CN105657756B - Network handoff method when across the EPC switching of vehicle-mounted LTE UE - Google Patents
Network handoff method when across the EPC switching of vehicle-mounted LTE UE Download PDFInfo
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- CN105657756B CN105657756B CN201610014502.9A CN201610014502A CN105657756B CN 105657756 B CN105657756 B CN 105657756B CN 201610014502 A CN201610014502 A CN 201610014502A CN 105657756 B CN105657756 B CN 105657756B
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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
-
- 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
-
- 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
-
- 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
-
- 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
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention relates to a kind of network handoff methods when across EPC switching.A kind of network handoff method when across the EPC switching of vehicle-mounted LTE UE, when car-mounted terminal cross-line, across office operation, it completely takes over the behavior of terminal by the EPC of target road bureau, realizes the anchor point of data and signaling by the lossless transfer of the PGW under the PGW under the EPC of source to target EPC.In cross-line switches hand-over, vehicle-mounted UE keeps the connection of signaling and data still through Home Routed modes and source PGW, when target MME establishes session request to target SGW transmissions, target SGW also can establish session request to target PGW transmissions simultaneously, to establish the session channel between target SGW and target PGW, target SGW while two sets of uplink session contexts for safeguarding UE.When the present invention solves vehicle-mounted LTE UE across EPC switchings, under the premise of ensureing that data service is unbroken, the lossless transfer of user data face, signaling plane from source PGW to target PGW realizes vehicle-mounted UE from source PGW to the seamless transfer of target PGW.
Description
Technical field
The present invention relates to a kind of network handoff methods when across EPC switching, more particularly, to a kind of vehicle-mounted LTE UE across EPC
Network handoff method when switching is keeping data link unbroken, source PGW can be accomplished to the lossless of target PGW
Switching.
Background technology
In current 23.401 agreements of LTE 3GPP provide UE in across the EPC switching of connected state, if keep data surface with
The continuity of signaling plane need to use ownership place to route（homerouted）Mode, the signalling path before switching are the sources the UE sources eNB
The sources the MME sources SGW PGW, referring to Fig. 1；Data surface channel before switching is the sources the UE sources the eNB sources SGW PGW operation systems, referring to Fig. 2.
In order to be maintained at continuity of the connected state switching according to face, ownership place routing mode defines the signaling plane after switching by UE mesh
ENB target MME target SGW source PGW are marked, referring to Fig. 3, the data surface after switching is by the sources UE target eNB target SGW PGW business system
System, referring to Fig. 4.
The vehicle-mounted UE of LTE above have its special demand in the application of subway and big iron, when vehicle-mounted UE is in cross-line, across office operation
When, in order to clear in job responsibility, the rail traffic data network with other standards interconnects, and reduces ownership circuit network failure to it
The considerations of being influenced caused by his circuit or road bureau, possession office is facilitated to carry out data service billing etc., when vehicle-mounted UE is from source line
After the EPC on road is switched to the EPC of target line, EPC full powers in target line is needed to take over the behavior of vehicle-mounted UE.The mesh done so
Be the EPC failures on the circuit of source after vehicle-mounted UE is switched to target line, will not be to having been switched to the UE in target line
Behavior impacts, interference that can be to avoid local network failure to the normal operation of adjacent lines, road bureau.
Current each across EPC switchover policy of equipment vendors is realized according to the ownership place routing mode on LTE 3GPP, on ground
On iron and railway in application, if vehicle-mounted UE after source circuit EPC is switched to target line EPC, keep data link not in
In the case of disconnected, it cannot accomplish the lossless switching of source PGW to target PGW.
Invention content
The present invention is in view of the shortcomings of the prior art, based on the special applications scene on subway and railway, it is proposed that Yi Zhongche
Carry network handoff method when across the EPC switching of LTE UE.When solving across the EPC switchings of vehicle-mounted LTE UE, ensureing data service
Under the premise of unbroken, the lossless transfer of user data face, signaling plane from source PGW to target PGW realizes vehicle-mounted UE from source PGW
To the seamless transfer of target PGW.
