CN101287283B - Method for implementing network switching and wireless communication system thereof - Google Patents
Method for implementing network switching and wireless communication system thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for realizing the network switching. The method includes that: during the process that a terminal carries out the switching of a link layer from a serving network to a target network; mobility management information of a network layer is carried in a link layer switching message to be transmitted; the mobility management information of the network layer carried in the link layer switching message is utilized to carry out the mobility management of the network layer. The embodiment of the invention also discloses a wireless communication system which comprises a terminal, a target network PoS and a serving network PoS. By adopting the method of the invention, the performance for the network switching can be improved.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of technology that realizes that network switches.
Background technology
When the terminal from current service cell when neighbor cell moves; The terminal can be according to channel quality, and (Serving PoS) switches to the phase neighbor networks by the current service network service point, to guarantee communication quality; This switching is not only carried out in identical network, can also between heterogeneous networks, carry out.Present mobile communications network has developed and has been the multiple network such as microcellulor network and macrocellular network and the situation of depositing; Such as the microcellulor network of support IEEE802.11 standard and the macrocellular network of supporting standards such as third generation affiliate (3GPP, ThirdGeneration Partnership Project), 3GPP2, IEEE802.16.And the cellular network of supporting various criterion may intersect covering each other, thereby, when the terminal was roamed between these heterogeneous networks, the switching between heterogeneous networks will take place.And when the terminal is switched between heterogeneous networks; Can select best network connection type automatically; Realize the seamless switching speech channel; Promptly realize that through the medium type of supporting various criterion network switches, generally adopt the lower-layer protocols in the mobility management protocol stack method of unified interface to be provided, make the processing of upper-layer protocol not rely on characteristic and characteristic that terminal and wireless network have because of the support various criterion the upper strata.Such as; In 802.21 standards, introduced a kind of professional successional framework that switches of guaranteeing between the different media types; Promptly these handoff functionality collection of configuration form a new protocol layer in the mobility management protocol stack of network element; Be referred to as media-independent and switch (MIH, Media Independent Handover) protocol layer.
Fig. 1 is the sketch map of MIH protocol layer.As shown in Figure 1; The MIH protocol layer can be thought 2.5 layer protocols; Its position is between three layers the link layer protocol of various support various criterion access networks of the network layer protocol that is used for mobile management and application and two layers, and its upper strata comprises mobility management protocol and switchover policy, transmission and application etc. such as MIPv4/v6.Its lower floor is exactly various Access Network link layer protocol, as 802.3,802.11,802.16 and 3GPP etc.The MIH layer is the media independent handoff protocol layer, and its major function is to provide the handoff procedure between the different media types.
Realize that network switching process comprises that mainly link layer switches and the network layer mobility management process, realize that at present the method that network switches is that the switching of link layer and the switching of network layer are simply carried out according to the order before and after switching.At first, the switching of carrying out link layer is prepared and is consulted; Then, carry out the switching of link layer; Then, carry out the network layer mobile management, promptly carry out the mobile management of network layer in the network of the mobility management protocol of network layer after switching.
Fig. 2 realizes the schematic flow sheet that network switches in 802.21 agreements.As shown in Figure 2; The characteristic that information server (Information Server) is used to store each neighbor networks, terminal are mobile node (MN, Mobile Node); Service network PoS is the residing current network PoS of MN, such as the attachment point or the couple in router of current network.The terminal is passed through to each candidate network PoS (Candidate PoS) inquiry available network resources, thereby carries out the selection of objective network PoS, specifically may further comprise the steps:
Step 201:MN sends to information server and obtains information request message (MIH_Get_Information request).
MN is through sending the information that MIH_Get_Information request comes the query candidate network to information server.
Step 202: information server sends to MN and obtains info response message (MIH_Get_Information response).
Information server returns MIH_Get_Information response so that the information of candidate network to be provided to MN.
Step 203:MN sends terminal Handover candidate inquiry request message (MIH_MN_HO_Candidate_Query request) to service network PoS.
MN triggers switching through sending MIH_MN_HO_Candidate_Query request to service network PoS.Comprise possible candidate network tabulation in this request message.
Step 204: service network PoS sends switchable resource inquiry request message (MIH_N2N_HO_Query_Resources request) between net to each candidate network PoS respectively.
After service network PoS receives this message, send MIH_N2N_HO_Query_Resources request to each candidate network PoS respectively, promptly to each candidate network PoS inquiry available network resources.
Step 205: each candidate network PoS sends switchable resource query response message (MIH_N2N_HO_Query_Resources response) between net to service network PoS.
Each candidate network PoS is through MIH_MN_HO_Candidate_Query response, and the Query Result of each candidate network resource is returned to service network PoS.
Step 206: service network PoS sends terminal Handover candidate inquiry response message (MIH_MN_HO_Candidate_Query response) to the terminal.
Service network PoS is through MIH_MN_HO_Candidate_Query response, and the Query Result of each candidate network resource is returned to MN.MN carries out confirming of objective network according to the Query Result of receiving.
Step 207:MN sends the terminal handoff candidate to service network PoS and carries out request message (MIH_MN_HO_Candidate_Commit request).
After objective network was confirmed, MN sent MIH_MN_HO_Candidate_Commit request to service network PoS, was used for indicating terminal and prepared to begin to set up being connected of link layer with new network.
Step 208: service network PoS sends the network handoff candidate to objective network PoS and carries out request message (MIH_Net_HO_Candidate_Commit request).
After service network PoS receives this message, transmit MIH_Net_HO_Candidate_Commit request, be used for notification target network: MN and prepare to begin to set up being connected of link layer with new network to selected objective network PoS.Here, the hypothetical target network is a candidate network 1.
Step 209: objective network PoS sends the network handoff candidate to service network PoS and carries out response message (MIH_Net_HO_Candidate_Commit response).
Step 210: service network PoS sends the terminal handoff candidate to MN and carries out response message (MIH_MN_HO_Candidate_Commit response).
Service network PoS transmits MIH_MN_HO_Candidate_Commit response to MN, is used to notify the result of switching submission.Show that link layer switches completion, high level begins to switch.
Step 211:MN sends the terminal to objective network PoS and switches completion request message (MIH_MN_HO_Complete request)
When link layer switch and high-rise the switching after, MN is to objective network PoS transmission MIH_MN_HO_Complete request, be used for notification target network: MN successful switch to objective network.
Step 212: objective network PoS sends to switch between net to service network PoS and accomplishes request message (MIH_N2N_HO_Complete request).
Step 213: service network PoS sends to switch between net to objective network PoS and accomplishes response message (MIH_N2N_HO_Complete response).
