CN101938757B - Method, base station and system for detecting premature handover - Google Patents

Method, base station and system for detecting premature handover Download PDF

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Publication number
CN101938757B
CN101938757B CN200910151041.XA CN200910151041A CN101938757B CN 101938757 B CN101938757 B CN 101938757B CN 200910151041 A CN200910151041 A CN 200910151041A CN 101938757 B CN101938757 B CN 101938757B
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information
target cell
cell
target
switching
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CN101938757A (en
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杨学君
彼得·莱格
王君
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

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Abstract

The embodiment of the invention relates to a method, a base station and a system for detecting premature handover. The method comprises the following steps of: acquiring handover event information of user equipment, wherein the handover event information comprises a cell identifier, a UE identifier and radio link failure (RLF) information or handover failure (HOF) information; acquiring handover record information of the UE according to the handover event information of the UE, wherein the handover record information of the UE stores the handover state of the UE and the corresponding relationship between a source cell and a target cell on which the UE has a handover; and determining that the UE has a premature handover event between the source cell and the target cell according to the handover record information of the UE. In the embodiment of the invention, a source base station determines that the premature handover event happened between the UE and a target base station according to the handover record information corresponding to the UE, saves a signaling interaction between the source base station and the target base station, and improves the utilization efficiency of wireless network resources.

Description

Detect too early changing method, base station and system
Technical field
The present invention relates to the communications field, particularly detect too early changing method, base station and system.
Background technology
Self-organizing network (Self-Organizing Network, hereinafter to be referred as SON) have flexibly, self-organizing, extensibility is strong and the characteristics such as load balancing, some normal structures, as 3GPP, Wimax Forum etc., just energetically the correlation technique of SON is introduced follow-on mobile communication standard.
Travelling performance is optimized (Mobility Robustness Optimization, hereinafter to be referred as MRO) be the important content of SON, it guarantees travelling performance by the relevant parameter of mobility is automatically configured and automatically adjusts, and reaches the target of optimization as performance of handoffs.Wherein, the mobility relevant parameter comprises: handoff parameter and cell reselection parameters.
Particularly, network detects dependent event and it is added up, and based on relevant statistic, network is determined need the parameter of adjusting and how to adjust.Here said dependent event comprises: switched evening, and switched too early, and switched to wrong cell, unnecessary switching etc.Dynamically adjust the handoff parameter in SON, within the incidence of dependent event in network can being controlled at target zone, thereby improve systematic function.
Handover event refers to that the switching from the cell-of-origin to the Target cell occurs too early too early, cause UE can not successfully switch to Target cell, perhaps successful switch is also unstable later on to Target cell, Radio Link Failure (Radio Link Failure occured in the short time, hereinafter to be referred as RLF), UE attempts again to set up wireless connections in the cell-of-origin afterwards.Particularly, the feature of handover event comprises too early:
1, UE after success switches to Target cell by the cell-of-origin, RLF occurs in the short time;
2, UE fails in handoff procedure and is linked into Target cell generation handoff failure (HO Failure is called for short HOF);
3, UE fails and sends Radio Resource and control (Radio Resources Control, RRC) and connect to reshuffle and complete (as RRC Connection Reconfiguration Complete) message and produce RLF;
4, UE rebuilds and is connected to the cell-of-origin.
The detection of handover event is most important for MRO too early.Prior art provides the based target base station too early handover event detection method.Be target BS as detecting entity, collect relevant information, and judge whether to occur too early handover event.Idiographic flow is: at subscriber equipment (User Equipment, hereinafter to be referred as UE) switch to the process of target BS from source base station, too early handover event has occured between UE and target BS, UE sends RRC connection reconstruction request (as RRC ConnectionReestablishment Request) message to source base station, with rebulid and source base station between wireless connections.source base station is based on the reconstruction cause information that carries in RRC connection reconstruction request message (for example: RLF information or HOF information), send the identification information of UE (as Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (CellRadio Network Temporary Identifier to target BS, hereinafter to be referred as C-RNTI), Physical Cell Identifier (Physical Cell Indentity, hereinafter to be referred as PCI) etc.), RLF has occured in certain UE of notification target base station when the cell-of-origin switches to Target cell, then, target BS judges whether this UE too early handover event has occured when switching to Target cell from the cell-of-origin, and return to judged result to source base station.
