CN101982997B - Method for shortening UE attachment time when SCTP link flashes in TD-LTE system - Google Patents
Method for shortening UE attachment time when SCTP link flashes in TD-LTE system Download PDFInfo
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Abstract
The invention provides a method for shortening UE attachment time when an SCTP link flashes in a TD-LTE system, comprising the following steps: A. an evolved base station (eNB) judges the state of the SCTP link after the radio resource control (RRC) link of UE is completed, if the SCTP link flashes, the step B is implemented, or the step C is implemented; B. the eNB starts a timer; if the SCTP link is restored and the timer is not overtime after the eNB establishes S1 link with a mobility management entity (MME), the step C is implemented, and if the SCTP link is restored and the timer is overtime after the eNB establishes S1 link with MME or the SCTP link is not restored and the timer is overtime, the UE attachment fails; and C. the eNB continues implementing attachment. The method can shorten the UE attachment time when the SCTP link flashes.
Description
Technical field
The present invention relates to mobile communication technology, (time division-longterm evolution shortens UE when TD-LTE) sudden strain of a muscle of system flow control transmission (SCTP) link is disconnected and adheres to time method particularly to relate to the TD Long Term Evolution.
Background technology
The TD-LTE system comprises Universal Terrestrial Radio Access Network network evolution (E-UTRAN) and packet domain core network evolution (EPC), and referring to Fig. 1, Fig. 1 is that TD-LTE system network architecture schematic diagram: E-UTRAN is made up of evolved base station (eNB); ENB can communicate by S1 interface and core net; Also can realize communication between the eNB by X2 interface.
When subscriber equipment (UE) was started shooting, the user need be registered to network, namely begins attaching process, comprised that Radio Resource control (RRC) connects, authentication, and initial context is set up, the UE capability query, safe mode activates and the RRC reprovision.Referring to Fig. 2, Fig. 2 is the flow chart of prior art UE attaching process, and its concrete flow process comprises the steps:
Step 201, UE send the RRC connection to eNB and set up request message, trigger attaching process;
Step 202, eNB receive RRC that UE sends connect set up request message after, application eNB resource sends RRC to UE and connects and set up command messages;
Step 203, UE receive RRC that eNB sends connect set up command messages after, send the RRC connection setup complete message to eNB, RRC connects to set up and finishes;
After step 204, eNB receive the RRC connection setup complete message that UE sends, make up initial UE message according to the RRC connection setup complete message, and send out initial UE message to Mobility Management Entity (MME);
After step 205, MME receive initial UE message, send descending Non-Access Stratum (NAS) message by eNB to UE: authentication request message;
Step 206, UE receive the descending NAS message of MME: after the authentication request message, send up NAS message to MME: authentication response message;
Step 207, MME receive the up NAS message of UE: after the authentication response message, carry out authentication, authentication sends initial context by the back to eNB and sets up request message;
After step 208, eNB receive that initial context that MME sends is set up request message, send the UE ability to UE and obtain request message;
After step 209, UE receive that the UE ability is obtained request message, send the UE capability information message to eNB;
After step 210, eNB receive the UE capability information message that UE sends, send UE ability Indication message to MME, the UE ability is reported MME;
Step 211, eNB carry out safe procedures after the UE ability is reported MME, send Security Mode Command message to UE;
After step 212, UE receive the Security Mode Command message that eNB sends, carry out security configuration and send safe mode to eNB finishing message;
After step 213, eNB receive that safe mode that UE sends is finished message, send RRC to UE and connect reallocation message, set up Signaling Radio Bearer (SRB2) and Data Radio Bearer (DRB);
After step 214, UE receive that RRC that eNB sends connects reallocation message, send RRC to eNB and connect reprovision and finish message;
Step 215, eNB send initial context to MME and set up response message after receiving that RRC connection reprovision is finished message;
Step 216, UE send up NAS message to MME: adhere to and finish message, this attaching process finishes.
