WO2011147098A1

WO2011147098A1 - Processing method and equipment for acquiring context

Info

Publication number: WO2011147098A1
Application number: PCT/CN2010/073352
Authority: WO
Inventors: 陆峰; 吴问付
Original assignee: 华为技术有限公司
Priority date: 2010-05-28
Filing date: 2010-05-28
Publication date: 2011-12-01
Also published as: CN102369761A; CN102369761B

Abstract

A processing method for acquiring context in communication technology field is provided. A mobility management element (MME) acquires information about spare wireless access network elements. The MME sends messages to said spare wireless access network elements, and said messages include said context of user equipment. An embodiment in the present invention also provides an MME and a wireless access network element. The embodiment enables an MME to send context of user equipment to one or more spare wireless access network elements, to ensure that the spare wireless access network elements acquire said context of user equipment in the case of X2 interfaces being invalid or being not used, thus ensuring session service of user equipment is not interrupted after handover is finished.

Description

The present invention relates to the field of communications technologies, and in particular, to a method and a device for processing a context. Background of the invention

Currently, in the network environment of the 3rd Generation Partnership Project (3GPP), for user equipments in the ongoing service (in the connected state), if high-speed movement is performed between a plurality of cells, for example, high speed In the railway environment, due to the Doppler frequency offset effect, etc., it is very easy to cause a failure to switch to the target cell, or the handover is successful but the current user equipment is at the cell edge and its wireless link is unavailable. The device session service is interrupted, which affects the user's service experience.

The prior art proposes a multi-target handover method. When a source-side radio access network element performs a handover decision on a user equipment, the source-side radio access network element directly connects to multiple target radio access network elements (a radio connection corresponding to multiple target cells). The inbound network element sends a handover request, and each target radio access network element saves the context of its UE after receiving the handover request message, and allocates corresponding resources to the user equipment, and the source side radio access network After receiving the handover request response message of all the target radio access network NEs, the UE needs to determine to send a response message to the user equipment. Because the plurality of target radio access network elements learn the context of the UE by using the foregoing process, so that the UE can switch to one of the multiple target radio access network elements, the UE can The network element of the target radio access network is re-accessed, so that the UE can maintain the continuity of the service in the connected state.

The inventors found in the process of implementing the present invention that the prior art has at least the following disadvantages:

Since the prior art requires that the source side radio access network element and all the target radio access network elements have an X2 interface, the context of the UE can be sent to all target radio access network elements; further, due to all When the target radio access network element learns the context, it needs to allocate corresponding resources to prepare for the handover of the user equipment, resulting in waste of resources.

In summary, the processing method of the prior art acquisition context cannot work for the X2 interface or does not use the X2 interface, so that all the target radio access network elements cannot know the context of the UE, and thus The user equipment session service may be interrupted, which may affect the service experience of the user. The processing of all the target radio access network elements in the foregoing solution after learning the context of the UE may result in waste of resources and complicated defects in processing. Summary of the invention

An embodiment of the present invention provides a method and a device for processing a context, so that an alternative radio access network element can learn the context of the UE when the X2 interface is unavailable or does not use the X2 interface, and ensure the session service of the user equipment after the handover is completed. Not interrupted.

The embodiments of the present invention are implemented by the following technical solutions:

An embodiment of the present invention provides a method for processing a context, including:

The source-side mobility management network element receives the handover requirement message sent by the network element of the source-side radio access network, where the handover requirement message carries the information of the candidate radio access network network element; or the source-side mobility management network element configures according to the self-configuration Obtaining the information of the candidate radio access network network element; or the source-side mobility management network element receives the message sent by the target-side mobility management network element, where the target-side mobility management network element sends The sent message carries the information of the network element of the alternative radio access network;

The source-side mobility management network element sends a message to the candidate radio access network element included in the network element information of the candidate radio access network, and the message sent by the source-side mobility management network element includes the user equipment. Context.

The target-side mobility management network element receives the message sent by the source-side mobility management network element, and the message sent by the source-side mobility management network element carries the information of the candidate radio access network network element; or, the target-side mobility management network element is configured according to The configuration of the alternative radio access network element information is obtained by the self-configuration; or the target-side mobility management network element receives the handover request response message sent by the network element of the target-side radio access network, where the handover request response carries the alternative radio access network Network element information;

The target-side mobility management network element sends a message to the candidate radio access network element included in the candidate radio access network element information, where the message sent by the target-side mobility management network element includes the user equipment. Context.

The candidate mobility management network element receives the message sent by the source side mobility management network element or the target side mobility management network element, and the message sent by the source side mobility management network element or the target side mobility management network element carries the candidate radio access network. Network element information and a context of the user equipment;

And the candidate mobility management network element sends a message to the candidate radio access network network element included in the candidate radio access network network element information, where the message includes a context of the user equipment.

The embodiment of the invention provides a mobility management network element, including:

The acquiring unit, configured to obtain the information of the network element of the candidate radio access network, includes: receiving a handover request message sent by the network element of the source side radio access network, where the handover request message carries the information of the radio element of the alternative radio access network; or The information of the candidate radio access network element is obtained according to the configuration of the radio access network; or the message sent by the target side mobility management network element is sent by the target side mobility management network element, and the message of the alternative radio access network element is carried by the target side mobility management network element. Information

And a message sending unit, configured to send a message to the candidate radio access network element included in the network element information of the candidate radio access network, where the message sent by the source-side mobility management network element includes a context of the user equipment.

The acquiring unit, configured to obtain the information of the network element of the candidate radio access network, includes: receiving a message sent by the source-side mobility management network element, where the message sent by the source-side mobility management network element carries the information of the network element of the candidate radio access network Or, the information about the candidate radio access network network element is obtained according to the configuration; or, the handover request response message sent by the network element of the target side radio access network is received, and the handover request response carries the information of the candidate radio access network element ;

And a message sending unit, configured to send a message to the candidate radio access network element included in the network element information of the candidate radio access network, where the message sent by the target mobility management network element includes a context of the user equipment.

The acquiring unit, configured to obtain the information of the network element of the candidate radio access network, includes: receiving a message sent by the source-side mobility management network element or the target-side mobility management network element, where the source-side mobility management network element or the target-side mobility management network The message sent by the element carries the information of the network element of the alternative radio access network and the context of the user equipment;

a message sending unit, configured to send a message to the candidate radio access network element included in the candidate radio access network network element information, where The message contains the context of the user equipment.

An embodiment of the present invention provides a radio access network network element, including: a first receiving unit, configured to receive a message, where the message carries a context of a user equipment;

An identifying unit, configured to identify whether the message is used to forward a context of the user equipment;

a second receiving unit, configured to receive a radio resource control message sent by the user equipment;

And a resource allocation unit, configured to allocate an air interface resource to the user equipment after the identifying unit identifies the message for forwarding the context of the user equipment and the second receiving unit receives the radio resource control message of the user equipment.

As can be seen from the technical solution provided by the foregoing embodiments of the present invention, the mobility management network element sends the context of the user equipment to one or more candidate radio access network NEs, so that the X2 interface is unavailable. When the X2 interface is not used, the network element of the user equipment is obtained by the candidate radio access network element, so that the session service of the user equipment is not interrupted after the handover is completed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flowchart of a method for processing a context according to an embodiment of the present invention;

2 is a flowchart of a method for processing a context according to Embodiment 2 of the present invention;

3 is a flowchart of a method for processing a context according to Embodiment 3 of the present invention;

4 is a flowchart of Embodiment 4 of the present invention;

Figure 5 is a flowchart of Embodiment 5 of the present invention;

6 is a flowchart of Embodiment 6 of the present invention;

7 is a flowchart of Embodiment 7 of the present invention;

8 is a schematic structural diagram of a mobility management network element according to Embodiment 8 of the present invention;

FIG. 9 is a schematic structural diagram of a network element of a radio access network according to Embodiment 9 of the present invention.

Mode for carrying out the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

Embodiment 1 FIG. 1 is a flowchart of a method for processing a context according to a first embodiment, where the method includes the following operations: Step 101: A source-side mobility management network element receives a handover request message sent by a network element of a source-side radio access network, The handover request message carries the information of the candidate radio access network network element; or the source-side mobility management network element learns the information of the candidate radio access network element according to its configuration; or the source-side mobility management network element receives the target a message sent by the side mobility management network element, where the message sent by the target mobility management network element carries the information of the candidate radio access network network element;

The source-side mobility management network element receives the message that is sent by the target-side mobility management network element, and the message that is sent by the target-side mobility management network element to carry the information of the candidate radio access network element includes:

The source-side mobility management network element receives a forwarding relocation response message sent by the target-side mobility management network element, where the forwarding relocation response message carries the information of the candidate radio access network network element; or The source-side mobility management network element receives the forwarding relocation requirement message sent by the target-side mobility management network element, where the forwarding relocation requirement message carries the candidate radio access network element information.