In realizing process of the present invention, the inventor finds to have at least following defective in prior art: source base station need to by and target BS between repeatedly information interaction, can know just whether too early handover event occurs, increase the Signalling exchange between source base station and target BS, reduced the service efficiency of wireless network resource.
Summary of the invention
The embodiment of the present invention provides a kind of detection too early changing method, comprising: obtain the handover event information of user equipment (UE), this handover event information comprises cell ID, UE sign and Radio Link Failure RLF information or handoff failure HOF information; According to the switching recorded information of the above-mentioned UE of handover event acquisition of information of above-mentioned UE, the switching recorded information of this UE is preserved the switching state of above-mentioned UE and cell-of-origin that above-mentioned UE switches and the corresponding relation of Target cell; Determine that according to the switching recorded information of above-mentioned UE too early handover event occurs above-mentioned UE between described cell-of-origin and Target cell.
The embodiment of the present invention provides a kind of base station, comprising: the first acquiring unit, and for the handover event information of obtaining user equipment (UE), this handover event information comprises cell ID, UE sign and Radio Link Failure RLF information or handoff failure HOF information; Second acquisition unit is used for the switching recorded information according to this UE of handover event acquisition of information of above-mentioned UE, and the switching recorded information of this UE is preserved the switching state of this UE and cell-of-origin that this UE switches and the corresponding relation of Target cell; And detecting unit, be used for determining that according to the switching recorded information of above-mentioned UE too early handover event occurs this UE between cell-of-origin and Target cell.
The embodiment of the present invention also provides a kind of detection too early switched system, comprise that subscriber equipment switches target BS and source base station, wherein source base station is above-described base station.
As shown from the above technical solution, in the embodiment of the present invention, the switching recorded information that source base station is corresponding according to UE determines to occur between UE and target BS too early handover event, save the Signalling exchange between source base station and target BS, improved the service efficiency of wireless network resource.
Description of drawings
The method flow schematic diagram that Fig. 1 switches too early for the detection that the embodiment of the present invention one provides;
The method flow schematic diagram that Fig. 2 switches too early for the detection that the embodiment of the present invention two provides;
The method flow schematic diagram that Fig. 3 switches too early for the detection that the embodiment of the present invention three provides;
The method flow schematic diagram that Fig. 4 switches too early for the detection that the embodiment of the present invention four provides;
The architecture of base station schematic diagram that Fig. 5 provides for the embodiment of the present invention five.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
The schematic flow sheet of the too early changing method of detection that Fig. 1 provides for the embodiment of the present invention one.As shown in Figure 1, the present embodiment can comprise:
101, obtain the handover event information of user equipment (UE), this handover event information comprises cell ID, UE sign and Radio Link Failure RLF information or handoff failure HOF information.
102, according to the switching recorded information of this UE of handover event acquisition of information of above-mentioned UE, the switching recorded information of this UE is preserved the switching state of above-mentioned UE and cell-of-origin that above-mentioned UE switches and the corresponding relation of Target cell.
103, determine that according to the switching recorded information of above-mentioned UE too early handover event occurs above-mentioned UE between described cell-of-origin and Target cell.
The too early changing method of the detection that the present embodiment provides can be applied in the system that can realize SON, below each embodiment be that example describes with Long Term Evolution (Long Term Evolution is hereinafter to be referred as LTE) system, but be not limited to the LTE system.In the LTE system, each eNB (evolved-Node B, evolution base station) comprises that a plurality of residential quarters, eNB are the unique sign ID of each cell allocation, and this ID is called residential quarter ID, to distinguish different residential quarters.When UE is served in certain residential quarter, the eNB under this residential quarter will distribute to unique ID of this UE, and this ID is called UE ID.Wherein, the ID that source eNB distributes to the cell-of-origin is called cell-of-origin ID, and the ID that source eNB distributes to UE is called cell-of-origin UE ID, and the ID that target eNB is distributed to Target cell is called Target cell ID, and the ID that target eNB is distributed to UE is called Target cell UE ID.Base station under Target cell is called target BS (as target eNB), and the base station under the cell-of-origin is called source base station (as source eNB).