Service network PoS handles Internet resources after receiving this message accordingly, and returns to objective network PoS to result through MIH_N2N_HO_Complete response.
Step 214: objective network PoS sends the terminal to MN and switches completion response message (MIH_MN_HO_Complete response).
Objective network PoS transmits the terminal to MN and switches and accomplish response message (MIH_MN_HO_Complete response), and former service network is returned to MN to the result of resource.
Fig. 2 has specifically provided the link layer switching flow, and as far as network layer, to different switching requirements; Correspondingly mobility management protocol is also arranged; Such as, be used to accelerate fast moving IP (FMIP, the Fast Mobile IP) agreement that MN switches; And based on network local mobile management (NetLMM, Network based Local Mobility Management) agreement etc. that is used to reduce handoff delay.Be example only below, specify the network layer handoff procedure under specific mobility management protocol with the FMIP agreement.Fig. 3 is a FMIP agreement switching flow sketch map, referring to Fig. 3, and old couple in router (PAR; Previous AccessRouter) be the current couple in router that MN connected, can be corresponding to the service network PoS among Fig. 2, new couple in router (NAR; New Access Router) can be corresponding to the objective network PoS among Fig. 2, according to the FMIP agreement, before MN inserts NAR; Just, make when MN one is connected to NAR for MN disposes new Care-of Address (NCoA, New Care-of Address); Just can use this Care-of Address immediately, specifically may further comprise the steps:
Step 301:MN sends route requests agent advertisement (RtSolPr, Router Solicitationfor Proxy Advertisement) to PAR.
When predicting, MN oneself will switch or in case when being found to a new access point and existing, then send RtSolPr message to PAR, this message is used to notify PAR:MN to switch, and needed information is switched in request.
Step 302:PAR sends to MN and acts on behalf of route announcement (PrRtAdv, Proxy RouterAdvertisement).
PAR returns PrRtAdv message as response to MN, the network prefix information that this message provides NAR to use to MN.
Step 303:MN sends quick binding message (FBU, Fast Binding Update) to PAR.
When MN prepares to switch and confirms the access point of required switching, then to utilize from the network prefix information of the corresponding NAR of PAR acquisition new access point and carry out the configuration of NCoA, network prefix information is carried in the agent router notice message.After NCoA configures; MN sends FBU message to PAR; Be used for before switching, just carrying out binding and the address conflict detection of NCoA through PAR and NAR; PAR also can set up the data channel between PAR and the NAR through follow-up preparation switching notice process simultaneously, the packet that sends to old Care-of Address is forwarded on the NCoA of MN.
Step 304:PAR sends to switch to NAR and initiates message (HI, Handover Initiate).
After PAR receives the FBU message of MN, send HI message informing NAR:MN to NAR and prepare to switch fast, carried the NCoA information that MN configures in this message, binding and address conflict that NAR then can carry out NCoA detect.
Step 305:NAR to PAR send switch acknowledgment message (HAck, HandoverAcknowledgement).
After NAR receives HI message, carry out address conflict according to the NCoA information that obtains and detect.If address conflict, then NAR is MN configuration NCoA again, and through HAck message this information is returned to PAR.Step 306:PAR sends quick binding acknowledgement message (FBack, Fast BindingAcknowledge) to MN.
After PAR receives quick binding acknowledgement message (HAck), its information of carrying is returned to MN through FBack message.
Step 307:MN disconnection is connected with PAR's.
Step 308:PAR transmits packet to NAR.
The packet that the NAR storage receives uses in order to flow.
Step 309:MN foundation is connected with NAR's.
Step 310:MN sends quick neighbours' announcement message (FNA, Fast NeighborAdvertisement) to NAR.
In case MN inserts NAR, then MN sends FNA to NAR, and announcement MN has been linked into NAR.
Step 311: new couple in router is transmitted the packet of storage to MN.
According to the FMIP protocol requirement, step 301 should be carried out before link layer switches to step 306, that is to say; Before link layer switches; MN needs to obtain network prefix information through network layer protocol message in advance, and the NCoA of configuration MN, accomplishes the process that address conflict detects.
Analysis through the above-mentioned method that link layer and network layer are switched; Can find out; The method that realizes the network switching in order that adopts this link layer switching and network layer to switch at present because terminal and network side do not carry out the negotiation of network layer mobility management protocol, is prone to cause after the link layer switching is accomplished at the terminal; Owing to the different failures that cause whole switching of mobility management protocol that terminal and network side are supported, switch the risk of call drop afterwards thereby increased.
Simultaneously,, also can increase the time that session rebulids, cause handoff delay to increase, thereby also increase the risk of switching call drop because the order that link layer switches and network layer is switched carries out.
In sum, adopt the method that network switches that realizes at present, its performance of handoffs is lower.
Summary of the invention
In view of this, the embodiment of the invention is to provide a kind of method that realizes that network switches, and this method can improve the performance that network switches.
The embodiment of the invention is to provide a kind of wireless communication system, and this system can improve the performance that network switches.
For achieving the above object; The technical scheme of the embodiment of the invention specifically is achieved in that a kind of method that realizes that network switches; This method comprises: carried out in the process of link layer switching to objective network by service network at the terminal, the network layer mobility management information is carried in the link switchover message transmits; Utilization is carried at link layer and switches the network layer mobility management information in the message, carries out the network layer mobile management.
A kind of wireless communication system, this system comprises: terminal, objective network service point PoS, service network PoS;
Described terminal; Be used to receive the link layer of sending from service network PoS or objective network PoS that carries the network layer mobility management information and switch message; Utilization is carried at link layer and switches the network layer mobility management information in the message, carries out the network layer mobile management, and triggers when switching at the terminal; Utilization is carried at link layer and switches the network layer mobility management information in the message, determines objective network and carries out the network layer mobile management;
Described service network PoS; The link layer that carries the network layer mobility management information that is used to receive self terminal or objective network PoS to send switches message; Utilization is carried at link layer and switches the network layer mobility management information in the message, carries out the network layer mobile management, and when network side triggers switching; Utilization is carried at the network layer mobility management information that link layer switches candidate network in the message, determines objective network and carries out the network layer mobile management;
Described objective network PoS is used to receive the link layer of self terminal or service network PoS to switch message, carries out the network layer mobile management.
Visible by technique scheme; The method and system that the realization network that the embodiment of the invention provides switches; The network layer mobility management information is carried in the link switchover message transmits, can utilize the link layer that carries the network layer mobility management information to switch message, before network layer is switched, carry out the management of corresponding mobile property in advance; Can reduce handover delay, improve the performance that network switches.
