CN101232698B - Terminal, system and method for reducing switch time delay - Google Patents
Terminal, system and method for reducing switch time delay Download PDFInfo
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- CN101232698B CN101232698B CN2007100027061A CN200710002706A CN101232698B CN 101232698 B CN101232698 B CN 101232698B CN 2007100027061 A CN2007100027061 A CN 2007100027061A CN 200710002706 A CN200710002706 A CN 200710002706A CN 101232698 B CN101232698 B CN 101232698B
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Abstract
The invention discloses a method, a system and a terminal for shortening the time delay in switch. The method comprises the following steps: a network generates a new care-of address for the terminal and sends to the terminal an instruction that a switch of network layer is required, and the new care-of address or information used for generating another new care-of address; the new care-of address is used for carrying out the network layer switch after the terminal receives the instruction that the network layer switch is required, or another new care-of address is generated using the information for generating another new care-of address, and the newly generated care-of address is used for carrying out network layer switch. In addition, the invention provides the system and the terminal for shortening the time delay in switch and has the advantages that the invention can reduce the time delay of the terminal in the network layer switch and can realize the interconnection of one terminal with a plurality of access routers.
Description
Technical field
The present invention relates to the handoff technique of wireless MAN, relate in particular to the method and system and the terminal that shorten handover delay.
Background technology
Whole world access microwave interoperability (WiMAX, Worldwide Interoperability for MicrowaveAccess) be a kind of Overview of wireless MAN technologies based on IEEE 802.16 standards, with reference to Fig. 1, the WiMAX network mainly comprises client (MSS/SS, Mobile Subscriber Station/Subscriber Station), access service network (ASN, Access Service Network) and connection service network (CSN, ConnectivitySevice Network) three parts, wherein, the R1 interface is air wireless interface, described interface mainly provides the linkage function of physical layer and link layer, and terminal is to connect the base station by this interface; Interface R3 is the coffret in ASN and the CSN network, and described interface provides the linkage function of terminal network layer, and the ASN network is by Interface R3 and CSN network interconnection.
Client is mobile subscriber equipment, the user uses described devices accessing WiMAX network, mobile Internet Protocol sixth version (IPv6, IP version 6) so that mobile subscriber equipment can keep original IP connection not interrupt when moving between different access router (AR, Access Router).
When mobile subscriber equipment switches to another couple in router from a couple in router, can not receive and send packet for some time, be called during this period of time handover delay.Handover delay comprises the handover delay of link layer and the handover delay of network layer, wherein, the handover delay of network layer depends on network layer Move Detection, new Care-of Address (NCoA, New Care-of Address) configuration and Mobile IP (MobileIP) Binding Update time, handover delay with respect to link layer, the handover delay of network layer is longer, and this time delay is unacceptable for real time business.
The network layer changing method that prior art one provides a kind of fast mobile terminal to cause, with reference to Fig. 2, described method comprises:
After step 201, fast mobile terminal caused the ASN handoff procedure to be finished, target access service network gateway (TargetASN-GW) was initiated network layer handover request message to anchor access service network gateway (Anchor ASN-GW).
Step 202, anchor ASN-GW send switching response message, the R3 contextual information of carried terminal in the described message to target ASN-GW.
Step 203, target ASN-GW send router broadcast (RA, Router Advertisement) message and inform the new couple in router of terminal (AR, Access Router) information.
Step 204, terminal are obtained new Care-of Address, and necessary address conflict is carried out in described address detect (DAD, Duplicate Address Detection), wherein, new Care-of Address can be that terminal generates with stateless according to the network prefix in the AR information and interface identifier own, also can be to obtain new Care-of Address by DHCP (DHCP, Dynamic Host Configuration Protocol).
Step 205～step 206, terminal send binding update messages and home agent (HA, Home Agent) or other communication node (CN, Corresponding Node) carry out Binding Update, home agent sends binding acknowledgement message indication Binding Update to terminal and finishes.
Step 207, target ASN-GW send switch acknowledgment message to anchor ASN-GW, inform that anchor ASN-GW terminal finishes in the switching of network layer.
Step 208, alternatively, if the data channel between presence service ASN-GW and the anchor ASN-GW before, then anchor ASN-GW discharges described data channel after receiving switch acknowledgment message.
The network layer changing method that prior art two provides a kind of resource optimization to cause, with reference to Fig. 3, described method comprises:
Step 301, anchor ASN-GW initiate network layer handover request message, the R3 contextual information of carried terminal in the described message to service ASN-GW.
Step 302, service ASN-GW send switching response message to anchor ASN-GW.
Step 303, service ASN-GW send router broadcast message and inform the information of access route that terminal is new.
Step 304, terminal are obtained new Care-of Address, and necessary address conflict is carried out in described address detect, wherein, new Care-of Address can be that terminal generates with stateless according to the network prefix in the AR information and interface identifier own, also can be to obtain new Care-of Address by DHCP.
Step 305～step 306, terminal send binding update messages and home agent or other communication node and carry out Binding Update, and home agent sends binding acknowledgement message indication Binding Update to terminal and finishes.
Step 307, service ASN-GW send switch acknowledgment message to anchor ASN-GW, inform that anchor ASN-GW terminal finishes in the switching of network layer.
After step 308, anchor ASN-GW receive switch acknowledgment message, discharge the data channel between anchor ASN-GW and the service ASN-GW.
