CN101345993B

CN101345993B - Heterogeneous network switch method and apparatus

Info

Publication number: CN101345993B
Application number: CN2007101363182A
Authority: CN
Inventors: 郭均祥; 夏斌; 刘菁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Changzhou Xiaoguo Information Service Co., Ltd.
Priority date: 2007-07-13
Filing date: 2007-07-13
Publication date: 2011-06-01
Anticipated expiration: 2027-07-13
Also published as: CN101345993A; WO2009009991A1

Abstract

The invention discloses a heterogeneous network switch method and apparatus thereof. The method in the invention comprises: the current service network of terminal acquires the corresponding coincidence relation information, which is stored in an information server without relation to media, of the service node and network access point of alternative network; the current service network of terminal inquires the network access point resource information of the alternative network to the alternative network respectively according to the coincidence relation; the current service network of terminal selects a target network access point according to the inquired resource information, and informs the terminal to switch to the target network access point; or, sends the inquired resource information to the terminal, the terminal selects target network access point according to the resource information and switch to the target network access point. By adopting the invention, network switch can be implemented in the condition that the service node separates from the network access point or one service node correspond to several network access points.

Description

Heterogeneous network switch method and device thereof

Technical field

The present invention relates to wireless communication field, relate in particular to the method that a kind of heterogeneous network switches, and terminal, the service node equipment of media-independent and the information server of media-independent.

Background technology

Under existing wireless communication technology condition, the mobile subscriber can't roam under different wireless access technologys and switch, in order to solve the roaming switching problem of mobile subscriber between IEEE 802.3/802.11/802.16/3GPP/3GPP2 system, 2003 the end of the year IEEE 802 wireless working groups set up IEEE 802 and switched seminar---Handoff ECSG, definite designation at present is IEEE 802.21 working groups, be responsible for working out public switching framework and be used for wired and wireless IEEE 802 standards (as IEEE 802.3, IEEE802.11 and IEEE802.16) and 3G standard, the requirement that standard is switched between various criterion and corresponding handover mechanism.

Along with the evolution of wireless communication technology, terminal and network may be multimodes all as base station, access point, that is to say to support different wireless standards, can carry out speech and transfer of data simultaneously sometimes on a plurality of interfaces.Present mobile communications network has developed to microcellulor (IEEE 802.11, and IEEE 802.15) and macrocellular (3GPP, 3GPP2, IEEE 802.16), may intersect covering between these honeycombs mutually, therefore, switch and network selecting just may take place between networks of different type.

The handoff solution of the media-independent among the IEEE 802.21 has disposed some handoff functionality collection and has formed a new protocol layer in the mobility management protocol stack of network element, be referred to as MIH (MediaIndependent Handover, the switching of media-independent) protocol layer.MIH layer protocol stack provides following service:

(1) MIH Event Service (MIH-ES): event classification, event filtering and event report about the dynamic change incident of link characteristics, Link State and link-quality are provided.

(2) MIH command service (MIH-CS): provide MIH user management and control the link behavior relevant with switching and mobility.

(3) MIH information service (MIH-IS): feature and professional details that service network and ambient network are provided.These information are used to carry out the efficient system access and switch decision.

The major function of MIH layer is exactly to provide handoff functionality with media-independent by Event Service, command service and information service.The purpose of MIH agreement formulation at present is the handoff functionality that is used for media-independent, the information service mechanism of MIH provides the unprecedented understanding means of neighbor networks details on every side, the MIH information service can allow terminal know the detailed features of its ambient network, the high-level business that can provide as network type, Virtual network operator, network provider, network, and information such as the QoS of access network (Quality of Service, service quality) feature, cost, data rate, safety, geographical position.That is to say, the more policy information of selecting network for the user is provided by MIH mechanism.

Among the existing IEEE 802.21, in order to use TLV (Type/Length/Value effectively, type) form is represented the information of neighbor networks in the isomerous environment, has defined three types container by level: neighbours' access network container list (List of Neighboring Access Networks Container), access network container (Access Network Container) and Network Access Point container (PoA Container).These three kinds of containers can comprise several access network containers by hierarchical classification as neighbours' access network container list, and the access network container can comprise plurality of network access point container.Table 1, table 2 and table 3 have provided the structural representation that above-mentioned three kinds of containers are stored respectively in MIIS Server (Media Independent Information Server, the information server of media-independent).

Table 1: neighbours' access network container list

Content	Explanation
		Access Network Container#1	The sign of access network container 1
Access Network Container#2	The sign of access network container 2
		……	……
Access Network Container#k	The sign of access network container k

Table 2: access network container

Content	Explanation
		Network Type IE	The information unit of storage networking type information
Operator Identifier IE	The information unit of storage operator sign
		Service Provider Identifier IE	The information unit of storage service provider sign
……	……
		PoA Container#1	The sign of Network Access Point container 1
PoA Container#2	The sign of Network Access Point container 2
		……	……
PoA Container#k	The sign of Network Access Point container k

Table 3: Network Access Point container

Content	Explanation
		PoA MAC address IE	The information unit of storage networking access point MAC Address
PoA Location IE	The information unit of storage networking access point position information

PoA Channel Range IE	The information unit of storage networking access point range of channels
		……	……
PoA IP Address IE#1	The information unit of storage networking access point IP address 1
		PoA IP Address IE#2	The information unit of storage networking access point IP address 2
……	……
		PoA IP Address IE#k	The information unit of storage networking access point IP address k

In the handoff procedure of prior art, the example that switches to the terminal initiation, MN (MobileNode during switching, mobile node) elder generation obtains the information of some Network Access Points (PoA Container) from MIIS Server, MN initiates query messages (MIH_MN_HO_Candidate_Query.request) to candidate network then, in this message, carry PoA (the Point of Attachment that will carry out resource query, Network Access Point) tabulation, the PoS of service network (Point of Service, service node) receive this message after, the resource inquiry information (MIH_N2N_Query_Resources.request) that sends network-to-network is given the PoS of candidate network, and the PoS of candidate network issues corresponding PoA with this message again and carries out resource query.Press the request message that original route responds MN after having inquired about resource.

The inventor finds that there is following shortcoming at least in prior art in realizing process of the present invention:

When PoS and PoA were a network entity, prior art can realize above-mentioned switching flow, still, when PoS separate with PoA or PoS under when a plurality of PoA is arranged, above-mentioned switching flow can't be realized.This be because, do not store PoS information on the MIIS Server, the PoS of MN or current service network can't obtain the identifier information of PoS from MIIS Server, therefore, switch to the process of PoA of objective network at PoA from the current service network, the PoS of service network can't obtain the relevant information of the PoS under the PoA of objective network, thereby the resource information that also just can't obtain target P oA by the PoS of objective network carries out the network selecting decision-making, also can't carry out interacting message by the PoS with objective network and switch to finish network.

