CN102348245A - Processing method and device of S1 handover failure in LTE (Long Term Evolution) system - Google Patents
Processing method and device of S1 handover failure in LTE (Long Term Evolution) system Download PDFInfo
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Abstract
The embodiment of the invention provides a processing method of an S1 handover failure in an LTE (Long Term Evolution) system. The processing method comprises the following steps of: after triggering the S1 handover failure, judging whether the handover failure is in a stage of an S1 handover process; triggering the S1 handover process by a target cell if the handover failure is in a preparatory stage of the S1 handover flow; triggering an RRC (Radio Resource Control) connection reconstruction flow if the handover failure is in an execution stage of the S1 handover flow; and deleting a wireless resource which is occupied by UE (User Equipment) if the handover failure is in a finished stage of the S1 handover flow. The embodiment of the invention further provides a processing system of the S1 handover failure in the LTE system. According to the embodiment of the invention, different processes are carried out on the S1 handover failure in different stages, so that the probability to realize S1 handover successfully is improved, the resource occupation of the LTE system is reduced, and the LTE system property is further improved.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the processing method and the related device of S1 handoff failure in a kind of LTE system.
Background technology
LTE (Long Term Evolution; Long Term Evolution) network using flat network topology structure; The LTE system mainly comprises E-UTRAN (Evolved Universal Terrestrial Radio Access Network, the universal mobile communications wireless access network of evolution) and EPC (Evolved Packet Core, the packet switched core network of evolution) two parts; Wherein: E-UTRAN is by a plurality of eNB (Evolved NodeB; Evolution base station) constitute, each eNB comprises a plurality of sub-districts, interconnects through X2 interface between eNB and the eNB; EPC is made up of S-GW (Serving Gateway, gateway) and MME (Mobility Management Entity, Mobility Management Entity), and it realizes mutual through S1 interface and each eNB.Above-mentioned organizational structure is referring to accompanying drawing 1.Generally, the LTE system uses X2 interface to carry out the switching between the eNB, and this mode can be saved the S1 interface resource, reduces the influence to EPC.But in some cases, X2 interface is not supported hand off signaling, and the switching between the eNB must adopt the S1 interface to realize.
The related protocol that S1 switches in the 3GPP LTE system is described signaling process and the implementation procedure that S1 switches in detail, sees also accompanying drawing 2.But the signaling process that above-mentioned agreement provides only is that S1 switches and to be in the handoff procedure under the normal condition, do not introduce the S1 handoff failure after the LTE system how to handle to the S1 handoff procedure.Therefore, the processing mode behind the S1 handoff failure becomes the important topic of research.Processing method behind the S1 handoff failure that prior art provides is: source eNB receives UE (User Equipment; Subscriber equipment) behind the measurement report; When judgement need be carried out the S1 switching; Obtain RRC (Radio Resource Control, Radio Resource control connection) by source eNB and prepare the collection cell list, and this RRC preparation collection cell list is sent to UE; When handoff failure, prepare the best sub-district that can initiate the RRC connection re-establishment of search in the collection cell list by UE at Target cell, cell-of-origin and RRC, and initiate RRC connection reconstruction flow process to this sub-district that searches.According to the requirement of this technical scheme, as long as the S1 handoff failure all need be initiated RRC connection reconstruction flow process.Yet; The processing mode of this clean cut is imappropriate: such as; If the S1 handoff failure appeared at source eNB before UC sends RRC connection reallocation message; Because still in the cell range of source eNB, when up-downgoing data to be transmitted also were not forwarded to the sub-district of target eNB or prepare the sub-district in the collection tabulation, target eNB possibly not reserved related resource to UE to UE; At this moment initiate RRC connection reconstruction flow process to Target cell and cause handoff failure probably once more, initiate RRC connection reconstruction process to the sub-district of source eNB and can not realize that S1 switches.This shows, by source eNB after target eNB is carried out the S1 handoff failure, adopt the processing method of prior art, with reducing the probability of realizing that successfully S1 switches, the resource occupation of increase LTE system is unfavorable for the perfect performance of LTE system.
Summary of the invention
Because the problem that the processing method behind the S1 handoff failure of prior art exists; The goal of the invention of the embodiment of the invention is to provide processing method and the related device behind the S1 handoff failure in a kind of new LTE system; Different through to the S1 handoff failure stage of living in of this method and related device; Adopt differential processing mode to improve the probability of realizing that successfully S1 switches, improve the performance of LTE system.
The processing method of S1 handoff failure comprises in the LTE provided by the invention system:
The S1 handoff failure judges that said handoff failure is in the stage of S1 handoff procedure after triggering, if be in the preparatory stage of S1 handoff procedure, then initiates the S1 switching flow to Target cell; If be in the execution phase of S1 handoff procedure, then initiate RRC connection re-establishment flow process; If be in the completion stage of S1 handoff procedure, then delete the source eNB resource that UE takies.
