CN101765092B - Network switching method, device and system - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The embodiment of the invention discloses a network switching method, a device and a system. The network switching method of the embodiment of the invention comprises the following steps: obtaining hometown network address prefix information of mobile nodes from local mobile anchor points when the mobile nodes are moved from a first mobile network to a second mobile network; sending channel establishing requests to the local mobile anchor points after the completion of the access layer configuration between the local mobile anchor points and the mobile nodes according to the hometown network address prefix information for establishing channels between the local mobile anchor points and the mobile nodes; establishing channel information carrying the channel information exchanged with the local mobile anchor points (the channel information comprises channel address information and channel type information); and transferring the data to the mobile nodes through the channels established between the local mobile anchor points and the mobile nodes. When the embodiment of the invention is adopted, the data business on the local mobile anchor points and a novel mobile access gateway can not get lost when the network switching is carried out.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to a kind of method for switching network, Apparatus and system.
Background technology
In proxy mobile IP system, MAG (Mobile Access Gateway) simulates home link, to MN (Mobile Node, mobile node) announcement HNP (Home Network Prefix, the home network address prefix), make MN think that oneself is all the time on home link; MAG replaces MN to LMA (Local Mobility Anchor, local mobile anchor) sends logon message, on LMA, set up about home network address prefix information and Proxy-CoA (Proxy Care-of Address, act on behalf of Care-of Address) the banding cache clauses and subclauses, and between MAG and LMA, set up the message that a bidirectional tunnel is used to transmit MN.Its packet sending and receiving process is as follows:
Peer node sends message to the home address of mobile node, this message can be intercepted and captured by LMA, LMA sends to MAG by the tunnel between LMA and the MAG with message then and handles according to local prefix inquiry list of bindings then, and the destination address according to message after the MAG decapsulation sends to MN with message.
When mobile node was transmitted messages literary composition to peer node, MAG received that this message encapsulates, and increases outer IP heading (source address), then by the tunnel between MAG and the LMA, message is sent to LMA, and LMA peeling outer layer IP heading is transmitted to peer node with the internal layer message.
When acting on behalf of mobile IP v 6 as the interconnection agreement of heterogeneous network (as WiMAX and 3GPP), MN (Mobile Node, mobile node), for example portable terminal is in heterogeneous network when mobile, based on the network switching process of proxy mobile IPv 6 as shown in Figure 1:
Wherein, pMAG (Previous Mobile Access Gateway, preceding Mobile Access Gateway) is arranged in a kind of inserting technology networks, and nMAG (new Mobile Access Gateway, new Mobile Access Gateway) is arranged in another kind of inserting technology networks.In the internet system, pMAG is connected to identical LMA (Local Mobility Anchor, local mobile anchor) with nMAG.
The inventor finds that there is following shortcoming in prior art in implementing process of the present invention:
New Mobile Access Gateway is being set up bidirectional tunnel simultaneously in the registration process of local mobile anchor.This moment the former Mobile Access Gateway correspondence that local mobile anchor connects the data traffic transmission of portable terminal from IF1 the tunnel, switched to the new Mobile Access Gateway that IF2 connects.Because correspondence is the address of new Mobile Access Gateway in the banding cache clauses and subclauses of preserving on the local mobile anchor, so portable terminal (IF1) will be lost by local mobile anchor by the upstream data service that former Mobile Access Gateway sends; And because do not finish as yet, so local mobile anchor will be lost by new Mobile Access Gateway to the downstream data traffic that portable terminal (IF2) sends attached to IP address configuration and/or the radio link configuration of the portable terminal IF2 of new Mobile Access Gateway.
Summary of the invention
The invention process provides in a kind of method for switching network, Apparatus and system, the proxy mobile IP system and sets up tunnel approach, and when carrying out the network switching, the data service on local mobile anchor and the new Mobile Access Gateway can not lost.
The embodiment of the invention provides a kind of method for switching network, comprising:
When mobile node when first mobile network moves to second mobile network, obtain the home network address prefix information of mobile node from local mobile anchor;
According to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests, with set up and described local mobile anchor between the tunnel; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
By and described local mobile anchor between the tunnel set up, transmit data to described mobile node.
The embodiment of the invention also provides a kind of method of setting up the tunnel, is applied to comprise in the proxy mobile IP system:
Mobile Access Gateway sends to local mobile anchor and sets up tunneled requests, the described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, and described tunnel information comprises tunnel address information, tunnel type information;
Described local mobile anchor is according to the described tunnel information that carries in the tunneled requests message of setting up, set up and described Mobile Access Gateway between the tunnel;
When the described tunnel type of setting up the tunnel type that comprises in the tunneled requests and the storage of described local mobile anchor not simultaneously, described local mobile anchor is according to configured strategy, determine the tunnel between foundation and the described Mobile Access Gateway, the tunnel type in the described local mobile anchor among the mobile node binding buffer entries BCE is the tunnel type in the tunnel between local mobile anchor and the former Mobile Access Gateway.
