KR100404179B1 - Method for realizing Link-Mobility among the MSCs in Packet Data Service - Google Patents

Abstract

In the mobile communication system, the present invention relates to an inter-station link mobility realization method for efficiently establishing an inter-switch link according to the mobility of a mobile station in a mobile communication system providing a packet data service, thereby ensuring inter-station mobility for any mobile station. The present invention relates to a method for realizing link mobility between switching stations, by transferring or exchanging information related to a packet data service between switching stations involved in the movement of the mobile station, to maintain a preset point-to-point protocol link before moving the mobile station.

Description

{Method for realizing Link-Mobility among the MSCs in Packet Data Service}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a method for realizing link mobility between exchanges, in which a link between exchanges according to the mobility of a mobile station is efficiently set in a mobile communication system providing a packet data service.

1 is a block diagram showing a configuration of a mobile communication system for a general data service. In this system configuration, if a mobile station (hereinafter, referred to as MS) attempts to access a packet data service according to a service option, FIG. Connect to a default packet data service node (hereinafter abbreviated as PDSN) to establish a point-to-point protocol (hereinafter referred to as PPP) link. Thereafter, the established PPP link releases the link at the MS or PDSN and maintains it until the packet data communication is terminated.

However, if the MS has moved from the service area of the current switching center (hereinafter referred to as MSC) to the service area of another MSC, the radio channel is switched by handoff or roaming, and the PPP is already set. It will break the link and reopen a new PPP link.

In particular, in the case of an MS transitioned from an active state to a dormant state, it is difficult to provide an uninterrupted packet data service because a new PPP link must be reset after releasing a previously established PPP link.

More specifically, since the reconfiguration of the PPP link, the reassignment of the Internet Protocol address, and the re-authentication procedure for the MS are performed according to the mobility of the MS, unnecessary load on the MS and the network side and packet data The probability of loss is increased.

However, the prior art has not been proposed to solve such a problem, and the mobility of the MS to provide a more efficient packet data service should be guaranteed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and particularly when the MS moves from the current MSC's service area to another MSC in a packet data service, a Dormant state If the MS of the MS moves from the current MSC service area to the service area of another MSC, the MSC for packet data service is maintained by maintaining the PPP link with the default PDSN without resetting the PPP link between the MS and the PDSN. It is to provide a suitable method for realizing interlink mobility.

One feature of the method for realizing inter-MSC link mobility for packet data services according to the present invention for achieving the above object is a plurality of MSs, one or more BSS, one or more MSCs for packet data services; In a mobile communication system comprising one or more PDSNs and an HLR, any mobile station in a dormant state with a point-to-point protocol link established is moved from a currently serving first switching area to a serving area of a second switching station. Requesting, by the mobile station, to register a location with the second switching center, performing a location registration of the mobile station by the second switching station according to the location registration request of the mobile station, and registering a location with the second switching center. The first switching center forwarding the information related to the packet data service to the second switching center; And if the mobile station in the idle state transitions to an active state, the second switching station uses the transmitted information to attempt a relay link connection over a point-to-point protocol link established to the mobile station before the mobile station moves. Will.

Another feature of the method for realizing inter-MSC link mobility for packet data services according to the present invention for achieving the above object is a plurality of MSs, one or more BSSs, one or more MSCs for packet data services; In a mobile communication system comprising one or more PDSNs and an HLR, any mobile station in a dormant state with a point-to-point protocol link established is moved from a currently serving first switching area to a serving area of a second switching station. Requesting, by the mobile station, to register a location with the second switching center, performing a location registration of the mobile station by the second switching station according to a request for registration of the mobile station, and registering a location with the second switching center. Afterwards, the packet switching service related information for the mobile station is mutually exchanged between the first switching station and the second switching station. Exchanging, and when the dormant mobile station transitions to an active state, the second exchange station attempts a relay link connection through a point-to-point protocol link established to the mobile station before the mobile station moves using the transmitted information. It is to include the step.

1 is a block diagram showing the configuration of a mobile communication system for a general data service.

