CN105657756A - Network handover method in switching vehicle LTE (Long Term Evolution) UE (User Equipment) cross-EPCs (Evolved Packet Core) - Google Patents
Network handover method in switching vehicle LTE (Long Term Evolution) UE (User Equipment) cross-EPCs (Evolved Packet Core) Download PDFInfo
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- CN105657756A CN105657756A CN201610014502.9A CN201610014502A CN105657756A CN 105657756 A CN105657756 A CN 105657756A CN 201610014502 A CN201610014502 A CN 201610014502A CN 105657756 A CN105657756 A CN 105657756A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention relates to a network handover method in cross-EPC switching. According to the network transfer method in switching vehicle LTE UE cross EPCs, when vehicle terminals are operated cross lines and cross administrations, the behaviors of the terminals are completely taken over by the EPC of a target road bureau; anchor points of data and signaling are handed over from the PGW (Packet Data Network Gateway) of a source EPC to the PGW of a target EPC without loss; in the cross-line switching handover process, the vehicle UE still keeps signaling and data connection with the source PGW through a Home Routed mode; when a target MME (Mobility Management Entity) sends a create session request to a target SGW (Serving Gateway), the target SGW also sends the create session request to the target PGW so as to create a session channel between the target SGW and the target PGW; and the SGW maintains two sets of uplink session contexts of the UE at the same time. According to the method provided by the invention, when switching the vehicle LTE UE cross EPCs, on the premise of ensuring uninterrupted data business, user data surfaces and signaling surfaces are handed over from the source PGW to the target PGW without loss; and seamless handover of the vehicle UE form the source PGW to the target PGW is realized.
Description
Technical field
The present invention relates to a kind of network handoff method when EPC switches, especially relate to a kind of vehicle-mounted LTEUE network handoff method when EPC switches, under keeping the unbroken situation of data link, the lossless switching of source PGW to target PGW can be accomplished.
Background technology
In current LTE3GPP23.401 agreement, regulation UE is when connected state switches across EPC, if keeping the seriality of data surface and signaling plane, need to adopting ownership place route (homerouted) mode, the signalling path before switching is eNB �� source, UE �� source MME �� source SGW �� source PGW, referring to Fig. 1; Data surface passage before switching is SGW �� source, eNB �� source, UE �� source PGW �� operation system, referring to referring to Fig. 2. In order to be maintained at the connected state switching seriality according to face, ownership place routing mode defines the signaling plane after switching by UE �� target eNB �� target MME �� target SGW �� source PGW, referring to Fig. 3, data surface after switching is by UE �� target eNB �� target SGW �� source PGW �� operation system, referring to Fig. 4.
The vehicle-mounted UE of LTE has its special demand in the application of subway and big ferrum, when vehicle-mounted UE cross-line, run across office time, in order to clear in job responsibility, interconnect with the track traffic data network of other standards, reduce the impact that All other routes or road bureau are caused by ownership circuit network fault, possession office is facilitated to carry out the consideration of the aspects such as data service billing, after vehicle-mounted UE is switched to the EPC of target line from the EPC of source circuit, it is necessary in target line, EPC full powers take over the behavior of vehicle-mounted UE. The purpose of do so is after vehicle-mounted UE is switched to target line, the EPC fault on the circuit of source, will not the UE behavior having been switched in target line be impacted, it is possible to avoid the interference to adjacent lines, the normal operation of road bureau of the local network fault.
Current each equipment vendors are realize according to the ownership place routing mode on LTE3GPP across EPC switchover policy, on subway and railway during application, if after vehicle-mounted UE is switched to target line EPC from source circuit EPC, under keeping the unbroken situation of data link, it is impossible to accomplish the lossless switching of source PGW to target PGW.