Above-mentioned two kinds of prior aries all are based on mobile Internet Protocol (MIP, Mobile IP) handover scheme, prior art one is the network prefix of just obtaining after terminal switches to target ASN-GW in the AR information, follow the new Care-of Address of regeneration, then as required address conflict is carried out in described address and detect, last terminal is initiated the Binding Update process that the MIP binding message is finished home agent and other communication node.Similarly, prior art two also is just to dispose new Care-of Address after terminal switches to service ASN-GW, and then address conflict is carried out in described address detect.
Because above-mentioned two kinds of prior aries all are to carry out just disposing the NCoA address when network layer is switched in terminal, again address conflict are carried out in described address and detect, whole process can cause the handoff delay of network layer migration long.In addition, when terminal is carried out the Mobile IP Binding Update, the peer processes entity of its binding message is terminal and home agent or other communication node, couple in router is not processed, therefore, couple in router can't be known the indication that the Mobile IP Binding Update is finished, and also just can't finish the subsequent treatment behind the Binding Update, such as resource release etc.At last, above-mentioned two kinds of prior aries just think that need to carry out network layer switches as long as terminal is received the RA message that new AR sends, and prerequisite is that a terminal only interconnects with an AR.When terminal and a plurality of AR interconnection, if have new AR to connect up and sent RA message, this moment, terminal still was connected unobstructed with original AR, and existing network layer Move Detection method can make terminal take for network layer need to switch and cause mistake to be switched, thereby IP operation is affected, the simultaneously development of wireless network the base station will inevitably occur and be shared by a plurality of AR, even present netted interconnection structure between base station and the AR, therefore this network layer Move Detection method is unfavorable for the development of follow-up wireless network.
Summary of the invention
The embodiment of the invention provides a kind of method and system and terminal that shortens handover delay, and the method and system can reduce terminal at the handover delay of network layer.
The embodiment of the invention provides a kind of method that shortens handover delay, and the method comprises:
Network side is that terminal generates new Care-of Address, and sends to terminal and need to carry out the indication that network layer is switched, and described new Care-of Address or be used for generating the information of new Care-of Address;
After terminal receives that described needs carry out the indication of network layer switching, utilizing described new Care-of Address to carry out network layer switches, perhaps according to the new Care-of Address of described Information generation be used to generating new Care-of Address, the new Care-of Address that recycles described generation carries out network layer and switches.
According to said method, the embodiment of the invention also provides a kind of system that shortens handover delay, and this system comprises:
Network equipment is used to terminal to generate new Care-of Address, and sends to terminal and need to carry out the indication that network layer is switched, and new Care-of Address or be used for generating the information of new Care-of Address; With
Terminal, be used for obtaining new Care-of Address from network equipment, perhaps obtain be used to the information that generates new Care-of Address, and according to the new Care-of Address of Information generation that is used for generating new Care-of Address, and when carrying out the indication of network layer switching, the needs of receiving the network equipment transmission utilize described new Care-of Address to carry out the network layer switching.
In addition, the embodiment of the invention also provides a kind of terminal, and wherein, this terminal comprises:
Acquiring unit is used for obtaining new Care-of Address, perhaps obtains be used to the information that generates new Care-of Address and according to the new Care-of Address of described Information generation;
Switch unit is used for when receiving the indication that need to carry out the network layer switching, utilizes described new Care-of Address to carry out network layer and switches.
Above technical scheme can be found out, because the embodiment of the invention is before terminal receives that the needs of network side transmission carry out the indication of network layer switching, the terminal information of carrying out network layer and just generating new Care-of Address for terminal before switching or being provided for generating new Care-of Address for terminal namely, and then the new Care-of Address that utilizes the new Care-of Address receive or terminal to generate carries out network layer and switches, compared with prior art, the embodiment of the invention has avoided terminal to dispose new Care-of Address or obtain the time delay that causes be used to the information that generates new Care-of Address when carrying out the network layer switching, thereby can reduce terminal at the handover delay of network layer, and then reduce terminal enters another couple in router from a couple in router whole handover delay.
Description of drawings
Fig. 1 is the schematic diagram of prior art WiMAX network;
Fig. 2 is the flow chart of prior art one;
Fig. 3 is the flow chart of prior art two;
Fig. 4 is the flow chart of the embodiment of the invention one;
Fig. 5 is the flow chart of the embodiment of the invention two;
Fig. 6 is the schematic diagram of the embodiment of the invention three;
Fig. 7 is the schematic diagram of the embodiment of the invention four;
Fig. 8 is the schematic diagram of the embodiment of the invention five.
Embodiment
The embodiment of the invention provides a kind of method and system that shortens handover delay, can understand better the present invention for making those skilled in the art, is elaborated below in conjunction with the technical scheme of accompanying drawing to the embodiment of the invention.
Embodiment one
Present embodiment is introduced internetwork layer that fast mobile terminal causes and is switched and be how to reduce the network layer handover delay.The configuration time delay of network layer handover delay=network layer Move Detection time delay+new Care-of Address+MIP Binding Update time delay, if reduce respectively configuration time delay and the MIP Binding Update time delay of network layer Move Detection time delay, new Care-of Address, will reduce so terminal at the handover delay of network layer.
