CN101043727A - Method for realizing target optimum selecting three-layer fast switching in evolvement network - Google Patents
Method for realizing target optimum selecting three-layer fast switching in evolvement network Download PDFInfo
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Abstract
The provided target optimal three-layer fast switch method in evolution network comprises: (1) when up to the switch condition, MN reports RtSolPr message to the AGW/RRM function entity; (2) the source AGW/RRM decides the target AGW/RRM according to RtSolPr content, and obtains the new address NcoA used in target AGW/RRM; (3) the source AGW/RRM sends PrRtAdv message to notify MN the access message on target AGW/RRM; (4) MN binds the NcoA to the source AGW/RRM; (5) MN binds the CN with its NcoA; and (6) the target AGW/RRM re-builds dialogue to MN.
Description
Technical field
The present invention relates to the communications field, especially relate to and utilize FMIPv6 (Fast Handovers for Mobile IPv6 in a kind of evolvement network, the quick switching of mobile IP v 6) and CARD (Candidate Access Router Discovery, candidate access router discovery) agreement realizes the target optimum selecting three-layer fast switching method of MN (Mobile Node, portable terminal).
Background technology
In the prior art, the data of CDMA2000 EVDO network must be via base station-BSC (BaseStation Controller, base station controller)-PCF (Packet Control Function, Packet Control Function)-PDSN (Packet Data Serving Node, packet data serving node) 4 equipment carry out centralized control and processing to PDSN, the time-delay that subscriber signaling, data pass to core net is big, and the complex interfaces of each equipment room.
The evolvement network aspect is to all-IPization at present, and the cry of simplifying the network equipment and interface is more and more higher, and operator and equipment commercial city wish that future network has simpler network configuration, and the least possible equipment room interface is to be easy to management and product development.Fig. 1 is to the structure imaginary picture of primitive people of evolvement network in the prior art, as shown in Figure 1, what show is that data are passed through BTS (Base TransceiverSystem, base station transceiver system) the proprietary IP network via operator is connected to AGW (AccessGateway, IAD) the double-layer structure scheme of controlling and handling, wherein, above-mentioned AGW may be total to equipment with RRM (Radio Resource Management, RRM) module.
Under above-mentioned new network configuration, the switching flow that MN is transregional has had new demand, and considers the demand of roaming mutually, switching between following multiple mobile network, needs a kind of treatment mechanism that has nothing to do with link layer.Mobile IP adapts to the best solution of this demand beyond doubt, but the implementation of early stage mobile IP be at WLAN (wireless local area network) such among a small circle based on the network design of transfer of data, the time-delay that network switches is bigger, and unstable properties, when particularly the real time flow medium that performances such as the time-delay of switching, packet loss is had higher requirements at voice-over, video etc. was professional, it is unable to do what one wishes that mobile IP more seems.
In the prior art MN/ couple in router do not support under the mobile IP quick switch signaling switching flow as shown in Figure 2, the steps include:
Step 201, MN are just keeping conversation procedure by PAR (Previous Access Router, primary access router) and CN (Correspond Node, Correspondent Node);
MN detects a new access point that has than strong waveguide frequency signal, and at this moment, MN and PAR disconnect, and is connected among the AP (Access Point, access point) in the new network;
Step 202, the MN NAR (New Access Router, new couple in router) in new network sends the route requests signaling;
Step 203, NAR send the route announcement of carrying network prefix information to MN;
MN generates NcoA (New Care-of Address, new Care-of Address) in new network, and binds this NcoA to HA (Home Agent, home agent)/CN transmission BU (Binding Update, Binding Update) information; The step of this generation and binding NcoA can be carried out after MN and PAR disconnection.
Step 204, MN utilize NcoA to begin new session by NAR and CN.
The shortcoming of above-mentioned steps 201-204 is:
1) from disconnecting and being connected of source network, being connected during this period of time to setting up network layer with NAR, MN can't receive/and send out information any or set up session connection;
2) set up being connected of network layer at MN and NAR, successfully bound during this period of time to MN and HA/CN, MN can't receive any data and session connection request;
Obtain New Network Information when 3) MN is connected to new network, form NCoA, the binding procedure that proceeds to HA/CN all expends the long period, add the time of authentication, handoff delay and packet loss are all very serious, can't satisfy the requirement of seamless switching fully, voice, video communication all can have long-time interruption;
4) MN obtains NCoA by the stateless mode after being connected to NAR, though this mode does not need the participation of extra-service device, may there be conflict or invalid in the NCoA that obtains, in this case, remove unartificial eliminating, otherwise MN can't communicate by letter, this is can't be received in telecommunications network.
