CN100461666C - Method for preventing data loss while switching between base stations of user's device - Google Patents
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- CN100461666C CN100461666C CNB2006100348208A CN200610034820A CN100461666C CN 100461666 C CN100461666 C CN 100461666C CN B2006100348208 A CNB2006100348208 A CN B2006100348208A CN 200610034820 A CN200610034820 A CN 200610034820A CN 100461666 C CN100461666 C CN 100461666C
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Abstract
This invention provides a method for preventing data lost of UE switched among base stations including: starting the Ea event and canceling the Eb event buffer-stored in AGW, when the E-Node B finds out that the trigger condition of the Ea is met, it intiates the signaling of sending data buffer-storage to AGW and changes the state actively to send information to the AGW, which begins to buffer-store the data and processes the ACK information , when the E-Node B finds out the trigger condition of the Eb is met, it initiates the signaling of stopping data buffer-storage to AGW and changes the state actively to stop sending ACK information to AGW, which stops buffer-storing data and does not process ACK information anymore.
Description
[technical field]
The present invention relates to the evolvement network of a kind of universal mobile telecommunications system (UNTS), relate in particular to the method that prevents subscriber equipment data loss while switching between different base station in a kind of wireless evolution network.
[background technology]
UMTS is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface technologies.The network architecture of UMTS as shown in Figure 1, it is made up of subscriber equipment (UE), wireless access network (UTRAN) and core net (CN).Wherein UTRAN handles all and wireless function associated, and CN handles that all voice calls are connected with data in the UMTS system, and the exchange and the routing function of realization and external network (External Network).
See also shown in Figure 2ly again, UTRAN comprises one or several RNS (RNS).Each RNS is made up of a radio network controller (RNC) and one or more base station (Node B).RNC is responsible for determining the switching of UE, and it has merging/separation function, to be supported in the grand diversity between the different Node B.Node B is by the Iub interface and the RNC interconnection of standard, mainly finish the processing of Uu interface physical layer protocol, its major function is spread spectrum, modulation, chnnel coding and despreading, demodulation, channel-decoding, the functions such as mutual conversion that also comprise baseband signal and radiofrequency signal are supported fdd mode, tdd mode or bimodulus.Interface between RNC and the CN is the Iu interface.In UTRAN inside, by Iur interactive interfacing information, Iur can connect or connect by transmission network by the direct physical between the RNC between the RNC.The network architecture that Fig. 2 disclosed is based on the 3GPP Re16 framework of version in the past.
For a kind of low time delay, high data rate, high power system capacity and covering, low cost, complete IP-based network are provided, 3GPP is studying a kind of brand-new evolution network framework to satisfy following mobile network's application demand, and evolvement network comprises the Long Term Evolution (LTE) of System Architecture Evolution (SAE) and Access Network.Wherein the Access Network of evolution is called E-UTRAN.
Framework for the radio gradual network system in future exists multiple candidate scheme at present, and wherein popular is the two-layer node framework, as shown in Figure 3.In this framework, E-Node B is the Node B after the evolution, the function of most RNC before having.IAD (Access GW) has the most of function or the function combinations of former core net node (as supporting node (SGSN) or gateway supporting node (GGSN)).Wherein, outside automatic repeat request (Outer ARQ) function mainly is placed on E-Node B place.
In the framework of wireless evolution network, if Outer ARQ carries out at E-Node B, core net node AGW does not carry out metadata cache, in handoff procedure, promptly switch to target E-Node B so, then can cause losing of data if also have data not send the UE that finishes among the E-Node B of source.The scheme that addresses this problem at present has two classes: the one, in handoff procedure, transmit the data that among the E-Node B of source, do not obtain the ACK affirmation to target E-Node B from source E-NodeB, send to UE after the switching by target E-Node B again, to guarantee the integrality of data down transmission; The 2nd, in handoff procedure, send data to source E-Node B and two simultaneously the broadcasting of target E-Node B, to guarantee that handoff procedure can not cause losing of down-transmitting data from AGW.A kind of switching distance as shown in Figure 4, it comprises the steps:
1, UE reporting measurement reports;
2, E-Node B in source switches according to the measurement report decision that UE reports;
3, E-Node B in source sends data forwarding message to target E-Node B;
4, target E-Node B carries out resource allocation;
5, after resource allocation was finished, target E-Node B sent the response message of data forwarding to source E-Node B;
6, E-Node B in source forwards to target E-Node B with the downlink data packet that the packet of not receiving the UE confirmation of receipt as yet of this locality storage and the AGW that constantly receives send;
7, E-Node B in source sends radio bearer affirmation (RB Reconfiguration) message to UE;
8, UE is synchronized to target E-Node B;
9, finish synchronously after, UE sends the radio bearer acknowledge message to target E-Node B and finishes (RBReconfiguration Complete) message;
10, target E-Node B asks toggle path to AGW transmit path handoff request (Path Switch Request) message;
11, the AGW toggle path arrives target E-Node B, and sends Release message, release way to source E-Node B.