It is by reduction network layer Move Detection time delay and new care-of address configuration time delay that fast mobile terminal causes network layer to be switched, and avoids MIP Binding Update time delay and reduce terminal at the handover delay of network layer.When causing network layer to be switched, at first can pass through fast mobile terminal the handoff procedure of the link layer of eating dishes without rice or wine of terminal itself, network side is the new Care-of Address of terminal configuration and described new Care-of Address is done address conflict detect in the handoff procedure of link layer of eating dishes without rice or wine, so just avoid terminal to dispose again new Care-of Address after network layer is switched and new Care-of Address is DAD detects carrying out, thereby avoided the configuration of new Care-of Address and collision detection and the time delay that causes.In addition, terminal does not need whether have new AR transmission router broadcast message to carry out the network layer Move Detection by detecting, but inform by the switching indication that network side is initiated whether terminal needs to carry out network layer and switch, thereby the time delay of having avoided the network layer Move Detection and having caused has also avoided terminal to connect the mistake migration problem that a plurality of AR cause simultaneously.At last, terminal continue to be used old Care-of Address to keep original IP operation to connect before the MIP Binding Update is finished, and terminal is after again networking under the new AR like this, and the MIP Binding Update is front just can transceiving data, thereby has avoided the problem of MIP Binding Update time delay.
With reference to Fig. 4, Fig. 4 is the flow chart of the embodiment of the invention one, and described execution mode is to be switched by the network layer that fast mobile terminal causes, and specifically may further comprise the steps:
The consular district broadcast (MOB_NBR-ADV) that step 401, terminal send by BS is obtained the Base Station Identification (BSID, Base Station Identifier) of one or more neighbor base stations.
In addition, terminal also can scan by the consular district Base Station Identification (BSID, Base Station Identifier) that (Scanning) process obtains one or more neighbor base stations.
Whether the neighbor base station identification list that step 402, terminal retrieval obtain has the AR information of preserving the ASN-GW that is connected with described base station, if, terminal continues to preserve corresponding information of access route, otherwise send the AR information of the required one or more base stations of message request to anchor ASN-GW, execution in step 403 again, for example, use router solicitation agency (RtSolPr, Router Solistation Proxy) message is obtained AR message, wherein, RtSolPr message is carried the BSID tabulation that needs request.
After step 403, Anchor ASN-GW receive the request message of terminal, the AR that asks is informed terminal; Also can be that AnchorASN-GW is periodically with the information notification terminal of its adjacent AR.Wherein, the AR information of Anchor ASN-GW can be in advance pre-configured or obtained before these AR information.For example, Anchor ASN-GW sends agent router broadcast (PrRtAdv, ProxyRouter Advertisement) to terminal, and the AR information of carried terminal request in PrRtAdv message; If Anchor ASN-GW does not have these AR information, then Anchor ASN-GW also needs the assistance of other entity of network side to obtain these AR information, and then informs terminal.Wherein, comprise one or more in link layer address, IP address and the network prefix of the AR interface that connects BS in the AR information.
Step 404～step 406, terminal are to serving BS (SBS, Serving BS) initiates handover request (MOB_MSHO-REQ) message, described message sends to anchor ASN-GW by SBS and service ASN-GW again, wherein, handoff request message is drawn together one or more target BS (TBS, Target BS) tabulation.
Step 407, anchor ASN-GW send handover request message to all candidates' target ASN-GW, if anchor ASN-GW this moment determines the network layer migration, then carry the NCoA address or be used for generating the terminal local interface sign of NCoA address in handover request message.
Alternatively, the embodiment of the invention also can be by the target ASN-GW transmission handover request message of service ASN-GW to all candidates, determine the network layer migration if serve ASN-GW at this moment, then in handover request message, carry the NCoA address or identify IID for the terminal local interface that generates the NCoA address.
Alternatively, if being target ASN-GW, the migration of described network layer determines that then target ASN-GW also needs to anchor ASN-GW or serves the terminal local interface sign that ASN-GW obtains the NCoA address or is used for generating the NCoA address.
Wherein, to be anchor ASN-GW or service ASN-GW or target ASN-GW generate or according to DHCP or mobile IP registration agreement the state generation arranged according to the network prefix of the local interface sign (IID, Interface ID) of terminal and the target AR information stateless by standard in described NCoA address.
Step 408～step 409, target ASN-GW send handover request message to TBS, and then TBS sends handoff response (MOB_BSHO-RSP) message to target ASN-GW.
After step 410, target ASN-GW receive switching response message, if accept handover request, then do address conflict according to the NCoA address of carrying in the request message and detect, and testing result is carried at informs anchor ASN-GW in the switching response message.If the address clashes, illustrate that NCoA is used in target ASN-GW, then target ASN-GW redistributes new Care-of Address NCoA ', and NCoA ' sent to anchor ASN-GW by switching response message, if not clashing, the address carries NCoA to anchor ASN-GW by switching response message.
In addition, in order to guarantee the integrality of data, this stage anchor ASN-GW can be pre-established and target ASN-GW between data channel (DP, data-path), anchor ASN-GW did not send packet to target ASN-GW immediately after DP set up, and current packet still continues to send to service ASN-GW.
Step 411～step 413, anchor ASN-GW send switching response message to terminal by service ASN-GW and SBS.
In addition, service ASN-GW directly sends switching response message to terminal by SBS.
