radio industry association (ARI).
Demultiplexing various control signals (call setting, location registration, handover processing) transmitted / received by the mobile communication network and inter-user information (voice / image / data) transmitted / received between terminals, as discussed in B) And a device for transmitting and receiving the function blocks to be processed. The multimedia signal processing device (MSP) 70 transmits and receives information between the user of the mobile communication network and the user, and guarantees the interconnection between the mobile communication networks or between the mobile communication network and the terminal of the heterogeneous communication network. ,
This is a device that performs necessary processing such as code conversion and encryption, and matching with the signal format of the existing communication network.

In the present embodiment, NS2 is disclosed in Japanese Patent Application Nos. 11-40287 and 11-5495.
The switching system described in No. 9 can be used.

FIG. 3 is a block diagram showing the outline of the switching system (NS) 2. As shown in FIG. The switching system 2 includes an ATM switch (ATMSW) 210, an ATM interface (ATMIF) 220, an STM interface (STM
IF) 230, IP interface (IPIF) 24
0, signal processing device (SIG) 250, control device (CP)
260, trunks (TKY, TRK) 270, and a management and maintenance device (OAM) 280.

The ATM switch (ATMSW) 210 is
Various information (voice, image, data, etc.) converted to ATM cells and transmitted and received between users, and control information transmitted and received between the processor of the control unit 260 and each device (communication network or communication network interface device) Is an ATM switch for exchanging with a signal having a configuration in which is inserted in the header of an ATM cell. The ATMIF 220 has an interface function with an ATM communication network. The STMIF 230 has an interface function with an STM communication network. IPIF 240
It has an interface function with the Internet. SI
The G250 has a function of transmitting and receiving a control signal to and from each communication network, and a plurality of types can be provided according to required signal conversion, protocol conversion, and the like. Control unit 26
Numeral 0 controls the switching system as a whole and processes call control signals exchanged between communication networks and performs switching control. The trunks 270 are response devices such as a talkie or devices having functions necessary for realizing various services. The management and maintenance device 280 is a block that performs monitoring, maintenance and management of the switching system, clock supply, and the like.

The switching system is for connecting to various communication networks. Since the ATMSW 210 is desirably a switch having a large capacity and no cell loss, a common buffer type A is used.
A TM switch (for example, see Japanese Patent Application Laid-Open No. 2-1669) and a cell division type ATM switch (for example, see Japanese Patent Application Laid-Open
-98917) can realize an economical and highly reliable switching system. In the present specification, a signal having a configuration in which control information and the like are included in the information section of an ATM cell is simply referred to as an in-channel.

For example, when a terminal of the ATM communication network 102
When a call is made to a terminal of the TM communication network 104, a signal for controlling connection is sent from the ATMIF 220 to the ATMSW 210 and the S
The data is input to the control unit 260 via the IG 250. When the control unit 260 confirms the availability of the terminal of the STM communication network 104 by the call connection control, the control unit 260 uses the ATMIF 210 in-channel.
And STMIF 230 are set and controlled.
ATMSW210 between F220 and STMIF230
It operates so that information between terminals can be exchanged, converted, and transmitted / received via. If there is a connection request from the terminal to the Internet 103, an IPIF
240 is selected and the same operation is performed. Also, a necessary talkie or trunk can be selected from the trunks 270 during communication control and connected to each communication network interface.

Next, the configuration and operation of the communication network control system of the present invention will be described in detail. FIG. 4 is a block diagram showing a detailed configuration of the communication network control system of the present invention.
In this figure, particularly, the configuration and arrangement of the SIG 50 in the GW 1 are shown in detail. A dotted line in the ATMSW 10 indicates that a representative connection is established, for example.

The communication network control system GW1 of the present invention includes the NS2 of the mobile communication network 101, the ATM communication network (multimedia communication network) 100, and the IP communication network (Internet) 1.
ATMIF 20-1 to ATMIF 20-1
0-i (opposite the mobile communication network 101), ATMIF 20-
i + 1-20-j (for NS2), ATMIF20-j
+1 to 20-m (facing GW) and DH30-1 to DH30-1
0-i, MUX40-1 to 40-o, SIG50-1
50-n, the control device 60 including a plurality of processors for controlling the GW 1, the MSP 70, and the trunks 80 are each connected to the ATMSW 10 as illustrated.

Signal processing devices (SIG) 50-1 to 50-
n is the mobile terminal MS or base station B of the mobile communication network 101
S, ATM network 100 (NS2), other GW 1, IP network 1
03, other functional blocks in the system (DH30, MU
X40, MSP70, etc.) via the ATMSW 10 to process control signals input / output from each network or device, specifically, communication formats such as control signal format and protocol conversion and termination processing. A plurality of devices and a plurality of types are accommodated in the ATMSW 10. In the embodiment, as described in Japanese Patent Application No. 11-54959, SIGs 50-1 to 50-n are provided to absorb differences in signal formats and communication protocols of signals transmitted to and received from various communication networks and devices. Conversion / termination (communication processing) and transmission / reception of the communication-processed signal to / from the control device 60 or transmission / reception of the communication-processed signal to / from each interface with another communication network. That is, SIG50-1 to SIG50-50
-N converts and absorbs differences in control signals and converts them to signals of a unified control unit interface, or converts information between communication network interfaces in order to transfer information between different communication networks. It is. SIG50-1
Due to such conversion operation, even if control signals having various forms and procedures are input / output from each communication network, the control device 60 analyzes and processes each control signal and performs call processing such as call processing. Can operate software for providing the communication service requested by the user. SIG50-
1 to 50-n may be of a load distribution type as required.

The control device 60 includes a communication network control system GW
1, a resource management processor (RMP) 640 having a function of performing overall resource management, a maintenance / operation processor (OMP) having a function of performing maintenance / operation of the GW 1 and an interface function of communicating with a maintenance / operation center provided outside. ) 650, ITU-T (International Teleco
mmunication Union, a common channel signal processor (C) having a function of processing common channel signals and an interface function with a common channel signal network specified by the recommendation of the International Telecommunication Union.
SP) 620, and a call processing processor (CLP) 630 for terminating a call control signal from each communication network and realizing a switching control function of a multimedia call, and distributing functions among the processors to control the entire GW1. Configuration. More specifically, ATM HUB6, which is a dedicated ATM switch for transferring messages exchanged between the processors.
10 to control the GW 1 by connecting the processors. In addition, CLP630-1 to 630-k
Can be constituted by a plurality of processors according to the capacity (load) of the GW1, and the plurality of CLPs 630-1 to
The load can be distributed between 630-k. Also, A
The switch used for the TM HUB 610 connects the processors and does not require a switch having a large capacity as compared to the ATMSW 10. Therefore, a switch similar to the ATMSW 10 with a reduced capacity may be used. Also, ATM
The HUB 610 has a configuration in which all processors are directly connected by lines and messages are exchanged based on the address indicated by the cell header. The details of the control device 60 are as follows.
It is described in Japanese Patent Application No. 11-47959.

The diversity handover processing device (DH) 30 is provided for accommodating the mobile communication network 101 in a multimedia communication network. In the mobile communication network (CDMA), the mobile terminal MS is in communication with the mobile terminal MS. When a diversity handover is performed in response to the above, a plurality of paths are set between the terminal MS, the plurality of base stations BS, and the GW1, and information is transmitted and received. This is a device for selectively generating a signal.
In the communication network control system GW1 of the present invention, a plurality of DH30s
-1 to 30-i are accommodated in the ATMSW 10, and when there is a handover request from the MS (or BS), the SIG 50
The control device 60 analyzes the request and selects and designates an appropriate DH 30 to perform the diversity handover. With this configuration, G of the present invention
W1 is a diversity handover that can be reliably performed even when a large number of paths are set at the time of handover by moving a large number of terminals BS in a mobile communication network at high speed. It is possible to provide a communication system which does not cause deterioration of the communication system.