Description of drawings
Fig. 1 is the sketch map of MIH protocol layer in the prior art.
Fig. 2 realizes the schematic flow sheet that network switches in 802.21 agreements in the prior art.
Fig. 3 is a FMIP protocol network layer switching flow sketch map in the prior art.
The method flow diagram that the realization network that Fig. 4 provides for first embodiment of the invention switches.
The method flow diagram that the realization network that Fig. 5 provides for second embodiment of the invention switches.
The method flow diagram that the realization network that Fig. 6 provides for third embodiment of the invention switches.
The method flow diagram that the realization network that Fig. 7 provides for four embodiment of the invention switches.
The method flow diagram that the realization network that Fig. 8 provides for fifth embodiment of the invention switches.
The system configuration sketch map that the realization network that Fig. 9 provides for sixth embodiment of the invention switches.
Figure 10 is a mobile management architectural framework sketch map in the network switching process in the embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is done further explain.
A kind of method that realizes that network switches that the embodiment of the invention provides is: carried out in the process of link layer switching to objective network PoS by service network at the terminal; The network layer mobility management information is carried in the link switchover message transmits; Utilization is carried at link layer and switches the network layer mobility management information in the message, accomplishes corresponding network layer mobile management function.
Be that 802.21 standards are example with two-layer protocol below, attempt six embodiment explanations and utilize the link layer of two-layer protocol to switch the method that message realizes that network switches.Wherein, First and third, four and five embodiment are respectively the support FMIP, the level that trigger at the terminal and move IP (HMIP; Hierarchical MobileIP), proxy-mobile IP (PMIP; Proxy Mobile IP) and the fast network handoff procedure of NetLMM agreement, the network switching process of the support FMIP that triggers for network side of second embodiment.Because the embodiment of the invention has adopted the method for transport network layer mobility management information in link switchover message; Therefore, also can HMIP agreement, PMIP agreement and NetLMM agreement be called quick level mobile IP protocol, Express agent mobile IP protocol and quick local local mobility management protocol respectively.
Embodiment one:
A kind of method flow diagram of realizing that network switches that Fig. 4 provides for first embodiment of the invention.Present embodiment is that MN triggers the network switching process of supporting FMIP agreement mobility management protocol.In the present embodiment, at first, utilize link layer to switch the negotiation that message is carried out the mobility management protocol that MN and network side support; Then, utilize link layer to switch message and carry out objective network PoS and comprise obtaining of the network information such as network prefix, fulfil the process that dynamic network is found ahead of schedule; In addition, also utilize link layer to switch configuration and address conflict detection that message is carried out the Care-of Address under the objective network PoS, fulfil address configuration and collision detection ahead of schedule; Mutual through service network PoS and objective network PoS, prior notice objective network PoS sets up the data channel of link layer and network layer simultaneously.Thereby; In the present embodiment; Network layer mobility management information in that link layer switches in the message is: the NCoA information after the NCoA information of the mobility management protocol information of candidate network, the network prefix information of each candidate network, configuration and the detection specifically may further comprise the steps referring to Fig. 4:
Step 401:MN to information server send carry the mobility management protocol request obtain information request message (MIH_Get_Information request).
In the present embodiment; In the MIH_Get_Information request message of MN to the information server transmission; Carry request mobility management protocol information element (TYPE_IE_SUPPORTED_MOBILITY_MANAGEMENT_PROTOCOL), be used for the mobility management protocol of being supported to each candidate network of information server acquisition request.
Step 402: what information server sent the mobility management protocol information carry each candidate network support to MN obtains info response message (MIH_Get_Information response).
In the present embodiment, information server returns MIH_Get_Information response message to MN, carries the mobility management protocol information that each candidate network is supported in this message.
Step 403:MN sends the terminal Handover candidate inquiry request message (MIH_MN_HO_Candidate_Query request) of the network prefix request of carrying each candidate network to service network PoS.
In the present embodiment, MN sends terminal Handover candidate inquiry request message (MIH_MN_HO_Candidate_Query request) to service network PoS and triggers switching, carries the network prefix solicited message of each candidate network in this message.
Step 404: service network PoS sends switchable resource inquiry request message (MIH_N2N_HO_Query_Resources request) between the net of the network prefix solicited message of carrying each candidate network to each candidate network PoS respectively.
In the present embodiment; After service network PoS receives this message; Send MIH_N2N_HO_Query_Resources request message to each candidate network PoS respectively; Be used to inquire about the available resources of each candidate network, also carried the network prefix solicited message of each candidate network simultaneously in this message, be used for to each candidate network request network prefix (Network Prefix).
Step 405: each candidate network PoS sends switchable resource query response message (MIH_N2N_HO_Query_Resources response) between net to service network PoS.
In the present embodiment, each candidate network is returned MIH_N2N_HO_Query_Resources response message to service network PoS, carries the network prefix of each candidate network in this message.
Step 406: service network sends handoff candidate network inquiry response message (MIH_MN_HO_Candidate_Query request) between the net of the network prefix carry each candidate network to MN.
In the present embodiment, service network PoS transmits MIH_MN_HO_Candidate_Queryrequest message to MN, and the resource query result and the network prefix of each candidate network returned to MN.
When the selection of objective network is carried out according to each candidate network resource query result in the terminal, also carry out mobility management protocol.The method of carrying out mobility management protocol comprises: the link layer that carries the network layer mobility management protocol information of neighbor networks or candidate network support through parsing switches message; Obtain the network layer mobility management protocol that each neighbor networks or candidate network are supported; From supporting the neighbor networks of identical network layer protocol with the terminal; The candidate network of confirming to switch is perhaps from supporting to confirm the objective network that switches the candidate network of identical network layer protocol with the terminal.Here, neighbor networks, candidate network, objective network, three's scope is descending.The method of confirming objective network in the prior art is: the first step: from neighbor networks, select candidate network according to the neighbor networks characteristic earlier; Second step: again according to resource query result select target network from candidate network; The embodiment of the invention has increased the mobility management protocol negotiations process; This process can be carried out in the first step, also can carry out in second step.After objective network is confirmed; Whether the network prefix of further differentiating objective network is consistent with the subnet prefix of service network; When the subnet prefix of the network prefix of objective network and service network is inconsistent, then carry out the configuration of the NCoA of MN according to the prefix of selected objective network.
Step 407:MN carries out request message (MIH_MN_HO_Candidate_Commit request) to the terminal handoff candidate that service network PoS sends the NCoA information of carrying configuration.