Step 414, terminal send to SBS switches indication (MOB_HO-IND) message, if do not carry any target BS sign in the switch indicating information or clearly indicate handover cancelling or the refusal switching, then execution in step 415, if terminal has been carried selected TBS or clear and definite indication message in switch indicating information, then execution in step 419.
Step 415, SBS send handover cancelling (HO-Cancel) message to service ASN-GW.
Step 416～step 418, send handover cancelling message to target BS TBS by anchor ASN-GW and target ASN-GW, handoff preparation phase was all resources of terminal distribution before SBS, anchor ASN-GW, target ASN-GW and TBS received and discharge after the handover cancelling message, such as preallocated NCoA address etc., handoff procedure so far finishes.
Step 419, SBS receive that the backward service of switch indicating information ASN-GW sends switching and confirms (HO-Confirm) message.
Step 420, service ASN-GW send to switch to anchor ASN-GW and confirm (HO-Confirm) message, anchor ASN-GW stops the forwarding data to service ASN-GW after receiving switch acknowledgment message, and the downlink data of terminal is forwarded to target ASN-GW, all data of the described terminal of target ASN-GW buffer memory.
Anchor ASN-GW sends network layer switching indication FBack message to terminal after receiving switch acknowledgment message, described message is carried and need to be carried out network layer switching indication, judge the information of whether carrying new Care-of Address in the described message or being used for generating new Care-of Address, if do not carry new Care-of Address in the described message or be used for generating the information of new Care-of Address, terminal receives that the AR information stateless that connects according to the TBS that preserves in advance after the network layer switch indicating information generates the NCoA address.Wherein, stateless generates the NCoA address and refers to utilize the information method according to the rules of AR information and terminal itself to generate the NCoA address, usually generate new Care-of Address according to the network prefix of AR information and the link-local interface identifier of terminal oneself according to stateless, it is identical with the method that terminal generates the NCoA that new Care-of Address and Anchor ASN-GW replace terminal to generate, so the time terminal generate the NcoA address and replace terminal to generate with Anchor ASN-GW and the NCoA address of asking to be DAD is identical.
Before this, need to send FBack message to service ASN-GW and target ASN-GW simultaneously, service ASN-GW and target ASN-GW send described message to serving BS and target BS respectively again, to prevent owing to moving velocity of terminal moves under the objective network and the network re-entry network too quickly.
Step 421～step 422, anchor ASN-GW send to switch to target ASN-GW and confirm (HO-Confirm) message, and target ASN-GW will switch affirmation (HO-Confirm) message again and send to TBS.
Alternatively, directly send switch acknowledgment message by service ASN-GW to target ASN-GW.
Step 423, fast mobile terminal carry out network to TBS and reentry the connection of setting up link layer.
Step 424, alternatively, after terminal is carried out the network reentry, target ASN-GW determines to carry out the network layer switching or receives before and will carry out the indication that network layer is switched, the network layer of perhaps not receiving self terminal before the target ASN-GW connects Indication message, for example neighbours broadcast (FNA fast, FastNeighborAdvertisement) message, received that perhaps network layer connects Indication message but need to redistribute the CoA address to terminal, then the AR among the target ASN-GW initiatively sends the AR that router broadcast message informs that terminal is served for it and changes, wherein, carry and to carry out the indication that network layer is switched, go back the new Care-of Address of portability or be used for generating the target AR information of new Care-of Address.If terminal was not received FBack message before, then terminal is received execution in step 425 after this message, otherwise can ignore this routing broadcast message.
Step 425, terminal need to carry out sending when network layer is switched quick neighbours' broadcasting (FNA, FastNeighbor Advertisement) message indicating target ASN-GW sends the data of buffer memory get off, terminal continues to use old Care-of Address (PCoA simultaneously, Previous CoA) transceiving data bag, so far network layer connection is set up.
Step 426, terminal use new Care-of Address to carry out the heavily binding of MIP, described binding procedure comprises the Binding Update of heavily binding of MIP, terminal and other CN of terminal and HA, finish CN or the HA of MIP Binding Update, can communicate with the new Care-of Address that terminal is used.
After step 427, all MIP Binding Updates are finished, terminal is finished to target ASN-GW or anchor ASN-GW transmission FNA message indication MIP Binding Update, target ASN-GW or anchor ASN-GW initiate the data channel tunnel dispose procedure of R4 between target ASN-GW and anchor ASN-GW, terminal discharges old CoA address and the context relevant with described address simultaneously, anchor ASN-GW discharges the relevant context of terminal of its maintenance, and so far fast moving IP handoff procedure is finished.
Embodiment two
Present embodiment is introduced network layer that network resource optimization causes and is switched and be how to reduce the network layer handover delay.Equally, network layer handover delay=network layer Move Detection time delay+NCoA address configuration time delay+MIP Binding Update time delay, if reduce respectively network layer Move Detection time delay, NCoA address configuration time delay and MIP Binding Update time delay, will reduce so the handover delay of whole network layer.
