KR100423148B1 - A srns relocation method of a packet network one of the asynchronous imt-2000 telecommunication network and the srsn relocation system - Google Patents

Abstract

The present invention relates to a method for relocating an RS in a packet network and a system for relocating an RS in an asynchronous IMT-2000 communication network. The present invention includes a source SGSN, a target SGSN, and a GGSN, and provides an IMT- according to the movement of a terminal. The present invention relates to a method for relocating an RNS from a source radio network controller (RNC) of a 2000 packet network to a target radio network controller, and relocates by receiving relocation resource allocation procedure information from the source SGSN by transmitting relocation request data to the source SGSN. Preparing a; When the preparation for relocation is complete, transmitting relocation delegation data to a target radio network controller to perform relocation detection for notifying the target SGSN that the radio network controller is currently serving the mobile station; Causing the target radio network controller to terminate the relocation after relocation detection; And releasing RAB resources according to the RAB resource release request from the source SGSN.

The present invention can minimize the delay for the real-time traffic by separating the path of the real-time data transmission traffic and the path of the non-real-time data transmission traffic, it can bring traffic load balancing effect according to the traffic QoS class.

Description

ASRNS RELOCATION METHOD OF A PACKET NETWORK ONE OF THE ASYNCHRONOUS IMT-2000 TELECOMMUNICATION NETWORK AND THE SRSN RELOCATION SYSTEM}

The present invention relates to IMT-2000, and in particular, relocation of SRNS (SRNS) for supporting QOS-based services in packet networks, which are communication networks of asynchronous IMT-2000. The present invention relates to a relocation method and a method for rearranging RNS.

Network structure for providing packet data service in the network of asynchronous IMT-2000 is generally composed of a circuit network and a packet network. The circuit network and packet network are matched with a UTRAN (UMTS Terrestrial Radio Access Network) and an Iu interface.

A mobile subscriber or a user connects to a mobile communication terminal (eg, a mobile telephone) using a terminal equipment such as a notebook or a general personal computer to connect to the Internet. Receive a packet data service. The mobile communication terminal accesses a UMTS Terrestrial Radio Access Network (UMTS) through an air interface, and the wireless access network provides a service GPRS support node (SGSN) through an Asynchronous Transfer Mode (ATM) or an Internet Protocol Network (IP). A service GPRS support node is connected to an external public network (Public Domain Network (PDN)) through a gateway general packet radio service support node (GGSN). In the packet data service system having such a structure, a wireless access network, a service GPRS support node, a gateway GPRS support node, a mobile switching center, and the like must be implemented to develop a packet data service of a mobile phone.

GPRS is a packet-switched packet data service dedicated service unlike the previous circuit-switched data service. The GPRS is configured independently of the existing voice mobile communication network. The components are composed of a Serving GPRS Support Node (SGSN) that provides interworking with the user side (including wireless access network) and a Gateway GPRS Support Node (GGSN), which is responsible for routing packet data to the packet network.

In general, in a code division multiple access (CDMA) system, when a mobile station moves from a currently serving base station to an adjacent base station, handoff (or handover) occurs. Such a handoff enables continuous service even when a mobile station moves from a currently serving base station to an adjacent base station. There are soft hand-off and hard hand-off. Soft handoff refers to a case in which a handoff occurs without a change in frequency channel, frame offset, etc., and hard handoff refers to a case in which a frequency channel, frame offset, service switching station change, or the like occurs.

As a conventional method of handling such handoff, a software that enables direct communication with a base station belonging to another switching station by using a switchable router between base stations belonging to another switching station to overcome the call disconnection phenomenon of the hard handoff. There is a method of providing a handoff. In addition, according to the related art, when a handover occurs due to mobility of a mobile communication terminal, a handover in a mobile communication network that buffers an untransmitted data packet at a wireless network control station and transmits the data packet to a corresponding mobile communication terminal through a mobile switching system City data transmission system and method have been proposed.