Summary of the invention
The present invention is directed to prior art deficiency, based on the special applications scene on subway and railway, it is proposed that a kind of vehicle-mounted LTEUE network handoff method when EPC switches. Solve vehicle-mounted LTEUE when EPC switches, under ensureing the unbroken premise of data service, user data face, the signaling plane lossless transfer from source PGW to target PGW, it is achieved the vehicle-mounted UE seamless transfer from source PGW to target PGW.
The technical solution adopted in the present invention:
A kind of vehicle-mounted LTEUE network handoff method when EPC switches, when car-mounted terminal cross-line, run across office time, the behavior of terminal is completely taken over by the EPC of target road bureau, under terminal with the track traffic unbroken premise of operation system data cube computation, it is achieved the anchor point of data and signaling is by the lossless transfer of the PGW under the PGW under the EPC of source to target EPC.
Described vehicle-mounted LTEUE network handoff method when EPC switches, between different EPC during switching, for keeping the PDN seriality connected, switch in hand-over at cross-line, vehicle-mounted UE keeps the connection of signaling and data still through HomeRouted mode and source PGW, when target MME sets up conversation request to target SGW transmission, target SGW sends also can to target PGW simultaneously and set up conversation request, setting up the session channel between target SGW and target PGW, target SGW safeguards the two set uplink session contexts of UE simultaneously.
Described vehicle-mounted LTEUE network handoff method when EPC switches, after the session channel of target SGW Yu source PGW is got through completely, after target MME receives the target SGW ModifyBearerResponse message returned, target MME passes through descending NAS direct-sending message, and the PDN carrying target PGW distribution is connected new IP address to UE; Simultaneously closing off the target SGW session channel to source PGW, UE side carries out the dynamic routing of LAN mouth IP and the new IP of WAN mouth, and the signaling of follow-up vehicle-mounted UE and data path directly walk SGW �� visited place, visited place PGW.
Vehicle-mounted UE is after receiving the target MME descending NAS direct-sending message sent, if the inside choosing carries PDN connects IP address, UE side just updates the route between this IP address and LAN port address, after routing update, UE feeds back to target MME by up NAS direct-sending message, and instruction UE side PDN connection IP address has been updated over complete, after this step, UE side connects IP tunnel by new PDN, sends data to network side.
Beneficial effects of the present invention:
The present invention vehicle-mounted LTEUE network handoff method when EPC switches, under ensureing the unbroken premise of data service, it is achieved that the vehicle-mounted UE seamless transfer from source PGW to target PGW. Can make UE cross-line, run across office time, directly by the EPC seamless pipe being currently located, decrease the switch route time of interoffice, also stopped when source EPC fault, the interference to target EPC place circuit. The function division of each circuit or interoffice can be specified, facilitate data traffic to realize charging and statistics at ownership administration intra-office.
Accompanying drawing explanation
Fig. 1 is prior art UE signaling plane before connected state switches when EPC switches;
Fig. 2 is prior art UE data surface before connected state switches when EPC switches;
Fig. 3 is prior art UE signaling plane after connected state switches when EPC switches;
Fig. 4 is prior art UE data surface after connected state switches when EPC switches;
Fig. 5 is the flow chart of the present invention vehicle-mounted LTEUE network handoff method when EPC switches;
Fig. 6 is the signaling plane after the switching of the present invention vehicle-mounted LTEUE network handoff method when EPC switches;
Fig. 7 is the data surface after the switching of the present invention vehicle-mounted LTEUE network handoff method when EPC switches.
Detailed description of the invention
The present invention vehicle-mounted LTEUE network handoff method when EPC switches, its technology realize it is critical only that: when car-mounted terminal cross-line, run across office time, the behavior of terminal is completely taken over by the EPC of target road bureau, under terminal with the track traffic unbroken premise of operation system data cube computation, it is achieved the anchor point of data and signaling is by the lossless transfer of the PGW under the PGW under the EPC of source to target EPC.
Below by detailed description of the invention, technical scheme is described in further detail.
