CN101179826A - Service base station updating method of implementing fast base station switch in broadband wireless system - Google Patents
Service base station updating method of implementing fast base station switch in broadband wireless system Download PDFInfo
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Abstract
The invention discloses a service base station renew method for realizing fast base station switching in a wideband wireless system, which includes: an entity of service switching function receives and determines the requirement of service base station renewal and sends the response information to an entity of target switching function directly or through a delay; after determining the received renewal request, the entity of target switching function returns the response information of renewal to the entity of service switching function; after a new service base station is switched in, a mobile station reports a number n of a last forward data packet received to the new service station; the new service station notifies an entity of anchor data channel function to switch an opposite end to the entity of target data channel function from the previous entity of service data channel function and then transmits forward data packets from a number of n plus 1. The invention is capable of effectively realizing support of FBSS, reducing the information handling during service BS renewal of FBSS and reducing the time of switching.
Description
Technical field
The present invention relates to the implementation method that a kind of fast base station switches, relate in particular to a kind of serving BS update method that fast base station switches that in broadband wireless system, realizes.
Background technology
In mobile communication system, switch a critical function that moves as support terminal and enjoy attention.Judging in the performance of handoffs has two important indicators, and Here it is switches required duration and the integrality of switching the back data, just data loss rate.
A kind of FBSS (fast BS switching, fast base station switch) handover mechanism has been proposed with the performance of raising system when switching in the air protocol IEEE802.16e of present BWA: reduce and switch duration, reduce data loss rate.The FBSS switching comprises the active set increase, active set is removed and serving BS (ServingBS) upgrades three phases, is most important among the FBSS and reduce the required time of ServingBS renewal in the three phases with the integrality transmission that guarantees the switching certificate.
In order to support mobile management, WiMAX Forum NWG standard has been introduced the notion of handover (mih) functions and data channel.
(1) the handover (mih) functions role that can serve as according to oneself, the service of being subdivided into handoff functionality, target handoff functionality and relaying handoff functionality.Wherein:
Service handoff functionality (ServingHO): this handoff functionality is used to control all switch decision operations and the signaling process relevant with switching.It is mutual with the target handoff functionality by 0 or more relaying handoff functionality, prepares switching and the result is sent to MS.
Target handoff functionality (TargetHO): this handoff functionality is the handoff functionality that is chosen to be switching target, or potential switching target function.
Relaying handoff functionality (RelayHO): this handoff functionality relaying between service and target handoff functionality switches relevant control messages.
(2) the management data passage is realized by datapath function body DPF in the NWG standard.The DPF functive can be positioned at IAD (AGW), also can be positioned at base station (BS).This functive has four types:
AnchorDP (anchor data channel functional entity): be positioned at AGW, receive the IP bag of network, issue ServingDP, and initiate the foundation of data channel, functions such as release,
ServingDP (service data channel function entity): be positioned at BS, be responsible for setting up data channel with AnchorDP, the packet between the Internet and the MS (travelling carriage),
TargetDP (target data channel function entity): be positioned at BS, new ServingDP after switching is finished,
RelayDP (relay data channel function entity): be positioned at AGW, the signaling of packet between assistance transmission AnchorDP and the ServingDP or data channel management).
IEEE802.16e has stipulated the related procedure of air interface (R1 mouth) at FBSS, and how realizes that at network side FBSS switches related procedure still blank out at present, and the WiMAXNWG standard is not at present also to the support of FBSS.In order to improve system's performance of handoffs, support FBSS, this paper defines this and describes.
Summary of the invention
Technical problem to be solved by this invention is to provide and realizes the serving BS update method that fast base station switches in a kind of broadband wireless system, the realization system is to the support of fast base station handoff functionality, reduce mobile terminal MS and carry out the time that fast base station switches, and the data integrity when guaranteeing to switch.