The technical solution adopted in the present invention：
A kind of network handoff method when across the EPC switching of vehicle-mounted LTE UE, when car-mounted terminal cross-line, across office operation, by
The EPC of target road bureau completely takes over the behavior of terminal, in terminal and the unbroken premise of rail traffic operation system data connection
Under, realize the anchor point of data and signaling by the lossless transfer of the PGW under the PGW under the EPC of source to target EPC.
Network handoff method when across the EPC switchings of the vehicle-mounted LTE UE, when switching between different EPC, to protect
The continuity for holding PDN connections, in cross-line switches hand-over, vehicle-mounted UE is protected still through Home Routed modes and source PGW
The connection for holding signaling and data, when target MME establishes session request to target SGW transmissions, target SGW also can give target simultaneously
Session request is established in PGW transmissions, and to establish the session channel between target SGW and target PGW, target SGW safeguards UE's simultaneously
Two sets of uplink session contexts.
Network handoff method when across the EPC switchings of the vehicle-mounted LTE UE, when the session channel of target SGW and source PGW
After getting through completely, after target MME receives the Modify Bearer Response message that target SGW is returned, target MME is logical
Downlink NAS direct-sending messages are crossed, the PDN connection new IP address that carrying target PGW is distributed is to UE；Target SGW is simultaneously closed off to source
The session channel of PGW, the sides UE carry out the dynamic routing of LAN mouthfuls of IP and WAN mouthfuls of new IP, the signaling and data path of follow-up vehicle-mounted UE
Directly walk target SGW and target PGW.
Vehicle-mounted UE is after receiving the downlink NAS direct-sending messages that target MME is sent, if the inside choosing carries PDN connections
IP address, the sides UE just update the routing between the IP address and LAN port address, and after routing update, UE passes through uplink NAS
Direct-sending message feeds back to target MME, and instruction UE side PDN connections IP address, which has been updated over, to be finished, and after this step, the sides UE pass through new
PDN connection IP tunnels, send data to network side.
Beneficial effects of the present invention：
Network handoff method when across the EPC switchings of the vehicle-mounted LTE UE of the present invention, in the guarantee unbroken premise of data service
Under, vehicle-mounted UE is realized from source PGW to the seamless transfer of target PGW.UE can be made in cross-line, across office operation, directly by working as
The EPC seamless pipes at preceding place reduce the interchanger route time of interoffice, have also prevented when source EPC failures, to target
The interference of circuit where EPC.The function that each circuit or interoffice can be specified divides, and facilitates data traffic real in ownership administration intra-office
Existing charging and statistics.
Description of the drawings
Fig. 1 is the signaling plane before prior art UE switches in across the EPC switching of connected state；
Fig. 2 is the data surface before prior art UE switches in across the EPC switching of connected state；
Fig. 3 is the signaling plane after prior art UE switches in across the EPC switching of connected state；
Fig. 4 is the data surface after prior art UE switches in across the EPC switching of connected state；
The flow chart of network handoff method when Fig. 5 is the vehicle-mounted LTE UE of the present invention across EPC switchings；
Network handoff method when Fig. 6 is the vehicle-mounted LTE UE of the present invention across EPC switchings switch after signaling plane；
Network handoff method when Fig. 7 is the vehicle-mounted LTE UE of the present invention across EPC switchings switch after data surface.
Specific implementation mode
Network handoff method when across the EPC switchings of the vehicle-mounted LTE UE of the present invention, the key of technology realization are：When vehicle-mounted
When terminal cross-line, across office operation, the behavior of terminal is completely taken over by the EPC of target road bureau, in terminal and rail traffic business system
Under the premise of data connection of uniting is unbroken, the anchor point of realization data and signaling is by the PGW's under the PGW under the EPC of source to target EPC
Lossless transfer.
Below by specific implementation mode, technical scheme of the present invention will be described in further detail.
Embodiment 1
Network handoff method when across the EPC switching of the vehicle-mounted LTE UE of the present embodiment, realizes that process is as follows：
It is vehicle-mounted in cross-line switches hand-over to keep the continuity of PDN connections when switching between different EPC
UE keeps the connection of signaling and data still through Home Routed modes and source PGW, is built to target SGW transmissions in target MME
When vertical session request, target SGW also can establish session request to target PGW transmissions simultaneously, to establish target SGW and target PGW
Between session channel, target SGW safeguards two sets of uplink session contexts of UE simultaneously（The user plane IP of source PGW and target PGW
Address and TEID）.