In the present embodiment, after choosing objective network PoS, MN sends MIH_MN_HO_Candidate_Commit request message to service network PoS, the NCoA information that this message can the carried terminal configuration.In the present embodiment, hypothetical target network PoS is a candidate network 1.
Step 408: service network PoS carries out request message (MIH_Net_HO_Candidate_Commit request) to the network handoff candidate that objective network PoS sends the NCoA information of carrying configuration.
In the present embodiment, service network PoS sends MIH_Net_HO_Candidate_Commit request message to objective network PoS, and the NCoA information that disposes is transmitted to objective network PoS.
Objective network is carried out the request message from the network handoff candidate, and the NCoA information that extracts the MN configuration is carried out duplicate address detection, if address conflict, then objective network is MN configuration NCoA information again.
Step 409: objective network PoS carries out response message (MIH_Net_HO_Candidate_Commit response) to the network handoff candidate that service network PoS sends the NCoA information after carrying detection.
In the present embodiment, objective network PoS sends the network handoff candidate to service network PoS and carries out response message (MIH_Net_HO_Candidate_Commit response), the result after the return address is detected.This message can be carried the NCoA information after the detection.
Step 410: service network PoS sends terminal handoff candidate network to MN and carries out response message (MIH_MN_HO_Candidate_Commit response).
In the present embodiment; Service network PoS sends MIH_MN_HO_Candidate_Commitresponse message to MN; Show that link layer switch to accomplish, the result after will detecting through this message simultaneously is transmitted to MN, while service network PoS begin to set up and objective network PoS between the network layer data passage; And carry out the forwarding of packet between service network PoS and the objective network PoS, to carry out the switching of network layer.
Step 411:MN sends the terminal to objective network PoS and switches completion request message (MIH_MN_HO_Complete request).
When link layer switch all execute with the network layer handoff procedure after, MN is to objective network PoS transmission MIH_MN_HO_Complete request, be used for notification target network: MN successful switch to objective network.After objective network PoS receives this message, begin to transmit the packet of storage to MN.
Step 412-step 414 is identical with step 212-step 214 of the prior art, does not give unnecessary details one by one here.
In the present embodiment; Consult the mobility management protocol that MN and network side are supported earlier; Avoiding occurring link layer switches to after the new network; Because inconsistent, the incompatible customer service that causes of the mobility management protocol that MN and network side are supported can't rebulid and the danger of call drop, guarantees normally carrying out of whole switching flow.
Also can carry the mobility management protocol that each candidate network is supported in the present embodiment through the MIH_N2N_HO_Query_Resources response message that each candidate network PoS returns.Trigger in the flow process of switching at MN; After service network PoS receives the MIH_N2N_HO_Query_Resources response message of carrying the mobility management protocol that each candidate network supports; The mobility management protocol information of each candidate network being supported through corresponding response message MIH_MN_HO_Candidate_Query response returns to MN, and the mobility management protocol that MN supports according to each candidate network that obtains helps the selection of objective network.
Also can carry the network prefix of each candidate network in the present embodiment, thereby make MN obtain the network prefix of each candidate network through the MIH_Get_Informationresponse message that information server returns.
MN and network side are at the handoff preparation phase mobility management protocol that both sides supported through consultation in the present embodiment; Avoiding occurring link layer switches to after the new network; Because inconsistent, the incompatible customer service that causes of the mobility management protocol that MN and network side are supported can't rebulid and the danger of call drop, thereby guarantees normally carrying out of whole switching flow.
Present embodiment is fulfiled network discovery, network address configuration, address conflict detection ahead of schedule through utilizing link layer to switch message, thereby has shortened the time-delay of switching, thereby improves user experience.
In addition; Present embodiment passed through the mutual of service network PoS and objective network PoS before switching; The data channel of can the prior notice objective network setting up link layer and network layer simultaneously; Reduce switching to after the new objective network, carry out the process that link layer data channel and network layer data passage are set up successively, greatly reduce the data interruption time that causes in the handoff procedure.
Embodiment two:
A kind of method flow diagram of realizing that network switches that Fig. 5 provides for second embodiment of the invention.Present embodiment is that network side trigger network layer-two mobility management agreement is the network switching process of quick level type mobile IP protocol.In the present embodiment, be: the NCoA information after the NCoA information of the network prefix information of the mobility management protocol information of candidate network and solicited message thereof, each candidate network and solicited message thereof, configuration and the detection at the network layer mobility management information that link layer switches in the message.Concrete steps are following:
Step 501: service network PoS to information server send carry the mobility management protocol request obtain information request message (MIH_Get_Information request).
In the present embodiment; Service network PoS sends MIH_Get_Informationrequest message to information server; Through carrying the information element TYPE_IE_POA_SUBNET_INFORMATION of request mobility management protocol, be used for the mobility management protocol of being supported in this message to each candidate network of information server acquisition request.
Step 502: what information server sent the mobility management protocol information carry each candidate network support to service network PoS obtains info response message (MIH_Get_Information response)
Step 503: service network PoS sends network Handover candidate inquiry request message (MIH_Net_HO_Candidate_Query request) to MN.
In the present embodiment, send MIH_Net_HO_Candidate_Query request message through service network PoS to MN and trigger switching.
Step 504:MN sends network handoff candidate network inquiry response message (MIH_Net_HO_Candidate_Query response) to service network PoS.
Step 505: service network PoS sends switchable resource inquiry request message (MIH_N2N_HO_Query_Resources request) between the net that carries the network prefix request to each candidate network PoS.
In the present embodiment, after service network PoS receives this response message, send MIH_N2N_HO_Query_Resources request message to each candidate network respectively, be used for to each candidate network query available resources.Can also carry the network prefix information requested in this message simultaneously, be used for to each candidate network request network prefix.
Step 506: each candidate network PoS sends switchable resource query response message (MIH_N2N_HO_Query_Resources response) between the net that carries network prefix to service network PoS.
In the present embodiment, each candidate network is sent MIH_N2N_HO_Query_Resources response message to service network PoS, carries the network prefix of each candidate network in this message.
Mobility management protocol information that service network is supported according to each candidate network and the resource query result who returns carry out the selection of objective network.
Step 507: service network PoS sends the network handoff candidate that carries configuration NCoA solicited message to objective network PoS and carries out request message (MIH_Net_HO_Candidate_Commit request).
In the present embodiment; After choosing objective network; Service network PoS sends MIH_Net_HO_Candidate_Commit request message to objective network PoS; And whether the network prefix of further differentiating objective network is consistent with the subnet prefix of service network, when the subnet prefix of the network prefix of objective network and service network is inconsistent, need in this message, carry the solicited message of configuration MN at the NCoA of objective network PoS.In the present embodiment, the hypothetical target network is a candidate network 1.
