CN101002437A - Method for providing mobility to a mobile host in a network employing point-to-multipoint multi-protocol label switching - Google Patents
Method for providing mobility to a mobile host in a network employing point-to-multipoint multi-protocol label switching Download PDFInfo
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Abstract
A method is provided ensuring mobility to a mobile host in a wireless network with point to multipoint multi-protocol label switching deployed in the packet switched core network. When the mobile host is handed over between different domains of the radio access network, connected to different egress nodes of the core network, the setup of a new branch label switched path from an intermediate node to the new egress node is initiated by the intermediate node. The new branch label switched path is then associated with the existing label switched path to the old egress node. The optimum branch label switched path may be determined either by the old or by the new egress node.
Description
Technical field
The present invention relates generally to the mobile network.
Particularly, the present invention considers in whole or a part of wireline side (that is, core network and part radio access network (RAN)) deploy Multi-Protocol Label Switch (MPLS) of mobile network situation as the mobile network of transmission technology.In order to ensure service quality (QoS) requirement, set up tunnel based on MPLS, dispose the traffic engineering (te) option of MPLS signaling.One or more such based on the MPLS tunnel on the tunnel transmit and subscribe to the final receiver of roaming (mobile host, packet MH) are also referred to as label switched path (LSP) tunnel based on the tunnel of MPLS.And, between entrance and exit LSR, set up one or more points to multiple spot (P2MP) lsp tunnel by MH.
Background technology
For example the mobility of data communication rwan management solution RWAN is special-purpose and/or Circuit-switched technology in the cellular network of 2G (GSM) and 3G (UMTS).For the 4th generation (4G) mobile network in future, need be based on the mobility solution of packet-switched transmission technology.IETF have be called mobile IP (MIP) to standardization mobile management based on the IP packet switching network.In this standard, as the information of relevant destination, that is, the geo point of auxiliary device is determined in the IP address to the IP route clearly with the IP address of grouping.MIP will have Traditional IP route that mobile host wishes and be generalized to two IP addresses and be associated: static " initial " address and dynamically " Care-of Address (CoA) ", the current point of MH of Care-of Address reflection auxiliary device.The summary of relevant MIP function can be at Per kins et.al., and " IP Mobility Support forIPv4 ", RFC 3344, and August 2002, find among the pp.3-17.
And, hereinafter, suppose situation opposite with MIP, that when moving in the network of mobile host in same operator, keep identical ip addresses.Mobile network at application traffic engineering (TE) MPLS that guarantees QoS and TE with quick transmission goes up tunnel transmission IP grouping.Further describe the MPLS notion below and currently under MPLS, solve ambulant approach.
System model
The present invention is based on the structure that is intended to contain the 4th generation (4G) mobile network.This network is divided into core network and radio access network (RAN).An important requirement to RAN is, must support various access technologies, for example, and wireless lan (wlan), the 3rd generation (3G) RAN and following the 4th generation (4G) RAN.Here, adopt the system model of in the radio input field, organizing every kind of different radio access technologies partly.For these radio input fields, centralized configuration has been proposed, and the control and the management entity that are called radio access controller (RAC).Depend on radio access technologies, RAC inserts bridger (relevant with the IEEE802.1 structure), access controller (or the relevant AC of integral WLAN access infrastructure that adopts with IETF CAPWAP working group) or radio network controller (RNC is as defining among the 3G).The major function of RAC is control, management and supervision base station (BS) or the access point (AP) that wave point is provided at network side among the RAN.
Mobility under MPLS and the MPLS
This part is described the MPLS technology and it is applied in possibility among the mobile network as tunneled protocols.
The MPLS notion adopts two difference in functionality faces: chain of command and forwarding face.In chain of command, use standard routing protocol (for example, " SPF ", OSPF and " Border Gateway Protocol ", BGP) with other routers exchange information so that make up and keep and transmit.In forwarding face, when packet arrives, transmit parts and transmitting middle search, so that the route decision is made in each grouping.The short mark of regular length is attached in each grouping, so that sign forwarding equivalence class (FEC).Forwarding face under the MPLS is based on so-called label switched algorithm.The label switched device (is called LSR, LSR) carries out routing table lookup, packet map to FEC, then, before the next LSR in forwarding the packet to label switched path (LSP), is distributed to grouping with mark.The detail requirements of MPLS notion can be at " the Multiprotocol LabelSwitching Architecture " of E.Rosen, Floyd, A.Viswanathan and R.Callon, RFC 3031, January 2001, find in the 2nd and 3 parts of pp.3-37.
Still there is the intrinsic forwarded hop-by-hop example of standard I P route in above-mentioned MPLS.In order to improve efficient and the reliable network operation in the mpls domain, and in order to satisfy qos requirement, " Requirement for TrafficEngineering Over MPLS " at D.Awduche, J.Malcohm, J.Agogbua, M.O ' Dell and J.McManus, RFC 2702, September 1999, mainly stipulated the traffic engineering (te) ability of MPLS in the 2nd, 3 and 4 parts of pp.4-10.These abilities can be used to optimize the utilization of Internet resources and improve performance characteristics towards flow.The LSP that sets up by the TE constraint is called as lsp tunnel, because identify along mobile the finishing by the mark on the Ingress node that is applied in the path of LSP.If the array lsp tunnel is interrelated, for example, for whole group lsp tunnel is re-routed operation, then such group is called as traffic engineering tunnel (traffic engineering tunnel)." RSVP-TE:Extenstionto RSVP for Tunnels " at D.Awduche, L.Berger, D.Gan, T.Li, V.Sr inivasan and G.Swallow, RFC 3209, December 2001, stipulated term " lsp tunnel " and the definition of " traffic engineering tunnel " and their difference in the 2nd and 4 parts of pp.7-15 and 17-49.
