WO2007033558A1

WO2007033558A1 - Method and device of handvoer cancel process in wireless access network

Info

Publication number: WO2007033558A1
Application number: PCT/CN2006/001798
Authority: WO
Inventors: Jing Chen; Liping Yuan; Yan Zhou
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-09-24
Filing date: 2006-07-21
Publication date: 2007-03-29
Also published as: CN100450023C; CN1863079A

Abstract

A method and device of handover cancel process in wireless access network in network communication technical field implement the restore of related network resource in time after handover cancel by transmitting handover cancel indication to every entity which needs to cancel handover operation in handover flow and completing handover cancel operation by every entity. The present invention implements complete restore of related network resource after handover cancel operation by transmitting handover cancel indication to every function entity which needs to cancel handover operation and perform cancel operation step by step.

Description

Wireless access network switching cancellation processing method and device

Technical field

The present invention relates to the field of network communication technologies, and in particular, to a wireless access network handover cancellation processing method and apparatus.

Background of the invention

With the rapid development of Internet services and the widespread use of wireless networks, WiMA (Worldwide Interoperability for Microwave Access) systems have received a great deal of application and attention with their good wireless access characteristics. How WiMAX systems are applied to mobile users, and better provision of packet forwarding or routing between networks and mobile users has become a new research in the industry.

The following takes the WiMAX network architecture system shown in Figure 1 as an example to illustrate the functions of each network element in a WiMAX wireless access system using wireless access technology:

In Fig. 1, the WiMAX radio access system includes an MSS/SS (Mobile Subscriber Station), an ASN (Access Service Network), and a CSN (Connected Service Network).

The MSS is a mobile user equipment, and the SS is a user equipment, and the user uses the device to access the WiMAX network.

The ASN includes a BS (Base Station) and an ASN-GW (Access Service Network Gateway) and the like, and is used to provide a WiMAX terminal device with a network function set of a radio access service. For example, providing connectivity between BS and MSS/SS, radio resource management, measurement and power control, compression and encryption of air interface data based on the BS; MSS/SS authentication, authorization, and accounting based on the ASN-GW The function provides proxy (proxy) function, network discovery and selection that supports NSP, relay function (such as IP address allocation) that provides L3 information for MSS/SS, and wireless resource management.

The CSN is used to provide an IP connection service for the WiMAX terminal. For example, assigning an IP address to the MSS/SS, providing Internet access, providing an AAA proxy or server, providing user-based authorization control, and providing an ASN to CSN tunnel, equivalent to HA (home agent) in mobile IP technology, providing WiMA User billing and settlement between operators, tunneling between CSNs in roaming, handover between different ASNs, and various WiMAX services (such as location-based services, multimedia multicast and broadcast services, IP multimedia sub- System business) and so on.

The MS used for MSS/SS access is called a serving BS. For an MSS/SS that is accessed by a certain serving BS, an ASN-GW with an R6 interface with the BS is called a service ASN-GW. For example, ASN-GW1 in FIG. 1 is a service ASN-GW of MSS/SS accessed using BS1 or BS2. The ASN-GW providing the R3 interface between R3 of the HA from the ASN to the CSN is called the anchor ASN-GW, and the anchor ASN-GW in FIG. 1 is a logical entity, which can be associated with ASN-GW1, ASN in FIG. - Logical entities such as GW2 exist in the same or different physical entities. When the anchor ASN-GW and the serving ASN-GW exist in the same physical entity, the interface between the two belongs to the internal interface of the device, and the standard R4 interface does not have to be used.

The process of data transmission between network elements will be described below with reference to FIG. 1:

The downlink MSS/SS packet service datagram is transmitted from the HA of the CSN to the ASN through the R3 interface between the HA and the anchor ASN-GW in the ASN. After the downlink service datagram of the MSS/SS enters the ASN, it is transmitted to the serving ASN-GW of the MSS/SS through the R4 interface inside the ASN, and the RSN interface between the ASN-GW and the BS through the ASN of the service ASN-GW. The R1 interface between the BS and the MSS/SS transmits the MSS/SS data to the MSS/SS.

The upstream data is passed from the MSS/SS to the CSN along the opposite path and reaches the peer user. As described above, in the internal interface of the ASN, there is a corresponding uplink and downlink data path for each service flow of each MSS/SS, and each service flow is established according to the QoS requirements of each service flow and The way the data path is adopted is established. When the business ends, that is, when the business flow is aborted, the corresponding data path needs to be released.