Embodiment 2
Network handoff method when across the EPC switching of the vehicle-mounted LTE UE of the present embodiment, exists with the difference of embodiment 1
In：Further, after the session channel of target SGW and source PGW is got through completely, when target MME receives what target SGW was returned
After Modify Bearer Response message, target MME is by downlink NAS direct-sending messages, the PGW distribution of carrying target
PDN connection new IP address is to UE；The session channel of target SGW to source PGW is simultaneously closed off, the sides UE carry out LAN mouthfuls of IP and WAN mouthfuls new
The dynamic routing of IP, the signaling and data path of follow-up vehicle-mounted UE directly walk target SGW and target PGW.
Embodiment 3
Network handoff method when across the EPC switching of the vehicle-mounted LTE UE of the present embodiment, exists with the difference of embodiment 2
In：Vehicle-mounted UE is after receiving the downlink NAS direct-sending messages that target MME is sent, if the inside choosing is with carrying PDN connections IP
Location, the sides UE just update the routing between the IP address and LAN port address, and after routing update, UE is direct transferred by uplink NAS
Message feedback gives target MME, and instruction UE side PDN connections IP address, which has been updated over, to be finished, and after this step, the sides UE pass through new PDN
IP tunnel is connected, network side is sent data to.
Embodiment 4
Network handoff method when across the EPC switching of the vehicle-mounted LTE UE of the present embodiment, it is different from foregoing embodiments it
Be in, further,
1）Target MME receive UE new PDN connections IP update finish instruction after, pass through Modify Bearer
Request message, the new routing in the sides notice target SGW UE, which has been updated over, to be finished；
2）Target SGW by Modify Bearer Request message, carry the sides target eNB data surface IP address and
TEID is indicated, and is notified target PGW, can be sent downlink data to UE；
3）Target PGW is by Modify Bearer Response message to target SGW with response；
4）Target SGW is by Modify Bearer Response message to target MME with response；
5）Target SGW gives source PGW by Delete Session Request message, carries the carrying information etc. of UE, accuses
Know source PGW, the session between source PGW to target SGW can be deleted；
6）After source PGW deletes local session context, pass through Delete Session Response response targets SGW.Extremely
After this step, across EPC transfer of vehicle-mounted UE is just completed.
Embodiment 5
Referring to Fig. 5, Fig. 6, Fig. 7.Network handoff method when across the EPC switchings of the vehicle-mounted LTE UE of the present invention, optimized integration are
Based on the parts 5.5.1.2 in LTE 3GPP 23.401, due to the specific demand of subway and railway operation, the PDN of vehicle-mounted LTE UE
The IP of connection is configurable to dynamical fashion, i.e., vehicle-mounted UE's eats dishes without rice or wine（WAN mouthfuls）IP allow be it is dynamic, it is wired（LAN mouthfuls）'s
IP must be static, static concept be the whole network unified planning, it is unique, the IP of LTE UE is to initiate PDN connections foundation
When request, pass to UE's in default bearing activates request message by network side.It, can be with when switching between different EPC
The continuity for keeping PDN connections, in cross-line switches hand-over, vehicle-mounted UE is still through Home Routed modes and source PGW
The connection for keeping signaling and data, after the session establishment of target SGW and target PGW, target MME is direct transferred by downlink NAS,
The new PDN connections IP address that target EPC distributes to UE passes through UE, and the sides UE carry out the dynamic road of LAN mouthfuls of IP and WAN mouthfuls of new IP
By the signaling and data path of follow-up vehicle-mounted UE directly walk target SGW and target PGW.
As shown in figure 5, steps are as follows for its specific implementation flow：
1：ENodeB decisions in source carry out the switching based on S1, and source eNodeB sends Handover Required to source MME and disappears
Breath, the message include type of message, switching type, target eNB ID, target TAI and need the information such as the EPS forwarded carryings.