Current, MPLS is become the general transmission technology by widespread deployment, and still, aspect standard, also not being fit to provides ambulant mechanism to lsp tunnel.Several nearest publications have been considered the deployment of MPLS among the mobile network." A NetworkArchitecture for MPLS-Based Micro-Mobility " at F.Chiussi, D.Khotimsky and S.Krishnan, in Proc.of the WirelessCommnunications and Networking Conference (WCNC), March 2002, among the sectionIII (pp.3-5), defined marker edge mobility agent (LEMA), it is positioned on all Edge LSR and some middle LSR that make up the hierarchy network.When mobile host is changed to new couple in router, the middle LEMA that builds LSP in advance in the middle of new couple in router is registered to the MH flow is mapped between LEMA and the edge LEMA." Practical Approaches for Supporting Micro Mobility with MPLS " at T.Yang, Y.Dong, Y.Zhang and D.Makrakis, in Proc.of the International Conference on Telecommunications (ICT), June 2002, among the sections II and III, the fine motion scheme of definition intersection LSR on the intersection point in the path between the path between two paths-GW and the old FA and GW and the new FA has been proposed.The LSR that intersects is established to the new LSP of new FA and forwards the traffic to new FA.
The mechanism that provides in citing document obtains the hypothesis of new IP CoA address based on disposing mobile IP and MPLS and MH together after switching.The invention that this paper provides is intended to introduce the mechanism that helps to dispose down in MPLS technology itself mobility and the signaling that does not rely on other agreement (for example, relevant mobile IP message).And opposite with described mechanism of people such as people such as the above-mentioned Chiussi that quotes and Yang, by means of method hereinafter described, when changing egress LSR, MH can keep identical ip addresses.This means that under the switching between the different radio access schemes, identical as long as inlet LSR (for example, network G W) keeps, MH will keep its IP address.Therefore, need a kind ofly provide mobility mechanism so that need not to change the method that the ground, IP address of MH is redirected to user's data stream new egress LSR to MPLS.
RSVP-TE and put multiple spot (P2MP) LSP
The MPLS structure makes the use of multiple labeling distributorship agreement become possibility, therefore, in chain of command, can use the different signaling protocols as label distribution protocol (LDP) and resource reservation protocol (rsvp).At first, design RSVP is to be implemented in integrated service (IntServ) notion that realizes QoS based on standard I P network down.Make RSVP as under MPLS, providing the signaling protocol of TE to become possibility with several extra objects expansion RSVP.Expansion RSVP is called as RSVP-TE, and describes expansion RSVP in the above in the 2nd and 4 parts of RFC 3290 7-15 that quote and 17-49 page or leaf in detail.Particularly, be with or without under the situation of resource reservation, the expansion RSVP is all supported the illustration of explicit route LSP.It also support lsp tunnel steady rerouting, try to be the first and occupy and loop detection.
In order to help to understand the present invention, the sign of lsp tunnel is described in this part below.As described in the 2.1st part on the RFC32 09 7-8 page or leaf, identified lsp tunnel uniquely by the SESSION and the SENDER_TEMPLATE object that comprise inlet LSR, egress LSR, tunnel ID, LSP ID and sender IP address.The SESSION object comprises 3 parameters:
-IPv4 (or IPv6) tunnel endpoint addresses: the IP address of the Egress node in tunnel;
-tunnel ID: 16 bit identifiers that remain unchanged at whole tunnel duration of existence; With
-expansion tunnel ID: usually, it all is arranged to zero, but it can comprise IP address as the Ingress node of GUID (so that with the scope of SESSION dwindle into inlet-outlet to).
The SENDER_TEMPLATE object comprises:
Sender address ,-IPv4 (or IPv6) tunnel: the IPv4 of sender's node (or IPv6) address;
-LSP ID: can change into allow sender and own shared resource, be used in 16 bit identifiers among SENDER_TEMPLATE and the FILTER_SPEC.
According to the sign of lsp tunnel among the RFC 32 09, as in situation of the present invention, supposing, when egress LSR changes, must generate new SESSION object, therefore, new lsp tunnel should be created as new egress LSR.The RSVP-TE signaling that we will stipulate in RFC3209 is called point-to-point (P2P) signaling.
The nearest work of IETF concentrates on and allows point to the expansion of the P2P RSVP-TE of multiple spot (P2MP) LSP signaling.These mechanism under the also not last regulation, still, are being discussed the suggestion of proposition in IETF." the Extensions to RSVP-TEfor Point to Multi-point TE LSPs " of R.Aggatwal, D.Papadimitriou and S.Yasukawa, Internet Draft, Work in Progress have described the change to P2P_SUB_LSP and the SERO and the SRRO object of SESSION and SENDER_TEMPLATE object and redetermination in the 21st part of 27-31 page or leaf.The P2MP LSP that is made of one or more P2Psub-LSP is by SESSION and SENDER_TEMPLATE object identity.The combination of SESSION object, SENDER_TEMPLATE object and P2P_SUB_LSP object identifies each P2Psub-LSP.People such as R.Aggarwal have further illustrated object and the difference of RFC3209 in specification requirement of P2MP LSP deeply.But the definition that the there provides only is understood as that the example that how can realize P2MPLSP.Other specific protocol also can be used for this purpose, as long as they allow to set up point-to-multi-point tunnel branch on middle LSR.According to the suggestion that people such as R.Aggarwal provide, the foundation of P2MP LSP and each sub-LSP is all sent signal by inlet LSR.
In order to share load on the network, MPLS is designed to determine the explicit path of specific stream.In inlet LSR, calculate and in EXPLICIT_ROUT object (ERO), encode and the explicit route of signalling lsp tunnel in PATH.The form and the option of ERO object have been described in list of references RFC3290 23-31 page or leaf the 4.3rd part.
" the SYSTEM AND METHOD FOR MOBILE SPECIFIC LABEL EDGEROUTER OPERATION WITHIN A CORE AND EDGE NETWORK " of CA2292252 discloses the packet exchange communication network that utilizes " moving special-purpose " LER (MLER) of being furnished with the mobile management function.MLER supports to switch to the calling of the another kind of label switched path of the 2nd MLER that is associated with target BS from the label switched path of a MLER who is associated with the current service radio base station.The method that can use predefined paths between LER (LER) and BS is provided.When switching, LER is that the MPLS head (header) of the packet of old base station is exchanged into the MPLS mark that the destination is new base station with the destination.But the described method of CA2292252 is not handled the situation that changes LER.