2 is a diagram for explaining an embodiment of a method for realizing link mobility between exchanges according to the present invention;

3 is a diagram for explaining another embodiment of a method for realizing link mobility between exchanges according to the present invention;

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

100: mobile station (MS) 200: base station system (BSS)

300: packet data service node (PDSN)

400: Serving exchange / visitor location register (BSC / VLR-B)

500: anchor exchange station / visitor location register (BSC / VLR-A)

600: home location register (HLR)

Hereinafter, a preferred embodiment of a method for realizing inter-MSC link mobility for a packet data service according to the present invention will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a mobile communication system for a general data service.

Referring to FIG. 1, when an MS (not shown) connects to Intranet / Internet with a service option such as a packet data service or a line data service. A point-to-point protocol (hereinafter abbreviated as PPP) link with a Packet Data Service Node (hereinafter abbreviated as PDSN) 13 to 16 is established.

The base station system (hereinafter, abbreviated as BSS) 1 to 5 allocates a radio channel according to the service option of the MS and controls the mobility of the MS. When matching with the network side, the packet data service path and the circuit data service path are separated and controlled.

The mobile switching center (hereinafter abbreviated as MSC) 6, 7, and 8 includes a home location register (hereinafter abbreviated as HLR) 12 and a visitor location register (hereinafter referred to as MSC). It identifies the location registration information of the MS from the VLR (abbreviated as VLR) (9, 10, 11) and serves as a path for data exchange.

The HLR 12 manages the current registered location information of the MS and also manages the information of the PDSNs 13-16. The VLRs 9, 10 and 11 manage location information of MSs registered in their MSCs 6, 7, 8, and PDSNs 13 through 16 whose paths are MSCs 6, 7, 8; Manage information

The connection state of the PPP link established between the MS and the PDSNs 13 to 16 includes an active state, a control hold state, and a suspended state.

The active state is a state in which a traffic channel for packet data transfer is allocated between the MS and the BSSs 1 to 5 and power control can be achieved. In this active state, there is a Dormant state. In the Dormant state, the MS and the PDSN (13 to 16) are simply released when the radio connection between the MS and the BSS (1 to 5) is completely released. Only the PPP link is maintained.

The control hold state is a state in which a traffic channel is not allocated between the MS and the BSSs 1 to 5, and only a channel and a control channel for power control are allocated. When data to be delivered occurs when this control hold state is present, it is possible to quickly resume packet data transmission between the MS and the BSSs 1 to 5.

The suspended state is a state in which the power control channel and other control channels that were held in the control hold state are released, and only a link is maintained between the MS and the BSSs 1-5.

By using such a system configuration, the present invention proposes two methods of managing or transferring information related to packet data service between MSCs so as to realize link mobility between MSCs.

One of them is to transmit and manage service information in one direction, and the other is to exchange and manage service information in both directions.

2 is a diagram illustrating an embodiment of a method for realizing link mobility between MSCs according to the present invention, and uses a method of transmitting and managing service information in the above-described one-way direction.

According to FIG. 2, the MS 10 initiates a packet data service at the MSC-A 50 to establish a connection with the PDSN 30 and the PPP link, and then moves from the Dormant state to the MSC-B 40. When moving, the MSC-B 40 transmits an identifier (ID: Identifier) of the serving PDSN 30 in which the PPP link is established with the MS 10 and the packet data service of the MS 10 to the MSC-B 40. By managing it, link mobility between MSCs 40 and 50 can be realized.

A more detailed description thereof will be described below.

In the present invention, the information transferred between the MSCs 40 and 50 includes an identifier (ID), a packet data service state, and a quality of service (QoS) of the serving PDSN 30 in which the MS 10 has established a PPP link before moving. of Service) and service options, etc., so that this information is maintained only in the MSC-A 50 where the MS 10 is currently located.

Here, the packet data service state of the MS 10 may be in an active state and an inactive state, and in the case of an active state, a dormant state exists.

First, when the MS 10 is located in the area of the MSC-A 50, the packet data service is started to establish a PPP link connection with the PDSN 30 (S1).

At this time, the MSC-A 50 identifies the identifier (ID) of the PDSN 30, the packet data service status, and service related information (QoS, Service Options) for the MS 10 (hereinafter, referred to as serving information). Is saving.

After the MS 10 transitions to the Dormant state, and then moves from the MSC-A 50 to the MSC-B 40, the MS 10 requests the MSC-B 40 to register a location. (S2).