In the present embodiment, when the cell-of-origin of UE from the eNB of source moves to Target cell in target eNB, cause the channel condition of UE that change has occured.After UE measures the channel condition of target eNB, send measurement report to source eNB; Then, source eNB makes switch decision according to this measurement report, determines that UE will switch in target eNB, and source eNB sends handover request (as HandoverRequest) message to target eNB, carries out to switch with notification target eNB and prepares.After target eNB is ready for switching, return to switching request response (as Handover Request ACK) message to source eNB, carry the information such as Target cell ID and Target cell UE ID in this handover request ack message.After source eNB received this handover request ack message, Target cell ID and the Target cell preserved wherein were the sign (being Target cell UE ID, as C-RNTI) that UE distributes, and safeguarded that switches a recorded information.Safeguarding in the eNB of source has a switching timer relevant to the switching recorded information of this UE, the time limit that the duration of this switching timer switches recorded information for preserving this.Meanwhile, the cell-of-origin sends switching command (as Handover command) to UE.After UE received this switching command, disconnection was connected with source eNB's, accesses and set up RRC in target eNB, and successful switch is in Target cell corresponding to Target cell ID.
After Target cell, namely Target cell successfully sends UE contextRelease to the cell-of-origin when the UE successful switch, if produce Radio Link Failure in the short time, can cause UE that too early handover event occurs between cell-of-origin and Target cell.
In the LTE system, if during the handoff parameter unreasonable allocation, too early handover event will occur, make UE can't successfully switch to target eNB.Wherein, too early handover event is before switch overtime, and UE switches to from the cell-of-origin handoff failure event that causes due to reasons such as RLF, HOF the process of Target cell.
Whether successful switch is to Target cell according to UE, too early handover event can be divided two types.In the present embodiment, take source eNB, the too early handover event of following two types is detected as example and describes, but be not limited to the too early handover event of following two types:
The first too early handover event, namely UE does not have successful switch to Target cell, can comprise following three kinds of forms:
The first form, UE successfully receives the switching command that source eNB sends, but before timer T304 is overtime, and UE fails to be linked into Target cell always, produces HOF.
This moment, UE was with cell-of-origin ID, cell-of-origin UE ID (for example C-RNTI) with rebuild cause information and be carried in the request of RRC connection reconstruction to source eNB transmission, reconnected to source eNB with request.Reason due to Radio Link, when UE sends to source eNB with RRC connection reconstruction request message with failing, after causing the failure of RRC connection reconstruction, (Idle) pattern that UE enters the free time, Non-Access Stratum (Non-AcessStratum is hereinafter to be referred as NAS) by UE triggers RRC foundation.Connect by RRC the request of setting up, again to cell-of-origin report HOF event and RRC connection reconstruction turkey, RRC connected the request of foundation and comprised this moment: cell-of-origin ID, cell-of-origin UE ID, and HOF event and RRC connection reconstruction turkey afterwards.
The second form, UE successfully had been linked into Target cell before timer T304 is overtime, but sending RRC connection reprovision to Target cell completes (RRC connectionreconfiguration complete) message with failing, produces RLF.This moment, UE still used the configuration of cell-of-origin, and cell-of-origin ID, cell-of-origin UE ID (for example C-RNTI) and reconstruction cause information are carried in the request of RRC connection reconstruction and send to source eNB.When the RRC reconstruction failure, NAS triggering RRC by UE sets up message, and connect by RRC and set up message and again report RLF event and RRC connection reconstruction turkey before, the RRC connection of this moment is set up message and is comprised: cell-of-origin ID, cell-of-origin UE ID, RLF event, and the RRC connection reconstruction turkey of cell-of-origin.
The third form, with the second form class seemingly, when difference was to produce RLF, UE used the configuration of Target cell, carried Target cell ID, Target cell UE ID (for example C-RNTI) and rebuild cause information in the RRC connection reconstruction request of source eNB transmission.
The second too early handover event, namely UE has successfully switched to Target cell, but produces at short notice RLF.This moment, UE was with Target cell ID, Target cell UE ID (for example C-RNTI) with rebuild cause information and be carried in the request of RRC connection reconstruction to source eNB transmission, reconnected to source eNB with request.When the RRC reconstruction failure, trigger RRC by the NAS of UE and set up message.
In the present embodiment, for after handover event occurs too early, service outage duration in reducing to switch, at first UE can start the flow process of the fast quick-recovery of Radio Link, realizes that UE is in the wireless connections between reconstruction and source eNB after handoff failure.If fast quick-recovery flow process failure, UE further triggers the NAS process and sets up wireless connections.Concrete flow process will describe at further part.