Summary of the invention

Embodiments of the invention have disclosed a kind of heterogeneous network switch method, to realize that the current service network of terminal can be according to the correspondence relationship information of service node and Network Access Point, obtain the resource information of Network Access Point from the service node of candidate network, thereby realize that network switches.This heterogeneous network switch method comprises the steps:

The current service network of terminal obtains the service node of candidate network and the correspondence relationship information of Network Access Point; The correspondence relationship information of described service node and Network Access Point is stored in the information server of media-independent;

The described correspondence relationship information that the current service network basis of described terminal acquires, the resource information of inquiring about the Network Access Point of described candidate network respectively to the service node of described candidate network;

The Network Access Point resource information select target Network Access Point of the described candidate network that the current service network basis of described terminal inquires, and notify described terminal to switch to described objective network access point;

Perhaps, the Network Access Point resource information of the described candidate network that the current service network of described terminal will inquire sends to described terminal, and described terminal is according to described resource information select target Network Access Point, and switches to described objective network access point.

Embodiments of the invention have also disclosed a kind of terminal, and this terminal comprises:

The relation information acquisition module is used for obtaining from the information server of media-independent the correspondence relationship information of the service node and the Network Access Point of candidate network;

The resource information acquisition module is used for described correspondence relationship information is sent to the current service network of described terminal, and the resource information of request query candidate network of network access point; Receive the current service network of described terminal according to described correspondence relationship information, the resource information of the map network access point that inquires from the service node of described candidate network;

Network selection module is used for the Network Access Point resource information select target Network Access Point of the candidate network that gets access to according to described resource information acquisition module;

The network handover module is used for the objective network access point selected according to described network selection module, carries out the operation of switching to described objective network access point.

The access-in point information acquisition module is used for obtaining the candidate network access-in point information from the information server of media-independent;

The resource information acquisition module is used for described candidate network access-in point information is sent to the current service network of described terminal, and the resource information of the described candidate network access point of request inquiry; Receive the resource information of the described candidate network access point that the current service network of described terminal returns, described resource information be the current service network of described terminal according to the service node of the candidate network that gets access to from described information server and the correspondence relationship information of Network Access Point, the resource information of the candidate network access point that the candidate's service node by correspondence inquires from the candidate network access point;

Network selection module is used for the candidate network access point resource information select target Network Access Point that gets access to according to described resource information acquisition module;

Embodiments of the invention have also disclosed a kind of service node equipment of media-independent, and this equipment comprises: comprising: query requests processing module, candidate network enquiry module and hand-off process module;

Described query requests processing module is used for the candidate network query requests that receiving terminal sends, and wherein carries the service node of the candidate network that described terminal gets access to from the information server of media-independent and the correspondence relationship information of Network Access Point; Be used to receive the described candidate network that described candidate network enquiry module inquires Network Access Point resource information and send to described terminal;

Described candidate network enquiry module, be used for the described correspondence relationship information that gets access to according to described query requests processing module, inquire about the resource information of the Network Access Point corresponding respectively by the service node of described candidate network, and the described resource information that will inquire sends to described query requests processing module with described service node;

Described hand-off process module is used to receive described terminal and selects the network handoff request that sends behind the objective network access point according to the Network Access Point resource information of described candidate network, carries out the network handover operation.

Embodiments of the invention have also disclosed a kind of service node equipment of media-independent, and this equipment comprises: memory module, query requests processing module, candidate network enquiry module and hand-off process module;

Described memory module, the correspondence relationship information that is used for storage service node and Network Access Point, described correspondence relationship information is described service node equipment to the information server registration of media-independent the time, the service node that gets access to from described information server and the correspondence relationship information of Network Access Point;

Described query requests processing module is used for the candidate network query requests that receiving terminal sends, and wherein carries the candidate network access-in point information that described terminal gets access to from the information server of media-independent; Be used to receive the resource information of the described candidate network access point that described candidate network enquiry module inquires, and send to described terminal;

Described candidate network enquiry module, be used for described correspondence relationship information according to described candidate network access-in point information that gets access to from described query requests processing module and the storage of described memory module, the resource information of inquiring about described candidate network access point respectively by candidate's service node corresponding with described candidate network access point, and the described resource information that will inquire sends to described query requests processing module;

Described hand-off process module is used to receive described terminal and selects the network handoff request that sends behind the objective network access point according to described candidate network access point resource information, carries out the network handover operation.

Embodiments of the invention also provide a kind of service node equipment of media-independent, and this equipment comprises: corresponding relation acquisition module, candidate network enquiry module and hand-off process module;

Described corresponding relation acquisition module is used for obtaining from the information server of media-independent the correspondence relationship information of the service node and the Network Access Point of candidate network;

Described candidate network enquiry module is used for the described correspondence relationship information that basis gets access to from described corresponding relation acquisition module, the resource information of inquiring about the Network Access Point of described candidate network respectively by the service node of described candidate network;

Described hand-off process module, the Network Access Point resource information that is used for the described candidate network that inquires according to described candidate network enquiry module is selected the objective network access point, and the notice terminal is switched to described objective network access point.

Embodiments of the invention have also disclosed a kind of information server of media-independent, and this information server comprises:

Memory module is used to store neighbours' access network container list, access network container and Network Access Point container; Store the service node identification information of the media-independent corresponding in described neighbours' access network container list or the described access network container with described access network container;

Enquiry module is used for the query requests that receiving terminal or service node equipment send, and described query requests is carried candidate network information; Described enquiry module is according to described candidate network information, the correspondence relationship information of inquiring about the service node and the Network Access Point of described candidate network from described memory module, and described correspondence relationship information turned back to described terminal or the service node equipment that sends query requests.

The above embodiment of the present invention, corresponding relation by storage service node and Network Access Point in the information server of media-independent, make the current service network of terminal can get access to this corresponding relation, and when network switches, can be according to the resource information of this corresponding relation by the Service Access point of the service node query candidate network of candidate network, as the foundation of select target Network Access Point, thereby realize that network switches.Especially under service node and situation that Network Access Point separates, or under the situation of the corresponding a plurality of Network Access Points of service node, can realize that network switches.