US20030110290A1 " MOBILE TRACKING SYSTEM FOR QOS GUARANTEED PATHS; ROUTER DEVICE USED FOR THIS SYSTEM; MOBILE COMMUNICATIONS TERMINAL; AND CONTROL PROGRAM FOR CONTROLING ROUTER DEVICE " transient router (TR) of any variation that is used to detect the visitor's location address by the report of existing QoS path disclosed.TR sets up new QoS according to testing result and ensures the path.Finish at TR before the foundation of new route, on old path, send grouping.Finished the foundation in QoS guarantee path to mobile communication terminal and remote terminal notice.In the method that US20030110290A1 provides, center manager or intermediate router (TR) management QoS ensures the foundation in path.For this reason, mobile communication terminal involves its position and the signaling of required qos parameter.Therefore, because there is bandwidth bottleneck in the interface of eating dishes without rice or wine and involves signaling paths, increased unnecessary burden.
At WO2003030467A2, in " MPLS DATA TRANSMISSION IN PACKET-ORIENTEDMOBILE RADIO NETWORKS ", unique MPLS mark is assigned to each terminal.This MPLS mark makes packet clearly be addressed to terminal.Router utilizes MPLS or other tunneled protocols to come the tunnel to transmit information block.
Disclosed method makes the unique MPLS mark notice MPLS router of last terminal with it.Then, the MPLS router utilizes label stacking that tunnels data packets is sent to last terminal.Portable terminal involves the exchange of MPLS signaling, and clear and definite mark need be assigned to MH.
Introducing TE MPLS embodies packet switching network required QoS (especially about real-time service) of optimization offered load and the advantage of TE might be provided in the mobile network.Because the system model of disposing has been supposed to set up lsp tunnel and MH changes tunnel egress node while moving by MH, so requirement dynamically changes egress LSR.When disposing the MPLS transmission, the most of current known arrangement that redirects customer service is all based on supposing that MH accepts the mobile IP of new CoA IP address when changing egress LSR.But hypothesis of the present invention is that when roaming between different egress LSRs, MH keeps identical IP address.
Keeping a solution of the continuous connection between the entrance and exit LSR when egress LSR changes is that the P2MP lsp tunnel is used for each MH, and when MH moves to new egress LSR, sets up the new LSP of branch.But, in inlet LSR, finish calculating and the signaling of setting up the LSP of branch.To catenet, this caused long handoff procedure and with the high signaling load of inlet LSR dealing.The particular problem that the present invention will solve is how to find out best branch LSR and need not to enter the mouth LSR participation ground Branch Computed LSP.
Summary of the invention
The invention provides especially at the service area that moves to another radio input field owing to MH from the service area of a radio input field, under the situation that egress LSR changes, can guarantee network mobile final receiver (mobile host, MH) and the improving one's methods of the continuous connection of inlet between the LSR.
The invention describes when the transmission between the entrance and exit LSR when putting multiple spot lsp tunnel technology, keep method by egress LSR from inlet LSR to the permanent communication of MH.MH can advantageously keep identical IP address when roaming between different egress LSRs.In described method, when MH moves to new egress LSR, between LSR of branch and new egress LSR, set up the new LSP of branch.This foundation is initiated by the LSR of branch.For how determining best branch LSR, provide two options: the new egress LSR in (1) old egress LSR or (2) can determine the best branch point.The LSP of branch route calculation can be finished in egress LSR, but alternately, also can finish in the LSR of branch.
In one embodiment, in will putting the wireless network of multiple spot multi protocol label exchange, provide mobility method to comprise the steps: to mobile host as the transmission technology between gateway and several radio access network territories
A) set up from Ingress node to the multi protocol label switching tunnel that is first Egress node of first radio access network territory service;
And, if described mobile host moves to the service area in the second radio access network territory from the service area in the described first radio access network territory, then:
B) determine from intermediate node to the branch's multi protocol label switching tunnel that is second Egress node of described second radio access network territory service;
C) initiate the foundation of described branch multi protocol label switching tunnel by described intermediate node; And
D) described branch multi protocol label switching tunnel is associated with the described multi protocol label switching tunnel of setting up in step a).
In another embodiment, a kind of telecommunication system comprises:
Mpls network has a plurality of LSRs of the node that forms described network, and one of described node is configured to Ingress node, to be provided to the connection of external packet-switched;
Mobile host has Internet Protocol address, and is configured to receiving block data; And
A plurality of radio access networks territory, each of described radio access network territory are configured to provide as the wireless connections between one of described node of the Egress node of described mpls network and the described mobile host;
Described network is configured to set up the multi protocol label switching tunnel from described Ingress node to first Egress node, and described first Egress node connects the first radio access network territory of first service area that belongs to described mobile host place, and
If mobile host changes over second service area in the second radio access network territory with its position from described first service area in the described first radio access network territory, then
Determine from intermediate node to the branch's multi protocol label switching tunnel that is second Egress node of described second radio access network territory service;
Initiate the foundation of described branch multi protocol label switching tunnel by described intermediate node; And
Described branch multi protocol label switching tunnel is associated with described multi protocol label switching tunnel from described Ingress node to described first Egress node.
In a further embodiment, the method for carrying out in a kind of intermediate node of the multi protocol label exchcange core network at wireless network comprises the steps:
Receive request, to be established to branch's multi protocol label switching tunnel of second Egress node that in described request, identifies;
Initiate the foundation of described branch multi protocol label switching tunnel; And
Described branch multi protocol label switching tunnel is associated with the existing multi protocol label switching tunnel that identifies in described request.
In another embodiment, the method of carrying out in a kind of first Egress node of the multi protocol label exchcange core network at wireless network is provided, described first Egress node receives the packet by existing multi protocol label switching tunnel, and this packet being forwarded to mobile host via first radio access network, described method comprises the steps:
Receive the information of identifier of second Egress node from mobile host about being the described label switched core network of second radio input field service;
Determine the intermediate node on the route of existing multi protocol label switching tunnel, as the branch node of the branch's multi protocol label switching tunnel that arrives described second Egress node; And
Request is set up the described branch multi protocol label switching tunnel that is associated with described existing multi protocol label switching tunnel from described determined intermediate node.