Further, as described above, the timing control is performed between the devices, and the DH 30 controls the cell transmission timing in order to efficiently transmit data from the BS to the MS in the mobile communication network 101. The timing of transmission from the BS to the MS may be different for each MS. Therefore, based on the timing matched between the devices, control is performed so that the timing is suitable for each connection. Also, of the signals from the MSP 70, the burst signals received in interleaved block units are smoothed, and then each M of the mobile communication network 101 is smoothed.
The transfer may be performed at a timing suitable for S. In the reverse direction, when the interleaving process is performed by the MSP 70, the signals from the mobile communication network 101 are collectively transferred to the MSP 70 by the DH 30 in units of interleaved blocks. Also, when handling packets assembled from a plurality of ATM cells in the MUX 40, as in the case of interleaving in the DH 30, the signals in packet units are smoothed and transferred to the mobile communication network 101, and conversely. In some cases, the packet may be transferred to the MUX 40 collectively.

As discussed in the Radio Industries and Businesses Association (ARIB), for example, in a mobile communication network, various types of mobile communication are used in addition to control signals for call connection control of an existing wired communication network. It is transmitted and received from a network-specific control signal (location registration, handover processing, etc.) or from the terminal MS or the base station BS. In addition, the band of information (signals) transmitted and received between terminals is wide, and various types of user-to-user information (voice, image, and data) are transmitted and received. Further, in a state where these control signals and information between users are mixed (multiplexed) in a packet-like form, they are transmitted and received at random timing and lines (ATMIF 20) from a moving terminal MS or base station BS. . The demultiplexer (MUX) 40 transmits and receives control signals and user-to-user information transmitted / received to / from the mobile communication network with the above-described various and complicated timings and configurations to / from functional blocks in which the respective signals must reliably process. This is an apparatus for performing identification multiplexing / demultiplexing processing on signals transmitted / received to / from a mobile communication network. In the GW 1 of the present invention, a plurality of MUXs (40-1 to 40
-O) is accommodated in the ATMSW 10 and a large number of signals transmitted and received with the mobile communication network are distributed to an appropriate MUX 40 and processed. Here, various control signals and information between users are separated, and the control information is transmitted and received to and from an appropriate SIG 50,
Operation of GW1 processed by control device 60 (communication network control)
Progresses to establish a connection between mobile communication networks or a heterogeneous communication network. Further, the inter-user information is transmitted / received to / from the destination device based on the connection control.

In general, mobile communication networks (CDMA, W-C
In DMA, the band of information (signal) transmitted and received by a user at a terminal is wide, and various types of inter-user information (voice,
Since images and data are transmitted and received, various communication services can be provided. On the other hand, even in the existing communication network, A
There are communication networks such as a TM communication network that handle multimedia in a broadband communication and can provide various communication services. The multimedia signal processor (MSP) 70 transmits / receives information between users to / from a terminal of a mobile communication network, and processes the information between users by encoding or encryption so as to provide various communication services. Alternatively, in order to enable communication with heterogeneous terminals, conversion of encoding rules and encryption rules and conversion of media are performed. Further, in order to guarantee mutual connection with terminals of an existing heterogeneous communication network, the apparatus performs necessary processing such as code conversion and encryption and performs matching with the signal format of the existing communication network. In the GW 1 of the present invention, such an MSP 70 is
The information between users accommodated in the TMSW 10 and transmitted / received in various formats from various lines to various destinations is temporarily AT
An economical system is realized as a configuration for collecting and processing all via the MSW 10. In addition, this MSP70 is GW1
The GW1 is installed as a separate device outside the MSP70.
May be configured as a system that shares the same.

The signals from the above-described functional blocks (each communication network interface, SIG, each processor) are all converted into ATM cells 1000, 1100, 1200 except for messages transferred between a plurality of processors for control. , The logical paths P1 to P set in the ATMSW 10
5 (FIG. 4, path set between dotted lines in ATMSW 10)
Is used to transfer between the blocks. Specifically, as described in JP-A-63-72293, when each functional block adds destination information to the header of the ATM cell, the ATMSW 10 sends the ATM cell to the destination of the information by a logical path based on the header information. This is a configuration in which self-routing is performed to a function block that becomes The assignment of destination information in each functional block is performed by providing a table in which destination information is stored in advance in each functional block, as disclosed in Japanese Patent Application Laid-Open No. 3-218142, and when a signal to be transmitted is input. The destination information is added to the header by referring to the table. The contents of each table are set from the management and maintenance device in the system or an appropriate management device (not shown) when the GW 1 is installed or the configuration is changed.

Here, a signal is transmitted from the base station BS to the communication network control system GW1, for example, according to ITU-TI. 363.
When the data is transferred in the AAL type 2 format defined in the C.2, that is, when CPS packet signals from a plurality of terminals MS are multiplexed into one ATM connection, each ATM CPS (Character
(s Per Second)
The packet is packed in the payload of the M cell, and destination information given for each channel of each CPS packet is added to the ATM cell. As a result, the signal for each terminal MS becomes ATMSW1
0 enables routing, and further, inside the DH 30, signals for each terminal MS can be identified. And ATM
The signal from the SW 10 to the ATMIF 20-1 is based on the ITU-
TI. It is multiplexed into ATM cells based on 363.2 and transferred to the BS. Here, the contents of each table are obtained by analyzing the control signal extracted by the management and maintenance device 80 or an appropriate management device (not shown) in the system, or the MUX 40 or SIG 50 when the GW 1 is installed or the configuration is changed. It is configured to be set from the CP60 or the like. For example, when a signal of a certain terminal MS is processed by the DH 30-1, and then this terminal MS performs diversity handover and communicates with a plurality of BSs, a signal connected at this time is: Unless it is input to the DH 30-1, the selective combining process and the copy process cannot be performed. Thus, the connection subject to the diversity handover process is
The CP 60 sets the ATM TF 20-1 so that it is routed to the same DH 30-1,..., 30-i.

(2) Diversity Handover Processing Apparatus Next, the diversity handover processing apparatus (DH) 30 of the present invention will be described in detail. As an example, first, a DH 30 using an address chain type common buffer switch and then a DH 30 using an address FIFO type common buffer switch will be described.

The DH 30-1 of the present invention uses a common buffer switch. First, the common buffer system will be described. In the common buffer method, unlike the individual buffer method, each queue length is not fixed.
Therefore, for example, the voice for 20 ms is transmitted to the N-ISDN
For example, if the audio signal for 80 ms is accumulated and then read, the individual buffer method will set all queue lengths to 80 m.
It is necessary to set so as to be able to accumulate s or to set a queue length for each call and secure memory resources for that. When securing queues for all 80 ms, a very large amount of memory is required, and when setting the queue length for each call, each queue length must be set dynamically. Control becomes complicated. on the other hand,
In the common buffer method, the N-IS
It is not necessary to set the queue length even for the DN queue, and if the input is random traffic, a memory sharing effect can be expected, and the buffer amount can be smaller than in the individual buffer system. In this example, transmission of a voice signal by N-ISDN has been described. However, a similar memory sharing effect can be expected for a variable-length signal such as a packet.
Also, by adopting a common buffer memory, one AT
A burst having a length exceeding M cells can be dealt with by dynamically allocating a memory. Further, when a plurality of cells are accumulated and treated as one burst and transferred, the assignment can be dealt with similarly. .