Description of drawings

Fig. 1 is the schematic flow sheet of the embodiment of the invention one;

Fig. 2 is the schematic flow sheet of the embodiment of the invention two;

Fig. 3 is the schematic flow sheet of the embodiment of the invention three;

Fig. 4 is the schematic flow sheet of the embodiment of the invention four;

The terminal structure schematic diagram that Fig. 5 A and Fig. 5 B provide for the embodiment of the invention;

The service node device structure schematic diagram of the media-independent that Fig. 6 A, Fig. 6 B and Fig. 6 C provide for the embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.

For PoS information and the corresponding PoA information that candidate network can be provided to the PoS of terminal or service network, the embodiment of the invention has been stored the correspondence relationship information of the PoA of the PoS of each candidate network and this network in the MIIS server, when making terminal carry out the network switching, can pass through the PoA resource information of the PoS query candidate network of candidate network, switch selection to carry out network, and finally switch to objective network.Especially physically separate with PoA or during the corresponding a plurality of PoA of PoS, make terminal can finish network and switch at PoS.

In the embodiment of the invention, by the information unit of increase storage service node identifier in the associated vessel on the MIIS server, the correspondence relationship information of the PoS of each candidate network of realization storage and the PoA of this network, specific implementation can have two kinds:

Mode one

Increase an information unit in the Access Network container on the MIIS server, this information unit is used for store M IHF (Media Independent Handover Function, the handoff functionality of media-independent) identifier of entity (MIH PoS Identifier), the MIH PoS node that following PoA communicates in MIH PoS Identifier sign and the access network.The information unit of this store M IH PoS Identifier is a byte or multibyte character string, MIH PoS Identifier of storage in this information unit.Table 4 has provided the signal that increases the information unit that is used for store M IH PoS Identifier in the access network container.

Table 4

Content	Explanation
		MIH PoS Identifier IE	The information unit of store M IH PoS node identifier, be used to identify the MIHF functional entity, by one or more eight character strings that hyte is formed, this identifier is changeless, can be NAI (Network Access Identifier, network access identifier) or FQDN (Fully Qualified DomainName, universe name) form.
Network Type IE	The information unit of storage networking type information
		Operator Identifier IE	The information unit of storage operator sign
Service Provider Identifier IE	The information unit of storage service provider sign

PoA Container#1	The sign of Network Access Point container 1
		PoA Container#2	The sign of Network Access Point container 2

		PoA Container#k	The sign of Network Access Point container k

Mode two

In neighbours' access network container list, increase one or more information units, the information unit that increases is used for storing the MIH PoS Identifier corresponding with the access network container of neighbours' access network container list, in the information unit that increases, MIH PoS Identifier of each information unit storage, each information unit can corresponding one or more access network containers.Table 5 has provided the signal that increases the information unit that is used for store M IH PoS Identifier in neighbours' access network container list.

Table 5

Content	Explanation
		MIH PoS Identifier IE#1	The information unit 1 of storage PoS node identifier, MIH PoS Identifier correspondence (administration) the access network container of storing in this information unit 1
Access Network Container#1	The sign of access network container 1
		MIH PoS Identifier IE#2	The information unit 2 of storage PoS node identifier, MIH PoS Identifier correspondence (administration) the access network container of storing in this information unit 2,3 and 4
Access Network Container#2	The sign of access network container 2
		Access Network Container#3	The sign of access network container 3
Access Network Container#4	The sign of access network container 4
		……	……
MIH PoS Identifier IE#j	The information unit j of storage PoS node identifier
		Access Network Container#k	The sign of access network container k

No matter adopt above-mentioned which kind of mode store M IH PoS Identifier, can both embody the corresponding relation of PoA and PoS.

Embodiment one

The network switching flow that present embodiment is initiated with terminal is an example, described terminal and obtained the PoS of candidate network and the corresponding relation of corresponding PoA with it from the MIIS server, when terminal is initiated to switch, the correspondence relationship information of the PoS of candidate network and corresponding with it PoA is issued the PoS (service PoS) of service network, service PoS sends resource inquiry information to the PoS of candidate network respectively according to this corresponding relation, the list information that wherein comprises the PoA under the PoS of each candidate network respectively, and the resource information that inquires sent to terminal, terminal is select target PoA in view of the above, and switches to the process of objective network.

Referring to Fig. 1, be the schematic flow sheet of the embodiment of the invention one.In the present embodiment, terminal is found candidate network 1 and network 2 at network discovery phase, and terminal is carried out the process that network switches from these candidate network select target networks, specifically comprises step:

Step 101, terminal send obtains informational message (MIH_Get_Information Request) to the MIIS server, the information of acquisition request candidate network 1 and network 2, the information of network 1 and network 2 comprises a lot, can filter inquiry as required, for example can comprise information such as network type, network operation merchant, service provider, network security.

Step 102, MIIS server return corresponding response message (MIH_Get_Information Response) according to this message to terminal, carry the relevant information of access network 1 and network 2 in the response message, comprise: the service node PoS-C1 in the access network 1 and the Network Access Point PoA-C11 of communication (correspondence) with it, the relevant information of PoA-C12, the Network Access Point PoA-C21 of service node PoS-C2 in the access network 2 and communication (correspondence) with it, the relevant information of PoA-C22, and the Query Information of customization.

The MIIS server provide to terminal candidate network relevant information process can for:

Mode one

The MIIS server is stored the PoS identifier corresponding with this access network by MIH PoS Identifier information unit in the access network container, as shown in table 4.In the present embodiment, in the access network container of access network 1, MIH PoS Identifier information unit has been stored the identifier of the service node PoS-C1 of access network 1, and PoS-C1 can communicate with all PoA (as PoA-C11 and PoA-C12) in the access network 1; In the access network container of access network 2, MIH PoS Identifier information unit has been stored the identifier of the service node PoS-C2 of access network 2, and PoS-C2 can communicate with all PoA (as PoA-C21 and PoA-C22) in the access network 2.

In this case, the MIIS server obtains the request-related information of access network 1 and access network 2 according to terminal, respectively from the access network container of access network 1 and access network 2, get access to the identifier of PoS-C1 and corresponding with it PoA-C11, the container identification of PoA-C12, get access to the identifier of PoS-C2 and corresponding with it PoA-C21, the container identification of PoA-C22; From corresponding PoA container, obtain the specifying information such as MAC Address, position, range of channels of each PoA.The MIIS server is with the identifier of the PoS-C1 that gets access to and corresponding with it PoA-C11, the specifying information of PoA-C12, the identifier of PoS-C2 and corresponding with it PoA-C21, the specifying information of PoA-C22, (MIH_Get_Information Response) sends to this terminal by response message.