Preferably, said S1 handoff failure triggers and comprises:
UE monitors signal difference after source eNB sends measurement and report message, in first Preset Time, does not receive and triggers the S1 handoff failure when RRC connects reallocation message; Or,
Source eNB does not receive in second Preset Time when switching command message is prepared failed message with switching after MME transmission switching requires message, triggering S1 handoff failure; Or,
Source eNB receives in second Preset Time and switches when preparing failed message after MME transmission switching requires message, triggers the S1 handoff failure; Or,
UE receives when RRC connection reallocation message is configured success, triggers the S1 handoff failure; Or,
Source eNB when in the 3rd Preset Time, not receiving UE context release command message, triggers the S1 handoff failure after MME sends base station state transitions message; Or,
UE does not receive uplink assignment/when message is adjusted in timing, triggering S1 handoff failure in the 4th Preset Time after target eNB is sent synchronization message.
Further preferably; When UE monitors signal difference after source eNB sends measurement and report message; In first Preset Time, do not receive RRC to connect reallocation message and when triggering the S1 handoff failure; Judge whether source eNB sends RRC and connect reallocation message, if then the S1 handoff failure is in the execution phase of S1 handoff procedure; If then the S1 handoff failure is in the preparatory stage of S1 handoff procedure not; Or,
When source eNB to MME send to switch require message after, do not receive that in second Preset Time switching command message prepares failed message and when triggering the S1 handoff failure, the S1 handoff failure is in the preparatory stage of S1 handoff procedure with switching; Or,
When source eNB to MME send to switch require message after, in second Preset Time, receive to switch and prepare failed message and when triggering handoff failure, the S1 handoff failure is in the S1 handoff procedure preparatory stage; Or,
When UE receives that RRC connects that reallocation message is configured success and when triggering the S1 handoff failure, the S1 handoff failure is in the execution phase of S1 handoff procedure, initiates RRC connection re-establishment flow process by UE to target eNB; Or,
When source eNB after MME sends base station state transitions message; In the 3rd Preset Time, do not receive UE context release command message and when triggering the S1 handoff failure; The S1 handoff failure is in the completion stage of S1 handoff procedure, sends the UE context by UE to source eNB and discharges request message so that delete the source eNB resource that UE takies; Or,
When UE after target eNB is sent synchronization message; In the 4th Preset Time, do not receive uplink assignment/timing to adjust message and when triggering the S1 handoff failure; The S1 handoff failure is in the execution phase of S1 handoff procedure, initiates RRC connection re-establishment flow process by UE to target eNB.
Further preferably; When source eNB to MME send to switch require message after; In second Preset Time, do not receive when switching command message triggers the S1 handoff failure with switching the preparation failed message; The S1 handoff failure is in the preparatory stage of S1 handoff procedure, then initiates the S1 switching flow to the former Target cell of former target eNB; Or,
When source eNB to MME send to switch require message after, in second Preset Time, receive to switch and prepare failed message and when triggering handoff failure, the S1 handoff failure is in the S1 handoff procedure preparatory stage, then initiates the S1 switching flow to Target cell and comprises:
Judge to switch to prepare whether failed message carries the Target cell non-availability or Target cell does not allow to switch or the Target cell ID the unknown or the unavailable information content of Radio Resource, if then initiate the S1 switching flow to alternative target cells; If, then do not initiate the S1 switching flow to the former Target cell of former target eNB.
Further preferably; Said method also comprises: when source eNB to MME send to switch require message after; In second Preset Time, do not receive when switching command message triggers the S1 handoff failure with switching the preparation failed message; The S1 handoff failure is in the preparatory stage of S1 handoff procedure, initiates the flow process that the current S1 of cancellation switches by source eNB.
Preferably, after sending RRC connection re-establishment flow process to source eNB, connect if successfully set up RRC, then initiate to measure control flow by source eNB, the Target cell in the control tabulation is measured in deletion.
Further preferably, after initiating RRC connection re-establishment flow process to source eNB, said method also comprises: initiate the flow process that the current S1 of cancellation switches.
Preferably,, connect, then initiate access process at random if successfully set up RRC after source eNB or target eNB initiation RRC connection re-establishment flow process.
The present invention also provides the treatment system of S1 handoff failure in a kind of LTE system, and this system comprises: handoff failure trigger element, stage judging unit, switch and initiate unit, RRC connection re-establishment unit and resource delete cells, wherein:
Said handoff failure trigger element is used for after receiving the triggering of S1 handoff failure, calling said stage judging unit;
Said stage judging unit is used to judge that said handoff failure is in the stage of S1 handoff procedure, if be in the preparatory stage of S1 handoff procedure, then call to switch and initiates the unit to Target cell initiation S1 switching flow; If be in the execution phase of S1 handoff procedure, then call RRC connection re-establishment unit and initiate RRC connection re-establishment flow process; If be in the completion stage of S1 handoff procedure, then call the source eNB resource that resource delete cells deletion UE takies.
Preferably, said system comprises measures control initiation unit, and then: after source eNB initiation RRC connection re-establishment flow process, call when successfully setting up the RRC connection and measure control initiation unit initiation measurement control flow, the Target cell of controlling in tabulating is measured in deletion.