Network layer that network resource optimization causes is switched is by reducing network layer Move Detection time delay and NCoA address configuration time delay, and avoids MIP Binding Update time delay and reduce the network layer handover delay.When network resource optimization causes network layer to be switched, terminal is not mobile, thereby there is not link layer handover procedure yet, therefore needing by the mutual of network side entity before network side is initiated the network layer switching initiatively is that terminal configuration is served the new Care-of Address that is about to use among the ASN-GW fortunately, and be in advance DAD and detect, configuration and DAD by the NCoA address when having avoided like this network layer switching occurs detect caused time-delay; In addition, the network layer switching that network resource optimization causes is initiatively initiated by network side, whether need not terminal has new AR transmission router broadcast message to carry out the network layer Move Detection by detecting, but the switching of initiating by network side after network side is ready to NCoA address indication informs that terminal need to initiate network layer and switch, and has also avoided terminal to connect the mistake migration problem that a plurality of AR cause simultaneously thereby reduced total network layer handover delay.Simultaneously, terminal continues to use old CoA address to keep original IP operation connection before the MIP Binding Update is finished, terminal is after again networking under the new AR like this, just can transceiving data before the MIP Binding Update is finished, thus avoided the problem of MIP Binding Update time delay.
With reference to Fig. 5, Fig. 5 is the flow chart of the embodiment of the invention two, and described execution mode is to be switched by the network layer that network resource optimization causes, and specifically may further comprise the steps:
Step 501, anchor ASN-GW prepare to carry out the network layer switching that the network side resource optimization causes.
This step also because the network side resource optimization is served ASN-GW and prepared to carry out the network layer switching, is served ASN-GW and is sent network layer handover request message to anchor ASN-GW, asks to carry out network layer and switches.
Step 502, anchor ASN-GW send message to service ASN-GW, carry indication and the new Care-of Address that need to carry out the network layer switching or the terminal local interface sign (IID, Interface ID) that is used for generating new Care-of Address in the described message.
Alternatively, anchor ASN-GW receives the network layer handover request message from service ASN-GW, sends the message of carrying indication and the new Care-of Address that need to carry out the network layer switching or being used for generating the terminal local interface sign of new Care-of Address to service ASN-GW again.
Step 503, service ASN-GW receive switch indicating information, directly use new Care-of Address that anchor ASN-GW provides or according to the network prefix of its administration subnet and the IID information of receiving, be that terminal generates the NCoA address according to the stateless address generating mode, and carry out DAD and detect; If new service ASN-GW does not allow to use stateless address generating forwarding address or address conflict, then serve ASN-GW and again be terminal distribution NCoA address.
Step 504, service ASN-GW send handoff response (R3_Relocation.Rsp) message to anchor ASN-GW.
Step 505, service ASN-GW send RA message to terminal and inform the AR information that terminal is new, carry network layer switching indication, new Care-of Address in the described message or are used for generating the AR information of new Care-of Address and the indication whether new Care-of Address has finished the DAD detection.Wherein, there are not the sequencing relation in step 504 and step 505.
Step 506, terminal are initiated the MIP binding update messages, finish the Binding Update process with HA or other CN.Before all Binding Updates were not finished, terminal was still used the PCoA address, still used the PCoA address to communicate to the CN that does not carry out Binding Update, and the CN that has carried out Binding Update then can use the NCoA address to communicate.
Step 507, home agent send the message authentication Binding Update to terminal and finish.
Step 508, terminal discharge old Care-of Address and the context relevant with described address, and send FNA message indication MIP Binding Update to anchor ASN-GW or service ASN-GW and finish, wherein, quick Binding Update (FBU, the FastBinding Updata) message of indication binding lifetime=0 is being carried in encapsulation in the FNA message.
After step 509, anchor ASN-GW or service ASN-GW receive FNA message, initiate the R4 tunnel dispose procedure between anchor ASN-GW and service ASN-GW, so far fast moving IP handoff procedure is finished.
By above-mentioned two embodiment as can be known, the new Care-of Address that carries in handover request is the stateless replacement terminal generation that network side passes through standard.In addition, for the new Care-of Address of terminal configuration can generate by condition mode is arranged, for example pass through DHCP (DHCP, Dynamic HostConfiguration Protocol) or mobile IP registration agreement there to be condition mode to generate new Care-of Address.
Embodiment three
The method execution mode that the network layer that causes according to fast mobile terminal is switched, embodiments of the invention three provide a kind of system that shortens handover delay, and as shown in Figure 6, described system comprises terminal 601 and network equipment 602.
Wherein, terminal 601 is used for obtaining contiguous Base Station Identification, and retrieves described neighbor base station sign and whether have connected AR information, and sends the required AR information of message request to network equipment 602 when not having connected AR information; For example, use router solicitation agency (RtSolPr, RouterSolistation Proxy) message to obtain AR message, wherein, RtSolPr message is carried the BSID tabulation.
Wherein, network equipment 602 comprises:
Anchor access service network gateway 603 is used to terminal 601 to generate new Care-of Address, sends the handover request message of carrying described new Care-of Address to target access service network gateway 604 again.Usually, anchor access service network gateway 603 is to generate new Care-of Address according to the network prefix of terminal 601 local interfaces signs and the AR information stateless by standard, in addition, for the NCoA address of terminal configuration can generate by condition mode is arranged, for example there is state to generate new Care-of Address by DHCP (DHCP, Dynamic Host ConfigurationProtocol) or mobile IP registration agreement.
Target access service network gateway 604, being used for that the new Care-of Address that anchor access service network gateway 603 sends is done address conflict detects, and when not clashing in the address with described new Care-of Address with need to carry out the indication that network layer switches and send to terminal 601, and again distribute new Care-of Address for terminal 601 when clashing in the address, the new Care-of Address that will redistribute again and need to carry out the indication that network layer switches and send to terminal 601.