Embodiment 1
The vehicle-mounted LTEUE of the present embodiment network handoff method when EPC switches, it is achieved process is as follows:
Between different EPC during switching, for keeping the PDN seriality connected, switch in hand-over at cross-line, vehicle-mounted UE keeps the connection of signaling and data still through HomeRouted mode and source PGW, when target MME sets up conversation request to target SGW transmission, target SGW sends also can to target PGW simultaneously and set up conversation request, setting up the session channel between target SGW and target PGW, target SGW safeguards two sets uplink session context (the IP address, user face of source PGW and target PGW and TEID) of UE simultaneously.
Embodiment 2
The vehicle-mounted LTEUE of the present embodiment network handoff method when EPC switches, it is different in that with embodiment 1: further, after the session channel of target SGW Yu source PGW is got through completely, after target MME receives the target SGW ModifyBearerResponse message returned, target MME passes through descending NAS direct-sending message, and the PDN carrying target PGW distribution is connected new IP address to UE; Simultaneously closing off the target SGW session channel to source PGW, UE side carries out the dynamic routing of LAN mouth IP and the new IP of WAN mouth, and the signaling of follow-up vehicle-mounted UE and data path directly walk SGW �� visited place, visited place PGW.
Embodiment 3
The vehicle-mounted LTEUE of the present embodiment network handoff method when EPC switches, it is different in that with embodiment 2: vehicle-mounted UE is after receiving the target MME descending NAS direct-sending message sent, if the inside choosing carries PDN connects IP address, UE side just updates the route between this IP address and LAN port address, after routing update, UE feeds back to target MME by up NAS direct-sending message, instruction UE side PDN connects IP address and has been updated over complete, after this step, UE side connects IP tunnel by new PDN, sends data to network side.
Embodiment 4
The vehicle-mounted LTEUE of the present embodiment network handoff method when EPC switches, is different in that with foregoing embodiments, further,
1) target MME receives the new PDN of UE and connects IP and update after complete instruction, and by ModifyBearerRequest message, the new route in notice target SGWUE side has been updated over complete;
2) target SGW passes through ModifyBearerRequest message, and the data surface IP address and the TEID that carry target eNB side indicate, and notify target PGW, it is possible to send downlink data to UE;
3) target PGW passes through ModifyBearerResponse message to target SGW with response;
4) target SGW passes through ModifyBearerResponse message to target MME with response;
5) target SGW is by DeleteSessionRequest message to source PGW, carries the carrying information etc. of UE, informs source PGW, it is possible to delete the session between the PGW to target SGW of source;
6) source PGW deletes after local session context, by DeleteSessionResponse response target SGW. So far, after step, transferring across EPC of vehicle-mounted UE is just completed.
Embodiment 5
Referring to Fig. 5, Fig. 6, Fig. 7. The present invention vehicle-mounted LTEUE network handoff method when EPC switches, optimized integration is based in LTE3GPP23.401 5.5.1.2 part, specific demand due to subway and railway operation, the IP that the PDN of vehicle-mounted LTEUE connects is configurable to dynamical fashion, namely (WAN mouth) IP that eats dishes without rice or wine of vehicle-mounted UE allows to be dynamic, the IP of wired (LAN mouth) must be static, static concept is the whole network unified planning, unique, the IP of LTEUE is when initiating the request of PDN connection establishment, network side pass to UE's in default bearing activation request message. Between different EPC during switching, the PDN seriality connected can be kept, switch in hand-over at cross-line, vehicle-mounted UE keeps the connection of signaling and data still through HomeRouted mode and source PGW, after the session establishment of target SGW and target PGW, target MME is direct transferred by descending NAS, new PDN connection IP address target EPC being distributed to UE passes through UE, UE side carries out the dynamic routing of LAN mouth IP and the new IP of WAN mouth, and the signaling of follow-up vehicle-mounted UE and data path directly walk SGW �� visited place, visited place PGW.