Preferably, said system also comprises at random inserting and initiates the unit, then: after source eNB or target eNB are initiated RRC connection re-establishment flow process, successfully do not set up to call when RRC connects to insert at random and initiate the unit and initiate access process at random.
The technical scheme of the embodiment of the invention adopts differential processing mode through different to the residing stage of S1 handoff failure; If in the preparatory stage, select to initiate again the S1 switching flow; If in the execution phase, select to initiate RRC connection re-establishment flow process; If in the completion stage, select to initiate resource deletion flow process.Compared with prior art; The embodiment of the invention stage by stage, the branch situation selects the processing after corresponding with it comparatively appropriate mode is carried out handoff failure; Preparatory stage selects to initiate again switching flow can increase the possibility that realizes that successfully S1 switches; The completion stage select to initiate the deletion flow process and can reduce the resource occupation to the LTE system, thereby the perfect performance of LTE system has solved prior art problems preferably.
Description of drawings
Fig. 1 is the organisational chart of LTE system;
Fig. 2 is the signaling diagram of S1 handoff procedure in the LTE system;
Fig. 3 is the signaling diagram of common handoff failure type in the S1 handoff procedure in the LTE system;
Fig. 4 is the flow chart of the embodiment of method of the present invention;
Fig. 5 is the signaling diagram of method embodiment of the present invention;
Fig. 6 is the composition frame chart of system implementation example of the present invention.
Embodiment
The present invention adopts differential processing mode to the stage of handoff failure then through the residing stage of the S1 of LTE system handoff failure is divided: if in the preparatory stage, select to initiate again switching flow; If in the execution phase, select to initiate RRC connection re-establishment flow process; If in the completion stage, select to initiate the deletion flow process.
For ease of understanding technical scheme of the present invention, the normal flow of earlier S1 in the LTE system being switched here briefly introduces.
When the UE as travelling carriage moves,, then need start the S1 switching flow: do not set up X2 interface between (1) source eNB and the target eNB if occur following situation in the LTE system between the base station; (2) source eNB is configured setting: when the EPC node changes, use the S1 interface to initiate to switch to target eNB; (3) source eNB attempts initiating to switch through X2 interface, sends the failure response message that has specific reasons but receive target eNB.Accompanying drawing 2 has provided the signaling process of the S1 of the LTE system switching of 3GPP related protocol regulation:
Source eNB detects after the position changes in the UE roam procedure, will send to UE and measure the control signaling, accomplishes the range finding work of UE, then with reporting measuring result source eNB.Source eNB switches ruling according to measurement and report report; When ruling need be initiated the switching based on the S1 interface; By source eNB structure Handover Required (switch and require) message, this message need to point out from source eNB to be forwarded to the loaded packet data of target eNB, then Handover Required message is sent to MME; MME receives the back according to Handover Required message constructing Handover Request (handoff request) message, and sends it to target eNB.Target eNB is carried out RRM (Radio Resource Management according to the parameter in the Handover Request message; RRM) resource audit; Judge whether to allow UE to insert this base station; Return Handover Request Acknowledge (Handover Request Acknowledge) message to MME after examining successfully, this message points out that target eNB is the TEID and the address of user plane downlink business and data forwarding traffic assignments.MME returns Handover Command (switching command) message to source eNB after receiving Handover Request Acknowledge message.Source eNB sends RRC connection reprovision (reconfiguring) message, the respective wireless resource that the request deletion had before taken to UE after receiving Handover Command message.Source eNB also sends eNB Status Transfer (state transitions) message through MME to target eNB, and with knowledge target eNB that the PDCP sequence number of E-RAB and HFN state are passed on, source eNB begins to transmit the carrying data to target eNB simultaneously.UE carries out this locality configuration after receiving RRC connection reallocation message on the one hand, accomplishes corresponding switching transition; Adhere to by cell-of-origin, UE place on the other hand and be synchronized to target eNB.When UE and target eNB synchronously after, insert the Target cell under the target eNB through RACH.After being accomplished to the cut-in operation of Target cell, target eNB is sent uplink assignment/timing to UE and is adjusted message.UE receives and sends RRC connection reprovision completion message to target eNB after message is adjusted in uplink assignment/timing.Target eNB is sent Handover Notify (switching notice) message to MME, and notice MME switching is finished.Upgrade bearer messages between MME and the S-GW subsequently, this process receives that with source eNB it is end mark that S-GW sends corresponding End Marker message.After accomplishing more new bearer overload work; MME sends UE Context Release Command (context release command) message to source eNB; Source eNB is to the UE assigned radio resource in the request deletion; After source eNB had deleted the local wireless sources that UE takies, structure UEContext Release Complete (context discharges and accomplishes) information and sending was given MME.So far, the whole S1 handoff procedure of LTE system is thoroughly accomplished.