Next, the specific configuration and operation of the diversity handover processing unit (DH) 30 will be described. The common buffer memory unit 301 of the DH 30-1 and a part controlling the common buffer memory unit 301 are disclosed in, for example, Japanese Patent Publication No. 2569.
No. 118 "Switching system and its configuration method",
JP-A-6-120974 "Common buffer type A with copy function"
A configuration excluding a multiplexer and a demultiplexer from the common buffer type ATM switch described in "TM Switch and Copy Method Thereof" can be used.

FIG. 5 is an example of a block diagram of a diversity handover processing apparatus (DH) 30-1 using an address chain type common buffer switch according to the present invention.

The diversity handover processing unit (DH) 30-1 includes a common buffer memory unit 301 for storing input ATM cells,
A combining / copy processing unit 302 for performing selective combining or copying of M cells, a connection selection decoder 303 for analyzing an input destination signal of an ATM cell, and a write address register for storing a write address of an ATM cell for each connection ( WAR) 304-1, ...
, 304-P, read address registers (RAR) 305-1,..., 305-P for storing ATM cell read addresses for each connection, and storing unused addresses in the common buffer memory unit 301. Empty address buffer 306, read address register (RAR) 305- based on the designated connection number
1,... 305-P, a connection selection decoder 307 for designating each connection,
The combining / copy information table 309 having information for copying, the information contained in the combining / copy information table 309 is read in accordance with the timing from the CP 60, and the corresponding ATM cell is stored in the common buffer memory unit 3 according to the information.
01, a combining / copy control unit 308 for giving a processing instruction, and a buffer capacity table 3010 for managing the number of blocks composed of a plurality of ATM cells stored in the common buffer memory unit 301. The empty address buffer 306 stores a FIFO (First in-First o
ut) may be used, or an appropriate buffer or the like which can be accessed at random may be used. Also, CP6
0 is provided with a conversion table between the wireless terminal name and the terminal local ID, and the terminal local ID converted instead of the wireless terminal name.
Using D, the processing may be executed as appropriate, or the terminal local ID may be stored in a storage table such as the combination / copy information table 309 or the buffer capacity table 3010.

D from ATM switch (ATMSW) 10
In the ATM cell input to H30-1, each terminal MS can be identified by the destination information as described above, and each destination information corresponds to the connection in DH30-1,
The data is written in the common buffer memory unit 301 so as to be managed for each connection. At the time of diversity handover, ATM cells having a plurality of different destination information arrive from the same terminal MS, and these are also managed for each destination information. Then, the ATM cell corresponding to the connection specified on the reading side is read, and the ATM cell is selected without performing the selective combining process, the copying process, or these processes.
Transferred to MSW10. How the read ATM cell is processed is determined by the combination / copy information table 309.
According to the information in In some cases, a single block is formed by a plurality of ATM cells, and a burst process is required for each block. It is managed in the table 309. The information stored in the combining / copy information table 309 includes a wireless terminal name and a connection number for combining as shown in FIG. 9, and a wireless terminal name and a connecting number as shown in FIG.
There is a connection number.

Here, a configuration for writing and reading will be described in relation to the common buffer memory unit 301. First, a write operation to the common buffer memory unit 301 will be described. A input from ATMSW10
When the destination information of the TM cell is
3, the connection number to be stored is obtained, and the corresponding write address register WAR3
04-1, ..., 304-P is selected,
According to this, a write address is obtained. This write address is input in advance from the empty address buffer 306. ATM using this write address
The cells are written to the common buffer memory unit 301. At this time, an address is read from the empty address buffer 306, and this address is written into the common buffer memory unit 301 together with the above-mentioned ATM cell. Further, the address read from the empty address buffer 306 is stored in the previously selected write address register (WA).
R) 304. The reason for writing together with the ATM cell is to indicate the storage address of the next ATM cell in the same connection of the ATM cell. In the read operation, when this ATM cell is read, the address is read at the same time. However, the read address here indicates the address of the next ATM cell in the same connection, and this address is used in the next read. Is read out. By reading the ATM cells indicated by the sequentially read addresses in this manner, the ATM cells in the same connection are read continuously.

Next, a read operation from the common buffer memory unit 301 will be described. Reading of ATM cells
The combination / copy control unit 308 causes the connection selection decoder 307 to read the address register RAR305-
, 305-P, the read address is obtained, and the read address is used as the read address of the common buffer memory unit 301 to read the ATM cell.
The address used as the read address is sent to the empty address buffer 306, and is used again as a write address. The address read at the same time as the ATM cell is stored in the read address register (RAR) 305 selected as described above. As described in the above write operation, the address indicated by the read address register (RAR) 305 next points to the next ATM cell in the same connection.

By such address control, the number of ATM cells that can be stored by one connection in the common buffer memory unit 301 is not limited.
The number of stored ATM cells corresponds without requiring designation from 60, and the common buffer memory unit 301 can be used more effectively. As an address management method, there is also a method using an address FIFO group as described in Japanese Patent Publication No. 2569118 “switching system and its configuration method”, and this method will be described later with reference to FIG.

The synthesizing / copying control unit 308 controls the CP
The counter is operated based on the timing signal from 60, and the information of the combination / copy information table 309 is read according to the value of the counter. Further, the buffer capacity table 3010 is controlled at the time of writing and reading of the ATM cell.

The buffer capacity table 3010 manages the number of ATM cells stored in the common buffer memory unit 301 and the number of blocks composed of a plurality of ATM cells for each connection, and is used when call connection or handover is performed. And a table that can be rewritten from the CP 60 upon deletion. The buffer capacity table 3010 stores, for each connection, service types such as a service that needs to be read in bursts in units of interleaving, a service that does not perform interleaving, and a service that has an indefinite packet length but requires burst reading. Have been. This service type is rewritten when a call is connected from the CP 60 or when a handover is added or deleted. When an ATM cell arrives at the DH 30-1 from the ATM SW 10, the ATM cell is input to the combining / copy control unit 308, and the service indicated by the connection number corresponding to the destination information is read from the buffer capacity table 3010. When this service indicates, for example, that interleaving is not to be performed, it is not necessary to consider blocks of a plurality of ATM cells, and the number of ATM cells managed in the table can be increased according to the number of ATM cells to be written. I just need. If the service requires burst reading in units of interleaved blocks, the number of blocks managed in the table may be increased only when an ATM cell indicating the end of the block arrives. Furthermore, if the packet length is indefinite but the service requires burst reading, the number of blocks managed in the table may be increased only when an ATM cell indicating the end of the packet arrives. When an ATM cell is read or read in units of a block, that amount is subtracted from the number of ATM cells or the number of blocks of the target connection in the buffer capacity table 3010.

The combining / copy information table 309 is a table that can be rewritten by the CP 60 when a call is connected or when a handover is added or deleted. In the diversity handover processing device (DH) 30, the GW 1
This indicates which process should be performed on the connection to be processed in order to process the signal to the BS and the signal from the GW 1 to the BS. In FIG. 20, which will be described later, the GW is transmitted from the BS to the GW.
21, the signal processing from GW1 to BS
An example is shown with respect to the signal processing to. If the signal from BS to GW1 is processed, diversity
Whether or not to perform selective combining of handover is registered in the combining / copy information table 309. When performing selective combining, two or more target connection numbers are registered. When not performing selective combining, one connection is registered. Further, one block may be formed by a plurality of ATM cells, and the block may be read out in a unit of a block. In order to manage the number of blocks stored in the common buffer memory unit 301, the service of the target connection is registered. Have been. For example, a service that needs to be read in bursts in units of interleaving, a service that does not perform interleaving, and a service that requires an indefinite packet length but burst reading are used. Further, new destination information to be replaced after the selective combining is registered. This destination information is used even when selective combining is not performed.