As it is shown in figure 5, its to implement process step as follows:
1: source eNodeB determines to carry out the switching based on S1, and source eNodeB sends HandoverRequired message to source MME, and this message includes the information such as the EPS carrying of type of message, switching type, target eNBID, target TAI and needs forwarding.
2: source MME selectes suitable target MME, ForwardRelocationRequest message is sent to target MME by S10 interface, comprising main contents and have UEEPSPDNConnections, this cell carries all PDN link informations of this UE and comprises: UEID, UE safe context, UE network capabilities, address and the TEID of source SGW chain of command, APN, PDNaddress, target eNBID, target TAI, LinkedEPSBearerID(default bearing ID) and the BearerContexts etc. of all dedicated bearers that associates with LBI.
In dedicated bearer Contexts, comprise the address of the source SGW in uplink user face and the address in TEID and PGW uplink user face, source and TEID.
3: target MME selectes corresponding target SGW, send CreateSessionRequest message to target SGW, message comprises the context (including address and the TEID of upstream data face source PGW) of each carrying, TEID, the Handover of target MME chain of command indicates, the address (present invention newly increases) etc. of target PGW.
4: target SGW sends, according to target MME, the carrying information of coming, at the context (acquiescence and dedicated bearer) that locally created carrying is relevant, send CreateSessionRequest message to target PGW, message is carried ID and the Qos parameter of IMSI, APN, default bearing and dedicated bearer, signing APN-AMBR, the address in downlink user face, target SGW side and TEID(default bearing and dedicated bearer), and the TEID of chain of command.
Target PGW sends the carrying information in session establishment message according to target SGW, at locally created all carryings (acquiescence is with special) contextual information, IP session is set up with application server, target PGW distributes new PDNIP address to UE, and target PGW carries out the filterID of the filterID of the corresponding dedicated bearer of UE and the IP of far-end server and binds.
5: target PGW sends CreateSessionResponse message to target SGW, carry IP address and the TEID in target PGW uplink user face, and the TEID of chain of command, dedicated bearer ID and Qos, UE the parameter such as new PDNIP address, after this step, target PGW sends downlink user face data (now also not obtaining IP address, user face and the TEID of target eNB, downlink data also cannot be sent) can to target SGW, and target SGW sends uplink user face data can also to target PGW.
6: target SGW returns CreateSessionResponse message to target MME, carries IP address, uplink user face, target SGW side and TEID(default bearing and dedicated bearer), and the new PDNIP address of TEID, the UE of chain of command.
7: target MME sends HandoverRequest message to target eNB, and including contents such as the EPS the to set up lists carried, the information of each EPS carrying includes IP address, uplink user face and the TEID value of target SGW, the Qos etc. of EPS carrying. Target eNB can set up UE context after receiving above-mentioned message, including the information of carrying, safe context etc.
8: target eNB replys HandoverRequestAck message to target MME, wherein comprises EPS carrying and sets up the information of result. Carrying for each EPS being successfully established, its information includes downlink data in the data surface IP address of target eNB side and TEID value. If being absent from X2 interface between target eNB and source eNB, it is necessary to forwarded the words of data by S1 interface, then target eNB is also required to address and the TEID value of data forwarding tunnel are reported target MME.
9: target MME sends CreateIndirectDataForwardingTunnelRequest message to target SGW, the IP address of downlink data forwarding channel and TEID value (target eNB side) are notified target SGW, and forwarding channel has built up from target SGW to target eNB.
9a: target SGW replys CreateIndirectDataForwardingTunnelResponse message. Contain forward Tunnel in the IP address of target SGW side and TEID value.
10: target MME sends ForwardRelocationResponse message to source MME, and EPSBearersSetupResult notifies source MME. When there being forward Tunnel, forward passage IP address and TEID value in target SGW side also can notify source MME in this message.
11: under having forward tunnel situation, source MME sends CreateIndirectDataForwardingTunnelRequest message to source SGW, carrying forwarding channel at the IP address of target SGW side and TEID value notice source SGW, forwarding channel has built up from the SGW to target SGW of source.
