CN101035356A - Network side service data distribution method in the cross-zone handover of the mobile terminal - Google Patents
Network side service data distribution method in the cross-zone handover of the mobile terminal Download PDFInfo
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- CN101035356A CN101035356A CNA2006100568918A CN200610056891A CN101035356A CN 101035356 A CN101035356 A CN 101035356A CN A2006100568918 A CNA2006100568918 A CN A2006100568918A CN 200610056891 A CN200610056891 A CN 200610056891A CN 101035356 A CN101035356 A CN 101035356A
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Abstract
The invention provides a method for issuing network-side service data in the handover of mobile terminal, comprising: 1) the mobile terminal initiates a handover request through the communication link of the current base station to network side to connect to the target base station; 2) the mobile terminal reports the current service data unit information to the network side; 3) the network side issues the service data not obtained by the mobile terminal through the target base station according to the information. And the invention implements zero packet loss in the service data issuing course when the mobile terminal makes handover.
Description
Technical field
The present invention relates to mobile communication technology, especially micro-wave access to global intercommunication (WiMAX, WorldwideInteroperability Microwave Access) in the system, produce at portable terminal under the situation of handover, system issues the method for data to portable terminal.
Background technology
Along with the extensive use of the flourish and wireless network of internet service, the number of mobile users purpose increases and the increase of user's request provides new demand for wireless systems such as GPRS, 3G, WiMAX and B3G: require these systems can support the multiple business of big data quantity and different service quality requirement.
Wireless access network is as the bridge between wireless user and existing cable network or other business networks, and the business of mainly finishing provides the Packet Service between network and the mobile subscriber to transmit or the function of route.Figure 1 shows that the network architecture system of WiMAX system.In this system, the grouping busihess data message of descending travelling carriage (MS) is from connection service network (CSN, Connectivity Service Network) home agent (HA, Home Agent) with access service network (ASN, Interface R3 between the access service network gateway Access Service Network) (ASN-GW it) is sent among the ASN, is sent on the MS through the R6 interface between ASN-GW and base station (BS) and the R1 interface between BS and the MS data with MSS by ASN-GW.
With reference to Fig. 1, along with moving of user, access device between portable terminal and the access network (BS), and the access device (ASN-GW) between the access network of this terminal and business network (core network) CSN will change, and produced the handover of portable terminal.
Fig. 2 shows one of situation of MS handover.As shown in the figure, mobile the causing of MS will be linked into target BS (Target BS), and situation illustrated in fig. 2 is that the ASN-GW that target BS (Target BS) is connected is not current ASN-GW.At this moment, target ASN-GW or current ASN-GW will make a strategic decision Interface R3 will be moved to target ASN-GW, today system will set up the new air interface R1 of target BS (Target BS) and MS, and the R6 interface link of target BS (Target BS) and target ASN GW; The R1 air interface of deletion current base station (BS) and MS, and the R6 interface of deleting current ASN-GW and current base station; Interface R3 between new destination accessing business network gate (TargetASN-GW) and the HA.
Except that switching flow shown in Figure 2, if target BS in the handoff procedure (Target BS) and serving BS (Serving BS) all are connected under the same ASN-GW, promptly still pass through original ASN-GW at the data passes path of this MS, then switch the migration that only relates to the R6 connection, and do not relate to the migration of Interface R3.
In the prior art, when portable terminal generation handover, the downlink service data that has sent to current ASN-GW will all be dropped, and then rely on the retransmission mechanism on upper strata that downlink service data is sent to portable terminal by target ASN-GW or BS.Yet, described retransmission mechanism is based upon on the end-to-end aspect, the packet that portable terminal need fail and receive to System Reports, promptly retransmission mechanism needs the fellowship of local terminal portable terminal and opposite end portable terminal to realize, and this can cause than higher packet loss and long time delay.And low packet loss ratio and low delay are the important indicators in most Packet Services.
