KR19990008910A - Control packet structure for providing packet service and user data transmission method using same - Google Patents

Abstract

The present invention relates to a control packet structure for providing a packet service in a wireless subscriber network (WLL) using CDMA, and provides a packet using a common channel for packet communication without a separate dedicated channel allocation between a terminal station and a base station. In order to make the channel available only at the moment to be transmitted, we propose a procedure for allocating data slots on a common channel in data transmission and a data slot allocation procedure for retransmitting lost data. By proposing the structure of, all packet service users can receive the packet service without additional dedicated channel allocation, thereby avoiding the waste of the wireless channel and minimizing the power usage of the wireless channel due to packet data transmission. To reduce the quality of service for users on the phone. And it is.

Description

Control packet structure for providing packet service and user data transmission method using same

The present invention relates to a structure of a user and control packet using a wireless channel provided for packet service in a wireless subscriber network system using code division multiple access (CDMA).

Conventionally, packet data service in a digital mobile communication system is achieved by allocating a dedicated channel for each user who requests a packet data service.

For example, in the IS-95 CDMA cellular network, packet data is transmitted using a primary traffic or a secondary traffic channel on a dedicated voice traffic channel allocated using an access channel and a paging channel.

That is, if voice or asynchronous data is in progress, the secondary traffic channel is used, otherwise the primary traffic channel is used.

Here, the primary or secondary traffic channel refers to the type of frame transmitted to the assigned traffic channel.

In the channel allocation and packet transmission as described above, the packet data of another user cannot be transmitted unless the traffic channel is allocated for itself.

Therefore, the user and control packet transmission procedure, which has been used in the conventional digital mobile communication method for packet data service, cannot support channel sharing by multiple users, which is an advantage of packet switching, due to the structure of the wireless channel provided by the system. In addition, from the viewpoint of the base station, there is a problem in that a waste of radio resources occurs when user communication with a channel assigned is not performed.

In order to solve the above problems, the present invention proposes a control packet and a control packet transmission procedure for a packet service, so that all users requesting the packet data service use the radio channel only at a time when they want to transmit the packet. By doing so, it is possible to prevent waste of radio resources, and as a result, to minimize interference to voice call users that are already in progress due to packet transmission.

1 is a block diagram of a general wireless network subscriber system to which the present invention is applied.

2A, 2B and 2C are diagrams illustrating a radio channel for transmitting control packets of a terminal station and a base station of the present invention.

3 is a packet data slot allocation request packet structure on a reverse packet traffic channel of the present invention;

4 is a diagram illustrating a packet data slot allocation packet structure on a reverse packet traffic channel of the present invention.

5 is a structural diagram of a first user data transmission packet transmitted on a reverse packet traffic channel according to the present invention.

6 is a diagram of a second user data transport packet structure transmitted on a forward packet traffic channel in accordance with the present invention.

7 is a structure diagram of a response control packet transmitted on a packet access channel according to the present invention.

8A, 8B, 8C are structure diagrams of response control packets transmitted on a packet signal channel in accordance with the present invention;

9 is an acknowledgment control packet structure diagram for a response control packet transmitted on a packet access channel according to the present invention;

10 is a flowchart of user data transmission from a terminal station to a base station according to the present invention.

11 is a flow chart of user data transmission from a base station to a terminal station in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10,20,30: cell 11,21,31: base station

12,13: terminal station 12a, 13a: fixed terminal

12b, 13b: terminal station matching device 40: wireless subscriber network switching station

50: Public switched telephone network (PSTN) 60: Integrated Information Network (ISDN)

70, 71, 72, 73: terminal station identifier (1), (2), (3), (4)

80: number of user data transmission slots 90: first logical channel identifier

100: number of control packets 110: power control command

120: second logical channel identifier 130: first sequence identifier

140: first sequence number

150: indicator indicating the last packet

160: first user data 170: second sequence identifier

180: second sequence number

190: Identifier indicating the last packet

200: second user data

In order to achieve the above object, the present invention provides a method for transmitting a control packet of a packet service supported by a wireless subscriber network system, wherein the terminal station transmits a control packet using a packet access channel when a terminal station wants to transmit a user packet to a base station. In the reverse packet traffic channel, which is a common channel, a base station is granted a right to use a specific packet data slot.

The base station's grant procedure for the request for the reverse packet traffic channel use of the terminal station not only prevents the base station's data demodulation for the received packet by transmitting packet data in the same packet data slot at the same time. This is to prevent the degradation of service quality of ongoing voice call user.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a general wireless network subscriber system to which the present invention is applied.