In other embodiments, the method for carrying out in a kind of second Egress node of the multi protocol label exchcange core network at wireless network comprises the steps:
From mobile host receive about be the service of the first radio input field described label switched core network first Egress node identifier information and about the information of the identifier of described mobile host;
Obtain information from described first Egress node about the existing multi protocol label switching tunnel of the packet of carrying described mobile host;
Determine the intermediate node on the route of existing multi protocol label switching tunnel, as the branch node of the branch's multi protocol label switching tunnel that arrives described second Egress node; And
Request is set up described branch multi protocol label switching tunnel from described definite intermediate node to second Egress node, that be associated with described existing multi protocol label switching tunnel from described definite intermediate node.
Description of drawings
For principle of the present invention is described, accompanying drawing is merged in the specification, form the part of specification.These accompanying drawings should not be construed restriction the present invention, and just example of the present invention is implemented and used to illustration how with describing.In conjunction with the drawings the present invention is carried out following more specifically description, it is clear that further feature of the present invention and advantage will become, in the accompanying drawings:
Fig. 1 has described mobile network's example system structure;
Fig. 2 represents the overlay model of network shown in Figure 1 from the visual angle of MPLS;
Fig. 3 illustration the alternate embodiment of Fig. 2, determine that wherein the entity of the LSR of branch is new egress LSR;
Fig. 4 shows the data surface protocol stack in the relevant entity of network of Fig. 1;
Fig. 5 shows the protocol stack of the relevant entity of the network of Fig. 1 in the chain of command;
Fig. 6 shows at old egress LSR and determines signaling under the LSR of the branch situation;
Fig. 7 shows at new egress LSR and determines signaling under the LSR of the branch situation; And
Fig. 8 shows the structure that can be used as the LSR of the node in the MPLS network.
Embodiment
Describe one exemplary embodiment of the present invention with reference to the accompanying drawings, in the accompanying drawings, identical unit is represented with identical Reference numeral with structure.
Fig. 1 has described and can be used for understanding better example system structure of the present invention.MH 109 is attached on the mobile network 100, and it can pass through gateway (GW) 108 and internet 116 or any other special use or common network and be connected.If MH 109 is in the home network, then its use home IP address with any other main-machine communication.Under MH 109 was in situation among the outside mobile network, MH 109 needed aforesaid Care-of Address (CoA).Under the situation of MIPv4, MH 109 can be from the retrieval of the external agent (FA) on being arranged in GW 108 for example CoA.Under the situation of MI Pv6, MH 109 can generate CoA by oneself by means of couple in router (AR).Here the mechanism of retrieving CoA is not described in more detail.In example shown in Figure 1, between GW 108 and radio access controller RAC 104, set up lsp tunnel 110 (relevant more detailed content please refer to above).According to system model shown in Figure 1, make following hypothesis:
-fine motion sight, wherein, MH 109 keeps identical IP address when moving between the different egress LSRs 104 and 105 in the mobile network.
-in order to ensure realizing required QoS, in the TE pattern, use MPLS, because this can further impel the mobile operator load in the configuration network more accurately.
-set up lsp tunnel by data flow to each MH.This requires to change the route of lsp tunnel when MH is mobile between egress LSR.
Fig. 1 shows the only example system structure that can use method described here.Wherein other configuration sight of the mobile network that changes because of the MH mobility of the exit point of lsp tunnel is possible.(be also referred to as layer 2, carry out the transfer of data on the RAN 102,103 on L2), and because scalability, (layer 3 L3) carries out transmission on the core network 101 on the packet switching network at the IP layer at link layer.In the method described herein, the transmission on the packet-switched core network 101 is based on TE MPLS.In Fig. 1, not parenthesized title illustrates functional classification, as (for example) RAC, gateway etc.Title in the bracket illustrates the respective name in the MPLS term, for example, and inlet/outlet LSR etc.
Mobile network's as shown in Figure 1 gateway (GW) the 108th, the entity of the inlet LSR in the realization MPLS transport layer and the function of external agent (FA) in the IP layer or couple in router (AR).We illustrate with two term FA and AR can support two kinds of Internet protocol version IPv4 and IPv6.FA is the element of mobile IPv 4 agreement, and AR is more suitable for and the mobile IPv 6 protocol use that combines.The detailed description of FA function can be at people's such as C.Perkins " IP Mobility Support for IPv4 ", and RFC 3344, and August 2002, find among the pp 5-6 and 47-54.Egress LSR and FA/AR may not be in the same entity physically, the more important thing is, egress LSR and FA/AR communicate by L2 technology commonly used as shown in Figure 4.According to this figure of back, the mobile network provides the connectedness between FA/AR and the MH 109.FA/AR offers MH 109 with L3 service 401.Communication between MH 109 and the FA/AR, and mobile IP function is not within the scope of the present invention.And hereinafter, we will use " GW " as the generic term that comprises egress LSR and FA/AR function.Owing to be primarily focused on here on the MPLS transfer of data on the core network, be on the link between GW 108 and the RAC 104,105 in a kind of possibility of physically shining upon lsp tunnel on the mobile network.
Return with reference to Fig. 1, according to the sight of supposing here, inlet LSR is in GW 108, and egress LSR is in RAC 104.On the LSR that enters the mouth, encapsulate (that is additional MPLS mark), transmission on pre-established lsp tunnel 110, sealing off on the egress LSR 104 and on the L2 on the RAN 102, transmitting the grouping that enters the mobile network and subscribe to specific MH 109 to MH 109.About the hypothesis among Fig. 1, RAC the 104, the 105th, is implemented in the L2 agreement used in the radio input field and the entity of edge/egress LSR function in data surface.In chain of command, RAC realization MPLS control protocol, that is, and RSVP-TE, and some IP-based signaling protocols that add that are used for central entity exchange mandate, checking and the record keeping (AAA) of (for example) and core network.
According to carrying out the hypothesis that transfer of data in the radio input field 102,103 and radio input field form a kind of Local Area Network in layer 2, we suppose that in Fig. 1 lsp tunnel 110 starts from GW 108 and RAC 104 finally.But the present invention can be applicable to form other sight of lsp tunnel 110 on whole or a part of wireline side of mobile network.For example, lsp tunnel can start from GW and BS finally.Therefore, we wish to promote this system model and introduce as shown in Figure 2, wherein be primarily focused on the MPLS correlation function of entity rather than concentrate geographically MPLS overlay model.And here, from the visual angle of MH, term " RAC " is as a MPLS enabled node.MH does not support MPLS, and communicates by letter with RAC on L2.Here the protocol stack that proposes for the transfer of data between MH and the gateway can be seen in Fig. 4.
