CN107659970A - A kind of packet path conversion method for S1 switchings - Google Patents

A kind of packet path conversion method for S1 switchings Download PDF

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Publication number
CN107659970A
CN107659970A CN201610592877.3A CN201610592877A CN107659970A CN 107659970 A CN107659970 A CN 107659970A CN 201610592877 A CN201610592877 A CN 201610592877A CN 107659970 A CN107659970 A CN 107659970A
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China
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epc
target
base station
source base
message
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CN201610592877.3A
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卫琳
喻炜
严玉平
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Potevio Information Technology Co Ltd
Putian Information Technology Co Ltd
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Putian Information Technology Co Ltd
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Priority to CN201610592877.3A priority Critical patent/CN107659970A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention provides a kind of packet path conversion method for S1 switchings, including：When be changed without MME S1 switchings, and determining without data forwarding, before UE and target BS complete uplink synchronous, S1 downlink users face tunnel destination node is updated.The present processes cause EPC to know that certain carrying need not carry out data forwarding in handoff preparation phase, that is, carry out path switching and data transmission, it is possible to reduce loss of the downlink data in handoff procedure.

Description

A kind of packet path conversion method for S1 switchings
Technical field
The present invention relates to communication technical field, more particularly, to a kind of packet path conversion side for S1 switchings Method.
Background technology
At present in the communication system based on LTE technologies, EPC points of Evolved Packet Core device is control face entity MME Directly it is connected with user entity UPE system architectures evolution gateway SGW, evolved node eNB with EPC.To keep the steady of system Strong property, LTE system support switching.With there is S1 interfaces in eNB, for eNB with realizing data between MME/SGW between MME/SGW Send and Signalling exchange, be joined directly together by X2 interface between eNB.
In being switched between eNB by X2 mouths, A3 or A4 trigger events report, when Target cell and cell-of-origin are belonging respectively to difference ENB when, trigger eNB between X2 switching, on condition that being configured with X2 interface between 2 eNB.In the measurement that eNB receives UE when source Report, and adjudicate UE to target eNB switch when, the money of Target cell can be completed directly by X2 interface to target eNB application resources Source preparation, UE is notified to switch to Target cell by the reallocation message eated dishes without rice or wine afterwards, after handover success, target eNB notices source ENB discharges the Radio Resource of original cell.Additionally give the data forwarding that source eNB is not sent to target eNB, and update user The node relationships of plane and control plane.
ENB by S1 mouths switch in, S1 switching flow it is similar with X2, difference be investigate whether be configured with eNB it Between X2 links.If being configured without X2 links, the switching of S1 mouths is walked in the switching between eNB；If being configured with X2 and S1 links simultaneously, X2 switchings are preferentially walked in switching between eNB.Switch if selected for S1, then Handover Request, Handover Request Acknowledge and data forwarding need S1 mouths to forward, and general most of switching is still based on S1 switchings.
Fig. 1 is the flow chart for the S1 switching methods for not changing MME, as shown in figure 1, in handoff preparation phase, source base station according to According to the report of measurement configuration, judgement is switched over, finds optimal Target cell；Source base station initiates handover request message to EPC.
After EPC receives handover request message, the user plane tunnel end for sending upstream data to EPC for target BS is distributed Node, handover request message is initiated to target BS according to the Target cell ID carried in message.
Target BS distributes the user plane tunnel destination node for sending downlink data to target BS for EPC, while to EPC Send handover request ack message.
Switching implementation phase, source base station to UE send switching command message, it is rear to EPC send eNB state transfers disappear Breath.EPC is by sending MME state transfer message backs to target BS.Now source base station and EPC start to target BS forward Data, the data that target BS transfers before caching.
