KR20020036045A - Method for serving NDSS in mobile switch center - Google Patents

Abstract

PURPOSE: A method for servicing an NDSS(Network Directed System Selection) in a mobile communication switch is provided to enable a user to access a preferred system by classifying a 2G system subscriber and a 2.5G system subscriber and enabling the 2.5G system subscriber to perform a roaming in a 2G and making a reset message transmission to a 2.5G system with respect to a location registration receipt and an originating call of the 2.5G system subscriber possible in the 2G system. CONSTITUTION: A location registration receipt is in standby(S101). If a location registration request is received in a 2G base station or a 2G and 2.5G overlap base station, a location registration is requested to an HLR(home location register)(S102-S103). A location registration response is received from the home location register(S104). A reset message transmission flag is read(S105). The read reset message transmission flag is checked(S106). If the reset message transmission flag is set up as "TRUE" as a check result of the transmission flag, a position registration response is transmitted(S107). If the reset message transmission flag is set up as "FALSE", it is checked whether the location registration request is received in a 2G base station(S108). At the above (S102-S103) stages, if the location registration request is received in a 2G base station, the current stage is returned to the above (S107) stage. Otherwise, if the location registration request is received not in a 2G base station, reset activation information is read(S109). The read reset activation information is searched and a reset activation status or not is checked(S110). If the status is not a reset activation status, the current stage is returned to the above (S107) stage. If the status is a reset activation status, it is checked whether the location registration request is received in a 2.5G Preferred 2.5G base station(S111). If the location registration request is received not in a 2.5G Preferred 2.5G base station, the current stage is returned to the above (S107) stage. Otherwise, if the location registration request is received in a 2.5G Preferred 2.5G base station, reset message composition information is read(S112). A reset message is constituted based on the read reset message composition information(S113). A reset request message is transmitted using the constituted reset message(S114).

Description

Method for serving NDS in mobile communication switch {Method for serving NDSS in mobile switch center}

The present invention relates to a NDSS (Network Directed System Selection) service in a mobile switch center (MSC). In particular, a subscriber of a 2G system (IS-95A / B system) and a 2.5G system (IS-2000 system) The 2.5G system subscriber can roam in 2G, and the 2G system enables the subscriber to send the reset message to the 2.5G system for the 2.5G subscriber's location registration reception and call out. The present invention relates to a method of NDSS service in a mobile communication switch that can be accessed by a network.

In general, NDSS is a network function that, when a subscriber attempts to register a location in one region, the home system connects to another system in the region according to the subscriber's preferred system.

Herein, a system induced to be newly connected may be any kind of system regardless of frequency or band.

This feature encourages subscribers to register their preferred roaming system and automatically access the most appropriate system if multiple operators in the same area provide mobile phone service. That is, the NDSS function allows the terminal to connect to the system of the subscriber's preferred system by automatically accessing the system of the subscriber's preferred system without intervention of the subscriber or by directing the subscriber to access the most suitable system of the region when registering the location. do.

Here, the preferred system for each subscriber should be managed in the order determined by the subscriber in consideration of the charge policy of the system, call quality, and compatibility with the terminal owned by the subscriber.

In addition, in order to provide the NDSS function, the home system should be able to register and manage the preferred system for each region in which the subscriber roams.

On the other hand, when a plurality of mobile operators in the same area is a network, if you look at the conventional 2G system and 2.5G system, 2G system performs the service according to the IS-95A / B standard, 2.5G system is IS-2000 standard It is not possible to roam from 2G system to 2.5G system, and likewise, roaming from 2.5G system to 2G system is impossible.

Therefore, the present invention is to enable roaming from the 2G system to 2.5G system by applying the NDSS function in the mobile communication exchange, as well as roaming from 2.5G system to 2G system,

An object of the present invention is to distinguish between 2G system (IS-95A / B system) subscribers and 2.5G system (IS-2000 system) subscribers, allowing 2.5G system subscribers to roam in 2G, and 2G systems. The present invention provides a NDSS service method in a mobile communication switch that allows a subscriber to access a preferred system by allowing a 2.5G system to transmit a reset message to a 2.5G system.

