KR100635505B1 - Method for delivering messages between a serving access control router and a target access control router at the time of occurring an hand-over between the serving access control router and the target access control router in a wibro network - Google Patents

Abstract

A message transmission method during handover between ACRs(Access Control Routers) in a WiBro(Wireless Broadband) network is provided to be capable of simplifying a procedure for transmitting a message transceived between a serving ACR and a target ACR, when handover between the ACRs occurs in the WiBro network, thus call processing time is saved. As a message generated from a PSS(Portable Subscriber Station)(300) is delivered to an RAS(Radio Access Station)(250), the RAS(250) delivers the received message(A-interface message) to a target ACR(200)(S10-S12). A routing module of the target ACR(200) senses messages that a serving ACR(100) has to receive, and sends the messages to a routing module of the serving ACR(100)(S16). The routing module of the serving ACR(100) sends the messages to a call processing module(S18). The call processing module performs a call processing function through the same processing procedure(S20). The call processing module transmits the A-interface message to the routing module irrespective of a position of the RAS(250)(S22), and the routing module transmits the message to the routing module of the target ACR(200)(S24). The routing module of the ACR(200) immediately transmits the routed A-interface message to the RAS(250)(S26). The RAS(250) transmits the message to the PSS(300)(S28).

Description

Method for delivering messages between a serving access control router and a target access control router at the time of occurring an hand-over between the serving access control router and the target access control router in a WiBro Network}

1 is a schematic configuration diagram of a WiBro network to which a message delivery method according to the present invention is applied;

FIG. 2 is a block diagram illustrating a message delivery method according to the present invention in the WiBro network shown in FIG. 1.

<Description of Symbols for Main Parts of Drawings>

ACR: Access Control Router

PSS: Portable Subscriber Station

RAS: Radio Access Station

LMS: Location Management Server

100: Serving ACR 150: Old Anchor RAS

200: Target ACR 250: New Anchor RAS

300: portable subscriber station targeted for handover

The present invention relates to a method for delivering a message during handover in a WiBro network, wherein a handover target portable subscriber is previously performed when a handover occurs between an access control router (ACR) in the WiBro network. Message transmission between the Radio Access Station (RAS) as the Old Anchor, which was in charge of the terminal, and the Radio Access Station (RAS), as the New Anchor, which is in charge of the new handover target subscriber terminal. The present invention relates to a message transfer method during handover between access control routers in a WiBro network capable of minimizing the error.

Currently, the global wireless Internet market is exploding and Korea is also providing high-speed wireless data services such as WLAN, CDMA 2000, 1x EV-DO, and WCDMA. As of the end of 2003, the sales of wireless internet accounted for 14% of the total sales of domestic mobile phones. However, wireless internet services using mobile phones are limited in speed due to low speed and relatively high usage rates. In this case, the speed is relatively high, but mobility is not guaranteed, and the radius of use is narrow, which also shows a limit to the activation of distribution. Therefore, there is a need for high-speed, relatively inexpensive wireless Internet service.

As a result, a new service called WiBro (Wireless-Broadband) has been proposed. This WiBro service will provide mobility [Handover] service in wide coverage (cell radius of about 1Km) and on the move (60Km / h) and provides a transmission rate of about 1Mbps per subscriber. . WiBro service is a service that enables data communication through internet connection like wireless LAN, and long distance communication like mobile phone, and can be called 'mobile internet'. The frequency band of WiBro service is allocated at 2.3Ghz, and the service bandwidth (ie internet speed) will be ADSL level communication of about 1Mbps or more.

The WiBro service aims to start commercial service in Korea in about 2006. The number of base stations (approximately 1.2-1.5 times compared to current CDMA networks) or mobile speeds (approximately 60 km) is slightly lower than the EV-DO services available on current CDMA mobile phones, but with cost advantages. will be.

As shown in FIG. 1, the WiBro network includes a portable subscriber station (PSS), a radio access station (RAS), and an access control router (ACR). And a Location Management Server (LMS).