In the communication network control system (GW) 1, the BS
At the time of selective addition of diversity handover on the GW1 side, the destination information is registered from the CP 60 to the ATMIF 20 for the connection of the handover destination to be added. At this time, the destination is determined to be transferred to the same DH 30 as the handover source. At this time, the information of the number of the unused connection in the target DH 30 is also registered. In the composition / copy information table 309,
Although the connection of the handover source has already been added, the connection of the handover destination assigned as described above is additionally registered, and the registration of the selective combining process is registered. Conversely, the reverse is performed when the selective combining of the diversity handover is deleted. On the other hand, at the time of adding a copy of diversity handover from the GW 1 to the BS, the GW 1 adds destination information for the added copy to the combining / copy information table 309 in which the target connection is registered in the DH 30.
When deleting, the reverse is performed.

The control device (CP) 60 transfers the timing controlled between the devices to the combining / copy control unit 308. Based on this timing, the combining / copy control unit 308
To operate each counter and read out each processing item of the synthesis / copy information table 309 based on the value of the counter,
Therefore, by reading the data of the specified connection, the DH 30-1 can read the data of the specified connection at a time obtained by adding a time lag of the counter to the timing given from the CP 60. If the timing given from the CP 60 is the same as the frame period in the wireless section, the time when the signal of a certain connection is read out by the DH 30-1 is the time obtained by adding a time lag to the time of the frame break. Can be the same as the frame period.

FIG. 6 is an example of a block diagram of a diversity handover processor (DH) 30-1 using an address FIFO type common buffer switch according to the present invention. As this common buffer switch configuration, for example, the one disclosed in Japanese Patent Publication No. 2569118 “Switching System and Configuration Method” can be used.

The diversity handover processing unit (DH) 30-1 includes a common buffer memory unit 301 for storing input ATM cells,
A combining / copy processing unit 302 for performing selective combining or copying of M cells, a connection selecting decoder 303 for analyzing an input destination signal of an ATM cell, and an address FIFO 3011-1 for storing an ATM cell read address for each connection. , ..., 3011-P,
An empty address buffer 306 for storing unused addresses in the common buffer memory unit 301, an address FIFO 3011-1 based on a specified connection number,.
, A connection selection decoder 307 for designating 3011-P, a synthesis / copy information table 3 having information for synthesis / copy processing for each connection
09, the synthesizing / copy information table 309 is read in accordance with the timing from the CP 60, and the corresponding ATM cell is read out according to this, and the synthesizing / copying
The copy control unit 308 includes a buffer capacity table 3010 for managing the number of blocks composed of a plurality of ATM cells stored in the common buffer memory unit 301.

The above-mentioned address chain type common buffer switch configuration includes an address FIFO 3011-1,.
, 3011-P are different, and other configurations and operations are the same. In this DH30-1, ATMSW
When one ATM cell is input from 10, one address is read from the empty address buffer 306, and when the input ATM cell is stored in the common buffer memory unit 301, it is stored at the position indicated by the read address. Also,
Analyze the connection indicated by the additional header of the ATM cell,
Address FIFO 3011 corresponding to the connection
Then, the read address is input. As a result, if an ATM cell is read from the common buffer memory unit 301 according to the address read from the address FIFO 3011, the ATM cell of the connection corresponding to the ATM cell can be read.

(3) Base station BS and communication network control system G
Signal Processing for DH 30-1 Between W1 Here, signal processing between these BS and GW1 will be described. First, a case of processing a signal from the BS to the GW 1 will be described. When performing selective combining, signals of a plurality of target connections are transferred from the common buffer memory unit 301 to the combining / copy processing unit 302. The quality information written in the read ATM cells of the plurality of connections is compared, and new destination information is added to the highest quality one, and then output to the ATMSW 10. At this time, those of poor quality are discarded.

If no interleaving is performed,
Only one ATM cell is read from the target connection, and the selective combining process is performed. If the service needs to be read out in bursts in units of interleaved blocks, one block composed of a plurality of ATM cells is read out and subjected to selective combining processing. In this case, there is a method of performing selection and combining in units of ATM cells and a method of performing selection in units of blocks to be read. Even if the service has a variable packet length but requires burst reading, the same processing as the service for performing interleaving may be performed. However, the end position of the packet is detected by the combining / copy processing unit 302 and
The completion of reading for the packet is transferred to the combining / copy control unit 308, and control is performed to stop reading from the target connection at that time. Until now one ATM
The case where data in one radio frame section is stored in a cell has been described. However, when data in one radio frame section extends over a plurality of ATM cells, processing is performed in the same manner as described above. That is, for example, in the case of a service that does not perform interleaving, a plurality of ATM cells are read,
What is necessary is just to perform a process collectively based on one quality information contained in those ATM cells. The number of ATM cells spanning one radio frame section is indicated by the combination / copy information table 309 and the buffer capacity table 3010 from the CP 60, or detected by the combining / copy processing unit at the time of reading. There is a way.

When it is sufficient to read one signal per connection during one frame period of the wireless section, the signal may be read at a time obtained by adding an offset to the timing from the CP 60 as described above. As described above, when reading is performed in interleaved block units or when reading is performed using a plurality of ATM cells, reading is performed when a plurality of ATM cells are accumulated.

FIG. 7 shows an example in which a block unit or a plurality of ATM cells are read. FIG. 7 shows an example in which the operation for a certain connection is extracted and diversity handover is not performed.

The ATM switch (ATMSW) 10 to D
When the ATM cell arrives at H30-1, it is composed /
The data is transferred to the copy control unit 308, and the destination information is analyzed. The buffer capacity table 3010 is read with respect to the connection indicated by the destination information, and a service in the connection is searched. Although the format of the bit indicating the end of the block differs depending on the service, it is determined according to the service read here whether or not the block is the end.
It is determined that the number of storage blocks in the table has not increased, and the value of the buffer capacity table 3010 is not updated. However, some services can distinguish the beginning, middle, and end of a block, and some are managed by a sequence number. For such a case, the "first", "middle", "last" And the sequence number is updated in the buffer capacity table 3010.
This is used, for example, when a signal indicating “final” is lost in the transmission path.

FIG. 7 shows that the number of cells in the buffer capacity table 3010 is not updated at the arrival of the block but not at the end, that is, at the middle of the block (sequence 81). After that, when the combination / copy information table 309 is searched according to the value of the counter controlled at the timing of the CP 60, if the target connection number is read out here, the combination / copy control unit 308 sets the buffer capacity table 3010 Search for the number of blocks stored in the target connection in (8)
2). At this time, no ATM cell is read from the common buffer memory unit 301 because no block is stored. Sequences 83 and 84 are the same. After that, when there is a final block arrival (sequence 85), which is the last block, the number of cells in the buffer capacity table 3010 is updated after the analysis in the same manner as described above, and the number of stored blocks is increased by one. After that, if it is confirmed that one block is stored in the search of the number of stored blocks (sequence 86), the combining / copy control unit 308 reads one block composed of a plurality of ATM cells from the common buffer memory unit 301. It instructs the connection selection decoder 307 to read the minutes. At this time, since the data is continuously read from the target connection, in the read instruction for one block (sequence 87), the same connection number is specified by the number of ATM cells to be read. After the reading, the number of stored blocks is reduced by one. Therefore, the block reading is completed (sequence 88), and the number of stored blocks in the buffer capacity table 3010 is reduced by one. After these reading processes, the combining / copy processing unit 302 rewrites the new destination information read from the combining / copy information table 309 and transfers it to the ATMSW 10.

