CN104735740A

CN104735740A - Route optimization method on MIPv6-PMIPv6 interaction scene

Info

Publication number: CN104735740A
Application number: CN201410852700.3A
Authority: CN
Inventors: 张瀚文; 李自攀; 张玉军; 王奕; 王煜炜
Original assignee: Institute of Computing Technology of CAS
Current assignee: Chongshi Communication Technology (Beijing) Co., Ltd.
Priority date: 2013-12-31
Filing date: 2014-12-31
Publication date: 2015-06-24
Anticipated expiration: 2034-12-31

Abstract

The invention provides a route optimization method on an MIPv6-PMIPv6 interaction scene. The method comprises the steps that the type of a sub-scene of data flow passing through the local is checked through HA/LMA; according to the scene, checked by the HA/LMA, of the sub-scene, the HA/LMA sends local optimized route initialization messages carrying the type of the sub-scene and an optimization scheme to AR/MAG and MN; the AR/MAG and the MN build respective local optimized routes according to the received local optimized route initialization messages, and all subsequent bidirectional data packets between the MN and CN have no triangular route. On the premise of guaranteeing normal bidirectional communication between the MN and the CN on the MIPv6-PMIPv6 interaction scene B, the performance of the data flow between the MN and the CN on delay and the packet loss probability can be improved, and the data size between an access network and a core network can be reduced.

Description

Routing optimization method under MIPv6-PMIPv6 interaction scenarios

Technical field

The present invention relates to network communication technology field, specifically, the present invention relates to the routing optimization method under a kind of MIPv6-PMIPv6 interaction scenarios.

Background technology

Mobile Internet is the developing direction of future network, its basic architecture is that all-IP CN adds multiple Wireless/wired access network, form the network environment of ubiquitous isomery, user can extensively movement in the world, select different modes access network in different location, enjoy the multiple business such as voice, packet, real-time multimedia.Under this ubiquitous heterogeneous network environment, the addressability of user between different access networks in moving process and conversation continuity be maintained, just must design effective mobile management technology.

Mobile IP v 6 (Mobile IPv6, MIPv6) agreement (IETF RFC3775) and proxy mobile IPv 6 (Proxy Mobile IPv6, PMIPv6) agreement (IETF RFC4831) are the IP layer Mobility Management Schemes that IETF provides for Next Generation Internet.At present, the multiple communication technology standards such as 3GPP SAE, WiMAX have been determined to adopt MIPv6 and PMIPv6 as its Mobility Management Scheme, realize the mobile roaming of user between heterogeneous network.IP mobile management technology in conjunction with MIPv6 and PMIPv6 is just obtaining the extensive concern of academia, standardization body and industry, is counted as in Next Generation Internet the one preferred technique scheme realizing terminal mobility and support.

In real network is disposed, a lot of scene needs the mutual use of PMIPv6 and MIPv6, and it is well-known, the Mobility Management Scheme of PMIPv6 and MIPv6 is different, although current Mobility Management Scheme can complete mutual between terminal (can represent with CN) and the terminal (can represent with MN) belonging to MIPv6 belonging to PMIPv6, still have much room for improvement in delay and packet loss.

Summary of the invention

Therefore, task of the present invention is to provide and a kind ofly under MIPv6-PMIPv6 interaction scenarios ensures the prerequisite of the normal two-way communication between MN and CN, can promotes the solution of the data flow between MN and CN in the performance postponed and in packet loss.

The invention provides the routing optimization method under a kind of MIPv6-PMIPv6 interaction scenarios, wherein, MIPv6-PMIPv6 network residing for described MIPv6-PMIPv6 interaction scenarios comprises both can as the couple in router in MIPv6 territory, again can as the entity of the Mobile Access Gateway in PMIPv6 territory: AR/MAG, and both can as the home agent in MIPv6 territory, again can as the entity of the region mobile anchor point in PMIPv6 territory: HA/LMA;

Routing optimization method under described MIPv6-PMIPv6 interaction scenarios comprises the following steps:

1) HA/LMA checks the data flow under whether local data flow is MIPv6-PMIPv6 interaction scenarios B subfield scape one or subfield scape two, if the judgment is Yes, enter step 2), otherwise, repeated execution of steps 1) continue to check next data flow through local; Described subfield scape one is: MN and CN is attached to same AR/MAG and the current ink of MN attachment is its home link, and described subfield scape two is: the current ink that MN and CN is attached to same AR/MAG, MN attachment is foreign link;

2) HA/LMA notifies that the route of AR/MAG to current data stream is optimized;

3) route of described AR/MAG to current data stream is optimized, and makes all bi-directional data bags between follow-up MN and CN of current data stream no longer forward described HA/LMA, but is directly forwarded to destination node.Wherein the terminal node of MIPv6 is supported in MN representative, and the terminal node of MIPv6 is not supported in CN representative.

Wherein, described step 2) also comprise: if current data stream is the data flow of MIPv6-PMIPv6 interaction scenarios B subfield scape one, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG.

Wherein, described step 3) also comprise: described AR/MAG sets up local route optimization according to received local route optimization initial message, the routing table of priority higher than AR of local route optimization and the Binding Update list of MAG, make packet two-way between follow-up all MN and CN all be forwarded directly to destination node when reaching AR/MAG by local route optimization.

Wherein, described step 2) also comprise: if current data stream is the data flow of MIPv6-PMIPv6 interaction scenarios B subfield scape two, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG and MN.

Wherein, described step 3) comprise substep:

31) after receiving local route optimization initial message, described MN and described AR/MAG are through consulting to be set up bidirectional tunneling mode between MN with CN to communicate;

32) described AR/MAG sets up local route optimization according to received local route optimization initial message;

33) set up the bidirectional tunnel between described MN and described AR/MAG, based on set up bidirectional tunnel, make all bi-directional data bags between follow-up MN and CN of current data stream no longer forward described HA/LMA, but be directly forwarded to destination node.

Wherein, described step 33) also comprise:

Described bidirectional tunnel makes: MN mails to the packet of CN, internal layer object and source address are respectively CN-Addr, MN-HoA, the outer object of tunnel encapsulation and source address are respectively AR/MAG-Addr, MN-CoA, when AR/MAG receives this packet, after decapsulation, directly packet is forwarded to CN by according to the local route optimization set up for MN, CN;

CN mails to the packet of MN, object and source address are respectively MN-HoA, CN-Addr, after packet to AR/MAG, according to the local route optimization set up for MN, CN, packet is encapsulated, outer object after encapsulation and source address are respectively MN-CoA, AR/MAG-Addr, after encapsulation, directly packet are forwarded to MN by MN-AR/MAG tunnel.

Wherein, described step 2) also comprise: if current data stream is the data flow of MIPv6-PMIPv6 interaction scenarios B subfield scape two, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG.

Wherein, described step 3) comprise substep:

31) described AR/MAG sets up local route optimization according to received local route optimization initial message, and forwards local route optimization initial message to MN;

32) described MN sets up local route optimization according to received local route optimization initial message;

33) make after described AR/MAG and described MN sets up local route optimization separately: all bi-directional data bags between MN and CN that current data stream is follow-up no longer forward described HA/LMA, but are directly forwarded to destination node.

Wherein, described step 33) also comprise:

Make after described AR/MAG and described MN sets up local route optimization separately:

MN mails to the packet of CN, object and source address are respectively CN-Addr, MN-HoA, and this packet is directly sent to AR/MAG from MN, and is no longer sent to HA/LMA, when AR/MAG receives this packet, packet is directly forwarded to CN by the local route optimization according to setting up for MN, CN;

CN mails to the packet of MN, and object and source address are respectively MN-HoA, CN-Addr.After packet to AR/MAG, according to the local route optimization set up for MN, CN, directly packet is forwarded to MN.

Wherein, described step 1) before, terminal node sends to AR/MAG and carries the router request message whether this terminal node supports the ICMPv6 protocol definition of the expansion of MIPv6 protocol information, according to the router request message of the ICMPv6 protocol definition of received expansion, described AR/MAG differentiates that this terminal node is MN or CN.

