KR20030005750A - Packet control system, mobile communication system and call set-up method - Google Patents

Abstract

PURPOSE: A system for controlling packets, a mobile communication system including the same, and a method for setting up call are provided to implement a large packet control system by controlling a plurality of PCF-Bs with one PCF-C. CONSTITUTION: A PCF-C(Packet Control Function-Control)(110) is composed of a session control function storing session information about each terminal(20) during a dormant period, managing UATI(Unicast Access Terminal Identifier) resources, assigning the UATI to the terminals(20), and taking charge of session set up; and a mobility management executing functions of supporting home location registry and hand-off. A plurality of PCF-Bs(Packet Control Function-Bearer)(100) buffer data related to air ling status and route bearer packets between PDSNs(80) and base stations(30) by interworking with the PCF-C(110).

Description

Packet control system, mobile communication system and call setup method including the same {PACKET CONTROL SYSTEM, MOBILE COMMUNICATION SYSTEM AND CALL SET-UP METHOD}

The present invention relates to a packet control system, a mobile communication network including the same, and a call setup method in the network. More specifically, the packet control unit of the 3GPP2 1xEV-DO network includes a session control unit and a mobility management unit. It consists of "PCF-C"; Packet Confrol Function-Control) and Packet Control-bearer processing unit ("PCF-B"; Packet Confrol Function-Bearer), enabling the construction of large-scale packet control system and effective session and mobility management. The present invention relates to a packet control system, a mobile communication network including the same, and a call setup method in the network.

IMT-2000 (International Mobile) is a third generation future airborne land mobile communication system (FPLMTS) that overcomes the limitations of local and voice-centricity of conventional mobile communication and provides non-voice (voice, data, video, etc.) regardless of region. Telecommunication (Telecommunication) is being standardized by combining Europe-based 3GPP DS-WCDMA (UMTS) and North American 3GPP2 MC-CDMA. Synchronous CDMA mobile communication is classified into cdmaOne, which is an existing IS-95 series and cdma2000, which is an IS-2000 series for the IMT-2000, according to a wireless section protocol.

CDMA 2000 1 × EV (Evolution) -DO (Data Only) is a data-only high-speed communication network that is distinct from the fact that existing IS-95 or 1xRRT networks are voice-centric and low-speed data transfers, while they are high-speed data only. Has This 1 × EV-DO network uses a dedicated protocol for packet data transmission that is completely different from the existing IS-2000 wireless protocol.

Because of the characteristics of packet data, a service (for example, the Internet) downloaded from a system is dominant, so 1xEV-DO has a structure in which channel speeds in the forward and reverse directions are different. For example, it has an asymmetric data rate structure capable of up to 2.4 Mbps in forward and 153.6 Kbps in reverse.

A schematic configuration of a mobile communication system for such 1xEV-DO service is shown in FIG. 1. Looking at 1xEV-DO in terms of network structure, the wireless IP network structure defined in IS-835 can be applied to packet data systems without change. Referring to FIG. 1, a mobile communication system for 1xEV-DO service includes a plurality of terminals (Access Terminal-20), a base station (AN: Access Network-30), and authorization / authentication / billing (AAA). 70) a server, a packet data service node (PDSN), a packet control function (PCF), and the like.

In such a mobile communication system, the terminal (AT) 20 is a device for providing data connectivity to a user, and the terminal is a mobile communication terminal or a information processing device such as a laptop computer or the like that the user can carry and communicate with. Data processing may be built in, such as a personal digital assistant (PDA).

A base station (AN) 30 provides connectivity between the packet switched data network and the terminal AT.

The Packet Control Function (PCF) is linked with the packet data service node 80 to manage handover control, manage packet data service profiles of terminals, a packet routing function, and a radio resource control function. It transmits packet session information between PCFs during data relay, packet buffering, and handoff.

Authorization / authentication / billing (AAA) server 70 performs authentication, authorization verification, and billing functions for the user. For this purpose, RADIUS protocol is used and service billing information collection function, mobile IP registration authentication function, dial-in service user authentication / authorization verification function are performed.

In the CDMA2000 1xEV-DO network of the existing 3GPP2 as described above, since the packet controller (PCF) takes care of all kinds of control and bearer processing, effective session control and mobility management are difficult and can be processed by one IP. This limitation makes it difficult to construct a large-scale packet control unit.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the problems of the prior art described above, in which a packet control unit comprises a packet control-control processing unit and a packet control bearer processing unit in a 1xEV-DO network, and one packet control-control processing unit controls a plurality of packets. The present invention provides a packet control system capable of configuring a large-scale packet control system and enabling effective session control and mobility management, and a mobile communication system and a call setup method including the same.