The present invention for achieving the above object,

It stores and manages Preferred System (2G / 2.5G) information for each subscriber in the Home Location Register (HLR) and transmits it to the MSC / VLR in the subscriber profile during initial location registration. Allow the MSC to redirection to the lien system based on the subscriber's profile in the VLR, and after the location registration attempts at the High Speed Packet Data Service in the 2G system, the exchange determines that the 2.5G system is under the control of the MSC. Try to reconnect.

In addition, 2.5G terminal subscribers are divided into 2.5G Preferred 2.5G subscribers and 2G Preferred 2.5G subscribers according to the lien system. 2.5G Preferred 2.5G subscriber station selects 2.5G system first, and selects 2G system in areas where 2.5G system is not accessible.

In addition, 2G Preferred 2.5G subscribers can be programmed to select 2G systems and reconnect to 2.5G systems on demand for high-speed data services.

In addition, since high-speed data service is only available in 2.5G system, 2.5G Preferred 2.5G subscriber requesting high-speed data service in 2G system should be instructed to reconnect to 2.5G system. All processing related to the reconnection is performed by the service MSC.

In addition, in the initial state of the system, the terminal should select the system by distinguishing between normal initial, high-speed data service termination, and idle state transition. That is, the terminal should select a 2G or 2.5G system by distinguishing between high speed data service termination and idle state transition.

1 is a network diagram of a mobile communication system to which the present invention is applied;

2 is a flowchart illustrating a location registration process for an NDSS function service in the present invention;

3 is a flowchart illustrating an NDSS processing flow when registering a location in a mobile communication switch according to the present invention;

4 is a flowchart illustrating an NDSS service method in a mobile communication switch according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100, 950 ..... Home Location Register (HLR)

200 ..... 2G Systems

300 ..... 2.5G Systems

210, 310 ..... MSC

Hereinafter, a preferred embodiment of the present invention according to the technical spirit as described above will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a network configuration of a mobile communication system to which the present invention is applied.

Here, reference numeral 100 denotes a home location register (HLR) storing information of a terminal (mobile station), reference numeral 200 denotes a 2G system conforming to the IS-95A / B standard, and 300 denotes 2.5G conforming to the IS-2000 standard. System 400, and reference numeral 400 denotes a mobile station (terminal).

In addition, reference numeral 500 denotes an overlapping area in which both the 2G system 200 and the 2.5G system 300 can service.

The 2G system 200 includes a mobile communication exchange (MSC) 210, a plurality of control stations (BSC0, BSC1) 221 and 222 connected to the mobile communication exchange 210, and the control. A plurality of base stations (BTS0) (BTS1) 231 and 232 under the control of the station (BSC0) 221 and a plurality of base stations (BTS10) under the control of the control station (BSC1) 222 ( BTS11) 241 and 242.

The 2.5G system 300 includes a mobile communication exchange (MSC) 310, a plurality of control stations (BSC0, BSC1) 321 and 322 connected to the mobile communication exchange 310, and A plurality of base stations (BTS0) (BTS1) 331 (332) under the control of the control station (BSC0) 321, and a plurality of base stations (BTS10) under the control of the control station (BSC1) 322 (BTS11) 341 and 342.

2 is a flowchart illustrating a location registration process for an NDSS function service in the present invention.

Here, reference numeral 100 denotes the home location register (HLR), reference numeral 400 denotes the mobile station, and reference numeral 600 denotes a previous service system which was previously in charge of service of the mobile station 400, and reference numeral 700 denotes a hand. A new service system for newly providing a service to the mobile station 400 after the off, and reference numeral 800 denotes a lien service system for performing an NDSS function.

Each service system 600, 700, 800 includes a mobile communication switch and a visitor location register, respectively.

First, when transmitting location registration information from the mobile station 400 to the new service system 700, the mobile station 400 transmits shape information for distinguishing whether the current base station is a 2G service area or a 2G / 2.5G overlap area.

The new service system 700 having received the shape information requests a location registration to the home location register 100 (REGNOT).

The home location register 100, which has been requested to register the location, requests to release the location registration to the previous service system 600 (REGOAN) and receives a corresponding response (regcan).