Mode two

The corresponding PoS identifier of each access network MIIS server passes through one or more MIH PoSIdentifier information unit storage and tabulates in neighbours' access network container list in, as shown in table 5.In the present embodiment, store the identifier of service node PoS-C1 in the MIH PoS Identifier information unit 1, corresponding to access network 1; Store the identifier of service node PoS-C2 in the MIH PoS Identifier information unit 2, corresponding access network 2.PoS-C1 can communicate with all PoA in the access network 1, and PoS-C2 can communicate with all PoA in the access network 2.

In this case, the MIIS server obtains the request-related information of access network 1 and access network 2 according to terminal, from neighbours' access network container list, obtain the identifier with the corresponding PoS-C1 of access network 1 in the MIH PoSIdentifier information unit 1 corresponding, from the MIH PoS Identifier information unit 2 corresponding, obtain identifier with the corresponding PoS-C2 of access network 2 with access network container 2 with access network container 1.The MIIS server gets access to the PoA container identification in each access network respectively from the access network container of access network 1 and access network 2, obtain the specifying information such as MAC Address, position, range of channels of each PoA from corresponding PoA container (PoA-C11, PoA-C12, PoA-C21, PoA-C22 container).The MIIS server is with the identifier of the PoS-C1 that gets access to and corresponding with it PoA-C11, the specifying information of PoA-C12, the identifier of PoS-C2 and corresponding with it PoA-C21, the specifying information of PoA-C22, (MIH_Get_Information Response) sends to this terminal by response message.

As can be seen, no matter adopt which kind of mode, the MIIS server can send to terminal with the PoS of candidate network and the correspondence relationship information of PoA, make terminal initiate query requests to the PoS of candidate network, obtain the resource information of the PoA in this network by the PoS of candidate network, so that carry out network selecting.

After step 103, terminal are received the response message that the MIIS server returns, send the service node PoS-S of handoff candidate network inquiry message (MIH_MN_HO_Candidate_Query Request) to the current service network, comprise the PoA tabulation (information such as address that comprise PoA-C11 and PoA-C12 in the tabulation) of PoS-C1 identifier and communication (correspondence) with it in this message, the PoA tabulation (information such as address that comprise PoA-C21 and PoA-C22 in the tabulation) of PoS-C2 identifier and communication (correspondence) with it.

After the PoS-S of step 104a and step 104b, current service network receives query messages, send the switching query resource message (MIH_N2N_HO_Query_Resources Request) of network-to-networks respectively to candidate network 1 and network 2, the resource information of each PoA in request inquiry access network 1 and the network 2 is selected so that carry out objective network.

PoS-S sends to query messages PoS-C1 and PoS-C2 respectively, send to and carry PoS-C1 identifier and corresponding with it PoA tabulation in the query messages of PoS-C1, send in the query messages of PoS-C2 of access network 2 and carry PoS-C2 identifier and corresponding with it PoA tabulation.

After PoS-C1 receives query messages,, utilize the specific message of medium PoA-C11 and the PoA-C12 query resource information in the PoA tabulation respectively according to PoA tabulation wherein; After PoS-C2 receives query messages,, utilize the specific message of medium PoA-C21 and the PoA-C22 query resource information in the PoA tabulation respectively according to PoA tabulation wherein.

Step 105a and step 105b, candidate network 1 and network 2 return switching query resource response (MIH_N2N_HO_Query_ResourcesResponse) message of network-to-network, the resource information of wherein carrying the PoA that inquires respectively to the PoS-S of service network.

The PoS-S of step 106, service network sends handoff candidate network inquiry response (MIH_MN_HO_Condidate_Query Respose) message, the resource information of wherein carrying the PoA in access network 1 and the access network 2 to terminal.

Terminal is carried out network selecting according to the resource information of the PoA in access network 1 and the access network 2.In the present embodiment, terminal selects the PoA-C12 of access network 1 as the objective network access point.

After step 107, terminal are determined objective network, send handover execution command (MIH_MN_HO_Commit), show to switch to access network 1 to the PoS-S of service network.

The PoS-S of step 108, service network sends the handover execution command (MIH_N2N_HO_Commit) of network-to-network to the PoS-C1 of candidate network 1.

The PoS-C1 of step 109～110, access network 1 returns corresponding response message (MIH_N2N_HO_Commit) to the PoS-S of service network, and PoS-S returns corresponding response message (MIH_MN_HO_Commit) to terminal.

Step 111, high-rise (layer 3 and more than) are carried out handoff procedure.

Step 112～115, terminal and network are carried out and are switched complete process, comprise that terminal sends network-to-network handoff completion message (MIH_N2N_HO_Complete) to the PoS-C1 of access network 1, PoS-C1 sends network-to-network handoff completion message (MIH_N2N_HO_Complete) to PoS-S; PoS-S returns respective response message to PoS-C1, and PoS-C1 returns respective response message to terminal.

Embodiment two

The network switching flow that present embodiment is initiated with terminal is an example, the PoS that has described each access network obtains the PoS of ambient network and topological relation and the preservation of corresponding PoA with it by registration process from the MIIS server, when terminal is initiated the network switching, the PoA tabulation of candidate network is sent to service PoS, service PoS receives and switch to initiate after the message according to PoS that preserves and the topological relation of PoA, send resource inquiry information to corresponding candidate PoS respectively, the list information that wherein comprises the PoA under each candidate PoS respectively, and the resource information that inquires sent to terminal, terminal is the select target network in view of the above, and switches to the process of objective network.

Referring to Fig. 2, be the schematic flow sheet of the embodiment of the invention two.In the present embodiment, terminal is found candidate network 1 and access network 2 at network discovery phase, and terminal is carried out the process that network switches from these candidate network select target networks, specifically comprises step:

Step 201, terminal send obtains informational message (MIH_Get_Information Request) to MIIS server, the information of acquisition request candidate network 1 and network 2.

Step 202, MIIS server return corresponding response message (MIH_Get_Information Response) according to this message to terminal, carry the relevant information of access network 1 and network 2 in the response message, comprise: the Network Access Point PoA-C11 in the access network 1, the information such as address of PoA-C12, the Network Access Point PoA-C21 in the access network 2, the information such as address of PoA-C22.

Step 203～204, service network send MIH registration message (MIH_RegisterRequest) to the MIIS server, and the back MIIS server that succeeds in registration returns the topology information of service network ambient network by MIH registration reply message (MIH_RegisterResponse).

All PoS will arrive the registration of MIIS server place when each startup (Power On).Therefore, step 203～204 and step 201 do not have the requirement on the sequential.