In this example, a case where no diversity handover is performed is shown. During a diversity handover, the search for the number of stored blocks must be performed for a plurality of connections. At this time, there are an example of a method of performing reading only when blocks are stored in all target connections, and a method of performing reading when block storage is confirmed in some of the target connections.

Next, the case of processing a signal from the GW 1 to the BS will be described. GW from CP60 to target area
When there is an instruction to process a signal from 1 to the BS, the combining / copy information table 309 is referred to. In the combination / copy information table 309, whether or not to perform the diversity handover copy next is registered. When copying, new destination information to be replaced after copying is registered for the number of copies. Also,
The number of data stored in the common buffer memory unit 301 is managed in a buffer capacity table 3010, and is read when an ATM cell exists.

When copying is performed, the signal of the target connection is transferred from the common buffer memory unit 301 to the combining / copy processing unit 302. The read ATM cells for the connection are copied, destination information is added to each of them, and the ATM cells are transferred to the ATMSW 10. Although the case where one wireless data unit is stored in one ATM cell has been described, the copying process is similarly performed when one wireless data unit extends over a plurality of ATM cells. However, since the BS requires one data unit for one frame time of the wireless section, a plurality of ATs are required when transferring to the BS side.
Read and copy M cells. The number of ATM cells covered by one wireless data is indicated from the CP 60 in the combining / copy information table 309 and the buffer capacity table 3010, or the combining / copy processing unit 3
02, etc. at the time of reading. After these reading processes, the combining / copy processing unit 302
The header of the ATM cell to be copied to the new destination information, which has already been read from the combining / copy information table 309, is rewritten and transferred to the ATMSW 10.

Here, the data transfer of the following blocks will be described with a specific example. 1) When the block is divided into "first", "middle" and "last" 2) When one packet is too large to fit in one cell

In the following, the wireless communication is performed by, for example, 10 m
The description will be made on the assumption that data of the CPS packet is transferred every second. First, with regard to 1), this means that when transmitting a signal that forms one block in 80 ms, for example, the “first” is sent to the CPS packet sent in the first 10 ms and sent between 20 ms and 70 ms. CP
The S packet is provided with an identifier of “intermediate”, and the CPS packet transmitted at the end of the last 80 ms is provided with an identifier of “last”. As a result, on the receiving side of the CPS packet,
It is possible to assemble one block by using eight CPS packets from the “first” to the “last”. The quality information for performing selective synthesis is C
Since it is provided for each PS packet, it is sufficient to perform the processing at the time of selective combining without particularly being aware of a block of 80 ms. (However, in order to omit the selective combining process, a method may be adopted in which the determination is made based on only the “first” CPS packet, and the subsequent seven read CPS packets use the determination result as it is.)

Next, regarding 2), the length of one CPS packet in the section of 10 ms is one ATM.
When the CPS packet exceeds the cell payload, it is necessary to divide this CPS packet, pack it into ATM cells and transfer it. For example, when the data transfer rate is 64 kbit / s, 10 m
640 bits per second, that is, the payload of one CPS packet has a length of 80 bytes (= 640 bits).
In such a case, CPS generated every 10 ms
In order to transfer a packet, it is necessary to transfer the packet using two ATM cells. (The reason for this is that the ATM cell payload is 48 bytes, but because it is used for several bytes for AAL type 2, it is not possible to use the entire 48 bytes. Also, 64 kbit / s was taken as an example. , This is just the transfer amount between BS and GW,
I'm not talking about landlines. )

Since one piece of quality information in the radio section is added to one CPS packet, two ATs are added as described above.
When divided into M cells, it is generally added to the CPS packet data included in the first ATM cell.
Therefore, at the time of selective combining, two cells are read out from the target connection at a time, quality information given to the first ATM cell in each connection is compared, and the connection having the best quality is determined. Control is performed to transfer data for two cells to the subsequent stage.

The same applies to the case of copying an ATM cell. First, two cells are read from one target connection, then copied, and an additional header is added to them. In the above-described example, division into two cells is described, but division into three or more cells may be considered. When divided in this way, each ATM cell has a "first"
Since identifiers such as "middle" and "last" are attached, 1
One CPS packet can be assembled.

As described above, different services coexist,
Even if the buffer capacity for absorbing the burst differs for each connection, the DH 30-1 flexibly responds and does not require a useless buffer. Furthermore, since the connection can be freely set in the common buffer memory unit 301, it is possible to flexibly cope with a change in the connection ratio between the signal on the GW1 side from the BS and the signal in the opposite direction.
Even if the ratio of one-way communication from the GW 1 to the BS side increases as in the case of file download by IP, it is possible to flexibly cope with the increase. Therefore, it is possible to easily cope with various services such as multimedia, and to easily perform interconnection with other networks.

(4) Operation when the wireless terminal MS moves in each zone The following is the GW when the wireless terminal MS moves in each zone.
1 and the specific processing in the DH 30 will be described. In addition,
In the following description, as an example, DH3 using an address FIFO type common buffer switch as shown in FIG.
Although a description will be given with respect to 0-1, the same processing can be executed in the DH 30-1 using the address chain type common buffer switch in FIG.

First, the upstream signal path from the radio terminal MS to the GW 1 and processing will be described. FIG. 8 is an explanatory diagram of the upstream signal path of the GW 1 when the wireless terminal MS moves. This figure shows that the wireless terminal MS (a) has BS
(A), a state communicating with both the BS (B), that is, a state performing a handover, and the radio terminal MS
(B) is a state of communicating with BS (C). MS
In order for the DH 30-1 to perform the handover process on the uplink signal of (a), the DH 30-1 buffers the signals via the BS (A) and BS (B) once, and then transfers these signals. The quality information is read and compared, and only quality data is transferred to the ATM communication network. Therefore, in order to facilitate buffering in the DH 30-1, the ATMIFs 20-1-1, 20-1-2, 20-
At 1-3, an additional header is added to the ATM cell. Specifically, the signal of the MS (a) via the BS (A) (assuming that the identifier "Aa" is assigned to the signal) is ATMI.
In F20-1-1, "I" is added as an additional header. The CP 60 transmits such additional header information to each AT.
Write to the conversion tables of the MIFs 20-1-1, 20-1-2, and 20-1-3. Similarly, MS via BS (B)
The signal (a) (assuming that the identifier "Ba" is added to this signal) is given "II" as an additional header by the ATMIF 20-1-2. The ATMIF 20-1-3 adds "III" to the signal of the MS (b) via the BS (C) (assuming that the signal is provided with the identifier "Cb") in the ATMIF 20-1-3. . Each ATMIF
By matching the value of the additional header given by the above with the connection number of the DH 30-1, the DH 30-1 may perform buffering according to the value of this additional header.