Term used herein " mobile host (MH) " is similar notebook, 3G subscription equipment (UE) or even the common representative of the personal area network's (PAN) that is made up of several personal devices mobile designing apparatus.MH109 is connected with BS113 by Radio Link, and BS113 stops radio communication, and guarantees to be connected with the Wireline packet switching of other entity among the mobile network.
Referring now to Fig. 2 and 6, describe first embodiment in detail, wherein old egress LSR 1 is determined the LSR of branch.Fig. 2 represents based on system configuration shown in Figure 1, from the overlay model at the visual angle of MPLS.Initial " existing P2MP LSP " 110 joint access LSR 108 and old egress LSR 104.When MH 109 when the radio input field 102 of old egress LSR 104 services moves to another radio input field 102 of new egress LSR 105 services, following process takes place:
1. at first, MH 109 communicates by letter with egress LSR 1 by L2 line 601, and by the communication between old egress LSR 104 and inlet LSR 108 of old P2MP lsp tunnel 110.When MH 109 moved to new outlet LsR 105 regional, MH 109 received the broadcast (for example, under the situation of IEEE802.11 wireless access, this can be a beacon message) that is sent by base station shown in Figure 1 114 from new egress LSR 105 in step 602.According to this message, MH 109 can be known the identifier (for example, IP address or MAC Address) of new egress LSR 105 in step 603.This stage is corresponding to the step 201 among Fig. 2.
2.MH 109 are notified to old egress LSR 104 (step 202 among Fig. 2) with the identifier of new egress LSR 105 in step 604.There being several be that corresponding information is also included within the exchange of step 604 under the situation of the LSP that serves of MH 109.After this, egress LSR 1 can calculate which the most approaching new egress LSR 105 of the middle LSR 106,107 in the path that has P2MP LSP now.In other words, old egress LSR 104 is determined best branch LSR 107 in step 605.Because new egress LSR 105 has the definite knowledge of the route of network topology and existing LSP 110, so can carry out this calculating.For example, this is the situation as the OSPF of Routing Protocol that has the complete knowledge of region topology for the all-router in the route district.In the il-lustrative example of Fig. 2 and Fig. 6, best branch LSR is middle LSR 107.
3. after old egress LSR 104 has been determined best branch LSR 107, LSR 107 in the middle of old egress LSR 104 sends to request in step S606.This is corresponding to the step 203 among Fig. 2.In case receive request, middle LSR 107 just is initiated to the foundation of the new LSP of branch 111 of new egress LSR 105, and wherein, flow parameter (or QoS parameter) is identical with existing P2MP lsp tunnel 110.For Branch Computed LSP route, there are two kinds of possibilities:
-old egress LSR 104 calculates route and with the request of setting up the new LSP of branch 111 route signal is sent to the LSR of branch 107 in step 606, or
The LSP of-branch 107 utilizes its routing table, and oneself calculates LSP route (for example, under the situation of OSPF, this can be a shortest path tree).
4. when the information that has about the identifier of new outlet 105 and the LSP of branch 111 ERO objects, the LSR of branch 107 can generate the PATH of setting up the new LSP of branch 111 in step 607.In Fig. 2, the new LSP of branch 111 that is established to new egress LSR 105 is shown as step 204.After having finished foundation, middle LSR 107 upgrades it and transmits in step 608, so that duplicate input grouping, and it is sent to two interfaces that middle LSR 107 and old egress LSR 104 are connected with new egress LSR 105 from existing P2MPLSP 110.In other words, the new LSP of branch 111 is associated with existing LSP 110.In when request, the LSR of branch 107 can removal to the branch 112 of old egress LSR 104.And middle LSR 107 upgrades inlet LSR 108 with regard to P2MP LSP route with the variation of new ERO object by corresponding information being sent to inlet LSR 108.These variations can comprise the removal of the branch of the foundation of the new LSP of branch and existing LSP.
Before removal arrived the branch 112 of old egress LSR 104, MH 109 can link to each other a period of time with two radio access network territories.During so-called " soft handover ", MH 109 can be simultaneously from RAN territory 102 and 103 both receive packet.
Referring now to Fig. 3 and 7, the alternate embodiment that new egress LSR 105 is determined the LSR of branch 107 is described.In RAN district 103 (referring to Fig. 1) that MH 109 moves to 105 services of new egress LSR afterwards, following process takes place:
1. at first, MH 109 communicates by letter with old egress LSR 104 by L2 line 701, and by old P2MPLSP tunnel 110 communication between old egress LSR 104 and inlet LSR 108.When MH 109 moves to the RAN zone 103 of new egress LSR 105, MH 109 in step 702, receives by base station 114 send, from the broadcast (for example, under the situation of IEEE802.11 radio access, this can be a beacon message) of egress LSR 2.MH 109 sets up the L2 line 704 with new egress LSR 105 in step 703.The process of setting up this L2 line depends on the L2 technology of deployment.This stage is corresponding to the step 301 among Fig. 3.
2. after L2 is additional, MH 109 is notified to new egress LSR 105 with the identifier that its preceding L2 of auxiliary device-LSR 104 is ordered in step 705.In same step, MH 109 can also be notified to its identifier new egress LSR 105.After this, new egress LSR 105 can be in step 706 relevant with old egress LSR 104 exchanges current be the information of the existing LSP 110 that serves of MH 109.In Fig. 3, this is illustrated by step S302.There being several be that corresponding information is also included within the exchange of step 706 under the situation of the LSP that serves of MH 109.When having existing P2MP LSP to the information of the route of old egress LSR 104, new egress LSR 105 can be in step 707 from the LSR of visual angle calculating optimum branch of traffic engineering.Because new egress LSR 105 has the definite knowledge of network topology (for example, as described in precedent, relevant OSPF), so can carry out this calculating.In as Fig. 3 and example shown in Figure 7, best branch LSR be in the middle of LSR 107.