In existing network, can utilize FMIPv6 to realize quick switching between the MN different access networks, its flow process as shown in Figure 3, Figure 4:
Should switch fast and comprise two scenes:
First scene, as shown in Figure 3, MN promptly receives FBAck message in source network, and its step is as follows:
Step 301, MN and current PDSN1 keep conversation procedure;
Step 302, MN detect the access point that has than strong waveguide frequency signal and trigger switching flow;
The BSC 1 of step 303, PDSN 1 sends the session transmissions request to the BSC 2 of target access network, connects by the A16 interface between BSC, comprises the IP address of source PDSN 1 in this session transmissions request;
Step 304, pre-established A10 connect, and the IP address of announcement PDSN 1;
Step 305, PDSN 2 initiate to switch fast initial message to PDSN 1, and announce himself IP address and network prefix;
Step 306, PDSN 1 reply to PDSN 2 and switch initial communication fast, and transmit relevant informations such as PPP context, TFT;
Whether whether step 310, PDSN 2 send the announcement of HAck response message to PDSN 1 and allow to switch, as allow then to distribute the NCoA that carries in NCoA or the checking HI message effective, illegal, invalid or distributed and then reassigned NCoA as NCoA;
At this moment, MN and PDSN 1 place network disconnect, and switch in the network of going into PDSN 2 places, and PDSN1 will newly arrive the packet that mails to MN PCoA address and be forwarded to PDSN 2;
Step 312, PDSN 2 rebulid the session of MN;
After step 313, MN switch the network of PDSN 2, send its arrival and link layer address thereof of FNA message announcement to PDSN2;
PDSN 2 all is transmitted to MN with cached data packet.
Second scene, as shown in Figure 4, MN disconnects with source network after receiving PrRtAdv message, and its step is as follows:
Step 401, MN and current PDSN1 keep conversation procedure;
Step 402, MN detect the access point that has than strong waveguide frequency signal and trigger switching flow;
The BSC 1 of step 403, PDSN 1 sends the session transmissions request to the BSC 2 of target access network, connects by the A16 interface between BSC, comprises the IP address of source PDSN 1 in this session transmissions request;
Step 404, pre-established A10 connect, and the IP address of announcement PDSN 1;
Step 405, PDSN 2 initiate to switch fast initial message to PDSN 1, and announce himself IP address and network prefix;
Step 406, PDSN 1 reply to PDSN 2 and switch initial communication fast, and transmit relevant informations such as PPP context, TFT;
At this moment, MN and PDSN 1 place network disconnect, and switch in the network of going into PDSN 2 places;
Step 408, PDSN 2 rebulid the session of MN;
NAR will receive that PDSN 2 transmits the packet that comes and all is transmitted to MN.
Step in above-mentioned two scenes is that MN utilizes FMIPv6 to realize the flow process of switching fast at existing C DMA EVDO network, there is the BTS-BSC-PCF three-decker in its Access Network, there is ppp link in MN between PDSN, needs to have between BSC the A16 interface to transmit relevant session information during switching.The complicated network structure, the interface of using this scheme are numerous, and the relevant information that needs maintenance of PPP link and transmit PPP when switching connects to rebuild PPP on new PDSN.
Simultaneously, the choice mechanism when yet not having explanation that a plurality of optional target access is arranged in the such scheme is not considered the real needs of terminal, and such as the type of eating dishes without rice or wine, Capability Requirement, QoS ability etc., so this scheme may not be an optimum to the selection of target access.
Do not indicate the time point that MN is initiated to the CN Binding Update in the flow process of Fig. 3, Fig. 4, but, therefore must can send binding update messages to MN to CN after the employed NCoA approval and bind its NCoA being connected to new network and obtaining NAR because the NCoA that obtains by the stateless mode may be invalid or has conflict on new network.Mechanism according to the MIPv6 routing optimality, before MN arrives the CN Binding Update with NCoA, the data of sending from CN can forward MN to the tunnel of NAR to before final by PAR, but MN understands owing to not existing the MN home address to be dropped to the binding of this NCoA on the CN as the packet that former forwarding address sends to CN with NCoA.
Summary of the invention
Big at handoff delay in the quick switching flow of not supporting FMIPv6 in the above-mentioned prior art one, the packet loss phenomenon serious and prior art two in utilize the non-optimal selection mechanism of target access in the quick switching flow of FMIPv6 and the data packet drop that might cause, the objective of the invention is to, a kind of method is provided, can solve the switching problem of portable terminal between different IADs, reduce time-delay and packet loss problem in the handoff procedure, the optimized choice mechanism of target access can be provided simultaneously.