Correspondingly, the embodiment of the invention also provides a kind of Mobile Access Gateway, comprising:
Network address acquisition module, when mobile node when first mobile network moves to second mobile network, obtain the home network address prefix information of mobile node from local mobile anchor;
The tunnel information request module, according to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests, with set up and described local mobile anchor between the tunnel; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
Data forwarding module, be used for by and described local mobile anchor between the tunnel set up, transmit data to described mobile node.
Correspondingly, the embodiment of the invention also provides a kind of network switched system, comprising: Mobile Access Gateway and local mobile anchor;
Described Mobile Access Gateway, be used for when mobile node when first mobile network moves to second mobile network, be used for obtaining the home network address prefix information of mobile node from local mobile anchor; And according to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests; By and described local mobile anchor between the tunnel set up, transmit data to described mobile node; Wherein, the described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
Described local mobile anchor is used for returning to described second mobile network's Mobile Access Gateway the home network address prefix information of described mobile node; Receive described Mobile Access Gateway set up tunneled requests after, set up and described Mobile Access Gateway between the tunnel.
Implement the present invention, have following beneficial effect:
The embodiment of the invention provides to be set up tunnel approach and is applied in a kind of proxy mobile IP system, by in setting up tunneled requests, carrying the tunnel information that comprises tunnel address information and tunnel type information, thereby make the process of tunnel negotiation be totally independent of the registration process of agent binding update.
The method for switching network that the embodiment of the invention provides, device and system, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information that mobile node uses among second mobile networks from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 sets up the tunnel approach flow chart in a kind of proxy mobile IP system of the embodiment of the invention;
Fig. 2 is the structural representation of a kind of mobile option of the embodiment of the invention;
Fig. 3 is a flow chart of setting up the specific implementation method in tunnel in the another kind of proxy mobile IP system of the embodiment of the invention;
Fig. 4 is the structural representation of the another kind of mobile option of the embodiment of the invention;
Fig. 5 is a flow chart of setting up the specific implementation method in tunnel in the another kind of proxy mobile IP system of the embodiment of the invention;
Fig. 6 is the method flow diagram that a kind of network of the embodiment of the invention switches;
Fig. 7 is the flow chart of the another kind of method for switching network of the embodiment of the invention;
Fig. 8 is a kind of network switched system structural representation of the embodiment of the invention;
Fig. 9 is a kind of proxy mobile IP system configuration diagram of separating with data surface based on chain of command of the embodiment of the invention;
Figure 10 is the structural representation of a kind of Mobile Access Gateway of the embodiment of the invention;
Figure 11 is the structural representation of the another kind of Mobile Access Gateway of the embodiment of the invention;
Figure 12 is the structural representation of a kind of local mobile anchor of the embodiment of the invention.
Embodiment
The invention process provides in a kind of method for switching network, Apparatus and system, the proxy mobile IP system and sets up tunnel approach, makes mobile node when carrying out the network switching, and the data service on local mobile anchor and the new Mobile Access Gateway can not lost.
Referring to Fig. 1 is the flow chart of setting up tunnel approach in a kind of proxy mobile IP system of the embodiment of the invention.
Wherein, when described first network node was Mobile Access Gateway, described second network node was a local mobile anchor; Perhaps, when described first network node was local mobile anchor, described second network node was a Mobile Access Gateway.
Optionally, the address, tunnel in the described tunnel information, tunnel type can be carried by a mobile option or two different mobile options.
When the described tunnel type of setting up the tunnel type that comprises in the tunneled requests and described second network node stores not simultaneously, described second network node is according to configured strategy, determine to set up and described first network node between the tunnel.
Implement to set up tunnel approach in the above-mentioned proxy mobile IP system, by in setting up tunneled requests, carrying tunnel informations such as comprising address, tunnel, tunnel type, can be at the tunnel node (as local mobile anchor, Mobile Access Gateway) starts the back and carry, thereby make the process of tunnel negotiation be independent of the registration process of agent binding update by (Heartbeat) message of the heartbeat in the proxy mobile IP system or notice (Notification) message or agent binding update messages.
Set up tunnel approach in the proxy mobile IP system of the embodiment of the invention, except the exchange process that comprises the address, tunnel also comprises tunnel encapsulation mode negotiation and Tunnel Identifier exchange process.To be described in detail with regard to this tunnel negotiation process below.
At first need to prove, in the system based on proxy mobile IP protocol, realize the negotiations process of address, tunnel, on realizing, can increase a new mobile option in agent binding update messages, also is data surface tunnel address option.