Above-mentioned S1 handoff procedure is a S1 hand off signaling flow process under the normal condition of LTE related protocol regulation; Yet; S1 handoff procedure in the reality is owing to multiple reason; Various abnormal conditions often occur easily, common typical case does not receive that like: message packet loss source eNB switching command causes starting switch operating (accompanying drawing 3 (a)), Target cell resource congestion and causes handover resource allocation failure (accompanying drawing 3 (b)), RRC to connect reprovision initiating not success (accompanying drawing 3 (c)) of the local configuration in back.When these abnormal conditions occurring and cause the S1 handoff failure, the LTE related protocol does not provide concrete treating method.Although provided a kind of S1 handoff failure processing mode in the prior art, say that like background technology the processing of clean cut can not adapt to actual needs, be unfavorable for the perfect of LTE systematic function.
Based on the problem that above-mentioned prior art exists, embodiments of the invention have provided a kind of brand-new S1 handoff failure processing method, and this method is to different concrete conditions, and the selection differential scheme is tackled, and has solved prior art problems preferably.Referring to accompanying drawing 4, the processing method of a kind of LTE S1 of system handoff failure that the embodiment of the invention provides comprises:
Step S401: receive the S1 handoff failure and trigger, start S1 handoff failure handling process;
As stated; The S1 of LTE system handoff procedure is owing to various abnormal conditions will appear in multiple reason; These abnormal conditions will trigger the S1 handoff failure after occurring; The time point that triggers the S1 handoff failure possibly occur in any moment in the S1 handoff procedure, and UE, source eNB, target eNB all possibly become the triggering entity of handoff failure, and the particular type of handoff failure also demonstrates diversified characteristic; Common handoff failure triggers and comprises: (1) UE monitors signal difference after source eNB sends measurement and report message, in first Preset Time, does not receive and triggers the S1 handoff failure when RRC connects reallocation message; (2) source eNB when in second Preset Time, not receiving switching command message, triggers the S1 handoff failure after MME transmission switching requires message; (3) source eNB receives in second Preset Time and switches when preparing failed message after MME transmission switching requires message, triggers the S1 handoff failure; (4) UE receives when RRC connection reallocation message is configured success, triggers the S1 handoff failure; (5) source eNB when in the 3rd Preset Time, not receiving UE context release command message, triggers the S1 handoff failure after MME sends base station state transitions message; (6) UE is after target eNB is sent synchronization message, in the 4th Preset Time, do not receive uplink assignment/when message is adjusted in timing, triggering S1 handoff failure; First, second, third and fourth Preset Time here can be set according to the LTE running situation of reality; Signaling process by aforementioned S1; Know that first Preset Time should be longer than second Preset Time usually, the 3rd Preset Time should be longer than the 4th Preset Time usually.
Step S402: judge that said handoff failure is in the stage of S1 handoff procedure, if be in the preparatory stage of S1 handoff procedure, execution in step S403 then; If be in the execution phase of S1 handoff procedure, execution in step S404 then: if be in the completion stage of S1 handoff procedure, then execution in step S405;
Taking the prerequisite of different measure to the S1 handoff failure stage of living in is the stage division of clear and definite S1 handoff procedure; A complete S1 handoff procedure comprises three phases in the present embodiment: the stage is accomplished in handoff preparation phase, handover execution stage, switching; Handoff preparation phase is sent Handover Required message from source eNB and is played source eNB and receive when sending RRC after the Handover Command message connects reallocation message and end; This stage is to prepare for whole S1 handoff procedure provides resource; Because carrying out the S1 switch operating needs to transmit a series of data by source eNB to target eNB; Both sides need the item of the relevant communication of agreement in advance, after these work are accomplished the basis could be provided for the implementation that S1 switches; Handover execution stage is the core stage of accomplishing the S1 handoff procedure; This stage is carried out the essence switch step; Comprise relevant information that E-RAB is carried and source eNB data forwarding to target eNB, accomplish UE synchronously and insert work such as target eNB, when this stage plays target eNB and receives RRC reprovision completion message when eNB sends the RRC reallocation message from the source only; Switching the completion stage is that treatment S 1 is switched the follow-up matters of carrying out after finishing; As discharging items such as data handing-over between local resource, source eNB and the S-GW that UE takies, beared information renewal, this stage receives when the RRC reprovision plays MME when accomplishing message (UE is synchronized to Target cell) and receives UE Context Release Complete message from target eNB and ends; The S1 switching flow marked off to judge the stage that the S1 handoff failure takes place after the stage, and then carry out corresponding specific aim work of treatment.
Step S403: initiate the S1 switching flow to Target cell;
Handoff failure triggers the preparatory stage that is in the S1 switching flow; The also completion of relevant preparation that realizes that S1 switches is described; But this process has been set up RRC and has been connected, and to this kind situation, selects here to initiate the S1 switching flow to Target cell; The Target cell here comprises former Target cell, also comprises UE collected alternative cell when source eNB sends measurement and report.