In the present embodiment, network packet includes network 1 and network 2 around the service network, comprise the identifier of service node PoS-C1 of network 1 and the PoA tabulation (information such as MAC Address that comprise PoA-C11 and PoA-C12 in the tabulation) of communication (correspondence) with it in the MIH registration reply message, the PoA tabulation (information such as MAC Address that comprise PoA-C21 and PoA-C22 in the tabulation) of the identifier of the service node PoS-C2 of network 2 and communication (correspondence) with it, the PoS-S of service network preserves the topology information of these ambient network get off.

The MIIS server to PoS provide access network on every side (network packet includes network 1 and network 2 in the present embodiment around the service network) relevant information process can for:

Mode one

In this case, the MIIS server is according to the registration message of PoS-S, respectively from the access network container of access network 1 and access network 2, get access to the identifier of PoS-C1 and corresponding with it PoA-C11, the container identification of PoA-C12, get access to the identifier of PoS-C2 and corresponding with it PoA-C21, the container identification of PoA-C22; From corresponding PoA container, obtain the specifying information such as MAC Address, position, range of channels of each PoA.The MIIS server is with the identifier of the PoS-C1 that gets access to and corresponding with it PoA-C11, the specifying information of PoA-C12, and the identifier of PoS-C2 and corresponding with it PoA-C21, the specifying information of PoA-C22 send to PoS-S by registration reply message.

Mode two

The MIIS server in neighbours' access network container list by the storage of one or more MIH PoSIdentifier information units with tabulate in the corresponding PoS identifier of each access network, as shown in table 5.In the present embodiment, store the identifier of service node PoS-C1 in the MIH PoS Identifier information unit 1, corresponding to access network 1; Store the identifier of service node PoS-C2 in the MIH PoS Identifier information unit 2, corresponding access network 2.PoS-C1 can communicate with all PoA in the access network 1, and PoS-C2 can communicate with all PoA in the access network 2.

In this case, the MIIS server is according to the registration message of PoS-S, from neighbours' access network container list, obtain the identifier with the corresponding PoS-C1 of access network 1 in the MIH PoS Identifier information unit 1 corresponding, from the MIH PoS Identifier information unit 2 corresponding, obtain identifier with the corresponding PoS-C2 of access network 2 with access network container 2 with access network container 1.The MIIS server gets access to the PoA container identification in each access network respectively from the access network container of access network 1 and access network 2, obtain the specifying information such as MAC Address, position, range of channels of each PoA from corresponding PoA container (PoA-C11, PoA-C12, PoA-C21, PoA-C22 container).The MIIS server is with the identifier of the PoS-C1 that gets access to and corresponding with it PoA-C11, the specifying information of PoA-C12, and the identifier of PoS-C2 and corresponding with it PoA-C21, the specifying information of PoA-C22 send to PoS-S by registration reply message.

As can be seen, no matter adopt which kind of mode, the MIIS server can send to terminal with the PoS of service network ambient network and the correspondence relationship information of PoA.

Step 205, terminal send the service node PoS-S of handoff candidate network inquiry (MIH_MN_HO_Candidate_QueryRequest) message to the current service network, comprise the tabulation of candidate network access point in the message, comprise Network Access Point PoA-C11, the PoA-C12 that obtains by step 202, the information of PoA-C21, PoA-C22 in the tabulation.

Step 206a and step 206b, after the PoS-S of service network receives query messages, the topology information of the ambient network of obtaining and preserving according to step 203～204, draw with PoA-C11 and PoA-C12 corresponding service node be PoS-C1, with PoA-C21 and PoA-C22 corresponding service node be PoS-C2, and respectively according to the identifier of PoS-C1 and the identifier of PoS-C2, send switching query resource (MIH_N2N_HO_Query_Resources Request) message of network-to-network to the PoS-C2 of the PoS-C1 of candidate network 1 and network 2, the resource information of each PoA in request inquiry access network 1 and the network 2 is selected so that carry out objective network.

PoS-S carries PoS-C1 identifier and corresponding with it PoA tabulation in sending to the query messages of PoS-C1, send in the query messages of PoS-C2 of access network 2 and carry PoS-C2 identifier and corresponding with it PoA tabulation.

After PoS-C1 receives query messages,, utilize PoA-C11 and the PoA-C12 query resource information of the specific message of medium in the PoA tabulation according to PoA tabulation wherein; After PoS-C2 receives query messages,, utilize PoA-C21 and the PoA-C22 query resource information of the specific message of medium in the PoA tabulation according to PoA tabulation wherein.

Step 207a and step 207b, candidate network 1 and network 2 return switching query resource response (MIH_N2N_HO_Query_Resources Response) message of network-to-network, the resource information of wherein carrying the PoA that inquires respectively to PoS-S.

The PoS-S of step 208, service network sends handoff candidate network inquiry response (MIH_MN_HO_Condidate_Query Respose) message, the resource information of wherein carrying the PoA in access network 1 and the access network 2 to terminal.

After step 209, terminal are determined objective network, send handover execution command (MIH_MN_HO_Commit), show to switch to access network 1 to the PoS-S of service network.

The PoS-S of step 210, service network sends the handover execution command (MIH_N2N_HO_Commit) of network-to-network to the PoS-C1 of candidate network 1.

The PoS-C1 of step 211～212, access network 1 returns corresponding response message (MIH_N2N_HO_Commit) to the PoS-S of service network, and PoS-S returns corresponding response message (MIH_MN_HO_Commit) to terminal.

Step 213, high-rise (layer 3 and more than) are carried out handoff procedure.

Step 214～217, terminal and network are carried out and are switched complete process, comprise that terminal sends network-to-network handoff completion message (MIH_N2N_HO_Complete) to the PoS-C1 of access network 1, PoS-C1 sends network-to-network handoff completion message (MIH_N2N_HO_Complete) to PoS-S; PoS-S returns respective response message to PoS-C1, and PoS-C1 returns respective response message to terminal.

Embodiment three

The network switching flow that present embodiment is initiated with network side is an example, described the current service network of terminal and obtained the PoS of candidate network and the corresponding relation of PoA from the MIIS server, when initiating to switch, correspondence relationship information according to the PoS and the PoA of the candidate network that gets access to, PoS to candidate network sends resource inquiry information respectively, the corresponding PoA resource information of request inquiry is carried out the process that network switches according to the PoA resource information select target network notice terminal that inquires.