3. determined best branch LSR (middle LSR 107) afterwards at new egress LSR 105, LSR 107 in the middle of new egress LSR 105 sends to request in step S708.This is corresponding to the step 303 among Fig. 3.In case receive request, middle LSR 107 just is initiated to the foundation of the new LSP111 of branch of new egress LSR 105 in step 709, wherein, and identical in flow parameter (or QoS parameter) and the existing P2MP lsp tunnel 110.For Branch Computed LSP route, there are two kinds of possibilities:
-Xin egress LSR 105 calculates route and with the request of setting up the new LSP of branch 111 routing iinformation is sent to the LSR of branch 107, or
The LSP of-branch 107 utilizes its routing table oneself to calculate LSP route (for example, under the situation of OSPF, this can be a shortest path tree).
4. when the information that has about the identifier of new outlet 105 and the LSP of branch 111 ERO objects, the LSR of branch 107 can generate the PATH of setting up the new LSP of branch 111 in step 709.In Fig. 3, the new LSP of branch 111 that is established to new egress LSR 105 is shown as step 304.The process of attached step 710 with top in conjunction with Fig. 2 and 6 identical in the process described in the 4th.
Term " LSP of branch " is defined among Fig. 2 and Fig. 3 the LSP between clear that illustrate, LSR of branch and the specific egress LSR in this case.This definition is different with the definition of sub-LSP, and according to people's such as above-cited Aggarwal document, sub-LSP is the label switched path from inlet LSR to specific egress LSR.In people's such as Aggarwal situation, the LSP of branch can be used as the part of sub-LSP.After the foundation of having finished the new LSP of branch, for conformance with standard, the LSP of branch can be incorporated in comprise from the inlet LSR to the sub-LSP of egress LSR.Here further do not go through the LSP of branch is merged to process among the sub-LSP.
Fig. 4 shows relevant entity, for example, and the data surface protocol stack among inlet LSR, middle LSR 107, egress LSR 104,105 and the MH 109.This figure separately shows the protocol stack of FA/AR and inlet LSR, still, for the description here, has supposed that FA/AR and inlet LSR are arranged in same entity one gateway 108.Mention that it is important that communication 401 between GW 108 and the MH 109 occurs on the L2.The tunnel transmission of data between inlet LSR 108 and the egress LSR 104,105 by lsp tunnel.Between egress LSR 104,105 and MH 109, the tentation data transmission is on L2 (line 403).For example, if the L2 technology is an Ethernet, so, the gained protocol stack on the core network will be the Ethernet (EoMPLS) on the MPLS, and further handle the grouping of this machine Ethernet on RAN.
Fig. 5 shows the protocol stack in the chain of command.With data surface and chain of command separately is for the difference of used agreement is shown.As mentioned above, the MPLS signaling protocol 501 that adopts here is RSVP-TE.All entities that transmission in the lsp tunnel involves (inlet, outlet and middle LSR) are according to being encapsulated in the UDP/IP grouping and at LSR be grouped in the RSVP-TE message that sends between the LSR as normal IP and communicate.In chain of command, also carry out as shown in Figure 2 new egress LSR 105 (RAC2) and the communication between inlet LSR 108 (GW).
From top in conjunction with finding out obviously that the present invention has defined the expansion of following existing MPLS entity Fig. 2,3,6 and 7 described two examples:
New function in the egress LSR:
-can know the ID of other egress LSR by MH;
-and egress LSR can calculate the nearest/immediate LSR (that is best branch LSR) from existing P2MP LSP to new egress LSR 2;
-alternatively, egress LSR can also calculate the best route of the new LSP of branch;
-egress LSR can send to request signal the LSR of branch of new calculating, so that the new LSP of branch is set up in request;
-egress LSR also has reception (under the situation of new egress LSR) or alternately, transmission (under the situation of old egress LSR) has the ability of the ERO object of P2MP LSP now;
New function among the LSR of branch (that is middle LSR) allows to handle the request of setting up the new LSP of branch.Have only when centre LSR itself is gone in the request of setting up the new LSP of branch, middle LSR just becomes the LSR of branch.Only just must the following process of execution in as the LSR of branch of receiver of the request of setting up the new LSP of branch:
-generate the PATH set up the LSP of branch, wherein, utilize request message to receive the new egress LSR ID that will be comprised with PATH;
-to the existing P2MP LSP of same MH, extracting qos parameter;
-Branch Computed LSP route (ERO object) or
-acquisition the LSP of branch route from request message;
-(for example, upgrade in view of the above and transmit and will import packet copies to the old and new LSP of branch) can be associated the newly-installed LSP of branch with existing P2MP LSP.
LSR realizes that above-mentioned functions is not enforceable in the middle of all.In conjunction with as described in the 2nd of examples of Fig. 2,3,6 and 7 explanations, middle the LSR that only can finish the function of the LSR of branch just can be included in the database available on the egress LSR of definite best branch LSR as top.
If there are a plurality of P2MP LSP in LSR to each MH of old egress LSR from inlet, then carry out the process of setting up the new LSP of branch for all P2MPLSP.As described in people's such as R.Aggarwal document 3-4 page or leaf the 3.1st part, it is that they are organized in the P2MPTE tunnel that each MH keeps a kind of selection of a plurality of P2MP LSP.Wherein, by P2MP SESSION object identity P2MP traffic engineering tunnel.This object comprises P2MP ID, tunnel ID and the expansion tunnel ID that is defined as the destination identifier.Except destination-address is the P2MP identifier, rather than outside the IP address of Egress node, the field of this object is identical with SESSION object (definition among the RFC 3209 that quotes in the above).This identifier coding P2MP ID also identifies one group of destination of P2MPLSP.Combination sign P2MP lsp tunnel by P2MP SESSION object and SENDER_TEMPLATE object.Identical among SENDER_TEMPLATE object and the RFC 3209.The SENDER_TEMPLATE object comprises inlet LSR source address and LSP ID.Can create a plurality of examples of P2MP traffic engineering tunnel, that is, many P2MP lsp tunnels, each bar have different LSP ID.These P2MP lsp tunnels use different marks.
If the lsp tunnel that is associated with MH ID on the LSR of branch is two-way, the LSR of branch sets up the new LSP of branch as bidirectional tunnel.