According to existing 36413 technical specifications, in the UE attaching process, when adhering to for the first time, UE starts timer T3410 after RRC connection foundation is finished, if T3410 is the overtime T3411 that restarts, if UE receives Authentication Response, termination timing device then, if because network failure, for example network congestion makes the SCTP link that the disconnected timer expiry that causes take place to dodge, the S1 interface can be deleted all private resources, and this adheres to failure.According to 24301 technical specifications, UE can initiate a up NAS message to eNB: uplink information transmission (ULInformationTransfer), and this up NAS message is exactly Attach Request message; If this adheres to failure, UE can retransmit Attach Request message and adhere to again, retransmits at most 4 times.UE can start timer T3410 after adhering to the request initiation at every turn, and the time is 15 seconds, if T3410 is overtime, then starts timer T3411, and the time is 10 seconds, if T3411 is overtime, initiates to retransmit again.That is to say, twice retransmit interval 25 seconds, consuming time longer, therefore, when the SCTP link dodges when disconnected, it is consuming time longer that UE adheres to the time.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of TD-LTE SCTP of system link to dodge to shorten UE when disconnected and adhere to time method, this method can shorten the SCTP link and dodge that UE adheres to the time when disconnected.
In order to achieve the above object, the invention provides a kind of TD-LTE SCTP of system link and dodge and shorten UE when disconnected and adhere to time method, this method comprises step:
A, evolved base station eNB judge the SCTP Link State after the radio resource control RRC connection of UE is finished, disconnected if the SCTP link dodges, execution in step B, otherwise, execution in step C;
B, eNB start timer;
If SCTP link-recovery and eNB foundation are connected the back timer with the S1 of Mobility Management Entity MME not overtime as yet, execution in step C then, if SCTP link-recovery and eNB foundation are connected the back timer with the S1 of MME overtime, or the SCTP link not recover timer overtime, then this UE adheres to failure;
C, eNB continue to carry out attaching process.
The connection of RRC described in the steps A is finished and be may further comprise the steps:
A0, UE send the RRC connection and set up request message to eNB, trigger the UE attaching process;
After request message is set up in the RRC connection that A1, eNB receive, send the RRC connection to UE and set up command messages;
A2, UE send the RRC connection setup complete message to eNB after receiving that command messages is set up in the RRC connection, finish RRC and connect.
Step C comprises: eNB sends initial UE message to MME, continues to carry out authentication, initial context foundation, UE capability query, complete mode activation and RRC reprovision flow process.
The described judgement of steps A SCTP link dodges has no progeny, and further comprised before execution in step B: eNB preserves the NAS message of carrying in the described RRC connection setup complete message that receives;
ENB transmission initial UE message further comprised before MME among the step C: eNB utilizes the NAS message construction initial UE message of preserving.
The time span of the described timer of step B was less than 25 seconds;
Described SCTP link-recovery and eNB foundation are connected the back timer with the S1 of MME not overtime as yet, and taking a step forward at execution in step C comprises: the deletion timer.
The described SCTP link-recovery of step B and eNB foundation are connected the back timer with the S1 of MME overtime, and this UE further comprises after adhering to failure, if eNB receives the Attach Request message that UE sends, then goes to step C and carries out.
It is overtime that the described SCTP link of step B does not recover timer, and this UE further comprises after adhering to failure: if the SCTP link-recovery, then eNB rebulids with the S1 of MME and is connected;
If eNB receives the Attach Request message that UE sends, then under SCTP link-recovery and eNB set up situation with the S1 successful connection of MME, go to step C and carry out; At the SCTP link-recovery but eNB setting up under the situation about being connected with the S1 of MME, start timer, set up S1 successful connection with MME up to eNB; , return step B and carry out still under the unrecovered situation at the SCTP link.
Described eNB comprises further after receiving the Attach Request message that UE sends that eNB preserves the NAS message of carrying in the Attach Request message;
After described eNB receives the Attach Request message that UE sends, under SCTP link-recovery and eNB set up situation with the S1 successful connection of MME, during execution in step C, eNB transmission initial UE message further comprised before MME in step C: eNB utilizes the NAS message construction initial UE message of preserving.