In the above-mentioned handoff procedure, need between source E-Node B and target E-Node B, set up data channel, the line data of going forward side by side is transmitted, and this repeating process is an extra process for switching flow, and needs to have between source E-Node B and the target E-Node B interface of data surface.
The losing of data in the handoff procedure, it is data cached at core net node AGW place also having a kind of scheme of considering at present, after data validation was sent to UE, E-Node B reinformed the corresponding data in the AGW deletion buffer memory.But this idea needs carry out metadata cache at AGW place and E-Node B place all the time, and resource is caused repetition and waste, and it is synchronous to need constantly to carry out between AGW and the E-Node B data mode.
[summary of the invention]
The objective of the invention is at above-mentioned the deficiencies in the prior art, a kind of subscriber equipment method of loss of data in the handoff procedure between different base station that prevents that designs at wireless evolution network is provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method that prevents subscriber equipment data loss while switching between the base station, this method comprises the steps:
A. subscriber equipment sends measurement report to Current Serving BTS, Current Serving BTS is analyzed measurement report, the desired value that draws according to measurement report when finding to satisfy first trigger condition surpasses one first predetermined threshold and continues a special time, then trigger first incident, promptly set up the upper strata buffer memory to the IAD request;
B. IAD is set up the downlink data buffer memory of respective user equipment; And
C. subscriber equipment sends measurement report to Current Serving BTS once more, and serving BS is analyzed measurement report:
When finding to satisfy the handover decisions condition, carry out from the handoff procedure of Current Serving BTS to target BS, after being finished target BS defaulted to second state;
When find satisfying second trigger condition, when promptly the desired value that draws according to measurement report is less than one second predetermined threshold, then trigger second incident, switch state to the second state of Current Serving BTS, and remove the upper strata buffer memory to the IAD request.
When the present invention will switch at subscriber equipment,, set up the downlink data buffer memory of respective user equipment in advance at IAD, can avoid losing of data in the handoff procedure by base station notice IAD; And when subscriber equipment breaks away from the state that will switch, again the buffer memory of IAD is removed, carry out normal transfer of data, thereby reduce resource occupation.Compared with prior art, the present invention does not carry out two the broadcasting of data of a data forwarding between source E-NodeB and the target E-Node B or IAD to two an E-Node B, saved Internet resources, also reduced the memory space demand of core net node simultaneously data.
[description of drawings]
With reference to a plurality of accompanying drawings, introduce the present invention in detail by means of the non-limitative example of the embodiment of the invention:
Fig. 1 is the composition structure chart of existing universal mobile telecommunications system (UMTS);
Fig. 2 is the composition structure chart of wireless access network (UTRAN) part in the existing UMTS system;
Fig. 3 is the configuration diagram of existing evolvement network at the UMTS system;
Fig. 4 is the switching flow figure at a kind of prior art of evolvement network shown in Figure 3;
Fig. 5 is the subscriber equipment of the present invention flow chart that the upper strata buffer memory changes before and after switching;
Fig. 6 is according to handover decisions of the present invention, Ea incident and Eb incident are triggered in handoff procedure condition and sequential schematic.