Referring to Fig. 2, be the schematic diagram of mobile option embodiment among the present invention, in the present invention, this mobile option is the data surface address option, wherein:
Type: the type identification of representing this mobile option.Here represent that this option is the address, tunnel.
Length: representing the length of this mobile option, is the length of address, tunnel here, 16 bytes.
Address, tunnel: the address, data surface tunnel that is MAG or LMA here.When the data surface address was consistent with control plane address, this tunnel address option can be with.Have only when inconsistent, need in PBU/PBA message (or other PMIPv6 related news), have this tunnel address option.
Referring to Fig. 3, the flow process of setting up the tunnel approach specific implementation in a kind of proxy mobile IP system of the embodiment of the invention is as follows:
Need to prove that from nMAG, above-mentioned mobile option can be regarded as the expansion of Alternate CoA option.But for LMA, above-mentioned mobile option is a new mobile option.
In the system based on proxy mobile IP protocol, adopt tunnel style to transmit,, can also expand proxy mobile IP protocol in order to implement tunnel negotiation method of the present invention, increase a new mobile option, so that carry tunnel type and Tunnel Identifier relevant information.
Referring to Fig. 4, be the structural representation of the another kind of mobile option of embodiment among the present invention, wherein:
Type: type is expressed as the Tunnel Identifier option here;
Length: length, the length of expression Tunnel Identifier option.
Tunnel type: any tunnel type is adopted in expression, as 0 expression IPinIP tunnel, 1 expression GRE, 2 expression MPLS etc.
M: pattern, the negotiation of expression tunnel encapsulation pattern; 0 expression dynamic tunnel encapsulation.Must have the Tunnel Identifier field this moment.The static pre-configured tunnel of 1 expression.Can have or not have pre-configured Tunnel Identifier this moment.
K: sign, whether expression carries the Tunnel Identifier field.
Tunnel Identifier is determined corresponding mobile terminal etc. when being used for transmitting and receiving data; Usually, be carried in the message that Mobile Access Gateway sends and be called the downlink tunnel sign, be carried in the message that local mobile anchor sends and be called the uplink tunnel sign.
With GRE (Generic Routing Encapsulation, generic route encapsulation) tunnel tunnel mode negotiation and Tunnel Identifier exchange process are described below.
The tunnel mode negotiations process is as follows:
The gre tunneling encapsulation mode comprises and does not support the GRE encapsulation, static GRE encapsulation, dynamically GRE encapsulation;
A, do not support GRE encapsulation: the tunnel negotiation initiator does not have this Tunnel Identifier option in the registration process of acting on behalf of mobile update (PBU/PBA), perhaps tunnel type is set to 0 in the Tunnel Identifier option that has.
B, static GRE encapsulation: the tunnel negotiation initiator has above-mentioned Tunnel Identifier option in the registration process of acting on behalf of mobile update (PBU/PBA), putting M simultaneously is 1.
C, dynamically GRE encapsulation: the tunnel sleeve is gone up the initiator and have above-mentioned Tunnel Identifier option in the registration process of acting on behalf of mobile update (PBU/PBA), and putting M simultaneously is 0.
In the present embodiment, the tunnel negotiation initiator comprises Mobile Access Gateway and local mobile anchor.The scene that local mobile anchor is initiated the negotiation of tunnel encapsulation pattern has, but is not limited to:
A, when local mobile anchor configuration change or software upgrading, can be initiatively carry out the tunnel encapsulation pattern and hold consultation to the Mobile Access Gateway of its connection.
B, when not starting tunnel encapsulation (for example gre tunneling encapsulation) on the Mobile Access Gateway, local mobile anchor is in the type that has the tunnel encapsulation pattern of determining in the configuration information in the response message that Mobile Access Gateway sends.
C, when portable terminal when former Mobile Access Gateway moves to new Mobile Access Gateway, when this Mobile Access Gateway did not have this tunnel option when sending agent binding update, local mobile anchor had the tunnel type of determining in the configuration information in response message.
If Mobile Access Gateway and local mobile anchor need carry out the Tunnel Identifier exchange, then must comprise Tunnel Identifier option shown in Figure 5, K is set simultaneously is masked as 1, and have suitable Tunnel Identifier.
If K is masked as 1, and the length of the length field in Tunnel Identifier option indication is not when comprising the Tunnel Identifier field, and the Tunnel Identifier of then representing this direction is for empty.Can not carry out the transfer of data of this direction.For example, this Tunnel Identifier option is sent by Mobile Access Gateway, then represents the downlink tunnel direction for empty, and local mobile anchor does not need to send downlink data by the tunnel.