For realizing purpose of the present invention, the invention provides the implementation method that target optimum selecting three-layer in a kind of evolvement network switches fast, portable terminal MN promptly obtains the access information of target access network at source network, comprises step:
(1) MN sends RtSolPr information reporting source medium IAD/RRM AGW/RRM functional entity after switching condition reaches;
(2) source AGW/RRM determines the switching target AGW/RRM of MN according to the content in the RtSolPr message, and obtains the new Care-of Address NcoA that MN uses in target AGW/RRM;
(3) source AGW/RRM sends PrRtAdv message to MN and informs its access information at target AGW/RRM;
(4) MN binds its NcoA to source AGW/RRM;
(5) MN binds its NcoA to Correspondent Node CN;
(6) target AGW/RRM rebulids the session of MN.
The described switching condition of step (1) is to detect one or more to have WAP (wireless access point) than strong waveguide frequency signal.
Comprise link layer address, pilot frequency intensity or the MN of target access Capability Requirement information in the described RtSolPr message of step (1) to the switching target access point.
Described link layer address is sectors/cells ID.
Comprise MN-AR CARD Req message in the described RtSolPr message of step (1).
The described source AGW/RRM of step (2) comprises step according to the switching target AGW/RRM of the decision of the content in RtSolPr message MN:
Source AGW/RRM obtains IP address, the ability information of target AGW/RRM according to the content in the RtSolPr message by the sectors/cells ID inquiry CAR tables of data of target access;
Source AGW/RRM is according to the switching target AGW/RRM of the information decision MN of one or more AGW/RRM that grasps.
When MN has requirement to the ability of target AGW/RRM, and corresponding list item comprises step when out of date:
Source AGW/RRM sends AR-AR CARD Req message request the other side's ability information to target AGW/RRM;
Target AGW/RRM replys its ability information of AR-AR CARD Reply message announcement.
The new Care-of Address NcoA that the described source AGW/RRM acquisition of step (2) MN uses in target AGW/RRM comprises step:
The new Care-of Address NcoA that source AGW/RRM uses in target AGW/RRM to DHCP Server request MN according to the address of target AGW/RRM;
DHCP Server is assigned with this address of tense marker to the NcoA that source AGW/RRM returns request.
Comprise MN-AR CARD Reply message in the described PrRtAdv message of step (3).
The described MN of step (3) comprises the IP address of target AGW/RRM, the link layer address of access point and the NCoA of MN at the access information of target AGW/RRM.
Also comprise step behind the switching target AGW/RRM of the described source AGW/RRM of step (2) according to the decision of the content in RtSolPr message MN:
Source AGW/RRM transmits the current session related information of MN to target AGW/RRM.
The described MN of step (4) binds its NcoA to source AGW/RRM and comprises step:
MN sends quick Binding Update FBU message to source AGW/RRM and binds its NcoA;
Source AGW/RRM sends to target AGW/RRM and switches initial HI message, NCoA, the former Care-of Address PCoA of announcement MN, link layer address information;
Target AGW/RRM sends to switch to source AGW/RRM and confirms the response message of Hack message as HI;
After source AGW/RRM receives the Hack message of target AGW/RRM, send quick binding acknowledgement FBack message to MN.
Source AGW/RRM also comprises step after MN sends FBack message:
MN switches into target access network, source AGW/RRM will arrive and buffer memory to the packet of MN PCoA by and target AGW/RRM between the tunnel before forward MN to.
The described MN of step (5) binds its NcoA to CN and comprises step:
MN sends Binding Update BU message to CN and binds its NCoA;
CN replys binding acknowledgement BACK message to MN.
Method of the present invention also comprises step:
After MN switches target access network, send its arrival and link layer address of quick neighbor advertisement FNA message announcement, inform that target AGW/RRM will newly arrive with cached data packet to be transmitted to MN by the NCoA address to target AGW/RRM.
The session that the described target AGW/RRM of step (6) rebulids MN is that target AGW/RRM utilizes the current session related information of MN of described transmission to be established to the session of MN.
The described source AGW/RRM of step (3) also comprises step after MN transmission PrRtAdv message is informed the access information of its target AGW/RRM:
MN switches in the new network, sends its use of arrival, link layer address and NCoA of FNA message announcement encapsulated FBU message to target AGW/RRM.
The described MN of step (4) binds its NcoA to source AGW/RRM and comprises step:
MN sends FBU message by target AGW/RRM to source AGW/RRM and binds its NcoA;
Source AGW/RRM sends FBack message to MN.
The described MN of step (5) binds its NcoA to CN and comprises step:
MN sends BU message by target AGW/RRM to CN and binds its NCoA;
CN replys BACK message to MN.
Described source AGW/RRM also comprises step after MN sends FBack message:
Source AGW/RRM will arrive and buffer memory to the packet of MN PCoA by and target AGW/RRM between the tunnel before forward MN to.