2：Source MME selectes suitable target MME, and sending Forward Relocation Request by S10 interfaces disappears
It ceases and gives target MME, including the main contents include UE EPS PDN Connections, all PDN that this cell carries the UE connect
Connecing information includes：UE ID, UE safe contexts, UE network capabilities, the address of source SGW control planes and TEID, APN, PDN
Address, target eNB ID, target TAI, Linked EPS Bearer ID（The ID of default bearing）And it is associated with LBI
Bearer Contexts of all dedicated bearers etc..
In dedicated bearer Contexts, including the address of the source SGW in uplink user face and TEID and source PGW uplinks are used
The address in family face and TEID.
3：Target MME selectes corresponding target SGW, sends Create Session Request message to target SGW, disappears
Include the context each carried in breath（Address including upstream data face source PGW and TEID）, target MME control planes
TEID, Handover instruction, target PGW address（The present invention newly increases）Deng.
4：The relevant context of carrying is being locally created in the carrying information that target SGW is sent according to target MME（Acquiescence
And dedicated bearer）, send Create Session Request message and arrive target PGW, carrying IMSI, APN, acquiescence are held in message
It carries and ID the and Qos parameters of dedicated bearer, signing APN-AMBR, the address in the sides target SGW downlink user face and TEID（Acquiescence is held
Load and dedicated bearer）And the TEID of control plane.
Target PGW sends the carrying information in session establishment message according to target SGW, and all carryings are being locally created（It is silent
Recognize with it is special）Contextual information establishes IP sessions with application server, and target PGW distributes new PDN IP address, target to UE
PGW carries out the filter ID of the corresponding dedicated bearers of UE and the filter ID of the IP of far-end server are bound.
5：Target PGW sends Create Session Response message to target SGW, carries target PGW uplink users
The parameters such as the new PDN IP address of the IP address and TEID in face and the TEID of control plane, dedicated bearer ID and Qos, UE, through this
After step, target PGW can give target SGW to send downlink user face data（With not obtaining the user plane IP of target eNB also at this time
Location and TEID, downlink data can not also be sent out）, target SGW can also give target PGW to send uplink user face data.
6：Target SGW returns to Create Session Response message and gives target MME, carries the sides target SGW uplink and uses
Family face IP address and TEID（Default bearing and dedicated bearer）And the new PDN IP address of the TEID of control plane, UE.
7：Target MME sends Handover Request message and gives target eNB, including the EPS to be established carryings
The contents such as list, the information that each EPS is carried include the uplink user face IP address and TEID values of target SGW, EPS carryings
Qos etc..Target eNB can establish UE contexts after receiving above-mentioned message, include the information of carrying, safe context etc..
8：Target eNB replys Handover Request Ack message and gives target MME, wherein establishing knot comprising EPS carryings
The information of fruit.The EPS carryings being successfully established for each, information include downlink data in the data surface IP of the sides target eNB
Location and TEID values.If X2 interface is not present between target eNB and source eNB, need if forwarding data by S1 interfaces, that
Target eNB is also required to the address of data forwarding tunnel and TEID values being reported to target MME.
9：Target MME sends Create Indirect Data Forwarding Tunnel Request message to target
SGW, by the IP address of downlink data forwarding channel and TEID values（The sides target eNB）Notify target SGW, forwarding channel is from target
It is had built up between SGW to target eNB.
9a：Target SGW replys Create Indirect Data Forwarding Tunnel Response message.Packet
Contained forward Tunnel the sides target SGW IP address and TEID values.
10：Target MME sends Forward Relocation Response message and gives source MME, by EPS Bearers
Setup Result notify source MME.In the case where there is forward Tunnel, forward channel the sides target SGW IP address and
TEID values can also notify source MME in this message.
11：Create Indirect DataForwarding Tunnel are sent in the case that having forward tunnel, source MME
Request message gives source SGW, carries IP address and TEID value of the forwarding channel in the sides target SGW and notifies source SGW, forwarding channel
It is had built up from source SGW to target SGW.
11a：Source SGW replys Create Indirect DataForwarding Response, by forwarding channel in source
The IP address and TEID values of the sides SGW notify source MME.Source MME will be transmitted to this information source eNB.
12：Source MME sends Handover Command message and gives source eNB, the needs that target eNB is distributed is forwarded all
The address of carrying and TEID notify to give source eNB.