Referring to Fig. 3, be the schematic flow sheet of the embodiment of the invention three.In the present embodiment, service network is found candidate network 1 and network 2 at network discovery phase, and service network carries out the process that network switches from these candidate network select target network notice terminals, and concrete steps comprise:

The service node PoS-S of the service network that step 301, terminal are current sends and obtains informational message (MIH_Get_Information Request) to MIIS server, the information of acquisition request candidate network 1 and network 2.

Step 302, MIIS server return corresponding response message (MIH_Get_Information Response) according to this message to PoS-S, carry the relevant information of network 1 and network 2 in the response message, comprise: service node PoS-C1 in the network 1 and corresponding with it Network Access Point PoA-C11, the relevant information of PoA-C12, service node PoS-C2 in the access network 2 and corresponding with it Network Access Point PoA-C21, the relevant information of PoA-C22.

The MIIS server provides the process and the respective process among the embodiment one of relevant information of candidate network similar to PoS-S, also can comprise dual mode, does not repeat them here.

After step 303, PoS-S receive the response message that the MIIS server returns, send handoff candidate network inquiry message (MIH_MN_HO_Candidate_Query Request) to terminal, comprise PoS-C1 identifier and corresponding with it PoA tabulation (information such as address that comprise PoA-C11 and PoA-C12 in the tabulation) in this message, PoS-C2 identifier and corresponding with it PoA tabulation (information such as address that comprise PoA-C21 and PoA-C22 in the tabulation).

Step 304, terminal are returned corresponding response message (MIH_MN_HO_Candidate_Query Response) to PoS-S.

Step 305a and step 305b, PoS-S send the switching query resource message (MIH_N2N_HO_Query_Resources Request) of network-to-networks respectively to candidate network 1 and network 2, the resource information of each PoA in request inquiry access network 1 and the network 2 is selected so that carry out objective network.

Step 306a and step 306b, candidate network 1 and network 2 return switching query resource response (MIH_N2N_HO_Query_ResourcesResponse) message of network-to-network, the resource information of wherein carrying the PoA that inquires respectively to the PoS-S of service network.

PoS-S carries out network selecting according to the resource information of the PoA in access network 1 and the access network 2.In the present embodiment, PoS-S selects the PoA-C12 of access network 1 as the objective network access point.

After step 307, PoS-S determine objective network, send handover execution command (MIH_N2N_HO_Commit), show terminal to be switched to access network 1 to the PoS-C1 of access network 1.

The PoS-C1 of step 308, access network 1 returns corresponding response message (MIH_N2N_HO_Commit) to the PoS-S of service network, shows and accepts handoff request.

Step 309～310, PoS-S send handover execution command (MIH_NET_HO_Commit) to terminal, and indicating terminal switches to access network 1, and terminal is returned corresponding response message (MIH_NET_HO_Commit) to the PoS-S of service network.

Step 311, high-rise (layer 3 and more than) are carried out handoff procedure.

Step 312～315, terminal and network are carried out and are switched complete process, comprise that terminal sends network-to-network handoff completion message (MIH_N2N_HO_Complete) to the PoS-C1 of access network 1, PoS-C1 sends network-to-network handoff completion message (MIH_N2N_HO_Complete) to PoS-S; PoS-S returns respective response message to PoS-C1, and PoS-C1 returns respective response message to terminal.

Embodiment four

The network switching flow that present embodiment is initiated with network side is an example, the current service network of terminal has been described when initiating to switch, according to PoS that gets access to from MIIS in advance and the correspondence relationship information of PoA, obtain the correspondence relationship information of the PoS and the PoA of candidate network, PoS to candidate network sends resource inquiry information respectively, the corresponding PoA resource information of request inquiry is carried out the process that network switches according to the PoA resource information select target network notice terminal that inquires.

Referring to Fig. 4, be the schematic flow sheet of the embodiment of the invention four, concrete steps comprise:

The service node PoS-S of step 401～402, service network sends MIH registration message (MIH_Register Request) to the MIIS server, and the back MIIS server that succeeds in registration returns the topology information of service network ambient network by MIH registration reply message (MIH_Register Response).

All PoS can be to the registration of MIIS server place when each startup (Power On).

In the present embodiment, network packet includes network 1 and network 2 around the service network, comprise identifier and the corresponding with it PoA tabulation (information such as MAC Address that comprise PoA-C11 and PoA-C12 in the tabulation) of the service node PoS-C1 of network 1 in the MIH registration reply message, the identifier of the service node PoS-C2 of network 2 and corresponding with it PoA tabulation (information such as MAC Address that comprise PoA-C21 and PoA-C22 in the tabulation), the PoS-S of service network preserves the topology information of these ambient network get off.

The MIIS server provides the process and the respective process among the embodiment one of relevant information of ambient network similar to PoS-S, also can comprise dual mode, does not repeat them here.

Step 403～415, the PoS-S of service network finds candidate network 1 and network 2 at network discovery phase, PoS that obtains from the WIIS server according to when registration and the corresponding relation of PoA, obtain identifier and the corresponding PoA-C12 of the service node PoS-C1 of network 1, the information of PoA-C12, the identifier of the service node PoS-C2 of network 2 and corresponding PoA-C22, the information of PoA-C22, and respectively to PoS-C1 and the corresponding PoA resource information of PoS-C2 request inquiry, carry out objective network according to the PoA resource information that inquires and select, and the notice terminal is carried out the network switching.Step 303 among this flow process and Fig. 3～315 are similar, do not repeat them here.

The embodiment of the invention also provides the terminal structure that is applied to above-mentioned flow process, the service node device structure of media-independent, and the information server structure of media-independent.

Referring to the terminal structure schematic diagram that Fig. 5 A provides for the embodiment of the invention, can initiate one described network switching flow as embodiment by this terminal.This terminal comprises: relation information acquisition module, resource information acquisition module and network selection module.

The relation information acquisition module is used for obtaining from the MIIS server correspondence relationship information of the service node and the Network Access Point of candidate network.Comprise in the relation information acquisition module:

Message sends submodule, is used for sending MIH_GET_Information message to the MIIS server, carries the information of candidate network in the message;

The message sink submodule is used to receive the MIH_GET_Information response message that the MIIS server returns, and carries the service node identifier and the corresponding information such as Network Access Point MAC Address of candidate network in the message.