The home location register 100 receiving the response to the location registration release transmits a location registration request response to the new service system 700, wherein the subscriber's lien right information (Preferred information: 2G subscriber / 2G Preferred 2.5). G subscriber / 2.5G Preferred 2.5G subscriber).

When the subscriber is a 2.5G Preferred 2.5G subscriber, the new service system 700 determines whether the current base station is a 2G / 2.5G overlapping area when requesting a location registration and requests a reconfiguration to the mobile station 400 (service redirection).

Receiving the reset request, the mobile station re-registers the location registration with the lien service system 800 with reference to the lien information.

From the following procedure, as in the previous location registration procedure, the lien service system 800 requests the location registration from the home location register 100, and the home location register 100 registers the location with the new service system 700. When the release request is received and the response is received, the lien service system 800 responds to the location registration request.

In other words, a new system with 2G Preferred 2.5G subscribers is reconfigured to a 2G system, which is a lien service system when initial location registration, and a new service system with 2.5G Preferred 2.5G subscribers, is a 2G system. The command is to reset the 2.5G system.

3 is a flowchart illustrating an NDSS function processing process when registering a location in a mobile communication switch according to the present invention.

Here, reference numeral 910 denotes a mobile station (MS), 920 denotes a control station (BSC), 930 denotes a mobile signaling access block (MSA), 940 denotes a location register location update (LLU) block for location update, and 950 denotes Represent each home location register 950.

When the mobile station 910 requests location registration as shown, the control station 920 transfers it to the MSA 930 in the mobile communication exchange, and the received MSA 930 is sent to the LLU 940. Require location registration.

When the LLU 940 requests location registration from the home location register 950, the home location register 950 transmits response information to the LLU 940, and the LLU 940 receives the MSA 930 from the received LLU 940. Pass the reset information to.

The MSA 930 receives the reset information and transmits the reset information to the control station 920. The control station 920 transfers the reset information to the mobile station 910 so that the mobile station 910 registers the location with the lien service system. Try again.

4 is a flowchart illustrating an NDSS service method in a mobile communication switch according to the present invention.

As shown in FIG. 3, when a location registration request is received from the 2G base station or the 2G and 2.5G overlapping base stations while waiting for the location registration reception (S101), the home location register (HLR) is waited for. Requesting location registration (S102 to S103), receiving a location registration response from the home location register (S104), reading a reset message transmission flag (S105), and transmitting the read reset message Checking a flag (S106), if the transmission flag check result reset message transmission flag is set to "TRUE", sending a location registration response (S107), and the transmission flag check result reset message transmission flag is " FALSE ", the step (S108) of confirming whether the base station is 2G, and if it is determined that the 2G base station transmits a location registration response (S107). In contrast, if the check result is not the 2G base station, the step of reading reset activation information (S109), searching for the read reset activation information and checking whether the reset activation state (S110), and the check result If not in the reset activation state, go to the step (S107), and if the reset activation state step (S111) to determine whether the 2.5G Preferred 2.5G base station, and if the check result is not 2.5G Preferred 2.5G base station Moving to step S107, and if the check result is 2.5G Preferred 2.5G base station, reading the reset message configuration information (S112), and configuring the reset message with the read reset message configuration information (S113). And transmitting a reset request message to the configured reset message (S114).

Prior to describing the NDSS service method in the mobile communication switch according to the present invention, the home location register, the mobile communication switch, and the control station require additional function requests, as follows.

First, in the case of a home location register (HLR), a 2G subscriber and a 2.5G subscriber are distinguished from a subscriber profile and a field indicating a preferred system is added.

That is, fields indicating 2G subscribers (existing CDMA subscribers), 2G Preferred 2.5G subscribers (high-speed data viewing, subscribers reset to 2.5G system), 2.5G Preferred 2.5G subscribers are added, and when transmitting a location registration response The lien information is loaded in the profile and transmitted.