Based on the improvement of said method, when portable terminal generation handover, the packet that current BS reports ASN-GW to issue; Perhaps, current BS does not also send to the data message of BS with data in buffer message and ASN-GW, and promptly the data message that also do not issue of network side passes to target BS.The defective of this method is: what current BS reported only is the data message situation that issues, and the reception condition of the MS that can not know for sure, promptly when wave point R1 transmission produces the wrong data message that causes system to issue and fails successfully to be received by MS, BS can not report system with this situation, thereby existing method still can not be accomplished real zero packet loss when portable terminal generation handover.
Summary of the invention
The technical problem to be solved in the present invention provide a kind of mobile terminal skip zone switch in network side issue the method for data, this method can realize when portable terminal produces handover that the zero packet loss of packet transmits.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions.
The delivery method of network side service data during a kind of mobile terminal skip zone switches comprises: 1) portable terminal is by initiating hand-off request with the communication link of current base station to network side, and request is linked into target BS; 2) portable terminal reports mobile terminal side current business data unit information to network side; 3) network side issues the business datum that portable terminal does not obtain according to described information by described target BS.
In the said method, 2) be specially: portable terminal reports Service Data Unit maximum sequence number in the paid-in continuous data stream to network side; Perhaps, portable terminal reports the initial Service Data Unit sequence number of the business data flow of expecting that network side issues according to the Service Data Unit sequence number of receiving continuously to network side.
On the said method basis, 2) also comprise 12 before): the described service data information of network side request mobile terminal reporting.And, 12) precedingly also can further comprise step: whether network side asks portable terminal to carry out reporting of described data traffic information according to the QoS grade decision of current business flow.
In the said method, the preset information position is used for network side reports request from described service data information to the portable terminal transmission in downlink data packet.Perhaps, network side is by the described service data information of broadcast channel request mobile terminal reporting; Be mobile terminal reporting Service Data Unit serial number assignment uplink air interface physical resource, portable terminal reports the service data information of appointment by described physical resource.
In the said method, carry out before business datum issues at target BS, current base station sends to access service network gateway with the business datum that portable terminal does not receive, and target BS obtains the described business datum of transmitting via access service network gateway; Perhaps, directly obtain the business datum that portable terminal does not receive by inter-base station interface by described current base station.。And current base station sends to target BS according to the initial Service Data Unit that obtains from the portable terminal expectation with this Service Data Unit and follow-up data stream, and target BS issues the business datum of obtaining.
In this method, network side can obtain the service data information of described mobile terminal reporting by current base station; Perhaps network side also can obtain the service data information of described mobile terminal reporting by described target BS.
When portable terminal during to the current base station reporting service data message of network side, when to be network side by current base station obtain described mobile terminal reporting service data information, then portable terminal can perhaps be finished reporting of described service data information at the handover the stage of recognition in the hand-off request stage.When portable terminal during to the current base station reporting service data message of network side, when promptly network side obtained described service data information by target BS, portable terminal can report described service data information in the communication link process of setting up with target BS; Perhaps carry out reporting of service data information at the data transfer phase of finishing after communication link is set up.
Current base station described in this method may be connected with same access service network gateway with target BS; Realize then in this method process that the signaling between target BS and current base station is transmitted by an inter-base station interface or a specific access service network gateway.Perhaps, current base station described in this method is connected respectively to different access service network gateways with target BS; Then the signaling between target BS and current base station realizes transmitting by the Interface R4 between inter-base station interface or described access service network gateway.
Above technical scheme as can be seen, the present invention eats dishes without rice or wine according to IEEE 802.16 protocol definitions, MS reports service data information (the Service Data Unit sequence number of the business data flow that has obtained as MS of current corresponding business data flow, perhaps MS expects the Service Data Unit sequence number that network side issues), the reference that utilizes described service data information to begin to transmit data as respective cache data cell in the data lossless migration in the mobile terminal skip zone handoff procedure, make network side can be conscientiously according to the reception situation issuing service data of mobile terminal side business data packet, thereby when portable terminal generation handover, real realization business datum issue zero packet loss in the process.