The concept of SRNS relocation, which is different from the above handoff or handover, refers to a process of changing a RNS (Radio Network Subsystem) currently in service from another SGSN perspective of a core network to another RNS. Therefore, in the case of hard handoff, both handoff and SRNS relocation occur, but in the case of soft handoff, handoff and SRNS relocation may occur separately. Basically, SRNS relocation may occur after the soft handoff has occurred, but in order for such SRNS relocation to be performed, the soft handoff must be performed first. In mobile mobile networks, such as asynchronous IMT-2000 networks, this relocation process plays a very important role among user requirements. Moreover, the packet network is more important than the circuit network.

However, the first conventional technology proposes a soft handoff using a router in a circuit network, and a handoff considering quality of service (QoS) in a wireless packet network cannot be executed. have. In addition, the second conventional technology also considers only buffering without separating the real-time service and the non-real-time service, and does not distinguish the characteristics of the traffic, and thus the data transmission / reception paths are the same, and thus mutual interference cannot be minimized. We tried to solve the handover for the code division multiple access network and the circuit switched network.

As described above, in the related art, the SRNS is relocated using a data forwarding mechanism using buffering in a radio network controller (RNC: RNC) regardless of the QoS of the corresponding service. And many real-time services such as MoIP (Multimedia of IP). In addition, since the transmission and reception paths of the real-time data transmission traffic and the non-real-time data transmission traffic are the same, the real-time traffic is relatively affected by the non-real-time traffic.

In addition, buffering the real-time service may cause a significant traffic delay, and the traffic delay occurs more and more when data needs to be transmitted and received in order at the protocol level.

This delay in traffic for users who want to receive real-time service causes loss of motivation for the user to use the service. As a result, there is a problem that the user changes the service provider or does not use the service. Occurs.

In order to solve this problem, the technical problem to be achieved by the present invention is to separate the path of the real-time data transmission traffic and the path of the non-real-time data transmission traffic to minimize the delay for the real-time traffic.

In addition, another object of the present invention is to provide a real-time data transmission service by providing a QoS processing function to a relocation of a Serving Radio Network Subsystem (SRNS) without changing message and information elements.

1 is a diagram illustrating a configuration of a packet network of an asynchronous IMT-2000 for performing SRNS relocation according to an embodiment of the present invention.

2 is a flowchart illustrating a SRNS relocation method according to an embodiment of the present invention.

3 is a view for explaining the SRNS relocation method according to FIG.

In order to achieve the above object, in the asynchronous IMT-2000 communication network according to an aspect of the present invention, a method of relocating an RS in a packet network is provided.

A method for relocating an RS from a source radio network controller (RNC) to an target radio network controller of an IMT-2000 packet network including a source SGSN, a target SGSN, and a GGSN, and providing a communication service according to a movement of a terminal,

Transmitting relocation request data to the source SGSN and receiving relocation resource allocation procedure information from the source SGSN to prepare for relocation;

When the preparation for relocation is complete, transmitting relocation delegation data to a target radio network controller to perform relocation detection for notifying the target SGSN that the radio network controller is currently serving the mobile station;

Causing the target radio network controller to terminate the relocation after relocation detection; And

Releasing a RAB resource according to a RAB resource release request from the source SGSN

It includes.

In the asynchronous IMT-2000 communication network according to another aspect of the present invention, the system for relocating RS in the packet network,

An RSN relocation system of an IMT-2000 packet network including a source SGSN, a target SGSN, and a GGSN to provide a communication service according to the movement of a terminal.

In response to occurrence of a relocation event of the currently serving radio network subsystem (SRNS), relocation delegation data is generated according to relocation command data received from the source SGSN, and non-real time in response to a release request for non-real time traffic from the source SGSN. A source radio network controller for releasing traffic and transmitting real-time traffic to the terminal; And

A target radio network controller which receives the relocation delegation data from the source radio network controller and separates it from the real time traffic, and then transmits non-real time traffic to the terminal through the target SGSN

It includes.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a configuration of a packet network of an asynchronous IMT-2000 for performing RS relocation according to an embodiment of the present invention.