Step S404: initiate RRC connection re-establishment flow process;
Handoff failure triggers the execution phase that is in the S1 switching flow; Explain and realize that the relevant preparation that S1 switches accomplishes; Reason according to causing the execution phase is different, selects different RRC connection re-establishment flow process modes: when UE monitors signal difference after source eNB sends measurement and report message, in first Preset Time, do not receive RRC connection reallocation message and when triggering the S1 handoff failure; Judge whether source eNB sends RRC and connect reallocation message; If then the S1 handoff failure is in the execution phase of S1 handoff procedure, initiate RRC connection re-establishment flow process to UE by source eNB; It should be noted that and judge here whether source eNB sends RRC connection reallocation message and send the realization of RRC connection re-establishment request message through UE to source eNB; Connect reallocation message if source eNB has sent RRC, then respond the request message of this UE, can initiate RRC connection re-establishment flow process; When UE receives that RRC connects that reallocation message is configured success and when triggering the S1 handoff failure, the S1 handoff failure is in the execution phase of S1 handoff procedure, initiates RRC connection re-establishment flow process by UE to target eNB; When UE after target eNB is sent synchronization message; In the 4th Preset Time, do not receive uplink assignment/timing to adjust message and when triggering the S1 handoff failure; The S1 handoff failure is in the execution phase of S1 handoff procedure, initiates RRC connection re-establishment flow process by UE to target eNB.
Step S405: the source eNB resource that deletion UE takies.
Handoff failure triggers the completion stage that is in the S1 switching flow; Explain and realize that the relevant preparation that S1 switches and the core work of switching accomplish; At this moment the source eNB resource of selecting deletion UE to take, and do not initiate S1 switching flow or RRC connection re-establishment flow process again.
The processing method of the S1 handoff failure that present embodiment provides adopts differential processing mode through different to the residing stage of S1 handoff failure; If in the preparatory stage, select to initiate again the S1 switching flow; If in the execution phase, select to initiate RRC connection re-establishment flow process; If accomplish the stage, select to initiate the deletion flow process at S.Compared with prior art; Present embodiment stage by stage, the branch situation selects the processing after corresponding with it comparatively appropriate mode is carried out handoff failure; Preparatory stage selects to initiate again switching flow can increase the possibility that realizes that successfully S1 switches; The completion stage select to initiate the deletion flow process and can reduce the resource occupation to the LTE system, thereby the perfect performance of LTE system has solved prior art problems preferably.
Introduce the application process of the above embodiment of the present invention in detail below in conjunction with S1 hand off signaling flow process.Referring to accompanying drawing five, the control to Preset Time in following flow process is accomplished through the numerical value of the relevant timer of detection, represents the entire flow that S1 switches in order more to know, the sequence number that identifies among the figure is the handoff procedure after the S1 switching overcomes various abnormal conditions.
Step 501: source eNB monitors after UE roaming causes the position to change, and sends to UE and measures the control signaling, so that the measurement control through roaming restricted information configuration UE; Start the arrival that timer is waited for the measurement and report message of UE after sending measurement control order.If before the Preset Time that timer is set is overtime; Source eNB does not receive the measurement and report message from UE, explains that UE does not accomplish surveying work or measurement and report information drop-out, when this situation occurring; Source eNB initiates above-mentioned measurement control procedure again with the timer zero clearing.
After the measurement control order message of step 502:UE reception sources eNB, generate measurement report and this report is reported source eNB according to the measurement rule that presets; UE starts the arrival that timer is waited for the RRC connection reallocation message of source eNB after sending measurement report.If before first Preset Time that timer is set is overtime; UE does not receive that RRC connects reallocation message; Unsuccessful or the resource allocation success of the preparation (resource allocation of target eNB) of S1 handoff procedure is described but RRC that source eNB sends connects reallocation message loses, although in most cases the former possibility is higher, in order to take measures targetedly; Here be necessary further to distinguish UE and do not receive that RRC connects the reason of reallocation message; For this reason, UE sends RRC connection re-establishment request message to source eNB and target eNB, and source eNB checks whether our station sends RRC to UE and connect reallocation message after receiving this request message:
If not sending RRC to UE, source eNB connects reallocation message; Explain that then the reason that aforementioned circumstances occurs possibly be that the Target cell resource congestion causes the resource allocation of target eNB unsuccessful; This moment, handoff failure was in the preparatory stage, and source eNB does not respond the RRC connection re-establishment request message of UE transmission and initiates the S1 switching flow again by source eNB;
If sending RRC to UE, source eNB connects reallocation message; Explain that then the reason that aforementioned circumstances occurs possibly be that LTE system communication environment badly causes RRC to connect the reallocation message packet loss; This moment, handoff failure was in the execution phase, and the RRC connection re-establishment request message that source eNB response UE sends is initiated RRC connection re-establishment flow process by source eNB to UE; Here RRC connects reallocation message and is sent by source eNB, has accomplished resource allocation work before target eNB be described, in order to reduce the wasting of resources, is necessary also to initiate to cancel the flow process of current S1 switching, so that discharge the resource of above-mentioned distribution.