The resource information acquisition module is used for the correspondence relationship information that the relation information acquisition module gets access to is sent to the current service network of this terminal, and the resource information of request query candidate network of network access point; Receive the current service network of this terminal according to above-mentioned correspondence relationship information, the resource information of the map network access point that inquires from the service node of candidate network.Comprise in the resource information acquisition module:

Message sends submodule, is used for sending MIH_MN_HO_Condidate_Query message to the service node of the current service network of this terminal, carries the service node identifier and the corresponding information such as Network Access Point MAC Address of candidate network;

The message sink submodule, be used to receive the MIH_MN_HO_Condidate_Query response message that the service node of the current service network of this terminal returns, the service node that carries the current service network of this terminal is according to above-mentioned corresponding relation, the resource information of the map network access point that inquires from the service node of candidate network.

Network selection module is used for the Network Access Point resource information select target Network Access Point of the candidate network that gets access to according to the resource information acquisition module;

The network handover module is used for the objective network access point selected according to network selection module, carries out the operation of switching to this objective network access point.

Referring to Fig. 5 B,, can initiate two described network switching flows as embodiment by this terminal for the another kind of terminal structure schematic diagram that the embodiment of the invention provides.This terminal comprises: access-in point information acquisition module, resource information acquisition module and network selection module.

The access-in point information acquisition module is used for obtaining the candidate network access-in point information from the MIIS server.Comprise in the access-in point information acquisition module:

Message sends submodule, is used for sending MIH_GET_Information message to the MIIS server, carries the information of candidate network;

The message sink submodule is used to receive the MIH_GET_Information response message that the MIIS server returns, and carries the network insertion dot information of candidate network in the message.

The resource information acquisition module is used for the candidate network access-in point information is sent to the current service network of this terminal, and the resource information of request query candidate Network Access Point; Receive the resource information of the candidate network access point that the current service network of this terminal returns, this resource information for the current service network of this terminal according to the service node that gets access to from the MIIS server and the correspondence relationship information of Network Access Point, the resource information of the candidate network access point that the candidate's service node by correspondence inquires from the candidate network access point.Comprise in the resource information acquisition module:

Message sends submodule, is used for sending MIH_MN_HO_Condidate_Query message to the service node of the current service network of this terminal, carries the candidate network access-in point information;

The message sink submodule is used to receive the MIH_MN_HO_Condidate_Query response message that the service node of the current service network of this terminal returns, the resource information of carrying the candidate network access point that inquires.

Network selection module is used for the candidate network access point resource information select target Network Access Point that gets access to according to the resource information acquisition module;

Referring to Fig. 6 A, the service node device structure schematic diagram of the media-independent that provides for the embodiment of the invention, this service node equipment can be applicable to embodiment one described network switching flow, and this service node equipment comprises: query requests processing module, candidate network enquiry module and hand-off process module.

The query requests processing module is used for the candidate network query requests that receiving terminal sends, and wherein carries the service node of the candidate network that this terminal gets access to from the MIIS server and the correspondence relationship information of Network Access Point; Be used to receive the candidate network that the candidate network enquiry module inquires Network Access Point resource information and send to this terminal;

The candidate network enquiry module, be used for the above-mentioned correspondence relationship information that gets access to according to the query requests processing module, inquire about the resource information of the Network Access Point corresponding respectively by the service node of candidate network, and the resource information that inquires is sent to the query requests processing module with this service node;

The hand-off process module is used for receiving terminal and selects the network handoff request that sends behind the objective network access point according to the Network Access Point resource information of candidate network, carries out the network handover operation.

Referring to Fig. 6 B, the service node device structure schematic diagram of the another kind of media-independent that provides for the embodiment of the invention, this service node equipment can be applicable to embodiment two described network switching flows, and this service node equipment comprises: memory module, query requests processing module, candidate network enquiry module and hand-off process module.

Memory module, the correspondence relationship information that is used for storage service node and Network Access Point, this correspondence relationship information be this service node equipment to the MIIS server registration time, the service node that gets access to from this MIIS server and the correspondence relationship information of Network Access Point;

The query requests processing module is used for the candidate network query requests that receiving terminal sends, and wherein carries the candidate network access-in point information that this terminal gets access to from the MIIS server; Be used to receive the resource information of the candidate network access point that the candidate network enquiry module inquires, and send to this terminal;

The candidate network enquiry module, be used for candidate network access-in point information and memory module stored relation information that basis gets access to from the query requests processing module, resource information by the candidate service node query candidate Network Access Point corresponding respectively with the candidate network access point, and the resource information that inquires sent to the query requests processing module;

The hand-off process module is used to receive this terminal and selects the network handoff request that sends behind the objective network access point according to candidate network access point resource information, carries out the network handover operation.

Referring to Fig. 6 C, the service node device structure schematic diagram of the another kind of media-independent that provides for the embodiment of the invention, this service node equipment can be applicable to embodiment three or four described network switching flows, and this service node equipment comprises: corresponding relation acquisition module, candidate network enquiry module and hand-off process module.

The corresponding relation acquisition module is used for obtaining from the MIIS server correspondence relationship information of the service node and the Network Access Point of candidate network;

The candidate network enquiry module is used for the correspondence relationship information that basis gets access to from the corresponding relation acquisition module, passes through the resource information of the service node query candidate network of network access point of candidate network respectively;

The hand-off process module, the Network Access Point resource information that is used for the candidate network that inquires according to the candidate network enquiry module is selected the objective network access point, and the notice terminal is switched to this objective network access point.

The embodiment of the invention also provides a kind of MIIS server, and this server comprises: memory module and enquiry module.

Memory module is used to store neighbours' access network container list, access network container and Network Access Point container; Wherein, store the service node identification information of the media-independent corresponding in neighbours' access network container list or the access network container with the access network container.

When neighbours' access network container list in memory module of the service node identification information storage of media-independent, neighbours' access network container list comprises one or more information units, be used to store the service node identification information of these media-independents, each information unit is corresponding with access network container in one or more neighbours' access network container list.

When access network container in memory module of the service node identification information storage of media-independent, comprise an information unit in the access network container, be used to store the service node identification information of the media-independent corresponding with this access network container.

Enquiry module is used for the query requests that receiving terminal or service node equipment send, and this query requests is carried candidate network information; Enquiry module is according to candidate network information, from the service node of memory module query candidate network and the correspondence relationship information of Network Access Point, and this correspondence relationship information turned back to terminal or the service node equipment that sends query requests.