Method of the present invention also comprises step:
After MN switches target access network, send its arrival and link layer address of quick neighbor advertisement FNA message announcement, inform that target AGW/RRM will newly arrive with cached data packet to be transmitted to MN by the NCoA address to target AGW/RRM.
The session that the described target AGW/RRM of step (7) rebulids MN is that target AGW/RRM utilizes the current session related information of MN of described transmission to be established to the session of MN.
The described source AGW/RRM of step (4) also comprises step after MN transmission PrRtAdv message is informed the access information of its target AGW/RRM:
MN switches in the new network, sends its use of arrival, link layer address and NCoA of FNA message announcement encapsulated FBU message to target AGW/RRM.
The described MN of step (5) binds its NcoA to source AGW/RRM and comprises step:
MN sends FBU message by target AGW/RRM to source AGW/RRM and binds its NcoA;
Source AGW/RRM sends FBack message to MN.
The described MN of step (6) binds its NcoA to CN and comprises step:
MN sends BU message by target AGW/RRM to CN and binds its NCoA;
CN replys BACK message to MN.
Described source AGW/RRM also comprises step after MN sends FBack message:
Source AGW/RRM will arrive and buffer memory to the packet of MN PCoA by and target AGW/RRM between the tunnel before forward MN to.
Implement the present invention, its beneficial effect that brings is:
1) realized the switching problem of MN between different IADs in the FMIPv6 network;
2) as a rule, MN can both obtain the relevant information and the Care-of Address of target access gateway and be accomplished to the registration of CN before switching to new IAD, significantly reduced handoff delay, simultaneously after switching to target access gateway, former IAD will receive that by the tunnel packet that mails to the former Care-of Address of MN with buffer memory is forwarded to the current Care-of Address of MN, reduce the generation of packet loss, realized seamless switching;
3) former AGW/RRM equipment is about to its current session related information and is delivered to target AGW/RRM equipment before MN switches, and makes that MN can the new session of very fast recovery behind the new IAD of arrival;
4) realize the address of a plurality of optional target AGW/RRM is obtained and ability discovery by the CARD agreement, can better meet different terminals, different business, realize optimum switching selection demands such as network interface characteristic, QoS abilities;
5) the quick switching based on FMIPv6 is totally independent of carrying media and link layer information, has realized the quick switching of MN being suitable for the switching of MN between heterogeneous network in network layer.
Description of drawings
Fig. 1 is to the structure imaginary picture of primitive people of evolvement network in the prior art;
Fig. 2 is that the MN/ couple in router is not supported switching flow figure under the mobile IP quick switch signaling in the prior art;
Fig. 3 is that MN utilizes FMIPv6 to realize the flow chart one that switches fast in the prior art;
Fig. 4 is that MN utilizes FMIPv6 to realize the flowchart 2 that switches fast in the prior art;
Fig. 5 is the flow chart of Predictive pattern during FMIPv6 switches fast;
Fig. 6 is the flow chart of Reactive pattern during FMIPv6 switches fast;
Fig. 7 is a flow chart by the CARD agreement of MN triggering;
Fig. 8 is the flow chart of embodiment of the present invention one;
Fig. 9 is the flow chart of embodiment of the present invention two;
Figure 10 does not finish quick switching under the abnormal conditions, but adopts the flow chart of target preferable mechanism.
Embodiment
The newest research results of IETF tissues such as FMIPv6 and CARD agreement to mobile IP technology are merged in the present invention, and a kind of MN that proposes in conjunction with the concrete characteristics and the actual demand of mobile radio communication evolvement network spans into three layers of seamless switching solution of gateway, across a network.