Next, MSC saves and manages lien system information when sending Registration Registration Result, and registers / delete information necessary to command reconnection to 2.5G system that overlaps its own area. Function to modify / search, reconnect to 2.5G system upon receiving registration from 2.5G registered subscribers, and relocate to 2.5G system upon receiving registration from 2.5G registered subscribers. The mobile station has a function of performing normal position registration when the mobile station fails to acquire the lien system and requests a position registration again.

In addition, the control station must manage configuration information for each base station to identify whether it is an area capable of only 2G service, an area capable of roaming service of a roaming service provider, or an area capable of 2.5G service, and a function to be manipulated by an operator should be added. . In addition, service option processing for IS-2000 systems must be added.

The NDSS service method is described in detail in the mobile communication exchange according to the present invention in the state where such a function is implemented as follows.

First, in step S101, the MSC waits to receive a location registration, and in step S102, when a location registration request is received from a 2G base station or a 2G and 2.5G overlapping base station, a location registration is performed with a home location register (HLR) in step S103. Requires.

In step S104, a location registration response is received from the home location register.

At this time, the home location register displays information indicating 2G subscribers (existing CDMA subscribers), 2G Preferred 2.5G subscribers (high-speed data views, subscribers reset to 2.5G systems) and 2.5G Preferred 2.5G subscribers in the location registration response message. And transmit it to the mobile communication exchange.

Next, in step S105, the reset message transfer flag is read from the database, and in step S106, the read reset message transfer flag is checked.

As a result, if the reset message transmission flag is set to "TRUE", the position registration response is sent in step S107 for normal position registration processing.

On the contrary, if the transmission flag check result reset message transmission flag is set to "FALSE", it is checked in step S108 whether it is a 2G base station.

As a result, in the case of a 2G base station, the mobile station moves to step S107 to transmit a location registration response for normal location registration.

On the contrary, if the check result is not the 2G base station, the reset activation information is read in step S109. In step S110, the read reset activation information is searched to check whether the reset activation information is present.

If the check result is not in the reset activation state, the mobile station proceeds to step S107 and performs normal location registration. In contrast, if it is in the reset activation state, it is checked in step S111 whether the 2.5G preferred 2.5G base station is present.

If the check result is not 2.5G Preferred 2.5G base station, go to step (S107) to perform a normal location registration, if the check result is 2.5G Preferred 2.5G base station read the reset message configuration information in step S112 It will be.

Then, in step S113, a reset message is configured with the read reset message configuration information, and in step S114, a location registration reset is requested with the configured reset message.

According to the present invention "NS service method in the mobile communication switch" described above, the 2.5G system subscribers have the advantage that roaming (roaming) in 2G, the location registration reception and outgoing call of the 2.5G subscriber in the 2G system It is possible to send the reset message to the 2.5G system for the advantage that the subscriber can access to the preferred system.

Claims (3)

In the NDSS service method in a mobile communication switch of a mobile communication system consisting of a mobile station, a base station, a control station, a mobile communication switch, and a home location register, Requesting location registration from the home location register (HLR) when a location registration request is made from a 2G base station or a 2G overlapping base station in a location registration reception standby state; Reading a reset message transfer flag and checking the read reset message transfer flag when a location registration response is sent from the home location register; Transmitting a location registration response normally when the transmission flag check result reset message transmission flag is set to "TRUE"; Confirming whether or not the transmission flag check result reset message transmission flag is set to "FALSE", and confirming whether the 2G base station is normal, and if the transmission flag check result is the 2G base station; Reading reset activation information when the 2G base station is not the result of the checking, and retrieving the read reset activation information to determine whether the 2.5G Preferred 2.5G base station is present; In the case of the 2.5G Preferred 2.5G base station as a result of the check, a reset message is configured by reading the reset message configuration information and requesting the location registration reset with the configured reset message. Ss service method. The method of claim 1, wherein the home location register adds information indicating a preempted system to an existing subscriber profile and transmits it to the mobile communication switch when the location registration response is received. . The system of claim 2, wherein the lien system information includes information indicating a 2G subscriber (existing CDMA subscriber), information indicating a 2G Preferred 2.5G subscriber (high-speed data visibility, a subscriber reset to a 2.5G system), and 2.5G. Preferred 2.5G subscriber service method in the mobile communication switch, characterized in that the information.