And, also can whether trigger provided by the present invention among the present invention according to the QoS grade decision of current business at the harmless delivery method of mobile terminal skip zone switching certificate, and then make that application of the present invention is more flexible, be adapted to the needs of different QoS grade more, for the transfer of data of the higher business of qos requirement provides assurance.
And, existed system structure and mobile terminal skip zone switching flow have been made full use of among the present invention, portable terminal all can be realized about reporting in a plurality of stages of handover of described service data information, thereby the present invention is compatible with existing technology more, realize convenient and simplely, technical application is stronger.
Further, among the present invention the described service data information of portable terminal report form, and the mode of the described information of network side request mobile terminal reporting is various, makes that the information interaction of portable terminal and network side is more flexible; And because the present invention has made full use of existing WiMAX network interface, thereby under the multiple network structure, the present invention all can realize information interaction efficiently, thereby makes that realization time-delay of the present invention is shorter, and technical application is stronger.
Description of drawings
Fig. 1 is for being the network architecture system figure of WiMAX system;
Fig. 2 is a portable terminal handover schematic diagram under the WiMAX system;
Fig. 3 is an embodiment of the invention flow chart.
Embodiment
The present invention is applicable to the WiMAX system.The network architecture system of WiMAX system as shown in Figure 1 mainly comprises ASN, CSN and MSS three parts in the WiMAX system.
Wherein ASN is defined as: gather for the WiMAX terminal provides the network function of wireless access service, ASN has comprised BS and ASN-GW network element.Wherein, the function of BS comprises: provide the L2 of BS and MSS to be connected, RRM is measured and power control, the compression of the data of eating dishes without rice or wine and encryption.The function of ASN-GW comprises: for MSS authentication function provides proxy function, support the network of NSP to find and select, for MSS provides the Relay function (as IP address assignment) of L3 information, RRM; Except that above-mentioned functions, the function of ASN-GW can also comprise energy): switch SS paging and location management in the ASN; Tunnel management between the ASN-CSN, i.e. external agent in the mobile IP technology (FA), vision location registration.
Described CSN is defined as: for the WiMAX terminal provides IP Connection Service.The CSN major function comprises: the IP address assignment of MSS, Internet inserts, AAA proxy or server, based on user's authorization control, ASN is to the tunnel of CSN, i.e. home agent in the mobile IP technology (HA), WiMAX user's charging and the clearing between the operator, tunnel management under the roaming condition between the CSN, the switching between the ASN, various WiMAX services (as location-based business, multi-medium multi-packet broadcasting and broadcasting service, IP Multimedia System business).
Described MSS is a mobile subscriber equipment, i.e. portable terminal, and the user uses this devices accessing WiMAX network.
Based on the system framework of WiMAX, the present invention proposes a kind ofly to support data lossless to switch according to the grade of service and quality of service requirement in wireless access network, thereby reaches the purpose of low packet loss ratio and low delay.Concrete, key of the present invention is that how network side does not also receive portable terminal accurately that newly-built communication link issues after business datum is by handover, reaches the purpose that reduces packet loss.Further, for addressing the above problem, the relevant information of eating dishes without rice or wine to report current MS side business data flow of MS IEEE 802.16 protocol definitions among the present invention, specifically carry these information and make network side know that accurately the packet of related service stream sends situation, and then to cross and define correlated process and realize that the real zero packet loss of business datum issues in the mobile terminal skip zone handoff procedure by increasing in the related news in the network side handoff procedure.
Based on above-mentioned analysis, core concept of the present invention is: portable terminal is by initiating hand-off request with the communication link of current base station, and request is linked into target BS; Portable terminal reports mobile terminal side current business data unit information to network side; Network side issues the business datum that portable terminal does not obtain according to described information by described target BS.
Based on above-mentioned core concept, the present invention relates generally to the content of following four aspects.