Before switch overtime, source eNB receives the request of RRC connection reconstruction or the RRC connection foundation request that UE sends, and carries identification information in above-mentioned request and rebuilds cause information (as RLF information, HOF information).This identification information comprises identification information and the residential quarter id information before UE rebuilds, and the identification information before this UE rebuilds can be cell-of-origin UE ID, and this residential quarter id information can be cell-of-origin ID or Target cell ID.When source eNB detects this reconstruction cause information and is RLF or HOF, source eNB obtains switching recorded information corresponding to this UE according to the identification information of UE, this switching recorded information is preserved the switching state of UE, can indicate cell-of-origin that UE switches and the corresponding relation of Target cell.After source eNB gets this switching recorded information, can switch recorded information according to this and judge UE whether too early handover event has occured between described cell-of-origin and Target cell, if source eNB increases once the record of handover event too early; If not, process ends.
Need to prove, after above-mentioned too early handover event occurs, the identification information that carries in the request of RRC connection reconstruction and reconstruction cause information are different, correspondingly the eNB switching recorded information obtained in source is not identical yet, therefore, the present embodiment provides following two kinds of different detection methods for above-mentioned dissimilar too early handover event:
The first detection method, can be for detection of the first form and the second form of the first too early handover event:
(1) for the first form of the first too early handover event.
Need to prove, in the first form of the first too early handover event, UE fails and is linked into Target cell, produced HOF, after the first form of the first too early handover event occurs, the RRC connection reconstruction that source eNB receives or RRC connect the identification information that carries in the request of foundation and comprise: cell-of-origin UE ID and cell-of-origin ID, the reconstruction cause information is: HOF information.
Further, in the LTE system, during to Target cell, target eNB sends the UE context to source eNB and discharges (UE Context Release) message, discharges context (Context) information of the UE that self preserves with indication source eNB when the UE successful switch.Wherein, the contextual information of UE is preserved the switching state of UE.Due in the first form of the first too early handover event, UE not successful switch to Target cell, still preserve the contextual information of UE in the eNB of source, therefore, the switching recorded information of obtaining in the first detection method can be the contextual information that UE distributes for the cell-of-origin.
Safeguarding in the source eNB of the present embodiment has a switching timer, when source eNB receives the UE context release message of target eNB transmission, starts this switching timer, and discharges the context message of this UE; If source eNB does not receive UE context release message, do not start this switching timer, usually also preserve the contextual information of UE in the eNB of source.The duration of this switching timer can pass through external interface (network management system (Network Management System for example, hereinafter to be referred as NMS), Element management system (Element Management System, EMS) by northbound interface Itf-N or southbound interface Itf-S) arrange, the duration value of this switching timer can be determined according to the time length that the UE that allows in too early handover event stops in Target cell.
As shown in the above description, after handover event occured too early, UE sent the request of RRC connection reconstruction to source eNB, carried cell-of-origin UE ID, cell-of-origin ID in this RRC connection reconstruction request and rebuild cause information.When switching timer does not start, after source eNB receives this RRC connection reconstruction request, at first determine that the reconstruction cause information in this RRC connection reconstruction request is RLF information or HOF information, then according to this cell-of-origin ID and cell-of-origin UE ID, find out the contextual information of this UE from the memory device of self, preserve in this contextual information UE relevant information (such as: aforesaid switching target small area preparations etc.) and the information such as switching state of UE, this contextual information is used to indicate cell-of-origin that UE switches and the corresponding relation of Target cell.At last, source eNB determines that according to the contextual information that finds out too early handover event has occured UE between cell-of-origin and Target cell.At this moment, when source eNB receives the request of RRC connection reconstruction, switching timer is in not starting state, and the reconstruction cause information in the request of RRC connection reconstruction is HOF information, determines that this too early handover event is the first too early handover event.
(2) for the second form of the first too early handover event.
Although UE successfully has been linked into Target cell, sending RRC connection reprovision to Target cell completes message with failing, produces RLF.This moment, UE still used the configuration of cell-of-origin, and therefore, the id information that carries in the RRC connection reconstruction request that source eNB receives remains cell-of-origin UE ID, cell-of-origin ID.Adopt the first detection method can determine that equally this too early handover event is the first too early handover event.