Present invention also offers the routing optimization method under another kind of MIPv6-PMIPv6 interaction scenarios, comprise the following steps:

1) HA/LMA checks whether through local data flow be MIPv6-PMIPv6 interaction scenarios B subfield scape data flow once, and described subfield scape one is: MN and CN is attached to same AR/MAG and the current ink of MN attachment is its home link;

2) when HA/LMA detects described subfield scape data flow once, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG;

3) AR/MAG sets up local route optimization according to received local route optimization initial message, the routing table of priority higher than AR of local route optimization and the Binding Update list of MAG, make packet two-way between follow-up all MN and CN all be forwarded directly to destination node when reaching AR/MAG by local route optimization.

Wherein, described step 1) before, terminal node sends the router request message of the ICMPv6 protocol definition of expansion to AR/MAG, carry the information whether this terminal node supports MIPv6 agreement in the router solicitation of the ICMPv6 protocol definition of described expansion.

1) HA/LMA checks that whether through local data flow be the data flow under MIPv6-PMIPv6 interaction scenarios B subfield scape two, and described subfield scape two is: the current ink that MN and CN is attached to same AR/MAG, MN attachment is foreign link;

2) when HA/LMA detects the data flow under described subfield scape two, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG and MN;

3) MN with AR/MAG is through consulting to be set up bidirectional tunneling mode between MN with CN to communicate;

4) AR/MAG sets up local route optimization according to received local route optimization initial message;

5) foundation of the bidirectional tunnel between MN and AR/MAG, makes: MN mails to the packet of CN, and internal layer object and source address are respectively CN-Addr, MN-HoA, and the outer object of tunnel encapsulation and source address are respectively AR/MAG-Addr, MN-CoA.When AR/MAG receives this packet, after decapsulation, directly packet is forwarded to CN by according to the local route optimization set up for MN, CN;

CN mails to the packet of MN, and object and source address are respectively MN-HoA, CN-Addr.After packet to AR/MAG, according to the local route optimization set up for MN, CN, encapsulate packet, the outer object after encapsulation and source address are respectively MN-CoA, AR/MAG-Addr, after encapsulation, directly packet is forwarded to MN by MN-AR/MAG tunnel.

Present invention also offers the routing optimization method under another MIPv6-PMIPv6 interaction scenarios, comprise the following steps: 1) HA/LMA check through local data flow be whether the data flow under MIPv6-PMIPv6 interaction scenarios B subfield scape two, described subfield scape two is: the current ink that MN and CN is attached to same AR/MAG, MN attachment is foreign link;

2) when HA/LMA detects the data flow under described subfield scape two, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG;

3) AR/MAG sets up local route optimization according to received local route optimization initial message, and forwards local route optimization initial message to MN;

4) MN sets up local route optimization according to received local route optimization initial message;

Described AR/MAG and MN makes after setting up local route optimization separately: MN mails to the packet of CN, object and source address are respectively CN-Addr, MN-HoA, this packet directly will be sent to AR/MAG from MN, and HA is no longer sent to through MN-HA tunnel, when AR/MAG receives this packet, packet is directly forwarded to CN by the local route optimization according to setting up for MN, CN;

Wherein, MN and AR/MAG is after setting up local route optimization, and the follow-up communication of MN and CN encapsulates not re-using current address MN-CoA packet, and directly uses home address MN-CoA and the CN of MN to communicate.

Wherein, in the LORI message sent in HA/LMA, be provided with scene type field " S " and prioritization scheme type field " M ", the route optimization process that instruction AR/MAG and MN triggers scene is corresponding.

Compared with prior art, the present invention has following technique effect:

1, under the present invention can ensure the prerequisite of the normal two-way communication between MN and CN under MIPv6-PMIPv6 interaction scenarios B, the performance of data flow in delay and packet loss between MN and CN is promoted.

2, the present invention can reduce the data volume between Access Network and core net, thus alleviates excessive the caused network bottleneck effect of transmitted data amount between Access Network and core net.

Accompanying drawing explanation

Below, describe embodiments of the invention in detail by reference to the accompanying drawings, wherein:

Fig. 1 shows the network architecture schematic diagram of MIPv6;

Fig. 2 shows the network architecture schematic diagram of PMIPv6;

Fig. 3 shows the schematic diagram of MIPv6-PMIPv6 interaction scenarios B;

Fig. 4 shows the schematic diagram of the Triangle routing problem under MIPv6-PMIPv6 interaction scenarios B;

Fig. 5 shows the data packet transmission sequential chart of subfield scape once between MN and CN of one embodiment of the invention;

Fig. 6 shows the data packet transmission sequential chart between subfield scape two times MN and CN of one embodiment of the invention;

Fig. 7 shows the time diagram of the MIPv6-PMIPv6 interaction scenarios B routing optimality of one embodiment of the invention;

Fig. 8 shows the router request message form in one embodiment of the invention after expansion;

Fig. 9 shows MIPv6-PMIPv6 interaction scenarios B subfield scape routing optimality sequential chart once in one embodiment of the invention;

Figure 10 shows the LORI message format in one embodiment of the invention;

Figure 11 shows the LORA message format in one embodiment of the invention;

Figure 12 shows the sequential chart of the routing optimality scheme one under the MIPv6-PMIPv6 interaction scenarios B subfield scape two in one embodiment of the invention;

Figure 13 shows the sequential chart of the routing optimality scheme two under the MIPv6-PMIPv6 interaction scenarios B subfield scape two in one embodiment of the invention;

Figure 14 shows the sequential chart that the present invention one MIPv6-PMIPv6 interaction scenarios B subfield scape route optimization once had under application scenarios cancels (HA/LMA initiation);

Figure 15 shows the sequential chart that the present invention one MIPv6-PMIPv6 interaction scenarios B subfield scape route optimization once had under application scenarios cancels (AR/MAG initiation);

Figure 16 show the present invention one there is application scenarios under MIPv6-PMIPv6 interaction scenarios B subfield scape two under route optimization cancel the sequential chart of (HA/LMA initiation).

Embodiment

The present invention needs to use some rudimentary knowledge relating to MIPv6 and PMIPv6, for the ease of understanding, hereinafter dividing three parts to do the present invention and describing further.Wherein, Part I is: the brief introduction of MIPv6 and PMIPv6 network; Part II is: the interaction scenarios of PMIPv6 and MIPv6 and the proposition of Triangle routing problem; Part III is: for the routing optimization method of proposed Triangle routing problem.

One, MIPv6 and PMIPv6 network brief introduction

Fig. 1 shows the network architecture schematic diagram of MIPv6, and convenient in order to describe, first composition graphs 1 introduces the basic terms in MIPv6:

1) mobile node (Mobile Node, MN): can from a link moving to another link, and the node of the IP address can continued with original and other node communication.Mobile node can be the node supported locomotive function and itself might not be moved.Node A is exactly a mobile node.

2) communication node (Correspondent Node, CN): the node communicated with a mobile node.Communication node can be stationary nodes, also can be mobile node.Node B is exactly the communication node of Node A.

3) home address ((Home-of Address, HoA): the address had when mobile node is not moved.Address A1 when Node A is not moved is exactly the home address of Node A.

4) home sub-net prefix (home subnet prefix): with the subnet prefix corresponding to the home address of mobile node.Subnet prefix on the link Link 0 at Node A place is exactly the home sub-net prefix of Node A.

5) home link (Home Link, HL): the link defined by moving nodes local subnet prefix.Prefix routing mechanism can be routed to the packet mailing to address, a moving nodes local on its home link, and Link 0 is exactly the home link of Node A.

6) foreign subnet prefix (foreign subnet prefix): concerning a mobile node, any prefix except home sub-net prefix is all called foreign subnet prefix.Usually said foreign subnet prefix refers to the subnet prefix of mobile node just in access link.

7) foreign link (Foreign Link, FL): any link except the link of moving nodes local is all called foreign link.Link 1 is exactly a foreign link for Node A.

8) home agent (Home Agent, HA): home agent is a router on the link of moving nodes local, and it is the mobile anchor point of MN, maintains the accessibility in MN moving process.It mainly bears the function of two aspects: for MN safeguards the corresponding relation of its home address and Care-of Address; Intercept and capture the bag mailing to address, moving nodes local, and by tunnel style, packet is forwarded to the new address of mobile node.

9) Care-of Address (Care-of Address, CoA): the address matched with foreign subnet prefix formed when mobile node is connected to foreign link.A mobile node can have multiple Care-of Address simultaneously.The address A2 that Node A obtains after arriving Link 1 is exactly the Care-of Address of Node A.