Respectively FMIPv6 and CARD agreement are done simple introduction below:
(A) FMIPv6 will switch fast and be divided into two scenes:
Scene one, send FBU message and receive FBack (the quick binding acknowledgement of Fast BindingAcknowledgement) message at the PAR link as MN, with this scene called after " Predictive " pattern, its flow process as shown in Figure 5:
Step 502, PAR obtain information such as the IP address of new access point and network prefix by searching buffer memory or IPv6 neighbor discovery process, in conjunction with known MN link layer address, automatically dispose the IPv6 address that defines in (IPv6 Stateless Address Autoconfiguration) process by the IPv6 stateless and form mechanism and generate the NCoA that MN will use at NAR, inform the information such as IP address, link layer address, network prefix of its NCoA of MN, NAR by PrRtAdv message;
Message is to the NAR request or verify NCoA by HI (Handover Initiate switches initial) for step 504, PAR, and with the link layer address of MN and the NAR of PCoA announcement;
Step 506, PAR receive the Hack message of NAR, send FBack (Fast BindingAcknowledgement, binding acknowledgement fast) message to MN and since may this moment MN disconnected and being connected of PAR, just moving in the connection of NAR, so the two-way transmission of this message;
After step 508, MN are connected to new network, send its arrival and link layer address thereof of FNA (Fast NeighborAdvertisement, neighbor advertisement fast) message announcement to NAR immediately;
Scene two, when MN with just receive Fback message or newly initiate FBU after NAR is connected, this kind scene called after " Reactive " pattern then, its flow process as shown in Figure 6:
Step 602, PAR obtain information such as the IP address of new access point and network prefix by searching buffer memory or IPv6 neighbor discovery process, in conjunction with known MN link layer address, automatically dispose the IPv6 address that defines in (IPv6 Stateless Address Autoconfiguration) process by the IPv6 stateless and form mechanism and generate the NCoA that MN will use at NAR, inform the information such as IP address, link layer address, network prefix of its NCoA of MN, NAR by PrRtAdv message;
After step 604, MN are connected to new network, send its arrival and the link layer address thereof of FNA message announcement encapsulated FBU message to NAR immediately;
If step 605 NAR finds the NCoA of MN and is using when handling FNA message, then must abandon the FBU packet of encapsulation and send the advertising of route message that comprises NAACK (Neighbor AdvertisementAcknowledge, neighbor advertisement is replied) option and inform the NCoA that MN is new;
Step 606, MN bind NCoA and PCoA to make things convenient for PAR that data forwarding is arrived its NCoA by FBU;
(B) major function of CARD agreement realization:
B1, reverse address resolution: MN has obtained the link layer ID of new access point AP (for the IEEE802.11 network by monitoring on wireless channel before initiating the network layer switching, be MAC Address), CARD helps MN the link layer ID of these AP to be mapped to the IP address of the CAR (Candidate Access Router, candidate access router) that links to each other with these AP.In order to obtain the IP address of CAR, MN mails to current AR (Access Router, couple in router) with the link layer ID of new access point AP by MN-AR CARD Req message, and current AR shows the IP address of CAR is returned to MN by the CAR that inquires about self;
B2, discovery CAR ability: the ability information of obtaining all CAR can help MN to make best switching decision.MN asks current AR to return the ability information of CAR by the C-flag sign is set in MN-AR CARD Req message, if AR finds that its corresponding list item is about to or is expired, then send AR-AR CARD Req information and ask corresponding ability information, return to MN again to target CAR;
B3, CARD agreement also allow MN optionally to indicate its interested target CAR ability, and such as the characteristic of eating dishes without rice or wine, QoS ability etc., the current AR of MN can filter out the target CAR of optimization in advance with this information like this.
The flow chart of a CARD agreement that triggers by MN as shown in Figure 7, its step is as follows:
Step (1m), MN obtain link layer address or other CARD trigger conditions of the access point of new network;
Step (2m), MN send MN-AR CARD Req message request target access information to current AR;
Current AR inquiry self data in buffer table if do not have the target access information or the corresponding list item of request out of date, is then carried out following step (1a), (2a);
Step (3m), AR return target access information by MN-AR CARD Reply message to MN.
Step (1a), current AR ask its access-in point information by AR-AR CARD Req message to target CAR;
Step (2a), CAR return the access-in point information of request to AR by AR-AR CARD Reply message;
Be example with the CDMA2000 evolvement network below, in conjunction with the accompanying drawings, method provided by the invention is described further: prerequisite of the present invention is that following functional entitys such as MN, AGW/RRM are supported the quick switching of MIPv6 and the protocol suite and the CARD agreement of IETF regulation, and can correctly handle the various message in the quick switching of FMIPv6.