The MSC-B 40 detects the location registration of the MS 10 and sends a 'RegNot INV' message (Registraion Notification INVOKE MAP message) for notifying the registration request of the MS 10 to the HLR 60 (S3).

At this time, the HLR 60 sends a 'RegCan INV' message (Registration Cancellation INVOKE MAP message) to the MSC-A 50 for deregistration of the MS 10 (S4).

Accordingly, when the MSC-A 50 receives the 'RegCan INV' message and the serving information for the MS 10 exists, the MSC-A 50 places the serving information in a 'RegCan RET' message (Registration Cancellation RETURN RESULT MAP message). Send to the HLR (60) (S5), and deletes the serving information for the MS (10) stored in itself.

The HLR 60 transmits the serving information included in the message to the MSC-B 40 again in a 'RegNottration Notification RETURN RESULT MAP message' (S6).

After receiving the 'RegNot RET' message, the MSC-B 40 stores serving information for the corresponding MS 10 when serving information required for the received message exists.

At this time, when the MS 10 in the Dormant state transitions to the active state, the MS 10 is configured with a default PDSN (not shown) previously defined in the MSC-B 40. Without resetting the PPP link, a relay link connection is attempted to the serving PDSN 30 where the PPP link has already been established (S7 to S9).

Then, if the MS 10 moves from the Dormant state back to any other MSC-C (not shown), the above-described procedures (S2 to S6) are carried out in the MSC-B 40 and the MSC-C (not shown). You can repeat the process).

3 is a diagram for explaining another embodiment of a method for realizing link mobility between exchanges according to the present invention, and uses the aforementioned method of exchanging and managing service information in both directions.

According to FIG. 3, the MS 100 initiates a packet data service to establish a connection with the serving PDSN 300 and the PPP link, and then moves from the Dormant state to the MSC-B 400 in another service area. At the same time, the MS 100 delivers the main information related to the packet data service of the MS 100 to the MSC-B 400 that has moved, and at the same time, the identifier of the MSC-B 400 where the MS 100 is currently located after the movement. By passing the ID to the MSC-A 500 that initiated the initial service, the current serving MSC-B 400 for the MS 100 and the anchor where the MS 100 opened the first PPP link. Enable relay link connections on both sides of the MSC-A 500.

Therefore, link mobility between MSCs can be realized, and a detailed description thereof will be described below.

In the present technology, the information transmitted to the MSC-B 400 includes an identifier (ID) of the serving PDSN () in which the MS 100 has set up the PPP link before moving, and the MS 100 starts the service to establish a PPP link. The identifier (ID), packet data service status, quality of service (QoS) and service options of the anchor MSC-A 500 first formed (hereinafter, referred to as serving information in the following procedure). The information is kept only in the MSC-A 500 where the MS 100 is currently located.

In addition, information transmitted from the current serving MSC-B 400 to the anchor MSC-A 500 may include an International Mobile Station Identifier (IMSI) and a mobile identification number (MIN). The identifier (ID) of the same MS 100, the identifier (ID) of the serving MSC-B 400 in which the current MS 100 is located, and the service link on the BSS 200 to which the current MS 100 can communicate. Addresses (Service Link Address) and the like (abbreviated as anchor information in the following procedure), and these anchor information are stored and held in the anchor MSC-A 500.

In addition, the anchor MSC-A 500 further stores an identifier (ID) of the serving PDSN 300.

First, when the MS 100 is located in the area of the anchor MSC-A 500, the packet data service is started to establish a PPP link connection with the serving PDSN 300 (S10).

At this time, the anchor MSC-A 500 stores serving information about the MS 100.

After the MS 100 transitions to the Dormant state and moves from the anchor MSC-A 500 to the serving MSC-B 400, the MS 100 is located at the serving MSC-B 400. Request registration (S20).

The serving MSC-B 400 detects the location registration of the MS 100 and sends a 'RegNot INV' message (Registraion Notification INVOKE MAP message) to inform the HLR 600 of the registration request of the MS 100 (S30). .

At this time, the HLR 600 sends a 'RegCan INV' message (Registration Cancellation INVOKE MAP message) to the anchor MSC-A 500 to unregister the MS 100 (S40).