In mipv 6, four important entities are defined: mobile node (MN), home agent (HA), communication node (CN) and access router (AR).Wherein each MN has two addresses: home address HoA and Care-of Address CoA.MN uses a unique HoA (identify label remains constant in moving process) can be connected on any link; Simultaneously whenever MN moves to a new subnet, it just obtains a new interim CoA (station location marker, constantly change in moving process) from AR, and it is registered to HA.HA is the router safeguarding that HoA and CoA maps specially.CN is inquired about to HA by the HoA of MN, just can obtain the CoA address that MN is current, thus makes CN grouping can be sent to MN.

Two kinds of patterns can be adopted between MN and CN to communicate.

Bidirectional tunneling mode: this mode does not need the support of CN, MN does not need to register its current address information to CN yet.The packet mailing to MN by CN is routed to the home link of MN, and then packet is forwarded to the current care of address (CoA) of MN by HA by tunnel; The packet being sent to CN by MN then passes to HA by reverse tunnel, then is routed to CN by conventional mode.In this mode, HA intercepts any packet to MN home address, then through encapsulation, re-sends to the current C oA of MN.

Route optimization mode: this mode requires that MN registers its current address on CN, and the packet from CN is routed directly to the current C oA of MN.This mode can without HA directly by Packet Generation to MN, thus decrease the HA of MN and the burden of home link, decrease the impact because failure on HA or path causes.

MIPv6 agreement needs the support of user terminal MN.But reality is that the protocol stack of many terminals does not support MIPv6.For this reason, the network mobility management protocol PMIPV6 of ietf definition.PMIPV6 agreement is expanded based on MIPV6 agreement, its object is to realize without the need to MN participate in, network IP mobile management.

Fig. 2 shows the network architecture schematic diagram of PMIPv6.Below, composition graphs 2 introduces the basic terms in PMIPv6:

1) PMIPv6 territory (PMIPv6-Domain): use PMIPv6 to realize the network of MN mobile management, the region that region mobile anchor point (LMA) covers is a PMIP territory.A PMIPV6 territory comprises one or more regions mobile anchor point and multiple Mobile Access Gateway.

2) region mobile anchor point (Local Mobile Anchor, LMA): effect is the equal of the HA in local PMIPv6 territory, it is the topology anchor point of all MN home network prefix (MN-HNP) in local domain, be in charge of the binding information of MN in territory, maintain the accessibility of MN.

3) Mobile Access Gateway (Mobile Access Gateway, MAG): usually dispose on the access router, its effect detects the movement of MN between access link, and carry out binding registration as the agency of MN to LMA, for MN simulates home link, be MN forwarding data by MAG-LMA bidirectional tunnel

4) LMA address (LMA Address, LMAA): the global address of LMA interface configuration, the end points of MAG-LMA bidirectional tunnel.

5) Agent care-of address (Proxy CoA, PCoA): the global address of MAG interface configuration, the end points of MAG-LMA bidirectional tunnel.LMA using the PCoA of this address as MN, for MN registers this address in banding cache (PBCE).

6) MN home network prefix (MN Home Network Prefix, MN-HNP): the prefix of distributing for the virtual point point-to-point link between MN and MAG, MN is the one or more address of interface configuration of oneself according to MN-HNP.Link between certain MN and MAG can distribute multiple MN-HNP, and these prefixes are as the prefix set of same mobile session (mobility session).If MN is linked into PMIPv6 territory by multiple interface simultaneously, each interface, by being assigned with one group of unique MN-HNP, distributes to all MN-HNP of a certain interface by a mobile session management.

7) MN home address (MN-HoA): configured the MN address obtained by MN-HNP.As long as the access network access of MN in same PMIPv6 territory, can use this address.If MN is configured with multiple address by its multiple MN-HNP, any one can as its MN-HoA.In MIPv6, HA knows the HoA of MN; Be different from MIPv6, in PMIPv6, relevant mobile management entity only knows the MN-HNP of MN, and does not know its MN-HoA.Certainly, some address configuration pattern may make mobile management entity know the MN-HoA that MN configures.

8) MN home link (MN-HL): network is the virtual home link that each MN simulates, and MN moves to after in a PMIPv6 territory, obtains three layer address configurations of access interface from this link.MN will be assigned to exclusive MN-HNP after accessing PMIPv6 territory.MN is in territory during the access of any access link, and the MAG of place link will by declare its MN-HNP in router advertisement message to this MN, the home link of simulation MN, always its MN-HL that MN is seen on three-layer network configures.The different access link in whole PMIPv6 territory are all rendered as its home link to MN, and when MN is moved between any link in territory, all perception, less than three layers of movement, reaches to the mobile management of MN completely by real-time performance, without the need to the object that MN participates in this.

The mobile management entity that PMIPv6 introduces two types realizes system service: region mobile anchor point (LMA) and Mobile Access Gateway (MAG).A PMIPv6 territory comprises one or more LMA and multiple MAG.LMA is equivalent to the HA in PMIPv6 territory, and it is the topology anchor point of all MN-HNP in territory, is in charge of the binding information of MN, and maintain the accessibility of MN, LMA has HA function in MIPv6 agreement, and the additional function required by PMIPv6 agreement; MAG disposes on the access router usually, is responsible for detecting the movement of MN between access link, and the agency as MN carries out binding registration to LMA, by declaring that to MN MN-HNP is that MN simulates home link, and is MN forwarding data by MAG-LMA bidirectional tunnel.Because the mobility management protocol function of MN has been acted on behalf of by the MAG in network, therefore claiming this agreement to be the region that proxy-mobile IP (PMIP), LMA cover is a PMIPv6 territory.

When MN initially accesses, MAG can know unique MN mark (being generally two layers of mark of MN, such as MAC Address) identifying mobile node by access authentication procedure, then represents MN and registers to LMA, with MN mark and MAG address in registration message.After LMA receives registration message, for MN distributes one or more home network prefix (MN-HNP), and inform MAG by registration confirmation message.Latter informs MN by router advertisement message, and MN configures its home address (MN-HoA) accordingly automatically.LMA sets up the bidirectional tunnel between the binding of MN-HNP and corresponding MAG address and LMA-MAG by registration process, and MAG address is considered as the PCoA of the MN that this MAG acts on behalf of by LMA.In PMIP territory, the MN-HNP that each MN distributes is not identical, and the route anchor point of all MN-HNP is LMA, and all destination address prefixes are that the packet of MN-HNP all will route to LMA, then be transmitted to the MAG of binding by LMA by tunnel, finally by MAG, packet be transmitted to MN.The packet that MN sends then delivers LMA by reverse tunnel by MAG, then is forwarded by the latter.

When MN migrates to new MAG from original MAG in PMIP territory, the latter initiates new registration by LMA, upgrades the binding in LMA.Because MN mark is changeless, the MN-HNP that therefore LMA distributes also remains unchanged, new MAG by by declaring that to MN same MN-HNP simulates its home network, so MN on three layers by perception less than there occurs movement.Therefore utilize PMIPv6, network also can provide Mobile IP service for the terminal not possessing MIP protocol function.

Two, the interaction scenarios of PMIPv6 and MIPv6 and the proposition of Triangle routing problem

In real network is disposed, a lot of scene needs the mutual use of PMIPv6 and MIPv6, and IETF RFC6612 (Interactions between Proxy Mobile IPv6 (PMIPv6) and Mobile IPv6 (MIPv6): Scenarios and Related Issues) has exactly defined three kinds of typical scenes that MIPv6-PMIPv6 uses alternately:

1) MIPv6-PMIPv6 interaction scenarios A.1: the MIPv6-PMIPv6 interaction scenarios of hierarchical structure;

2) MIPv6-PMIPv6 interaction scenarios A.2:MIPv6-PMIPv6 shift scene;

3) MIPv6-PMIPv6 interaction scenarios B:MIPv6-PMIPv6 coexists in consolidated network.

Wherein, MIPv6-PMIPv6 interaction scenarios B as shown in Figure 3.Under this scene, two nodes intercomed mutually, adopt different mobile managements respectively, and wherein MN supports MIPv6; And the CN communicated with MN, as common IPv6 main frame (IPv6Host), do not support MIPv6, can only rely on the network mobile management service that network provides, namely CN realizes mobile management by PMIPv6.