When the MSS/SS may move from the coverage area of one BS to the coverage area of another BS during the move, the service

When the BS and the target BS belong to the same ASN-GW, the handover that occurs is called R6 interface mobility switching. As shown in Figure 2, the MSS/SS uses BS2 to access the network before the R6 interface is switched. Figure 3 shows that after the R6 interface is switched, the MSS/SS uses BS1 to access the network.

When the MSS/SS may move from the coverage area of one BS to the coverage area of another BS during the mobile, and the serving BS and the target BS belong to different ASN-GWs, the handover that occurs is referred to as R4 interface mobility switching. Before the R4 interface is switched, as shown in Figure 2, after the R4 interface is switched, as shown in Figure 4, the MSS/SS uses BS3 to access the network. It can be seen that the MSS/SS passes between the new service ASN-GW and the anchor ASN-GW. The established R4 interface data path is used for data transfer.

During the handover process, the handover operation is usually cancelled at any time for some reasons. The prior art process cancels the operation process, and usually sends a cancellation indication to the service BS, instructing the service BS to cancel the handover operation.

The above-mentioned technical disadvantages are that the cancellation indication of the transmission only defines the cancellation of the air interface, and does not specify the specific cancellation behavior of the access service network, which may result in the related resources being not released or delayed, resulting in waste of network resources. Summary of the invention

An object of the present invention is to provide a method and apparatus for canceling a radio access network handover cancellation. The handover cancellation instruction is sent to each entity in the handover procedure that needs to cancel the handover operation, and the handover cancellation operation is completed by each entity, thereby achieving handover cancellation. After that, related network resources are restored in time. The object of the invention is achieved by the following technical solutions:

A wireless access network switching cancellation processing method includes:

The handover cancellation indication is sent to the entity that needs to cancel the handover operation, and the handover cancellation operation is performed by the entity, and the resource state before the handover operation is restored. '

The method specifically includes:

A. The mobile user equipment MSS/SS sends a handover cancellation indication to the functional entity that needs to cancel the handover operation;

B. After receiving the handover cancellation indication, the function entity that needs to cancel the handover operation sends the handover cancellation indication to the next functional entity that needs to cancel the handover operation, and restores the resource state before the handover operation, according to which, until The last functional entity to which the switching operation has been completed and needs to be cancelled.

The functional entities that need to cancel the switching operation include:

Service switching function entity: The original operation entity of the switching operation;

and / or,

Transfer switching function entity: switch operation base point;

and / or,

Target switching function entity: switching operation target entity;

The functional entity includes: a base station BS and/or an access service network gateway ASN-GW.

The step B includes:

Bl. After receiving the handover cancellation indication, the function entity that needs to cancel the handover operation stops the related timer used by the handover process.

The step B includes:

B2. Determine that the data path between the service switching function entity and the transit switching function entity has been released, and establish the data path.

The step B includes:

B3. Determine that a data path between the transit switching function entity and the target switching function entity has been established, and release the data path.

The step B includes:

B4. After the air interface link is established between the target switching function entity and the MSS/SS, the air interface link is released.

The information carried in the handover cancellation indication includes: Cancellation reason, MSS/SS identification, MSS/SS information, target switching function entity information, and/or specific switching operation information that needs to be canceled.

A radio access network handover cancellation processing apparatus is set in each entity of a radio access network:

And a switching cancellation indication module, configured to send a handover cancellation indication to the next functional entity that needs to cancel the handover operation according to an actual requirement;

The switching cancellation execution module is configured to cancel the switching operation that has been performed according to the received switching cancellation instruction. The device is also provided with:

The switching state determining module is configured to determine whether the current entity has performed the switching operation, and use the determination result as a basis for the switching cancellation execution module to perform the canceling switching operation.

As can be seen from the technical solution provided by the present invention, the present invention performs a step-by-step cancellation operation by gradually transmitting a handover cancellation indication to each functional entity of the switching operation, thereby realizing timely and complete recovery of related network resources after the handover cancellation operation.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a prior art WiMAX network architecture system;

2 is a schematic diagram of a prior art interface switching;

3 is a schematic diagram of a prior art R6 interface switching;

4 is a schematic diagram of a prior art R4 interface switching;

Figure 5 is a schematic diagram showing the operation of the method of the present invention;

6 is a flowchart of canceling a switch of an R6 interface according to the method of the present invention;

FIG. 7 is a flowchart of canceling the R4 interface switching according to the method of the present invention.