As shown in FIG. 1, the packet network of the asynchronous IMT-2000 for performing RS relocation according to an embodiment of the present invention includes a packet terminal (UE), a UTRAN, and a core network.

The UTRAN includes one or more Node Bs 101, 102 serving as base stations and RNC 103, 104 serving as base station controllers, wherein the RNC 103 connected with Node B 101 is an Iur (RNC-RNC) interface 113. It is connected to the RNC 104 and the Node B (102) through a) to form an access network (Access network).

The core network includes the GGSN 110, which is a connection path between the SGSN 105, 106, which is the subject of the entire network, and the external Internet 111, and has an IP Over ATM (IPOA) to accommodate the Asynchronous Trasfer Mode (ATM) in the lower transport layer. Each node is connected by a switch / router 107 supporting the node, interworking with the external Internet 111 through the GGSN 110, and converting a domain address into an IP (Internet Protocol). Domain Name Server, 108). In addition, the MSC / VLR / HLR 109 corresponding to the circuit network and the circuit network entity for authentication or location information of the subscriber also includes an interface for the subscriber's location information. The MSC / VLR / HLR 109 is a logical entity, and may be physically different nodes, and the following description will be made of the same entity.

The Iu interface 112 is defined between the core network and the RNC 103 and 104, and the Iur interface 113 is defined between the source RNC 103 and the target RNC 104, and the present invention is not limited to the embodiment.

SGSNs 105 and 106 are defined as source SGSN 0 106 and target SGSN 1 105, respectively, and source RNC 103 is placed under management of source SGSN 0 106 and target RNC 104 is targeted SGSN 1. Defined as a structure under the control of 105, the present invention is not limited to the embodiment.

Hereinafter, a method of relocating an RS in a packet network among asynchronous IMT-2000 core networks according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a method of relocating an RS according to an exemplary embodiment of the present invention, and FIG. 3 is a view for explaining a method of relocating an RS according to FIG. 2.

Hereinafter, the state after the soft handover is executed from the source RNC 103 to the target RNC 104 will be described.

First, the source RNC 103 triggers an SRNS relocation (S100). The source RNC 103 transmits a relocation request message to the source SGSN 0 106 (S110). The source SGSN 0 106 receives the relocation request message and transmits the relocation request message to the target SGSN 1 105 (S120).

The target SGSN 1 105 sends a relocation request message to the target RNC 104 to request a RAB (Radio Access Bearer) resource allocation for relocation of the corresponding SRNS based on the received relocation request message. Request a request (S130).

The target RNC 104 recognizes the relocation request sent from the target SGSN 1 105, allocates resources, and places the result thereof in a Relocation Request Acknowledge message to respond to the target SGSN 1 105 ( S140).

The target SGSN 1 105 receives the relocation request recognition message sent from the target RNC 104 and transfers the relocation response to the source SGSN 0 106 by putting the relocation response in the forward relocation response message ( S150).

The source SGSN 0 106 sends a relocation command to the source RNC 103 to inform the source RNC 103 of the relocation resource allocation procedure based on the relocation response received from the target SGSN 1 105 to perform the relocation. (S160). In this case, the relocation command includes information about the target RNC 104 such as an IP (Internet Protocol) address of the target RNC 104, a Tunnel Endpoint ID (GTP-TEID), supportable RAB information, and unsupported RAB information. do.

According to the received relocation command, the source RNC 103 checks whether the current ongoing service is a real time RAB or a non real time RAB (S170). In an embodiment of the invention, a real-time RAB

If the real-time RAB is currently in service, the source RNC 103 continues to transmit and receive the GTP-PDU data with the source packet terminal 107 through the node B 101 (S171).