FIG. 9 shows D when mobile terminal MS moves.
FIG. 3 is an explanatory diagram of upstream signal processing of H30-1. In this figure, in the diversity handover processing device using the address FIFO type common buffer switch configuration,
7 specifically shows the state of a memory and a table inside the DH 30-1 as shown in FIG. In the common buffer memory unit 301, ATM cells are stored at the address indicated by the empty address buffer 306 (FIG. 9).
Then, the addresses from “1” to “7” of the common buffer memory unit 301. ). First, it is assumed that the address “1” is read from the empty address buffer 306 when the ATM cell indicated by the identifier Aa is input. At this time, the input ATM cell is stored at the address “1” of the common buffer memory unit 301. By the way, if this identifier is Aa
Since "I" is added as an additional header to the ATM cell as shown in FIG. 8, the information of address "1" is stored in the address FIFO 3011-1.
Similarly, the ATM cell having the identifier Ba has the address “2”.
Since the header of this is "II", the information of address "2" is stored in the address FIFO 301.
Store in 1-2.

By the way, the signal having the identifier Aa and the signal having the identifier Ba are originally signals of the radio terminal MS (a), and these signals are to be subjected to the selective combining process.
The selective combining is performed based on the setting information in the combining / copy information table 309 from the CP 60. Here, a signal having the additional header “I” and the additional header “II” is a target for selective combining, and this is set in the combining / copy information table 309. Here, additional headers "I" and "I"
Since the signal having "I" is buffered at the connection numbers "I" and "II" in the DH 30-1, it indicates that the connection numbers "I" and "II" are to be selectively combined. 9, FIG. 9 and the following similar drawings, only the table for selection / combination with respect to the combination / copy information table 309 is illustrated to explain the selection / combination. The buffer capacity table 3010 includes, for example, a connection number for each connection number.
The number of cells stored in the address FIFO 3011 is stored. Since the cells after the processing by the combining / copy processing unit 302 have different transfer destinations, an ATM header or a new header is added to the ATM cells here. Therefore, these header information are actually stored in the combining / copy information table 309, but are omitted in FIG.

The combining / copy control unit 308 sequentially reads the combining / copy information table 309 for selection and combining. When the wireless terminal reads MS (a), it reads "I" and "II" as combined connection numbers.
It is shown. This is because the connection numbers "I" and "
II "indicates that the signal is to be selectively combined. Therefore, a signal is read out from the connection numbers" I "and" II "one cell at a time, and the combining / copy processing unit 302 sends the signal with the better quality information to the ATMSW 10. At this time, first, the address FIFO 30 of the connection number "I" is transferred.
When the address is read from 11-1, it indicates "1".
Is read out from the address FIFO 3011-2 of the connection number “II”, and the address is read out from the address FIFO 3011-2 of the connection number “II”.
Read M cells. The quality of the ATM cells thus read is compared. Similarly, composite / copy information table 3
As the wireless terminal reads MS (b) when reading the table for selective combining at 09, at this time the connection number is registered as only "III", and the combining / copy processing unit 302 , Without selective synthesis,
The cell read out in the same manner as described above is
Transferred to Further, the capacity of each buffer is monitored by the buffer capacity table 3010, and when the capacity is smaller than a certain threshold value, it is possible to perform control such as prohibiting reading.

Next, FIG. 10 is an explanatory diagram of the uplink signal processing by the diversity handover processing device when the radio terminal MS moves. In this figure, in FIG.
Address “1”, “1” of the common buffer memory unit 301
2 "and" 3 "were read out, and then the wireless terminal M
S indicates a state in which three cells have been written without moving. Since the cells at addresses "1", "2", and "3" have been read, there are no ATM cells at these addresses. Therefore, these pieces of address information are stored in the empty address buffer 306. When an ATM cell having an identifier Ba is input and the read address from the empty address buffer 306 is "8", this cell is stored at the address "8" in the same manner as described above. Further, the information of the address “8” is stored in the address FIFO 3011-2 of “II” indicated by the additional header.

FIG. 11 is an explanatory diagram of the upstream signal path of the GW 1 when the radio terminal MS moves. FIG.
FIG. 3 shows an explanatory diagram of uplink signal processing by the diversity handover processing device when the wireless terminal MS moves. These figures show that the wireless terminal MS (a) moves and B
This shows a state in which communication is being performed with all of S (A), BS (B), and BS (C). This is BS
This means that the signal of MS (a) via (C) is added. At this time, a state is shown in which “IV”, which is an empty connection of the DH 30-1, is allocated. B
Assuming that the identifier Ca is given to the signal of the MS (a) via the S (C), the ATMIF 20-1-3 has the identifier Ca
Is set by the CP 60 to add an additional header "IV" to the. The address “1” is added to the address FIFO 3011-4 corresponding to the connection number “IV”.
1 ”and“ 14 ”are stored. At this time, the address“ 1 ”of the common buffer memory unit 301 is stored.
The signal of the identifier Ca is stored in “1” and “14.” Further, the signal of the connection number “IV” is a signal from the wireless terminal MS (a), and the signal of the connection number “IV”.
Therefore, the combination / copy information table 30 indicates that the connection numbers “I”, “II”, and “IV” are to be selectively combined together with “I” and “II”.
As shown in FIG.

FIG. 13 is an explanatory diagram of the upstream signal path of the GW 1 when the radio terminal MS moves. FIG.
FIG. 3 shows an explanatory diagram of uplink signal processing by the diversity handover processing device when the wireless terminal MS moves. These figures show the wireless terminals MS (a), MS (b)
Shows that they have moved further. Wireless terminal MS
(A) disconnects the communication with the BS (A) and disconnects the BS (B);
Communicating only with BS (C). Wireless terminal MS (b)
Adds communication with BS (A) and adds BS (A), BS (C)
Communicating with For the MS (a), the CP 60 instructs to delete the entry of the identifier Aa from the table of the ATMIF 20-1-1 in order to delete the communication. Therefore, the signal of the identifier Aa of the address “13” is deleted, and the connection number “I” is deleted from the column of MS (a) in the combining / copy information table 309. At this time, "V" is not used as the connection of the DH 30-1, and the MS (b) adds the additional header "V" to the identifier Ab in order to add the communication with the MS (A). It is set in ATMIF 20-1-1 so as to be given. For the identifier Ab, the addresses “15” and “4” are used, and the connection number “V” is added to the MS / b column of the combining / copy information table 309. In addition, it can be seen that the signal of another connection is stored because, for example, the portion of the address “1” used earlier becomes empty. Here, the signal of the connection number “IV” for the identifier Ca is stored at the address “1”.

Next, FIG. 15 shows an explanatory diagram of the upstream signal path of the communication network control system GW1 when the radio terminal MS moves. FIG. 16 shows a diversity handover processing device (DH) 3 when a wireless terminal moves.
FIG. 4 is an explanatory diagram of 0-1 uplink signal processing. In these figures, MS (b) is BS (A), BS (B), BS
(C), while MS (a) communicates with the BS
(C) shows a state of communication. In this case as well, the same settings are made for the ATMIFs 20-1-1 to 20-3 as described above. In the combining / copy information table 309, the connection number "II" in the column of MS (a) is deleted, and the addresses "3" and "10" become empty. Also,
The connection number “I” is added to the column of MS (b), and ATM cells are stored at addresses “6” and “13”. Also, the connection number “I” is used for MS (A) in the case shown in FIGS.
When this connection is released, it can be used for MS (B) as shown in this figure.

As described above, in the common buffer memory,
Thus, the memory area can be used freely and dynamically.