Described eNB is setting up under the situation about being connected with the S1 of MME at SCTP link-recovery and eNB after receiving the Attach Request message that UE sends, start timer after, if eNB sets up the S1 successful connection with MME, then delete timer, forward step C to and carry out.
Described eNB sets up to be connected with the S1 of MME and may further comprise the steps:
B0, eNB send the S1 connection and set up request message to MME;
After B1, MME receive that request message is set up in the S1 connection, send S1 connection establishment response message to eNB.
As shown from the above technical solution, the present invention is by after finishing in the RRC connection, eNB is, and the SCTP link is judged, when the sudden strain of a muscle of SCTP link is disconnected, start timer TS1, wait for link-recovery, if in the timer TS1 time, link-recovery, then eNB rebulids and is connected with the S1 of MME and sends initial UE message to MME, continue to carry out the subsequent attachment process, and not need receive that the whole overtime backs of UE side timer T3410 and T3411 retransmit adhere to request after continue attaching process again, therefore having shortened UE adheres to the time.
Description of drawings
Fig. 1 is TD-LTE system network architecture schematic diagram;
Fig. 2 is the flow chart of prior art UE attaching process;
Fig. 3 is the process chart of eNB in the UE attaching process of the present invention;
Fig. 4 is the UE of the present invention process chart that the SCTP link breaks down and recovers at the appointed time when adhering to;
Fig. 5 is the process chart that UE of the present invention does not recover after the SCTP link breaks down when adhering at the appointed time.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, once with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Basic thought of the present invention is: eNB judges that the SCTP link takes place to dodge when breaking, start timer TS1, if SCTP link-recovery in the timer TS1 time, then eNB does not need to wait for that UE resends Attach Request message, rebulid and MME between link after just can continue attaching process, thereby shortened the SCTP link and dodged that UE adheres to the time when disconnected.
Referring to Fig. 3, Fig. 3 is the process chart of eNB in the UE attaching process of the present invention, and it may further comprise the steps:
In this step, after the RRC connection was set up and finished, eNB preserved the NAS message of carrying in the RRC connection setup complete message, was used for eNB and made up initial UE message before to MME transmission initial UE message.
It is disconnected that step 302, eNB judge whether the SCTP link dodges, and breaks if dodge, and then execution in step 303, otherwise, execution in step 315.
The transport network layer of eNB sends at regular intervals to MME and sends heartbeat (Heartbeat) request, if continuous several request does not all meet with a response, it is disconnected just to think that the SCTP link dodges, if meet with a response, think that then the SCTP link is normal, this is same as the prior art, repeats no more.
In this step, the time span of timer TS1 is less than the time span sum of T3410 and two timers of T3411, also namely less than 25 seconds.
When recovery was had no progeny in SCTP link generation sudden strain of a muscle, eNB can access MME to the response of the heartbeat request of its transmission, thinks that then the SCTP link is normal, therefore also just knows link-recovery.
If TS1 is in the time, SCTP link-recovery and eNB rebulid with the S1 of MME and are connected, and then execution in step 304; If TS1 is in the time, SCTP link-recovery and eNB are setting up with the S1 of MME and are being connected, and then execution in step 305; If TS1 is in the time, the SCTP link does not recover, and then execution in step 306.
In this step, if eNB receive UE adhere to when request the SCTP link-recovery and eNB rebuild S1 link with MME, then go to step 309; If eNB receive UE adhere to when request the SCTP link-recovery and eNB setting up with the S1 of MME and be connected, then go to step 310; If eNB receives the SCTP link recovery as yet when asking of adhering to of UE, then go to step 311;
SCTP occurs under the situation of link failure when adhering to regard to UE respectively below, and the present invention is further described according to situation that whether link recovers at the appointed time.
Referring to Fig. 4, Fig. 4 is the UE of the present invention process chart that the SCTP link breaks down and recovers at the appointed time when adhering to, and idiographic flow may further comprise the steps:
Step 401, UE send the RRC connection to eNB and set up request message.
After step 402, eNB receive RRC connection request message, send the RRC connection to UE and set up command messages.
Step 403, UE send the RRC connection setup complete message to eNB after receiving that command messages is set up in the RRC connection.