In view of the above configuration, the wireless subscriber network switching center is wired to the public service telephone network (PSTN) 50 and the integrated service digital network (ISDN) 60, and has a plurality of cells. It is connected by wire with (10, 20, 30).

Each cell 10, 20, 30 is provided between a base station 12, 13 having a fixed terminal 12a, 13a and a terminal station matching device 12b, 13b and a base station 11, 21, 31 in the cell. The base station 11, 21, 31 in the cell is wirelessly connected to the wireless subscriber network switching center 40 by wire.

Referring to FIG. 1, the configuration of a general wireless network subscriber system to which the present invention is applied is as follows.

The terminal stations 12 and 13 are composed of fixed terminals 12a and 13a and terminal station matching devices 12b and 13b. A fixed terminal is a data terminal equipment (DTE) that is already in use or can be used. This includes landline telephones, personal computers, and terminals for ISDN.

The terminal station matching devices 12b and 13b reliably transmit information generated in the fixed terminals 12a and 13a or intended to be transmitted to the fixed terminals in a radio section, and the base stations 11, 21 and 31 It forms an endpoint on the radio access protocol of.

The base stations 11, 21, 31 are end points on the radio access protocol on the network side, and have a wired interface function with the wireless subscriber network switching center 40.

The wireless subscriber network switching center 40 has a single station switching function or a long distance switching function, and is connected to a fixed communication network such as a public line switched telephone network (PSTN) 50 and an integrated information communication network (ISDN) 60.

2A, 2B and 2C are diagrams illustrating a radio channel configuration for transmission of control packets between a terminal station and a base station according to the present invention.

The structure of the radio channel is provided by the system for packet data service, and the function of each channel for transmitting the control packet will be described with reference to the following.

The radio channel between the terminal stations 12, 13 and the base stations 11, 21, 31 for transmitting the control packet is composed of a packet access channel, a forward packet traffic channel, a packet signal channel, and a reverse packet traffic channel.

The packet access channel and the reverse packet traffic channel are used for packet transmission of the terminal station, and the forward packet traffic channel and signal channel are used for the terminal station 12, 13 to receive packets from the base stations 11, 21, 31. do.

The packet access channel is a channel shared by all the terminal stations 12 and 13 and is used by a random access procedure when transmitting a packet.

The reverse packet traffic channel is also a channel shared by all the terminal stations 12 and 13, and has a structure in which a specific user uses a specific packet data slot only once with the permission of the base stations 11, 21 and 31.

The signal channel and the forward packet traffic channel are broadcast type transmission channels operated under the management of the base stations 11, 21, and 31. When the packet service of the terminal station and the base station is started, the terminal stations 12, 13 are informed through the channel. Can be received.

3 is a diagram illustrating a packet data slot allocation request packet structure on a reverse packet traffic channel of the present invention.

The structure is a structure of a control packet transmitted by the terminal stations 12 and 13 to the base stations 11, 21 and 31 in a packet access channel to request packet data slot allocation of the reverse packet traffic channel for transmitting user packet data. to be.

The control packet consists of the number 80 of packet data slots necessary for transmitting the user packet and the identifiers 70, 71, 72, 73 of the terminal station to which the user packet is to be transmitted.

The number of packet data slots requested by the base stations 11, 21, and 31 is determined according to the size of the user packet to be transmitted and the transmission capability of the reverse traffic channel.

The terminal station identifiers 70, 71, 72, and 73 refer to the number of the terminal station which intends to use the packet data slot of the reverse packet traffic channel.

4 is a diagram illustrating a packet data slot allocation packet structure on a reverse packet traffic channel of the present invention.

FIG. 4 is a control diagram of a base station 11, 21, 31 transmitting a packet signal channel to a terminal station 12, 13 in order to allocate a slot for a packet data slot request on a reverse packet traffic channel transmitted by the terminal station. Represents the structure of a packet.

The control packet is a packet data slot identifier allocated by the base stations 11, 21, and 31 so that the terminal stations 12 and 13 transmit the user packet on the reverse packet traffic channel, and power to be used when transmitting the user packet on the reverse packet traffic channel. The control command 110, the terminal station identifiers 70, 71, 72, and 73 to receive the control packet, and the first logical channel identifier 90 to be used when transmitting the user packet.