The mobile anchor point of MN and CN is same entity, the HA/LMA namely in Fig. 3, and this entity is HA for MN, is LMA for CN (this document further part, if without specializing, CN all refers to not support the IPv6Host of MIPv6).When entity HA/LMA receives packet, if the IPv6Host that the destination address of packet is LMA serves, then search the MAG accompanying by this IPv6Host, by LMA-MAG bidirectional tunnel, packet is forwarded to MAG, then is forwarded to IPv6Host by MAG; Otherwise, carry out normal route by the destination address of packet.Hereinafter, HA, LMA all refer to respectively for the logical network entity of MN, CN, and these two logic entities are Same Physical entity HA/LMA.

Entity A R/MAG is only common couple in router (AR) for MN, needs the topological prefix declaring AR/MAG oneself to MN; And AR/MAG needs the function providing MAG for CN, be namely required to be CN and simulate home link, one or more MN-HNP of being assigned to from LMA of declaration CN, and act on behalf of CN when CN is moved and carry out moving registration to LMA.When entity A R/MAG receives packet, if the address of the IPv6Host that the source address of packet is MAG to be acted on behalf of, then by LMA-MAG bidirectional tunnel, packet is forwarded to LMA, then has LMA to carry out normal route to packet; Otherwise, carry out normal route by the destination address of packet.Hereinafter, AR, MAG all refer to respectively for the logical network entity of MN, CN, and these two logic entities are Same Physical entity A R/MAG.

For ease of understanding, further the Triangle routing problem under MIPv6-PMIPv6 interaction scenarios B is analysed in depth below.

Under MIPv6-PMIPv6 interaction scenarios B, because CN does not support MIPv6, MN cannot carry out MIPv6 routing optimality, and bidirectional tunneling mode can only be adopted to communicate with CN, and the packet namely sending or issue MN from MN all needs to be forwarded by HA.And CN is as common IPv6Host, the PMIPv6 that depending on network provides realizes mobile management, sends or issue the packet of CN from CN, all needs the bidirectional tunnel between the LMA that registered by the current accompanying MAG of CN and it to forward.Therefore, between MN and CN, the transmission path of packet is: be attached on same AR/MAG even if MN and CN is current, and its mobile anchor point is same entity (i.e. HA _mNand LMA _cNsame entity HA/LMA), as shown in Figure 4, the path between them is still formed between the Triangle routing of data packet transmission.

HA/LMA is often positioned at core net, on the topology away from MN and CN.Packet between MN and CN carries out twice unnecessary forwarding by link between AR/MAG and HA/LMA, not only increases the transmission delay of packet, too increases between the data volume of link, also will increase the data volume between Access Network and core net, and the bottleneck of transmission network between Access Network and core expense and performance often.

Although IETF has formulated respectively for the routing optimality scheme (RFC3775, RFC6705) of MIPv6 and PMIPv6, all MIPv6-PMIPv6 interaction scenarios B cannot be directly applied to.As mentioned before, when CN does not support MIPv6, MN cannot carry out MIPv6 routing optimality at all.And PMIPv6 routing optimality scheme only can solve the Triangle routing problem in PMIPv6 territory, MIPv6-PMIPv6 interaction scenarios B can not be directly applied to.

Three, for the routing optimization method of proposed Triangle routing problem

For the Triangle routing problem under MIPv6-PMIPv6 interaction scenarios B, the present invention proposes a kind of routing optimization method, it can improve the performance of data flow in delay and packet loss between MN and CN, reduce the flow of link between network entity AR/MAG and HA/LMA simultaneously, namely decrease data volume between Access Network and the core net bottleneck of expense and performance (transmission network between Access Network and core often), thus improve network performance.

Triangle routing problem under solution MIPv6-PMIPv6 interaction scenarios B, needs to consider following two sub-scenes:

1) subfield scape one: MN and CN are attached to same AR/MAG and the current ink of MN attachment is its home link.

Under this scene, MN uses its home address (being hereinafter expressed as MN-HoA) to carry out communicate (address of CN is expressed as CN-Addr) with CN.Data packet transmission between MN and CN as shown in Figure 5.

MN mails to the packet of CN, and destination address is CN-Addr, and source address is MN-HoA.Packet sends from MN, after arriving AR (i.e. entity A R/MAG), the route anchor point LMA (i.e. entity HA/LMA) of CN will be forwarded to, packet is forwarded back to entity A R/MAG by the bidirectional tunnel by setting up with MAG by LMA, by MAG (i.e. entity A R/MAG), this packet is transmitted to CN.Namely the forward-path of packet is: MN → AR/MAG → HA/LMA → AR/MAG → MN.

CN mails to the packet of MN, and destination address is MN-HoA, and source address is CN-Addr.Because source address is CN-Addr, after packet arrives MAG (i.e. entity A R/MAG), LMA will be forwarded to through LMA-MAG tunnel, again by LMA according to the destination address MN-HoA routing forwarding of packet to MN, namely the forward-path of packet is: CN → AR/MAG → HA/LMA → AR/MAG → MN.

2) subfield scape two: MN and CN are attached to the current ink of same AR/MAG, MN attachment is foreign link.

Under this scene, MN uses its Care-of Address (being hereinafter expressed as MN-CoA) to carry out communicate (CN address is expressed as CN-Addr) with CN.When MN is in foreign link, HA is as the route anchor point of MN, and the packet that MN sent and mail to MN all needs the tunnel through between MN-HA to forward.Data packet transmission between MN and CN as shown in Figure 6.

MN mails to the packet of CN, and internal layer destination address is CN-Addr, and source address is MN-HoA; Outer destination address after encapsulation is the address (HA-Addr) of HA, and source address is MN-CoA.Packet through MN-HA tunnel to HA (i.e. entity HA/LMA), HA/LMA is to after packet decapsulation, according to internal layer destination address CN-Addr, by by the tunnel between LMA-MAG, this packet is forwarded to MAG (i.e. entity A R/MAG), then is transmitted to CN by MAG.The forward-path of packet is: MN → AR/MAG → HA/LMA → AR/MAG → CN.

CN mails to the packet of MN, destination address is MN-HoA, source address is CN-Addr, after packet arrives MAG (i.e. entity A R/MAG), to be forwarded to LMA (i.e. entity HA/LMA) by tunnel, HA carries out tunnel encapsulation to packet, and the outer layer destination address after encapsulation is MN-CoA, source address is HA-Addr, and data are forwarded to MN through HA-MN tunnel.Therefore the forward-path of packet is: CN → AR/MAG → HA/LMA → AR/MAG → MN.

In addition, under MIPv6-PMIPv6 interaction scenarios B, require that AR/MAG can the type of distinguishing terminal node, namely judge that terminal node is the MN supporting MIPv6 agreement, or common IPv6Host.Like this, AR/MAG could declare different prefixes to dissimilar node, and carries out correct forwarding to the packet arriving AR/MAG.

Below, the present invention is done in conjunction with the embodiments and describe further.

According to one embodiment of present invention, propose a kind of routing optimality scheme of the Triangle routing problem solved under MIPv6-PMIPv6 interaction scenarios B, as shown in Figure 7, comprise terminal node attachment and routing optimality two parts.

(1) terminal node attachment

The router request message (Router Solicitation, RS) of expansion ICMPv6 protocol definition, makes terminal node can notice it to entity A R/MAG and whether supports MIPv6 agreement.MIPv6_support_flag position is set to, as " M " in Fig. 8 by first of reserved field in RS.Support that the terminal of MIPv6 is by the MIPv6_support_flag position 1 of RS message; Do not support that the terminal of MIPv6 does not need to change, the reserved field acquiescence in RS message sets to 0.AR/MAG receives the RS message that terminal sends, can judge whether this terminal supports MIPv6 according to MIPv6_support_flag: for the terminal supporting MIPv6, router advertisement message (Router Advertisement is replied directly to it, RA), and declaring the network prefix of AR/MAG oneself, MN carries out MIPv6 registration to HA after completing address configuration; For the ordinary node not supporting MIPv6, AR/MAG acts on behalf of this node and carries out PMIPv6 registration to LMA, and after having registered, to this terminal replies RA message, declaration LMA is the network prefix of this terminal distribution.