After step 404, eNB receive the RRC connection setup complete message, preserve the NAS message of carrying in the RRC connection setup complete message, check the SCTP Link State, determine link failure.
Step 405, eNB start timer TS1, enter timer and wait for, wait for link-recovery.
Step 406, SCTP link-recovery.
Behind step 407, the SCTP link-recovery, eNB sends S1 to MME and sets up request message, is connected to rebulid with the S1 of MME.
Step 408, MME receive that S1 sets up request message, send S1 to eNB and set up response message, rebulid link and finish.
Step 409, eNB judge that definite timer TS1 is not overtime, deletion timer TS1.
Here, step 407,408 and the execution sequence of step 409 can be not in order, for example, execution sequence can also be 407,409,408, or 409,407,408, in both cases, step 409 is judged timer expiry, no longer carry out follow-up step 410-422, but adhere to request to eNB in UE side timer T3411 overtime back transmission, eNB receives to adhere to and asks back judgement link to recover, the NAS message of carrying in the request is adhered in utilization, make up initial UE message, and send initial UE message to MME, continue execution in step 411-422 this moment again, finishes attaching process.
Step 410, eNB connect the NAS message of preserving after foundation is finished with RRC and are filled up to the new initial UE message of structure in the initial UE message, and send to MME.
After step 411, MME receive initial UE message, send descending NAS message by eNB to UE: authentication request message.
Step 412, UE receive descending NAS message: after the authentication request message, send up NAS message to MME: authentication response message.
Step 413, MME receive up NAS message: after the authentication response message, send initial context to eNB and set up request message.
After step 414, eNB receive that initial context is set up request message, send the UE ability to UE and obtain request message.
After step 415, UE receive that the UE ability is obtained request message, send the UE capability information message to eNB.
After step 416, eNB receive the UE capability information message, send UE ability Indication message to MME, the UE ability is reported MME.
Step 417, eNB carry out safe procedures after the UE ability is reported MME, send Security Mode Command message to UE.
After step 418, UE receive Security Mode Command message, carry out security configuration and send safe mode to eNB finishing message.
After step 419, eNB receive that safe mode is finished message, send RRC to UE and connect reallocation message, set up SRB2 and DRB.
After step 420, UE receive that RRC connects reallocation message, send RRC connection reprovision to eNB and finish message.
Step 421, eNB send initial context to MME and set up response message after receiving that RRC connection reprovision is finished message.
Step 422, UE send up NAS message to MME: adhere to and finish message, this attaching process finishes.
Need to prove that the step 401 among Fig. 4,402,403,410-422 correspond respectively to step 201,202,203, the 204-216 among Fig. 2, that is to say that step 401,402,403,410-422 are identical with the processing of prior art.
Referring to Fig. 5, Fig. 5 is the process chart that UE of the present invention does not recover after the SCTP link breaks down when adhering at the appointed time, and wherein, step 501-505,512-524 are identical with step 401-405,410-422 among Fig. 4 respectively, do not repeat them here.Below the step 406-411 behind the eNB startup timer TS1 is described.
Step 506, SCTP link do not recover, and timer TS1 is overtime.
Step 507, SCTP link-recovery.
Behind step 508, the SCTP link-recovery, eNB sends S1 to MME and sets up request message, with rebulid and MME between link.
Step 509, MME receive that S1 sets up request message, send S1 to eNB and set up response message, rebulid link and finish.
T3411 is overtime for step 510, UE side timer, sends Attach Request message to eNB again.
Step 511, eNB check whether the SCTP link recovers, if recovery and S1 link are set up, utilizes the NAS message construction initial UE message of carrying in the Attach Request message, execution in step 512, otherwise eNB starts timer TS1 again, enters timer and waits for.