Implement the method for above-mentioned tunnel negotiation, nMAG is by carrying mobile option to setting up of LMA initiation in the tunneled requests, to consult tunnel type with LMA, tunnel encapsulation pattern, and the exchange of carrying out data surface address and Tunnel Identifier are being totally independent of outside the registration process of agent binding update, carry out the tunnel negotiation process, finish the exchange of data surface address, thereby set up the tunnel, carry out data traffic transmission.
Above-mentioned tunnel negotiation process further specifies as follows:
1, when LMA (for example the data surface interface inverting is to new interface) during the data surface address modification in some cases, LMA can initiatively initiate to be used to upgrade the message flow of address, data surface tunnel, after MAG accepts data surface address update request, new data surface tunnel will be safeguarded.
2, when LMA when carrying out route optimisation process, can initiate to set up two routing optimalities between MAG.
Fig. 5 specifically describes as follows for setting up the flow chart of the specific implementation method in tunnel in the another kind of proxy mobile IP system of the embodiment of the invention:
Step 2011, under the triggering of data surface or other signaling messages, LMA initiates to set up tunneled requests to MAG1, and it is set up at this and carries data surface tunnel address option in tunneled requests, wherein comprises the address, tunnel of MAG2.
Step 2012, MAG1 preserves this address, tunnel as the uplink tunnel address, and replys acknowledge message;
Step 2013, LMA initiates the tunnel negotiation process to MAG2, wherein carries data surface tunnel address option in request message, wherein comprises the address, tunnel of MAG1.
Step 2014, MAG2 preserves this address, tunnel as the uplink tunnel address, and replys acknowledge message;
As shown in Figure 5, wherein two steps of step 2011 and step 2013 may be carried out simultaneously, in no particular order order.
If MAG1 initiates the process of change address, data surface tunnel in some cases to LMA, then LMA will in time notify MAG2 to upgrade (address, tunnel of MAG1), and vice versa, the data surface address change of MAG2, and after then LMA received, notice MAG1 changed.
If MN1 switches to MAG3 from MAG1, then LMA is updated to MAG2 with the data surface address of MAG3 after MAG3 acts on behalf of MN1 and registers.
Implement above-mentioned tunnel negotiation method, LMA can initiate to set up two routing optimalities between MAG.
Referring to Fig. 6, the method flow diagram that switches for a kind of network of the embodiment of the invention.
At first, mobile node moves to from first mobile network before second mobile network, at first Mobile Access Gateway of first interface attached to first mobile network, at second interface attached to second Mobile Access Gateway among second mobile network; Need to prove that described first interface and second interface are logic interfacing, in specific implementation, can be same physical interface, perhaps two different physical interfaces.
Implement above-mentioned method for switching network, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information of mobile node from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Referring to Fig. 7, be the flow chart of the another kind of method for switching network of the embodiment of the invention.
In the present embodiment, mobile node is specially portable terminal.
Step 400, portable terminal (on IF1) is attached on the former Mobile Access Gateway.
Step 401, former Mobile Access Gateway is initiated proxy binding register message to local mobile anchor, for MN sets up corresponding binding buffer entries BCE and data surface tunnel.First registration process, if other servers such as AAA be (Authentication Authorization Accounting, authentication authorized charging server) etc. do not allocate the home network address prefix information in advance for portable terminal, local mobile anchor is that portable terminal distributes the home network address prefix information.Wherein, the data surface tunnel of foundation comprises combination in any information such as address, tunnel, tunnel type, Tunnel Identifier, and these information are kept in the binding buffer entries of setting up into MN.
Step 402, former Mobile Access Gateway sends route announcement to portable terminal (IF1), has the home network address prefix information that distributes for portable terminal IF1.
Step 403, portable terminal are carried out the wireless access configuration in this locality, wherein may carry out alternately with network, to carry out address duplicate address detection etc.
Said process is finished, and portable terminal will communicate by tunnel and the peer node of setting up between former Mobile Access Gateway and the local mobile anchor, the transceive data bag.
Step 404 when portable terminal moves to new mobile network, perhaps needs under the situations such as reliability maintenance of its interface to switch to when working under the new interface IF2, and portable terminal (at IF2) is attached on new mobile network's the new Mobile Access Gateway.
In adhering to mobile network's process, link layer information or the CAMEL-Subscription-Information etc. of new Mobile Access Gateway by portable terminal recognizes that portable terminal is to carry out handoff preparation phase on this interface, and whether the expression portable terminal to be ready switching on the IF2.
Step 405, new Mobile Access Gateway is initiated first agent binding update (PBU, Proxy Binding Update) message to local mobile anchor, but does not comprise tunnel identification information, promptly in step 405, does not carry out tunnel negotiation.In some implementations, tunnel information is necessary, then can have specific address, tunnel or Tunnel Identifier, as address, empty tunnel or Tunnel Identifier etc.; With the expression just in handoff preparation phase, wouldn't downlink data receiving.