After objective network is received this message,, carry out the configuration of NCoA for MN according to the network prefix information of oneself.
Step 508: objective network PoS carries out response message (MIH_Net_HO_Candidate_Commit response) to the network handoff candidate that service network PoS sends the NCoA information of carrying configuration
In the present embodiment, objective network PoS sends MIH_Net_HO_Candidate_Commit response message to service network PoS, the result of return address configuration, and this message is carried the NCoA information after the configuration.Simultaneously service network PoS set up in advance and objective network PoS between the network layer data passage, and carry out the forwarding of packet between service network PoS and the objective network PoS.
Step 509: service network PoS carries out request message (MIH_MN_HO_Candidate_Commit request) to the terminal handoff candidate that MN sends the NCoA information of carrying configuration.
In the present embodiment, service network PoS sends MIH_MN_HO_Candidate_Commitrequest message to MN, and the result of address configuration is returned to MN, carries the NCoA information after the configuration in this message.
Step 510:MN sends the terminal handoff candidate to service network PoS and carries out response message (MIH_MN_HO_Candidate_Commit response).
Step 511:MN sends the terminal to objective network PoS and switches completion request message (MIH_MN_HO_Complete request).
When link layer switch all execute with the network layer handoff procedure after, MN is to objective network PoS transmission MIH_MN_HO_Complete request, be used for notification target network: MN successful switch to objective network.After objective network PoS receives this message, begin to transmit the packet of storage to MN.
Step 512-step 514 is identical with step 212-step 214 of the prior art, does not give unnecessary details one by one here.
Also can carry the mobility management protocol that each candidate network is supported in the present embodiment through the MIH_N2N_HO_Query_Resources response message that each candidate network PoS returns.Trigger in the flow process of switching at network side, after service network was received this message, the mobility management protocol according to each candidate network that obtains is supported helped to carry out the selection of objective network.
Can carry the network informations such as network prefix of each candidate network in the present embodiment through the MIH_Get_Information response message that information server returns, obtain the network information of each candidate network.
MN and network side are at the handoff preparation phase mobility management protocol that both sides supported through consultation in the present embodiment; Avoiding occurring link layer switches to after the new network; Because inconsistent, the incompatible customer service that causes of the mobility management protocol that MN and network side are supported can't rebulid and the danger of call drop, guarantees normally carrying out of whole switching flow.
Present embodiment can utilize link layer to switch message and fulfil network discovery, network address configuration, address conflict detection ahead of schedule, thereby has shortened the time-delay of switching, thereby improves user experience.
In addition; Present embodiment passed through the mutual of service network PoS and objective network PoS before network layer is switched; The data channel of can the prior notice objective network setting up link layer and network layer simultaneously; Reduce switching to after the new objective network, carry out the process that link layer data channel and network layer data passage are set up successively, greatly reduce the data interruption time that causes in the handoff procedure.
Embodiment three:
A kind of method flow diagram of realizing that network switches that Fig. 6 provides for third embodiment of the invention.Present embodiment is that the network layer mobility management protocol that MN triggers is the network switching process of HMIP agreement.The purpose of HMIP agreement is through using hierarchical setting, at home agent (HA, Home Agent) and couple in router (AR; Access Router) introduces between and move anchor point (MAP; MobileAnchor Point), make MN in the MAP territory intra, promptly do not need in the handoff procedure between the AR under this MAP to bind with the HA of far-end; But carry out local forwarding address (LCoA with local MAP; On-link CoA) Binding Update promptly only needs to the new LCoA of MAP registration, thereby reduces the time-delay of switching.Only stride and just need carry out the overall forwarding address (RCoA, Regional CoA) of MN and rebuilding of LCoA when switch in the MAP territory simultaneously, set up with HA and new MAP and bind.In the present embodiment; Do not adopt mobility management protocol to consult, thereby be: the NLCoA information under each candidate network after the NLCoA information of the network prefix information of the network prefix information in MAP territory, each candidate network and solicited message thereof, configuration and the detection at the network layer mobility management information that link layer switches in the message.
What describe in the present embodiment is the switching of MN in the MAP territory; MN carries out the new on-link care-of address (NLCoA in the MAP territory according to selected objective network; New on-link CoA) configuration of address, and utilize link layer switching message that the NLCoA information that configures is sent to objective network PoS.After objective network is received NLCoA information, carry out DAD and detect, and testing result is returned to MN.Accomplish when switching; The MN successful switch is behind objective network, and MN sends local binding update messages (LBU to old mobile anchor point (PMAP, PreviousMobile Anchor Point); Local Binding Update), notice PMAP carries out the binding of NLCoA and RCoA.After PMAP receives this message, return to local binding acknowledgement message of MN (LBA, Local Binding Acknowledgement).Referring to Fig. 6, PAR is the current couple in router that MN connected, corresponding to service network PoS.Then corresponding to objective network PoS, present embodiment mainly may further comprise the steps NAR:
Step 601:MN send to information server the network prefix request carry MAP territory under each candidate network and each candidate network the network prefix request obtain information request message (MIH_Get_Information request).
In the present embodiment, MN sends MIH_Get_Information request message to information server, carries the network prefix solicited message of each candidate network in this message, and the network prefix solicited message in the affiliated MAP territory of each candidate network.
Step 602: information server send to MN the network prefix carry MAP territory under each candidate network and each candidate network network prefix obtain info response message (MIH_Get_Informationresponse).
Step 603-step 606 is identical with step 203-step 206 of the prior art, does not give unnecessary details one by one here.
Mobility management protocol information that the terminal is supported according to each candidate network and the resource query result who returns carry out the selection of objective network.After objective network is confirmed, the network prefix of further differentiating MAP territory under the objective network whether with switch before different, if consistent, the just intra in the MAP territory of MN be described, then carry out the configuration of NLCoA according to the prefix of the objective network of selecting.
Step 607:MN carries out request message (MIH_MN_HO_Candidate_Commit request) to the terminal handoff candidate that service network sends the NLCoA information of carrying configuration.
After selected good objective network PoS, MN sends MIH_MN_HO_Candidate_Commit request message to service network PoS, carries the NLCoA information of configuration in this message.In the present embodiment, the hypothetical target network is a candidate network 2.
Step 608: service network PoS carries out request message (MIH_Net_HO_Candidate_Commit request) to the network handoff candidate that objective network PoS sends the NLCoA information of carrying configuration.