(2) routing optimality

Routing optimality comprises the routing optimality under MIPv6-PMIPv6 interaction scenarios B subfield scape routing optimality once and MIPv6-PMIPv6 interaction scenarios B subfield scape two, and the routing optimality wherein under MIPv6-PMIPv6 interaction scenarios B subfield scape two comprises again two kinds of different schemes.Whether HA/LMA according to the source of forwarded packet, destination address, can encapsulate, and the information such as source, destination address being encapsulated into internal layer judges concrete scene, triggers corresponding route optimization process.

(1) MIPv6-PMIPv6 interaction scenarios B subfield scape route optimization process once

As shown in Figure 9, step is as follows for subfield scape route optimization process once:

1) HA/LMA sends local route optimization initial message (Localized Optimized Routing Initiation, LORI) to AR/MAG and initiates route optimization process.LORI message uses new moving-head type, and as shown in Figure 10, wherein the implication of each several part is as follows for message format:

Sequence number: monotonic increase integer, is arranged by sending node, for mating the response message of this request.

This flag bit of Scenario (S) flag bit: HA/LMA indicates current sub-scene type, sets to 0, is subfield scape one; Put 1, be subfield scape two.

The routing optimality scheme that Method (M) flag bit: HA/LMA adopts for two times by this flag bit instruction scene, sets to 0, instruction employing scheme one; Put 1, instruction employing scheme two.This flag bit only " S " position 1 time effective.

Retain position: for subsequent expansion, every position 0.

Lifetime: the local routing effective time of sender's request, in seconds.When being set to the lifetime of xffff (complete 1) expression endless; When being set to 0, representing and stopping local routing.

Mobile option: the network prefix option (CN-HNP, one or more, at least one) comprising the HoA option (MN-HoA) of MN, the identification options (CN-ID) of CN, CN.MN-HoA choice format follows " Home Address " option defined in RFC3775, and CN-ID option and CN-HNP choice format follow " MN-ID " and " HNP " option defined in RFC5213 respectively.

If do not receive corresponding LORA message within LORA_WAIT_TIME unit interval, then LORI retransmitting message, until number of retransmissions is maximum LORI_RETRIES.

2) the LORI message that receives of AR/MAG process

After AR/MAG receives LORI message, first determine the attachment state of MN and CN, if wherein any one is currently no longer attached to this AR/MAG, then replys LORA message to HA/LMA immediately, and indicate " terminal node does not connect ".

AR/MAG also needs to check local configuration, determines whether to allow to carry out optimizing local routing, if do not allow, then replys LORA message to HA/LMA immediately, and indicates " optimizing local routing request is not allowed to ".

If AR/MAG is configured to allow to carry out optimizing local routing, MN and CN then for indicating in LORI message sets up two-way local route optimization option (Localized Optimized Route Entry, LORE): in option, record down hop mark (L2 address as MN) that MN-HoA is corresponding respectively, the down hop mark that CN-HNP (one or more) is corresponding.The routing table of priority higher than AR of LORE and Binding Update list (the Binding Update List of MAG, BUL, MAG BUL records MAG-LMA tunnel corresponding to each terminal network prefix), therefore follow-up data flow that is all and MN-HoA and CN-HNP coupling all can forward according to the local routing after optimization.

3), after successfully setting up local route optimization, AR/MAG is LORA (the Localized Optimized Routing Acknowledge) message of " 0 " to HA/LMA recoil state code.As shown in figure 11, wherein the implication of each several part is as follows for LORA message format:

Sequence number: for mating LORI message, copies from the sequence-number field corresponding LORI message.

Unsolicited (U) flag: if be set to 1, indicates this LRA message to be the LORA message of not requested the response of certain LORI message (be not corresponding).Such as when AR/MAG wishes to cancel certain route optimization, initiatively will send not requested LORA message to HA/LMA, and will set to 0 the lifetime, this route optimization is cancelled in instruction.

Retain position: for subsequent expansion, every position 0.

Conditional code: 8, without symbol shaping, indicate the result of optimizing local routing request message.If value is less than 128, then represent that optimizing local routing request has been successfully processed; If value is more than or equal to 128, then represent that local route request has been rejected.Defined state value comprises: 0, and route optimization is successfully established; 1, allow to set up route optimization; 128, optimizing local routing is not allowed to; 129, terminal node does not connect; 130, MA-AR/MAG sets up unsuccessfully in tunnel.When the conditional code in LORA message is set to 0, HA/LMA is after receiving this LORA message, and banding cache item (BCE) place corresponding at corresponding MN-HoA and CN-HNP arranges mark, represents that corresponding local route optimization runs.

Lifetime: the time that local route optimization is supported, in seconds.

Mobile option: if state value is 0, MN-HoA, CN-ID and CN-HNP (one or more) that the route optimization that mobile option comprises success foundation relates to.If establish the unidirectional path optimizing of CN to MN than only, then only comprise MN-HoA option.

4) HA/LMA process LORA message

HA/LMA is after receiving conditional code and being set to the LORA message of " 0 ", and banding cache item (BCE) place corresponding at corresponding MN-HoA and CN-HNP arranges mark, represents that corresponding local route optimization runs.After routing optimality completes, the two-way packet of MN-CN all will be forwarded directly to destination node when reaching AR/MAG first by local route optimization.

(2) route optimization process one (scheme one) under MIPv6-PMIPv6 interaction scenarios B subfield scape two

As shown in figure 12, step is as follows for route optimization process one under subfield scape two:

1) HA/LMA sends local route optimization initial message (LORI) to AR/MAG and initiates route optimization process.

This subfield scape, " S " mark position 1 of LORI message.

" M " mark position 0 of LORI message, instruction employing scheme one.

Mobile option: comprise following option according to the order of sequence: MN-HoA, MN-CoA, CN-ID, CN-HNP (one or more, at least one).

2) the LORI message that receives of AR/MAG process

After AR/MAG receives LORI message, first determine the attachment state of MN and CN, if wherein any one is currently no longer attached to this AR/MAG, then immediately to the LORA message that HA/LMA recoil state code is " 129 ", instruction " terminal node does not connect ".

AR/MAG also checks local configuration, determines whether to allow to carry out optimizing local routing, if do not allow, then immediately to the LORA message that HA/LMA recoil state code is " 128 ", and instruction " optimizing local routing request is not allowed to ".

If AR/MAG is configured to allow to carry out optimizing local routing, then forward LORI message to MN.

AR/MAG receives the LORA message that MN replys, and the conditional code of message is " 128 " (optimizing local routing is not allowed to), then immediately to the LORA message that HA/LMA recoil state code is " 128 ", instruction " optimizing local routing request is not allowed to ".

AR/MAG receives the LORA message that MN replys, and the conditional code of message is " 1 " (allowing to set up route optimization), then consult to set up bidirectional tunnel with MN, and two the sending out of MN and AR/MAG all can initiate tunnel negotiation process.The two ends in tunnel are respectively MN-CoA and AR/MAG address (AR/MAG-Addr).If tunnel is set up unsuccessful, then immediately to the LORA message that HA/LMA recoil state code is " 130 ", instruction " MN-AR/MAG sets up unsuccessfully in tunnel ".

After MN-AR/MAG tunnel is successfully established, for MN and CN sets up two-way local bidirectional optimistic route option (LORE): option records the MN-CoA of MN-HoA binding respectively, and the MN-AR/MAG tunnel of correspondence; Down hop mark (L2 address as CN) that CN-HNP is corresponding.The routing table of priority higher than AR of LORE and the Binding Update list of MAG.

After successfully setting up route optimization, AR/MAG is the LORA message of " 0 " to HA/LMA recoil state code.Sequence number, " S " flag bit of the LORA message that AR/MAG replys to HA/LMA should be identical with corresponding LORI message with " M " flag bit.If the state value of LORA message is 0, MN-HoA, MN-CoA, CN-ID and CN-HNP (one or more) that the route optimization that mobile option comprises success foundation according to the order of sequence relates to.

3) the LORI message that receives of MN process

After MN receives the LORI message of AR/MAG forwarding, judging whether that route optimization is set up in support according to this locality configuration or security strategy etc., if support, is then the LORA message of " 1 " (allowing to set up route optimization) to AR/MAG recoil state code; If do not support, be then the LORA message of " 128 " (optimizing local routing is not allowed to) to AR/MAG recoil state code.

Set up route optimization if support, consult to set up bidirectional tunnel with AR/MAG.

After MN-AR/MAG tunnel is successfully established, MN will be established to the route optimization of CN in this locality: correspond to MN-AR/MAG tunnel by CN-HNP, and no longer correspond to MN-HA tunnel.