The second detection method can be for detection of the third form of the first too early handover event, and the second too early handover event:
(1) for the second too early handover event.
Need to prove, in the second too early handover event, the UE successful switch has arrived Target cell, produced RLF in short time, after the second too early handover event occurs, the UE ID that carries in the RRC connection reconstruction request that source eNB receives is Target cell UE ID, and residential quarter ID is Target cell ID, and the reconstruction cause information is: RLF information.
Further, in the second too early handover event, because UE successfully switches to Target cell, target eNB sends UE context release message to source eNB, causes switching timer to start, and source eNB has discharged the UE contextual information that source eNB distributes.In order to make source eNB can judge still in such cases whether UE too early handover event has occured, safeguarded in the source eNB of the present embodiment that switches a recorded information, be used for preserving the switching state of UE, comprised the information such as duration value (these information are all that target eNB sends over) of Target cell UE ID and Target cell ID and/or switching timer in this switching recorded information.Particularly, the maintaining method of this switching recorded information will describe in subsequent embodiment.
After handover event occured too early, UE sent the request of RRC connection reconstruction to source eNB, carried Target cell UE ID, Target cell ID in this RRC connection reconstruction request and rebuild cause information.Before switching timer starts and is overtime, after source eNB receives this RRC connection reconstruction request, at first determine that the reconstruction in this RRC connection reconstruction request is former because RLF information, then according to this Target cell ID and Target cell UEID, find out the switching recorded information of UE, this switch the relevant information of preserving UE in recorded information (such as: aforesaid switching target small area preparations etc.) and the information such as switching state of UE, this switching recorded information is used to indicate cell-of-origin that UE switches and the corresponding relation of Target cell.At last, source eNB determines that according to the switching recorded information that finds out too early handover event has occured UE between cell-of-origin and Target cell.At this moment, when source eNB receives the request of RRC connection reconstruction, switching timer is in and opens and not overtime state, and the reconstruction cause information in the request of RRC connection reconstruction is RLF information, determines that this too early handover event is the second too early handover event.
(2) for the third form of the first too early handover event.
UE successfully had been linked into Target cell before timer T304 is overtime, but sending RRC connection reprovision to Target cell completes message with failing, produces RLF.This moment, UE used the configuration of Target cell, and therefore, the id information that carries in the request of RRC connection reconstruction remains Target cell UE ID, Target cell ID.Switching timer is in the state of not opening when source eNB receives the request of RRC connection reconstruction, and the reconstruction in the request of RRC connection reconstruction is former because RLF information adopts the second detection method can determine that equally this too early handover event is the first too early handover event.
By the too early changing method of detection that the present embodiment provides, source eNB can detect whether too early handover event has occured.
Need to prove, too early handover event has occured in SON, UE need to send the request of RRC connection reconstruction to source eNB, and to trigger the flow process of the fast quick-recovery of Radio Link, the flow process of the fast quick-recovery of Radio Link that defines in the LTE system particularly can comprise:
111, UE according to alternative condition, reselects suitable residential quarter.
Wherein, this alternative condition is that the signal quality of UE selected residential quarter should satisfy the resident requirement of residential quarter: relay station received power (Relay station Received Power is hereinafter to be referred as RSRP) receives level value (Qrxlev greater than the minimum in the residential quarter min), i.e. RSRP＞Qrxlev minCell-of-origin and Target cell that this suitable residential quarter can partly be mentioned for above-described embodiment.
Further, when UE began to select suitable residential quarter, UE started the timer T311 of self, and this timer T311 is used for limiting the time that UE selects suitable cell.If before this timer T311 was overtime, UE found suitable residential quarter, carry out 112; Otherwise the wireless connections reconstruction failure, UE enters idle condition.
112, UE sends the request of RRC connection reconstruction to the suitable cell of selecting, and accesses selected residential quarter.
After UE chooses suitable residential quarter, UE will stop timer T311, start timer T301, and read the system information of the broadcast message of selected residential quarter.Wherein, this RRC connection reconstruction request can referring to the foregoing description of the present embodiment, repeat no more herein.This timer T301 is used for limiting UE and rebuilds the time that RRC connects.
113, the eNB of selected residential quarter accepts the RRC connection reconstruction request of UE, and returns to RRC connection reconstruction (as RRC Connection reestablishment) message to UE.