Local mobile anchor is accepted the PBU request, creates new binding buffer entries, for portable terminal (IF2) distributes the home network address prefix information;
Step 406, new Mobile Access Gateway sends route announcement to portable terminal, has the home network address prefix information that distributes for portable terminal IF2.If this home network address prefix is consistent with local prefix on the portable terminal IF1, then have sign this moment, require portable terminal IF2 not do address conflict and detect.If inconsistent, then new Mobile Access Gateway can require portable terminal IF2 to do the address conflict detection or be decided in its sole discretion by it.
Step 407, portable terminal are carried out the wireless access configuration in this locality.
Step 408, whether the configuration of new Mobile Access Gateway detection portable terminal wireless access finishes (as address configuration, radio configuration etc.) is finished.Feasible detection mode has, and detects portable terminal and whether sends link layer handoff completion message or upstream data or IP layer message (route requests) etc.
Step 409, new Mobile Access Gateway sends the updating message of second agent binding update (PBU) to local mobile anchor, carry the tunnel information that exchanges with local mobile anchor in this PBU message, described tunnel information comprises tunnel address information, tunnel type information and tunnel identification information.
When the described tunnel type of setting up the tunnel type that comprises in the tunneled requests and described second network node stores not simultaneously, described second network node is according to configured strategy, determine to set up and described first network node between the tunnel.
Be specially: new Mobile Access Gateway will determine and local mobile anchor between set up the tunnel type in tunnel.If new Mobile Access Gateway is supported the tunnel type between former Mobile Access Gateway and the local mobile anchor, then select consistent tunnel, and generate corresponding tunnel sign etc.If the tunnel type that ought describedly set up the tunnel type that comprises in the tunneled requests and described second network node stores is not simultaneously, and new Mobile Access Gateway is supported the tunnel type between former Mobile Access Gateway and the local mobile anchor, adopt gre tunneling between for example former Mobile Access Gateway and the local mobile anchor, and new Mobile Access Gateway and the pre-configured MPLS of local mobile anchor tunnel, then this stylish Mobile Access Gateway will distribute the Tunnel Identifier of new tunnel type, and carry in PBU to local mobile anchor; Alternatively, in PBU, also comprise former tunnel information.And before newly setting up the tunnel, will set up mapping relations one by one between the Tunnel Identifier of different tunnel types, so that can navigate to identical BCE data field when receiving downstream data traffic, and transmit.
Step 410, local mobile anchor allow new Mobile Access Gateway to send upstream data, then in response message, have tunnel information, comprise tunnel address information, tunnel type information and tunnel identification information etc.
When the described tunnel type of setting up the tunnel type that comprises in the tunneled requests and described second network node stores not simultaneously, described second network node is according to configured strategy, determine to set up and described first network node between the tunnel.
Be specially: the tunnel type (yet being the tunnel type in the tunnel between local mobile anchor and the former Mobile Access Gateway) in mobile node binding buffer entries BCE in tunnel type that new Mobile Access Gateway has and the local mobile anchor is not simultaneously, local mobile anchor will be checked configured strategy, here strategy will indicate whether to allow to change tunnel type, for example policy flag is set to 1, expression allows, be 0, expression does not allow.Strategy can dispose at each mobile node, perhaps disposes (all mobile nodes that also promptly are registered to local mobile anchor are deferred to this configured strategy) at this mobile anchor point.
According to configured strategy, if do not allow to change tunnel type, then refuse this and set up tunneled requests, reply the proxy binding acknowledgment messages of failure, have the conditional code that does not allow to change tunnel type; If allow to change tunnel type, then accept to set up tunneled requests, will distribute the Tunnel Identifier of new tunnel type this moment, and carry to new Mobile Access Gateway by the proxy binding acknowledgment messages of success.Simultaneously, in order to guarantee data integrity, local mobile anchor may need to receive the data service of former Mobile Access Gateway or send data service to former Mobile Access Gateway, to set up the mapping relations one by one between the new Tunnel Identifier of two kinds of different tunnel types this moment on the local mobile anchor, so that can both retrieve identical BCE data field according to different Tunnel Identifiers when transceive data is professional, and transmit.At last, the local mobile anchor handover network, the tunnel between foundation and the new Mobile Access Gateway carries out transfer of data.
Alternatively, after finishing said process, local mobile anchor is initiated binding to former Mobile Access Gateway and is cancelled process, perhaps waits standby communication terminal to disconnect from former Mobile Access Gateway, acts on behalf of the mobility binding log off procedure.
Implement above-mentioned method for switching network, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information of mobile node from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Referring to Fig. 8, be a kind of network switched system structural representation of the embodiment of the invention.