Next, the downstream signal path from the GW 1 to the wireless terminal and the processing will be described. FIG. 17 is an explanatory diagram of the downstream signal path of the GW 1 when the wireless terminal MS moves. This diagram is a diagram showing a signal flow for the copy process on the downstream side. MS (a) is BS
(B), communicating with BS (C), while MS (b)
Is communicating with BS (A) and BS (C),
From 1 it is necessary to transfer signals to these. Therefore, in the DH 30-1, the ATM communication network 100 (2)
Copy the signals to S (a) and MS (b) as many times as necessary,
It transmits to BS (A), BS (B), and BS (C), respectively. Each BS (B) and BS (C) are connected to DH30-1 through A
TMSW10 and ATMIF 20-1-2, 20-1-
The signal transferred through the step 3 is wirelessly transmitted to the MS (a). Similarly, the signals of BS (A) and BS (C) are MS (b)
Sent to.

(5) Operation at the time of selection / combining Next, the operation at the time of selective combining on the up side will be described. FIG. 22 is an explanatory diagram of the flow of processing at the time of diversity handover. First, the wireless terminal 22-
1 converts the information such as voice into an air packet 22-3 and transmits it to the radio base station 22-2. In particular, in the case of voice, the air packet 22-3 is a CPS packet. The radio base station 22-2 transmits the air packet 22-
When the packet No. 3 is received, the reception quality information 2200 of the air packet 22-3 is added, and the packet is combined with the packet from another wireless terminal and stored in the payload of one ATM cell 1300-1. This is to improve the line efficiency between the wireless base station and the GW. Next, the wireless base station 22-2
Transfers the ATM cell 1300-1 to the GW 1-1. Upon receiving the ATM cell 1300-1, the GW 1-1 receives the ATM cell 1300 in the ATMIF 20-1.
-1 is decomposed into packets, and one ATM cell 1301-1 is generated for each air packet. Subsequently, in the DH 30-1, the common buffer memory unit 30
1. The combining / copy control unit 308 reads out the air packets to be diversity-combined with timing and transfers the packets to the combining / copy processing unit 302. The combining / copy processing unit 302 evaluates the quality based on the quality information added to the air packet, selects the ATM cell 1301-1 storing the high quality packet, and removes the other low quality packet from the ATM cell 1301-1. ATM cell 1301 stored
-3 etc. are discarded. Finally, in the ATMIF unit 20-2,
The air packets having the same destination A are collectively stored in one ATM cell 1305-1 and transferred. In this way, diversity combining is possible. FIG. 18 is an explanatory diagram of each signal header at the time of uplink selective combining. Here, the wireless terminals MS (a), MS (b), MS (c), M
It is assumed that S (d) is in a handover state as illustrated. Since a signal from each wireless terminal MS, for example, in the case of a voice system, one voice packet is shorter than an ATM cell (when the signal rate is 8 kbit / s and voice packets are generated every 10 milliseconds, There is a method of multiplexing and transferring a plurality of voice packets to ATM cells.
As this method, there is AAL type 2 defined in ITU-T. For example, in BS (A), the wireless terminal MS
(A), a state in which voice packets (CPS packets) generated by MS (b) and MS (d) are multiplexed into ATM cells. Then, in the ATM cell 1300-1,
The ATM header 1400-1 is "A", and in this one cell, the CPS packet header "a", "
CPS packet 150 having b "and" c "respectively
1, 1502 and 1503 are included.

FIG. 19 is an explanatory diagram of each processing table and data format on the BS side in the GW1. In this figure, the ATMIFs 20-1-1 to 2-1-2 accommodating each BS are shown.
0-1-3 processing table and ATMIF2
The data format after passing through 0-1-1 to 20-1-3 is shown. ATMIF 20-1-1 to 20-1-3
Has each processing table as shown in the figure, and this processing table is set by the CP 60 when a call connection, disconnection, or handover is added or deleted. It should be noted that the table shown in this figure shows only the table for uplink processing. The input fields in the tables of the ATMIFs 20-1-1 to 20-1-3 indicate the value of the ATM cell header which has transferred the input CPS packet and the CPS packet header, and the output field is the input field. ATM cell (ATMSW) additional header of the ATM cell generated when a CPS packet as shown in FIG.
2 shows an additional header for a handover processing device (DH). In the ATMSW 10, switching is performed using only the ATMSW additional header. A plurality of Ds as shown in this figure
In a system configured with H30-1 and H30-2, signals of the same wireless terminal MS need to be transferred to the same DH30-1 (Q) or DH30-2 (R). For this purpose, switching is performed by the ATMSW additional header. The data format of the signal transmitted from the ATMIFs 20-1-1 to 20-1-3 to the ATMSW 10 includes an ATMSW additional header 1401-1 indicating a DH number and a DH additional header 1402 indicating a connection number, as shown in FIG. -1 and an ATM cell 1301-1.

FIG. 20 shows DH30-1 in GW1,
FIG. 3 is an explanatory diagram of each processing table and each data format on the 30-2 side. This figure shows a state after switching in GW1. In each of the DHs 30-1 and 30-2, buffering for each connection is performed using the DH additional header. When a new connection is added, it is only necessary to specify a free connection number. Whether or not a handover is to be performed is indicated by the combination / copy information table 309 (note that only a table on the selection / combination side is shown in FIG. (The replacement header is on the right side of the table, but is not shown here.) In this figure, the ATM cell of the DH additional header "Q" is transmitted to the DH30-1 (Q), and the ATM cell of the DH additional header "R" is transmitted to the DH30-1 (Q).
-2 (R). Further, for example, in the combining / copy information table 309-1, the connection number, the connection number,
The terminal name is stored correspondingly.

FIG. 21 shows an example of an explanatory diagram of the copy processing of the downstream signal. Here, the wireless terminal MS
(A), the downstream signal of MS (b) is DH30-1 (Q)
Are stored in the connection numbers “VI” and “VII” of FIG. For example, MS (a) is shown to be copied in three, and is instructed to add A and α, B and α, and C and γ as additional headers respectively. The value of this combination / copy information table 309 is C
This is set from P60 (the combining / copy information table 309 in FIG. 21 shows only the downstream side).

[0087]

According to the present invention, integration or interconnection of existing communication networks can be realized as described above. Further, according to the present invention, it is possible to provide a GW suitable for configuring a communication network for realizing integration or interconnection of existing communication networks and a control method thereof with a simple configuration and procedure.

According to the present invention, for example, while existing communication networks are left as they are, the existing communication networks are connected to each other so as to make full use of the communication capabilities and services provided originally by the communication networks. Performs necessary signal conversion, exchange or control processing to implement interconnection and communication service provision, and provides information from the terminals of each existing communication network to the desired destination and to the desired medium when desired GW to do
And its control method can be provided with a simple configuration and procedure.

According to the present invention, the GW realizes a communication service for interworking with heterogeneous networks such as an STM communication network, an ATM communication network, and the Internet.
There is no need to be aware of the control method specific to the opposing network,
It is possible to provide a GW that only needs to be aware of a control method as a single interface device and a control method thereof.

According to the present invention, it is possible to easily add or change each block of a signal processing device or the like, or to add a new communication network interface. A GW for interconnecting networks can be easily provided.

According to the present invention, the DH employs a common buffer that can be used without being aware of the difference in required buffer capacity for each connection due to the difference in media, so that various media can be connected to the wireless communication network. And complicated control is not required. Furthermore, since the buffer is shared by each connection, the memory can be reduced, and a device which is economically advantageous can be supplied. Further, by controlling the start time of the interleave processing, the effect of the common buffer can be further enhanced. Furthermore, within the GW, only ATMs for CPS packets
According to the present invention, since the number of cells is doubled, the processing in the GW is several times as heavy as processing ATM cells in a wired line. Such a large load can be sufficiently handled by using a switch having a good common buffer memory unit. In particular, in a CDMA mobile system, it is necessary to add and delete communication paths more frequently than to a fixed telephone, and to secure a larger number of communication paths than the number of connected wireless terminals. According to the present invention,
Using a switch having a common buffer memory unit to effectively use resources inside the communication network control system,
For example, the deleted communication path resources can be used immediately and effectively.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a communication network using a communication network control system of the present invention.