The method for the source side radio access network element to learn the information of the alternative radio access network element will be described in detail in the following embodiments. Step 102: The source-side mobility management network element sends a message to the candidate radio access network element included in the network element information of the candidate radio access network, and the message sent by the source-side mobility management network element Contains the context of the user device.

The sending, by the source-side mobility management network element, the message to the candidate radio access network element may be a handover preparation message or a handover request message. The method for acquiring the context of the user equipment from the handover preparation message or the handover request message by the candidate radio access network element includes: the handover preparation message or the handover request message carrying the forwarding user equipment context indication; The network element of the candidate radio access network, according to the forwarding user equipment context indication carried in the handover preparation message or the handover request message, learns that the handover preparation message or the handover request message is used to forward the context of the user equipment. And the candidate radio access network element acquires the context of the user equipment. Or,

The handover preparation message or the handover request message carries a target identifier, and the candidate radio access network element determines the candidate radio access network according to the handover identifier message or the target identifier information carried in the handover request message. The element is not the target side radio access network element, and the candidate radio access network element acquires the context of the user equipment.

After the candidate radio access network element acquires the context of the user equipment, the air interface resource is not allocated, and the radio resource control message (for example, the RRC connection) sent by the user equipment is received by the candidate radio access network element. After the reconfiguration request message or the RRC connection reconfiguration complete message), the candidate radio access network network element allocates air interface resources to the user equipment.

In this embodiment, the mobility management network element sends the context of the user equipment to one or more candidate radio access network NEs, so that the alternative radio access is guaranteed when the X2 interface is unavailable or the X2 interface is not used. The network element learns the context of the user equipment, so as to ensure that the session service of the user equipment is not interrupted after the handover is completed.

In addition, the candidate radio access network element does not allocate an air interface resource after learning the context of the user equipment, and if the user equipment fails to switch or the handover completes to find that the radio link is unavailable, if the user equipment is camped When the one of the candidate radio access network elements is used, the user equipment can be successfully re-established to the candidate radio access network element to ensure that the session service is not interrupted and the air interface resource is saved. Embodiment 2: FIG. 2 is a flowchart of a processing method for acquiring a context according to Embodiment 2, where the method includes the following operations: Step 201: A target-side mobility management network element receives a message sent by a source-side mobility management network element, where the source The message sent by the side mobility management network element carries the information of the candidate radio access network network element; or the target side mobility management network element learns the information of the candidate radio access network element according to its configuration; or, the target side mobility management network Receiving, by the UE, a handover request response message sent by the network element of the target side radio access network, where the handover request response carries the information of the network element of the candidate radio access network;

The target-side mobility management network element receives the message sent by the source-side mobility management network element, and the message sent by the target-side mobility management network element carrying the information of the candidate radio access network network element specifically includes:

The target-side mobility management network element receives the forwarding relocation request message sent by the source-side mobility management network element, where the forwarding relocation request message carries the information of the candidate radio access network network element; or The target-side mobility management network element receives the forwarding relocation requirement message sent by the source-side mobility management network element, where the forwarding relocation requirement message carries the candidate radio access network element information.

The method for obtaining the information of the candidate radio access network network element for the target side radio access network element will be described in detail in the following embodiments.

Step 202: The target-side mobility management network element sends a message to the candidate radio access network element included in the network element information of the candidate radio access network, and the message sent by the target-side mobility management network element Contains the context of the user device.

The target side mobility management network element sends a message to the candidate radio access network element as a handover preparation message or a handover request message. The method for the network element of the candidate radio access network to obtain the context of the user equipment from the handover preparation message or the handover request message includes:

The handover preparation message or the handover request message carries a forwarding user equipment context indication; the candidate radio access network network element learns the manner according to the forwarding user equipment context indication carried in the handover preparation message or the handover request message. The handover preparation message or the handover request message is used to forward the context of the user equipment, and the candidate radio access network network element acquires the context of the user equipment. Or

The handover preparation message or the handover request message carries a target identifier, and the candidate radio access network network element determines the candidate radio access network element according to the handover preparation message or the target identification information carried in the handover request message. It is not the target side radio access network element, and the candidate radio access network element acquires the context of the user equipment.

In addition, the candidate radio access network element does not allocate an air interface resource after learning the context of the user equipment, and if the user equipment fails to switch or the handover completes to find that the radio link is unavailable, if the user equipment is camped When the one of the candidate radio access network elements is used, the user equipment can be successfully re-established to the candidate radio access network element to ensure that the session service is not interrupted and the air interface resource is saved. Embodiment 3: FIG. 3 is a flowchart of a processing method for acquiring a context according to Embodiment 3, where the method includes the following operations: Step 301: The alternative mobility management network element receives a source-side mobility management network element or a target-side mobility management network element. The message sent by the source-side mobility management network element or the target-side mobility management network element carries the information of the candidate radio access network network element and the context of the user equipment;

The candidate mobility management network element receives a message sent by the source side mobility management network element or the target side mobility management network element, and the message sent by the source side mobility management network element or the target side mobility management network element carries an alternative wireless connection. The network element information of the network includes:

The alternate mobility management network element receives a forwarding relocation request message sent by the source side mobility management network element or the target side mobility management network element, where the forwarding relocation request message carries the information of the candidate radio access network element and the The context of the user equipment; or, The candidate mobility management network element receives a forwarding relocation requirement message sent by the source side mobility management network element or the target side mobility management network element, where the forwarding relocation requirement message carries the information of the candidate radio access network element and the The context of the user device.

Step 302: The candidate mobility management network element sends a message to the candidate radio access network element included in the candidate radio access network element information, where the message includes a context of the user equipment.

The alternate mobility management network element sends a message to the alternate radio access network element as a handover preparation message or a handover request message. The method for obtaining the context of the user equipment from the handover preparation message or the handover request message by the candidate radio access network element includes:

In addition, the candidate radio access network element does not allocate an air interface resource after learning the context of the user equipment, and if the user equipment fails to switch or the handover completes to find that the radio link is unavailable, if the user equipment is camped When the one of the candidate radio access network elements is used, the user equipment can be successfully re-established to the candidate radio access network element to ensure that the session service is not interrupted and the air interface resource is saved. In order to further understand the present invention, the switching processing method according to the embodiment of the present invention will be described in detail below with reference to specific embodiments. Embodiment 4: As shown in FIG. 4, this embodiment provides a method for processing a context, which specifically includes:

31 switching process:

Step 400: The source side radio access network element decision initiates a handover process.

The source side radio access network element receives the measurement report reported by the user equipment, initiates a handover process, determines a target cell for the handover, and obtains information of the candidate radio access network element. The source side radio access network element may obtain the information of the candidate radio access network element from the measurement report reported by the user equipment, or the source side radio access network element may itself The candidate radio access network network element information is obtained by configuration information (for example, may be obtained through network topology information configuration or calculation, etc.).

In the embodiment of the present invention, the network element of the alternative radio access network is defined as a user equipment in the handover process, in order to avoid that the user equipment fails to switch or the radio link is found to be unavailable after the handover is completed, and the selected storage is performed. Wireless connection of user equipment context information Incoming network element (which does not include the target radio access network element). The identifier of the one or more candidate radio access network elements may be included in the network element information of the candidate radio access network, which is not limited in this embodiment.

The mobility management network element corresponding to the home/service of the candidate radio access network element may be a source-side mobility management network element or a target-side mobility management network element or an alternate mobility management network element. The alternative mobility management network element refers to other mobility management network elements except the source side mobility management network element and the target side mobility management network element.