Fig. 8 is the flow chart of embodiment of the present invention one, and as shown in Figure 8, MN promptly binds NCoA fast at source network, and receives quick binding acknowledgement message, the steps include:
Just keeping conversation procedure between step 801, MN and the source network AGW/RRM1; Wherein, AGW/RRM1 is equivalent to above-mentioned PAR, and MN carries out session by AGW/RRM1 and CN;
For the access point link layer address, at cellular communication systems such as CDMA2000/UMTS/GSM, it is generally sectors/cells ID; For the IEEE802.11 system, it is the MAC Address of AP;
Each list item in the CAR tables of data all has corresponding life cycle value, and corresponding list item is out of date if MN has requirement to target AGW/RRM ability, then sends AR-AR CARD Req message request the other side's ability information; Be the ability information of AGW/RRM1 to AGW/RRM2 transmission AR-AR CARD Req message request the other side among the figure, wherein AGW/RRM2 is equivalent to above-mentioned NAR/CAR;
Step 805, AGW/RRM 1 be according to the switching target AGW/RRM 2 of the information decision MN of the one or more AGW/RRM that grasp, and according to the Address requests MN NCoA that needs use in AGW/RRM 2 of AGW/RRM 2, as asking to DHCP Server;
Step 806, DHCP Server need the NCoA that uses to what AGW/RRM 1 returned request in AGW/RRM 2, and this address of mark is assigned with;
Step 807, AGW/RRM 1 transmit the current session related information of MN to target AGW/RRM 2; This process needn't wait until that AGW/RRM 1 receives that replying of DHCP Server just begins to carry out, and has determined target AGW/RRM 2 backs of MN to take place to MN can initiate during this period of time before actual the switching at AGW/RRM 1; Its message name, form do not limit: both can send separately, and can send in same IP grouping with other message yet; Both can be a piece of news, also may be many interaction messages;
Step 809, MN send FBU (Fast Binding Update, Binding Update fast) message to AGW/RRM 1 and bind its NCoA address;
At this moment, MN disconnects and being connected of source network, and switches in the new network, AGW/RRM 1 will arrive and buffer memory to the packet of MN PCoA by and the tunnel of 2 of AGW/RRM before forward AGW/RRM 2 to;
The session related information that obtains in step 815, the AGW/RRM 2 usefulness steps 807 rebulids the session of MN.
In the above-mentioned steps, because concentrating by DHCP Server, network distributes CoA, and DHCPServer will bring in constant renewal in/safeguard address utilization, therefore the NCoA that distributes generation in new network probability invalid or that repeat is extremely low, MN binds its NCoA at switching generation prerequisite forward direction CN and can guarantee can use the routing optimality function of FMIPv6 to use NCoA successfully to send data to CN immediately after MN is switching to AGW/RRM 2 connections, compare the Binding Update that is initiated to CN after switching is finished again, such scheme has reduced handoff delay.
Fig. 9 is the flow chart of embodiment of the present invention two, and as shown in Figure 9, MN promptly loses after receiving PrRtAdv message and being connected of source network, and in new network binding NCoA fast, the steps include:
Just keeping conversation procedure between step 901, MN and the source network AGW/RRM1; Wherein, AGW/RRM1 is equivalent to above-mentioned PAR, and MN carries out session by AGW/RRM1 and CN;
For the access point link layer address, at cellular communication systems such as CDMA2000/UMTS/GSM, it is generally sectors/cells ID; For the IEEE802.11 system, it is the MAC Address of AP;
Each list item in the CAR tables of data all has corresponding life cycle value, and corresponding list item is out of date if MN has requirement to target AGW/RRM ability, then sends AR-AR CARD Req message request the other side's ability information; Be the ability information of AGW/RRM1 to AGW/RRM2 transmission AR-AR CARD Req message request the other side among the figure, wherein AGW/RRM2 is equivalent to above-mentioned NAR/CAR;
Step 905, AGW/RRM 1 be according to the switching target AGW/RRM 2 of the information decision MN of the one or more AGW/RRM that grasp, and according to the Address requests MN NCoA that needs use in AGW/RRM 2 of AGW/RRM 2, as asking to DHCP Server;
Step 906, DHCP Server need the NCoA that uses to what AGW/RRM 1 returned request in AGW/RRM 2, and this address of mark is assigned with;
Step 907, AGW/RRM 1 transmit the current session related information of MN to target AGW/RRM 2; This process needn't wait until that AGW/RRM 1 receives that replying of DHCP Server just begins to carry out, and has determined target AGW/RRM 2 backs of MN to take place to MN can initiate during this period of time before actual the switching at AGW/RRM 1; Its message name, form do not limit: both can send separately, and can send in same IP grouping with other message yet; Both can be a piece of news, also may be many interaction messages;
At this moment, the MN disconnection is connected with source network, and switches to go in the new network;
The session related information that obtains in step 913, the AGW/RRM 2 usefulness steps 907 rebulids the session of MN.
In the above-mentioned steps, because system distributes the CoA address by DHCP Server is concentrated, and DHCPServer will bring in constant renewal in/safeguard address utilization, and therefore the NCoA that distributes generation in new network probability invalid or that repeat is extremely low.
The beneficial effect that the present invention brings:
1) realized the switching problem of MN between different IADs in the FMIPv6 network;
2) as a rule, MN can both obtain the relevant information and the Care-of Address of target access gateway and be accomplished to the registration of CN before switching to new IAD, significantly reduced handoff delay, simultaneously after switching to target access gateway, former IAD will receive that by the tunnel packet that mails to the former Care-of Address of MN with buffer memory is forwarded to the current Care-of Address of MN, reduce the generation of packet loss, realized seamless switching;
3) former AGW/RRM equipment is about to its current session related information and is delivered to target AGW/RRM equipment before MN switches, and makes that MN can the new session of very fast recovery behind the new IAD of arrival;
4) realize the address of a plurality of optional target AGW/RRM is obtained and ability discovery by the CARD agreement, can better meet different terminals, different business, realize optimum switching selection demands such as network interface characteristic, QoS abilities;
5) the quick switching based on FMIPv6 is totally independent of carrying media and link layer information, has realized the quick switching of MN being suitable for the switching of MN between heterogeneous network in network layer.