The portable subscriber station (PSS) is a subscriber portable terminal such as a laptop, a mobile phone, and a personal digital assistant (PDA) equipped with a modem for data communication connection in a WiBro network. The service access function, the IP mobility function, the multicast service reception function, and the other network interworking function may be provided.

The radio access device (RAS) is a network termination device for the portable subscriber station (PSS) to access the network, and the wireless wireless access function, handover support function, radio resource management and control function of the portable subscriber station (PSS) And a downlink multicast function.

The access control router (ACR) is a device that is linked to and manages a plurality of radio access devices (RAS), including IP routing and mobility management functions, authentication and security functions of the portable subscriber station (PSS), IP multicast function, And a billing function, a handover control function between the radio access devices (RAS), a resource management and control function, and the like.

The location management server (LMS) is located above the access control router (ACR), service and information management of the portable subscriber station (PSS), location information management of the portable subscriber station (PSS), portable subscriber station (PSS) subscriber It may be provided with a termination and pause function.

In the related art, a handover occurs between the access control routers ACR_1 and ACR_2 as a predetermined portable subscriber station under communication management in the access control router ACR_1 enters a communication jurisdiction of another access control router ACR_2. Thus, when the handover target portable subscriber station enters the jurisdiction of the radio access device RAS, which is a new anchor under the jurisdiction of the handover target access control router ACR_2, the access control router ACR_1. It is necessary to update the information on the access control router between (ACR_2), where the contexts for the portable subscriber station are present in the previous access control router (hereinafter referred to as "serving ACR"). do. In this case, an A-Interface Message from the New Anchor Radio Access Device (RAS) for basic call processing; wherein the interface between the Radio Access Device and the access control router is called an "A-Interface". Are referred to as a new access control router (hereinafter referred to as "Target ACR"), but the target access control router has no information about the subscriber and sends incoming messages to the serving access control router. There is a need to do it. This is a matter that is applied before performing the mobile IP when the portable subscriber station targeted for the handover uses the simple IP.

At this time, the same number of IR-interface messages as the A-interface message [Interactive Response (IR) -Interface Message; An interface between access control routers is called an "IR-interface"], and an algorithm for its processing is needed.

Therefore, conventionally, when a handover occurs between access control routers, a large number of messages are transmitted between a serving access control router (Serving ACR), a target access control router (Target ACR), and a new anchor (Radio Access Device) (RAS). Since there is a need to give and receive, there is a problem that the procedure for call processing is very complicated when handover occurs between access control routers.

Accordingly, the present invention has been made to solve the above-described problems of the prior art, and is provided between a serving access control router (Serving ACR) and a target access control router (Target ACR) when a handover occurs between access control routers in a WiBro network. An object of the present invention is to provide a method for delivering a message during handover between access control routers in a WiBro network that can simplify the procedure of delivering a received message.

In order to achieve the above object, a message transfer method in a handover between access control routers according to the present invention is to perform data communication with a portable subscriber station for a wireless data communication connection and a portable subscriber station in its own jurisdiction. In a WiBro network including a wireless access device and an access control router linked to and managing the plurality of wireless access devices, a predetermined mobile subscriber station communicates through a first wireless access device under the jurisdiction of the first access control router, A message transfer method when a handover occurs between a first access control router and a second access control router upon entering an area of a second wireless access device under the jurisdiction of a second access control router; When the message is received by the routing module of the second access control router from the handover target mobile subscriber station through the second wireless access device, the routing module checks the state of the access control router of the handover target mobile subscriber station with respect to the message. A first step; As a result of the checking in the first step, when the access control router state of the handover target portable subscriber station is set to the second access control router, the routing module of the second access control router sends the received message to the first access control router. And a second step of routing to the routing module.