The method for the source-side radio access network element to obtain the information of the network element of the candidate radio access network may include, but is not limited to, the following methods:

1) The source side radio access network element learns the candidate radio access network element information from the extended measurement report reported by the user equipment. For example, the user equipment may report the candidate location information suggested by the user equipment when reporting the measurement report, where the candidate location information may be candidate cell information or candidate radio access network element information, the candidate location information. The method may be that the user equipment is calculated according to the motion trajectory of the user equipment (the method for determining the specific radio access network element of the user equipment is not limited in this embodiment), and the specific implementation of the extended measurement report may be as follows: Selecting a target location information (Backup Target Location Information) cell, so that the source side radio access network element obtains the candidate target location information, and if the candidate location information is candidate cell information, the source side radio access network The element obtains the information of the candidate radio access network network element according to the candidate cell information, and if the candidate location information is the candidate candidate radio access network element information, the source side radio access network element directly obtains the candidate radio Access network element information. Or,

2) The source side radio access network element learns the candidate radio access network element information according to other cell information except the target cell that is included in the measurement report reported by the user equipment. The measurement report is not extended at this time, and the source side radio access network element obtains the corresponding radio access network element information according to other cell information except the target cell included in the measurement report, and the radio access network element information is obtained. As an alternative radio access network network element information. Or,

3) the source side radio access network element according to the source side radio access network element information, the target side radio access network element information, the source side mobility management network element information, and the target side mobility management network element information One learns the information of the candidate radio access network network element. The measurement report reported by the user equipment is not extended at this time, and the source side radio access network element is based on the source side radio access network element information, the determined target side radio access network element information, and the source side mobility management network element. At least one of the information and the target-side mobility management network element information obtains the information of the candidate radio access network network element through the self-configuration information or the network topology information, for example, the source-side radio access network element itself configures the neighbor radio access The network element information, the source side radio access network element obtains the corresponding neighbor radio access network element information according to the source side radio access network element information and/or the determined target side radio access network element information matching configuration information. Optional radio access network network element information, or the source side radio access network element itself is counted according to the motion trajectory of the user equipment (for example, according to the source side radio access network element information and/or the determined target side wireless Access network element information) The obtained radio access network element information.

The candidate radio access network element in this embodiment may include, but is not limited to, all or part of neighbor radio access network elements of the source side radio access network element, and the target side radio access network. All or part of the neighbor radio access network element, and all or part of the radio access network element within the source-side mobility management network element service, and all or part of the wireless connection within the target-side mobility management network element service range The network access network element, and other at least one of other radio access network elements (ie, within the range of the alternative mobility management network element service) that are not in the range of the source side and the target side mobility management network element service.

Step 401: The source side radio access network element sends a handover requirement to the source side mobility management network element. Interest

The switching requirement message includes the candidate radio access network element information.

If the target cell of the handover does not belong to the source-side mobility management network element service scope, that is, the MME changes, step 402 is performed; if the MME does not change and the learned candidate radio access network element is not on the source side, If the MME does not change and the candidate radio access network element is in the range of the mobility management network element service (that is, it exists in the range of the alternative mobility management network element service), step 403 is performed. In the range of the source-side mobility management network element service, step 405 is performed (steps 402 to 404 are not performed).

Step 402: The source-side mobility management network element sends a Forwarding Relocation Request message to the target-side mobility management network element.

Specific solution 4A: The source-side mobility management network element sends a forwarding relocation request message to the target-side mobility management network element, and the source-side mobility management network element sends a message to the candidate mobility management network element, where the source-side mobility management The message sent by the network element to the candidate mobility management network element carries the information of the candidate radio access network network element and the user equipment context information.

The forwarding relocation request message sent by the source-side mobility management network element to the target-side mobility management network element may carry the information of the candidate radio access network network element, where the information of the candidate radio access network element may be Yes: all candidate radio access network element information learned by the source-side mobility management network element in step 401; or, instead of the alternative radio access network element information in the source-side mobility management network element service range (ie, Optional radio access network element information that exists within the range of the alternate mobility management network element service and the target side mobility management network element service); or, alternatively, an alternative wireless connection within the scope of the target side mobility management network element service Network element information.

For the scheme 4A, if the source-side mobility management network element learns that the existing radio access network element is not in the source-side mobility management network element service scope and the target-side management network element service scope (that is, exists in the candidate) The mobile management network element needs to perform step 403, and the source-side mobility management network element sends a message carrying the candidate radio access network element information to the candidate mobility management network element. Wherein, for the scheme 4A, the execution order of the step 402 and the step 403 is not limited.

Specific solution 4B: The source-side mobility management network element sends a forwarding relocation request message to the target-side mobility management network element, and the target-side mobility management network element sends a message to the candidate mobility management network element, where the target-side mobility management is performed. The message sent by the network element to the alternate mobility management network element carries the information of the candidate radio access network element:

The forwarding relocation request message sent by the source-side mobility management network element to the target-side mobility management network element carries the information of the candidate radio access network network element, where the candidate radio access network element information may be : all candidate radio access network network element information obtained by the source-side mobility management network element in step 401; or, instead of the source information of the source-side mobility management network element, the candidate radio access network element information (ie, presence) Alternate radio access network element information within the range of the alternative mobility management network element service and the target side mobility management network element service).

For the scheme 4B, if the target side mobility management network element learns that the existing radio access network element is not in the source side mobility management network element service scope and the target side management network element service scope (ie, exists in the candidate) The mobile management network element service needs to perform step 404, and the target side mobility management network element sends a message carrying the candidate radio access network element information to the candidate mobility management network element.

Step 403: The source side mobility management network element sends a message to the candidate mobility management network element.

The message sent by the source-side mobility management network element to the candidate mobility management network element may be a forwarding relocation request. (Forwarding Relocation Request) message, or may be a new message, such as a Forward Relocation Required message (there is no restriction on the name of the message in this implementation), which specific message is used in this embodiment. Make restrictions.

The message sent by the source-side mobility management network element to the candidate mobility management network element includes the candidate radio access network element information and the user equipment context information. The candidate radio access network element information included in the message sent by the source-side mobility management network element to the candidate mobility management network element may be: all the options learned by the source-side mobility management network element in step 401. Or the access network element information of the radio access network; or, the information of the radio access network element of the alternative radio access network within the service scope of the source-side mobility management network element (ie, exists in the service area of the alternative mobile management network element and the mobile management element of the target side) Alternative radio access network element information within the service area; or alternatively, radio access network element information within the scope of the alternative mobility management network element service.

The message sent by the source-side mobility management network element to the candidate mobility management network element specifically includes but is not limited to the following methods:

1) The message sent by the source-side mobility management network element to the candidate mobility management network element further includes a forwarding indication, such as a Forward UE Context Indicator, indicating that the message is used to forward the context of the user equipment. Forwarding the relocation request or forwarding the relocation request message, so that the candidate mobility management network element that receives the forwarding relocation request or the forwarding relocation requirement message learns the context of the user equipment and the information of the candidate radio access network network element, However, the handover/relocation related operations of the target side mobility management network element are not performed (for example, creating a session connection with the serving gateway); or,

2) The message sent by the source-side mobility management network element to the candidate mobility management network element further includes target identification information, such as a target identifier (Target ID), and the alternative mobility management network element may resolve the Target ID cell. Radio access network network element identifier included in

(For example, the eNodeB ID), if the target radio access network element does not belong to the current alternative mobility management network element, it is learned that the current mobility management network element is an alternative mobility management network element instead of the target side mobility management. The network element enables the candidate mobility management network element that receives the forwarding relocation request or forwards the relocation requirement message to learn the context of the user equipment and the candidate radio access network element information, but does not perform the target side mobility management. Switching/relocation related operations of network elements (such as creating session connections with the service gateway).

The candidate mobility management network element may set a timer Backup_UE_Context_Timer corresponding to the context information, that is, start the timer when the context information of the user equipment is obtained, if the UE is in the candidate If the mobility management network element is successfully re-established, the timer is cleared. If the timer expires, the saved context information of the user equipment may be cleared to avoid waste of storage resources on the alternative mobility management network element. The timeout period of the timer may be configured by the alternate mobility management network element itself or may be obtained from the message sent by the source side mobility management network element to the alternate mobility management network element.

Step 404: The target side mobility management network element sends a message to the alternative mobility management network element.

For the description of the message sent by the target-side mobility management network element to the candidate mobility management network element, refer to the message sent by the source-side mobility management network element to the candidate mobility management network element in step 403. Description, no longer repeat here.

For the process of setting a timer in the candidate mobility management network element, refer to the description of the timer in step 403, and details are not described herein.

Steps 403 and 404 are parallel steps, and only one of the steps can be performed in this embodiment.

Step 405: The target side mobility management network element sends a handover request (Handover Request) to the target side radio access network element. Message.

The target-side mobility management network element is actually a source-side mobility management network element, and the foregoing step 402 and step 404 are not performed.

Receiving the handover request message sent by the target side mobility management network element, the target side radio access network element learns the UE context information, and allocates a corresponding resource to create a radio access bearer (for example, creating an S1) Bearer), etc., prepare for the switch.

Step 406: The target side radio access network element sends a handover request acknowledgement (Handover Request Acknowledge) message to the target side mobility management network element.

Step 407: The mobility management network element sends a message to the candidate radio access network network element.

The sending, by the mobility management network element, the message to the network element of the candidate radio access network may include: obtaining the source-side mobility management network element or the target mobility management network element or the candidate mobility management network element. The alternate radio access network element within its range of services transmits the message.

The message sent by the mobility management network element to the network element of the candidate radio access network includes the context information of the user equipment, where the candidate radio access network element is sent according to the mobility management network element. The message acquires and saves the context information of the user device.

Wherein, in the case that there are multiple alternative radio access network elements, each candidate radio access network element receives the message sent by its serving/home mobility management network element. The candidate radio access network element may include a radio access network element belonging to the source side mobility management network element service range, and/or a wireless attribute belonging to the target side mobility management network element service range. The access network element, and/or the radio access network element belonging to the service range of the alternative mobility management network element.

The message sent by the mobility management network element (source-side mobility management network element or target mobility management network element or candidate mobility management network element) to the candidate radio access network element may be a handover request ( The Handover Request message may be a new S1-AP message, such as a Handover Preparation message (the present embodiment does not limit the name of the message), and which one of the above messages is used in this embodiment. No restrictions.

The message sent by the mobility management network element to the candidate radio access network element specifically includes but is not limited to the following methods:

1) The message sent by the mobility management network element to the candidate radio access network element further includes a forwarding indication, such as a Forward UE Context Indicator, indicating that the handover request message is a forwarding user equipment. The context switching request or the handover preparation message, so that the candidate radio network element receiving the handover request message learns the context information of the user equipment and does not perform related processing for performing handover (for example, not assigning the corresponding air interface to the user equipment) Resources); or,

2) The message sent by the mobility management network element to the candidate radio access network element further includes target identification information, such as a target cell identifier, if the Target Cell ID does not belong to the current radio access The network element, the current radio access network element is the candidate radio access network element instead of the target side radio access network element, so that the candidate radio network element receiving the handover request message learns the user Context information of the device and not related processing for performing handover (for example, the user equipment is not allocated corresponding air interface resources).

The optional radio access network network element may set a timer corresponding to the context information. Temp_UE_Context_ Timer, that is, the timer is started when the context information of the user equipment is obtained, and if the UE successfully reestablishes the network element of the candidate radio access network, the timer is cleared, if the timer After the timeout expires, the saved context information of the user equipment may be cleared to avoid waste of storage resources on the network element of the alternative radio access network. The timeout period of the timer may be configured by the alternate radio access network element itself or may be obtained from a message sent by its corresponding mobility management network element.

The execution order of step 407 and step 405 is not limited in this embodiment.

Step 408: The alternate radio access network network element sends a response message to the mobility management network element.

The response message sent by the candidate radio access network element to the mobility management network element may be a Handover Request Acknowledge message, or may be a new handover preparation response (Handover Preparation). Ack) Message. Specifically, the method may include, but is not limited to, the following:

The message sent by the candidate radio access network element to the mobility management network element further includes a forwarding response indication, such as a Forward UE Context Ack Indicator, indicating that the response message is the The response message of the step 407 is not the handover request response message sent by the target radio access network element where the target cell is located, so that the mobility management network element that receives the handover request response message confirms the candidate radio network element acquisition. The context of the user equipment, but does not perform the handover/relocation related operation of the mobility management network element (for example, triggering the Create Indirect Data Forwarding Tunnel or sending a handover command to the source side radio access network element (Handover) Command) message).

The step 408 is optional, and may or may not be performed. This embodiment does not limit this.

Step 409: The alternative mobility management network element sends a response message to the source side mobility management network element.

The response message sent by the candidate mobility management network element to the source-side mobility management network element may be a new message, such as a Forward Relocation Ack (Forward Relocation Ack) message, or may be a forwarding relocation. Response (Reward Response) message. Specifically, the method may include, but is not limited to, the following:

The response message sent by the candidate mobility management network element to the source-side mobility management network element further includes a forwarding response indication, such as a Forward UE Context Ack Indicator, indicating that the response message is The response message of step 403 is configured, so that the source-side mobility management network element that receives the response message confirms that the candidate mobility management network element learns the candidate radio access network element information or confirms that the radio access network element succeeds. Sending the context information of the user equipment to the network element of the radio access network, where the source side mobility management network element does not perform the handover/relocation related operation of the target side mobility management network element (for example, creating a session connection with the serving gateway) .

The step 409 is optional, and may or may not be performed. This embodiment does not limit this.

The step 409 may be performed after the step 403, or may be performed after the step 408 (ie, the candidate radio access network element sends a response message to the alternate mobility management network element), which is not limited in this embodiment. .

Step 410: The alternative mobility management network element sends a response message to the target side mobility management network element.

For the description of the response message sent by the candidate mobility management network element to the target side mobility management network element, refer to the response sent by the candidate mobility management network element to the source side mobility management network element in step 409. The description of the message is not described here.

The step 410 is optional, and may or may not be performed. This embodiment does not limit this.

The step 410 may be performed after the step 404, or may be performed after the step 408 (ie, the candidate radio access network element sends a response message to the alternate mobility management network element), which is not limited in this embodiment. . Step 411: The target-side mobility management network element sends a Forward Relocation Response (Forward Relocation Response) message to the source-side mobility management network element.

If the mobility management network element has not changed, step 402 and step 410 are not performed.

Step 412: The source side mobility management network element sends a handover command (Hnadover Command) message to the source side radio access network element.

Step 413: Perform the remaining process of the S1 handover, including updating the uplink and downlink user plane transmission path, the tracking area update process, and the like, and details are not described herein again.

In addition, if the user equipment fails to perform the handover procedure or performs the handover completion to discover that the radio link is unavailable, the user equipment may perform a re-establishment process in the candidate radio access network network element:

Step 414: The user equipment sends an RRC Connection Reestablishment Request (RRC Connection Reestablishment Request) message to the radio access network element that the user equipment attempts to reestablish.

If the user equipment learns that the handover fails or the handover completes and the radio link is unavailable, the user equipment listens to the broadcast channel, selects the cell information learned by the broadcast information, and the user equipment sends an RRC connection reestablishment request message to the user equipment. Performing a cell selection attempt to reconstruct a radio access network element (ie, one of the above alternative radio access network elements).

Step 415: The candidate radio access network element sends an RRC connection reestablishment to the user equipment (RRC Connection)

Reestablishment) message.

If the radio access network element that the user equipment attempts to reestablish is one of the foregoing radio access network elements, the network element of the candidate radio access network acquires the context of the user equipment by using step 407. The alternate radio access network element may send an RRC connection reestablishment message to the user equipment. The radio access network element may allocate corresponding resources to the UE to restore the radio access bearer.

Step 416: The user equipment sends an RRC Connection Reestablishment Complete (RRC Connection Reestablishment Complete) message to the candidate radio access network network element.

The user equipment receives the RRC connection reestablishment message and restores SRB 1 (signaling radio bearer 1).

Step 417: The candidate radio access network network element sends an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message to the user equipment.

Step 418: The user equipment sends an RRC Connection Reconfiguration Complete (RRC Connection Reconfiguration Complete) message to the candidate radio access network network element.

The user equipment receives the RRC connection reconfiguration, recovers the SRB2 (signaling radio bearer 2) and the DRB (data radio bearer 2)

Step 419: Perform the remaining process of the re-establishment process, including updating the uplink and downlink user plane transmission paths, and details are not described herein again. In the embodiment of the present invention, the source side radio access network element obtains the information of the candidate radio access network element in the user equipment handover procedure, and causes the mobility management network element to obtain the information of the candidate radio access network element. And transmitting the context information of the user equipment to the candidate radio access network element by using the mobility management network element, so that the candidate radio access network is guaranteed when the X2 interface is unavailable or not using the X2 interface. The network element learns the context of the user equipment, so that the user equipment may perform reconstruction on the candidate radio access network element in the learned context when the handover fails or the handover completes to discover that the radio link is unavailable. Process, Keep the session uninterrupted, reduce the call drop rate, and improve the user experience. Embodiment 5: As shown in FIG. 5, this embodiment provides another method for obtaining a context, which specifically includes:

S1 switching process:

Step 500: The source side radio access network element decision initiates a handover process.

The source side radio access network element receives the measurement report reported by the user equipment, initiates a handover process, and decides to switch the target cell.

Step 501: The source side radio access network element sends a handover requirement message to the source side mobility management network element.

If the target cell of the handover does not belong to the source-side mobility management network element service scope (that is, the MME changes), step 502 is performed; if the MME does not change, step 503 is performed (step 502 is not performed).

Step 502: The source-side mobility management network element sends a Forwarding Relocation Request message to the target-side mobility management network element.

Step 503: The target side mobility management network element sends a handover request (Handover Request) message to the target side radio access network element.

The target-side mobility management network element is actually a source-side mobility management network element, and the foregoing step 502 is not performed.

After receiving the handover request message, the target side radio access network element may obtain the information of the candidate radio access network element by using the configuration information, which may include but is not limited to: the target side radio access network. The network element may pass at least one of the source side radio access network element information, the target side radio access network element information, the source side mobility management network element information, and the target side mobility management network element information through its own configuration information or The network topology information is used to obtain the information of the network element of the candidate radio access network. For example, the target radio access network element configures the neighbor radio access network element information, and the target side radio access network element is based on the source side radio access network. The meta information and/or the determined target side radio access network element information matching configuration information acquires the corresponding neighbor radio access network element information as the candidate radio access network element information, or the target side radio access network element The self is counted according to the motion trajectory of the user equipment (for example, according to the source side radio access network element information and/or the determined target side radio access network Information) derived from an alternative wireless access network information Wu.

The candidate radio access network element in this embodiment may include, but is not limited to, all or part of neighbor radio access network elements of the source side radio access network element, and the target side radio access network. All or part of the neighbor radio access network element, and all or part of the radio access network element within the source-side mobility management network element service, and all or part of the wireless connection within the target-side mobility management network element service range The network access network element, and other at least one of other radio access network elements (ie, within the range of the alternative mobility management network element) that are not within the scope of the source side and the target side mobility management network element service.

Step 504: The target side radio access network element sends a handover request response (Handover to the target side mobility management network element). Request Acknowledge ) Message.

The handover request response message sent by the network element of the target side radio access network includes the information of the candidate radio access network element (ie, obtained by step 503).

Step 505: The target side mobility management network element sends a message to the alternative mobility management network element.

The message sent by the target-side mobility management network element to the candidate mobility management network element may be a forwarding relocation request.

(Forwarding Relocation Request) message, or may be a new message, such as a Forward Relocation Required message (there is no restriction on the name of the message in this implementation), which specific message is used in this embodiment. Make restrictions.

The message sent by the target-side mobility management network element to the candidate mobility management network element includes the candidate radio access network element information and the user equipment context information. The candidate radio access network element information included in the message sent by the target side mobility management network element to the candidate mobility management network element may be: all the options learned by the source side mobility management network element in step 504. Radio access network network element information; or alternative radio access network network element information within the scope of the alternative mobility management network element service.

The message sent by the target-side mobility management network element to the candidate mobility management network element specifically includes but is not limited to the following methods:

1) The message sent by the target-side mobility management network element to the candidate mobility management network element further includes a forwarding indication, such as a Forward UE Context Indicator, indicating that the message is used to forward the context of the user equipment. Forwarding the relocation request or forwarding the relocation request message, so that the candidate mobility management network element that receives the forwarding relocation request or the forwarding relocation requirement message learns the context of the user equipment and the information of the candidate radio access network network element, However, the handover/relocation related operations of the target side mobility management network element are not performed (for example, creating a session connection with the serving gateway); or,

2) The message sent by the target-side mobility management network element to the candidate mobility management network element further includes target identification information, such as a target identifier (Target ID), and the alternative mobility management network element may resolve the Target ID cell. The radio access network element identifier (for example, the eNodeB ID) included in the radio access network is discriminated. If the target radio access network element does not belong to the current alternative mobility management network element, the current mobility management network element is determined as the alternative mobility. Administering the network element instead of the target-side mobility management network element, so that the candidate mobility management network element receiving the forwarding relocation request or forwarding the relocation requirement message learns the context of the user equipment and the candidate radio access network element Information, but does not perform handover/relocation related operations of the target-side mobility management network element (such as creating a session connection with the serving gateway).

The candidate mobility management network element may set a timer Backup_UE_Context_Timer corresponding to the context information, that is, start the timer when the context information of the user equipment is obtained, if the UE is in the candidate If the mobility management network element is successfully re-established, the timer is cleared. If the timer expires, the saved context information of the user equipment may be cleared to avoid waste of storage resources on the alternative mobility management network element. The timeout period of the timer may be configured by the alternate mobility management network element itself or may be obtained from a message sent by the target side mobility management network element to the alternate mobility management network element.

In addition, if the target side mobility management network element learns that the existing radio access network element is not in the service range of the alternative mobility management network element and the target side management network element service (that is, exists in the source side mobility management network element) Within the scope of the service, the target-side mobility management network element needs to send a message carrying the information of the candidate radio access network network element to the source-side mobility management network element. The embodiment does not limit the target side mobility management network element to send the message to the source side mobility management network element and the target side mobility management network element to the alternative mobility management. The order in which the network element sends the message (ie, does not limit the order of execution of step 505, step 506, and step 507).

Specific plan 5A:

Step 506 and step 507 are performed. In step 506, the target-side mobility management network element sends a message carrying the information of the network element of the candidate radio access network to the source-side mobility management network element. The execution sequence of step 505 and step 507.

Specific plan 5B:

In step 507, the target-side mobility management network element sends a forwarding relocation response message carrying the information of the candidate radio access network network element to the source-side mobility management network element (step 506 is not performed at this time).

Step 506: The target side mobility management network element sends a message to the source side mobility management network element.

For the description of the message sent by the target-side mobility management network element to the source-side mobility management network element, refer to the message sent by the target-side mobility management network element to the candidate mobility management network element in step 505. Description, no longer repeat here.

The message sent by the target-side mobility management network element to the source-side mobility management network element includes the candidate radio access network element information. The candidate radio access network network element information included in the message sent by the target side mobility management network element to the source side mobility management network element may be: all the candidates learned by the target side mobility management network element in step 504. The radio access network network element information; or, the source information of the alternative radio access network element in the range of the source side mobile management network element service. For the process of setting the timer in the source-side mobility management network element, refer to the description of the timer in step 505, and details are not described herein again.

Step 507: The target-side mobility management network element sends a Forward Relocation Response (Forward Relocation Response) message to the source-side mobility management network element.

For the scheme 5B, if the target side mobility management network element learns that the existing radio access network element is not in the service range of the alternative mobility management network element and the target side management network element service (ie, the alternative access When there is one or more candidate access network elements in the network element information, and the mobile management network element served by the candidate access network element is the source-side mobility management network element, the forwarding relocation response The message includes information of the alternate radio access network network element, such as an identification of the alternate radio access network network element.

The information of the candidate radio access network network element included in the message sent by the target side mobility management network element to the source side mobility management network element may be: all the information learned by the target side mobility management network element in step 504. The candidate radio access network network element information; or the alternative radio access network network element information in the range of the source side mobile management network element service.

If the target side mobility management network element learns that the existing radio access network element is not in the service range of the alternative mobility management network element and the target side management network element service (that is, exists in the source side mobility management network element) Within the scope of the service: For the solution 5A, the step 506 and the step 507 are performed, where the original forwarding relocation response message is not included in the step 507, and the network information of the candidate radio access network is not included, which is not limited in this embodiment. The sequence of execution of step 506 and step 507; for scenario 5B, step 507 needs to be performed (step 506 is not performed at this time), and in step 507, the extended forwarding relocation response message includes the information of the candidate radio access network element. .

Step 508: The mobility management network element sends a message to the candidate radio access network network element.

The message sent by the mobility management network element to the candidate radio access network element includes the context of the user equipment. The information, the candidate radio access network element acquires and saves the context information of the user equipment according to the message sent by the mobility management network element.

The message sent by the mobility management network element (source-side mobility management network element or target mobility management network element or candidate mobility management network element) to the candidate access network element may be a handover request (Handover) The request message may be a new S1-AP message, for example, a Handover Preparation message (the present embodiment does not limit the name of the message), and which one of the above messages is used in this embodiment. Make restrictions.

2) The message sent by the mobility management network element to the candidate radio access network element further includes target identification information, such as a target cell ID, if the Target Cell ID does not belong to the current radio access. The network element, the current radio access network element is the candidate radio access network element instead of the target side radio access network element, so that the candidate radio network element receiving the handover request message learns the user Context information of the device and not related processing for performing handover (for example, the user equipment is not allocated corresponding air interface resources).

Step 509: The alternate radio access network network element sends a response message to the mobility management network element.

The response message sent by the network element of the candidate radio access network to the mobility management network element may be an extended handover request acknowledgement message (Handover Request Acknowledge), or may be a new handover preparation response ( Handover Preparation Ack) message, or, may be the original handover request response message. Specifically, the method may include: but not limited to: the message sent by the candidate radio access network element to the mobility management network element further includes a forwarding response indication, for example, forwarding a user equipment context response indication (Forward UE Context Ack Indicator And indicating that the response message is the response message of the step 508, not the handover request response message sent by the target radio access network element where the target cell is located, so that the mobility management network element receiving the handover request response message is confirmed. The candidate wireless network element acquires the context of the user equipment, but does not perform the handover/relocation related operation of the mobility management network element (for example, triggering an Create Indirect Data Forwarding Tunnel or wirelessly connecting to the source side) The network access NE sends a Handover Command message.

The step 509 is optional, and may or may not be performed. This embodiment does not limit this.

Step 510: The alternative mobility management network element sends a response message to the target side mobility management network element.

The response message sent by the candidate mobility management network element to the target-side mobility management network element may be a new message, such as a Forward Relocation Ack (Forward Relocation Ack) message, or may be an extended forwarding. Relocation Should (Reward Response) message. Specifically, the method may include, but is not limited to, the following:

The response message sent by the candidate mobility management network element to the target side mobility management network element further includes a forwarding response indication, such as a Forward UE Context Ack Indicator, indicating that the response message is The response message of step 505 is such that the target mobile management network element receiving the response message confirms that the candidate mobile management network element learns the candidate radio access network element information or confirms that the radio access network element succeeds. Sending the context information of the user equipment to the network element of the radio access network, where the target side mobility management network element does not perform the handover/relocation related operation of the target side mobility management network element (for example, creating a session connection with the serving gateway) .

The step 510 is optional, and may or may not be performed. This embodiment does not limit this.

The step 510 may be performed after the step 505, or may be performed after the step 509 (ie, the candidate radio access network element sends a response message to the alternate mobility management network element), which is not limited in this embodiment. .

Step 511: The source side mobility management network element sends a response message to the target side mobility management network element.

For the description of the response message sent by the source-side mobility management network element to the target-side mobility management network element, refer to the response sent by the candidate mobility management network element to the target-side mobility management network element in step 510. The description of the message is not described here.

The step 511 is optional, and may or may not be performed. This embodiment does not limit this.

The step 511 may be performed after the step 506 or the step 507, or may be performed after the step 509 (that is, the candidate radio access network element sends a response message to the source side mobility management network element). No restrictions.

Step 512: The source side mobility management network element sends a handover command (Hnadover Command) message to the source side radio access network element.

Step 513: Perform the remaining process of the S1 handover, including updating the uplink and downlink user plane transmission path, the tracking area update process, and the like, and details are not described herein again.

Step 514 - Step 519: Refer to step 414 and step 419 in Embodiment 4, and details are not described herein again.

In the embodiment of the present invention, the target side radio access network element obtains the information of the candidate radio access network element in the user equipment handover procedure, and causes the mobility management network element to obtain the information of the candidate radio access network element. And transmitting the context information of the user equipment to the candidate radio access network element by using the mobility management network element, so that the candidate radio access network is guaranteed when the X2 interface is unavailable or not using the X2 interface. The network element learns the context of the user equipment, so that the user equipment may select an alternative wireless access in the context of the user equipment when the handover fails or the handover completes to discover that the wireless link is unavailable. The network element performs the re-establishment process, keeps the session uninterrupted, reduces the dropped call rate, and improves the user experience. Embodiment 6: As shown in FIG. 6, this embodiment provides another method for obtaining a context, which specifically includes:

S1 switching process:

Step 600: The source side radio access network element decision initiates a handover process.

The source side radio access network element receives the measurement report reported by the user equipment, and the decision initiates the handover process, and the target cell of the decision handover. Step 601: The source side radio access network element sends a handover requirement (Handover Required) message to the source side mobility management network element.

After receiving the handover request message, the source-side mobility management network element may obtain the information of the candidate radio access network network element by using the configuration information, which may include but is not limited to the source-side mobility management network. The element will pass its own configuration information or through the network topology according to the source side radio access network element information, the target side radio access network element information, the source side mobility management network element information, and/or the target side mobility management network element information. The information of the source-side mobility management network element is configured by the source-side mobility management network element, and the source-side mobility management network element is configured according to the source-side radio access network element information and/or Or the target side radio access network element information matching configuration information is used to obtain the corresponding neighbor radio access network element information as the candidate radio access network element information, or the source side mobility management network element itself is based on the user equipment. The statistics obtained by the motion trajectory (for example, according to the source side radio access network element information and/or the determined target side radio access network element information) Wireless access network element information.

The candidate radio access network element may include, but is not limited to, all or part of the neighbor radio access network element of the source side radio access network element, and all or part of the target side radio access network element. a neighboring radio access network element, and all or part of the radio access network element in the source-side mobility management network element service, and all or part of the radio access network element in the target-side mobility management network element service area, And at least one of other radio access network elements (ie, within the range of alternative mobility management network elements) that are not within the source and destination side mobility management network element services.

If the target cell of the handover does not belong to the source-side mobility management network element service scope (that is, the MME changes), step 602 is performed; if the MME does not change and the learned candidate radio access network element is not on the source side, If the MME does not change and the candidate radio access network element is in the range of the mobility management network element service (that is, it exists in the range of the candidate mobility management network element service), step 603 is performed. In the range of the source-side mobility management network element service, step 605 is performed (step 602-step 604 is not performed).

Steps 602-613: Refer to the description of steps 402-413 in the fourth embodiment, and the details are not described herein again.

Step 614 - Step 619: Refer to step 414 and step 419 in Embodiment 4, and details are not described herein again.

In the embodiment of the present invention, the source-side mobility management network element learns the information of the candidate radio access network network element in the user equipment handover procedure, and causes at least one of the target-side mobility management network element and the candidate mobility management network element. Obtaining the information of the candidate radio access network network element, and sending the context information of the user equipment to the network element of the candidate radio access network by using the mobility management network element, so that the X2 interface is unavailable or not used. In the case of the interface, the user equipment of the candidate radio access network is informed that the context of the user equipment is obtained, so that the user equipment may be in the learning station when the handover fails or the handover completes to discover that the radio link is unavailable. The alternate radio access network element that describes the context of the user equipment performs a re-establishment process, keeps the session uninterrupted, reduces the dropped call rate, and improves the user experience. Embodiment 7: As shown in FIG. 7, this embodiment provides another method for obtaining a context, which specifically includes:

S1 switching process:

Step 700: The source side radio access network element decision initiates a handover process. The source side radio access network element receives the measurement report reported by the user equipment, initiates a handover process, and decides to switch the target cell.

Step 701: The source side radio access network element sends a handover requirement message to the source side mobility management network element.

Step 702: The source side mobility management network element sends a forwarding relocation request to the target side mobility management network element (Forwarding

Relocation Request) message.

After receiving the forwarding relocation request message, the target mobility management network element may obtain the information of the candidate radio access network network element by using configuration information, which may include but is not limited to target-side mobility. The management network element will pass its own configuration information according to at least one of the source side radio access network element information, the target side radio access network element information, the source side mobility management network element information, and the target side mobility management network element information. Alternatively, the network information of the candidate radio access network is obtained through the network topology information. For example, the target side mobility management network element itself configures the neighbor radio access network element information, and the target side mobility management network element is based on the source side radio access network. The network element information and/or the determined target side radio access network element information matching configuration information acquires the corresponding neighbor radio access network element information as the candidate radio access network element information, or the target side mobility management network element The self is counted according to the motion trajectory of the user equipment (for example, according to the source side radio access network element information and/or the target side of the decision is not Access network element information) Alternatively, the radio access network element information derived.

Step 703: The target side mobility management network element sends a handover request (Handover Request) message to the target side radio access network element.

Step 704: The target side radio access network element sends a handover request acknowledgement (Handover Request Acknowledge) message to the target side mobility management network element.

Step 705: The target side mobility management network element sends a message to the alternative mobility management network element.

The message sent by the target-side mobility management network element to the candidate mobility management network element may be a Forwarding Relocation Request message, or may be a new message, such as forwarding a relocation request ( Forward Relocation Required) The message (the implementation does not limit the name of the message). Which message is used in this embodiment is not limited in this embodiment.

The message sent by the target-side mobility management network element to the candidate mobility management network element includes the candidate radio access network element information and the user equipment context information. The candidate radio access network network element information included in the message sent by the target side mobility management network element to the candidate mobility management network element may be: all the candidates learned by the target side mobility management network element in step 702. Radio access network network element information; or alternative radio access network network element information within the scope of the alternative mobility management network element service.

The message sent by the target-side mobility management network element to the candidate mobility management network element specifically includes but is not limited to the following methods: 1) The message sent by the target-side mobility management network element to the candidate mobility management network element further includes a forwarding indication, such as a Forward UE Context Indicator, indicating that the message is used to forward the context of the user equipment. Forwarding the relocation request or forwarding the relocation request message, so that the candidate mobility management network element that receives the forwarding relocation request or the forwarding relocation requirement message learns the context of the user equipment and the information of the candidate radio access network network element, However, the handover/relocation related operations of the target side mobility management network element are not performed (for example, creating a session connection with the serving gateway); or,

The execution sequence of step 705 is not limited in this embodiment, that is, it can be performed at any time after step 702 (not limited to after step 703 or before step 706).

In addition, if the target side mobility management network element learns that the existing radio access network element is not in the service range of the alternative mobility management network element and the target side management network element service (that is, exists in the source side mobility management network element) Within the scope of the service, the target-side mobility management network element needs to send a message carrying the information of the candidate radio access network network element to the source-side mobility management network element. The embodiment does not limit the execution order in which the target-side mobility management network element sends a message to the source-side mobility management network element and the target-side mobility management network element sends a message to the candidate mobility management network element (ie, does not limit step 705). Step 706 and the execution order of step 707).

Specific plan 7A:

Step 706 and step 707 are performed. In step 706, the target-side mobility management network element sends a message carrying the information of the candidate radio access network element to the source-side mobility management network element. This embodiment does not limit step 706 and step 705. The order of execution.

Specific plan 7B:

In step 707, the target-side mobility management network element sends a forwarding relocation response message carrying the information of the candidate radio access network network element to the source-side mobility management network element (step 706 is not performed).

Step 706: The target side mobility management network element sends a message to the source side mobility management network element.

For the description of the message sent by the target-side mobility management network element to the source-side mobility management network element, refer to the message sent by the target-side mobility management network element to the candidate mobility management network element in step 705. Description, no longer repeat here.

The message sent by the target-side mobility management network element to the source-side mobility management network element includes the candidate radio access network element information. The candidate radio access network element included in the message sent by the target side mobility management network element to the source side mobility management network element The information may be: all candidate radio access network element information obtained by the target-side mobility management network element in step 702; or the alternative radio access network element information in the source-side mobility management network element service range . For the process of setting a timer in the source-side mobility management network element, refer to the description of the timer in step 705, and details are not described herein again.

Step 707: The target-side mobility management network element sends a Forward Relocation Response (Forward Relocation Response) message to the source-side mobility management network element.

For the scheme 7B, if the target side mobility management network element learns that the existing radio access network element is not in the service range of the alternative mobility management network element and the target side management network element service (ie, the alternative access When there is one or more candidate access network elements in the network element information, and the mobile management network element served by the candidate access network element is the source-side mobility management network element, the forwarding relocation response The message includes information of the alternate radio access network network element, such as an identification of the alternate radio access network network element.

The information of the candidate radio access network network element included in the message sent by the target-side mobility management network element to the source-side mobility management network element may be: all the information learned by the target-side mobility management network element in step 702. The candidate radio access network network element information; or the alternative radio access network network element information in the range of the source side mobile management network element service.

If the target side mobility management network element learns that the existing radio access network element is not in the service range of the alternative mobility management network element and the target side management network element service (that is, exists in the source side mobility management network element) Within the scope of the service: For the solution 7A, the step 706 and the step 707 are performed, where the original forwarding relocation response message is not included in the step 707, and the network element information of the candidate radio access network is not included, which is not limited in this embodiment. Step 706 and step 707 are performed. For scheme 7B, step 707 needs to be performed (step 706 is not performed). In step 707, the extended forwarding relocation response message includes the candidate radio access network element information.

Steps 708-713: The descriptions of the steps 508-513 in the fifth embodiment are not described herein again.

Step 714 - Step 719: Refer to step 414 and step 419 in Embodiment 4, and details are not described herein again.

In the embodiment of the present invention, the target side mobility management network element learns the information of the candidate radio access network network element in the user equipment handover procedure, and causes at least one of the source side mobility management network element and the candidate mobility management network element. Acquiring the information of the candidate radio access network network element, and obtaining the information of the candidate radio access network network element in the user equipment handover process by using the mobility management network element, and using the mobility management network element to select the The network element of the radio access network sends the context information of the user equipment, so that if the X2 interface is unavailable or does not use the X2 interface, the network element of the candidate radio access network is ensured to learn the context of the user equipment, so that the When the user equipment finds that the radio link is unavailable, the user equipment may perform a re-establishment process on the candidate radio access network network element that learns the context of the user equipment, and keep the session uninterrupted and reduced. Voice rate, improve the user experience. The eighth embodiment of the present invention provides a mobility management network element. The mobility management network element includes: an obtaining unit 80 and a message sending unit 81.

The obtaining unit 80 is configured to acquire information about the network element of the candidate radio access network;

When the mobility management network element is used as the source-side mobility management network element of the user equipment handover, the obtaining, by the acquiring unit 80, the network element information of the candidate radio access network includes: sending the source-side radio access network element to send The handover request message, the handover requirement message carries the information of the candidate radio access network network element; or, according to the configuration, the information of the candidate radio access network network element is obtained; or, the receiving destination a message sent by the target mobility management network element, where the message sent by the target mobility management network element carries the information of the candidate radio access network network element;

When the mobility management network element is used as the target side mobility management network element of the user equipment handover, the obtaining, by the acquiring unit 80, the candidate radio access network network element information includes: receiving the message sent by the source side mobility management network element The message sent by the source-side mobility management network element carries the information of the network element of the candidate radio access network; or, the information about the network element of the candidate radio access network is obtained according to the configuration; or, the network element of the target-side radio access network is received. a handover request response message, where the handover request response carries an alternative radio access network element information

When the mobility management network element is used as the candidate mobility management network element for the user equipment handover, the acquiring unit 80 acquiring the candidate radio access network network element information includes: receiving the source side mobility management network element or the target side a message sent by the mobile management network element, where the message sent by the source-side mobility management network element or the target-side mobility management network element carries the information of the candidate radio access network network element and the context of the user equipment;

The message sending unit 81 is configured to send a message to the candidate radio access network network element included in the candidate radio access network element information, where the message includes a context of the user equipment.

In the embodiment of the present invention, the network element of the alternative radio access network is defined as a user equipment in the handover process, in order to avoid that the user equipment fails to switch or the radio link is found to be unavailable after the handover is completed, and the selected storage is performed. A radio access network element of the user equipment context information (which does not include the target radio access network element). The identifier of the one or more candidate radio access network elements may be included in the network element information of the candidate radio access network, which is not limited in this embodiment.

The alternative mobility management network element refers to other mobility management network elements except the source side mobility management network element and the target side mobility management network element.