If the non-real-time RAB is currently in service, the source RNC 103 stops transmitting the GTP-PDU (S180).

The source RNC 103 transmits a relocation commit message to the target RNC 104 through the Iur interface 113 and buffers the GTP-PDU (S190).

The target RNC 104 checks again whether a real-time RAB service is currently performed from the relocation delegation message received from the source RNC 103 (S200). If the real-time RAB service is currently in progress, the target RNC 104 continuously transmits the existing real-time traffic in the PDCP-PDU format to the packet terminal 100.

At this time, if the non-real-time RAB service is being used instead of the real-time RAB from the relocation delegation message received from the source RNC 103, the target RNC 104 performs buffering of the received GTP-PDU (S210).

The target RNC 104 detects the relocation by transmitting a relocation detect message indicating that the RNC is currently performing the service to the target SGSN 1 105 (S220). At this time, the target SGSN 1 105 receives the relocation detection message received from the target RNC 104 and changes the packet data protocol (PDP) context information associated with the RAB information and the RNC information in service. In step S221, the updated PDP context request message is transmitted. The GGSN 110 receives the updated PDP Context request message and transmits a response to the update result to the target SGSN 1 105 (S222).

The target RNC 104 having transmitted the relocation detection message starts to transmit the buffered GTP-PDU data to the packet terminal 100 (S230).

When the relocation is completed, the target RNC 104 transmits a relocation complete result message (Relocation Complete) to the target SGSN 1 105 (S240). The target SGSN 1 105 receives the received relocation completion result message and transmits the relocation completion result to the source SGSN 0 106 (S250).

The source SGSN 0 106 receives and recognizes the received relocation complete result message and responds to the target SGSN 1 105 (S260). The source SGSN 0 106 transmits a RAB Assignment Request message to the source RNC 103 for a release request for the non-real time RAB (S270).

The source RNC 103 receives the RAB assignment request message received from the source SGSN 0 106 to complete the relocation procedure for all SRSNs and sends a RAB assignment response message to the source SGSN 0 106 in response to the RAB release request. It transmits (S280). Source SGSN 0 106 completes the relocation of all SRNS (S290).

As shown in FIG. 3, when the SRNS relocation is performed, real-time traffic passes from the GGSN 110 through the switch / router 107 to the source SGSN 106 and the source RNC 103. After passing through the Iur interface 113 and past the target RNC 104, the node B 102 receives a path from the Node B 102 to the packet terminal 100 (dashed line in FIG. 3). ), Via switch / router 107, via target SGSN 105 and target RNC 104, and via node B 102 to packet terminal 100 via a double-dotted line in FIG. 3. As such, by separating the real-time traffic and the non-real-time traffic, it is possible to minimize the traffic load in the packet network, and to minimize the interference on the real-time traffic and the relocation signaling burden of the SRSN.

The embodiment of the present invention is only one embodiment, and many variations and modifications may be made to the method of relocating the components of the network and the SRNS without departing from the gist of the present invention. It is not limited.

As described above, the RS relocation method and the RS relocation system in the packet network of the asynchronous IMT-2000 communication network of the present invention separate the path of the real time data transmission traffic and the non real time data transmission traffic path for the real time traffic. Latency can be minimized and traffic load balancing effect according to traffic QoS class can be brought.

In addition, the present invention can provide a real-time data transmission service by providing a QoS processing function to the relocation of the Serving Radio Network Subsystem (SRNS) without changing the message and information elements, and is highly portable to an existing network. .