Fig. 8 shows the demonstrative structure that can be used as the LSR 800 of the node in the MPLS network.Router 800 comprises processor or CPU 801, and node in the view network or LSR and decide carry out the step of said method able to programmely.The term of execution of program, can in advance instruction be stored among the RAM 802 with pending data.In addition, the instruction of program for good and all can be stored in the nonvolatile memory 803, nonvolatile memory 803 can be semiconductor memory or the magnetic hard disk as read-only memory (ROM), programmable read-only memory (prom), EPROM (Erasable Programmable Read Only Memory) (EPROM, EEPROM, flash memory).Alternately, or additionally, instruction can be stored in other computer-readable medium that will be inserted in the medium reading device 804, as CD, disk or tape, medium reading device 804 can be respective disc or band driver element.LSR also comprises the network interface 805 that it is connected with other LSR.If LSR is as radio access controller (RAC), it further comprises the interface 806 that is exclusively used in radio access network.All parts can link by bus 807 or by dedicated link and some or all of other parts.
For MH can seamlessly be moved, transfer period chien shih and the data flow maintenance activity of corresponding node be important.Advantageously, aforesaid various embodiment can be apace and can not caused packet loss ground to carry out switching between this input field.In addition, simultaneously packet is sent to old and new egress LSR, therefore, can advantageously support soft handover.Another advantage of disposing P2MP LSP is simultaneously final receiver (MH) to be connected with different egress LSRs, thereby is connected with different radio input field.
In the current P2MP LSP suggestion that IETF proposes, inlet LSR is responsible for all LSP and changes.Method described here moves on to outlet and the LSR of branch with process from inlet LSR, therefore, along with the LSR of branch initiates the foundation of the new LSP of branch, has reduced the processing among the inlet LSR.And, also reduced signaling with inlet LSR dealing.
Other advantage of institute's suggesting method is that egress LSR can rely on the knowledge of the topology information of Routing Area and existing LSP route and determine best branch LSR.The best of the LSR of branch determines to make Internet resources to obtain more good utilisation.
Another benefit of the present invention is not realize in each network entity that fine motion moves IP expansion, for example, and layering MIP or MIP fast.Standard MIPv4 or MIPv6 must realize (according to the situation among Fig. 4) in gateway (FA/AR) and MH.Because the current most of routers that are dispersed on the market are that MPLS can use, so the method that provides above makes handoff procedure concentrate on network side, and compare with fine motion MIP expansion, still less signaling and processing are provided.And advantageously, the ambulant management of MH is mainly finished at network side, makes MH break away from these tasks.In addition, this has alleviated the signaling burden on the radio link.
Though by invention has been described with reference to the embodiment that constitutes according to the present invention, but, it is evident that for the person of ordinary skill of the art, can make various changes and improvements to the present invention according to the content of telling about above with in the authority of appended claims, and not depart from spirit of the present invention and preset range.In addition, this paper does not describe those fields of believing that those of ordinary skill in the art is familiar with, so that invention as herein described can not buried among unnecessary details.So, should be understood that the present invention is not limited by particular exemplary embodiment, but limit by the scope of appended claims.
Claims (24)
1. one kind provides mobility method to mobile host in the multi protocol label that uses point to multiple spot exchanges as the wireless network of the transmission technology between gateway and a plurality of radio access networks territory, comprises the steps:
A) set up from Ingress node to the multi protocol label switching tunnel that is first Egress node of first radio access network territory service;
And, if described mobile host moves to the service area in the second radio access network territory from the service area in the described first radio access network territory, then:
B) determine from intermediate node to the branch's multi protocol label switching tunnel that is second Egress node of described second radio access network territory service;
C) initiate the foundation of described branch multi protocol label switching tunnel by described intermediate node; And
D) described branch multi protocol label switching tunnel is associated with the described multi protocol label switching tunnel of setting up in step a).
2. the method for claim 1, wherein step c) also comprises: before initiating described foundation and carrying out in described intermediate node, be described branch multi protocol label switching tunnel calculating optimum explicit traffic engineering route.
3. the method for claim 1, wherein step b) also comprises: be described branch multi protocol label switching tunnel calculating optimum explicit traffic engineering route.
4. as claim 1 or 3 described methods, wherein, step b) is carried out by described first Egress node, and
After step b) and in the step e) before the step c), described first Egress node sends to described intermediate node with request, so that be established to the described branch multi protocol label switching tunnel of described second Egress node.
5. method as claimed in claim 4, wherein, after step a) and in the step f) before the step b), described mobile host obtains information about the identifier of described second Egress node from described wireless network, and will send to described first Egress node about the notice of described identifier.
6. as claim 1 or 3 described methods, wherein, step b) is carried out by described second Egress node, and
After step b) and in the step g) before the step c), described second Egress node sends to described intermediate node with request, so that be established to the described branch multi protocol label switching tunnel of described second Egress node.
7. method as claimed in claim 6, wherein, after step a) and step b) before step h) in, described mobile host is established to the connection of described second Egress node, and will send to described second Egress node about the notice of the identifier of himself identifier and described first Egress node; And
Described second Egress node is from the information of described first Egress node acquisition about the existing multi protocol label switching tunnel of the packet of carrying mobile host.
8. method as claimed in claim 7 wherein, comprises information about the explicit route of described existing multi protocol label switching tunnel about the described information of existing multi protocol label switching tunnel.
9. as the described method of one of front claim, wherein, step k after having finished described step d)) in, intermediate node duplicates the grouping that arrives by the described multi protocol label switching tunnel of setting up in step a), and they are transmitted to first and second Egress nodes.
10. method as claimed in claim 9, wherein, at step k) during, described mobile host receives packet from the described first and second radio access network territories simultaneously.
11. as the described method of one of front claim, wherein, the QoS parameter of the respective service mass parameter of the multi protocol label switching tunnel that will equal to set up in step a) is distributed to branch's multi protocol label switching tunnel.
12. as any described method of claim 9 or 10, at step k) afterwards, may further comprise the steps:
L) will ask to send to described intermediate node from described first Egress node, branch's multi protocol label switching tunnel with removal from intermediate node to first Egress node, described branch multi protocol label switching tunnel is associated with the multi protocol label switching tunnel of setting up in step a); And
M) initiate the removal of described branch multi protocol label switching tunnel by described intermediate node from intermediate node to first Egress node.