11a: source SGW replys CreateIndirectDataForwardingResponse, by the forwarding channel IP address in SGW side, source and TEID value notice source MME. Source MME will be transmitted to source eNB this information.
12: source MME sends HandoverCommand message to source eNB, and address and the TEID of all carryings needing to forward distributed by target eNB inform to source eNB.
12a: source eNB to UE sends RRCConnectionReconfiguration message, carries HandoverCommand instruction, and instruction UE switches the community specified.
13: source eNB sends eNBStatusTransfer message, and this message, through source MME, target MME, eventually arrives at target eNB. This message is by the state notifying target eNB of the PDCP of the EPSBearer of lossless switching.
13a ~ 14: downlink data now can be transmitted to target eNB through IndirectDataForwardingTunnel by source eNB. Downlink data arrives after the eNB of source through source PGW and source SGW, and source eNB finds to need to forward data to target eNB, and first source eNB transmits data to source SGW, source SGW and forward data to target SGW, and data are ultimately forwarded to target eNB by target SGW.
After 15:UE and target eNB sets up synchronization, send HandoverConfirm message to target eNB, now target eNB can also begin to send upstream data by being sent to UE, UE from the source eNB downlink data forwarded, and finally arrives source PGW through target eNB to target SGW.
16: target eNB sends HandoverNotify message to target MME.
17: target MME sends ForwardRelocationCompleteNotification message to source MME.
18: source MME responds ForwardRelocationCompleteAcknowledge message to target MME, and data forwarding is complete, and source MME and target MME starts corresponding intervalometer, in order to after finishing switching, delete corresponding resource.
19: target MME sends ModifyBearerRequest message to target SGW, and the IP address in user face, target eNB side and TEID value are notified target SGW. So the downlink data channel after switching has built up between target SGW to target eNB.
20: target SGW by the IP address of the data surface of target SGW distributed in the 4th step and TEID value, and by ModifyBearerRequest message to source PGW, so the part between the PGW to target SGW of source of the downlink data channel after switching is set up. The so whole down going channel between the PGW to target eNB of source is just set up complete. Downlink data just from source PGW, can arrive UE via target SGW and target eNB.
21: source PGW updates bearer context, distributes the corresponding up dedicated bearer IP address, user face at source PGW and TEID value, by ModifyBearerResponse message to target SGW.
After 22: the target SGW response receiving source PGW, data feedback channel in the target SGW part to source PGW it has been established that target SGW return ModifyBearerResponse message to target MME.
23-24: after target MME receives the target SGW ModifyBearerResponse message returned, by descending NAS direct-sending message, the PDN carrying target PGW distribution connects new IP address to UE.
25-26: vehicle-mounted UE after receiving the target MME descending NAS direct-sending message sent, if the inside choosing carries PDN connects IP address, UE side just updates the route between this IP address and LAN port address, after routing update, UE feeds back to target MME by up NAS direct-sending message, and instruction UE side PDN connection IP address has been updated over complete, after this step, UE side connects IP tunnel by new PDN, sends data to network side.
After this switching flow, the vehicle-mounted UE of LTE shows in cross-line, the below figure 6 of signaling plane after office switches, and data surface flow graph is illustrated in fig. 7 shown below.
27: the target MME new PDN receiving UE connects IP and updates after complete instruction, and by ModifyBearerRequest message, the new route in notice target SGWUE side has been updated over complete.
28: target SGW passes through ModifyBearerRequest message, and the data surface IP address and the TEID that carry target eNB side indicate, and notify target PGW, it is possible to send downlink data to UE.
29: target PGW passes through ModifyBearerResponse message to target SGW with response.
30: target SGW passes through ModifyBearerResponse message to target MME with response.
31: target SGW passes through DeleteSessionRequest message to source PGW, carries the carrying information etc. of UE, informs source PGW, it is possible to deletes the session between the PGW to target SGW of source.