[embodiment]
The intent of the present invention is to provide the method that prevents subscriber equipment data loss while switching between the base station in a kind of wireless evolution network, to solve the drawback that exists in the prior art.Involved entity comprises that mainly source E-Node B, the UE of subscriber equipment (UE), the current connection of UE wish the target E-Node B that switches in the handoff procedure, and the IAD (AGW) that connects Access Network and core net.When this method will switch at UE,, set up the downlink data buffer memory of corresponding UE in advance at the AGW place, to avoid losing of data in the handoff procedure by E-Node B notice AGW; And when UE breaks away from the state that will switch, again the buffer memory at AGW place is removed, carried out normal transfer of data, thereby reduce resource occupation.In order further to reduce the consumption of AGW place buffer memory, when carrying out buffer memory, can also delete the data that received in the AGW buffer memory by the real-time ACK message that reports of E-Node B by the UE affirmation at the AGW place.The concrete in one embodiment implementation method of the present invention is please in conjunction with shown in Figure 5, and is as described below:
Under step 1, the normal condition, UE is by the downlink data packet of current service E-Node B (being source E-Node B) reception from AGW.Keeping with when source E-Node B is connected, UE measures signal strength signal intensity and the quality of other E-Node B, and measurement report is sent to source E-Node B.Source E-Node B analyzes measurement report, under the situation that satisfies the certain trigger condition, think that this UE may will switch, therefore triggering first incident (promptly starts the incident of AGW buffer memory, represent with Ea), and the current state of handed over service E-Node B is the first state Ea (described below).
Step 2, source E-Node B send signaling to AGW, and the upper layer data service buffer of corresponding UE is set up in request.In a specific embodiment, E-Node B in source can begin when sending signaling to the reply ACK information of AGW transmission at upper layer data.The process of transmitting of this ACK information is: source E-Node B receives the descending upper layer data bag (PDCP packet) that AGW sends, it is carried out the segment processing of Outer ARQ layer, and a several A RQ piece (RLC packet) that generates mails to UE by air interface, after the ACK information of receiving all ARQ pieces that belong to this packet from UE, source E-Node B is to the ACK information of AGW transmission corresponding to this upper strata PDCP packet; Certainly, also can omit source E-Node B in this step,, reserve more buffer memory capacity but require AGW to go up like this to reduce the transmission load between E-Node B and the AGW to the step that AGW sends ACK information.
Step 3, AGW did not process the ACK message of receiving before receiving signaling, after receiving that the signaling of upper layer data service buffer is set up in request that source E-Node B sends, start the upper strata buffer memory, beginning buffer memory downlink data, and begin to handle the ACK message of sending from this source E-Node B at upper layer data.Processing procedure for ACK message is: AGW sets up the buffer memory of specifying size according to relevant parameter subsidiary in the signaling of receiving to the downlink data of particular UE, the packet that sends to source E-Node B from AGW is all put into this buffer memory after transmission afterwards, and is full up to buffer memory; AGW receive source E-Node B beam back build upright upper strata buffer memory really ACK message (though this ACK message is that IAD is issued in the base station, but be replying of after the data of sending from AGW are received by UE, just sending) after, with corresponding packet deletion in the buffer queue, to send and do not receive that the packet of ACK message deposits in buffer memory according to certain queue discipline, when buffer memory is full, optionally abandon.
After execution of step 3, two kinds of situations may appear.
First kind of situation: UE will switch really.The implementation of this kind situation is referring to shown in the A part among Fig. 5.UE sends to measurement report source E-Node B once more, and source E-Node B analyzes measurement report, is satisfying under specific first trigger condition, and decision is switched.UE, source E-Node B, target E-Node B and AGW fellowship handoff procedure.Because data have been carried out buffer memory at AGW in step 3, therefore in handoff procedure, do not need two (bicasting) or the data forward pass (dataforwarding) broadcast of data, after switching is finished, target E-Node B becomes new service E-Node B, it defaults to the second state Eb, the default normal transmission state that is in of AGW does not promptly have the upper layer data service buffer, and has become between the target E-Node B of service E-Node B and do not have the mutual of ACK message.