FIG. 2 is a block diagram schematically showing a communication network control system according to the present invention.

FIG. 3 is a block diagram schematically showing an exchange system.

FIG. 4 is a block diagram showing a detailed configuration of a communication network control system according to the present invention.

FIG. 5 is a block diagram of a diversity handover processing device (DH) using an address chain type common buffer switch according to the present invention.

FIG. 6 is a block diagram of a diversity handover processing device (DH) using an address FIFO type common buffer switch according to the present invention.

FIG. 7 is an explanatory diagram of processing of a diversity handover processing apparatus when reading out a block unit or a plurality of ATM cells.

FIG. 8 is an explanatory diagram of an upstream signal path of a communication network control system (GW) when a wireless terminal moves.

FIG. 9 is an explanatory diagram of uplink signal processing of the diversity handover processing device (DH) when a wireless terminal moves.

FIG. 10 shows diversity when a wireless terminal moves.
FIG. 4 is an explanatory diagram of the upstream signal processing of the handover processing device (DH).

FIG. 11 is an explanatory diagram of an upstream signal path of a communication network control system (GW) when a wireless terminal moves.

FIG. 12 is a diagram illustrating diversity when a wireless terminal moves.
FIG. 4 is an explanatory diagram of the upstream signal processing of the handover processing device (DH).

FIG. 13 is an explanatory diagram of an upstream signal path of a communication network control system (GW) when a wireless terminal moves.

FIG. 14 is a diagram illustrating diversity when a wireless terminal moves.
FIG. 4 is an explanatory diagram of the upstream signal processing of the handover processing device (DH).

FIG. 15 is an explanatory diagram of an upstream signal path of a communication network control system (GW) when a wireless terminal moves.

FIG. 16 is a diagram illustrating diversity when a wireless terminal moves.
FIG. 4 is an explanatory diagram of the upstream signal processing of the handover processing device (DH).

FIG. 17 is an explanatory diagram of a downstream signal path of a communication network control system (GW) when a wireless terminal moves.

FIG. 18 is an explanatory diagram of each signal header at the time of uplink selective combining.

FIG. 19 is an explanatory diagram of each processing table and data format on the wireless terminal (BS) side in the communication network control system (GW).

FIG. 20 is an explanatory diagram of each processing table and each data format on the diversity handover processing device (DH) side in the communication network control system (GW).

FIG. 21 is an explanatory diagram of copy processing of a downstream signal.

FIG. 22 is an explanatory diagram of a processing flow at the time of diversity handover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Communication network control system (GW), 2 ... Switching system (NS), 10 ... ATM switch, 20 ... ATM communication network interface, 25 ... IP communication network interface, 40 ... Demultiplexer (MUX) 30 Diversity handover processor (D
H), 301: common buffer memory unit, 302: combining / copy processing unit, 303, 307: connection selection decoder, 304-1 to 304-P: write address register WAR, 305-1 305-P: read address register RAR, 306: empty address buffer, 308: combining / copy control unit, 309: combining / copy information table, 3010: buffer capacity table, ..Signal processing device (SIG), 60 ... Control unit, 70 ... Multimedia signal processing device (MSP), 80 ... Trunk device (TRK), 100 ... Multimedia communication network, 101. ..Mobile communication network, 102: ATM communication network, 103: IP communication network, 104: Mobile communication network, 106 ..Communication terminal, BS: base station, MS: mobile terminal.

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 5K030 GA06 GA17 HA10 HB21 HB29 HC09 HD03 HD09 JL01 JT09 KX02 LB19 MB11 5K033 AA04 BA15 CC01 DA05 DA19 DB13 5K067 BB03 BB04 CC24 DD17 DD45 EE02 EE10 HH01 HH23 JJ35 9

Claims (11)

[Claims] 1. A diversity handover processing device in a communication network control system for interconnecting a wireless communication network with another communication network, comprising: a common buffer memory unit for storing input ATM cells; , A combining / copy information table for storing correspondence with connections for combining or copying ATM cells, and combining / reading information on connections in the combining / copy information table for the target wireless terminal.
A copy control unit, a common buffer memory control unit that indicates an address of a connection read by the combining / copy control unit, and controls reading of an ATM cell at the address from the common buffer memory unit; A diversity handover processing device comprising: a synthesis / copy processing unit that synthesizes or copies ATM cells read from the unit. 2. The diversity handover processing apparatus according to claim 1, further comprising a buffer capacity table for storing a correspondence between a connection and a buffer capacity using said common buffer memory unit. apparatus. 3. The diversity device according to claim 1,
In the handover processing device, the combining / copy control unit transfers a plurality of connections for a target wireless terminal to the common buffer memory control unit, and the common buffer memory control unit transmits a plurality of connections for the plurality of transferred connections. Controlling the plurality of ATM cells to be read;
A diversity handover processing device for performing selective combining based on quality information indicated in a cell. 4. The diversity handover processing device according to claim 1, wherein the combining / copying processing unit reads the read ATM cell based on the combining / copying information table or the buffer capacity table. A plurality of ATM cells are copied.
A diversity handover processing device that controls so as to add destination information to a cell. 5. The diversity handover processing apparatus according to claim 1, wherein a plurality of packets having the same destination are included in one ATM cell and transferred. 6. The diversity handover processing device according to claim 1, wherein when a packet length to be transferred exceeds a payload length of one ATM cell, the packet is divided into a plurality of ATM cells having the same destination. A diversity handover processing device, characterized in that the device performs forwarding. 7. A communication network control system comprising a plurality of diversity handover processing apparatuses according to claim 1 for connecting a plurality of types of communication networks to transfer information. A plurality of interfaces for converting signals from a plurality of types of devices into ATM cells to which a header addressed to the desired diversity handover processing device is added; and a plurality of input lines and output lines. A diversity handover processing device, accommodating the interface,
A received on one of the input lines from the interface
An ATM switch for transferring the TM cell to any one of a plurality of output lines based on the header information of the ATM cell, wherein the diversity handover processing device adds an ATM cell with a header addressed to a desired device to the ATM cell. A communication network control system for converting and outputting the converted data to the ATM switch. 8. The communication network control system according to claim 7, further comprising a control unit for providing the diversity handover processing device with a plurality of connections to be subjected to selective combining and quality information. Communication network control system. 9. The communication network control system according to claim 7, further comprising: a control unit that provides the diversity handover processing device with a plurality of connections to be copied, information indicating the number of copies, and destination information. A communication network control system further provided. 10. A diversity combining method in a mobile communication system, comprising: a step of adding quality information of a packet for each packet;
Assembling the ATM cell of the first A;
Transmitting the first ATM cell assembled by the step of assembling the TM cell; receiving the first ATM cell transmitted by the transmitting step; and receiving the first ATM cell by the receiving step. Disassembling the cell into a plurality of packets; assembling a second ATM cell so as to include at least one packet obtained by the disassembly; and assembling the second ATM cell. Out of the obtained second ATM cells, the second ATM cell
And selecting a high-quality packet based on quality information of a packet included in the cell. 11. The diversity combining method according to claim 10, further comprising the steps of: decomposing the second ATM cell selected in the selecting step for each packet; and decomposing the second ATM cell for each packet. A packet combining destination packets for each packet having the same destination, and assembling a third ATM cell including a plurality of packets combined by the combining step.