Present embodiment is to generate new Care-of Address by anchor access service network gateway 603, in addition, can also be provided for generating by anchor access service network gateway 603 information of access route and terminal 601 information of new Care-of Address to target access service network gateway 604, the described information that target access service network gateway 604 recycling anchor access service network gateways 603 provide generates new Care-of Address with stateless, in addition, can directly be the new Care-of Address of terminal distribution by DHCP or mobile IP registration agreement also.
Embodiment four
The method execution mode that the network layer that causes according to network resource optimization is switched, embodiments of the invention four also provide a kind of corresponding system, and as shown in Figure 7, described system comprises terminal 701 and network equipment 702.
Wherein, terminal 701 comprises for obtaining new Care-of Address from network equipment 702, perhaps obtain be used to the information that generates new Care-of Address from network equipment 702, for example, information of access route, basis generates new Care-of Address for the information that generates new Care-of Address with stateless again, and utilizes described new Care-of Address to carry out the network layer switching when the needs of receiving network equipment 702 transmissions carry out the indication of network layer switching.
Wherein, network equipment 702 comprises:
Anchor access service network gateway 703 is used for sending the indication that need to carry out the network layer switching and terminal 701 information that are used for generating new Care-of Address, for example local interface sign (IID, Interface ID) to service access service network gateway 704.
Service access service network gateway 704, being used for according to terminal 701 information is that terminal 701 generates new Care-of Address, and described new Care-of Address is done address conflict detect, and described new Care-of Address is sent to terminal 701 when not clashing in the address, and again distribute new Care-of Address for terminal 701 when clashing in the address, again the address of redistributing is sent to terminal 701, perhaps send the information of access route that is used for generating new Care-of Address to terminal 701.Wherein, service access service network gateway 703 is to generate new Care-of Address according to the network prefix of the local interface of terminal 701 sign and the AR information stateless by standard, in addition, for the new Care-of Address of terminal configuration can generate by condition mode is arranged, for example obtain new Care-of Address by DHCP or mobile IP registration agreement.
In addition, service access service network gateway 704 sends the message of carrying new Care-of Address to anchor access service network gateway 703, and send the RA message to terminal 701 and inform the AR information that terminal is new, carry the indication that need to carry out network layer and switch, new Care-of Address and new Care-of Address in the described message and whether finished the indication that DAD detects.
Similarly, present embodiment also can generate new Care-of Address by anchor access service network gateway 703.
Embodiment five
The embodiment of the invention also provides a kind of terminal, and as shown in Figure 8, this terminal comprises acquiring unit 801, switch unit 802 and releasing unit 805.
Wherein, acquiring unit 801 is used for obtaining new Care-of Address, perhaps obtains be used to the information that generates new Care-of Address and according to the new Care-of Address of described Information generation.
Wherein, switch unit 802 comprises:
Receiving element 803 is used for receiving and need to carries out the indication that network layer is switched.
Binding unit 804, be used for when receiving the indication that to carry out the network layer switching, utilize acquiring unit 801 new Care-of Address that get access to or that generate to carry out Binding Update, and before carrying out the mobile IP binding, use old Care-of Address to set up the connection of network layer.
Wherein, releasing unit 805 is used for discharging old Care-of Address and context corresponding to described old Care-of Address after 804 renewals of binding unit are finished.
By the embodiment of said method and system as can be known, the embodiment of the invention just receives before network layer that network side sends is switched indication by network side to be that terminal generates new Care-of Address or is provided for generating the information of new Care-of Address for terminal in terminal, and then utilize the new Care-of Address of network side transmission or the new Care-of Address of terminal generation to carry out the network layer switching, compared with prior art, the embodiment of the invention has avoided terminal to dispose new Care-of Address or obtain the time delay that causes be used to the information that generates new Care-of Address when carrying out the network layer switching, thereby can reduce terminal at the handover delay of network layer, and then reduce terminal enters another couple in router from a couple in router whole handover delay.
Further, carrying out just the new Care-of Address that generates being done the DAD detection before network layer is switched because the embodiment of the invention is terminal, thereby avoiding the address conflict detection and the time delay that causes, and then reducing the handover delay of terminal in network layer.
Further, because the terminal of the embodiment of the invention does not need whether have new AR transmission router broadcast message to carry out the network layer Move Detection by detecting, but inform by the switching indication that network side is initiated whether terminal needs to carry out network layer and switch, thereby the time delay of having avoided the network layer Move Detection and having caused, and then reduced the handover delay of terminal in network layer, also avoided terminal to connect the mistake migration problem that a plurality of AR cause simultaneously.
Further, because continuing to use old Care-of Address to keep original IP operation before the MIP Binding Update, the terminal of the embodiment of the invention connects, terminal is after again networking under the new AR like this, just can transceiving data before the MIP Binding Update, thereby avoided the problem of MIP Binding Update time delay, and then reduced the handover delay of terminal in network layer.
Further, because the embodiment of the invention also sent described message to target BS and serving BS before sending the network layer switch indicating information to terminal, carry in the described message and need to carry out the indication that network layer is switched, and new Care-of Address or be used for generating the information of access route of new Care-of Address, be beneficial to like this terminal and when mobile, can also receive and need to carry out the indication that network layer is switched.