Another object of the present invention is to provide a packet control system capable of large-scale packet processing and simplifying a call processing process, and improving a quality of a mobile communication service, a mobile communication system and a call setup method including the same.

One aspect of the present invention for achieving the above object is

Session control and location registration and handoff for storing session information about each terminal during dormant period, managing unicast access terminal identifier (UATI) resources, assigning UATI to terminals, and in charge of session establishment A packet control function control unit (PCF-C) configured as a mobility management unit that performs a function of supporting a packet control function; And

Buffering data regarding air link status and routing bearer packets between a Packet Data Service Node (PDSN) and an Access Terminal (AT) in cooperation with a packet control-control processing unit; A packet control function bearer (PCF-B);

One packet control-control processing unit is a packet control system having a structure for controlling several packet control-bearer processing units.

Another aspect of the present invention for achieving the above object is

A packet data service node; A mobile communication system including a packet control function, an authorization / authentication / billing server (AAA), the mobile communication system storing session information for each terminal during a dormant period, Packet Control Function (PCF-C: Packet Control Function), which consists of a session control unit that manages UATI resources, assigns UATIs to terminals, establishes sessions, and a mobility management unit that supports location registration and handoff. Control); And

Packet control-bearer processing unit (PCF-B) for buffering data on air link status and routing bearer packets between the PDSN and the base station in conjunction with the packet control-control processing unit. A mobile communication system comprising a packet control system including a function bearer.

Another aspect of the present invention for achieving the above object is

A call setup method for processing a call in a mobile communication network including a packet control system of the present invention,

After the traffic setting and authentication procedure is completed, transmitting a XonRequest message to the packet control-bearer processor notifying that the packet control-controller sends actual bearer traffic;

And a packet control-bearer processing unit transmitting a response message (XonResponse message) to the packet control-control processing unit.

Another aspect of the present invention for achieving the above object is a computer-readable recording medium having stored thereon a program for executing a function for implementing the method.

1 is a schematic diagram of a conventional 1xEV-DO mobile communication system,

2 is a schematic diagram of a mobile communication system according to an embodiment of the present invention;

3 is a flowchart illustrating a call processing method in a mobile communication system according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

20: access terminal (AT) 30: access network (AN)

70: Authorization Authentication Accounting (AAA)

80: Packet data service node (PDSN)

100: Packet Control Function Control (PCF-C)

110: packet control function bearer (PCF-B)

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

The present invention divides a packet control unit, which is an interworking device of a 1xEV-DO base station and a packet network, into a packet control-control processing unit (PCF-C) and a packet control bearer processing unit (PCF-B), and a packet control-control processing unit (PCF-C). A session control unit and mobility management unit can be used to handle a large amount of packets (one packet control control unit (PCF-C) can control multiple packet control units). It is possible.

2, a mobile communication system according to the present invention includes a plurality of terminals (AT) 20, a base station (AN) 30, a packet control control unit (PCF-C) 110, and a packet control bearer processing unit (PCF). 100B, authorization / authentication / billing server (AAA) 70, packet data service node (PDSN) 80, and so on.

In the mobile telecommunication system of the present invention, the terminal (AT) 20 is a wireless terminal including a mobile communication terminal, a PDA (Personal Digital Assistant), etc., which the user can carry and communicate with.

The base station (AN) 30 is responsible for processing all air interface signaling messages when there is an A8 connection between the base station 30 and the PDSN 80. When the A8 connection is released, the base station 30 no longer maintains information about the AT 20 and the PCFs 100 and 110.

In the present invention, a packet control function (PCF) is composed of a control control unit (PCF-C) 110 and a bearer processing unit (PCF-B) 100, and the control control unit 110 is again connected with the session control unit 111. It is configured to include a mobility management unit (112).

The packet control function control unit (PCF-C) 110 is connected to the base station AN through the A9 interface (signaling interface) and to the AAA server 70 through the A12 interface. It is also connected to another Packet Control-Control Processing Unit (PCF-C) via the A13 interface.

The session controller 111 of the packet control-control processing unit 110 stores session information for each terminal 20 during the dormant period, manages UATI resources, allocates UATI to the terminal, and sessions. Keep the settings.