Another kind of situation: UE reality does not switch.The implementation of this kind situation is referring to shown in the B part among Fig. 5.UE sends to measurement report the E-Node B (source E-Node B) of current service once more, service E-Node B analyzes measurement report, satisfying under specific second trigger condition, think that this UE can not switch, therefore triggering second incident (promptly cancels the incident of AGW buffer memory, represent with Eb), and the state of switching current service E-Node B is the second state Eb (described below).Then, service E-Node B stops to the ACK information of AGW transmission at upper layer data simultaneously to the upper layer data service buffer that AGW sends the corresponding UE that sets up in the signaling request cancellation step 3.AGW with the corresponding cache cancellation, recovers normal downlink data and sends after receiving the signaling of upper layer data service buffer of the corresponding UE of the service E-NodeB request of the sending cancellation.
Need to prove that in said process, when being encrypted in AGW and carrying out of PDCP bag, AGW is at the plain code that needs to comprise sequence number in the process of E-Node B transmission PDCP bag.
The present invention is closely related to the method to set up of Ea and Eb trigger conditions and the mode of handover decisions.The Ea incident is will carry out being triggered before the handover decisions at E-Node B, its objective is that upper layer data has backup at AGW when guaranteeing to switch generation, thereby avoids the loss of data in the handoff procedure; The Eb incident is to trigger under the situation that E-Node B discovery UE can not switch in a short time when AGW has the state of upper layer data buffer memory, its objective is and guarantee that AGW only carries out the buffer memory of upper layer data when being necessary, thereby avoid AGW to go up a large amount of wastes of cache resources.
Handover decisions is mainly made according to measurement report, and E-Node B carries out certain post-processing to measurement report, draws a desired value V, and this desired value can be UE in the received signal intensity of neighbor cell with at the ratio of the received signal intensity of this sub-district.When this desired value V surpasses a certain thresholding TH_ho, and keep T_ho during the time, trigger handoff procedure this UE.
The Ea incident adopts the desired value V identical with handover decisions, when this desired value V surpasses a certain thresholding TH_Ea, and keeps T_Ea during the time, triggering Ea incident; The Eb incident also adopts the desired value V identical with handover decisions, promptly triggers the Eb incident below a certain thresholding TH_Eb when this desired value V drops to.The triggering of Eb incident does not need one period retention time, is in order to reduce the chance of doing the upper layer data buffer memory at AGW as far as possible.
Following constraints is followed in the setting of above-mentioned each parameter:
1).TH_Ea<＝TH_ho
2).T_Ea<T_ho
3).TH_Ea>TH_Eb
Wherein, condition 1) and 2) guarantee that condition 3 took place the Ea incident before switching) guarantee the frequent generation that Ea incident and Eb incident can not vibrated.
See also Fig. 6, it is according to handover decisions of the present invention, Ea incident, Eb incident are triggered in handoff procedure condition and sequential schematic.After the Ea incident is triggered, if above-mentioned first kind of situation takes place, promptly have to switch and take place, then switch back target E-Node B and enter default Eb state; After the Ea incident is triggered, if above-mentioned second kind of situation takes place, promptly do not switch and take place, then E-Node B in source directly enters the Eb state.Have only when E-Node B is under the Ea state and just may trigger the Eb incident, have only when E-NodeB is under the Eb state and just may trigger the Ea incident.
To sum up, the present invention not be used in and carries out data forwarding between the E-Node B or carry out two the broadcasting of data from AGW to two E-Node B and avoid losing of data, thereby do not need to set up the data forwarding passage between source E-Node B and the target E-Node B, avoided two problems of bringing such as the wasting of resources of broadcasting yet.In addition, the present invention in the data loss problem, has also reduced the memory space demand of core net node to data owing to adopted a kind of event trigger mechanism to adjust the buffer status at AGW place dynamically as much as possible in having avoided handoff procedure.The variation of the equalization that one of ordinary skill in the art is done according to the present invention is within the claim that all should still belong to patent of the present invention contains.
Claims (8)
1. a method that prevents subscriber equipment data loss while switching between the base station is characterized in that, this method comprises the steps:
A. subscriber equipment sends measurement report to Current Serving BTS, Current Serving BTS is analyzed measurement report, when finding to satisfy first trigger condition, promptly the desired value that draws according to measurement report surpasses one first predetermined threshold and continues a special time, then trigger first incident, promptly set up the upper strata buffer memory to the IAD request;
B. IAD is set up the downlink data buffer memory of respective user equipment; And
C. subscriber equipment sends measurement report to Current Serving BTS once more, and serving BS is analyzed measurement report:
When finding to satisfy the handover decisions condition, carry out from the handoff procedure of Current Serving BTS to target BS, after being finished target BS defaulted to second state;
When find satisfying second trigger condition, when promptly the desired value that draws according to measurement report is less than one second predetermined threshold, then trigger second incident, switch state to the second state of Current Serving BTS, and remove the upper strata buffer memory to the IAD request.