Mode for carrying out the invention

The core idea of the present invention is to provide a radio access network handover cancellation processing method and apparatus, and send a handover cancellation indication to each entity in the handover procedure that needs to cancel the handover operation, and complete the handover cancellation operation by each entity, thereby implementing handover cancellation. After that, the relevant network resources are restored in a timely and complete manner.

The present invention provides a radio access network handover cancellation processing method. In the handover cancellation operation, the method according to the present invention can send a handover cancellation indication to each entity that needs to cancel the handover operation, and this embodiment cancels the system. For example, the entity that performs the switching operation is used as an example to describe the handover cancellation operation. The actual operation process can only cancel the handover operation of some of the entities. The MSS/SS sends the handover cancellation indication as an example. As shown in Figure 5, the method specifically includes The following steps:

Step 1: The MSS/SS sends a handover cancellation indication to the service handover function entity; During the execution of the handover operation, the handover operation may be cancelled at any time for some reason, and the MSS/SS sends a handover cancellation indication to the service handover function entity, where the service handover function entity is the original use entity of the handover operation, that is, the work entity before the handover operation, For BS or ASN-GW;

Step 2: The service switching function entity stops the related timer used by the switching operation, and sends a switching cancellation indication to the switching switching function entity, where the switching switching function entity is a switching operation base point, that is, an entity commonly used before and after the switching operation, The switch or the ASN-GW; the handover cancellation indication carries: cancel reason, MSS/SS identifier, MSS/SS information, target handover function entity information, specific handover operation that needs to be canceled, etc.; service handover function entity receives After the foregoing handover cancellation indication, stopping the related timer used by the handover procedure, forwarding the handover cancellation indication to the transit handover function entity, and restoring the resource state before the handover procedure; if the service handover function entity and the transit handover function entity After the data path has been released, step 3 is performed;

Step 3: Establish a data path between the service switching function entity and the transit switching function entity;

Step 4: After receiving the handover cancellation indication, the transit switching function entity stops the related timer used by the handover operation, forwards the handover cancellation indication to the target handover function entity, and restores the resource state before the handover operation; The switching function entity is a switching operation target entity, that is, a function entity used after the switching operation, which may be a BS or an ASN-GW; if a data path has been established between the transit switching function entity and the target switching function entity, step 5 is performed;

After receiving the handover cancellation indication, the target handover function entity stops the related timer used by the handover operation, and restores the resource state before the handover operation; if an air interface link is established between the target handover function entity and the MSS/SS, the execution is performed. Step 6;

Step 5: Release the data path between the transfer switching function entity and the target switching function entity;

Step 6: Release the air interface link between the target switching function entity and the MSS/SS, and the switch cancel operation is completed. The above-mentioned handover canceling operation is implemented in the case where each functional entity completes the switching operation. When the switching operation only proceeds to a part of the entity, the switching operation of the entity that is performing the switching operation can be stopped, and the already performed switching operation is canceled.

The following takes the cancellation process of R6 interface and R4 interface switching as an example for detailed description.

For example, as shown in Figure 6, the switch canceling process of the R6 interface is as follows:

Step 10: The MSS/SS sends a handover cancellation indication to the service BS;

During the execution of the handover operation, the MSS/SS sends a handover cancellation indication to the service BS;

Step 11: After receiving the handover cancellation indication, the serving BS stops the related timer used by the handover procedure, and sends the handover cancellation indication to the ASN-GW to restore the resource state before the handover procedure, where the handover cancellation indication may be Carrying: cancellation reason, MSS/SS identification, MSS/SS information, target handover function entity information, specific handover operation requiring cancellation, etc.; if the data path between the serving BS and the associated ASN-GW has been released, execute Step 12;

Step 12: Establish a data path between the serving BS and the associated ASN-GW;

Step 13: After receiving the handover cancellation indication from the serving BS, the ASN-GW stops the related timer used by the handover procedure, sends the handover cancellation indication to the relevant target BS, and restores the resource state before the handover procedure, if the target BS is related. The data path between the ASN-GW has been established, and step 14 is performed;

After receiving the handover cancellation indication, the target BS stops the related timer used by the handover operation, and restores the resource state before the handover operation; if the air interface link between the target BS and the MSS/SS has been established, step 15 is performed; Step 14: Release the data path between the target BS and the ASN-GW;

Step 15: Release the relevant air interface link between the target BS and the MSS/SS, and the handover cancel operation is completed.