After objective network PoS received this message, the NLCoA information that therefrom extracts the MN configuration was carried out duplicate address detection, if address conflict, then objective network PoS is MN configuration NLCoA information again.
Step 609: objective network PoS carries out response message (MIH_Net_HO_Candidate_Commitresponse) to the network handoff candidate that service network PoS sends the NLCoA information after carrying detection.
Step 610: service network PoS carries out response message (MIH_MN_HO_Candidate_Commit response) to the terminal handoff candidate that MN sends the NLCoA information after carrying detection, and the result after the address detected is returned to MN.
MN according to the NLCoA information of obtaining in advance, carries out the switching of network layer immediately after executing the link layer switching.In the present embodiment; The switching of this network layer comprises that MN sends the Binding Update that local binding update messages (LBU) carries out NLCoA to PMAP; And PMAP returns local binding update messages (LBU) to MN; And begin to set up the network layer data passage between peer node MAP and the objective network PoS processes such as forwarding of the line data bag of going forward side by side.
Step 611-step 614 is identical with step 211-step 214 of the prior art, does not give unnecessary details one by one here.
The embodiment of the invention also can be carried the network prefix of each candidate network through the MIH_N2N_HO_Query_Resources response message that each candidate network is returned, and obtains the network prefix information of each candidate network.
The embodiment of the invention can also be carried the network prefix in MAP territory under each candidate network through the MIH_N2N_HO_Query_Resources response message that each candidate network is returned, and obtains the network prefix information in MAP territory under each candidate network.
The method of the embodiment of the invention is applicable to that too network side triggers the process of switching.
Present embodiment can utilize link layer to switch message and fulfil network address configuration, address conflict detection ahead of schedule, thereby has shortened the time-delay of switching, thereby improves user experience.
In addition; Present embodiment passed through the mutual of service network PoS and objective network PoS before network layer is switched; The data channel of can the prior notice objective network setting up link layer and network layer simultaneously; Reduce switching to after the new objective network, carry out the process that link layer data channel and network layer data passage are set up successively, greatly reduce the data interruption time that causes in the handoff procedure.
Embodiment four:
A kind of method flow diagram of realizing that network switches that Fig. 7 provides for four embodiment of the invention.Present embodiment is that MN trigger network layer-two mobility management agreement is the network switching process of proxy-mobile IP (PMIP, ProxyMobile IP) agreement mobility management protocol.The purpose of PMIP agreement is to make MN in handoff procedure; Need not carry out that new IP address obtains, duplicate address detection; Only need be on HA with the home address (HoA of MN; Home Address) and newly act on behalf of the address of mobile anchor point (NPMA, New Proxy Mobile Anchor) and bind, reduced handoff delay and eated dishes without rice or wine interface signaling.According to the PMIP protocol requirement; Need not obtain the network informations such as network prefix in the present embodiment and come to be configured in advance the IP address in the new network; And after only need carrying out objective network selected in the resource query result that MN returns according to each candidate network, utilize link layer to switch message the HoA of MN is sent to objective network PoS, after objective network PoS receives the HoA of MN; With the HA Binding Update, set up in advance and peer node HA between the network layer data passage.Thereby the network layer mobility management information that switches in the message at link layer is: the HoA information of MN.Referring to Fig. 7, service network PoS is corresponding to the old mobile anchor point (PPMA, Previous Proxy MobileAnchor) of acting on behalf of in the PMIP agreement, and objective network PoS is corresponding to the NPMA in the PMIP agreement, and present embodiment mainly may further comprise the steps:
Step 701-step 706 is identical with the step 201-step 206 of prior art.
Step 707:MN sends the terminal handoff candidate to service network PoS and carries out request message (MIH_MN_HO_Candidate_Commit request).
After choosing objective network PoS, MN sends MIH_MN_HO_Candidate_Commit request message, the HoA information of having carried MN in this message to service network PoS.In the present embodiment, the hypothetical target network is a candidate network 2.
Step 708: service network PoS carries out request message (MIH_Net_HO_Candidate_Commit request) to the network handoff candidate that objective network PoS sends the HoA information of carrying MN.
The MIH_Net_HO_Candidate_Commit request message of the HoA information of service network PoS through carrying MN is transmitted to objective network PoS with the HoA information of MN.
Step 709: objective network PoS sends Binding Update (BU, Binding Update) message to HA.
In the present embodiment, the Care-of Address of MN is exactly the IP address of objective network PoS.
Step 710:HA to objective network PoS send binding acknowledgement message (BA, BindingAcknowledgement).
In the present embodiment, HA returns BA message to objective network PoS and gives and reply, and begins to set up in advance the network layer data passage of HA and objective network PoS.
Step 711: objective network PoS sends the network handoff candidate to service network PoS and carries out response message (MIH_Net_HO_Candidate_Commit response).
Step 712: service network PoS sends the terminal handoff candidate to MN and carries out response message (MIH_MN_HO_Candidate_Commit response).
Step 713-step 716 step 211-of the prior art step 214 is identical, does not give unnecessary details one by one here.
When the MN successful switch after objective network, just can accomplish forwarding of data through setting up good tunnel among the step 709-710 in advance.
The method of the embodiment of the invention is applicable to that too network side triggers the process of switching.
Present embodiment passed through the mutual of service network PoS and objective network PoS before switching; The data channel of can the prior notice objective network setting up link layer and network layer simultaneously; Reduce and switch to after the new objective network; Carry out the process that link layer data channel and network layer data passage are set up successively, greatly reduce the data interruption time that causes in the handoff procedure.
Embodiment five:
A kind of method flow diagram of realizing that network switches that Fig. 8 provides for fifth embodiment of the invention.Present embodiment is that MN trigger network layer-two mobility management agreement is NetLMM agreement and the network switching process of supporting the local mobile management.The purpose of NetLMM agreement is to make MN in local mobile administrative domain, not change the IP address in the moving process; Need not carry out promptly that new IP address obtains, duplicate address detection, to processes such as overall mobile anchor point registration NCoA, reduced handoff delay and eated dishes without rice or wine interface signaling.