In the switching completion stage, after UE receives switching command, stop sending upstream data to source base station, and according in message Instruction complete and the uplink synchronous of target BS.UE sends instruction handoff completion message to Target cell, and then UE starts to send out Upstream data is sent, target BS starts to send the descending forwarding data of caching.
Target BS receives switching and completed after indicating message, sends handoff completion message to EPC, EPC triggering resource releases Flow.
Data forwarding process be defined as in agreement it is optional realize step, if there is no data forwarding process, switching method Flow chart be illustrated in fig. 2 shown below, relative to Fig. 1 sequential, forwarding data does not occur for source base station and EPC, be directly entered it is synchronous and Switch the sequential completed.
As above two flows be can see, and data are sent to source base station by EPC always in handoff procedure, logical until receiving switching Just data can be sent to target BS after knowing.UE just no longer receives lower line number after receiving switching command message from source base station According to.If data forwarding is not implemented, then if the downlink data that source base station receives is not transmitted to before switching command is sent UE, then it can be maintained in source base station.When source base station carries out the release of UE contexts after switching is completed, these data can be deleted Remove.Therefore when not realizing data forwarding, downlink data has substantial amounts of loss in handoff procedure.
The content of the invention
The present invention provides a kind of number for being used for S1 switchings for overcoming above mentioned problem or solving the above problems at least in part According to bag path changing method.
According to an aspect of the present invention, there is provided a kind of packet path conversion method for S1 switchings, including：When entering Row is changed without MME S1 switchings, and when determining without data forwarding, before UE and target BS complete uplink synchronous, more New S1 downlink users face tunnel destination node.
Wherein, it is described before UE and target BS complete uplink synchronous, update S1 downlink users face tunnel destination node, tool Body refers to：EPC sends switching command to source base station, and EPC receives the eNB state transfer message of source base station, transmits MME state transfers Message updates S1 downlink users face tunnel destination node afterwards to target BS.
Wherein, after renewal S1 downlink users face tunnel destination node, EPC sends downlink data to target BS.
Wherein, methods described also includes：When be changed without MME S1 switchings, determine that EPC is linked into target base in UE Tunnel destination node in S1 downlink users face is have updated before standing, after UE accesses Target cell, EPC no longer updates S1 downlink users Face tunnel destination node.
Wherein, methods described is specially：
Step 1, source base station initiates handover request according to UE measurement reporting message to EPC；After EPC confirms switching, to mesh Mark base station and initiate handover request；
Step 2, target BS confirms that switching is received, and informs EPC；EPC sends switching command to source base station；
Step 3, source base station sends eNB state transfers message and MME state transfer message is sent into target base to EPC, EPC Stand, execution route switching, EPC sends downlink data to target BS；
Step 4, UE and Target cell complete uplink synchronous, and handoff completion message, target BS hair are sent to target BS Switching notice is sent to judge to be updated over S1 downlink users face tunnel destination node, triggering source base station release UE is context-sensitive to EPC Resource.
The present processes cause EPC to know whether certain carrying needs to carry out data forwarding in handoff preparation phase, for Without the carrying of data forwarding, the present invention can reduce loss of the downlink data in handoff procedure.
Brief description of the drawings
Fig. 1 is the timing diagram for the S1 switching methods for not changing MME in the prior art；
Fig. 2 is the timing diagram of the S1 switching methods of no data forward in the prior art；
Fig. 3 is the timing diagram for being used for the packet path conversion method that S1 switches according to the embodiment of the present invention.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement below Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