Accordingly, after receiving the 'RegCan INV' message, the anchor MSC-A 500 sends the serving information to the 'RegCan RET' message (Registration Cancellation RETURN RESULT MAP message). Send it to the HLR (600) (S50), and deletes the serving information for the MS (100) stored in itself.

In addition, the anchor MSC-A 500 preferentially stores the identifier (ID) of the corresponding MS 100 and the identifier (ID) of the serving PDSN 300 in its relay database.

The HLR 600 loads the serving information included in the message and delivers it back to the serving MSC-B 400 in a 'RegNottration Notification RETURN RESULT MAP message' (S60).

After receiving the 'RegNot RET' message, the serving MSC-B 400 stores serving information for the corresponding MS 100 when serving information required for the received message exists.

At this time, the serving MSC-B 400 observes the identifier (ID) of the anchor MSC-A 500 of the MS 100, and then provides the anchor information of the MS 100 existing in the MS 100 with a 'LinkNot INV'. The message (Link Notification INVOKE message) is carried on the anchor MSC-A (500) (S70).

When the anchor MSC-A 500 receives the 'LinkNot INV' message and the identifier (ID) of the MS 100 included in the received anchor information exists in its relay database, the serving MSC-B which is the remaining anchor information An identifier (ID) of 400 and a service link address on the BSS 200 to which the current MS 100 can communicate are stored.

At this time, when the MS 100 in the Dormant state transitions to the active state, the MS 100 sets a default PDSN (not shown) in the serving MSC-B 400. Instead of resetting the PPP link, a relay link connection is attempted to the serving PDSN 300 where the PPP link has already been established (S80 to S100).

However, if the incoming attempt from the network side through the serving PDSN 300 occurs before the relay link connection to the serving PDSN 300 through the serving MSC-B 400 to the MS 100 is successful, the anchor MSC- A 500 observes the identifier (ID) of the serving MSC-B 400 stored in its relay database and the service link address on the BSS 200 to which the current MS 100 can communicate. After that, the relay link is connected to the corresponding service link address.

Thereafter, even when the MS 100 moves from the Dormant state back to any other target MSC-C (not shown), the above-described procedures (S20 to S70) may be performed using the MSC-B 40 and the MSC-C ( It may be repeated for (not shown).

As described above, in the present invention, when the MS moves from the service area of the current MSC to the MSC of another service area while receiving the packet data service, in particular, the MS in the dormant state is the current MSC service area. When moving from the MS to the service area of another MSC, there is an effect that the service can be provided without disconnection by managing or transmitting or exchanging necessary service related information between the MSCs without resetting the PPP link between the MS and the PDSN.

In addition, since the present invention does not require resetting of the PPP link, reassignment of the Internet Protocol address, and reauthentication procedure for the MS according to the mobility of the MS, the unnecessary load on the MS and the network side is reduced. In addition, the possibility of packet data loss can be minimized.

Claims (2)

A mobile communication system comprising a plurality of mobile stations, one or more base stations, one or more switching stations, one or more packet data service nodes, and a home location register for packet data services, Requesting, by the mobile station, location registration from the first switching center area from which the point-to-point protocol link is established to the service area of the second switching station as it is currently in service; Performing location registration by the second switching station according to the location registration request of the mobile station; Forwarding, by the first switching station, information related to the packet data service to the second switching station after the location registration with the second switching center is completed; When the dormant mobile station transitions to an active state, the second switching station attempts to use a relay link connection over a point-to-point protocol link established to the mobile station before the mobile station moves using the transmitted information; A method for realizing link mobility between switching stations. A mobile communication system comprising a plurality of mobile stations, one or more base stations, one or more switching stations, one or more packet data service nodes, and a home location register for packet data services, Requesting, by the mobile station, location registration from the first switching center area from which the point-to-point protocol link is established to the service area of the second switching station as it is currently in service; Performing location registration of the mobile station by the second switching station according to the request for registration of the mobile station; Exchanging the packet data service related information for the mobile station between the first switching station and the second switching station after the location registration with the second switching center is completed; When the dormant mobile station transitions to an active state, the second switching station attempts to use a relay link connection over a point-to-point protocol link established to the mobile station before the mobile station moves using the transmitted information; A method for realizing link mobility between switching stations.