On the other hand, the mobility management unit 112 performs a function of supporting location registration and handoff, specifically, PCF-to-PCF handoff scenario (intra-PDSN) and PDSN-to-PDS handoff scenario (inter-PDSN) To process

A packet control function bearer (PCF-B) 100 is connected to a base station (AN) through an A8 interface, and is connected to a PDSN (80) through an A10 interface (bearer interface) and an A11 interface (signaling interface). ) The packet control-bearer processing unit 100 buffers data regarding an air link status, and bearer packets between the PDSN 80 and the base station 30 in cooperation with the packet control-control processing unit 110. (bearer packjets).

In the mobile communication system of the present invention, a new Ax interface is defined between the packet control-control processing unit 110 and the packet control-bearer processing unit 100. Therefore, the bearer packet is routed between the PDSN and the base station through this interface.

During the call setup process according to the call setup method in the mobile communication system according to the present invention, after a normal traffic setup and authentication procedure is completed, a transmission start request message (XonRequest message) indicating that the packet control-control processor sends actual bearer traffic. And transmitting a response message (XonResponse message) for the request to the packet control-controller by the packet control-bearer processor. In the call setup method of the present invention, a traffic setting and authentication process other than the above process between the packet control-control processing unit and the packet control-bearing processing unit may be performed in the same manner as before.

Referring to Figure 3 will be described in more detail the call setup method in a mobile communication network according to an embodiment of the present invention. First, when AT attempts to access the system, the terminal must be temporarily assigned an address of the terminal from PCF-C of the PDSN, and the terminal provides the temporary address UATI (Unicast Access Terminal Idendifier). The UATI-Request message is transmitted to the base station (AN) using the access channel, and the base station (AN) transmits the UATI request message to the packet control-controller (PCF-Control) through the A9 interface. The packet control control unit (PCF-Control) sends a UATI-Asignment message to the base station (AN) through the A9 interface, and the base station transmits the data back to the terminal. That is, the UATI is transmitted from the base station (AN) to the terminal (AT) through the UATI-Asignment message. In response, the terminal transmits a UATI-Complete message to the base station.

Subsequently, the base station transmits an A9-Setup-A8 message requesting bearer pass allocation to the packet control controller, and the packet control controller transmits an A9-Setup-A8 Complete message to the base station.

In this way, when the session is opened, the negotiation and configuration are handled on the sending and receiving sides. The base station receives the traffic channel assignment message from the terminal and transitions to the traffic channel, and the terminal completes the traffic channel setting by transmitting a traffic channel complete message to the base station.

When the traffic channel setup is completed, a predetermined authentication process is performed. For example, PPP CHAP (Channel Handshake) for confirming subscriber's information to complete a PPP link establishment (PPP link establishment). Protocol authentication is used to examine subscriber credentials.

Upon successful completion of the authentication procedure, the packet control-controller sends a XonRequest message to the packet control-bearer processor (PCF-B) indicating that actual bearer traffic is sent through the Ax interface. The bearer processing unit (PCF-B) transmits a response message (XonResponse message) to the packet control control unit (PCF-C).

In this state, the UE transmits a bearer transmission start request message (XonRequest message), which is actual user data, to the base station, and the base station transmits a response to the transmission start response message (XonResponse message) to establish a PPP connection. You can transfer your own data.

The above-mentioned call processing function of the present invention can be embodied as computer readable code on a recording medium. The call setup method of the present invention may be executed by a computer program stored in a computer-readable memory device. Such a computer-readable recording medium may include a read only memory (ROM) for storing a computer program or a microprocessor for executing a stored program. In another embodiment, the recording medium includes a random access memory (RAM), a programmable read only memory (PROM), a diskette, a hard disk, a PCMCIA memory card, a logic circuit, an optical disk, a CD-ROM, and a digital versatile disk (DVD). can do. The recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

Although the exemplary embodiments of the present invention have been described above by way of example, it is only for the purpose of description and should not be construed as limiting the present invention. Modifications and design changes within the scope without departing from the spirit of the present invention will be apparent to those skilled in the art and all are intended to be included within the protection scope of the present invention.

According to the present invention, since one PCF control unit (PCF-C) can manage several packet control-bearer processing units (PCF-B), it is possible to implement a large-capacity packet control system.