After 32: source PGW deletion local session context, by DeleteSessionResponse response target SGW. So far, after step, transferring across EPC of vehicle-mounted UE is just completed.
Wen Zhong, the terminological interpretation related to is as follows:
3GPP:The3rdGenerationPartnershipProject, third generation partner program; ENB:evolvedNodeB, evolved base station; EPC:EvolvedPacketCore, Evolved Packet Core; LBI:LinkedEPSBearerId, default bearing ID; LTE:LongTermEvolution, 3GPP Long Term Evolution; MME:MobilityManagementEntity, mobile management entity; PDN:PacketDataNetwork, Packet Data Network; PGW:PDNGateway, packet data network gateway; SGW:ServingGateway, gateway; TAI:TrackingAreaIdentity, trace regions identifies; TEID:TunnellingEndpointIndentification, tunnel endpoint identifier; UE:UserEquipment, terminal; QoS:QualityofService, service quality; Cross-line: across the switching of subway line, every subway line has oneself special EPC network; Across office: across the switching of Railway Bureau's circuit, there is oneself special EPC network in each Railway Bureau; Operation system: control the dedicated network of train signal on railway, subway.
Claims (7)
1. the vehicle-mounted LTEUE network handoff method when EPC switches, it is characterized in that: when car-mounted terminal cross-line, run across office time, the behavior of terminal is completely taken over by the EPC of target road bureau, under terminal with the track traffic unbroken premise of operation system data cube computation, it is achieved the anchor point of data and signaling is by the lossless transfer of the PGW under the PGW under the EPC of source to target EPC.
2. the vehicle-mounted LTEUE according to claim 1 network handoff method when EPC switches, it is characterized in that: between different EPC during switching, for keeping the PDN seriality connected, switch in hand-over at cross-line, vehicle-mounted UE keeps the connection of signaling and data still through HomeRouted mode and source PGW, when target MME sets up conversation request to target SGW transmission, target SGW sends also can to target PGW simultaneously and set up conversation request, set up the session channel between target SGW and target PGW, target SGW safeguards the two set uplink session contexts of UE simultaneously.
3. the vehicle-mounted LTEUE according to claim 2 network handoff method when EPC switches, it is characterized in that: after the session channel of target SGW Yu source PGW is got through completely, after target MME receives the target SGW ModifyBearerResponse message returned, target MME passes through descending NAS direct-sending message, and the PDN carrying target PGW distribution is connected new IP address to UE; Simultaneously closing off the target SGW session channel to source PGW, UE side carries out the dynamic routing of LAN mouth IP and the new IP of WAN mouth, and the signaling of follow-up vehicle-mounted UE and data path directly walk SGW �� visited place, visited place PGW.
4. the vehicle-mounted LTEUE according to claim 3 network handoff method when EPC switches, it is characterized in that: vehicle-mounted UE is after receiving the target MME descending NAS direct-sending message sent, if the inside choosing carries PDN connects IP address, UE side just updates the route between this IP address and LAN port address, after routing update, UE feeds back to target MME by up NAS direct-sending message, instruction UE side PDN connects IP address and has been updated over complete, after this step, UE side connects IP tunnel by new PDN, sends data to network side.
5. the network handoff method when EPC switches of the vehicle-mounted LTEUE according to claim 2,3 or 4, it is characterised in that: comprise the following steps that
1) target MME receives the new PDN of UE and connects IP and update after complete instruction, and by ModifyBearerRequest message, the new route in notice target SGWUE side has been updated over complete;
2) target SGW passes through ModifyBearerRequest message, and the data surface IP address and the TEID that carry target eNB side indicate, and notify target PGW, send downlink data to UE;
3) target PGW passes through ModifyBearerResponse message to target SGW with response;
4) target SGW passes through ModifyBearerResponse message to target MME with response;
5) target SGW is by DeleteSessionRequest message to source PGW, carries the carrying information of UE, informs source PGW, deletes the session between the PGW to target SGW of source;
6) source PGW deletes after local session context, by DeleteSessionResponse response target SGW;
So far, transferring across EPC of vehicle-mounted UE is completed.