2. the method for claim 1, it is characterized in that: described step a further comprises: when serving BS is found to satisfy first trigger condition, send the signaling of carrying out metadata cache to IAD, the state of active change simultaneously, to the response message of IAD transmission at upper layer data, IAD did not process response message before receiving signaling, the data cached and processing response message of beginning after receiving signaling.
3. method as claimed in claim 2, it is characterized in that: the described step that sends at the response message of upper layer data to IAD further comprises: serving BS is received the descending upper strata PDCP packet that IAD is sent, it is carried out the segment processing of automatic repeat request layer, and a some automatic repeat request data block that generate mails to subscriber equipment by air interface, receive the response message of all automatic repeat request data blocks that belong to this PDCP packet when serving BS after, it is to the response message of IAD transmission corresponding to this upper strata PDCP packet.
4. method as claimed in claim 2, it is characterized in that: described IAD to the processing method of response message is: after first incident is triggered, IAD is set up the buffer memory of specifying size according to parameter subsidiary in the signaling of receiving to the downlink data of subscriber equipment, the packet that sends to serving BS from IAD is all put into this buffer memory after transmission afterwards, and is full up to buffer memory; After IAD receives that affirmation subscriber equipment that serving BS is beamed back is received the response message of all automatic repeat request data blocks of certain upper layer data bag correspondence, with corresponding packet deletion in the buffer queue; IAD sends it and does not receive that the data of response message deposit in buffer memory according to certain queue discipline, when buffer memory is full, optionally abandons.
5. the method for claim 1, it is characterized in that: described step c further comprises: when serving BS is found to satisfy second trigger condition, send the signaling of cancellation metadata cache to IAD, the state of active change simultaneously, stop to send response message to IAD, IAD kept handling the response message receive before receiving signaling, stop data cached after receiving signaling and no longer handle response message.
6. the method for claim 1, it is characterized in that: described step c further comprises: when the desired value that draws according to measurement report surpasses one the 3rd predetermined threshold and continues a special time, then be judged as and satisfy switching condition, begin to carry out handoff procedure.
7. method as claimed in claim 6 is characterized in that: described first predetermined threshold is greater than described second predetermined threshold and be less than or equal to described the 3rd predetermined threshold.
8. method as claimed in claim 6 is characterized in that: the special time that the special time that described first predetermined threshold continues continues less than described the 3rd predetermined threshold.
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| CN101207905B (en) * | 2006-12-21 | 2011-04-20 | 中兴通讯股份有限公司 | Method and apparatus for switch optimization |
| CN101291291A (en) * | 2008-06-06 | 2008-10-22 | 中兴通讯股份有限公司 | Data processing method, switching method, apparatus and system based on trans-HSGW switching |
| CN101651910A (en) * | 2008-08-12 | 2010-02-17 | 中兴通讯股份有限公司 | Method for sending cell reselection indication |
| CN101754304B (en) * | 2008-12-09 | 2012-11-28 | 中兴通讯股份有限公司 | User face data inverse-transmitting method for realizing the switching across base station |
| CN104105144B (en) * | 2009-01-15 | 2017-11-17 | 华为技术有限公司 | Switch data method for processing forwarding, device and system |
| CN101784033B (en) * | 2009-01-15 | 2014-07-09 | 华为技术有限公司 | Processing method, processing device and processing system for switching data forwarding |
| WO2010142082A1 (en) * | 2009-06-12 | 2010-12-16 | 华为技术有限公司 | Switching process method, relay node and target node |
| RU2656710C2 (en) * | 2013-12-20 | 2018-06-06 | Хуавей Текнолоджиз Ко., Лтд. | Data transmission method and device |
| CN112702769A (en) * | 2019-10-23 | 2021-04-23 | 中国电信股份有限公司 | Data forwarding method and system, user terminal, source base station and target base station |
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