Step 503: after source eNB receives the measurement report of UE transmission; RRM information according to measurement report; Carry out ruling to whether initiating the S1 handoff procedure; Need carry out the S1 switching flow through ruling, source eNB sends Handover Require message to MME and gives MME, and starts the arrival that timer is waited for Handover Command message:
If before second Preset Time that timer is set is overtime; Source eNB receives Handover Preparation Failure (switch and prepare failure) message; Explain that handoff failure is in the preparatory stage; Source eNB zero clearing timer then, and initiate the S1 switching flow to Target cell, initiate the S1 switching flow to Target cell and specifically comprise: judge to switch and prepare the content that failed message carries; Carried one of " Target cell non-availability ", " Target cell does not allow to switch ", " Target cell ID is unknown ", " Radio Resource non-availability " if switch the preparation failed message, then initiated the S1 switching flow to alternative target cells; If do not carry the above-mentioned information content, then initiate the S1 switching flow to former Target cell.
If before second Preset Time that timer is set was overtime, source eNB did not receive Handover Preparation Failure message, does not receive Handover Command message yet; Explain that handoff failure is in the preparatory stage; But target eNB has been accomplished resource allocation work probably, in such cases, and earlier by source eNB zero clearing timer; Former sub-district to former target eNB is initiated the S1 switching flow again, and source eNB also initiates to cancel the flow process that current S1 switches simultaneously.
Step 504:MME will send Handover Request handoff request message to target eNB after receiving the Handover Require message of source eNB transmission, and request target eNB is the work allocation resource that is about to carry out the S1 handover execution stage.
Step 505: purpose eNB carries out resource allocation after receiving the Handover Request message that MME sends.If Resources allocation work is success not, then target eNB is sent Handover Preparation Failure message through MME to source eNB; If the resource that becomes distribution of work S1 switchings to need, target eNB structure Handover Request Acknowledge (Handover Request Acknowledge) message then, and start A, B timer, the arrival of wait MME Status Transfer message after this message sent to MME.
If before A timer Preset Time is overtime, target eNB is not received MME Status Transfer message, and then the zero clearing timer is not handled the RRC connection re-establishment message that UE sends.
If before A timer Preset Time is overtime; Target eNB is received MME Status Transfer message; Then: (1) if before B timer Preset Time is overtime, target eNB is received the RRC connection re-establishment message that UE sends, then zero clearing B timer; Respond this RRC connection re-establishment message and accomplish and being connected of target eNB, switch the execution work completion; (2) if before B timer Preset Time is overtime, target eNB is not received the RRC connection re-establishment message that UE sends, and does not receive the synchronization message that UE sends yet, and explains that then UE is the RRC connection re-establishment flow process of initiating to source eNB, carries out handled by source eNB; (3) if before B timer Preset Time is overtime; Target eNB is not received the RRC connection re-establishment message that UE sends, but receives the synchronization message that UE sends, and explains that UE has been synchronized to target eNB; Then zero clearing B timer needn't wait for that the RRC that UE sends connects reprovision completion message.
What need explain here a bit is: the data-transmission mode of the RLC entity that target eNB is selected is different; Above-mentioned processing to MME Status Transfer message is difference slightly; Above-mentioned introduction mainly be that RLC solid data transmission mode is the situation of affirmation mode; If RLC solid data transmission mode is a Unacknowledged Mode; Because Unacknowledged Mode need not waited for MME Status Transfer message, thinks when the A timer reaches Preset Time and receives this message, handles according to above-mentioned flow process then.
After step 506:MME receives the Handover Request Acknowledge message of target eNB transmission; Send Handover Command message to source eNB; This message comprises Target to Source Transparent Container, the wireless relevant parameter of the target eNB of transparent transmission.
Step 507: after source eNB receives the Handover Command message of MME transmission; Connect reallocation message according to Target to Source Transparent Container composition of content RRC in this message; And this message sent to UE, execution in step S511 simultaneously.
Step 508:UE receives and carries out this locality configuration after RRC connects reallocation message.If local configuration successful then gets into step S511; If local configuration is unsuccessful; Then trigger the S1 handoff failure; This handoff failure is in the execution phase of S1 handoff procedure, then UE to source eNB initiate RRC connection re-establishment flow process with rebulid with source eNB between RRC be connected, after this connection foundation; Source eNB initiates to measure control flow once more, and the Target cell in the control tabulation is measured in deletion; Because this handoff failure occurs in handover execution stage, therefore switch preparation (the resource allocation work of target eNB) and accomplish, in order to reduce the wasting of resources, when source eNB initiates to measure control flow, also initiate the flow process that the current S1 of cancellation switches.
Step S509: source eNB sends eNB Status Transfer (base station state transitions) message and gives MME, and this message comprises up PDCP-SN, HFN accepting state and descending PDCP-SN, HFN accepting state; Start timer then and wait for the arrival of UE Context Release Command message.If before the 3rd Preset Time that timer is set is overtime; Source eNB does not receive UE Context Release Command message; Trigger the S1 handoff failure, this handoff failure is in the completion stage of S1 handoff procedure, then zero clearing timer; UE constructs UE Context Release Request message, and this message is sent to source eNB so that the resource that deletion UE takies.
Step S510:MME sends MME Status Transfer message to target eNB after receiving source eNB transmission eNB Status Transfer message.