6. the network handoff method when EPC switches of the vehicle-mounted LTEUE according to any one of Claims 1 to 4, it is characterised in that implement step as follows:
1) source eNodeB determines to carry out the switching based on S1, and source eNodeB sends HandoverRequired message to source MME, and this message includes the EPS carrying information that type of message, switching type, target eNBID, target TAI and needs forward;
2) source MME selectes suitable target MME, ForwardRelocationRequest message is sent to target MME by S10 interface, comprising main contents and have UEEPSPDNConnections, this cell carries all PDN link informations of this UE and comprises: UEID, UE safe context, UE network capabilities, address and TEID, APN, PDNaddress, target eNBID, target TAI, the LinkedEPSBearerID of source SGW chain of command and the BearerContexts of all dedicated bearers associated with LBI; In dedicated bearer Contexts, comprise the address of the source SGW in uplink user face and the address in TEID and PGW uplink user face, source and TEID;
3) target MME selectes corresponding target SGW, send CreateSessionRequest message to target SGW, message comprises the context of each carrying, including address and the TEID of upstream data face source PGW, TEID, the Handover of target MME chain of command indicates, the address of target PGW;
4) target SGW sends, according to target MME, the carrying information of coming, at the context that locally created acquiescence is relevant with dedicated bearer, send CreateSessionRequest message to target PGW, message is carried ID and the Qos parameter of IMSI, APN, default bearing and dedicated bearer, signing APN-AMBR, the address in downlink user face, target SGW side and TEID and the TEID of chain of command;
Target PGW sends the carrying information in session establishment message according to target SGW, in locally created all bearer context information, IP session is set up with application server, target PGW distributes new PDNIP address to UE, and target PGW carries out the filterID of the filterID of the corresponding dedicated bearer of UE and the IP of far-end server and binds;
5) target PGW sends CreateSessionResponse message to target SGW, carry IP address and the TEID in target PGW uplink user face, and the TEID of chain of command, dedicated bearer ID and Qos, UE new PDNIP address parameter, after this step, target PGW sends downlink user face data to target SGW, does not now also obtain IP address, user face and the TEID of target eNB, downlink data also cannot be sent, and target SGW sends uplink user face data can also to target PGW;
6) target SGW returns CreateSessionResponse message to target MME, carries IP address, uplink user face, target SGW side and TEID and the new PDNIP address of TEID, the UE of chain of command;
7) target MME sends IP address, uplink user face and the TEID value that HandoverRequest message includes target SGW to the information that target eNB, each EPS carry, the Qos of EPS carrying; Target eNB can set up UE context after receiving above-mentioned message, including the information of carrying, safe context;
8) target eNB replys HandoverRequestAck message to target MME, wherein comprises EPS carrying and sets up the information of result; Carrying for each EPS being successfully established, its information includes downlink data in the data surface IP address of target eNB side and TEID value;
If being absent from X2 interface between target eNB and source eNB, it is necessary to forwarded the words of data by S1 interface, then target eNB is also required to address and the TEID value of data forwarding tunnel are reported target MME;
9) target MME sends CreateIndirectDataForwardingTunnelRequest message to target SGW, the IP address of downlink data forwarding channel target eNB side and TEID value are notified target SGW, and forwarding channel has built up from target SGW to target eNB;
Target SGW replys CreateIndirectDataForwardingTunnelResponse message, and described information contains forward Tunnel in the IP address of target SGW side and TEID value;
10) target MME sends ForwardRelocationResponse message to source MME, and EPSBearersSetupResult notifies source MME;
When there being forward Tunnel, forward passage IP address and TEID value in target SGW side also can notify source MME in this message;
11) under having forward tunnel situation, source MME sends CreateIndirectDataForwardingTunnelRequest message to source SGW, carrying forwarding channel at the IP address of target SGW side and TEID value notice source SGW, forwarding channel has built up from the SGW to target SGW of source;