12a：Source eNB sends RRCConnectionReconfiguration message to UE, carries Handover
Command indicates that instruction UE switches specified cell.
13：Source eNB sends eNB Status Transfer message, this message eventually arrives at mesh through source MME, target MME
Mark eNB.This message is by the state notifying target eNB of the PDCP of the EPS Bearer of lossless switching.
13a~14:Source eNB can pass through Indirect Data Forwarding Tunnel and turn downlink data at this time
Issue target eNB.After source PGW and source SGW reaches source eNB, eNB discoveries in source need to turn data to target eNB downlink data
Hair, source eNB transmit data to source SGW first, and data are ultimately forwarded to by source SGW forwardings data to target SGW, target SGW
Target eNB.
15：After UE and target eNB establishes synchronization, sends Handover Confirm message and give target eNB, at this time
The downlink data forwarded from source eNB can be sent to UE by target eNB, and UE also begins to send upstream data, through target eNB
Source PGW is finally arrived to target SGW.
16：Target eNB sends Handover Notify message and gives target MME.
17：Target MME sends Forward Relocation Complete Notification message and gives source MME.
18：Source MME responds Forward Relocation Complete Acknowledge message and gives target MME, data
Forward finishes, and source MME and target MME start corresponding timer, after finishing switching, to delete corresponding resource.
19：Target MME sends Modify Bearer Request message to target SGW, by the sides target eNB user plane
IP address and TEID values notice target SGW.In this way switch after downlink data channel between target SGW to target eNB
It establishes.
20：Target SGW passes through the IP address and TEID values of the data surface of the target SGW distributed in the 4th step
Modify Bearer Request message gives source PGW, and the downlink data channel after switching in this way is between source PGW to target SGW
Part set up.Down going channel between source PGW to target eNB entire in this way, which is just established, to be finished.Downlink data can
From source PGW, UE is reached via target SGW and target eNB.
21：Source PGW update bearer context, distribute corresponding uplink dedicated bearer source PGW user plane IP address and
TEID values give target SGW by Modify Bearer Response message.
22：After target SGW receives the response of source PGW, data feedback channel is in target SGW to the part of source PGW it has been established that mesh
Mark SGW returns to Modify Bearer Response message and gives target MME.
23-24：After target MME receives the Modify Bearer Response message that target SGW is returned, under
Row NAS direct-sending messages carry the PDN connection new IP address of target PGW distribution to UE.
25-26：Vehicle-mounted UE is after receiving the downlink NAS direct-sending messages that target MME is sent, if the inside choosing carries
PDN connection IP address, the sides UE just update the routing between the IP address and LAN port address, and after routing update, UE passes through
Uplink NAS direct-sending messages feed back to target MME, and instruction UE side PDN connections IP address, which has been updated over, to be finished, after this step, the sides UE
By new PDN connection IP tunnels, network side is sent data to.
After the switching flow, following Fig. 6 of signaling planes of the vehicle-mounted UE of LTE after cross-line, across office switching shows, data surface
Flow graph is illustrated in fig. 7 shown below.
27：Target MME receive UE new PDN connections IP update finish instruction after, pass through Modify Bearer
Request message, the new routing in the sides notice target SGW UE, which has been updated over, to be finished.
28：Target SGW by Modify Bearer Request message, carry the sides target eNB data surface IP address and
TEID is indicated, and is notified target PGW, can be sent downlink data to UE.
29：Target PGW is by Modify Bearer Response message to target SGW with response.
30：Target SGW is by Modify Bearer Response message to target MME with response.
31：Target SGW gives source PGW by Delete Session Request message, carries the carrying information etc. of UE, accuses
Know source PGW, the session between source PGW to target SGW can be deleted.
32：After source PGW deletes local session context, pass through Delete Session Response response targets SGW.
So far after step, across EPC transfer of vehicle-mounted UE is just completed.