Network switched system in the present embodiment comprises: new Mobile Access Gateway 21, local mobile anchor 3; Optionally, described system also comprises: mobile node 1, former Mobile Access Gateway 20;
New Mobile Access Gateway 21, when mobile node 1 when first mobile network moves to second mobile network, be used for obtaining the home network address prefix information of mobile node 1 from local mobile anchor 3;
Local mobile anchor 3 is used for returning the home network address prefix information that mobile node 1 uses to second mobile network's new Mobile Access Gateway 21 in described second mobile network;
After new Mobile Access Gateway 21 was finished access layer configuration according to described home network address prefix information, new Mobile Access Gateway 21 sent to local mobile anchor 3 and sets up tunneled requests, with the tunnel between foundation and the local mobile anchor 3; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
Local mobile anchor 3 be used for receive new Mobile Access Gateway 21 set up tunneled requests after, set up and the new tunnel between the Mobile Access Gateway 21;
New Mobile Access Gateway 21 be used for by and local mobile anchor 3 between the tunnel set up, transmit data to mobile node 1.
Implement above-mentioned network switched system, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information of mobile node from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Based on proxy mobile IP system framework such as Fig. 9 that chain of command separates with data surface, Fig. 9 is a kind of proxy mobile IP system configuration diagram of separating with data surface based on chain of command of the embodiment of the invention.
As shown in Figure 9, in proxy mobile IP system, MAG and LMA have control plane address and data surface address separately respectively.Wherein control plane address is used for control procedures such as the mutual registration of MAG and LMA, renewal, cancellation, and the data surface address is to be used for the packet that MN is transmitted in proxy-mobile IP tunnel between MAG and the LMA.This data surface address packet is contained in the contextual data region of setting up into each MN (for example BCE Binding Cache Entry banding cache district).
Above-mentioned MAG goes up the contextual data region of setting up for each MN, comprises the following option (other uncorrelated with this programme unlisted) in the table 1
Table 1
Correspondingly, the last contextual data region for each MN foundation of LMA comprises the following option of table 2 (other uncorrelated with this programme unlisted).
Table 2
In the realization of proxy mobile IPv 6 agreement, control plane address that is to say the source address of agent binding update (registration/response) message.The data surface address then is carried at the mobile option of tunnel negotiation.
Referring to Fig. 8, the another embodiment of network switched system among the present invention is described equally.
Alleged network switched system is based on the proxy mobile IP system that chain of command (proxy binding register process) separates with data surface (tunnel) in the present embodiment, it adopts registration process and sets up the mode that tunneling process separates, and solves the data-bag lost problem that portable terminal exists when the heterogeneous network based on proxy mobile IP protocol switches.
To describe portable terminal 1 in the network switched system in the present embodiment in detail, former Mobile Access Gateway 20, new Mobile Access Gateway 21, the function of local mobile anchor 3 and effect;
To switch to new Mobile Access Gateway 21 (nMAG) from former Mobile Access Gateway 20 (pMAG) preceding when portable terminal 1, and an interface IF1 of portable terminal 1 still keeps communicating by letter with pMAG20, and another interface IF2 is connected to nMAG21.
NMAG21 registers to LMA3 earlier, and nMAG21 inserts or CAMEL-Subscription-Information etc. learns that portable terminal 1 will switch to IF2 from IF1 from the link layer of portable terminal 1, and in the preparatory stage, then only sends agent binding update (PBU) message to LMA3, registers;
LMA3 accepts register requirement, replys binding acknowledgement message to nMAG21, carries to be portable terminal 1 distribution home address prefix HNP.NMAG21 sends advertising of route to portable terminal 1, sends the home network address prefix information on the IF2 of portable terminal 1.
Implement above-mentioned network switched system, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information of mobile node from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Referring to Figure 10, be the structural representation of a kind of Mobile Access Gateway of the embodiment of the invention.
Mobile Access Gateway in the present embodiment comprises:
Network address acquisition module 200, when mobile node when first mobile network moves to second mobile network, obtain the home network address prefix information that mobile node uses from local mobile anchor among second mobile networks;
Tunnel information request module 201, according to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests, with set up and described local mobile anchor between the tunnel; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
Implement above-mentioned Mobile Access Gateway, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information of mobile node from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Referring to Figure 11 is the structural representation of the another kind of Mobile Access Gateway of the embodiment of the invention.