Because service network and objective network are all supported the local mobile management; And in same local mobile management domain; Only need to manage the switching of the MN under the different AR under this LMA, and need not notify possible far-end overall situation mobile management anchor point through identical local mobile anchor point (LMA, Local Mobile Anchor); Such as network elements such as HA, and only guarantee after switching, to arrive new AR to the data of MN through the conversion of data channel under the LMA.Thereby in the present embodiment; At MN selected target network and after service network notification target network: MN prepares to begin to switch; Objective network PoS and LMA carry out Location Registration; And need not to notify the mobile management anchor point of far-end, and reduce the signaling transmission time, set up the tunnel between objective network and the peer node LMA in advance.In the present embodiment, the network layer mobility management information that switches in the message at link layer is: the location registration information of carrying out to LMA.Referring to Fig. 8; Service network PoS is corresponding to the old Mobile Access Gateway in the NetLMM agreement (PMAG, Previous Mobile Access Gateway), and objective network PoS is corresponding to new Mobile Access Gateway (NMAG; New Mobile Access Gateway), specifically may further comprise the steps:
Step 801-step 806 is identical with step 201-step 206 of the prior art.
Step 807:MN sends the terminal handoff candidate to service network PoS and carries out request message (MIH_MN_HO_Candidate_Commit request).
After the selected good objective network PoS, MN sends MIH_MN_HO_Candidate_Commit request message to service network PoS.In the present embodiment, the hypothetical target network is a candidate network 2.
Step 808: service network PoS sends the network handoff candidate to objective network PoS and carries out request message (MIH_Net_HO_Candidate_Commit request).
Step 809: objective network PoS sends location registration message (LocationRegistration) to LMA.
After objective network PoS receives this message; Send location registration message to LMA; The position log-on messages such as network prefix and LMA sign that comprise objective network sign, MN sign, objective network in this message, be used for prior notice LMA have one the MN preparation request NetLMM of creation state serve.
Step 810:LMA sends acknowledge message (Acknowledge) to objective network PoS
In the present embodiment, based target network of network prefix is for the packet that mails to MN is created handoff status.
Step 811: objective network PoS sends the network handoff candidate to service network PoS and carries out response message (MIH_Net_HO_Candidate_Commit response).
Step 812: service network PoS sends the terminal handoff candidate to MN and carries out response message (MIH_MN_HO_Candidate_Commit response).
Step 813-step 816 is identical with step 211-step 214, does not give unnecessary details one by one here.When the MN successful switch after objective network, through setting up good network layer data passage among the step 809-810 in advance, accomplish forwarding of data.
The method of the embodiment of the invention is applicable to that too network side triggers the process of switching.
The PMIP agreement that also is applicable to present embodiment realizes the process that the network of local local mobile management switches.Present embodiment passed through the mutual of service network PoS and objective network PoS before switching; The data channel of can the prior notice objective network setting up link layer and network layer simultaneously; Reduce and switch to after the new objective network; Carry out the process that link layer data channel and network layer data passage are set up successively, greatly reduce the data interruption time that causes in the handoff procedure.
Embodiment six
The system configuration sketch map that the realization network that Fig. 9 provides for sixth embodiment of the invention switches.This system comprises: terminal 910, objective network PoS920 and service network PoS930;
Service network PoS930; The link layer that carries the network layer mobility management information that receives self terminal 910 or objective network PoS920 to send switches message; Utilization is carried at link layer and switches the network layer mobility management information in the message; Carry out the network layer mobile management, and when network side triggers, utilize the network layer mobility management information that is carried at candidate network in the link layer switching message to determine objective network and carry out the network layer mobile management;
Objective network PoS920 receives the link layer of self terminal 910 or service network PoS930 to switch message, carries out the network layer mobile management.
Receiving element 911 receives the link layer of sending from service network 930 or objective network 920 that carries the network layer mobility management information and switches message, and the link layer that receives is switched message is input to performance element 912;
Service network PoS930 comprises service network PoS receiving element 931, service network PoS performance element 932;
Service network PoS receiving element 931, the link layer that carries the network layer mobility management information that receives self terminal 910 or objective network 920 to send switches message, and the link layer switching message that receives is input to service network PoS performance element 932;
Service network PoS performance element 932; The link layer that utilization is carried at 931 inputs of service network PoS receiving element switches the network layer mobility management information in the message; Carry out the negotiation of network layer mobility management protocol, obtain the network information of objective network or set up service network 930 in advance and the network layer data passage of 920 of objective networks in advance; And when network side triggers switching; Utilization is carried at the network layer mobility management information that link layer switches candidate network in the message, determines the objective network of switching.
Objective network PoS920 comprises objective network PoS receiving element 921, objective network PoS performance element 922;
Objective network PoS receiving element 921, the link layer that carries the network layer mobility management information that receives self terminal 910 or service network 930 to send switches message, and the link layer switching message that receives is input to objective network PoS performance element 922;
Objective network PoS performance element 922; The link layer that utilization is carried at 921 inputs of objective network PoS receiving element switches the network layer mobility management information in the message; The distribution and the address conflict that carry out the new Care-of Address under the objective network detect or set up in advance between service network and objective network, or the network layer data passage between peer node and objective network.