4) HA/LMA process LORA message

HA/LMA is after receiving conditional code and being set to the LORA message of " 0 ", and banding cache item (BCE) place corresponding at corresponding MN-HoA and CN-HNP arranges mark, represents that corresponding local route optimization runs.

After routing optimality completes, MN mails to the packet of CN, and internal layer object and source address are respectively CN-Addr, MN-HoA, and the outer object of tunnel encapsulation and source address are respectively AR/MAG-Addr, MN-CoA.When AR/MAG receives this packet, after decapsulation, directly packet is forwarded to CN by according to the local route optimization set up for MN, CN.

CN mails to the packet of MN, and object and source address are respectively MN-HoA, CN-Addr.After packet to AR/MAG, according to the local route optimization set up for MN, CN, will encapsulate packet, the outer object after encapsulation and source address are respectively MN-CoA, AR/MAG-Addr.After encapsulation, directly packet will be forwarded to MN by MN-AR/MAG tunnel.

(3) route optimization process two (scheme two) under MIPv6-PMIPv6 interaction scenarios B subfield scape two

As shown in figure 13, step is as follows for route optimization process two under subfield scape two:

This subfield scape, " S " mark position 1 of LORI message.

" M " mark position 1 of LORI message, instruction employing scheme two.

2) the LORI message that receives of AR/MAG process

AR/MAG also needs to check local configuration, determines whether to allow to carry out optimizing local routing, if do not allow, then immediately to the LORA message that HA/LMA recoil state code is " 128 ", and instruction " optimizing local routing request is not allowed to ".

It is the LORA message of " 128 " (optimizing local routing is not allowed to) that AR/MAG receives the conditional code that MN replys, then immediately to the LORA message that HA/LMA recoil state code is " 128 ", indicate " optimizing local routing request is not allowed to ".

It is the LORA message of " 0 " (route optimization is successfully established) that AR/MAG receives the conditional code that MN replys, then set up two-way local bidirectional optimistic route option (LORE) for MN and CN: the down hop of MN-CoA and correspondence thereof that option records MN-HoA binding respectively identifies (L2 address as MN), down hop that CN-HNP is corresponding identifies (L2 address as CN).The routing table of priority higher than AR of LORE and the Binding Update list of MAG.

After successfully setting up local route optimization, AR/MAG is the LORA message of " 0 " to HA/LMA recoil state code.AR/MAG the LORA message of replying to HA/LMA sequence number, " S " flag bit should be identical with corresponding LORI message with " M " flag bit.If the state value of LORA message is 0, MN-HoA, MN-CoA, CN-ID and CN-HNP (one or more) that the route optimization that mobile option comprises success foundation according to the order of sequence relates to.

3) the LORI message that receives of MN process

After MN receives the LORI message of AR/MAG forwarding, judge whether that route optimization is set up in support according to this locality configuration or security strategy etc., if do not support, be then the LORA message of " 128 " (optimizing local routing is not allowed to) to AR/MAG recoil state code.

MN supports to set up route optimization, be then established to the route optimization of CN in this locality, and the packet that mark mails to CN-HNP is directly sent to AR/MAG-Addr, and is no longer forwarded to HA by tunnel.

After MN is established to the route optimization of CN-HNP, be the LORA message of " 0 " to AR/MAG recoil state code.

4) HA/LMA process LORA message

After routing optimality completes, MN mails to the packet of CN, and object and source address are respectively CN-Addr, MN-HoA, and this packet directly will be sent to AR/MAG from MN, and no longer be sent to HA through MN-HA tunnel.When AR/MAG receives this packet, packet is directly forwarded to CN by the local route optimization according to setting up for MN, CN.

Below in conjunction with a series of embody rule scene the present invention done and describe further.

Application scenarios 1:

The current ink that MN and CN is attached to same AR/MAG, MN attachment is home link, and AR/MAG is configured to allow to carry out optimizing local routing, and routing optimality concrete steps are as follows:

1, when MN (due to initial access network) is attached to AR/MAG, route requests (RS) message of " M " position 1 is sent to AR/MAG; When CN (due to initial access network or movement) is attached to AR/MAG, send common RS message (" M " position 0) to AR/MAG.

2, AR/MAG is for the MN supporting MIPv6, as just common couple in router (AR), declares the topological prefix of AR/MAG oneself to MN; PMIPv6 need be provided to serve to it for the CN not supporting MIPv6, AR/MAG, namely as the MAG of CN, be that CN simulates home link, one or more MN-HNP of being assigned to from LMA of declaration CN, and act on behalf of CN when CN is moved and carry out moving registration to LMA.

3, now, the communication path between MN and CN is: MN mails to the packet of CN, and destination address is CN-Addr, and source address is MN-HoA.Packet sends from MN, arrive after AR, will be forwarded to the route anchor point LMA of CN, packet is forwarded back to MAG by the bidirectional tunnel by setting up with MAG by LMA, by MAG, this packet is transmitted to CN, namely the forward-path of packet is: MN → AR/MAG → HA/LMA → AR/MAG → MN.CN mails to the packet of MN, and destination address is MN-HoA, and source address is CN-Addr.Because source address is CN-Addr, after packet arrives MAG, LMA will be forwarded to through LMA-MAG tunnel, then by LMA according to the destination address MN-HoA routing forwarding of packet to MN, namely the forward-path of packet is: CN → AR/MAG → HA/LMA → AR/MAG → MN.

4, HA/LMA receives < destination address from AR/MAG, source address > is <MN-HoA, CN-Addr> or <CN-Addr, MN-HoA>, through routing decision, this packet still need be forwarded back to same AR/MAG, then judge now as MIPv6-PMIPv6 interaction scenarios subfield scape one.

5, HA/LMA is by sending LORI message trigger route optimization process (subfield scape one) to this AR/MAG." S " position 0 of this message, mobile option comprises the network prefix option (CN-HNP, one or more, at least one) of the HoA option (MN-HoA) of MN, the identification options (CN-ID) of CN, CN.

6, after AR/MAG receives LORI message, first the attachment state of MN and CN is determined, reexamine local configuration, determine to allow to carry out optimizing local routing, set up two-way local route optimization option (LORE): in option, record down hop mark (L2 address as MN) that MN-HoA is corresponding respectively, the down hop mark that CN-HNP (one or more) is corresponding.

7, after successfully setting up local route optimization, AR/MAG is the LORA message of " 0 " to HA/LMA recoil state code.MN-HoA, CN-ID and CN-HNP (one or more) that the route optimization that mobile option comprises success foundation relates to.

8, HA/LMA is after receiving conditional code and being set to the LORA message of " 0 ", and banding cache item (BCE) place corresponding at corresponding MN-HoA and CN-HNP arranges mark, represents that corresponding local route optimization runs.

9, after routing optimality completes, the two-way packet of MN-CN all will be forwarded directly to destination node when reaching AR/MAG first by local route optimization.

Application scenarios 2:

The current ink that MN and CN is attached to same AR/MAG, MN attachment is foreign link, and AR/MAG is configured to allow to carry out optimizing local routing, and support between MN and AR/MAG to set up bidirectional tunnel, routing optimality concrete steps are as follows:

1, when MN (due to movement) is attached to AR/MAG, route requests (RS) message of " M " position 1 is sent to AR/MAG; When CN (due to initial access network or movement) is attached to AR/MAG, send common RS message (" M " position 0) to AR/MAG.

2, AR/MAG is for the MN supporting MIPv6, and as just common couple in router (AR), declare the topological prefix of AR/MAG oneself to MN, MN according to this prefix co-located care-of address MN-CoA, and will register to HA; PMIPv6 need be provided to serve to it for the CN not supporting MIPv6, AR/MAG, namely as the MAG of CN, be that CN simulates home link, one or more MN-HNP of being assigned to from LMA of declaration CN, and act on behalf of CN when CN is moved and carry out moving registration to LMA.