In sum, in the embodiments of the invention, the corresponding relation of storage PoS and PoA in the MIIS server, in the network switching flow that terminal is initiated, obtain the PoS that stores among the MIIS and the correspondence relationship information of PoA by terminal, and offer the current service network of this terminal, or obtain the correspondence relationship information of PoS and PoA when the registration by the current service network of this terminal, thereby make the current service network of terminal can be according to the resource information of the Service Access point of the service node query candidate network of this corresponding relation by candidate network, offer the foundation of terminal, realize that network switches as the select target Network Access Point.In the network switching flow that network side is initiated, obtain the PoS that stores among the MIIS and the correspondence relationship information of PoA by the current service network of terminal, according to the resource information of this corresponding relation by the Service Access point of the service node query candidate network of candidate network, and according to the service node resource information select target Network Access Point that inquires, thereby realize that network switches.Especially under service node and situation that Network Access Point separates, or under the situation of the corresponding a plurality of Network Access Points of service node, can realize that by the embodiment of the invention network switches.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. a heterogeneous network switch method is characterized in that, comprises the steps:

2. heterogeneous network switch method as claimed in claim 1 is characterized in that, the current service network of described terminal obtains the service node of candidate network and the correspondence relationship information of Network Access Point, comprising:

Described terminal is obtained the correspondence relationship information of the service node and the Network Access Point of candidate network from the information server of media-independent, and sends to the current service network of described terminal.

3. heterogeneous network switch method as claimed in claim 2, it is characterized in that, the service node of the described candidate network that described terminal will get access to from described information server and the correspondence relationship information of Network Access Point send to the current service network of described terminal, may further comprise the steps A:

A, described terminal send handoff candidate network inquiry message, the correspondence relationship information of carrying the service node and the Network Access Point of described candidate network to the service node of the current service network of described terminal;

The current service network of described terminal is according to the described correspondence relationship information that acquires, and the resource information of inquiring about the Network Access Point of described candidate network to the service node of described candidate network may further comprise the steps B respectively:

The service node of the service network that B, described terminal are current is according to the described correspondence relationship information that acquires, respectively after the service node of described candidate network inquires the resource information of Network Access Point of described candidate network, send handoff candidate network inquiry response message to described terminal, carry the Network Access Point resource information of the described candidate network that inquires.

4. heterogeneous network switch method as claimed in claim 1 is characterized in that, the current service network of described terminal obtains the service node of candidate network and the correspondence relationship information of Network Access Point, comprising:

Described terminal is obtained the candidate network access-in point information from the information server of media-independent, and sends to the current service network of described terminal;

The current service network of described terminal obtains the service node of described candidate network access point place candidate network and the correspondence relationship information of Network Access Point according to the service node of each network that gets access in advance from described information server and the correspondence relationship information of Network Access Point.

5. heterogeneous network switch method as claimed in claim 4 is characterized in that, the current service network of described terminal obtains the correspondence relationship information of the service node and the Network Access Point of each network in advance from described information server, comprising:

The service node of the service network that described terminal is current obtains the correspondence relationship information of the service node and the Network Access Point of each network from described information server when being registered to described information server.

6. heterogeneous network switch method as claimed in claim 1 is characterized in that, the current service network of described terminal obtains the service node of candidate network and the correspondence relationship information of Network Access Point, comprising:

The current service network of described terminal obtains the correspondence relationship information of the service node and the Network Access Point of candidate network from the information server of media-independent.

7. heterogeneous network switch method as claimed in claim 6 is characterized in that, the current service network of described terminal obtains the correspondence relationship information of the service node and the Network Access Point of candidate network from described information server, comprising:

When the service node of the service network that described terminal is current is found the candidate network of described terminal,, carry the information of described candidate network to the message that described information server transmission information is obtained; Described information server obtains the correspondence relationship information of the service node and the Network Access Point of described candidate network, and sends to the service node of the current service network of described terminal by corresponding response message;

Perhaps, the service node of the current service network of described terminal obtains the correspondence relationship information of the service node and the Network Access Point of each network from described information server when registration; When the service node of the service network that described terminal is current is found the candidate network of described terminal, according to the correspondence relationship information of the service node and the Network Access Point of described each network that gets access to, obtain the correspondence relationship information of the service node and the Network Access Point of described candidate network.

8. heterogeneous network switch method as claimed in claim 1, it is characterized in that, the current service network of described terminal is inquired about the Network Access Point resource information of described candidate network respectively according to the described correspondence relationship information that acquires to the service node of described candidate network, comprising:

The service node of the service network that described terminal is current sends the switching query resource message of network-to-network respectively to the service node of described candidate network, carry the network insertion dot information corresponding with the service node of described candidate network;

The service node of described candidate network is inquired about its resource information to the Network Access Point of described correspondence respectively, and the resource information that inquires is sent to the service node of the current service network of described terminal.

9. as claim 2 or 6 described heterogeneous network switch methods, it is characterized in that the current service network of described terminal or described terminal obtains the correspondence relationship information of the service node and the Network Access Point of described candidate network from described information server, comprising:

The message that the current service network of described terminal or described terminal obtains to described information server transmission information is carried candidate network information;

Described information server is according to described candidate network information, and corresponding access network container obtains the service node identification information of described candidate network from described information server, and obtains the network insertion dot information from corresponding Network Access Point container; Perhaps, according to described candidate network information, neighbours' access network container list from described information server is obtained and described candidate network corresponding service node identification information, and obtains the network insertion dot information of described candidate network from corresponding access network container and Network Access Point container;

The service node identification information of the described candidate network that described information server will get access to and corresponding network insertion dot information send to described terminal or the current service network of described terminal that the information of sending is obtained message.

10. heterogeneous network switch method as claimed in claim 9 is characterized in that, stores the identification information with described access network container corresponding service node in the described access network container.

11. heterogeneous network switch method as claimed in claim 9, it is characterized in that, store the identification information of one or more service nodes in described neighbours' access network container list, the sign of each service node is corresponding with one or more access network containers in the described tabulation respectively.

12. a terminal is characterized in that, comprising:

13. a terminal is characterized in that, comprising:

14. the service node equipment of a media-independent is characterized in that, comprising: query requests processing module, candidate network enquiry module and hand-off process module;

15. the service node equipment of a media-independent is characterized in that, comprising: memory module, query requests processing module, candidate network enquiry module and hand-off process module;

16. the service node equipment of a media-independent is characterized in that, comprising: corresponding relation acquisition module, candidate network enquiry module and hand-off process module;

17. the information server of a media-independent is characterized in that, comprising:

18. information server as claimed in claim 17, it is characterized in that, neighbours' access network container list in the described memory module comprises one or more information units, be used to store the service node identification information of described media-independent, each information unit is corresponding with access network container in one or more described neighbours' access network container list.

19. information server as claimed in claim 17 is characterized in that, comprises an information unit in the access network container in the described memory module, is used to store the service node identification information of the media-independent corresponding with described access network container.