Generally speaking, the application provides a kind of packet path conversion method for S1 switchings, including：When carrying out not more When changing MME S1 switchings, if without data forwarding, advancing updating S1 downlink users face tunnel destination node；When EPC is to source base Stand after sending switching command, if the eNB state transfer message that subsequently received source base station is sent, EPC starts to target Base station sends downlink data.
Further, this method also includes：When be changed without MME S1 switchings, if EPC is linked into target base in UE S1 downlink users face tunnel destination node is have updated before standing, after UE accesses Target cell, it is descending that EPC will not update S1 again User plane tunnel destination node.
Fig. 3 is a kind of flow chart for being used for the packet path conversion method that S1 switches according to the embodiment of the present invention, such as Shown in Fig. 3, this method specifically includes：
UE is according to the criterion of measurement configuration to the eNB reporting measurement reports where itself；Now upstream data is sent to source Base station, downlink data are sent to source base station by EPC；
Source base station determines UE switching based on the measurement report that wireless resource management information and UE are reported；
Source base station sends service switching demand, such as cluster and unicast service switching demand to EPC, and transmitted information will Element has a detailed description in 3GPP agreements 36.413.
EPC performs handoff procedure, to target BS signalling of bouquet and unicast service handover request message, in each service message Appearance is shown in that agreement provides；
Target BS switches over call access control, and target BS is excellent according to current resources occupation situation and/or business First level determines whether receiving UE service switchover, and specific judging process is not related to the solution of the present invention, will not be repeated here.If Target BS can not receive this group of business, then send switch failure information to EPC, represent handoff failure；
If target BS receives this group of business, target BS is to EPC signalling of bouquet and unicast service switching request response Message；After EPC receives the handover request ack message of target BS hair, the reception downlink data of target BS can be obtained Address；
EPC sends switching command to source base station；Source base station sends switching command to UE；
Source base station sends eNB state transfer message to EPC, by the PDCP sequence of source base station in up-link Row number and Hyper Frame Number are sent to EPC；
EPC receives the eNB state transfer message of source base station, is transferred to target BS；
Now, switched for the carrying without data forwarding, EPC execution routes, by the downlink data transmission road of correlation Line translation is entered in footpath, and EPC no longer sends data to source base station, but sends data to target BS；It is, under triggering renewal S1 Row user plane tunnel destination node, afterwards EPC to target BS send downlink data；Because at this moment UE is also without access target base Stand, so by these data buffer storages, UE is handed down to after UE is linked into Target cell again for target BS.
After the Target cell that UE and target BS belong to together completes down-going synchronous, the data of Target cell are received, are completed up It is synchronous；
UE sends switching to target BS and completes instruction message, and target BS sends handoff notification message to EPC.
After EPC receives handoff notification message, judge whether to be updated over S1 downlink users face tunnel destination node (namely road Footpath switches), if being updated over, S1 downlink users face tunnel destination node will not be updated again；
EPC sends UE context release commands, instruction source base station release UE related resources, while trigger source base to source base station S1 interface logics connection related the release UE that stands；The rear of source base station sends UE context Release completes to EPC.
It can be seen that when EPC receives handoff requirement message, it can know whether the carrying needs to carry out data forwarding, Carrying advancing updating S1 downlink user face tunnel destination nodes of the EPC only to not performing data forwarding.
Finally, the present processes are only preferable embodiment, are not intended to limit the scope of the present invention.It is all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., the protection of the present invention should be included in Within the scope of.