Mobile Access Gateway in the present embodiment, have the network address acquisition module 200 identical, tunnel information request module 201, data forwarding module 202 with Figure 11, in the present embodiment, to further specify network address acquisition module 200 and tunnel information request module 201, wherein network address acquisition module 200 specifically is used for sending first agent binding update messages to obtain the home network address prefix information of mobile node from local mobile anchor to local mobile anchor.Need to prove that in some implementations, tunnel information is necessary, then can have specific address, tunnel or Tunnel Identifier, as address, empty tunnel or Tunnel Identifier etc.; With the expression just in handoff preparation phase, wouldn't downlink data receiving.
Local mobile anchor is accepted the PBU request, creates new binding buffer entries, for portable terminal (IF2) distributes the home network address prefix;
Tunnel information request module 201 specifically is used for sending second agent binding update messages to described local mobile anchor, in described second agent binding update messages, carry tunnel information, with the indication local mobile anchor, described second Mobile Access Gateway has been in and has switched the ready stage, prepares downlink data receiving.Described tunnel address information specifically can be the data surface address; Need to prove that tunnel information request module 201 also needed to detect the configuration of portable terminal wireless access and whether finishes (as address configuration, radio configuration etc.) and finish before sending second agent binding update messages.Feasible detection mode has, and detects portable terminal and whether sends link layer handoff completion message or upstream data or IP layer message (route requests) etc.
Mobile Access Gateway in the present embodiment also comprises:
Tunnel Identifier sending module 203 is used for the tunnel type of the tunnel information that carries according to second agent binding update messages, sends and tunnel type corresponding tunnel sign to local mobile anchor.When also comprising the tunnel encapsulation pattern in the tunnel information that second agent binding update messages carries, then Tunnel Identifier sending module 203 is to local mobile anchor transmission and tunnel type and tunnel encapsulation pattern corresponding tunnel sign.
Mobile Access Gateway in the present embodiment, when mobile node when first mobile network moves to second mobile network, at first obtain the home network address prefix information of mobile node from local mobile anchor; After mobile node is finished the configuration of Access Layer, just set up and described local mobile anchor between the tunnel, thereby make that mobile node can not lost by local mobile anchor by the upstream data service that the Mobile Access Gateway among first mobile network sends because the address of the Mobile Access Gateway among first mobile network who preserves on the local mobile anchor can not replaced by the address of the Mobile Access Gateway among second mobile network; And local mobile anchor can not lost by the Mobile Access Gateway among second mobile network to the downstream data traffic that mobile node sends yet.
Referring to Figure 12, be the structural representation of a kind of local mobile anchor of the embodiment of the invention.
Local mobile anchor in the present embodiment comprises:
Network address sending module 30, when mobile node when first mobile network moves to second mobile network, the Mobile Access Gateway in described second mobile network returns the home network address prefix information of described mobile node;
Set up tunnel module 31, be used for receive described Mobile Access Gateway set up tunneled requests after, set up and described Mobile Access Gateway between the tunnel; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information.
Described local mobile anchor also comprises: upgrade the tunnel module, the tunnel type that is used for describedly setting up tunnel type that tunneled requests comprises and described second network node stores is not simultaneously, described second network node is determined the tunnel between foundation and described first network node according to configured strategy.
Local mobile anchor in the present embodiment, be in when preparing switch step receiving Mobile Access Gateway, not during the notification of information of downlink data receiving, local mobile anchor only distributes the home network address prefix information for portable terminal, and after portable terminal is finished the wireless access configuration, local mobile anchor just sends the information of downlink data to Mobile Access Gateway, make that portable terminal can not lost by local mobile anchor by the upstream data service that former Mobile Access Gateway sends because preserving the address of former Mobile Access Gateway on the local mobile anchor can just not replaced by the address of new Mobile Access Gateway in registration process; And after newly the portable terminal wireless access configuration of Mobile Access Gateway is finished, carry out transfer of data again, so local mobile anchor can not lost by new Mobile Access Gateway to the downstream data traffic that portable terminal sends.
Above-mentioned mobile node, Mobile Access Gateway, local mobile anchor are realized tunnel negotiation and the idiographic flow of network switching such as the description among above-mentioned method for switching network and the tunnel negotiation method embodiment, description among its function in the network switched system and effect as the above-mentioned network switched system embodiment repeats no more.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (10)
1. a method for switching network is characterized in that, comprising:
When mobile node when first mobile network moves to second mobile network, obtain the home network address prefix information of mobile node from local mobile anchor;
According to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests, with set up and described local mobile anchor between the tunnel; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
By and described local mobile anchor between the tunnel set up, transmit data to described mobile node.
2. method for switching network as claimed in claim 1 is characterized in that, the described home network address prefix information that obtains mobile node from local mobile anchor specifically comprises:
Mobile Access Gateway among described second mobile network sends first agent binding update messages to obtain the home network address prefix information of mobile node from local mobile anchor to local mobile anchor, the tunnel information that in this first agent binding update messages, does not carry tunnel information or carry null value, with the indication local mobile anchor, described second Mobile Access Gateway is in handoff preparation phase, does not receive data.