The terminal may roam with coverage of another packet control unit (PCF) connected to the same or different packet data network, and if the packet zone ID changes due to inter-PCF handoff (handoff at the same PDSN), A new PPP link must be established and a MIP registration procedure must be repeated. According to the present invention, since one PCF-C manages multiple PCF-Bs, the occurrence of inter-AN hand-off is reduced. In addition, since the coverage is expanded when receiving data, the reception rate is improved, and ultimately, the quality of a high-speed data transmission service through a mobile communication network can be improved.

In addition, according to the present invention, since the mobility management and session control is performed in the packet control-control processing unit, since the call management flow is simplified compared to the existing system in which the mobility management and session control are handled by separate network elements. Speed up call service.

Claims (5)

Session control and location registration and handoff for storing session information about each terminal during dormant period, managing unicast access terminal identifier (UATI) resources, assigning UATI to terminals, and in charge of session establishment A packet control function control unit (PCF-C) configured as a mobility management unit that performs a function of supporting a packet control function (PCF-C); And Packet control-bearer processing unit (PCF-B) for buffering data on air link status and routing bearer packets between the PDSN and the base station in conjunction with the packet control-control processing unit. Function-bearer), A packet control system having a structure in which one packet control-control processing unit controls several packet control-bearer processing units. A packet data service node; A mobile communication system including a packet control function and an authorization / authentication / billing server (AAA). The session control unit stores session information for each terminal 20 during a dormant period, manages UATI resources, assigns UATIs to terminals, and supports location registration and handoff. A packet control function control unit (PCF-C) configured as a mobility management unit that performs a function; And Packet control-bearer processing unit (PCF-B) for buffering data on air link status and routing bearer packets between the PDSN and the base station in conjunction with the packet control-control processing unit. And a packet control system including a function-bearer. A call setup method for processing a call in a mobile communication system of claim 2, After the traffic setting and authentication procedure is completed, transmitting a XonRequest message to the packet control-bearer processor notifying that the packet control-controller sends actual bearer traffic; And a packet control-bearer processing unit transmitting a response message (XonResponse message) to the packet control-control processing unit. Transmitting, by the terminal, a UATI-Request message (UATI-Request message) to the base station (AN) in order to be assigned a unicast access terminal identifier (UATI); Transmitting, by the base station AN, the UATI request message to the packet control control unit; Transmitting, by the packet control-control processor, the UATI-Asignment message to the base station (AN); Transmitting, by the base station, an UATI assignment message to the terminal; Sending, by the terminal, a UATI-Complete message to the base station; Transmitting, by the base station, an A9-Setup-A8 message requesting bearer path allocation to the packet control controller; Transmitting, by the packet control-control processor, the A9-Setup-A8 Complete message to the base station; The terminal sending a traffic channel assignment message to the base station; The terminal sending a traffic channel complete message to the base station; An authentication step of verifying the subscriber's authority; Transmitting, by the packet control-controller, a XonRequest message to the packet control-bearer processor indicating that the bearer traffic is actually sent; Transmitting, by the packet control-bearer processor, a response message (XonResponse message) to the packet control-control processor; Transmitting, by the terminal, a transmission start request message of a bearer, which is actual user data, to the base station; And a base station transmitting a transmission start response message (XonResponse message). Transmitting a UATI-Request message (UATI-Request message) to the base station (AN) in order for the terminal to be assigned a unicast access terminal identifier (UATI); Transmitting, by the base station AN, the UATI request message to the packet control control unit; A packet control-control processing unit transmitting a UATI-Asignment message to a base station (AN); Transmitting, by the base station, the UATI assignment message to the terminal; Transmitting, by the terminal, a UATI-Complete message to the base station; Transmitting, by the base station, an A9-Setup-A8 message requesting bearer path allocation to the packet control controller; Transmitting, by the packet control-control processor, the A9-Setup-A8 Complete message to the base station; A terminal transmitting a traffic channel assignment message to a base station; A terminal transmitting a traffic channel complete message to a base station; An authentication function for verifying the subscriber's authority; A function of transmitting, to the packet control-bearer processing unit, a transmission start request message (XonRequest message) indicating that the packet control-control processing unit sends actual bearer traffic; A function of the packet control-bearer processing unit to transmit a response message (XonResponse message) to the packet control-control processing unit; Transmitting, by the terminal, a transmission start request message of a bearer, which is actual user data, to the base station; A computer-readable recording medium that records a program for executing a function of transmitting a XonResponse message by a base station.