In addition,, also can realize the general mobile IP switching flow of MN optimization aim access point by means of message format and the CARD agreement of the FMIPv6 of the invention described above, its flow process as shown in figure 10, step is:
Just keeping conversation procedure between step 1001, MN and the source network AGW/RRM1; Wherein, AGW/RRM1 is equivalent to above-mentioned PAR, and MN carries out session by AGW/RRM1 and CN;
For the access point link layer address, at cellular communication systems such as CDMA2000/UMTS/GSM, it is generally sectors/cells ID; For the IEEE802.11 system, it is the MAC Address of AP;
Each list item among the CAR Table all has corresponding life cycle value, and corresponding list item is out of date if MN has requirement to target AGW/RRM ability, then sends AR-AR CARD Req message request the other side's ability information; Be the ability information of AGW/RRM1 to AGW/RRM2 transmission AR-AR CARD Req message request the other side among the figure, wherein AGW/RRM2 is equivalent to above-mentioned NAR/CAR;
Step 1005, AGW/RRM 1 be according to the switching target AGW/RRM 2 of the information decision MN of the one or more AGW/RRM that grasp, and according to the Address requests MN NCoA that needs use in AGW/RRM 2 of AGW/RRM 2, as asking to DHCP Server;
Step 1006, DHCP Server need the NCoA that uses to what AGW/RRM 1 returned request in AGW/RRM 2, and this address of mark is assigned with;
Step 1007, AGW/RRM 1 transmit the current session related information of MN to target AGW/RRM 2; This process needn't wait until that AGW/RRM 1 receives that replying of DHCP Server just begins to carry out, and has determined target AGW/RRM 2 backs of MN to take place to MN can initiate during this period of time before actual the switching at AGW/RRM 1; Its message name, form do not limit: both can send separately, and can send in same IP grouping with other message yet; Both can be a piece of news, also may be many interaction messages;
MN disconnects with source network before receiving the PrRtAdv message that AGW/RRM 1 sends, and switches to go in the new network;
Step 1009, MN receive the advertising of route message that carries its NCoA that AGW/RRM 2 sends;
The session related information that obtains in step 1014, the AGW/RRM 2 usefulness steps 1007 rebulids the session of MN.
Above-mentioned steps 1001-1014 uses the message format of FMIPv6 and can conveniently realize the network equipment is carried out unified Message Processing and exploitation, can realize the optimization mechanism of MN target access, but the quick switching of the FMIPv6 of the MN of being unrealized.
The above only be the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto; this programme is given an example with the CDMA2000 evolvement network, but is equally applicable to the communication network that other use mobile IP technologies, as the WCDMA network after the evolution; WLAN, WiMAX etc.The BTS that mentions in embodiment of the present invention and the accompanying drawing can be thought WAP (wireless access point), AP of various wireless access technologys etc. in addition, AGW/RRM is thought concrete function entities such as medium IAD/radio resource managing unit in the corresponding network; This programme is absorbed in the fast handover procedures of mobile node network layer between different IADs, and that mentions in the scheme closes on the sectors/cells that sectors/cells all refers to different AGW/RRM management; Anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (20)
1. the implementation method that target optimum selecting three-layer switches fast in the evolvement network is characterized in that: portable terminal MN promptly obtains the access information of target access network at source network, comprises step:
(1) MN sends RtSolPr information reporting source medium IAD/RRM AGW/RRM functional entity after switching condition reaches;
(2) source AGW/RRM determines the switching target AGW/RRM of MN according to the content in the RtSolPr message, and obtains the new Care-of Address NcoA that MN uses in target AGW/RRM;
(3) source AGW/RRM sends PrRtAdv message to MN and informs its access information at target AGW/RRM;
(4) MN binds its NcoA to source AGW/RRM;
(5) MN binds its NcoA to Correspondent Node CN;
(6) target AGW/RRM rebulids the session of MN.
2. the method for claim 1 is characterized in that: the described switching condition of step (1) is to detect one or more to have WAP (wireless access point) than strong waveguide frequency signal.
3. the method for claim 1 is characterized in that: comprise link layer address, pilot frequency intensity or the MN of the target access Capability Requirement information to the switching target access point in the described RtSolPr message of step (1).
4. method as claimed in claim 3 is characterized in that: described link layer address is sectors/cells ID.