Wen Zhong, the term being related to are explained as follows：
3GPP：The 3rd Generation Partnership Project, third generation partner program；eNB：
Evolved Node B, evolved base station；EPC：Evolved Packet Core, Evolved Packet Core；LBI：Linked
EPS Bearer Id, default bearing ID；LTE：Long Term Evolution, 3GPP Long Term Evolutions；MME：
Mobility Management Entity, mobile management entity；PDN：Packet Data Network, Packet Data Network；
PGW：PDN Gateway, packet data network gateway；SGW：Serving Gateway, gateway；TAI： Tracking
Area Identity, trace regions mark；TEID：Tunnelling Endpoint Indentification, endpoint of a tunnel
Identifier；UE：User Equipment, terminal；QoS：Quality of Service, service quality；Cross-line：Across subway line
Switching, every subway line has oneself dedicated EPC network；Across office：Across the switching of Railway Bureau's circuit, each Railway Bureau has certainly
Oneself dedicated EPC networks；Operation system：The dedicated network of train signal is controlled on railway, subway.
Claims (6)
1. network handoff method when a kind of across the EPC switching of vehicle-mounted LTE UE, when car-mounted terminal cross-line, across office operation, by mesh
The EPC of mark road bureau completely takes over the behavior of terminal, under the premise of terminal and rail traffic operation system data connection are unbroken,
Realize the anchor point of data and signaling by the lossless transfer of the PGW under the PGW under the EPC of source to target EPC, it is characterised in that：Not
With EPC between switch when, for keep PDN connections continuity, cross-line switching hand-over in, vehicle-mounted UE still through
Home Routed modes keep the connection of signaling and data with source PGW, and session request is established to target SGW transmissions in target MME
When, target SGW also can establish session request to target PGW transmissions simultaneously, to establish the session between target SGW and target PGW
Channel, target SGW safeguard two sets of uplink session contexts of UE simultaneously.
2. network handoff method when across the EPC switching of vehicle-mounted LTE UE according to claim 1, it is characterised in that：Work as mesh
After the session channel of mark SGW and source PGW is got through completely, when target MME receives the Modify Bearer that target SGW is returned
After Response message, target MME is by downlink NAS direct-sending messages, the PDN connection new IP address of carrying target PGW distribution
To UE；The session channel of target SGW to source PGW is simultaneously closed off, the sides UE carry out the dynamic routing of LAN mouthfuls of IP and WAN mouthfuls of new IP, after
The signaling and data path for continuing vehicle-mounted UE directly walk target SGW and target PGW.
3. network handoff method when across the EPC switching of vehicle-mounted LTE UE according to claim 2, it is characterised in that：It is vehicle-mounted
UE is after receiving the downlink NAS direct-sending messages that target MME is sent, if the inside choosing carries PDN connection IP address, the sides UE are just
The routing between the IP address and LAN port address is updated, after routing update, UE is fed back by uplink NAS direct-sending messages
Target MME is given, instruction UE side PDN connections IP address, which has been updated over, to be finished, and after this step, the sides UE are logical by new PDN connections IP
Road sends data to network side.
4. network handoff method when across the EPC switching of vehicle-mounted LTE UE according to claim 1,2 or 3, it is characterised in that：
Including steps are as follows：
1）Target MME receive UE new PDN connections IP update finish instruction after, disappeared by Modify Bearer Request
Breath, the new routing in the sides notice target SGW UE, which has been updated over, to be finished；
2）Target SGW carries the data surface IP address and TEID of the sides target eNB by Modify Bearer Request message
Mark notifies target PGW, sends downlink data to UE；
3）Target PGW is by Modify Bearer Response message to target SGW with response；
4）Target SGW is by Modify Bearer Response message to target MME with response；
5）Target SGW gives source PGW by Delete Session Request message, carries the carrying information of UE, informs source
PGW deletes the session between source PGW to target SGW；
6）After source PGW deletes local session context, pass through Delete Session Response response targets SGW；
So far, across EPC transfer of vehicle-mounted UE is completed.