Need to prove that step 507,508,509 execution and step 510,511 execution are decided by concrete condition, specifically, are divided into following three kinds of situations:
1, during the SCTP link-recovery, UE side timer T3411 is not overtime as yet.At this moment, elder generation's order execution in step 507,508,509, rebuliding eNB behind the SCTP link-recovery is connected with S1 between the MME, execution in step 510,511 again, also namely when UE side timer T3411 is overtime, UE resends Attach Request message to eNB, after eNB receives Attach Request message, check whether the SCTP link recovers, this moment, the SCTP link recovered, thus the NAS message construction initial UE message of carrying in the Attach Request message of eNB according to the UE transmission, and to MME transmission initial UE message, continuing follow-up attachment flow, also is step 512-524.
2, before S1 link connection foundation was finished behind the SCTP link-recovery, T3411 was overtime for UE side timer.Order execution in step 510,511 also when at this moment, eNB order execution in step 507,508,509 rebulids S1 link between eNB and the MME.If step 509 is finished prior to step 511, then after execution of step 511, also be that eNB judges whether link dodges when disconnected the S1 link and set up, and at this moment, continues to carry out 512-524; Otherwise eNB starts timer TS1, after step 509 is finished, also be that the S1 link establishment was finished after eNB started timer, at this moment, deletion timer TS1, continue execution in step 512-524, here, startup timer TS1, S1 link establishment are finished, are deleted timer TS1 and do not draw in the drawings.
3, UE side timer T3411 is overtime, and the SCTP link does not recover yet.At this moment, execution in step 507,508,509 no longer, but direct execution in step 510,511, also namely when UE side timer T3411 is overtime, UE resends Attach Request message to eNB, after eNB receives Attach Request message, checks whether the SCTP link recovers, this moment, the SCTP link did not recover as yet, the eNB side starts timer TS1 again, enters timer and waits for, in this process, because not execution in step 507-509, so with dashed lines indicates.After eNB started timer TS1 again, if the SCTP link recovered in the timer TS1 time, then the handling process behind the SCTP link-recovery was identical among its follow-up processing flow and Fig. 4, repeats no more; If the SCTP link recovered in the timer TS1 time, then the follow-up processing flow that the SCTP link does not recover in the timer TS1 time among its follow-up processing flow and Fig. 5 is identical, repeats no more; If UE stresses to pass 4 times and adheres to the still not recovery of request back SCTP link, then this UE attaching process failure, in this case, step 512-524 never carries out, so with dashed lines indicates.
In sum, the present invention dodges at eNB judgement SCTP link and has no progeny by utilizing timer function, according to the recovery time of SCTP link and the overtime situation of timer TS1, control UE attaching process, do not need to wait for that UE stresses new the transmission and adheres to request and just can continue to carry out follow-up attachment flow under the situation that makes the SCTP link recover at the appointed time, dodge that UE adheres to the time when breaking thereby shortened the SCTP link.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. shorten user equipment (UE) when TD Long Term Evolution TD-LTE system flow control transmission SCTP link sudden strain of a muscle is disconnected and adhere to time method, it is characterized in that this method may further comprise the steps:
A, evolved base station eNB judge the SCTP Link State after the radio resource control RRC connection of UE is finished, disconnected if the SCTP link dodges, execution in step B, otherwise, execution in step C;
B, eNB start timer;
If SCTP link-recovery and eNB foundation are connected the back timer with the S1 of Mobility Management Entity MME not overtime as yet, execution in step C then, if SCTP link-recovery and eNB foundation are connected the back timer with the S1 of MME overtime, or the SCTP link not recover timer overtime, then this UE adheres to failure;
C, eNB continue the execution attaching process, comprising: eNB sends initial UE message to MME, continues to carry out authentication, initial context foundation, UE capability query, complete mode activation and RRC reprovision flow process.
2. shorten UE when the sudden strain of a muscle of the SCTP of TD-LTE system link is disconnected according to claim 1 and adhere to time method, it is characterized in that, the connection of RRC described in the steps A is finished and be may further comprise the steps:
A0, UE send the RRC connection and set up request message to eNB, trigger the UE attaching process;
After request message is set up in the RRC connection that A1, eNB receive, send the RRC connection to UE and set up command messages;
A2, UE send the RRC connection setup complete message to eNB after receiving that command messages is set up in the RRC connection, finish RRC and connect.