1) whether the difference decision at service flow QoS triggers employing data distributing method of the present invention in the handoff procedure, promptly carries out the data lossless migration.For example, for the insensitive real-time voice business of packet loss, when portable terminal carries out handover, can not trigger and adopt network side data delivery method of the present invention; And for FTP etc. for the highstrung data service of packet loss, then need to start data distributing method of the present invention.Described decision rule according to QoS, those skilled in the art can be provided with according to concrete business, and this paper repeats no more.
2) when data distributing method of the present invention is adopted in judgement, promptly carry out the business data flow of lossless migration for needs, network side obtains MS accordingly to the actual reception situation of these service flow packets by eating dishes without rice or wine, promptly be moved the correct Service Data Unit sequence number SDU SN information that receives of terminal in the service flow of needs execution lossless migration; It both can be the Service Data Unit maximum sequence number in the paid-in continuous data stream of portable terminal, perhaps, also can be the initial Service Data Unit sequence number that portable terminal is expected the business data flow that network side issues.For example, the Service Data Unit sequence number that has obtained when mobile terminal request is carried out handover is: 1,2,3,4,5,7, then described Service Data Unit maximum sequence number is 5, and the initial Service Data Unit sequence number of the business data flow that described expectation network side issues is 6.
The relevant information of described mobile terminal reporting can be obtained in current service BS side, also can obtain in the target BS side, and particular content sees hereinafter the explanation to the preferable implementing procedure of the present invention for details.
3) in handoff procedure, the needs of mobile terminal reporting are carried out the context transfer that related service data unit sequence information in the business data flow of lossless migration can be used as portable terminal and network side in the handover procedure.Wherein, transmission has multiple situation opportunity, as: handoff preparation phase, switch the stage of recognition, network is reentried the stage, the Data Path stage.Detailed ginseng is hereinafter to the explanation of the preferable implementing procedure of the present invention.
4) for the mode of obtaining Service Data Unit (SDU) sequence number that MS receives by wave point.Existing agreement regulation: BS requires MS to report relevant information by the mode of active request, therefore, when the present invention adopts 3) described in mode with the Service Data Unit sequence number information as handover procedure in the context of portable terminal and network side when transmitting, adoptable way is to preset request son head to be used for network side and to report request to portable terminal transmission information in downlink data packet, and, distribute one section physical resource so that MS reports described SDU SN information.
In addition to the above methods, also by increasing the mode (as SN_Report_IE) of a UL_MAP_IE, network side is realized portable terminal is carried out the request of information reporting by broadcasting this message, and carries out reporting of described information by the network parameter indicating mobile terminal that carries in this message.Up UL_MAP message is to be used for the interface-free resources distribution condition of broadcast upstream subframe, if sub-frame of uplink is divided into 3 burst interval (burst), will comprise 3 UL_MAP_IE so in the UL_MAP message, the shared physical resource (as resource informations such as time slot and number of subchannels) of these 3 burst is described respectively, and the employed code modulation mode of this burst data carried by data, and inform that this burst distributes to the transmission who is used for data.Portable terminal can know that by receiving UL_MAP message whether present frame is to oneself having arranged resource to be used to send data, if have, then the while also can be known the Radio Resource (time slot and shared subchannel) that the data of this terminal will be carried, and sends the code modulation mode that those data adopt.Can also carry the UL_MAP_IE of other kind simultaneously in the UL_MAP message, such as in order to the statement specific function, the present invention obtains the SN information that the MS respective service flows the packet that is received in order to support the base station, (UL_MAP_IE has a variety of to have increased new UL_MAP_IE, UL_MAP_IE is the general designation of the various different I E in the UL_MAP message) for SN_Report_IE, carry network among this SN_Report_IE and allow the SN information of packet of the corresponding with service stream that reports.SN_Report_IE can appear in the UL_MAP message with certain cycle, but by increasing the mode of new DL_MAP_IE-SN_Report_IE, just can allow the SN of packet of the corresponding business data flow that reports when network side needs, report, because each or every kind of DL_MAP_IE have specific functional meaning, when being necessary to occur, it just can occur.