5. network handoff method when across the EPC switching of vehicle-mounted LTE UE according to claim 1,2 or 3, which is characterized in that
Steps are as follows for specific implementation：
1）ENodeB decisions in source carry out the switching based on S1, and source eNodeB sends Handover Required message to source MME,
The message includes type of message, switching type, target eNB ID, target TAI and needs the EPS carrying informations forwarded；
2）Source MME selectes suitable target MME, by S10 interfaces send Forward Relocation Request message to
Target MME, including the main contents include UE EPS PDN Connections, this cell carries all PDN connections letter of the UE
Breath includes：UE ID, UE safe contexts, UE network capabilities, the address of source SGW control planes and TEID, APN, PDN address,
Target eNB ID, target TAI, Linked EPS Bearer ID and Bearer with the associated all dedicated bearers of LBI
Contexts；In dedicated bearer Contexts, including the address of the source SGW in uplink user face and TEID and source PGW uplinks
The address of user plane and TEID；
3）Target MME selectes corresponding target SGW, sends Create Session Request message to target SGW, in message
Including the context each carried, including the address of upstream data face source PGW and TEID, the TEID of target MME control planes,
Handover instruction, target PGW address；
4）The carrying information that target SGW is sent according to target MME, be locally created acquiescence and dedicated bearer it is relevant up and down
Text sends Create Session Request message and arrives target PGW, carrying IMSI, APN in message, default bearing and special
ID the and Qos parameters of carrying, signing APN-AMBR, the address in the sides target SGW downlink user face and TEID and control plane
TEID；
Target PGW sends the carrying information in session establishment message according to target SGW, and all bearer context letters are being locally created
Breath establishes IP sessions with application server, and target PGW distributes new PDN IP address to UE, and it is accordingly special that target PGW carries out UE
The filter ID bindings of the filter ID of the carrying and IP of far-end server；
5）Target PGW sends Create Session Response message to target SGW, carries target PGW uplink users face
The new PDN IP address arguments of the TEID of IP address and TEID and control plane, dedicated bearer ID and Qos, UE, through this step
Afterwards, target PGW gives target SGW to send downlink user face data, do not obtain also at this time target eNB user plane IP address and
TEID, downlink data can not also be sent out, and target SGW can also give target PGW to send uplink user face data；
6）Target SGW returns to Create Session Response message and gives target MME, carries the sides target SGW uplink user face
The new PDN IP address of the TEID of IP address and TEID and control plane, UE；
7）Target MME sends Handover Request message and gives target eNB, and the information of each EPS carryings includes target SGW
Uplink user face IP address and TEID values, the Qos of EPS carryings；Target eNB can establish UE contexts after receiving above-mentioned message, packet
Include the information of carrying, safe context；
8）Target eNB replys Handover Request Ack message and gives target MME, wherein establishing result comprising EPS carryings
Information；The EPS carryings being successfully established for each, information include downlink data in the data surface IP address of the sides target eNB and
TEID values；
If X2 interface is not present between target eNB and source eNB, need if forwarding data by S1 interfaces, then target
ENB is also required to the address of data forwarding tunnel and TEID values being reported to target MME；
9）Target MME sends Create Indirect Data Forwarding Tunnel Request message and gives target SGW,
The IP address of the sides downlink data forwarding channel target eNB and TEID values are notified into target SGW, forwarding channel is from target SGW to mesh
It is had built up between mark eNB；
Target SGW replys Create Indirect Data Forwarding Tunnel Response message, described information packet
Contained forward Tunnel the sides target SGW IP address and TEID values；
10）Target MME sends Forward Relocation Response message and gives source MME, by EPS Bearers Setup
Result notifies source MME；
In the case where there is forward Tunnel, IP address and TEID value of the forward channel in the sides target SGW also can be in this message
Notice source MME；
11）Create Indirect DataForwarding Tunnel are sent in the case that having forward tunnel, source MME
Request message gives source SGW, carries IP address and TEID value of the forwarding channel in the sides target SGW and notifies source SGW, forwarding channel
It is had built up from source SGW to target SGW；
11a）Source SGW replys Create Indirect DataForwarding Response, by forwarding channel in the source sides SGW
IP address and TEID values notify source MME；
Source MME will be transmitted to this information source eNB；