Claims (12)

In a method of relocating an RS from a source radio network controller (RNC) to an target radio network controller of an IMT-2000 packet network including a source SGSN, a target SGSN and a GGSN, and providing a communication service according to the movement of a terminal, Transmitting relocation request data to the source SGSN and receiving relocation resource allocation procedure information from the source SGSN to prepare for relocation; When the preparation for relocation is complete, transmitting relocation delegation data to a target radio network controller to perform relocation detection for notifying the target SGSN that the radio network controller is currently serving the mobile station; Causing the target radio network controller to terminate the relocation after relocation detection; And Releasing a RAB resource according to a RAB resource release request from the source SGSN RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. The method of claim 1, wherein the relocation preparation step Sending relocation request data to the source SGSN; Causing a relocation request according to the relocation request data transfer from the source SGSN to the target SGSN to be delivered to the target radio network controller; Recognizing a result of the relocation request from the target SGSN to the target SGSN is transferred, and receiving a relocation command data from the target radio network controller after receiving a recognition result of the relocation request from the target SGSN to the source SGSN. RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. The method of claim 1, wherein performing the relocation detection Transmitting the relocation delegation data to the target radio network controller; Causing the target radio network controller to send relocation detection data to the target SGSN based on the received relocation commit data; Send the updated packet data protocol content request data from the target SGSN to the GGSN to change the RAB information and the packet data protocol content information related to the information informing the wireless network controller currently in service, and as a result, transmit the data to the target SGSN. Step to receive RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. The method of claim 1, wherein the relocation termination step Sending the relocation completion result data to the target SGSN by the target radio network controller; Transmitting relocation completion result data from the target SGSN to the source SGSN, and receiving relocation completion result data from the source SGSN. RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. The method of claim 1, wherein the RAB resource release step Receiving release request data for a non-real time RAB from the source SGSN; In response to the received non-real-time RAB release request, performing the non-real-time RAB release and transmitting the non-real-time RAB release result data thereof to the source SGSN RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. The method of claim 2, wherein the relocation command data receiving step is Checking whether a data type currently being serviced is a real-time RAB or a non-real-time RAB based on the relocation command data received from the target radio network controller; If the checked data type is a non-real-time RAB, stopping transmission of the GTP-PDU, transferring relocation delegation data to the target radio network controller, and buffering the GTP-PDU. RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. In claim 6, And if the checked transmission data is a real-time RAB, continuing transmitting and receiving GTP-PDU data with the terminal. 4. The method of claim 3, wherein the step of sending relocation detection data to the target SGSN Causing the target radio network controller to check whether the data type currently being serviced from the received relocation mandate data is a non-real time RAB; If the checked data type is a non-real-time RAB, buffering the transmitted GTP-PDU data RS relocation method in the packet network of the asynchronous IMT-2000 communication network comprising a. In claim 8, And if the checked data type is a real-time RAB, sending and receiving PDCP-PDU data from the source radio network data. In an RSN relocation system of an IMT-2000 packet network that provides a communication service according to the movement of a terminal, including a source SGSN, a target SGSN, and a GGSN, In response to occurrence of a relocation event of the currently serving radio network subsystem (SRNS), relocation delegation data is generated according to relocation command data received from the source SGSN, and non-real time in response to a release request for non-real time traffic from the source SGSN. A source radio network controller for releasing traffic and transmitting real-time traffic to the terminal; And A target radio network controller which receives the relocation delegation data from the source radio network controller and separates it from the real time traffic, and then transmits non-real time traffic to the terminal through the target SGSN RS relocation system in the packet network of the asynchronous IMT-2000 communication network comprising a. The method of claim 10, wherein the source radio network controller After the relocation request data is transmitted to the source SGSN, the relocation command data according to the result is received from the source SGSN, and then real-time traffic or non-real time traffic is determined based on the received relocation command data. A system for relocating an RS in a packet network of an asynchronous IMT-2000 communication network, characterized in that data transmission is stopped, buffering data being transmitted, and relocation delegation is performed to the target wireless network controller. The method of claim 10, wherein the target wireless network controller In the packet network of the asynchronous IMT-2000 communication network, data currently in service from the relocation delegation data received from the source radio network controller receives non-real-time traffic, buffers the received non-real-time data, and performs relocation detection. RNS Relocation System.