Following with reference to Fig. 3, specify preferable implementing procedure of the present invention.
As shown in the figure, among step 1a, 1b, the 1c, the user is owing to the switching flow that triggered such as mobile of certain reason such as position.
After BS receives this message, judge the business data flow that this MSS is current, and, do not need to carry out the data flow of lossless migration according to the business data flow that the desired QoS grade distinguishing of business data flow need adopt the present invention to carry out the data lossless migration; In the present embodiment preferably with QoS as whether adopting the present invention to carry out the basis for estimation that data lossless moves, yet the present invention does not limit described basis for estimation, and those skilled in the art still can judge whether carry out the data lossless migration according to other characteristics or the requirement of data service.
Do the business data flow of lossless migration for needs, BS comprises indication in downlink data packet (Down LinkData Package among the figure), require MSS in the upstream data bag, comprise the sequence number SN of the SDU that correctly receives continuously.Concrete indicating mode can be to realize by the special son mode of definition in current idle message mentioned above; Perhaps, by the SN information of passing through the business data flow that special UL_MAP_IE informs that portable terminal need report mentioned above, and arrange resource and allow portable terminal carry out reporting of relevant information by this resource.
Network side can receive upstream data bag (Up Link Data Package among the figure) in the different phase in the mobile terminal skip zone handoff procedure, comprises the related service data unit information that MSS reports in the described packet; Reflect the maximum S of the descending SDU that correctly receives of portable terminal in this information, perhaps the SN of the desired network side of the portable terminal SDU that continues to issue.A shown in Figure 3, B, four positions of C, D, wherein position A shows that portable terminal can carry described SDUSN information to current base station by the upstream data bag in the hand-off request stage; Position B shows that portable terminal can carry described SDU SN information to current base station by the upstream data bag at the handover the stage of recognition; Position C shows that portable terminal can utilize the upstream data bag that described SDU SN information is reported current base station in the network reentry stage; Position D shows after MSS switches to target BS, by the upstream data bag described SDU SN is reported target BS.
2f: current service BS issues MOB_MSHO_RSP message to MSS, and instruct MS S switches.And stop the transmission of downlink data simultaneously, but BS does not stop the reception of upstream data bag, therefore can upgrade corresponding SN value according to the SDU SN relevant information of MSS side entrained in the upstream data bag yet.
2g:MSS replys handover success indication MOB_HO_Indication message.
2h: current service BS replys to switch to current ASN GW and confirms HO-Comfirm message, at this moment, must carry the relevant information that MSS reports described SDU SN in current BS sends to the message of current ASN GW.
Finish 2i after the flow process of 2l, current service ASN GW can require described current BS that the packet packing that successfully is not transferred to portable terminal is uploaded, as shown in FIG. DATATRANSFER according to the SN information of receiving.If ASN GW does not support buffer memory, this step also can be carried out after the 3a of follow-up flow process step, promptly serves ASN GW and asks former BS that packet is uploaded, and directly be transmitted to target BS continuation transmission.
Step 3a: target BS and ASN GW set up data channel Data Path.
Setting up in the process of Data Path, if MSS reports the relevant information of described SDU SN to give target BS in the D process, then target BS will be set up process by Data Path described SN information will be reported described current service ASN GW;
After finishing Data Path and setting up, the data that are not sent completely in described current base station (serving BS be handover before) will directly be transmitted or buffer memory be forwarded to target BS and issue to portable terminal with continuation by current service ASN GW.So far the lossless migration process is finished.
In the above-described embodiments, the handover of portable terminal does not relate to the switching current base station of Interface R3.And in the foregoing description, the forwarding of the ASN-GW that message is connected to jointly by current base station and target BS.If between base station (BS) interface is arranged, then those message are undertaken by the interface between base station (BS).