Packet data slots allocated by the base stations 11, 21, and 31 for user packet transmission of the terminal stations 12, 13 are allocated continuously or discontinuously according to the packet data slot allocation algorithm of the base station.

Depending on the load of the system, the base stations 11, 21, 31 may not be allocated as many as the number of packet data slots requested by the terminal stations 12, 13.

The power control command 110 transmitted in the control packet is determined according to the power level of the control packet received by the base station 11, 21, 31 on the packet access channel.

This control packet transmitted on the packet signal channel can be received by all terminal stations 12 and 13, so that the terminal station identifier is used so that only the terminal station that has requested a packet data slot can receive and process it.

The first logical channel identifier 90 has a one-to-one correspondence with the terminal station identifiers 70, 71, 72, and 73 to prevent the size of the user packet actually transmitted due to the terminal station identifier.

5 is a structural diagram of a first user data transmission packet transmitted on a reverse packet traffic channel according to the present invention.

FIG. 5 illustrates a structure of a user packet that a terminal station 12 or 13 transmits to a base station through a reverse packet traffic channel in order to transmit user data using a packet data slot allocated by the base stations 11, 21, and 31. will be.

The user packet is composed of a first sequence identifier (130), a first sequence number (140), a second logical channel identifier (120), and an indicator 150 indicating the end of the packet.

The first order identifier 130 is an identifier assigned to each user data that the terminal stations 12 and 13 request to transmit to the base stations 11, 21, and 31. If the number is insufficient to divide the user data, it is referred to when recombining the divided user data.

The first sequence number 140 is a number assigned to each packet unit in a packet data slot and is used for retransmission of a packet lost due to a transmission error.

The first logical channel identifier 90 is used to indicate the terminal stations 12, 13 transmitting this packet.

The base station 11, 21, 31 knows that the received user packet is the last packet transmitted by the terminal station 12, 13 can transmit a response control packet for the received packet to the assigned packet data slot. An indicator 150 is needed to indicate the end of the packet.

6 is a structural diagram of a second user data transmission packet transmitted on a forward packet traffic channel according to the present invention.

6 illustrates a structure of a user packet transmitted by a base station to a terminal station in a forward packet traffic channel in order to transmit user data from the base stations 11, 21, and 31 to the terminal stations 12 and 13.

The user packet includes a second sequence ID 170, a second sequence number 180, a terminal station identifier 70, 71, 72, 73, an indicator 190 indicating the end of the packet, It consists of a packet access slot number for sending a response control packet to this packet.

The second order identifier 170 is an identifier assigned for each user data unit that the base stations 11, 21, 31 request transmission to the terminal stations 12 and 13, and the terminal station requests retransmission for specific user data to the base station. When used, it is used to distinguish user data to be resent at the base station.

In addition, the second sequence number 180 is a number assigned to each packet unit in the packet data slot and is used for retransmission of a packet lost due to a transmission error.

Since all terminal stations 12, 13 can receive user packets in the forward packet traffic channel, terminal station identifiers 70, 71, 72, 73 are used to indicate the terminal station to process the received user packets. .

The terminal station 12, 13 may transmit the response control packet to the packet received in the packet data slot knowing that the received user packet is the last packet transmitted by the base station (11, 21, 31). An identifier 190 is needed to indicate that it is last.

The packet access slot number is a slot number of a packet access channel to be used when transmitting a response control packet for this user packet.

7 is a structure diagram of a response control packet transmitted on a packet access channel according to the present invention.

FIG. 7 illustrates a structure of a control packet transmitted by the terminal station to the base station in the packet access channel with respect to the user packet transmitted from the base stations 11, 21, and 31 to the terminal stations 12 and 13.

The control packet consists of a second sequence ID 170, a second sequence number 180 of the received packet, and a terminal station identifier 70, 71, 72, 73.

FIG. 7 is a response control packet for the user packet of FIG. 6, where the second sequence identifier is the same as the second sequence identifier included in the user packet of FIG. 6, and the second sequence number is placed on the successfully received user packet. Same as the second sequence number.

The terminal station identifiers 70, 71, 72, and 73 are used to indicate the terminal stations 12, 13 transmitting this control packet.

8A, 8B, and 8C are structure diagrams of response control packets transmitted on a packet signal channel according to the present invention.

8A includes a second sequence ID 170, a second sequence number 180 of the received packet, and a terminal station identifier 70, 71, 72, or 73.