At last, because the embodiment of the invention is after finishing the MIP Binding Update, terminal also will send FNA message to network side and inform that the couple in router Binding Update finishes, does corresponding subsequent treatment thereby be convenient to couple in router after Binding Update is finished, such as resource release etc.
More than method, system and the terminal of shortening handover delay that the embodiment of the invention is provided be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand technical scheme of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (15)
1. a method that shortens handover delay is characterized in that, described method comprises:
Network side initiate network layer switch before for terminal generates new Care-of Address, and send to terminal and need to carry out the indication that network layer is switched, and described new Care-of Address or for the information that generates new Care-of Address;
After terminal receives that described needs carry out the indication of network layer switching, utilizing described new Care-of Address to carry out network layer switches, perhaps according to the new Care-of Address of described Information generation be used to generating new Care-of Address, the new Care-of Address that recycles described generation carries out network layer and switches;
Wherein, it is when being caused by fast mobile terminal that network layer is switched, and new Care-of Address that described utilization is received or that generate carries out network layer and switches and comprise:
Terminal is set up to the connection that network side sends message indication network layer;
When terminal receives that described needs carry out the indication of network layer switching, use new Care-of Address to carry out Binding Update, and the connection of before Binding Update is not finished, using old Care-of Address to set up network layer;
It is when being caused by network resource optimization that network layer is switched, and new Care-of Address that described utilization is received or that generate carries out network layer and switches and comprise:
When terminal receives that described needs carry out the indication of network layer switching, use new Care-of Address to carry out Binding Update, and before Binding Update is not finished, use old Care-of Address to set up the connection of network layer.
2. the method for shortening handover delay as claimed in claim 1 is characterized in that, network side is by stateless or condition mode is arranged is that terminal generates new Care-of Address.
3. the method for shortening handover delay as claimed in claim 1 is characterized in that, described network side further comprises before sending the indication that need to carry out the network layer switching to terminal:
Network side is done address conflict to the new Care-of Address that generates and is detected;
When described new Care-of Address has been used in network, be the new Care-of Address of terminal distribution again.
4. the method for shortening handover delay as claimed in claim 1, it is characterized in that, when described information be used to generating new Care-of Address was information of access route, terminal generated new Care-of Address according to information of access route and the self-information that network side sends with stateless.
5. the method for shortening handover delay as claimed in claim 1, it is characterized in that, when described information be used to generating new Care-of Address was information of access route, terminal generated new Care-of Address according to the information of access route and the self information that obtain in advance with stateless.
6. the method for shortening handover delay as claimed in claim 5 is characterized in that, switching when network layer is when being caused by fast mobile terminal, and described terminal is obtained in advance information of access route and comprised:
Terminal is obtained contiguous Base Station Identification by the message that the base station sends, and perhaps obtains the neighbor base station sign by the scanning neighboring base station;
Terminal is retrieved the tabulation of described neighbor base station sign;
The information of access route that is connected with described base station is arranged in described tabulation, and then terminal continues to preserve corresponding information of access route;
The information of access route that in described tabulation, is not connected with described base station, then terminal sends the information of access route request message to network side, and network side is informed terminal with described information of access route.
7. the method for shortening handover delay as claimed in claim 1 is characterized in that, it is when being caused by fast mobile terminal that network layer is switched, and described network side sends to terminal and need to carry out further comprising before the indication that network layer switches:
When terminal sent the Indication message that carries switching refusal or handover cancelling, each entity of network side was released to all resources of terminal distribution;
When terminal sends the Indication message that does not carry switching refusal or handover cancelling, the business datum that network side buffer memory terminal is all.
8. the method for shortening handover delay as claimed in claim 1 is characterized in that, it is when being caused by fast mobile terminal that network layer is switched, and described network side sends to terminal and need to carry out further comprising before the indication that network layer switches:
Send to target BS and serving BS and need to carry out the indication that network layer is switched, and new Care-of Address or be used for generating the information of access route of new Care-of Address.
9. the method for shortening handover delay as claimed in claim 8 is characterized in that, it is when being caused by fast mobile terminal that network layer is switched, and new Care-of Address that described utilization is received or that generate carries out network layer and further comprises after switching:
Terminal discharges the old Care-of Address context relevant with described address, and sends quick neighbours' broadcast indication Binding Update to network side and finish;
Network side discharges relevant data channel and context.
10. the method for shortening handover delay as claimed in claim 9 is characterized in that, it is when being caused by network resource optimization that network layer is switched, and new Care-of Address that described utilization is received or that generate carries out network layer and further comprises after switching:
Terminal discharges the old Care-of Address context relevant with described address, and sends quick neighbours' broadcast indication Binding Update to network side and finish;
Network side discharges relevant data channel and context.