11a) source SGW replys CreateIndirectDataForwardingResponse, by the forwarding channel IP address in SGW side, source and TEID value notice source MME;
Source MME will be transmitted to source eNB this information;
12) source MME sends HandoverCommand message to source eNB, and address and the TEID of all carryings needing to forward distributed by target eNB inform to source eNB;
12a) source eNB sends RRCConnectionReconfiguration message to UE, carries HandoverCommand instruction, and instruction UE switches the community specified;
13) source eNB sends eNBStatusTransfer message, and this message, through source MME, target MME, eventually arrives at target eNB;
This message is by the state notifying target eNB of the PDCP of the EPSBearer of lossless switching;
13a ~ 14) downlink data now can be transmitted to target eNB through IndirectDataForwardingTunnel by source eNB;
Downlink data arrives after the eNB of source through source PGW and source SGW, and source eNB finds to need to forward data to target eNB, and first source eNB transmits data to source SGW, source SGW and forward data to target SGW, and data are ultimately forwarded to target eNB by target SGW;
15) after UE and target eNB sets up synchronization, send HandoverConfirm message to target eNB, now target eNB can also begin to send upstream data by being sent to UE, UE from the source eNB downlink data forwarded, and finally arrives source PGW through target eNB to target SGW;
16) target eNB sends HandoverNotify message to target MME;
17) target MME sends ForwardRelocationCompleteNotification message to source MME;
18) source MME responds ForwardRelocationCompleteAcknowledge message to target MME, and data forwarding is complete, and source MME and target MME starts corresponding intervalometer, in order to after finishing switching, delete corresponding resource;
19) target MME sends ModifyBearerRequest message to target SGW, and the IP address in user face, target eNB side and TEID value are notified target SGW;
20) target SGW is by the IP address of the data surface of target SGW distributed in the 4th step and TEID value, and by ModifyBearerRequest message to source PGW, so the part between the PGW to target SGW of source of the downlink data channel after switching is set up;
21) source PGW updates bearer context, distributes the corresponding up dedicated bearer IP address, user face at source PGW and TEID value, by ModifyBearerResponse message to target SGW;
22) after target SGW receives the response of source PGW, data feedback channel in the target SGW part to source PGW it has been established that target SGW return ModifyBearerResponse message to target MME.
7. the described vehicle-mounted LTEUE according to claim 6 network handoff method when EPC switches, it is characterised in that comprise the following steps that
23-24) after target MME receives the target SGW ModifyBearerResponse message returned, by descending NAS direct-sending message, the PDN carrying target PGW distribution connects new IP address to UE;
25-26) vehicle-mounted UE is after receiving the target MME descending NAS direct-sending message sent, if the inside choosing carries PDN connects IP address, UE side just updates the route between this IP address and LAN port address, after routing update, UE feeds back to target MME by up NAS direct-sending message, and instruction UE side PDN connection IP address has been updated over complete, after this step, UE side connects IP tunnel by new PDN, sends data to network side;
27) target MME receives the new PDN of UE and connects IP and update after complete instruction, and by ModifyBearerRequest message, the new route in notice target SGWUE side has been updated over complete;
28) target SGW passes through ModifyBearerRequest message, and the data surface IP address and the TEID that carry target eNB side indicate, and notify target PGW, send downlink data to UE;
29) target PGW passes through ModifyBearerResponse message to target SGW with response;
30) target SGW passes through ModifyBearerResponse message to target MME with response;
31) target SGW is by DeleteSessionRequest message to source PGW, carries the carrying information of UE, informs source PGW, it is possible to delete the session between the PGW to target SGW of source;
32) after source PGW deletes local session context, by DeleteSessionResponse response target SGW; So far, transferring across EPC of vehicle-mounted UE is completed.
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