5. the method for claim 1 is characterized in that: comprise MN-AR CARD Req message in the described RtSolPr message of step (1).
6. method as claimed in claim 4 is characterized in that: the described source AGW/RRM of step (2) comprises step according to the switching target AGW/RRM of the decision of the content in RtSolPr message MN:
Source AGW/RRM obtains IP address, the ability information of target AGW/RRM according to the content in the RtSolPr message by the sectors/cells ID inquiry CAR tables of data of target access;
Source AGW/RRM is according to the switching target AGW/RRM of the information decision MN of one or more AGW/RRM that grasps.
7. method as claimed in claim 6 is characterized in that: when MN has requirement to the ability of target AGW/RRM, and corresponding list item comprises step when out of date:
Source AGW/RRM sends AR-AR CARD Req message request the other side's ability information to target AGW/RRM;
Target AGW/RRM replys its ability information of AR-AR CARD Reply message announcement.
8. the method for claim 1 is characterized in that: the described source AGW/RRM of step (2) obtains the new Care-of Address NcoA that MN uses and comprises step in target AGW/RRM:
The new Care-of Address NcoA that source AGW/RRM uses in target AGW/RRM to DHCP Server request MN according to the address of target AGW/RRM;
DHCP Server is assigned with this address of tense marker to the NcoA that source AGW/RRM returns request.
9. method as claimed in claim 5 is characterized in that: comprise MN-AR CARD Reply message in the described PrRtAdv message of step (3).
10. the method for claim 1, it is characterized in that: the described MN of step (3) comprises the IP address of target AGW/RRM, the link layer address of access point and the NCoA of MN at the access information of target AGW/RRM.
11. the method for claim 1 is characterized in that: also comprise step behind the switching target AGW/RRM of the described source AGW/RRM of step (2) according to the decision of the content in RtSolPr message MN:
Source AGW/RRM transmits the current session related information of MN to target AGW/RRM.
12. the method for claim 1 is characterized in that: the described MN of step (4) binds its NcoA to source AGW/RRM and comprises step:
MN sends quick Binding Update FBU message to source AGW/RRM and binds its NcoA;
Source AGW/RRM sends to target AGW/RRM and switches initial HI message, NCoA, the former Care-of Address PCoA of announcement MN, link layer address information;
Target AGW/RRM sends to switch to source AGW/RRM and confirms the response message of Hack message as HI;
After source AGW/RRM receives the Hack message of target AGW/RRM, send quick binding acknowledgement FBack message to MN.
13. method as claimed in claim 12 is characterized in that: source AGW/RRM also comprises step after MN sends FBack message:
MN switches into target access network, source AGW/RRM will arrive and buffer memory to the packet of MN PCoA by and target AGW/RRM between the tunnel before forward MN to.
14. the method for claim 1 is characterized in that: the described MN of step (5) binds its NcoA to CN and comprises step:
MN sends Binding Update BU message to CN and binds its NCoA;
CN replys binding acknowledgement BACK message to MN.
15. the method for claim 1 is characterized in that: also comprise step:
After MN switches target access network, send its arrival and link layer address of quick neighbor advertisement FNA message announcement, inform that target AGW/RRM will newly arrive with cached data packet to be transmitted to MN by the NCoA address to target AGW/RRM.
16. method as claimed in claim 11 is characterized in that: the session that the described target AGW/RRM of step (6) rebulids MN is that target AGW/RRM utilizes the current session related information of MN of described transmission to be established to the session of MN.
17. the method for claim 1 is characterized in that: the described source AGW/RRM of step (3) also comprises step after MN transmission PrRtAdv message is informed the access information of its target AGW/RRM:
MN switches in the new network, sends its use of arrival, link layer address and NCoA of FNA message announcement encapsulated FBU message to target AGW/RRM.
18. method as claimed in claim 17 is characterized in that: the described MN of step (4) binds its NcoA to source AGW/RRM and comprises step:
MN sends FBU message by target AGW/RRM to source AGW/RRM and binds its NcoA;
Source AGW/RRM sends FBack message to MN.
19. method as claimed in claim 17 is characterized in that: the described MN of step (5) binds its NcoA to CN and comprises step:
MN sends BU message by target AGW/RRM to CN and binds its NCoA;
CN replys BACK message to MN.
20. method as claimed in claim 18 is characterized in that: described source AGW/RRM also comprises step after MN sends FBack message:
Source AGW/RRM will arrive and buffer memory to the packet of MN PCoA by and target AGW/RRM between the tunnel before forward MN to.
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| CNA2006100713288A CN101043727A (en) | 2006-03-24 | 2006-03-24 | Method for realizing target optimum selecting three-layer fast switching in evolvement network |
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