For solving the problems of the technologies described above, the invention provides and realize the serving BS update method that fast base station switches in a kind of broadband wireless system, comprise the steps:
(11) the service handover (mih) functions receives Mobile Originated serving BS update request, need carry out the serving BS renewal if determine, then with described update request directly or relaying be sent to the target handover (mih) functions, wherein carry the target BS information of wishing to do renewal;
(12) after described target handover (mih) functions is judged the update request that receives, can accept this request if think, then return the response message of agreeing renewal and give described service handover (mih) functions, and return described response message by air interface to travelling carriage by described service handover (mih) functions;
(13) described travelling carriage is at new serving BS, be after former target BS inserts, the numbering n of last the forward data bag that oneself receives to this new serving base stations report, and the opposite end is switched to target data channel function entity from original service data channel function entity by this new serving BS notice anchor data channel functional entity, be new service data channel function entity, and begin to send the forward data bag from numbering n+1.
The present invention can realize the support to FBSS effectively, and reduces the Message Processing in the serving BS broadcasts renewal process of FBSS, reduces and switches duration.
Significant advantage of the present invention is, realized system-level to FBSS support and be not only the mutual of air interface, also propose further in the process that the active set at FBSS adds, the TargetDP and the AnchorDP that just can add active set have set up data channel, in the ServingBS of FBSS renewal process, just need not carry out the process of setting up of data channel like this, reduce the switching duration.Meanwhile, AnchorDP is owing to safeguarded ServingDP and TargetDP information simultaneously, in doing the ServingBS renewal handoff procedure of FBSS, can switch to new data channel immediately, the serving BS broadcasts of so not only accelerating FBSS is new technological process more, has also guaranteed the data integrity when Anchor upgrades simultaneously.
Description of drawings
The AGW that Fig. 1 relates to for the method for the invention and the distribution map of ServingBS and effective set candidate BS functive.
Fig. 2 increases the flow chart that the effective set candidate data channel increases for the FBSS active set that the method for the invention relates to.
The flow chart that the FBSS ServingBS that Fig. 3 relates to for the method for the invention upgrades.
The flow chart that the FBSS active set is removed and the effective set candidate data channel discharges that Fig. 4 relates to for the method for the invention.
Embodiment
The present invention is for the control flow of network side FBSS is provided.Comprise mainly that wherein: ServingHO safeguards the active set of FBSS, comprise that ServingBS upgrades, active set increases, and active set is removed.When core of the present invention was newly to add active set, candidate BS and AnchorDP set up data channel between the two in advance, and AnchorDP comprises increase to the maintenance of effective set candidate data channel, removal, modification etc.
Below, stage by stage active set increase, serving BS renewal, active set are removed these three processes and described.
1, FBSS effective set candidate BS increases, and the effective set candidate data channel to set up process as follows:
Step 1a, the ServingHO that is communicating by letter with this MS receive the handoff request that MS initiates, and ServingHO can also can be at AGW at BS.ServingHO can judging according to the down channel quality of new BS in the switching type of consult supporting with MS before and this handoff request message, discovery can increase candidate BS in the active set that FBSS switches, just this handoff request message is passed through RelayHO, sending to TargetHO (one or more can be arranged) request increases these new BS in the active set of this MS correspondence.
After step 1b, TargetHO had received handoff request message, this request was accepted in decision, and the pre-established message and the AnchorDP that just notify TargetDP to send data channel set up data channel.Can utilize this message between a pair of TargetDP and AnchorDP, to set up one or more of data channel simultaneously here.
After step 1c, TargetDP and AnchorDP had set up data channel, TargetHO just returned switching response message and gives ServingHO, and ServingHO has successfully added new candidate BS in active set, and is eating dishes without rice or wine to return corresponding switching response message to MS.
So far, FBSS effective set candidate BS increases, and the effective set candidate data channel is set up and finished.
It should be noted that and then can directly transmit handoff request/response message, and do not need the relaying of RelayHO if between ServingHO and the TargetHO direct channel is arranged.