The process of canceling the handover of the R4 interface is as shown in FIG. 7, which specifically includes the following steps: Step 20: The MSS/SS sends a handover cancellation indication to the service BS;

Step 21: After receiving the handover cancellation indication, the serving BS stops the related timer used by the handover procedure, and sends the handover cancellation indication to the serving ASN-GW to restore the resource state before the handover procedure, where the handover cancellation indication may be The bearer includes: the cancellation reason, the MSS/SS information, the target handover function entity information, the specific handover operation that needs to be canceled, and the like; if the data path between the serving BS and the serving ASN-GW has been released, step 22 is performed; Step 22: Establishing a data path between the serving BS and the serving ASN-GW;

Step 23: After receiving the handover cancellation indication from the serving BS, the serving ASN-GW stops the related timer used by the handover procedure, sends the handover cancellation indication to the anchor ASN-GW, and restores the resource status before the handover procedure, if the service ASN - the data path between the GW and the anchor ASN-GW has been released, then step 24 is performed;

Step 24: Establish a data path between the service ASN-GW and the anchor ASN-GW;

Step 25: After receiving the handover cancellation indication from the serving ASN-GW, the anchor ASN-GW stops the related timer used by the handover procedure, and sends the handover cancellation indication to the target ASN-GW to restore the resource status before the handover procedure. The data path between the anchor ASN-GW and the target ASN-GW has been established, and step 26 is performed;

Step 26: Release the data path between the anchor ASN-GW and the target ASN-GW;

Step 27: After receiving the handover cancellation indication from the anchor ASN-GW, the target ASN-GW stops the related timer used by the handover procedure, sends the handover cancellation indication to the relevant target BS, and restores the resource state before the handover procedure, if the target The data path between the BS and the target ASN-GW has been established, and step 28 is performed; After receiving the handover cancellation indication, the target BS stops the related timer used by the handover operation, and restores the resource state before the handover operation; if the air interface link between the target BS and the MSS/SS has been established, step 29 is performed; Step 28: Release the data path between the target BS and the target ASN-GW;

Step 29: Release the relevant air interface link between the target BS and the MSS/SS, and the handover cancel operation is completed. The present invention provides a radio access network handover cancellation processing apparatus, where the apparatus includes the following functional modules: a handover cancellation indication module, configured to send a handover cancellation indication to a next functional entity that needs to cancel the handover operation according to actual needs;

The switching state determining module is configured to determine, after receiving the switching cancellation indication, whether the current entity has performed the switching operation, and use the determination result as a basis for performing the canceling switching operation by the switching cancellation execution module;

The switching cancellation execution module is configured to cancel the switching operation that has been performed according to the received switching cancellation instruction. This includes releasing an established airlink link or data path, or establishing a data path that has been released.

The function modules are disposed on each entity of the radio access network, and include: MSS/SS, BS, and ASN-GW. In summary, the present invention sends a handover cancellation indication to each functional entity that needs to cancel the handover operation, and the cancellation operation is performed by each entity, thereby realizing complete recovery of the related network resources after the handover cancellation operation.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A radio access network handover cancellation processing method, comprising:

The handover cancellation indication is sent to the entity that needs to cancel the handover operation, and the handover cancellation operation is performed by the entity, and the resource state before the handover operation is restored.

2. The wireless access network handover cancellation processing method according to claim 1, wherein the method specifically includes:

The method for canceling the handover of the radio access network according to claim 2, wherein the functional entity that needs to cancel the handover operation comprises:

and / or,

Transfer switching function entity: switch operation base point;

and / or,

Target switching function entity: switching operation target entity;

The wireless access network switching cancellation processing method according to claim 2 or 3, wherein the step B comprises:

The wireless access network switching cancellation processing method according to claim 3, wherein the step B comprises:

B3. Determine that a data path between the transfer switching function entity and the target switching function entity has been established, and release the data path.

The method for processing the radio access network handover cancellation according to claim 1, wherein the information carried in the handover cancellation indication comprises:

Cancellation reason, MSS/SS identification, MSS/SS information, target switching function entity information, and/or specific switching operation information that needs to be canceled.

A radio access network handover cancellation processing apparatus, characterized in that: in each entity of the radio access network,:

The switching cancellation execution module is configured to cancel the switching operation that has been performed according to the received switching cancellation instruction.

10. The device for canceling and canceling a wireless access network according to claim 9, wherein the device is further configured with: