WO2008077314A1

WO2008077314A1 - Method of negotiating about the resources, terminal, access network and communication system thereof

Info

Publication number: WO2008077314A1
Application number: PCT/CN2007/003729
Authority: WO
Inventors: Jing Liu; Yan Peng; Bin Xia
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-12-22
Filing date: 2007-12-21
Publication date: 2008-07-03
Also published as: CN101207916A; CN101207916B

Abstract

The present invention discloses a method of negotiating about the resources, a terminal, an access network and a communication system thereof, for improving the process of negotiating about the resources in the media independent handover. In the present invention, the terminal device sends the information for querying the resources to the corresponding serving access network in the media independent handover; the serving access network requests a candidate access network based on the information for querying the resources and obtains the actually available resources information of the candidate access network. Thus, it can make two terminalsnormally negotiate about the resources in the media independent handover process, so as to make the whole handover flow normally be performed.

Description

Method, terminal, access network and communication system for resource negotiation

The present invention relates to the field of communications, and in particular, to a technology for performing resource negotiation. Background technique

The development of communication technology is changing with each passing day, and various new access technologies are emerging one after another. Different networks also have adaptive coverage and application scenarios. In order to realize ubiquitous communication services, multi-mode terminals supporting multiple access methods have emerged, and at the same time, how the user terminals seamlessly switch and roam between these heterogeneous networks has become increasingly prominent. In order to solve the user's network in the shield, for example, including

IEEE8022.3, IEEE802.il, IEEE802.16 and other 802 networks and seamless switching between 3GPP (3rd Generation Partnership Project) and 3GPP2 cellular networks, IEEE 802 wireless working group was established The IEEE 802.21 working group regulates the requirements for switching between different standards and the corresponding switching mechanisms.

The purpose of the IEEE 802.21 standard development is to provide a handover process between different media types, to enhance the user's experience of the mobile device by supporting switching between different media types, and the goal is to finally enable the mobile device to automatically select when roaming between networks. The best type of network connection and seamlessly switch paths without user intervention. In general, terminals and networks, such as base stations, PoA (Point of Attachment), may be multi-mode, that is, support different wireless standards, and sometimes voice and data transmission can be performed simultaneously on multiple interfaces. Today's mobile communication networks have evolved into micro-cellular (IEEE 802.11) and macro-cellular (3GPP, 3GPP2, IEEE 802.16), which may overlap each other, and handover may occur between different types of networks. Handovers are typically based on measurements and triggers at the end of the link layer, including measurements such as signal quality, transmission errors, and service types.

The IEEE 802.21 media-independent handover solution introduces a framework that ensures continuity of service switching between different media types. To achieve seamlessness and continuity of such handovers, a set of handovers between network elements is required. Feature set. Configure these switching functions in the mobility management protocol stack of the network element. The set forms a new protocol functional layer called the MIHF (Media Independent Handover Function) module. The location and key services of the MIHF module in the mobility management protocol stack are shown in Figure 1. The MIHF module is logically defined as a thin layer in the mobility management protocol stack of the terminal and the network, which helps in the handover decision process. Function; For multi-mode terminals, the MIHF module provides some necessary information for the upper layer to make handover decisions and how to effectively make handover decisions. The upper layer performs handover decisions and link selection based on the input and context of the MIHF module, thereby achieving seamless handover; The Media Independent Handover (MIH) functional entity mainly provides the following services to help the user's switching process:

Media Independent Event Service (MIES): Provides classification, filtering, and reporting of dynamic change events regarding link characteristics, link status, and link quality;

Media Independent Command Service (MICS): Provides means for MIH user modules to manage and control link behavior related to handover and mobility;

Media Independent Information Service (MIS): Provides detailed information on the characteristics and services of the service access network and surrounding networks. This information is used for effective system access and handover decisions.

The MIH User module is a mobility management and application protocol layer belonging to Layer 3, including MIPv4/v6 (Mobile Internet Protocol), SIP (Session Initiated Protocol) and other mobility management protocols and handovers. Strategy, transfer and application, etc.

The MIHF module is a media-independent switching protocol layer that provides command services, event services, and information services. Below the MIHF module are link layers for various access networks, such as link layers such as 802.3, 802.11, 802.16, and 3GPP.

The main function of the MIHF module is the media-independent switching function provided by the event service, the command service and the information service. This independence is achieved by providing a unified interface to the upper layer through the lower layer protocol in the mobility management protocol stack, so that the upper layer The processing of the protocol does not depend on the specific characteristics and characteristics of the terminal and the wireless network.

In the prior art, the MIH user module and the local MHF module interact with each other through MH_SAP (Service Access Point) primitives, including events, commands, and information. Primitive. The MIHF messages are exchanged between the local and remote peer MIHF modules.

In order to assist the switching network selection and resource allocation functions during the handover process, and better support the seamless handover, the terminal and the network side need to negotiate resources before the handover decision, especially according to the switched device or user. The resource utilization required for the session, whether it is possible to switch before switching, and the quality of communication that can be supported in the past.

In the draft of the existing IEEE802.21 technology, a set of four primitives and a pair of messages related to the negotiation of resources are defined, and the primitives and message interactions of the initial trigger are switched in the media independent switching process. Figure 2 depicts the communication flow between two peer MIH user modules, where 1, 3, 4, and 6 are the four primitives that interact between the local upper and lower layers, and 2, 5 are between the two peer MIHF modules. A pair of messages that interact. Through the interaction of the above primitives and messages, the process of switching preparation, decision and execution of the terminal and the network is triggered. The four primitives and a pair of messages shown in Figure 2 are:

(1) Primitive 1 is a media independent handover candidate access network query request;

When the terminal triggers media independent handover, the media independent handover candidate access network query request is MIH_MN_HO_Candidate_Query.request; when the network side triggers media independent handover, the media independent handover candidate access network query request is MIH_Net_HO_Candidate — Query.request, the parameters defined by the two primitives are the same.

The primitive definition of the command contains some parameters for identification, such as: Sourceldentifier, Destinationldentifier, CurrentLinkldentifier, etc., mainly including two parameters QueryResourceList (query) The resource list) and QueryResourceListFlag (query resource list tag) are used to represent the query resource information and the query resource information tag information, respectively. Switching can be triggered either by the terminal or by the service access network. In the case that the terminal triggers the handover, the terminal can query the candidate access network for the required resources by using the QueryResourceList parameter. When the network side triggers the handover, the PoS of the service access network uses the QueryResourceListFlag parameter to indicate whether the terminal needs to be provided. Each candidate access network queries for the required resources.

The primitive corresponds to the message 2, and the message 2 is the media-independent handover candidate access network query request message, but currently, only the media-independent handover candidate access network query request is defined in the message. Some parameters included in the language, including SuggestedNewLinkldentifier, SuggestedMACNewPoAIdentifier (Media Access Control Address of PoA of the new network), HandoverMode (switch mode) and OldLinkAction (behavior of the old link).

(2) primitive 3 is a media independent handover candidate access network query indication;

When the terminal triggers the media independent handover, the media independent handover candidate access network query indication is MIH_MN_HO_Candidate_Quer. indication; when the network side triggers the media independent handover, the media independent handover candidate access network query indication is MIH_Net_HO_Candidate_Quer. indication, the two The parameters defined by the primitive are the same.

The command is used to notify the local user module that the handover candidate access network query request message sent by the peer MIHF module has been received.

The primitive definition of the command is basically the same as the media independent handover candidate access network query request primitive parameter, but does not include the QueiyResourceList parameter.

(3) Primitive 4 is a media independent handover candidate access network query response;

When the terminal triggers the media independent handover, the media independent handover candidate access network query response is: H—MN—HO—Candidate— Query, response; when the network side triggers the media independent handover, the media independent handover candidate access network query The response is MIH—Net_HO—Candidate_Quei . response, the parameters defined by the two primitives are the same.

This command is used to respond to the media independent handover candidate access network query request command. The primitive definition of the command contains some parameters for identification (such as Sourceldentifier, Destinationldentifier, CurrentLinkldentifier, etc.), and mainly includes two parameters QueryResourceList and AvailableResourceList (the actual available resource list), where the actual available resource list is used to represent Actual available resource information collected from each candidate access network.

The primitive corresponds to message 5, and message 5 is a media-independent handover candidate access network query response message, but the message only defines some parameters included in the media-independent handover candidate access network query response primitive, including HandoverAck (switch mode) ), PreferredLinkldentifier (Identification of the new link), PreferredPoAIdentifier (identification of the new network PoA), and ErrorCode (error reason).

(4) Primitive 6 is a media independent handover candidate access network query confirmation. When the terminal triggers media independent handover, the media independent handover candidate access network query is confirmed as

MIH—MN—HO—Candidate— Query, confirm; When media-independent handover is triggered on the network side, the media-independent handover candidate access network query is confirmed as MIH—Net—HO—Candidate_Queiy. confirm, the parameters defined by the two primitives the same.

The command is used to notify the local MIH user module that the switch candidate access network query response message sent by the peer MIHF module has been received.

The primitive definition of the command is basically the same as the media independent handover candidate access network query response primitive parameter, but does not include the QueryResourceList parameter.

It can be seen that the four primitives related to the media-independent handover negotiation resource and the corresponding pair of messages have inconsistent parameter definitions. The two peer MIH user modules cannot be used only through the definition of the existing four primitives and corresponding messages. The negotiation of the resource request causes the entire switching process to fail. Specifically, there are several major issues:

A. The two peer MIH user modules cannot negotiate the resource query request, and thus cannot complete the interaction between the query resource information and the actual available resource list information.

B. For the terminal, it is impossible to make the handover decision making only through these actually available resource information. In this case, when there are multiple candidate access networks, it is impossible to clarify the resources that each candidate access network can provide.

It can be seen that in the process of the existing MIH negotiation, the negotiation process cannot be realized due to the problems related to the negotiation-related messages and the parameters in the primitive. Summary of the invention

The present invention provides a method for performing resource negotiation, a terminal, an access network, and a communication system for improving a resource negotiation process in media independent handover.

In order to solve the above technical problem, a specific embodiment of the present invention provides a method for performing resource negotiation, including:

The terminal device sends the query resource information to the corresponding service access network in the media independent handover. The service access network requests and obtains actual available resource information of the candidate access network according to the query resource information.

A specific embodiment of the present invention further provides a terminal device, where the terminal device includes a media independent switching MIH user module and a media independent switching function MIHF module, where:

The MIH user module sends query resource information to the MIHF module in media independent handover;

The MIHF module sends the query resource information to a corresponding service access network.

The embodiment of the present invention further provides an access network, where the access network includes a media independent switching MIH user module and a media independent switching function MIHF module, where:

The MIHF module receives the query resource information sent by the terminal device, and sends the query resource information to the MIH user module.

And the MIH user module requests and obtains actual available resource information of the candidate access network according to the query resource information.

The embodiment of the present invention further provides a communication system, where the system includes: a terminal device, configured to send query resource information in media independent handover;

An access network, configured to connect the terminal device to a network, where:

Receiving, by the service access network corresponding to the terminal device, the query resource information, and sending a request for actual available resource information according to the query resource information;

The candidate access network transmits actual available resource information to the service access network in accordance with the request.

The beneficial effects of the specific embodiments of the present invention are as follows:

The terminal device sends the query resource information to the corresponding service access network in the media independent handover; the service access network requests and obtains the actual available resource information of the candidate access network according to the query resource information. The technical solution of the present invention can prevent the two peers from performing normal resource negotiation during the media independent switching process, so that the entire switching process can be performed normally.

DRAWINGS 1 is a schematic diagram of a location and a key service of a MIHF module in a mobility management protocol stack in the prior art;

Figure 2 is a schematic diagram of the communication process between two peer MIH user modules;

3 is a flowchart of negotiating resources in a media-independent handover process according to Embodiment 1 of the present invention; FIG. 4 is a flowchart of negotiating resources in a media-independent handover process according to Embodiment 2 of the present invention; A flowchart of negotiating resources in a non-switching process; Figure 6 is a block diagram of a communication system in one embodiment of the present invention.

detailed description

In the embodiment of the present invention, the terminal device sends the query resource information to the corresponding service access network in the medium-independent handover; the service access network requests the candidate access network according to the query resource information, and obtains the actual availability of the candidate access network. Source information.

The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

Embodiment 1

In this embodiment, the handover is triggered by the terminal, and the handover decision is made by the terminal.

In this embodiment, the process of negotiating resources in the media independent handover process is as shown in FIG. 3, and includes the following steps:

Step S101: The MIH user module of the terminal sends a media independent handover candidate access network query request primitive carrying the query resource information to the MIHF module of the terminal;

Step S102: After receiving the primitive, the MIHF module of the terminal sends the query resource information to the peer MIHF module, that is, the MIHF module of the service access network, by using the corresponding media independent handover candidate access network query request message;

The parameter of the query resource information is not included in the existing media-independent candidate access network query request message to carry the query resource information. Therefore, in this embodiment, the media independent handover candidate access network query request message is required. The parameter of the query resource information is used to carry the query resource information to ensure the smooth progress of the resource negotiation process. Step S103: After receiving the message, the MIHF module of the service access network extracts the query resource information and reports the query resource information to the MIH user of the service access network by using the media independent handover candidate access network query indication primitive. Module

Because the MIH user module of the service access network needs to trigger the request for obtaining the actual available resource information to each candidate access network, the MIH user module of the service access network should know the query resource information, and thus to each candidate access network. Acquiring the actual available resource information corresponding to the query resource information, in this embodiment, querying, by the media independent handover candidate access network, a parameter indicating the primitive definition query resource information, which is used to carry the query resource information, so that the service access network The MIH user module can obtain the query resource information, so that the query resource information can be sent to the candidate access network.

Step S104: The MIH user module of the service access network requests the actual available resource information of the candidate access network from each candidate access network through the MIHF module of the service access network according to the received query resource information.

Step S105, the candidate access network returns the actual available information to the MIHF module of the service access network, and reports the actual available resource information to the MIH user module of the service access network through the MIHF module of the service access network;

Step S106: The MIH user module of the service access network queries the response primitive through the media independent handover candidate access network, and the actual available resource information obtained from each candidate access network and the actual available resource information correspond to the identifier of the candidate access network. The information is sent to the HF module of the service access network; Step S107, after receiving the media independent handover candidate access network query response primitive, the MHF module of the service access network queries the response primitive through the media independent handover candidate access network Corresponding media-independent handover candidate access network query response message, and returning the actual available resource information and the ID (identification information) of the candidate access network corresponding to the actual available resource information to the MIHF module of the terminal; in the prior art, the media The irrelevant handover candidate access network query response message and the actual available resource information parameter carried in the primitive do not correspond to the candidate access network to which it belongs. In the case that the handover decision is required by the terminal, the terminal only knows the actual available resource information. I don’t know that the candidate access network to which it belongs is not available. It's used to make switching decisions. Therefore, in this embodiment, the actual available resource information may be associated with the corresponding candidate access network in the MIHF module of the serving access network; and the associated actual information is carried in the media independent handover candidate access network query message. The available resource information and the actual available resource information correspond to the identification information of the candidate access network, and the terminal can use the available resource information and the actual available resource information corresponding to the identification information of the candidate access network to formulate a handover decision.

Step S108: The MIHF module of the terminal queries the confirmation primitive by the media-independent handover candidate access network, and reports the actual available resource information and the identifier information of the candidate available access network to the MIH user module of the terminal for The terminal MIH User Module is used when making handover decisions.

It can be seen that, in the technical solution of the embodiment, when the handover is triggered by the terminal and the handover decision is made by the terminal, the resource negotiation of the media independent handover can be correctly implemented.

Embodiment 2

In this embodiment, the handover is triggered by the terminal, and the handover decision is made by the network side.

In this embodiment, the process of negotiating resources in the MIH process is as shown in FIG. 4, and includes the following steps:

Step S201: The MIH user module of the terminal sends a media independent handover candidate access network query request primitive carrying the query resource information to the MIHF module of the terminal;

Step S202: After receiving the media independent handover candidate access network query request primitive sent by the MIH user module of the terminal, the MIHF module of the terminal sends the query resource information to the pair by using the corresponding media independent handover candidate access network query request message. Terminal HF module;

Step S203: After receiving the media independent handover candidate access network query request message, the MHF module of the service access network extracts the query resource information and reports the query resource information to the media independent handover candidate access network query indication primitive. Serving the MIH user module of the access network; Step S204, the MIH user module of the service access network requests the actual available resources of the candidate access network to each candidate access network through the MHF module of the service access network according to the received query resource information. Information

Step S205, the candidate access network returns the actual available letter to the MIHF module of the service access network. And transmitting the actual available resource information to the H user module of the service access network through the MIHF module of the service access network, and the MIH user module of the service access network is used when making the handover decision;

Step S206: The MIH user module of the service access network sends the media independent handover candidate access network query response primitive to the MIHF module of the service access network;

In this step, the media independent handover candidate access network query response primitive may optionally carry the actual available resource information obtained from each candidate access network and the actual available resource information corresponding to the identifier of the candidate access network.

Step S207, after receiving the media independent handover candidate access network query response primitive sent by the MIH user module of the service access network, the MIHF module of the service access network returns the media independent handover candidate access network query response message to the terminal. MIHF module;

In this step, the media-independent handover candidate access network query response message may optionally carry the actual available resource information and the actual available resource information corresponding to the identifier of the candidate access network.

Step S208: The MIHF module of the terminal reports the media independent handover candidate access network query confirmation primitive to the MIH user module of the terminal.

In this step, the media-independent handover candidate access network query confirmation primitive optionally carries the actual available resource information and the actual available resource information corresponds to the identifier of the candidate access network.

It can be seen that, in the technical solution of the embodiment, when the handover is triggered by the terminal and the handover decision is made by the network side, the resource negotiation of the media independent handover can be correctly implemented.

Embodiment 3

In this embodiment, the handover is triggered by the network side, and the handover decision is made by the network side.

In this embodiment, the process of negotiating resources in the MIH process is as shown in FIG. 5, and includes the following steps:

Step S301: The MIH user module of the service access network sends a media independent handover candidate access network query request primitive to the MHF module of the service access network according to whether the terminal needs to provide the query resource information, and the MIH candidate access network query request original The language carries the corresponding query resource tag information; in this step, the H user module of the service access network may according to whether the terminal exists locally Query resource information to determine whether the terminal needs to provide query resource information.

Step S302: The MIHF module of the service access network sends a media no-switch handover candidate access network query request message to the MIHF module of the terminal, where the MIH candidate access network query request message carries the query resource tag information;

The query resource tag parameter is not defined in the media independent handover candidate access network query request message. Therefore, in this embodiment, the query resource tag parameter needs to be defined for the media independent handover candidate access network query request message. To carry the query resource tag information to ensure the smooth progress of the resource negotiation process.

Step S303, after receiving the message, the MIHF module of the terminal extracts the query resource tag information, and queries the MIH user module that the indication primitive is reported to the terminal through the media independent handover candidate access network;

Step S304, the MIH user module of the terminal determines whether the query resource tag information needs to provide the query resource information by the terminal, and if yes, carries the query resource information in the media-independent handover candidate access network query response primitive, and sends the MIHF module to the terminal. Otherwise, the query resource information does not need to be carried in the media independent handover candidate access network query response primitive of the MIHF module sent to the terminal;

Step S305, the MIHF module of the terminal sends the media independent handover candidate access network query response message to the MIHF module of the service access network;

If the media-independent handover candidate access network query response primitive carries the query resource information, the media-independent handover candidate access network response message should also carry the query resource information, otherwise the query resource information does not need to be carried.

Since the parameters of the query resource information are not defined in the existing media-independent handover candidate access network query response message, in this embodiment, the parameter of the query resource information needs to be defined for the media-independent handover candidate access network query response message. , used to carry query resource information to ensure the smooth progress of the resource negotiation process.

Step S306, the MHF module of the service access network sends a media independent handover candidate access network query confirmation primitive to the MIH user module of the service access network; If the media-independent handover candidate access network query response message carries the query resource information, the media-independent handover candidate access network query confirmation primitive should also carry the query resource information, otherwise the query resource information does not need to be carried.

In the prior art, the media-independent handover candidate access network confirms that the parameter of the query resource information is not defined in the primitive, and cannot carry the query resource information. Therefore, in this embodiment, the media-independent handover candidate access network needs to be queried. Confirm the parameters of the primitive definition query resource information to ensure the correct negotiation process.

Step S307: When receiving the media-independent handover candidate access network query confirmation primitive, the MIH user module of the service access network uses the query resource information carried in the service or the query resource information locally saved by the service access network to access the service through the service. The MHF module of the network requests the actual available resource information of the candidate access network to each candidate access network;

Step S308, the candidate access network returns the actual available resource information to the MIHF module of the service access network, and reports the actual available resource information to the MIH user module of the service access network through the MIHF module of the service access network for service access. The MIH User Module entering the network is used when making handover decisions.

Embodiment 4

In this embodiment, the handover is triggered by the network side, and the handover decision is made by the terminal.

In this embodiment, the process of triggering the handover from the serving access network to the serving access network to obtain the actual available resource information of the candidate access network is the same as that in the third embodiment. After the service access network obtains the actual available resource information of the candidate access network, the actual available resource information and the identifier of the actual available resource information corresponding to the candidate access network are sent to the MIH user module of the terminal for the terminal MH user. The module is used when making switching decisions.

In the foregoing embodiments, the query resource information and the actual available resource information carried in the primitive and the message may be in the form of a resource list or a link QoS (Quality of Service) indicator.

A terminal device in an embodiment of the present invention includes an MIH user module and an MIHF module, wherein: The MIH user module sends the query resource information to the MIHF module in the media independent handover;

The MIHF module sends the query resource information to the corresponding service access network.

The MIHF module can receive the query resource tag information sent by the service access network, and send the query resource tag information to the MIH user module, where the query resource tag information indicates whether the terminal device needs to provide the query resource information;

When the MIH user module determines that the query resource information needs to be provided according to the tag information, the MIH user module sends the query resource information to the service access network through the MIHF module.

The MIHF module can receive the actual available resource information sent by the service access network and the identification information of the candidate access network corresponding to the actual available resource information, and send the identifier information to the MIH user module.

An access network in an embodiment of the present invention includes an MIH subscriber module and a MIHF module, wherein:

The MIH user module requests and obtains actual available resource information of the candidate access network according to the query resource information.

The MIH user module may send the query resource tag information to the terminal device through the MIHF module, and query the resource tag information to indicate whether the terminal device needs to provide the query resource information.

After obtaining the actual available resource information, the MIH user module sends the actual available resource information and the identifier information of the candidate access network corresponding to the actual available resource information to the terminal device through the MIHF module.

The communication system in an embodiment of the present invention, as shown in FIG. 6, includes:

a terminal device, configured to send query resource information in media independent handover;

The access network is used to connect the terminal device to the network, where:

The candidate access network sends the actual available resource information to the service access network according to the request. In this embodiment, the media independent handover can be triggered by the service access network, and is set to the terminal. The query resource tag information is sent, and the query resource tag information indicates whether the terminal device needs to provide the query resource information;

The terminal device sends the query resource information when it is determined that the query resource information needs to be provided according to the tag information.

After obtaining the actual available resource information, the service access network may send the actual available resource information and the identifier information of the candidate available access network to the terminal device. The spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and variations of the invention as claimed.

Claims

Rights request

A method for performing resource negotiation, which is characterized by comprising:

The service access network receives the query resource information sent by the terminal device in the medium-independent handover; the service access network requests and obtains the actual available resources of the candidate access network according to the query resource information. information.

2. The method of claim 1 wherein the media terminal switch is triggered by the terminal device.

The method according to claim 1, wherein the media access-free handover is triggered by the service access network, and the query resource tag information is sent to the terminal device, where the query resource tag information indicates whether the terminal device is needed. Providing the query resource information;

And the terminal device sends the query resource information when determining that the query resource information needs to be provided according to the query resource tag information.

The method according to claim 1, wherein the query resource information and the actual available resource information are in the form of a resource list or a link service shield indicator.

The method according to any one of claims 1 to 4, wherein the media independent switching function MIHF module of the service access network receives the query resource information, and sends the query resource information to the The medium-independent switching MIH user module of the service access network.

The method according to any one of claims 1 to 4, wherein, after the service access network obtains the actual available resource information, the actual available resource information and the actual available resource information corresponding candidate The identification information of the access network is sent to the terminal device.

The method according to claim 6, wherein the H user module of the service access network obtains the actual available resource information, and then selects the actual available resource information and the actual available resource information. The identification information of the incoming network is sent to the MIHF module of the service access network.

The method according to claim 6, wherein the MIHF module of the terminal device receives the actual available resource information and the identifier of the candidate available access network corresponding to the actual available resource information. Information and sent to the MIH User Module of the terminal device.

A terminal device, comprising: a media independent switching MIH user module and a media independent switching function MIHF module, wherein:

The MH user module sends query resource information to the MIHF module in media independent handover;

The MIHF module sends the query resource information to a service access network.

The terminal device according to claim 9, wherein the MIHF module receives the query resource tag information sent by the service access network, and sends the query resource tag information to the MIH user module. The query resource tag information indicates whether the terminal device is required to provide the query resource information;

And the MIH user module sends the query resource information to the service access network by using the MIHF module, when determining, according to the tag information, that the query resource information needs to be provided.

The terminal device according to claim 9 or 10, wherein the MIHF module receives the actual available resource information sent by the service access network and the identifier information of the candidate access network corresponding to the actual available resource information, And sent to the MIH user module.

12. An access network, the access network comprising a media independent switching MIH user module and a media independent switching function MIHF module, wherein:

The access network according to claim 12, wherein the MIH user module sends the query resource tag information to the terminal device by using the HF module, and the query resource tag information indicates whether the The terminal device provides the query resource information.

The access network according to claim 12 or 13, wherein, after obtaining the actual available resource information, the MIH user module associates the actual available resource information with the actual available resource information Identification information of the network is sent to the terminal through the MIHF module Equipment.

15. A communication system, the system comprising:

Receiving, by the service access network corresponding to the terminal device, the query resource information, and sending a request for actual available resource information according to the query resource message;

The system according to claim 15, wherein the media access-free handover is triggered by the service access network, and a query resource indicating whether the terminal device is required to provide the query resource information is sent to the terminal device Marking information;

The system according to claim 15 or 16, wherein, after the service access network obtains the actual available resource information, the actual available resource information and the actual available resource information are corresponding to the candidate access network. The identification information is sent to the terminal device.