Here, in the handover between access control routers according to the present invention, the message forwarding method may include a message received by the routing module of the first access control router that receives the message by the routing process from the routing module of the second access control router. Sending a to the call processing module; In a call processing module of the first access control router, performing a call processing on the corresponding received message, and then transferring the call processing result message to the routing module of the first access control router; If the routing module of the first access control router determines that the second wireless access device that attempts to transmit the message received from the call processing module belongs to the second access control router, the routing module of the first access control router sends the message to the routing module of the second access control router. A fifth step of transmitting; The routing module of the second access control router that receives the message in the fifth step includes a sixth step of transmitting the received message to the handover target mobile subscriber station through the second wireless access device. It is done.

Hereinafter, a message forwarding method in handover between access control routers according to a preferred embodiment of the present invention will be described in detail.

1 is a schematic configuration diagram of a WiBro network to which a message delivery method according to the present invention is applied, and FIG. 2 is a block diagram illustrating a message delivery method according to the present invention in the WiBro network shown in FIG. 1.

As shown in the figures, the WiBro network includes a portable subscriber station (PSS), a radio access device (RAS), an access control router (ACR), and a location management server (LMS). The description of the components and the description of the sector have been described in the above-described prior art section, and thus description thereof is omitted here.

2 shows a hand between the access control router 100 and the access control router 200 as the mobile subscriber station 300 enters the jurisdiction of the wireless access device 250 after being in the jurisdiction of the wireless access device 150. FIG. Is a diagram illustrating a case in which an over occurs, in which the radio access device 150 is an old anchor, the radio access device 250 is a new anchor, and access control. The router 100 is called a serving access control router and the access control router 200 is called a target access control router.

As shown in the figure, the access control router 100, 200 includes a subscriber context management module and routing information for managing subscriber contexts for all subscriber portable terminals managed by the access control router 100, 200, and signaling data. It includes a routing module for routing the network, a handover management module for managing handover related information, and a call processing module for performing call processing.

In the WiBro network configured as described above, when the mobile subscriber station 300 enters the jurisdiction of the wireless access device 250 after entering the jurisdiction of the wireless access device 250, the access control router 100 and the access control router ( When a handover occurs between 200), a detailed signal flow procedure of a message transfer method when handover between access control routers according to the present invention will be described with reference to FIG. 2.

First, message routing in the target access control router 200 will be described.

That is, as the message generated from the handover target mobile subscriber terminal 300 is delivered to the wireless access device 250 which is the new anchor, the wireless access device 250 that receives the message is received by the target access control router 200. The message (A-interface message) is delivered (steps S10 to S12).

When a message is received by the routing module from the handover target portable subscriber station 300 via the wireless access device 250 via the wireless access device 250, the corresponding routing module displays the context ( Context) is retrieved from the subscriber context management module to check the state of the access control router (ACR) of the mobile subscriber station 300 (step S14). Here, since the ACR handover is made, the access control router (ACR) state of the portable subscriber station 300 is determined to be the target access control router 200.

If it is determined in step S14 that the access control router (ACR) status of the portable subscriber station (PSS) 300 is the target access control router 200, the target access control router 200 includes the corresponding portable subscriber station 300. There is no information on subscribers, so basic call processing cannot be done.

Therefore, in the target access control router 200, the A-interface messages for all basic call processing should be transferred to the IR access messages to the serving access control router 100, and in the serving access control router 100, After receiving the IR-interface messages, perform appropriate processing, and then convert the IR-interface message, not the A-interface message, and deliver it to the target access control router 200. The target that receives the IR-interface message Since the access control router 200 converts the A-interface message back to the A-interface message and delivers it to the corresponding handover target mobile subscriber terminal 300 via the wireless access device 250, the structure becomes very complicated in message delivery. Has

In order to solve this problem, in the present invention, the target access control router 200 detects messages that the serving access control router 100 must receive in the routing module that routes the message to each call processing module [portable to the corresponding handover target]. If the context of the subscriber terminal 300 is set to the target access control router 200] it is not sent to the call processing module but to the routing module of the serving access control router 100 (step S16). The routing module 100B of the serving access control router 100 sends this to the call processing module (step S18).

The call processing module of the serving access control router 100 has the same processing procedure [new anchor radio access device 250 in the radio access device attached to its network without having to detect where the message comes from. Call processing is carried out as in step S20.