Step S511:UE sends synchronization message to target eNB, and is synchronized to target eNB, inserts the Target cell in the target eNB through RACH; The arrival of message is adjusted in the uplink assignment/timing that starts the transmission of timer wait target eNB after the transmission synchronization message.If before the 4th Preset Time that timer is set is overtime; UE does not receive that uplink assignment/timing adjusts message, then triggers the S1 handoff failure, and this handoff failure is in the execution phase of S1 switching flow; Zero clearing timer is then initiated the flow process of RRC connection re-establishment to target eNB; If before the 4th Preset Time that timer is set is overtime, UE receives that uplink assignment/timing adjusts message, then execution in step S513.
Step S512: after target eNB receives the synchronization message of UE transmission, send uplink assignment/timing to UE and adjust message.
Step S513:UE receives and inserts Target cell after message is adjusted in uplink assignment/timing that target eNB sends, then sends RRC to target eNB and connects reprovision and accomplish message, to confirm to switch the execution work end.
Step S514: target eNB is sent Handover Notify message informing UE to MME and has been synchronized to Target cell after receiving the RRC connection reprovision completion message of UE transmission.
It is mutual to upgrade bearer messages between step S515:MME and the S-GW.
Step S516:MME sends UE Context Release Command message, the local resource that requires deletion source eNB deletion UE to take to source eNB.
Step S517: behind the local resource that source eNB deletion UE takies, send UE UE Context Release Complete message up and down to MME, the completion stage of S1 handoff procedure finishes.
Foregoing has been introduced method embodiment of the present invention in detail, and accordingly, the present invention also provides the S1 of LTE system handoff failure treatment system.Referring to accompanying drawing 6, native system 600 comprises: unit 603, RRC connection re-establishment unit 604 and resource delete cells 605 are initiated in handoff failure trigger element 601, stage judging unit 602, switching, wherein:
Handoff failure trigger element 601 is used for after receiving the triggering of S1 handoff failure, calling said stage judging unit 602;
The course of work of system embodiment 600 of the present invention is: receive at handoff failure trigger element 601 and call said stage judging unit 602 after the S1 handoff failure triggers; Be in the stage of S1 handoff procedure by the said handoff failure of this unit judges; If be in the preparatory stage of S1 handoff procedure, then call to switch and initiate unit 603 to Target cell initiation S1 switching flow; If be in the execution phase of S1 handoff procedure, then call the flow process that the RRC connection re-establishment is initiated in RRC connection re-establishment unit 604; If be in the completion stage of S1 handoff procedure, then call the resource that resource delete cells 605 deletion UE take.
The processing method of the S1 handoff failure that system embodiment of the present invention provides adopts differential processing mode through different to the residing stage of S1 handoff failure; If in the preparatory stage, select to initiate again switching flow; If in the execution phase, select to initiate RRC connection re-establishment flow process; If in the completion stage, select to initiate the deletion flow process.Compared with prior art; Present embodiment stage by stage, the branch situation selects the processing after corresponding with it comparatively appropriate mode is carried out handoff failure; Preparatory stage selects to initiate again switching flow can increase the possibility that realizes that successfully S1 switches; The completion stage select to initiate the deletion flow process and can reduce the resource occupation to the LTE system, thereby the perfect performance of LTE system has solved prior art problems preferably.
It should be noted that: the said system instance is when concrete the application; The time point that failure triggers owing to switch can be in any time point of the S1 of LTE system switching flow; Therefore native system embodiment will be arranged in UE, source eNB, the target eNB equipment according to actual needs simultaneously; During operation, undertaken by the corresponding units cooperation of the native system embodiment that is provided with in UE, source eNB, three equipment of target eNB, they do as a whole playing a role.
The system embodiment of the invention described above comprises that measuring control initiates unit 606; Then: after the flow process of initiating the RRC connection re-establishment; Call when successfully setting up the RRC connection and measure control initiation unit initiation measurement control flow, the Target cell of controlling in tabulating is measured in deletion.
The system embodiment of the invention described above also can comprise at random inserting initiates unit 607, then: after the flow process of initiating the RRC connection re-establishment, initiate the unit and initiate access process at random successfully not setting up to call when RRC connects to insert at random.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of invention.
Claims (11)
1. the processing method of S1 handoff failure in the LTE system is characterized in that this method comprises:
The S1 handoff failure judges that said handoff failure is in the stage of S1 handoff procedure after triggering, if be in the preparatory stage of S1 handoff procedure, then initiates the S1 switching flow to Target cell; If be in the execution phase of S1 handoff procedure, then initiate RRC connection re-establishment flow process; If be in the completion stage of S1 handoff procedure, then delete the source eNB resource that UE takies.
2. method according to claim 1 is characterized in that, said S1 handoff failure triggers and comprises:
UE monitors signal difference after source eNB sends measurement and report message, in first Preset Time, does not receive and triggers the S1 handoff failure when RRC connects reallocation message; Or,
Source eNB does not receive in second Preset Time when switching command message is prepared failed message with switching after MME transmission switching requires message, triggering S1 handoff failure; Or,
Source eNB receives in second Preset Time and switches when preparing failed message after MME transmission switching requires message, triggers the S1 handoff failure; Or,
UE receives when RRC connection reallocation message is configured success, triggers the S1 handoff failure; Or,
Source eNB when in the 3rd Preset Time, not receiving UE context release command message, triggers the S1 handoff failure after MME sends base station state transitions message; Or,
UE does not receive uplink assignment/when message is adjusted in timing, triggering S1 handoff failure in the 4th Preset Time after target eNB is sent synchronization message.