2, the ServingBS renewal process of FBSS is as follows:
Step 2a, ServingHO receive the ServingBS update request that MS initiates, and can judge according to the down channel quality of this message and effective set candidate BS, and discovery need be carried out the ServingBS renewal, just handoff request is transmitted to this TargetHO.
Step 2b, TargetHO can accept this request through judging, thinking, just return the switching response message of agreeing renewal and give ServingHO, and ServingHO returns the switching response message that ServingBS upgrades by eating dishes without rice or wine to MS.
Step 2c, MS are after new ServingBS inserts, report the numbering n of last the forward data bag that oneself receives, new ServingBS notifies AnchorDP that the opposite end of data channel is switched to TargetDP (new ServingDP) from original ServingDP after receiving this numbering n, and beginning sends the forward data bag according to the numbering n+1 that receives.Meanwhile original ServingDP can be designated the effective set candidate data channel.So far, the ServingBS of FBSS upgrades and finishes.
In addition can also be with such ServingBS renewal process:
Step 2A, ServingHO receive the ServingBS update request that MS initiates, and can judge according to the down channel quality of this message and effective set candidate BS, and discovery need be carried out the ServingBS renewal, just handoff request is transmitted to this TargetHO.In handoff request, can carry last package number m of current transmission.
Step 2B, TargetHO can accept this request through judging, thinking, just return the switching response message of agreeing renewal and give ServingHO, and ServingHO returns the switching response message that ServingBS upgrades by eating dishes without rice or wine to MS.
Step 2C, meanwhile, TargetDP sets up request message by data channel, please begin to send data to oneself by AnchorDP, and AnchorDP begins on the two passes of ServingDP and TargetDP at the transmission packet.After TargetDP received, buffer memory got off.At least comprise a request indication that whether begins to send data in this notification message, also can comprise package number m and do reference.
Step 2D, MS are after new ServingBS inserts, report the numbering n of last the forward data bag that oneself receives to new ServingDP, new ServingBS notifies AnchorDP that the opposite end of data channel is switched to TargetDP (new ServingDP) from original ServingDP after receiving this numbering n, and beginning sends the forward data bag according to the numbering n+1 that receives.Meanwhile original ServingDP can be designated the effective set candidate data channel.So far, the ServingBS of FBSS upgrades and finishes.
Here need to prove, after the ServingBS renewal finishes, can include original ServingBS in effective set candidate, also can directly remove; Corresponding, original ServingDP can be designated effective set candidate, also can directly remove.
3, FBSS effective set candidate BS removes, and effective set candidate data channel removal process is specific as follows:
Step 3a:MS sends the handoff request message of eating dishes without rice or wine, and comprises effective set candidate BS in the message, wherein can include but not limited to the down channel quality of detected these BS of MS.ServingHO returns switching response message by eating dishes without rice or wine to MS after being judged as the active set removal of FBSS, and notice MS can remove these candidate BS information.
Step 3b: when the switching indication that ServingHO receives the MS feedback, the HO (TargetHO) of the effective set candidate BS that hope is removed with regard to notice discharges corresponding resource.
The release of step 3c:TargetHO notice TargetDP log-on data passage: send data channel to the AnchorDP of correspondence and discharge request, AnchorDP discharges response to TargetDP return data passage after dischargeing the effective set candidate data channel of respective objects.TargetHO responds active set to ServingHO and removes affirmation.Can utilize the data channel release message between TargetDP and AnchorDP, to discharge one or more of data channel simultaneously here.
So far effective set candidate data channel dispose procedure finishes.The FBSS active set is removed subsequent process and is carried out according to the NWG standard.
Also be noted that in addition, service data passage loaded service stream change to some extent as AnchorDP and ServingDP, for example was data channel a1, because when new Business Stream need be created new service data passage a2 between this AnchorDP and ServingDP, AnchorDP also wants to set up corresponding new service data passage b2, c2 etc. with all effective set candidate BS on original basis simultaneously.Same, if the deletion Business Stream is perhaps revised Business Stream, all need to change at the same time the data channel of all corresponding effective set candidate BS.