Claims (10)

  1. A kind of 1. packet path conversion method for S1 switchings, it is characterised in that including：As the S1 for be changed without MME When switching, and determining without data forwarding, before UE and target BS complete uplink synchronous, renewal S1 downlink users face tunnel Road destination node.
  2. 2. according to the method for claim 1, it is characterised in that it is described before UE and target BS complete uplink synchronous, S1 downlink users face tunnel destination node is updated, is referred specifically to：EPC sends switching command to source base station, and EPC receives source base station ENB state transfer message, transmission MME state transfers message update S1 downlink users face tunnel destination node afterwards to target BS.
  3. 3. according to the method for claim 1, it is characterised in that after renewal S1 downlink users face tunnel destination node, EPC sends downlink data to target BS.
  4. 4. according to the method for claim 1, it is characterised in that methods described also includes：When the S1 for be changed without MME is cut When changing, determine that EPC have updated S1 downlink users face tunnel destination node, UE access targets before UE is linked into target BS After cell, EPC no longer updates S1 downlink users face tunnel destination node.
  5. 5. according to the method for claim 1, it is characterised in that methods described is specially：
    Step 1, source base station initiates handover request according to UE measurement reporting message to EPC；After EPC confirms switching, to target base Stand and initiate handover request；
    Step 2, target BS confirms that switching is received, and informs EPC；EPC sends switching command to source base station；
    Step 3, source base station sends eNB state transfers message and MME state transfer message is sent into target BS to EPC, EPC, Execution route switches, and EPC sends downlink data to target BS；
    Step 4, UE and Target cell complete uplink synchronous, send handoff completion message to target BS, target BS sends and cut Notice is changed to EPC, judges to be updated over S1 downlink users face tunnel destination node, the triggering source base station release context-sensitive moneys of UE Source.
  6. 6. according to the method for claim 5, it is characterised in that step 1 specifically includes：
    UE is according to the criterion of measurement configuration to the eNB reporting measurement configuration reports where itself；
    Source base station is based on wireless resource management information and determines UE switchings with UE reporting measurement reports；
    Source base station sends service switching demand to EPC；
    EPC confirms switching, and service switching request message is sent to target BS.
  7. 7. according to the method for claim 5, it is characterised in that step 2 specifically includes：
    Target BS switches over call access control, confirms to receive this group of business, target BS sends service switching request to EPC and rung Answer message；
    EPC receives the handover request ack message of target BS hair, obtains the address of the reception downlink data of target BS；
    EPC sends switching command to source base station；Source base station sends switching command to UE.
  8. 8. according to the method for claim 5, it is characterised in that step 3 specifically includes：
    Source base station sends eNB state transfer message to EPC, and source base station PDCP sequence number and Hyper Frame Number are sent To EPC；
    EPC receives the eNB state transfer message of source base station, and transmission MME state transfer message is to target BS；
    For the carrying without data forwarding, EPC execution routes are switched, and the downlink data transmission path of correlation is become Change, EPC directly sends data to target BS；
    Data buffer storage is waited UE to be handed down to UE after being linked into Target cell by target BS.
  9. 9. according to the method for claim 5, it is characterised in that step 4 specifically includes：
    After the Target cell that UE and target BS belong to together completes down-going synchronous, the data of Target cell are received, complete uplink synchronous；
    UE sends switching to target BS and completes instruction message, and target BS sends handoff notification message to EPC；
    After EPC receives handoff notification message, judge whether to be updated over S1 downlink users face tunnel destination node, if being updated over, S1 downlink users face tunnel destination node will not be then updated again.
  10. 10. according to the method for claim 1, it is characterised in that methods described further comprises：
    When EPC receives handover request message, know whether the carrying needs to carry out data forwarding；
    Carrying advancing updating S1 downlink user face tunnel destination nodes of the EPC only to not performing data forwarding.
CN201610592877.3A 2016-07-25 2016-07-25 A kind of packet path conversion method for S1 switchings Pending CN107659970A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021031212A1 (en) * 2019-08-22 2021-02-25 Oppo广东移动通信有限公司 Information processing method and terminal device

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CN101212790A (en) * 2006-12-25 2008-07-02 中兴通讯股份有限公司 Data packet route switching method in mobile communication system
CN101577950A (en) * 2009-06-05 2009-11-11 西安电子科技大学 Method for enhancing handover based on cell prediction
EP2123085A2 (en) * 2007-03-21 2009-11-25 Telefonaktiebolaget LM Ericsson (PUBL) Selective packet forwarding for lte mobility
CN101888675A (en) * 2009-05-14 2010-11-17 中兴通讯股份有限公司 Cross-base station switching method and system in long term evolution system
CN102215537A (en) * 2010-04-09 2011-10-12 华为技术有限公司 Switching method, evolved Node B (eNodeB) and home gateway

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101212790A (en) * 2006-12-25 2008-07-02 中兴通讯股份有限公司 Data packet route switching method in mobile communication system
EP2123085A2 (en) * 2007-03-21 2009-11-25 Telefonaktiebolaget LM Ericsson (PUBL) Selective packet forwarding for lte mobility
CN101888675A (en) * 2009-05-14 2010-11-17 中兴通讯股份有限公司 Cross-base station switching method and system in long term evolution system
CN101577950A (en) * 2009-06-05 2009-11-11 西安电子科技大学 Method for enhancing handover based on cell prediction
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021031212A1 (en) * 2019-08-22 2021-02-25 Oppo广东移动通信有限公司 Information processing method and terminal device
CN113508616A (en) * 2019-08-22 2021-10-15 Oppo广东移动通信有限公司 Information processing method and terminal equipment

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