11. a system that shortens handover delay is characterized in that, described system comprises:
Network equipment, be used for initiate network layer switch before for terminal generates new Care-of Address, and send to terminal and need to carry out the indication that network layer is switched, and new Care-of Address or for the information that generates new Care-of Address; With
Terminal, be used for obtaining new Care-of Address from network equipment, perhaps obtain be used to the information that generates new Care-of Address, and according to the new Care-of Address of Information generation that is used for generating new Care-of Address, and when carrying out the indication of network layer switching, the needs of receiving the network equipment transmission utilize described new Care-of Address to carry out the network layer switching;
Wherein, it is when being caused by described fast mobile terminal that network layer is switched, and new Care-of Address that described utilization is obtained or that generate carries out network layer and switches and comprise:
The connection that sends message indication network layer to network side is set up;
When receiving that described needs carry out the indication of network layer switching, use new Care-of Address to carry out Binding Update, and the connection of before Binding Update is not finished, using old Care-of Address to set up network layer;
Wherein, it is when being caused by network resource optimization that network layer is switched, and new Care-of Address that described utilization is received or that generate carries out network layer and switches and comprise:
When receiving that described needs carry out the indication of network layer switching, use new Care-of Address to carry out Binding Update, and before Binding Update is not finished, use old Care-of Address to set up the connection of network layer.
12. the system of shortening handover delay as claimed in claim 11 is characterized in that, network equipment comprises:
The anchor access service network gateway is used to terminal to generate new Care-of Address, and sends described new Care-of Address to the target access service network gateway, perhaps is provided for generating end message and the information of access route of new Care-of Address to the target access service network gateway; With
The target access service network gateway, being used for that the new Care-of Address that the anchor access service network gateway sends is done address conflict detects, the end message and the information of access route that perhaps provide according to the anchor access service network gateway generate new Care-of Address, again collision detection is done in described address, when the address does not clash, described new Care-of Address and described needs are carried out the indication that network layer switches send to terminal, when the address clashes, again be the new Care-of Address of terminal distribution, and will the new new Care-of Address that heavily distributes and described needs carry out the indication that network layer switches and send to terminal.
13. the system of shortening handover delay as claimed in claim 12 is characterized in that, network equipment comprises:
The anchor access service network gateway is used for sending the indication that need to carry out the network layer switching and end message and the information of access route that is used for generating new Care-of Address to the service access service network gateway; With
The service access service network gateway, the end message and the information of access route that are used for providing according to the anchor access service network gateway are that terminal generates new Care-of Address, and described new Care-of Address are done address conflict detect; When the address does not clash, described new Care-of Address and described needs are carried out the indication that network layer switches send to terminal; When the address clashes, be the new Care-of Address of terminal distribution again, and the new Care-of Address that will redistribute and described needs carry out the indication that network layer switches and send to terminal.
14. a terminal is characterized in that, described terminal comprises:
Acquiring unit is used for obtaining new Care-of Address, perhaps obtains be used to the information that generates new Care-of Address and according to the new Care-of Address of described Information generation;
Switch unit is used for when receiving the indication that need to carry out the network layer switching, utilizes described new Care-of Address to carry out network layer and switches;
Wherein, described switch unit comprises:
Receiving element is used for receiving and need to carries out the indication that network layer is switched;
The binding unit is used for utilizing new Care-of Address to carry out Binding Update when receiving the indication that need to carry out the network layer switching, and before carrying out the mobile IP binding, uses old Care-of Address to set up the connection of network layer.
15. terminal as claimed in claim 14 is characterized in that, described terminal further comprises:
Releasing unit is used for discharging old Care-of Address and context corresponding to described old Care-of Address after the renewal of binding unit is finished.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100027061A CN101232698B (en) | 2007-01-23 | 2007-01-23 | Terminal, system and method for reducing switch time delay |
| PCT/CN2008/070010 WO2008089671A1 (en) | 2007-01-23 | 2008-01-03 | Method, system and terminal for reducing handover delay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007100027061A CN101232698B (en) | 2007-01-23 | 2007-01-23 | Terminal, system and method for reducing switch time delay |
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| CN101232698A CN101232698A (en) | 2008-07-30 |
| CN101232698B true CN101232698B (en) | 2013-04-17 |
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| WO (1) | WO2008089671A1 (en) |
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| CN102056236B (en) * | 2009-11-01 | 2014-04-30 | 中兴通讯股份有限公司 | Communication network implemented based on Wimax network structure and terminal access method |
| CN102170674B (en) * | 2010-02-25 | 2015-04-01 | 中兴通讯股份有限公司 | Wimax (worldwide interoperability for microwave access) system capable of realizing non-mooring anchor switching and switching method of system |
| CN106804052B (en) * | 2015-11-26 | 2020-07-31 | 中国移动通信集团公司 | Network layer switching method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1568044A (en) * | 2003-07-01 | 2005-01-19 | 株式会社日立制作所 | Method of seamless home agent switching of mobile IPv6 |
| CN1705285A (en) * | 2004-05-31 | 2005-12-07 | 中国科学院声学研究所 | Tunnel based mobile IPv6 quick switching method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6930988B2 (en) * | 2002-10-28 | 2005-08-16 | Nokia Corporation | Method and system for fast IP connectivity in a mobile network |
| JP4567004B2 (en) * | 2003-11-26 | 2010-10-20 | 韓國電子通信研究院 | Mobile IPv6 fast handover method based on access router |
| CN101119291A (en) * | 2006-07-31 | 2008-02-06 | 华为技术有限公司 | Method and system for processing three-layer switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1568044A (en) * | 2003-07-01 | 2005-01-19 | 株式会社日立制作所 | Method of seamless home agent switching of mobile IPv6 |
| CN1705285A (en) * | 2004-05-31 | 2005-12-07 | 中国科学院声学研究所 | Tunnel based mobile IPv6 quick switching method |
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| WO2008089671A1 (en) | 2008-07-31 |
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