In this embodiment, the mobility management network element sends the context of the user equipment to one or more candidate radio access network NEs, so that the alternative radio access is guaranteed when the Χ2 interface is unavailable or the Χ2 interface is not used. The network element learns the context of the user equipment, so as to ensure that the session service of the user equipment is not interrupted after the handover is completed. The ninth embodiment of the present invention provides a radio access network element. As shown in FIG. 9, the radio access network element includes: a first receiving unit 90, an identifying unit 91, a second receiving unit 92, and resource allocation. Unit 93;

The first receiving unit 90 is configured to receive a message, where the message carries a context of the user equipment;

The identifying unit 91 is configured to identify whether the message received by the first receiving unit 90 is used to forward a context of the user equipment; the message received by the first receiving unit 90 includes a handover preparation message or a handover request message, where The identification unit 91 identifies whether the message received by the first receiving unit 90 is used to forward the context of the user equipment, including:

The handover preparation message or the handover request message carries a forwarding user equipment context indication, and the identification unit identifies the handover preparation message or the handover request according to the forwarding user equipment context indication carried in the handover preparation message or the handover request message. The message is used to forward the context of the user equipment. Or

The handover preparation message or the handover request message carries a target identifier, and the identification unit identifies the handover preparation message or the handover request message for forwarding the user equipment according to the target identification information carried in the handover preparation message or the handover request message. The context, that is, the radio access network element is not the destination access network element. a second receiving unit 92, configured to receive a radio resource control message sent by the user equipment;

The resource allocation unit 93 is configured to allocate an air interface to the user equipment after the identifier unit 91 identifies that the message is a context for forwarding the user equipment, and the second receiving unit 92 receives the radio resource control message of the user equipment. Resources. That is, the resource allocating unit 93 does not allocate the air interface resource to the user equipment, but receives the radio resource control sent by the user equipment, when the identifier unit 91 identifies that the message is the context for forwarding the user equipment. In the case of a message, the user equipment is allocated an air interface resource.

In the embodiment of the present invention, the network element of the radio access network receives the message carrying the context of the user equipment, and learns that the message is the context of forwarding the user equipment, and does not allocate the air interface resource. When the user equipment fails to switch or switch After the discovery of the radio link is unavailable, after receiving the radio resource control message of the user equipment, the user equipment is allocated an air interface resource to ensure that the user equipment switching session service is not interrupted, and the air interface resource is saved.

In summary, the embodiment implements that the mobility management network element sends the context of the user equipment to one or more candidate radio access network NEs, so that the X2 interface is unavailable or does not use the X2 interface. The network element of the user equipment is informed by the network element of the candidate radio access network, so that the session service of the user equipment is not interrupted after the handover is completed.

In addition, the candidate radio access network element does not allocate an air interface resource after learning the context of the user equipment, and if the user equipment fails to switch or the handover completes to find that the radio link is unavailable, if the user equipment is camped When the one of the candidate radio access network elements is used, the user equipment can be successfully re-established to the candidate radio access network element to ensure that the session service is not interrupted and the air interface resource is saved.

It will be understood by those skilled in the art that all or part of the steps of the above embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium.

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 method for processing a context, comprising:

The source-side mobility management network element receives the handover requirement message sent by the network element of the source-side radio access network, where the handover requirement message carries the information of the candidate radio access network network element; or the source-side mobility management network element configures according to the self-configuration Obtaining the information of the candidate radio access network network element; or, the source-side mobility management network element receives the message sent by the target-side mobility management network element, and the message sent by the target-side mobility management network element carries the alternative radio access Network element information;

2. The method according to claim 1, wherein the source-side mobility management network element receives a message sent by the target-side mobility management network element, and the message-bearing device sent by the target-side mobility management network element The information of the radio access network element includes: the source-side mobility management network element receives a forwarding relocation response message sent by the target-side mobility management network element, where the forwarding relocation response message carries an alternative radio access network Network element information; or,

The source-side mobility management network element receives a forwarding relocation requirement message sent by the target-side mobility management network element, where the forwarding relocation requirement message carries the candidate radio access network element information.

The method according to claim 1, wherein the source-side mobility management network element sends a message to the candidate radio access network element as a handover preparation message or a handover request message.

The method of claim 3, wherein the handover preparation message or the handover request message further carries a forwarding user equipment context indication, the method further comprising:

The network element of the candidate radio access network learns that the handover preparation message or the handover request message is used to forward the context of the user equipment according to the forwarding user equipment context indication carried in the handover preparation message or the handover request message.

The candidate radio access network network element acquires a context of the user equipment.

The method of claim 3, wherein the handover preparation message or the handover request message further carries a target identifier, the method further comprising:

The network element of the candidate radio access network determines that the network element of the candidate radio access network is not the target side radio access network element according to the target identifier information carried in the handover preparation message or the handover request message;

The method of claim 4 or 5, wherein the acquiring, by the candidate radio access network element, the context of the user equipment comprises:

Receiving, by the candidate radio access network element, a radio resource control message sent by the user equipment;

The candidate radio access network network element allocates air interface resources to the user equipment.

7. A method for processing a context, the method comprising:

The target-side mobility management network element receives the message sent by the source-side mobility management network element, and the message sent by the source-side mobility management network element carries the information of the candidate radio access network network element; or, the target-side mobility management network element is configured according to The configuration of the alternative radio access network element information is obtained by the self-configuration; or the target-side mobility management network element receives the handover request response message sent by the network element of the target-side radio access network, where the handover request response carries the alternative radio access network Network element information; The target-side mobility management network element sends a message to the candidate radio access network element included in the candidate radio access network element information, where the message sent by the target-side mobility management network element includes the user equipment. Context.

The method according to claim 7, wherein the target-side mobility management network element receives a message sent by the source-side mobility management network element, and the message-bearing device sent by the target-side mobility management network element The information of the radio access network element includes: the target side mobility management network element receives a forwarding relocation request message sent by the source side mobility management network element, where the forwarding relocation request message carries an alternative radio access network Network element information; or,

The target-side mobility management network element receives the forwarding relocation requirement message sent by the source-side mobility management network element, where the forwarding relocation requirement message carries the candidate radio access network element information.

The method according to claim 7, wherein the target side mobility management network element sends a message to the candidate radio access network element as a handover preparation message or a handover request message.

The method of claim 9, wherein the handover preparation message or the handover request message further carries a forwarding user equipment context indication, the method further comprising:

The method according to claim 9, wherein the handover preparation message or the handover request message further carries a target identifier, the method further includes: the candidate radio access network network element is prepared according to the handover Determining, by the target identifier information carried in the message or the handover request message, that the candidate radio access network element is not the target side radio access network element;

The method according to claim 10 or 11, wherein the acquiring, by the candidate radio access network element, the context of the user equipment comprises:

13. A method for processing a context, the method comprising:

The method according to claim 13, wherein the candidate mobility management network element receives a message sent by the source side mobility management network element or the target side mobility management network element, and the source side mobility management network element Or the message sent by the target-side mobility management network element carrying the information of the candidate radio access network network element specifically includes:

The method according to claim 13, wherein the candidate mobility management network element sends a message to the candidate radio access network element as a handover preparation message or a handover request message.

The method of claim 15, wherein the handover preparation message or the handover request message further carries a forwarding user equipment context indication, the method further comprising:

The method of claim 15, wherein the handover preparation message or the handover request message further carries a target identifier, the method further comprising:

The method according to claim 16 or 17, wherein the acquiring, by the candidate radio access network element, the context of the user equipment comprises:

19. A mobility management network element, comprising:

20. A mobility management network element, comprising:

21. A mobility management network element, comprising:

The acquiring unit, configured to obtain the information of the network element of the candidate radio access network, includes: receiving a message sent by the source-side mobility management network element or the target-side mobility management network element, where the source-side mobility management network element or the target-side mobility management network The message sent by the element carries the alternative wireless access The network element information and the context of the user equipment;

And a message sending unit, configured to send a message to the candidate radio access network element included in the candidate radio access network element information, where the message includes a context of the user equipment.

22. A radio access network element, comprising:

a first receiving unit, configured to receive a message, where the message carries a context of the user equipment;

The radio access network network element according to claim 22, wherein the message received by the first receiving unit includes a handover preparation message or a handover request message, and the handover preparation message or the handover request message carries the forwarding The user equipment context indication, the identification unit identifies the handover preparation message or the handover request message for forwarding the context of the user equipment according to the forwarding user equipment context indication carried in the handover preparation message or the handover request message.

The radio access network network element according to claim 22, wherein the message received by the first receiving unit includes a handover preparation message or a handover request message, and the handover preparation message or the handover request message carries a target identifier. The identification unit identifies the handover preparation message or the handover request message for forwarding the context of the user equipment according to the target identification information carried in the handover preparation message or the handover request message.