3, now, the communication path between MN and CN is: MN mails to the packet of CN, and internal layer destination address is CN-Addr, and source address is MN-HoA, and the outer destination address after encapsulation is the address (HA-Addr) of HA, and source address is MN-CoA.Packet through MN-HA tunnel to HA, this packet, to after packet decapsulation, according to internal layer destination address CN-Addr, is forwarded to MAG by by the tunnel between LMA-MAG by HA/LMA, be transmitted to CN by MAG again, the forward-path of packet is: MN → AR/MAG → HA/LMA → AR/MAG → MN.CN mails to the packet of MN, destination address is MN-HoA, source address is CN-Addr, after packet arrives MAG, will be forwarded to LMA by tunnel, HA carries out tunnel encapsulation to packet, outer layer destination address after encapsulation is MN-CoA, source address is HA-Addr, and data are forwarded to MN through HA-MN tunnel, and therefore the forward-path of packet is: MN → AR/MAG → HA/LMA → AR/MAG → MN.

4, HA/LMA receives < destination address from AR/MAG, source address > is <HA-Addr, after the packet decapsulation of MN-CoA>, internal layer bag < destination address, source address > is <CN-Addr, MN-HoA>, through routing decision, or <CN-Addr, MN-HoA>, through routing decision, this packet still need be forwarded back to same AR/MAG, then judge now as MIPv6-PMIPv6 interaction scenarios subfield scape two.Or HA/LMA receives < destination address from AR/MAG, source address > is the packet of <MN-HoA, HA-Addr>, HA is by searching banding cache item corresponding to MN-HoA, find the MN-CoA of its correspondence, find to need to be forwarded back to same AR/MAG by after this packet encapsulation, then judge now as MIPv6-PMIPv6 interaction scenarios subfield scape two.

5, HA/LMA is by sending LORI message trigger route optimization process (subfield scape one) to this AR/MAG." S " position 1 of this message, " S " position 0, mobile option comprises following option according to the order of sequence: MN-HoA, MN-CoA, CN-ID, CN-HNP (one or more, at least one).

6, after AR/MAG receives LORI message, first determine the attachment state of MN and CN, reexamine local configuration, determine to allow to carry out optimizing local routing, forward LORI message to MN.

7, after MN receives the LORI message of AR/MAG forwarding, after judging that route optimization is set up in support according to this locality configuration or security strategy etc., be the LORA message of " 1 " (allowing to set up route optimization) to AR/MAG recoil state code.

8, AR/MAG receives the conditional code of MN reply is after the LORA message of " 1 ", consults to set up bidirectional tunnel with MN, and two the sending out of MN and AR/MAG all can initiate tunnel negotiation process.The two ends in tunnel are respectively MN-CoA and AR/MAG address (AR/MAG-Addr).

9, after MN-AR/MAG tunnel is successfully established, MN will be established to the route optimization of CN in this locality: correspond to MN-AR/MAG tunnel by CN-HNP, and no longer correspond to MN-HA tunnel.

10, after MN-AR/MAG tunnel is successfully established, AR/MAG is that MN and CN sets up two-way local bidirectional optimistic route option (LORE): option records the MN-CoA of MN-HoA binding respectively, and the MN-AR/MAG tunnel of correspondence; Down hop down hop mark (L2 address as CN) that CN-HNP is corresponding.The routing table of priority higher than AR of LORE and the Binding Update list of MAG.

11, after successfully setting up local route optimization, AR/MAG is the LORA message of " 0 " to HA/LMA recoil state code.MN-HoA, CN-ID and CN-HNP (one or more) that the route optimization that mobile option comprises success foundation relates to.

12, HA/LMA is after receiving conditional code and being set to the LORA message of " 0 ", and banding cache item (BCE) place corresponding at corresponding MN-HoA and CN-HNP arranges mark, represents that corresponding local route optimization runs.

13, after routing optimality completes, MN mails to the packet of CN, and internal layer object and source address are respectively CN-Addr, MN-HoA, and the outer object of tunnel encapsulation and source address are respectively AR/MAG-Addr, MN-CoA.When AR/MAG receives this packet, after decapsulation, directly packet is forwarded to CN by according to the local route optimization set up for MN, CN.CN mails to the packet of MN, and object and source address are respectively MN-HoA, CN-Addr.After packet to AR/MAG, according to the local route optimization set up for MN, CN, will encapsulate packet, the outer object after encapsulation and source address are respectively MN-CoA, AR/MAG-Addr.After encapsulation, directly packet will be forwarded to MN by MN-AR/MAG tunnel.

Application scenarios 3:

The current ink that MN and CN is attached to same AR/MAG, MN attachment is foreign link, and AR/MAG is configured to allow to carry out optimizing local routing, and do not support between MN and AR/MAG to set up bidirectional tunnel, routing optimality concrete steps are as follows:

5, HA/LMA is by sending LORI message trigger route optimization process (subfield scape one) to this AR/MAG." S " position 1 of this message, " S " position 1, mobile option comprises following option according to the order of sequence: MN-HoA, MN-CoA, CN-ID, CN-HNP (one or more, at least one).

7, after MN receives the LORI message of AR/MAG forwarding, after judging that route optimization is set up in support according to this locality configuration or security strategy etc., be established to the route optimization of CN in this locality, the packet that mark mails to CN-HNP is directly sent to AR/MAG-Addr, and is no longer forwarded to HA by tunnel.To the LORA message that AR/MAG recoil state code is " 0 ".

8, AR/MAG receives the conditional code that MN replys be after the LORA message of " 0 ", for MN and CN sets up two-way local bidirectional optimistic route option (LORE): the down hop down hop that option records down hop down hop mark (L2 address as MN), the CN-HNP of the MN-CoA of MN-HoA binding and correspondence thereof corresponding respectively identifies (L2 address as CN).The routing table of priority higher than AR of LORE and the Binding Update list of MAG.

9, after successfully setting up local route optimization, AR/MAG is the LORA message of " 0 " to HA/LMA recoil state code.MN-HoA, CN-ID and CN-HNP (one or more) that the route optimization that mobile option comprises success foundation relates to.

10, HA/LMA is after receiving conditional code and being set to the LORA message of " 0 ", and banding cache item (BCE) place corresponding at corresponding MN-HoA and CN-HNP arranges mark, represents that corresponding local route optimization runs.

11, after routing optimality completes, MN mails to the packet of CN, and object and source address are respectively CN-Addr, MN-HoA, and this packet directly will be sent to AR/MAG from MN, and no longer be sent to HA through MN-HA tunnel.When AR/MAG receives this packet, packet is directly forwarded to CN by the local route optimization according to setting up for MN, CN.CN mails to the packet of MN, and object and source address are respectively MN-HoA, CN-Addr.After packet to AR/MAG, according to the local route optimization set up for MN, CN, directly packet is forwarded to MN.

Application scenarios 4:

(MN and CN is attached to same AR/MAG to MIPv6-PMIPv6 interaction scenarios B subfield scape one, the current ink of MN attachment is home link) under, built vertical routing optimality, HA/LMA moves to another AR/MAG or other reason due to perception MN or CN, route optimization is cancelled in requirement, concrete steps following (Figure 14):

1, HA/LMA sends to AR/MAG the LORI message that the lifetime is set to 0, and route optimization is cancelled in instruction.The mobile option of this message comprises following option according to the order of sequence: MN-HoA, MN-CoA, CN-ID, CN-HNP (one or more, at least one).Can by the conditional code of definition LORI message, the reason that instruction route optimization is cancelled.

2, after AR/MAG receives this message, cancel the two-way local route optimization into MN and CN sets up, and reply to HA/LMA the LORA message that the lifetime is set to 0.

3, after HA/LMA receives the LORA message of AR/MAG reply, the mark arranged at banding cache item (BCE) place that MN-HoA and CN-HNP is corresponding is cancelled.

4, afterwards, what MN with CN was two-way communicate is undertaken according to the path before optimizing.

Application scenarios 5:

(MN and CN is attached to same AR/MAG to MIPv6-PMIPv6 interaction scenarios B subfield scape one, the current ink of MN attachment is home link) under, built vertical routing optimality, AR/MAG moves to another AR/MAG or other reason due to perception MN or CN, route optimization is cancelled in requirement, concrete steps following (Figure 15):

1, AR/MA G to HA/LMA send " U " mark position 1, " lifetime " be set to 0 LORI message, route optimization is cancelled in instruction request.The mobile option of this message comprises following option according to the order of sequence: MN-HoA, MN-CoA, CN-ID, CN-HNP (one or more, at least one).Can by the conditional code of definition LORI message, the reason that instruction route optimization is cancelled.