Next, a procedure of transmitting a message from the serving access control router 100 to the wireless access device 250 belonging to the target access control router 200 will be described.

That is, when performing a call processing in the call processing module of the serving access control router 100 and then attempts to transmit an A-interface message to the wireless access device 250 belonging to the target access control router 200, the corresponding wireless access. If the device 250 belongs to the target access control router 200, the device 250 converts it into an IR-interface message instead of an A-interface message, and transmits the message to the target access control router 200, and the message is again sent by the target access control router 200. It should be converted to an A-interface message and sent to the wireless access device 250. This not only introduces delays in message transmission, but also complicates software.

Therefore, in order to solve this problem, in the present invention, the call processing module of the serving access control router 100 transmits to the routing module regardless of the location of the wireless access device 250 (step S22), and the routing module transmits a message. If it is determined that the radio access device 250 to be belonged to the access control router 200 is transmitted to the routing module of the target access control router 200 (step S24).

The routing module of the target access control router 200 directly transmits the routed A-interface message received from the serving access control router 100 to the corresponding wireless access device 250 (step S26).

Thereafter, the wireless access device 250 transmits the message received from the routing module of the target access control router 200 to the corresponding handover target mobile subscriber terminal 300 (step S28).

Through the above signal processing, call processing time can be saved, and the software structure of the call processing module can be simplified.

On the other hand, the present invention is not limited to the above-described specific embodiments, it can be carried out by various modifications and modifications within the scope not departing from the gist of the present invention, the claims to which such modifications and modifications are attached If it is included in the obvious that it belongs to the present invention.

As described above, according to the present invention, when a handover occurs between access control routers in a WiBro network, when a message is received from the handover target mobile subscriber station via a wireless access device that is a new anchor, the routing module of the target access control router receives a message. If the access control router status of the handover target mobile subscriber station is a target access control router, the routing module of the target access control router routes the received message to the routing module of the serving access control router, and the serving access control router. When a message is sent to the corresponding handover target subscriber station, it is determined that the wireless access device, which is a new anchor of the corresponding handover target subscriber terminal, is under the jurisdiction of the target access control router. Since the message is transmitted to the routing module of the control router, the routing module of the target access control router is configured to deliver the received message directly to the handover target mobile subscriber terminal through the wireless access device. Since the procedure of transmitting and receiving messages between the Serving ACR and the Target Access Control Router (Target ACR) can be simplified, call processing time can be saved.

Claims (2)

WiBro including a portable subscriber station for wireless data communication connection, a wireless access device for performing data communication with a portable subscriber station in its jurisdiction, and an access control router linked to and managing the plurality of wireless access devices. In a network, a first mobile access terminal communicates through a first wireless access device under a jurisdiction of a first access control router and enters an area of a second wireless access device under a jurisdiction of a second access control router. A message transfer method when a handover occurs between a router and a second access control router; When the message is received by the routing module of the second access control router from the handover target mobile subscriber station through the second wireless access device, the routing module checks the state of the access control router of the handover target mobile subscriber station with respect to the message. A first step; As a result of the checking in the first step, when the access control router state of the handover target portable subscriber station is set to the second access control router, the routing module of the second access control router sends the received message to the first access control router. And a second step of routing to a routing module. The method of claim 1, In a routing module of the first access control router which receives the message by the routing process from the routing module of the second access control router, sending a corresponding received message to the call processing module; In a call processing module of the first access control router, performing a call processing on the corresponding received message, and then transferring the call processing result message to the routing module of the first access control router; If the routing module of the first access control router determines that the second wireless access device that attempts to transmit the message received from the call processing module belongs to the second access control router, the routing module of the first access control router sends the message to the routing module of the second access control router. A fifth step of transmitting; The routing module of the second access control router that receives the message in the fifth step includes a sixth step of transmitting the received message to the handover target mobile subscriber station through the second wireless access device. Message passing method during handover between access control routers in a WiBro network.

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