13. any the described method as claim 1 to 8 after step d), may further comprise the steps:
L) will ask to send to described intermediate node from described first Egress node, branch's multi protocol label switching tunnel with removal from intermediate node to first Egress node, described branch multi protocol label switching tunnel is associated with the multi protocol label switching tunnel of setting up in step a); And
M) initiate the removal of described branch multi protocol label switching tunnel by described intermediate node from intermediate node to first Egress node.
14. as the described method of one of front claim, wherein, step a) is included as other multi protocol label switching tunnel that identical mobile host is established to first Egress node, and is every multi protocol label switching tunnel execution in step c) and d).
15. as the described method of one of front claim, wherein, described intermediate node will send to described gateway about the information of the route that changes the multi protocol label switching tunnel, described change is initiated by described intermediate node.
16. a telecommunication system comprises:
Mpls network has a plurality of LSRs of the node that forms described network, and one of described node is configured to Ingress node, to be provided to the connection of external packet-switched;
Mobile host has Internet Protocol address, and is configured to receiving block data; And
A plurality of radio access networks territory, each of described radio access network territory are configured to provide as the wireless connections between one of described node of the Egress node of described mpls network and the described mobile host;
Described network is configured to set up the multi protocol label switching tunnel from described Ingress node to first Egress node, and described first Egress node connects the first radio access network territory of first service area that belongs to described mobile host place, and
If mobile host changes over second service area in the second radio access network territory with its position from described first service area in the described first radio access network territory, then
Determine from intermediate node to the branch's multi protocol label switching tunnel that is second Egress node of described second radio access network territory service;
Initiate the foundation of described branch multi protocol label switching tunnel by described intermediate node; And
Described branch multi protocol label switching tunnel is associated with described multi protocol label switching tunnel from described Ingress node to described first Egress node.
17. a method of carrying out in the intermediate node of the multi protocol label exchcange core network of wireless network comprises the steps:
Receive request, to be established to branch's multi protocol label switching tunnel of second Egress node that in described request, identifies;
Initiate the foundation of described branch multi protocol label switching tunnel; And
Described branch multi protocol label switching tunnel is associated with the existing multi protocol label switching tunnel that identifies in described request.
18。Method as claimed in claim 17 also comprises the steps:
After the described foundation of having finished described branch multi protocol label switching tunnel, the request that receives is the branch's multi protocol label switching tunnel from intermediate node to first Egress node with removal, and described branch multi protocol label switching tunnel is associated with the multi protocol label switching tunnel of setting up in step a); And
The removal of the described branch multi protocol label switching tunnel of initiation from intermediate node to first Egress node.
19. stored when being performed on the processor at network node on it, made network node carry out computer-readable recording medium for one kind as the instruction of claim 17 or 18 described methods.
20. method of in first Egress node of the multi protocol label exchcange core network of wireless network, carrying out, described first Egress node receives the packet by existing multi protocol label switching tunnel, and this packet being forwarded to mobile host via first radio access network, described method comprises the steps:
Receive the information of identifier of second Egress node from mobile host about being the described label switched core network of second radio input field service;
Determine the intermediate node on the route of existing multi protocol label switching tunnel, as the branch node of the branch's multi protocol label switching tunnel that arrives described second Egress node; And
Request is set up the described branch multi protocol label switching tunnel that is associated with described existing multi protocol label switching tunnel from described determined intermediate node.
21. method as claimed in claim 20 also comprises the steps:
After the described foundation of having finished described branch multi protocol label switching tunnel, send request to described intermediate node, branch's multi protocol label switching tunnel with removal from intermediate node to first Egress node, described branch multi protocol label switching tunnel is associated with the multi protocol label switching tunnel of setting up in step a).
22. stored when being performed on the processor at network node on it, made network node carry out computer-readable recording medium for one kind according to the instruction of claim 20 or 21 described methods.
23. the method that can carry out in second Egress node of the multi protocol label exchcange core network of wireless network comprises the steps:
From mobile host receive about be the service of the first radio input field described label switched core network first Egress node identifier information and about the information of the identifier of described mobile host;
Obtain information from described first Egress node about the existing multi protocol label switching tunnel of the packet of carrying described mobile host;
Determine the intermediate node on the route of existing multi protocol label switching tunnel, as the branch node of the branch's multi protocol label switching tunnel that arrives described second Egress node; And
Request is set up described branch multi protocol label switching tunnel from described definite intermediate node to second Egress node, that be associated with described existing multi protocol label switching tunnel from described definite intermediate node.
24. stored when being performed on the processor at network node on it, made network node carry out the computer-readable recording medium of the instruction of method according to claim 23 for one kind.
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- 2004-08-13 WO PCT/EP2004/009112 patent/WO2006015614A1/en not_active Application Discontinuation
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- 2004-08-13 CN CNA2004800438006A patent/CN101002437A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102811165A (en) * | 2011-05-31 | 2012-12-05 | 巴比禄股份有限公司 | Network system, gateway device and method of determining a forwarding path |
| CN102231704A (en) * | 2011-06-24 | 2011-11-02 | 中兴通讯股份有限公司 | Method and apparatus for disposing service in RSVP-TE dynamic tunnel |
| WO2012174955A1 (en) * | 2011-06-24 | 2012-12-27 | 中兴通讯股份有限公司 | Method and device for service deployment in rsvp-te dynamic tunnel |
| CN102231704B (en) * | 2011-06-24 | 2017-09-19 | 中兴通讯股份有限公司 | The method and apparatus of service deployment in a kind of RSVP TE dynamic tunnels |
| CN105828406A (en) * | 2012-02-06 | 2016-08-03 | 丛林网络公司 | Mobile node host route installation and withdrawal |
| CN105828406B (en) * | 2012-02-06 | 2019-05-31 | 丛林网络公司 | The installation of mobile node Host routes and revocation |
| CN109962849A (en) * | 2017-12-22 | 2019-07-02 | 华为技术有限公司 | The method and relevant device of transport multicast message |
| CN109962849B (en) * | 2017-12-22 | 2021-09-14 | 华为技术有限公司 | Method and related equipment for transmitting multicast message |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1776806A1 (en) | 2007-04-25 |
| WO2006015614A1 (en) | 2006-02-16 |
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