12）Source MME sends Handover Command message and gives source eNB, all carryings that the needs that target eNB is distributed are forwarded
Address and TEID notify to give source eNB；
12a）Source eNB sends RRCConnectionReconfiguration message to UE, carries Handover Command and refers to
Show, the specified cell of instruction UE switchings；
13）Source eNB sends eNB Status Transfer message, this message eventually arrives at target through source MME, target MME
eNB；
This message is by the state notifying target eNB of the PDCP of the EPS Bearer of lossless switching；
13a~14）Downlink data can be transmitted to mesh by source eNB by Indirect Data Forwarding Tunnel at this time
Mark eNB；
Downlink data is after source PGW and source SGW reaches source eNB, and eNB discoveries in source need to forward data to target eNB, source eNB
Source SGW is transmitted data to first, and data are ultimately forwarded to target eNB by source SGW forwardings data to target SGW, target SGW；
15）After UE and target eNB establishes synchronization, sends Handover Confirm message and give target eNB, at this time target
The downlink data forwarded from source eNB can be sent to UE by eNB, and UE also begins to send upstream data, through target eNB to mesh
Mark SGW finally arrives source PGW；
16）Target eNB sends Handover Notify message and gives target MME；
17）Target MME sends Forward Relocation Complete Notification message and gives source MME；
18）Source MME responds Forward Relocation Complete Acknowledge message and gives target MME, data forwarding
It finishes, source MME and target MME start corresponding timer, after finishing switching, to delete corresponding resource；
19）Target MME sends Modify Bearer Request message to target SGW, by the IP of the sides target eNB user plane
Location and TEID values notice target SGW；
20）The IP address and TEID values of the data surface of the target SGW distributed in the 4th step are passed through Modify by target SGW
Bearer Request message gives source PGW, part of the downlink data channel between source PGW to target SGW after switching in this way
It sets up；
21）Source PGW update bearer context, distribute corresponding uplink dedicated bearer source PGW user plane IP address and TEID
Value, target SGW is given by Modify Bearer Response message；
22）After target SGW receives the response of source PGW, data feedback channel is in target SGW to the part of source PGW it has been established that target
SGW returns to Modify Bearer Response message and gives target MME.
6. network handoff method when across the EPC switching of vehicle-mounted LTE UE according to claim 5, which is characterized in that including
Steps are as follows：
23-24）After target MME receives the Modify Bearer Response message that target SGW is returned, pass through downlink
NAS direct-sending messages carry the PDN connection new IP address of target PGW distribution to UE；
25-26）Vehicle-mounted UE is after receiving the downlink NAS direct-sending messages that target MME is sent, if the inside choosing carries PDN companies
IP address is connect, the sides UE just update the routing between the IP address and LAN port address, and after routing update, UE passes through uplink
NAS direct-sending messages feed back to target MME, and instruction UE side PDN connections IP address, which has been updated over, to be finished, and after this step, the sides UE pass through
New PDN connection IP tunnels, send data to network side；
27）Target MME receive UE new PDN connections IP update finish instruction after, disappeared by Modify Bearer Request
Breath, the new routing in the sides notice target SGW UE, which has been updated over, to be finished；
28）Target SGW carries the data surface IP address and TEID of the sides target eNB by Modify Bearer Request message
Mark notifies target PGW, sends downlink data to UE；
29）Target PGW is by Modify Bearer Response message to target SGW with response；
30）Target SGW is by Modify Bearer Response message to target MME with response；
31）Target SGW gives source PGW by Delete Session Request message, carries the carrying information of UE, informs source
PGW can delete the session between source PGW to target SGW；
32）After source PGW deletes local session context, pass through Delete Session Response response targets SGW；So far,
Complete across EPC transfer of vehicle-mounted UE.
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| CN106332204A (en) * | 2016-08-19 | 2017-01-11 | 广东工业大学 | PGW switching method and system |
| WO2018058529A1 (en) | 2016-09-30 | 2018-04-05 | 华为技术有限公司 | Method and device for establishing bearer |
| US10080171B2 (en) * | 2016-12-14 | 2018-09-18 | T-Mobile Usa, Inc. | Continuous communication for prioritized user device applications |
| JP2019096953A (en) * | 2017-11-20 | 2019-06-20 | シャープ株式会社 | User equipment |
| CN111065135B (en) * | 2019-11-29 | 2021-11-12 | 北京长焜科技有限公司 | Method for switching 3G gateway to 4G gateway |
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