Below in conjunction with accompanying drawing, the embodiment of the invention is elaborated:
Fig. 1 has provided between AGW and BS in order to support FBSS to switch, and wherein, solid arrow is represented the data channel of ServingBS and AGW, and data are transmitted thereon; Dotted arrow is represented the data channel of active set BS and AGW, and before active set did not become the Anchor base station, data are transmission in the above not.
AnchorDP need safeguard the data channel information of ServingDP and effective set candidate TargetDP, the foundation of the data channel between AnchorDP and the effective set candidate TargetDP is that the active set at FBSS adds (as the left part of Fig. 1) set up in the flow process, the packet that mails to MS is just by sending on the data channel between AnchorDP and the ServingDP, owing to the foundation of other effective set candidate data channel is just built data channel in advance for contingent ServingBS renewal thereafter shifts to an earlier date, it does not really send data in real work, so dot among the figure.After the ServingBS of FBSS renewal is finished, Anchor data function DP need finish the switching (as the right side part of Fig. 1) of data channel, the data channel that former ServingBS becomes behind the effective set candidate BS between itself and AnchorDP just becomes the effective set candidate data channel, AnchorDP no longer transmits data on this data channel, and former effective set candidate BS more changes new ServingBS into behind the new technological process at the ServingBS of FBSS, and the data that the Anchor data function sends to needs MS send by new data channel.
Fig. 2 provides that the FBSS active set adds and the effective set candidate data channel is set up detailed process, specifically comprises following steps:
Step 201:MS sends the handoff request message of eating dishes without rice or wine, and comprises candidate's adjacent area BS information in the message, and described neighbor base station information can include but not limited to the down channel quality of detected these base stations of MS.
It is that the active set of FBSS adds the back (ServingHO herein is positioned at BS that step 202:ServingHO carries out switch decision, also can be positioned at AGW), do not have direct path if having RelayHO between ServingHO and the TargetHO, then ServingHO sends to RelayHO with handoff request message.
Step 203:RelayHO is transferred to TargetHO by the R6 interface with handoff request.
Step 204:TargetHO receives handoff request message, thinks and can accept, and then notifies TargetDP and AnchorDP to set up data channel.
Step 205:AnchorDP returns response message and gives TargetDP.Can utilize this that message is set up one or more of data channel simultaneously here between TargetDP and AnchorDP.
Step 206:TargetDP sets up acknowledgement message to AnchorDP response data passage.
After the pre-established intact data channel of step 207:TargetDP and AnchorDP, do not have direct path if having RelayHO between TargetHO and the ServingHO, then TargetHO sends switching response message to RelayHO.
Step 208:RelayHO transmits switching response message to ServingHO.
Step 209:ServingHO (be positioned at ServingBS here, also can be positioned at AGW) is by eating dishes without rice or wine the switching response message coding and sending to MS.
Step 210:MS confirms current switching by switching indication, and message sends to ServingHO, and can be that cancellation, refusal and agreement are current switches.
Step 211: do not have direct path if having RelayHO between ServingHO and the TargetHO, ServingHO sends switching authentic information to RelayHO.
Step 212:RelayHO is forwarded to TargetHO with switching authentic information.
Step 213:TargetHO returns handoff completion message, does not have direct path if having RelayHO between TargetHO and the ServingHO, and then handoff completion message sends to RelayHO.
Step 214:RelayHO is transmitted to ServingHO with handoff completion message, and so far active set adds flow process and finishes.
It should be noted that and then can directly transmit handoff request/response message, and do not need the relaying of RelayHO if between ServingHO and the TargetHO direct channel is arranged.
The ServingBS that Fig. 3 provides FBSS upgrades detailed process, specifically comprises following steps:
Step 301:MS sends the ServingBS update request, and what utilize is handoff request message herein, can also use CQI (channel quality indication) channel to carry ServingBS update request field and apply for carrying out the renewal of serving BS broadcasts.