8B selects packet data slot numbers corresponding to the number of slots allocated for retransmission of user data having the structure when retransmission is required for the packet transmitted by the terminal station.

In FIG. 8C, when the terminal station allocates a packet data slot less than the requested slot, the packet data slot for transmitting the remaining packets is selectively required.

9 is an acknowledgment control packet structure diagram for a response control packet transmitted on a packet access channel according to the present invention.

The control packet comprises a terminal station identifier (70, 71, 72, 73), the response control packet to the control packet of FIG. 7, the sequence identifier is a second sequence identifier 170 carried in the user packet of FIG. Is the same as

This packet is transmitted to the packet signal channel by the base stations 11, 21, and 31 in order to prevent the control packet retransmission of FIG. 7 according to the random access procedure of the packet packet access channel.

10 is a flowchart of user data transmission from a terminal station to a base station according to the present invention.

10 illustrates the second user data 200 from the terminal stations 12 and 13 toward the base stations 11, 21, and 31 using the user and control packets of FIGS. 3, 4, 5, and 8. It shows the procedure of transmission.

Referring to FIG. 10, a procedure for transmitting a user packet from the terminal stations 12 and 13 to the base stations 11, 21, and 31 is as follows.

The terminal stations 12 and 13 to transmit user packets request the base station 11, 21 and 31 to allocate packet data slots on the reverse packet traffic channel using the control packet of FIG.

Upon receiving the packet data slot allocation request of the terminal station 12, 13, the base station 11, 21, 31 checks the number of available packet data slots, and if the allocation is possible, transmits the packet data to the terminal station 12, 13; The control packet of FIG. 4 is transmitted for slot allocation.

Depending on the number of available packet data slots of the base stations 11, 21, 31, the terminal stations 12, 13 may not be allocated a packet data slot of the requested size.

Using the transmission control packet of FIG. 5 and the response control packet of FIG. 8, the terminal stations 12 and 13 transmit user packet data to the base stations 11, 21, and 31.

Upon receiving the response control packet, the terminal stations 12 and 13 perform the retransmission procedure using the transmission control packet of FIG. 5 according to the presence or absence of the lost transmission control packet.

Even when the terminal stations 12 and 13 are allocated a smaller number of slots than the requested packet data slots, the user station does not transmit the user data packet using the transmission control packet of FIG.

11 is a flowchart of user data transmission from a base station to a terminal station according to the present invention.

11 is a procedure for transmitting the second user data 200 from the base stations 11, 21, 31 to the terminal stations 12, 13 using the user and control packets of FIGS. 6, 7, and 9. Indicates.

Referring to FIG. 11, a procedure for transmitting a user packet from the base stations 11, 21, and 31 to the terminal stations 12 and 13 will be described.

Since the forward packet traffic channel is managed by the base stations 11, 21, and 31, the packet data slot allocation procedure as shown in FIGS. 3 and 4 is unnecessary.

The base stations 11, 21, and 31 carry user packets for transmission to the terminal stations 12 and 13 in packet data slots on the forward packet traffic channel in the transmission control packet of FIG.

All terminal stations 12, 13 monitor the data transmitted in the packet data slots to receive user packets from the base stations 11, 21, 31, and transmit a response control packet if it is delivered to them.

The acknowledgment control packet is transmitted in the packet access channel, so that the base station 11, 21, 31 transmits an acknowledgment control packet for the received acknowledgment control packet in the packet signal channel to inform the successful reception.

As described above, the present invention proposes a control packet structure and procedure for providing a packet service in a wireless network subscriber system having forward and reverse packet traffic channels, packet access channels, and packet signal channel structures for packet services. By using a common channel for all packet service users, packet service is possible without a separate dedicated channel assignment.

As a result, the present invention can prevent the waste of the wireless channel by eliminating the dedicated channel allocation for each user requesting the package service, and prevents the degradation of the quality of service of the busy user by minimizing the power usage of the wireless channel due to packet data transmission. It can work.