When the handover of portable terminal related to the variation of ASN-GW, promptly current base station was connected in different ASN-GW with target BS.If between base station (BS) interface is arranged, then those message are undertaken by the interface between base station (BS); On the other hand, Interface R4 between ASN-GW can be used for carrying out the transmission of message between ASN-GW, thereby if the message transmission between the base station (BS) is to be undertaken by a plurality of ASN-GW in the existing network, then message also can be transmitted by ASN-GW in the foregoing description.
In the foregoing description, realize that by in downlink data packet, presetting request head network side reports request to portable terminal transmission information.As mentioned 4) described in, the present invention also can report request to base station transmission information by the network side broadcast.
Further, the present invention also can support the mode of soft handover, and described soft handoff is that portable terminal is at first set up the communication link with target BS, remove again and original base station between communication link.
Adopt network side to judge and the trigger data lossless migration among the above embodiment, the relevant SDU SN information of request mobile terminal reporting, yet the present invention does not get rid of portable terminal initiatively reports relevant SDU SN information, and triggers the specific implementation of described data lossless migration.
More than a kind of mobile terminal skip zone provided by the present invention switched in the delivery method of network side service data 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 method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1, the delivery method of network side service data during a kind of mobile terminal skip zone switches is characterized in that:
1) portable terminal is by initiating hand-off request with the communication link of current base station to network side, and request is linked into target BS;
2) portable terminal reports mobile terminal side current business data message to network side;
3) network side issues the business datum that portable terminal does not obtain according to described information by described target BS.
2, the delivery method of network side service data is characterized in that 2 during mobile terminal skip zone as claimed in claim 1 switched) be specially:
Portable terminal reports Service Data Unit maximum sequence number in the paid-in continuous data stream to network side; Perhaps, portable terminal reports the initial Service Data Unit sequence number of the business data flow of expecting that network side issues according to the sequence number of the Service Data Unit of receiving continuously to network side.
3, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 1 or 2 switches is characterized in that:
2) also comprise 12 before): the described service data information of network side request mobile terminal reporting.
4, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 3 switches is characterized in that:
12) take a step forward and comprise: whether network side asks portable terminal to carry out reporting of described data traffic information according to the QoS grade decision of current business flow.
5, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 3 switches is characterized in that:
The preset information position is used for network side reports request from described service data information to the portable terminal transmission in downlink data packet.
6, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 3 switches is characterized in that:
Network side is by the described service data information of broadcast channel request mobile terminal reporting;
Be mobile terminal reporting Service Data Unit serial number assignment uplink air interface physical resource, portable terminal reports the service data information of appointment by described physical resource.
7, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 3 switches is characterized in that:
3) current base station sends to access service network gateway with the business datum that portable terminal does not receive in, and target BS obtains the described business datum of transmitting via access service network gateway; Perhaps, target BS directly obtains the business datum that portable terminal does not receive by described current base station by inter-base station interface.
8, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 1 switches is characterized in that:
Portable terminal is to the current base station reporting service data message of network side.
9, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 8 switches is characterized in that:
Portable terminal is perhaps finished reporting of described service data information at the handover the stage of recognition in the hand-off request stage.
10, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 1 switches is characterized in that:
Portable terminal is to the target BS reporting service data message of network side.
11, the delivery method of network side service data during mobile terminal skip zone as claimed in claim 10 switches is characterized in that:
Portable terminal reports described service data information in the communication link process of foundation and target BS; Perhaps carry out reporting of service data information at the data transfer phase of finishing after communication link is set up.
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| CN101785235A (en) * | 2007-08-13 | 2010-07-21 | 高通股份有限公司 | Optimizing in-order delivery of data packets during wireless communication handover |
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| CN101820656B (en) * | 2009-02-27 | 2012-10-03 | 华为技术有限公司 | Service flow switching method, network selection method, and related device and system |
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| US10743225B2 (en) | 2016-06-24 | 2020-08-11 | Huawei Technologies Co., Ltd. | Scheduling method and base station |
| US11109289B2 (en) | 2016-06-24 | 2021-08-31 | Huawei Technologies Co., Ltd. | Scheduling method and base station |
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