After step 302:ServingHO received, the ServingBS that carries out switch decision and be FBSS upgraded, by the R6 interface with transfer of messages to RelayHO, comprise the numbering of last packet of the target BS of wishing to do renewal and current transmission in the message.
What deserves to be explained is that if ServingHO is positioned at AGW then the RelayHO on the serving BS broadcasts need pass through the R6 interface, handoff request is passed to ServingHO on the AGW, judge whether to be ServingBS by it and upgrade.
Also be noted that in addition and then can directly transmit handoff request/response message, and do not need the relaying of RelayHO if between ServingHO and the TargetHO direct channel is arranged.
Step 303:RelayHO is transferred to TargetHO with it.
After step 304:TargetHO has distributed related resource, return switching response message to ServingHO, do not have direct path if having RelayHO between TargetHO and the ServingHO, then switching response message sends to RelayHO.
Step 305: while TargetDP carries type to AnchorDP transmission data channel register request message message to begin also to send data from numbering m+1 to oneself for request AnchorDP.
Step 306:RelayHO is transmitted to ServingHO with switching response message.
After step 307:ServingHO receives, return switching response message to MS by eating dishes without rice or wine.
Step 308:AnchorDP sends forward data to ServingDP and TargetDP simultaneously.After TargetDP receives, these metadata caches are got off, do not send to MS.This step is optional.
Step 309:ServingHO brings MS by SN expansion head with SDU SN numbering.
Step 310:MS confirms current switching by switching indication, and message sends to ServingHO, and can be that cancellation, refusal and agreement are current switches.
Step 311: do not have direct path if having RelayHO between ServingHO and the TargetHO, ServingHO sends switching authentic information to RelayHO.
Step 312:RelayHO is forwarded to TargetHO with switching authentic information.
Step 313:MS finishes handoff procedure, is linked into new ServingBS (former target BS).
Step 314:MS informs the package number that it is received at last to new ServingBS (former target BS).
Step 315:, can directly begin to send data immediately according to this numbering so if before ServingBS upgrades, just be cached with data on the new ServingBS.
Step 316-317: new ServingBS (former target BS) use data channel is set up message informing Anchor data function and is carried out the switching of data channel, data channel is set up message and is comprised the package number that receives at last that MS reports, the package number of receiving at last that AnchorDP reports according to MS sends data on the new ServingDP, and former ServingDP is designated the active set data channel, stop to send data to original ServingDP.
Fig. 4 provides the detailed process that active set is removed and the effective set candidate data channel discharges of FBSS, and specifically comprises following steps:
Step 401:MS sends the handoff request message of eating dishes without rice or wine, and comprises active set BS information in the message.
It is after the active set of FBSS is removed, to return switching response message by eating dishes without rice or wine to MS that step 402:ServingHO (be positioned at ServingBS here, also can be positioned at AGW) carries out switch decision.
Step 403:MS sends the switch indicating information of eating dishes without rice or wine to the affirmation of ServingHO instruct MS to current switching, can be cancellation, refusal and agreement.
Step 404:ServingHO receives that MS then notifies TargetHO to remove the active set base station to the switching authentic of this switching for removing, and comprises in the message and wishes to do the target BS that active set is removed.If between ServingHO and the TargetHO direct channel is arranged, direct pass-along message then, and do not need the relaying of RelayHO, otherwise message sends to RelayHO.
If MS does not send switch indicating information, then ServingHO notifies TargetHO to initiate the data channel dispose procedure behind certain hour voluntarily.
Step 405:RelayHO transmits this handoff request message to TargetHO.
Step 406:TargetHO returns switching response message, if there are not direct-connected path in TargetHO and ServingHO, then message sends to RelayHO.
Step 407:RelayHO is transmitted to ServingHO with switching response message.
Step 408: TargetHO goes registration message request notice AnchorDP to carry out the release of data channel by data channel simultaneously.
Step 409:AnchorDP discharges after the active set data channel of respective objects BS and to go the registration message response to TargetDP return data passage.
Step 410:TargetDP removes to register acknowledgement message to AnchorDP return data passage.