The method and system that the realization network that the foregoing description provides switches is not only applicable to realize in the IP mobile administrative domain that network switches; Also be applicable to multi-radio access technology and single wireless access technology; If what be directed against is multi-radio access technology; Then the mobile management architectural framework is shown in figure 10 in the network switching process, and Figure 10 is a mobile management architectural framework sketch map in the embodiment of the invention network switching process.Wherein, IP mobile management domain-functionalities can comprise that routing management and IP layer switch execution; Many RRMs domain-functionalities comprise many radio resource management functions (MRRM, Multi-Radio Resource Management).IP mobile administrative domain and many RRMs territory are as the client layer of media-independent switchable layer, and the function of media-independent switchable layer comprises that mainly contextual information transmission, handover management and instrument are selected and the triggering management.Lower floor is that the wireless access technology (RAT, Radio Access Technology) of various various criterions is corresponding to various Access Network link layer protocols.If what be directed against is single wireless access technology, then the many RRMs territory among Figure 10 deteriorates to the RRM territory of specific wireless connecting system.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method that realizes that network switches is characterized in that this method comprises: carried out receiving the link switchover message of carrying the network layer mobility management information in the process of link layer switching to objective network by service network at the terminal; Utilization is carried at link layer and switches the network layer mobility management information in the message, carries out the network layer mobile management; Saidly carry out the network layer mobile management and comprise following any one or combination in any:
Carry out the negotiation of network layer mobility management protocol, obtain the network information of objective network, the distribution of carrying out new Care-of Address under the objective network and address conflict in advance and detect, set up the network layer data passage between service network and objective network in advance and set up the network layer data passage between peer node and objective network in advance;
Said network layer mobility management information comprises: the network layer mobility management protocol that neighbor networks or candidate network are supported; Said negotiation method of carrying out the network layer mobility management protocol comprises: the link layer that carries the network layer mobility management protocol information of neighbor networks or candidate network support through parsing switches message; Obtain the network layer mobility management protocol that each neighbor networks or candidate network are supported; From supporting the neighbor networks of identical network layer protocol with the terminal; The candidate network of confirming to switch is perhaps from supporting to confirm the objective network that switches the candidate network of identical network layer protocol with the terminal;
Perhaps said network layer mobility management information comprises: the mobility management protocol that candidate network is supported; The perhaps network prefix information of candidate network; The perhaps network prefix information in mobile anchor point MAP territory, the perhaps new address information of terminal under objective network under the candidate network; The said method of obtaining the network information of objective network is: the link layer that carries the candidate network mobility management information through parsing switches message; Obtain the network layer mobility management information of each candidate network; After determining the objective network of switching; From the network layer mobility management information of each candidate network of obtaining, extract the network layer mobility management information of objective network, as the network information of objective network;
When perhaps the network layer mobility management protocol was fast moving IP agreement, said network layer mobile management information comprised: the NCoA information at terminal; The said method of setting up the network layer data passage between service network and objective network in advance comprises: the link layer that carries NCoA information through parsing switches message; Carry out the Binding Update of NCoA, set up the network layer data passage between service network PoS and the objective network PoS in advance;
When perhaps the network layer mobility management protocol was quick level type mobile IP protocol, said network layer mobility management information comprised: the network prefix information in MAP territory and the network prefix information of objective network under the objective network; The method that the said distribution of carrying out new Care-of Address under the objective network and address conflict detect comprises: the link layer switching message of the network prefix information in mobile anchor point MAP territory under the network prefix information of carrying objective network through parsing and the objective network; Obtain the network prefix information in MAP territory under network prefix information and the objective network of objective network, carry out new on-link care-of address NLCoA and/or distribution, the address conflict detection of overall forwarding address RCoA objective network under;
When perhaps said network layer mobility management protocol was quick level type mobile IP protocol, said network layer mobile management information comprised: the NLCoA information at terminal; The said method of setting up the network layer data passage between peer node and objective network in advance comprises: the link layer that carries NLCoA information through parsing switches message; Carry out the Binding Update of NLCoA in the MAP territory, set up the network layer data passage between MAP and the objective network PoS in advance;
When perhaps the network layer mobility management protocol was the Express agent mobile IP protocol, said network layer mobile management information comprised: the home address HoA information at terminal; The said method of setting up the network layer data passage between peer node and objective network in advance comprises: after confirming the objective network that switches; Link layer through resolving carried terminal home address HoA information switches message; On home agent HA, carry out the Binding Update of HoA, set up the network layer data passage between objective network PoS and the HA in advance.
2. the method that realization network according to claim 1 switches; It is characterized in that; At network layer network layer mobility management protocol is that Express agent mobile IP protocol or based on network local mobile management agreement are when realizing local fast local mobile management; The said method of setting up the network layer data passage between peer node and objective network comprises: after confirming the objective network that switches; The link layer that carries location registration information through parsing switches message, and objective network PoS and local mobile anchor LMA carry out Location Registration, set up the network layer data passage between objective network PoS and LMA in advance.
3. the method that realization network according to claim 1 and 2 switches; It is characterized in that; Described link layer switches message and comprises: the link layer that defines in 3GPP, 3GPP2 and IEEE 802 series standards switches message, or the media-independent in 802.21 agreements switches MIH layer switching message.
4. a wireless communication system is characterized in that, this system comprises: terminal, objective network service point PoS, service network PoS;
Described terminal; Be used to receive the link layer of sending from service network PoS or objective network PoS that carries the network layer mobility management information and switch message; Utilization is carried at link layer and switches the network layer mobility management information in the message, carries out the network layer mobile management, and triggers when switching at the terminal; Utilization is carried at link layer and switches the network layer mobility management information in the message, determines objective network and carries out the network layer mobile management;
Described service network PoS; The link layer that carries the network layer mobility management information that is used to receive self terminal or objective network PoS to send switches message; Utilization is carried at link layer and switches the network layer mobility management information in the message, carries out the network layer mobile management, and when network side triggers switching; Utilization is carried at the network layer mobility management information that link layer switches candidate network in the message, determines objective network and carries out the network layer mobile management;
Described objective network PoS is used to receive the link layer of self terminal or service network PoS to switch message, carries out the network layer mobile management.
5. wireless communication system according to claim 4 is characterized in that, described terminal comprises: receiving element and performance element;
Described receiving element is used to receive the link layer of sending from service network or objective network that carries the network layer mobility management information and switches message, and the link layer that receives is switched message is input to performance element;
Described performance element; Be used for utilizing the link layer that is carried at the receiving element input to switch the network layer mobility management information of message; Carry out the negotiation of network layer mobility management protocol, obtain the network information of objective network in advance; And when trigger to switch at the terminal, utilize to be carried at link layer and to switch the network layer mobility management information in the message, determine the objective network of switching.
6. wireless communication system according to claim 4 is characterized in that, described service network PoS comprises service network PoS receiving element, service network PoS performance element;
Described service network PoS receiving element, the link layer that carries the network layer mobility management information that is used to receive self terminal or objective network PoS to send switches message, and the link layer switching message that receives is input to service network PoS performance element;
Described service network PoS performance element; Be used for utilizing the link layer that is carried at the input of service network PoS receiving element to switch the network layer mobility management information of message; Carry out the negotiation of network layer mobility management protocol, in advance obtain the network information of objective network or set up service network PoS in advance and objective network PoS between the network layer data passage; And when network side triggers switching; Utilization is carried at the network layer mobility management information that link layer switches candidate network in the message, determines the objective network of switching.
7. wireless communication system according to claim 4 is characterized in that, described objective network PoS comprises objective network PoS receiving element, objective network PoS performance element;
Described objective network PoS receiving element, the link layer that carries the network layer mobility management information that is used to receive self terminal or service network PoS to send switches message, and the link layer switching message that receives is input to objective network PoS performance element;
Described objective network PoS performance element; Be used for utilizing the link layer that is carried at the input of objective network PoS receiving element to switch the network layer mobility management information of message; The distribution and the address conflict that carry out the new Care-of Address under the objective network detect; Or set up in advance between service network PoS and objective network PoS, or the network layer data passage between peer node and objective network PoS.
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| CN102387469B (en) * | 2010-08-30 | 2014-07-09 | 株式会社日立制作所 | Mobile access network gateway, multicast quick switching system and multicast quick switching method |
| CN106454966A (en) * | 2016-08-16 | 2017-02-22 | 深圳天珑无线科技有限公司 | Mobile phone and network switching method |
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