3. dodge as the SCTP of TD-LTE system link as described in the claim 2 and shorten UE when disconnected and adhere to time method, it is characterized in that, the described judgement of steps A SCTP link dodges has no progeny, and further comprised before execution in step B: eNB preserves the NAS message of carrying in the described RRC connection setup complete message that receives;
ENB transmission initial UE message further comprised before MME among the step C: eNB utilizes the NAS message construction initial UE message of preserving.
4. dodge as the SCTP of TD-LTE system link as described in the claim 3 and shorten UE when disconnected and adhere to time method, it is characterized in that the time span of the described timer of step B was less than 25 seconds;
Described SCTP link-recovery and eNB foundation are connected the back timer with the S1 of MME not overtime as yet, and taking a step forward at execution in step C comprises: the deletion timer.
5. dodge as the SCTP of TD-LTE system link as described in the claim 4 and shorten UE when disconnected and adhere to time method, it is characterized in that, the described SCTP link-recovery of step B and eNB foundation are connected the back timer with the S1 of MME overtime, this UE further comprises after adhering to failure, if eNB receives the Attach Request message that UE sends, then go to step C and carry out.
6. dodge as the SCTP of TD-LTE system link as described in the claim 5 and shorten UE when disconnected and adhere to time method, it is characterized in that, it is overtime that the described SCTP link of step B does not recover timer, this UE further comprises after adhering to failure: if the SCTP link-recovery, then eNB rebulids with the S1 of MME and is connected;
If eNB receives the Attach Request message that UE sends, then under SCTP link-recovery and eNB set up situation with the S1 successful connection of MME, go to step C and carry out; At the SCTP link-recovery but eNB setting up under the situation about being connected with the S1 of MME, start timer, set up S1 successful connection with MME up to eNB; , return step B and carry out still under the unrecovered situation at the SCTP link.
7. dodge as the SCTP of TD-LTE system link as described in the claim 6 and shorten UE when disconnected and adhere to time method, it is characterized in that, described eNB comprises that further eNB preserves the NAS message of carrying in the Attach Request message after receiving the Attach Request message that UE sends;
After described eNB receives the Attach Request message that UE sends, under SCTP link-recovery and eNB set up situation with the S1 successful connection of MME, during execution in step C, eNB transmission initial UE message further comprised before MME in step C: eNB utilizes the NAS message construction initial UE message of preserving.
8. dodge as the SCTP of TD-LTE system link as described in the claim 7 and shorten UE when disconnected and adhere to time method, it is characterized in that, after described eNB receives the Attach Request message that UE sends, setting up under the situation about being connected with the S1 of MME at SCTP link-recovery and eNB, after starting timer, if eNB sets up the S1 successful connection with MME, then delete timer, forward step C to and carry out.
9. dodge as claim 1,4,5,6, the 7 or 8 described TD-LTE SCTP of system links and shorten UE when disconnected and adhere to time method, it is characterized in that, described eNB sets up to be connected with the S1 of MME and may further comprise the steps:
B0, eNB send the S1 connection and set up request message to MME;
After B1, MME receive that request message is set up in the S1 connection, send S1 connection establishment response message to eNB.
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| CN102858024A (en) * | 2011-07-01 | 2013-01-02 | 中兴通讯股份有限公司 | Processing method and system of UE (User Equipment) in SCTP (Stream Control Transmission Protocol) coupling flashing process |
| US9992240B2 (en) | 2015-02-13 | 2018-06-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Preserving S1-AP UE contexts on SCTP failover |
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| CN101087244A (en) * | 2006-06-07 | 2007-12-12 | 华为技术有限公司 | An implementation method for congestion control in stream control transmission |
| CN101192907A (en) * | 2006-11-29 | 2008-06-04 | 中兴通讯股份有限公司 | Method for restraining IP link jitter at user adaptation layer of signaling network layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101087244A (en) * | 2006-06-07 | 2007-12-12 | 华为技术有限公司 | An implementation method for congestion control in stream control transmission |
| CN101192907A (en) * | 2006-11-29 | 2008-06-04 | 中兴通讯股份有限公司 | Method for restraining IP link jitter at user adaptation layer of signaling network layer |
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