3. method according to claim 2 is characterized in that:
When UE monitors signal difference after source eNB sends measurement and report message; In first Preset Time, do not receive RRC to connect reallocation message and when triggering the S1 handoff failure; Judge whether source eNB sends RRC and connect reallocation message, if then the S1 handoff failure is in the execution phase of S1 handoff procedure; If then the S1 handoff failure is in the preparatory stage of S1 handoff procedure not; Or,
When source eNB to MME send to switch require message after, do not receive that in second Preset Time switching command message prepares failed message and when triggering the S1 handoff failure, the S1 handoff failure is in the preparatory stage of S1 handoff procedure with switching; Or,
When source eNB to MME send to switch require message after, in second Preset Time, receive to switch and prepare failed message and when triggering handoff failure, the S1 handoff failure is in the S1 handoff procedure preparatory stage; Or,
When UE receives that RRC connects that reallocation message is configured success and when triggering the S1 handoff failure, the S1 handoff failure is in the execution phase of S1 handoff procedure, initiates RRC connection re-establishment flow process by UE to target eNB; Or,
When source eNB after MME sends base station state transitions message; In the 3rd Preset Time, do not receive UE context release command message and when triggering the S1 handoff failure; The S1 handoff failure is in the completion stage of S1 handoff procedure, sends the UE context by UE to source eNB and discharges request message so that delete the source eNB resource that UE takies; Or,
When UE after target eNB is sent synchronization message; In the 4th Preset Time, do not receive uplink assignment/timing to adjust message and when triggering the S1 handoff failure; The S1 handoff failure is in the execution phase of S1 handoff procedure, initiates RRC connection re-establishment flow process by UE to target eNB.
4. method according to claim 3; It is characterized in that; When source eNB to MME send to switch require message after; Do not receive that in second Preset Time S1 handoff failure was in the preparatory stage of S1 handoff procedure when switching command message triggered the S1 handoff failure with switching the preparation failed message, then initiate the S1 switching flow to the former Target cell of former target eNB; Or,
When source eNB to MME send to switch require message after, in second Preset Time, receive to switch and prepare failed message and when triggering handoff failure, the S1 handoff failure is in the S1 handoff procedure preparatory stage, then initiates the S1 switching flow to Target cell and comprises:
Judge to switch to prepare whether failed message carries the Target cell non-availability or Target cell does not allow to switch or the Target cell ID the unknown or the unavailable information content of Radio Resource, if then initiate the S1 switching flow to alternative target cells; If, then do not initiate the S1 switching flow to the former Target cell of former target eNB.
5. method according to claim 3; It is characterized in that; Said method also comprises: when source eNB to MME send to switch require message after; Do not receive that in second Preset Time S1 handoff failure was in the preparatory stage of S1 handoff procedure when switching command message triggered the S1 handoff failure with switching the preparation failed message, initiate the flow process that the current S1 of cancellation switches by source eNB.
6. according to any one described method in the claim 1 to 5, it is characterized in that, after initiating RRC connection re-establishment flow process, connect that then initiate to measure control flow by source eNB, the Target cell in the control tabulation is measured in deletion if successfully set up RRC.
7. method according to claim 6 is characterized in that, after initiating RRC connection re-establishment flow process, said method also comprises: initiate the flow process that the current S1 of cancellation switches.
8. according to any one described method in the claim 1 to 5, it is characterized in that, after initiating RRC connection re-establishment flow process, do not connect, then initiate access process at random if successfully set up RRC.
9. the treatment system of S1 handoff failure in the LTE system is characterized in that this system comprises: handoff failure trigger element, stage judging unit, switches and initiates unit, RRC connection re-establishment unit and resource delete cells, wherein:
Said handoff failure trigger element is used for after receiving the triggering of S1 handoff failure, calling said stage judging unit;
Said stage judging unit is used to judge that said handoff failure is in the stage of S1 handoff procedure, if be in the preparatory stage of S1 handoff procedure, then call to switch and initiates the unit to Target cell initiation S1 switching flow; If be in the execution phase of S1 handoff procedure, then call RRC connection re-establishment unit and initiate RRC connection re-establishment flow process; If be in the completion stage of S1 handoff procedure, then call the source eNB resource that resource delete cells deletion UE takies.
10. system according to claim 9; It is characterized in that; Said system comprises that measuring control initiates the unit; Then: after initiating RRC connection re-establishment flow process, call measurement control initiation unit when successfully setting up the RRC connection and initiate the measurement control flow, delete and measure the Target cell of controlling in the tabulation.
11. system according to claim 9 is characterized in that, said system also comprises at random inserting and initiates the unit, then: after initiating RRC connection re-establishment flow process, successfully do not set up to call when RRC connects to insert at random and initiate the unit and initiate access process at random.
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