Claims (13)

A wireless subscriber network switching station connected by wire with a public switched telephone network (PSTN) and an integrated telecommunication network (ISDN), and a terminal station having a fixed terminal and a terminal station matching device for wireless communication with a base station connected by wire with the switching station. A control packet structure for providing packet service between a base station and a terminal station in a CDMA wireless subscriber network system including a plurality of cells, A packet data slot request packet transmitted by the terminal station to a base station using a packet access channel to request packet data slot allocation on a reverse traffic channel; A packet data slot assignment packet transmitted by the base station to allocate a slot to the terminal station using a packet signal channel for a packet data slot request on the reverse packet traffic channel transmitted by the terminal station; A user data transmission packet transmitted by a terminal station using a reverse packet traffic channel to a base station for transmitting user data using a packet data slot allocated by the base station; And Control packet structure for providing a packet service, characterized in that consisting of a response packet transmitted by the base station using a packet signal channel to the terminal station to respond to the transmitted user data transmission packet. The method of claim 1, wherein the packet data slot request packet is Terminal station identifiers to use a packet data slot; Control packet structure for providing a packet service, characterized in that the number of slots necessary for transmitting user data. The method of claim 1, wherein the packet data slot allocation packet is Terminal station identifiers for allocating packet data slots; A first logical channel identifier to use in transmitting the user packet; The number of slots allocated for transmitting user data; Packet data slot numbers equal to the number of slots allocated for transmitting user data; And Control packet structure for providing a packet service, characterized in that consisting of a power control command to be used by the terminal station. The method of claim 1, wherein the user data transmission packet A second logical channel identifier used to indicate a terminal station transmitting its own packet; When the terminal station divides user data because the number of packet data slots allocated by the base station is insufficient as an identifier assigned to each user data requesting transmission to the base station, the first order identifier used for recombining the divided user data and ; A first sequence number used for retransmission of a packet lost due to a transmission error to a number assigned to each packet unit carried in the packet data slot; An indicator indicating the end of a packet for transmission of a response control packet to a packet received by the base station; Control packet structure for providing a packet service, characterized in that the first user data. The method of claim 1, wherein the response packet Terminal station identifiers; A second order identifier; A control packet structure for providing a packet service, comprising a second sequence number including an extension value. The method of claim 5, wherein the response packet If retransmission is necessary for the packet transmitted by the terminal station, the packet data slot number corresponding to the number of slots allocated for retransmission of user data or When the terminal station allocates less packet data slots than the requested slot, the control packet structure for packet service providing, characterized in that the packet data slot number as the number of slots allocated for additional transmission of user data is selectively added. . A wireless subscriber network switching station connected by wire with a public switched telephone network (PSTN) and an integrated telecommunication network (ISDN), and a terminal station having a fixed terminal and a terminal station matching device for wireless communication with a base station connected by wire with the switching station. A control packet structure for providing packet service between a base station and a terminal station in a CDMA wireless subscriber network system including a plurality of cells, A user data transmission packet in which the base station transmits user data to the terminal station using a forward packet traffic channel; A response packet transmitted from the terminal station to the base station using a packet access channel to respond to the transmitted user data transmission packet; Control packet structure for providing a packet service, characterized in that consisting of a response acknowledgment packet transmitted to the terminal station by the base station using a packet signal channel to confirm the response packet. The method of claim 7, wherein the user data transmission packet, Terminal station identifiers; Second order identifier; Second sequence number; An identifier indicating that it is the last packet; And Control packet structure for providing a packet service, characterized in that the second user data. The method of claim 7, wherein the response packet, Terminal station identifiers; Second order identifier; And Control packet structure for providing a packet service, characterized in that the second sequence number. The method of claim 7, wherein And wherein the response acknowledgment packet consists of terminal station identifiers. A method for transmitting user data using a control packet between a base station and terminal stations in a CDMA wireless subscriber network system, A first step of the terminal station transmitting user data to the base station using the control packet only when it is time to transmit the user packet; And a second process of transmitting, by the base station receiving the user data, the user data to the terminal station by using the control packet. The method of claim 11, wherein the first process comprises: A first step of requesting, by a terminal station to transmit a user packet, packet base station allocation to a base station using a packet data slot request packet; A second step of examining the number of available packet data slots by the base station receiving the slot allocation request; A third step of the base station allocating a slot to the terminal station using the packet data slot allocation packet if the allocation is possible after the investigation; A fourth step of the terminal station allocated with the slot transmitting the user data to the base station using the user data transmission packet; And a fifth step in which the base station receiving the transmitted user data responds to the terminal station by using a response packet. The method of claim 11, wherein the second process, A first step of the base station transmitting user data to the terminal station using the user data transmission packet; A second step of the terminal station receiving the transmitted user data responding to the base station using a response packet; And a third step in which the base station confirms to the terminal station using the response acknowledgment packet with respect to the response.