Step 411: after the release of the data channel between TargetDP and the AnchorDP was finished, TargetHO returned handoff completion message to ServingHO, if exist RelayHO message to issue RelayHO.
Step 412:RelayHO is transmitted to ServingHO with handoff completion message, and active set goes to switch and finishes.
Can utilize data channel to go registration message between TargetDP and AnchorDP, to discharge one or more of data channel simultaneously here.
Claims (10)
1. realize the serving BS update method that fast base station switches in a broadband wireless system, comprise the steps:
(11) the service handover (mih) functions receives Mobile Originated serving BS update request, need carry out the serving BS renewal if determine, then with described update request directly or relaying be sent to the target handover (mih) functions, wherein carry the target BS information of wishing to do renewal;
(12) after described target handover (mih) functions is judged the update request that receives, can accept this request if think, then return the response message of agreeing renewal and give described service handover (mih) functions, and return described response message by air interface to travelling carriage by described service handover (mih) functions;
(13) described travelling carriage is at new serving BS, be after former target BS inserts, the numbering n of last the forward data bag that oneself receives to this new serving base stations report, and the opposite end is switched to target data channel function entity from original service data channel function entity by this new serving BS notice anchor data channel functional entity, be new service data channel function entity, and begin to send the forward data bag from numbering n+1.
2. the method for claim 1 is characterized in that, in the described step (11), in the described update request that is sent to the target handover (mih) functions, can carry last package number m of current transmission;
After the described step (12), further comprise step (12A):
Target data channel function entity notice anchor data channel functional entity begins to send the forward data bag to target data channel function entity, at this moment, described anchor data channel functional entity sends the forward data bag to service data channel function entity and target data channel function entity simultaneously, and after described target data channel function entity receives packet, packet is carried out buffer memory;
In the described step (13), if described new serving BS has been cached with data when inserting renewal, then the numbering n that reports according to travelling carriage after inserting renewal and cached data packet begin to send the forward data bag from numbering n+1 immediately.
3. method as claimed in claim 2, it is characterized in that, in the described step (12A), target data channel function entity is set up request message notice anchor data channel functional entity by data channel and is sent data to target data channel function entity, comprises a request indication that whether begins to send data in this message at least.
4. the method for claim 1, it is characterized in that, in the described step (11), described Mobile Originated serving BS update request, be to utilize handoff request message, or use the channel quality indicating channel to carry serving BS update request field and apply for carrying out the renewal of serving BS.
5. the method for claim 1 is characterized in that, in the described step (11), described service handover (mih) functions can be judged with reference to the down channel quality of effective set candidate base station.
6. the method for claim 1 is characterized in that, in the described step (11), if having direct channel between described service handover (mih) functions and the described target handover (mih) functions, then directly transmits described update request; Otherwise, transmit described update request by the relaying handover (mih) functions.
7. the method for claim 1, it is characterized in that, in the described step (11), if the service handover (mih) functions is arranged in IAD, then the relaying handover (mih) functions on the serving BS passes to service handover (mih) functions on the IAD by the R6 interface with described request, and whether does serving BS by it and upgrade.
8. the method for claim 1, it is characterized in that, in the described step (13), further comprise: original service data passage and original serving BS are directly removed, or original service data passage and original serving BS are designated effective set candidate data channel and active set base station.
9. the method for claim 1, it is characterized in that, further comprise: when data channel loaded service stream changed, according to the requirement of the change of described Business Stream, the anchor data channel functional entity changed the data channel of the correspondence of all effective set candidate base stations simultaneously.
10. method as claimed in claim 9 is characterized in that, the situation that described Business Stream changes comprises: require to create new service data passage, deletion Business Stream or revise Business Stream.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013189289A1 (en) * | 2012-06-20 | 2013-12-27 | 华为技术有限公司 | Data processing method, network card and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013189289A1 (en) * | 2012-06-20 | 2013-12-27 | 华为技术有限公司 | Data processing method, network card and system |
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