2, after HA/LMA receives the LORA message of AR/MAG, conventional LORI message is sent to AR/MAG, " lifetime " of message is set to 0, and the mobile option of this message comprises following option according to the order of sequence: MN-HoA, MN-CoA, CN-ID, CN-HNP (one or more, at least one).Can by the conditional code of definition LORI message, the reason that instruction route optimization is cancelled.

3, after AR/MAG receives this message, cancel the two-way local route optimization into MN and CN sets up, and reply to HA/LMA the LORA message that the lifetime is set to 0.

4, after HA/LMA receives the LORA message of AR/MAG reply, the mark arranged at banding cache item (BCE) place that MN-HoA and CN-HNP is corresponding is cancelled.

5, afterwards, what MN with CN was two-way communicate is undertaken according to the path before optimizing.

Application scenarios 6:

(MN and CN is attached to same AR/MAG to MIPv6-PMIPv6 interaction scenarios B subfield scape two, the current ink of MN attachment is foreign link) under, built vertical routing optimality, HA/LMA moves to another AR/MAG or other reason due to perception MN or CN, route optimization is cancelled in requirement, concrete steps following (Figure 16):

2, after AR/MAG receives this message, first determine that whether MN is also attached thereto, if do not exist, then perform according to the subsequent step of embodiment five; If MN is also attached thereto, then perform in the steps below.

3, AR/MAG forwards LORI message to MN, and route optimization is cancelled in instruction.

4, after MN receives this LORI message, MN and AR/MAG cancels bidirectional tunnel, and MN cancels the route optimization to CN of foundation, and replys to AR/MAG the LORA message that the lifetime is set to 0.

5, after AR/MAG receives the LORA message of MN transmission, cancel the two-way local route optimization into MN and CN sets up, and reply to HA/LMA the LORA message that the lifetime is set to 0.

6, after HA/LMA receives the LORA message of AR/MAG reply, the mark arranged at banding cache item (BCE) place that MN-HoA and CN-HNP is corresponding is cancelled.

7, afterwards, what MN with CN was two-way communicate is undertaken according to the path before optimizing.

Routing optimality under The present invention gives MIPv6-PMIPv6 interaction scenarios B under different subfield scape is set up and is cancelled scheme, solves the Triangle routing problem under MIPv6-PMIPv6 interaction scenarios B.By the method that the present invention proposes, can by the communication path of two Correspondent Node MN and CN under MIPv6-PMIPv6 interaction scenarios B from be optimized for because HA/LMA is often positioned at core net, on the topology away from MN and CN, therefore, by above-mentioned optimization, significantly can promote the performance of data flow in delay and packet loss between MN and CN, this is vital for the application in real time such as the voice under mobile environment, video.In addition, the packet between MN and CN carries out twice unnecessary forwarding by link between AR/MAG and HA/LMA, not only increases the transmission delay of packet, too increases between the data volume of link, also will increase the data volume between Access Network and core net, and the bottleneck of transmission network between Access Network and core expense and performance often.By the optimization method that the present invention proposes, the data volume between Access Network and core net can be reduced, thus improve network performance.

Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; it should be noted; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Abbreviation and Key Term definition

IP Internet Protocol network interconnection agreement

IPv4 Internet Protocol Version4 network interconnection agreement (edition 4)

IPv6 Internet Protocol Version6 network interconnection agreement (version 6)

MIPv4 Mobile IPv4 mobile IPv 4

MIPv6 Mobile IPv6 mobile IP v 6

MN Mobile Node mobile node

CN Correspondent Node communication node

HoA Home-of Address home address

HL Home Link home link

FL Foreign Link foreign link

HA Home Agent home agent

CoA Care-of Address Care-of Address

LMA Local Mobile Anchor region mobile anchor point

MAG Mobile Access Gateway Mobile Access Gateway

LMAA LMA Address LMA address

PCoA Proxy CoA Agent care-of address

MN-HNP MN Home Network Proxy MN home network prefix

MN-HoA MN-Home Address MN home address

MN-HL MN-Home Link MN home link

MN-CoA MN-Care-of Address MN Care-of Address

RS Router Solicitation router request message

RA Router Advertisement router advertisement message

The local route optimization initial message of LORI Localized Optimized Routing Initiation

The local route optimization option of LORE Localized OptimizedRoute Entry

The local route optimization response message of LORA Localized Optimized Routing Acknowledge.

Claims

1. the routing optimization method under a MIPv6-PMIPv6 interaction scenarios, wherein, MIPv6-PMIPv6 network residing for described MIPv6-PMIPv6 interaction scenarios comprises both can as the couple in router in MIPv6 territory, again can as the entity of the Mobile Access Gateway in PMIPv6 territory: AR/MAG; And both can as the home agent in MIPv6 territory, again can as the entity of the region mobile anchor point in PMIPv6 territory: HA/LMA;

1) HA/LMA receives the data flow under MIPv6-PMIPv6 interaction scenarios B subfield scape one or subfield scape two;

2) HA/LMA notifies that the route of AR/MAG to the data flow under MIPv6-PMIPv6 interaction scenarios B subfield scape one or subfield scape two is optimized;

3) route of described AR/MAG to the data flow that HA/LMA notifies is optimized, and makes all bi-directional data bags between follow-up MN and CN of this data flow no longer forward described HA/LMA, but is directly forwarded to destination node.

2. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 1, it is characterized in that, described step 1) also comprise: HA/LMA checks the data flow under whether local data flow is MIPv6-PMIPv6 interaction scenarios B subfield scape one or subfield scape two, if the judgment is Yes, enter step 2), otherwise, repeated execution of steps 1) continue to check next data flow through local.

3. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 2, it is characterized in that, described step 2) also comprise: if current data stream is the data flow of MIPv6-PMIPv6 interaction scenarios B subfield scape one, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG.

4. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 3, it is characterized in that, described step 3) also comprise: described AR/MAG sets up local route optimization according to received local route optimization initial message, the routing table of priority higher than AR of local route optimization and the Binding Update list of MAG, make packet two-way between follow-up all MN and CN all be forwarded directly to destination node when reaching AR/MAG by local route optimization.

5. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 2, it is characterized in that, described step 2) also comprise: if current data stream is the data flow of MIPv6-PMIPv6 interaction scenarios B subfield scape two, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG and MN.

6. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 5, is characterized in that, described step 3) comprise substep:

7. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 6, is characterized in that, described step 33) also comprise:

Described bidirectional tunnel makes: MN mails to the packet of CN, internal layer object and source address are respectively the address of CN, the home address of MN, the outer object of tunnel encapsulation and source address are respectively the address of AR/MAG, the Care-of Address of MN, when AR/MAG receives this packet, after decapsulation, directly packet is forwarded to CN by according to the local route optimization set up for MN, CN;

CN mails to the packet of MN, object and source address are respectively the home address of MN, the address of CN, after packet to AR/MAG, according to the local route optimization set up for MN, CN, packet is encapsulated, outer object after encapsulation and source address are respectively the Care-of Address of MN, the address of AR/MAG, after encapsulation, directly packet are forwarded to MN by MN-AR/MAG tunnel.

8. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 2, it is characterized in that, described step 2) also comprise: if current data stream is the data flow of MIPv6-PMIPv6 interaction scenarios B subfield scape two, HA/LMA sends the local route optimization initial message carrying sub-scene type and prioritization scheme to AR/MAG.

9. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 8, is characterized in that, described step 3) comprise substep:

10. the routing optimization method under MIPv6-PMIPv6 interaction scenarios according to claim 9, is characterized in that, described step 33) also comprise:

MN mails to the packet of CN, object and source address are respectively the address of CN, the home address of MN, this packet is directly sent to AR/MAG from MN, and be no longer sent to HA/LMA, when AR/MAG receives this packet, packet is directly forwarded to CN by the local route optimization according to setting up for MN, CN;

CN mails to the packet of MN, and object and source address are respectively the home address of MN, the address of CN.After packet to AR/MAG, according to the local route optimization set up for MN, CN, directly packet is forwarded to MN.

11. according to the routing optimization method under the MIPv6-PMIPv6 interaction scenarios in claim 1 ~ 10 described in any one, it is characterized in that, described step 1) before, terminal node sends to AR/MAG and carries the router request message whether this terminal node supports the ICMPv6 protocol definition of the expansion of MIPv6 protocol information, according to the router request message of the ICMPv6 protocol definition of received expansion, described AR/MAG differentiates that this terminal node is MN or CN.