3. method for switching network as claimed in claim 1 or 2 is characterized in that, the described transmission to local mobile anchor set up tunneled requests, comprising:
Mobile Access Gateway among second mobile network sends second agent binding update messages to described local mobile anchor, in described second agent binding update messages, carry tunnel information, with the indication local mobile anchor, described Mobile Access Gateway has been in and has switched the ready stage, prepares to receive data.
4. method for switching network as claimed in claim 3 is characterized in that, also comprises in the described tunnel information: the tunnel encapsulation pattern information, and/or with described tunnel type and the corresponding tunnel identification information of described tunnel encapsulation pattern.
5. a method of setting up the tunnel is applied in the proxy mobile IP system, it is characterized in that, comprising:
Mobile Access Gateway sends to local mobile anchor and sets up tunneled requests, the described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, and described tunnel information comprises tunnel address information, tunnel type information;
Described local mobile anchor is according to the described tunnel information that carries in the tunneled requests message of setting up, set up and described Mobile Access Gateway between the tunnel;
When the described tunnel type of setting up the tunnel type that comprises in the tunneled requests and the storage of described local mobile anchor not simultaneously, described local mobile anchor is according to configured strategy, determine the tunnel between foundation and the described Mobile Access Gateway, the tunnel type in the described local mobile anchor among the mobile node binding buffer entries BCE is the tunnel type in the tunnel between local mobile anchor and the former Mobile Access Gateway.
6. a Mobile Access Gateway is characterized in that, comprising:
Network address acquisition module, when mobile node when first mobile network moves to second mobile network, obtain the home network address prefix information of mobile node from local mobile anchor;
The tunnel information request module, according to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests, with set up and described local mobile anchor between the tunnel; The described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
Data forwarding module, be used for by and described local mobile anchor between the tunnel set up, transmit data to described mobile node.
7. Mobile Access Gateway as claimed in claim 6, it is characterized in that, described network address acquisition module specifically is used for sending first agent binding update messages to obtain the home network address prefix information of mobile node from local mobile anchor to local mobile anchor, the tunnel information that in this first agent binding update messages, does not carry tunnel information or carry null value, with the indication local mobile anchor, described second Mobile Access Gateway is in handoff preparation phase, does not receive data.
8. as claim 6 or 7 described Mobile Access Gateways, it is characterized in that, described tunnel information request module specifically is used for sending second agent binding update messages to described local mobile anchor, in described second agent binding update messages, carry tunnel information, with the indication local mobile anchor, described second Mobile Access Gateway has been in and has switched the ready stage, prepares to receive data.
9. Mobile Access Gateway as claimed in claim 7 is characterized in that, also comprises in the tunnel information: the tunnel encapsulation pattern information, and/or with described tunnel type and the corresponding tunnel identification information of described tunnel encapsulation pattern.
10. a network switched system is characterized in that, comprising: Mobile Access Gateway, local mobile anchor;
Described Mobile Access Gateway, be used for when mobile node when first mobile network moves to second mobile network, be used for obtaining the home network address prefix information of mobile node from local mobile anchor; And according to described home network address prefix information, finish and described mobile node between access layer configuration after, send to local mobile anchor and to set up tunneled requests; By and described local mobile anchor between the tunnel set up, transmit data to described mobile node; Wherein, the described tunnel information that carries in the tunneled requests with described local mobile anchor exchange of setting up, described tunnel information comprises tunnel address information, tunnel type information;
Described local mobile anchor is used for returning to described second mobile network's Mobile Access Gateway the home network address prefix information of described mobile node; Receive described Mobile Access Gateway set up tunneled requests after, set up and described Mobile Access Gateway between the tunnel.
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| PCT/CN2009/075776 WO2010072135A1 (en) | 2008-12-24 | 2009-12-21 | Method, device and system for network handoff |
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| CN103516603B (en) * | 2012-06-15 | 2019-01-15 | 中兴通讯股份有限公司 | A kind of routing optimization method, apparatus and system |
| WO2014101181A1 (en) * | 2012-12-31 | 2014-07-03 | 华为技术有限公司 | User equipment and method for heterogeneous network switch |
| CN103763145B (en) * | 2014-01-27 | 2019-12-13 | 上海斐讯数据通信技术有限公司 | Tunnel proxy method |
| EP3310099B1 (en) | 2015-07-15 | 2020-02-26 | Huawei Technologies Co., Ltd. | Ip address management method, device, ip address anchor and mobile node |
| CN113905109B (en) * | 2021-12-08 | 2022-03-22 | 深圳竹云科技有限公司 | Zero trust network data transmission method, device, equipment and computer storage medium |
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