The RRC connection reconstruction request that sends as UE successfully arrives the selected residential quarter of UE, and has been ready to context (Context) information of UE in this residential quarter, and eNB accepts the RRC connection reconstruction request of UE, and returns to RRC connection reconstruction message to UE; Otherwise, the RRC connection reconstruction request of the eNB refusal UE of selected residential quarter, and return to RRC connection reconstruction refusal (as RRC Connection reestablishmentReject) message to UE.
Further, by above-mentioned explanation, can find out through after the RRC connection reconstruction, UE can rebuild successful residential quarter can be the residential quarter of cell-of-origin with the contextual information of the UE that is prepared in advance.
114, RRC connection reconstruction success.
After UE received the RRC connection reconstruction message that the eNB of selected residential quarter returns, UE stopped timer T301, successfully rebuilds to be connected with the RRC of selected residential quarter.
If what source eNB returned is RRC connection reconstruction refuse information, perhaps timer T301 overtime before, UE fails to receive the RRC connection reconstruction message that source eNB returns, RRC connection reconstruction failure, UE enters idle state.
further, when the failure of RRC connection reconstruction, after UE enters idle condition, the present embodiment provides the method that makes UE reconnect to the cell-of-origin, that is: (RRC rebuilds the cell ID that carries as last time with the reason of last Radio Link Failure and problem information to trigger UE by Non-Access Stratum, UE sign etc.) be carried at and send to network side (source eNB) in RRC connection request (as RRC Connection Request), notice is to the residential quarter of current connection, make the network side (source eNB) can be in the situation that do not receive UE RRC connection reconstruction request message, still have an opportunity to obtain RLF event or HOF event, thereby detect the generation of switching too early.
In the present embodiment, the switching recorded information that source eNB is corresponding according to UE is determined too early handover event occurs between UE and target eNB, has saved the Signalling exchange between source eNB and target eNB, has improved the service efficiency of wireless network resource.
The schematic flow sheet of the too early changing method of detection that Fig. 2 provides for the embodiment of the present invention two, the present embodiment is elaborated for the first detection method take above-described embodiment one as the basis.The first detection method of the present embodiment can be for detection of the first form and the second form of the first too early handover event, and two kinds of forms are specially:
The first form, UE successfully receives the switching command that source eNB sends, but before timer T304 is overtime, and UE fails to be linked into Target cell always, produces HOF;
The second form, UE successfully had been linked into Target cell before timer T304 is overtime, but sending RRC connection reprovision to Target cell completes message with failing, produces RLF.
Need to prove, when producing RLF in the second form, UE still uses the configuration of cell-of-origin, UE carries cell-of-origin UE ID and cell-of-origin ID in the RRC connection reconstruction request of source eNB transmission, due to this moment UE not successful switch in Target cell, therefore, still preserve the contextual information corresponding with cell-of-origin UEID and cell-of-origin ID in the eNB of source.
As shown in Figure 2, the present embodiment can comprise:
201, switching timer does not start, and source eNB successfully receives the RRC connection reconstruction request that UE sends, and carries cell-of-origin UE ID, cell-of-origin ID in this RRC connection reconstruction request and rebuilds cause information.
Wherein, the RRC connection reconstruction request during the request of RRC connection reconstruction can be described referring to the first detection method in above-described embodiment one repeats no more herein.In the present embodiment, after the first too early handover event occured, successful switch was not to target eNB for UE, and target eNB can not send UE context release message to source eNB, so this switching timer is in not starting state.
After producing RLF or HOF, when UE communicates the reconstruction of link, send the request of RRC connection reconstruction to source eNB, trigger source eNB detects in SON whether too early handover event occurs.
202, source eNB judges whether the reconstruction cause information that carries in the request of RRC connection reconstruction is RLF information or HOF information, if carry out 203; If not, process ends.
In 202, when source eNB determines the former because RLF information of the reconstruction of carrying in the request of RRC connection reconstruction or HOF information, can determine that too early handover event has occured UE, and carry out 203.
203, source eNB searches corresponding contextual information according to cell-of-origin UE ID and cell-of-origin ID.
The present embodiment is described for the method that the first form and the second form of the first too early handover event detects, therefore, the switching recorded information of the present embodiment is distributed and the UE contextual information preserved describes as example take source eNB, wherein, this contextual information is preserved the switching record of UE, is used to indicate cell-of-origin that UE switches and the corresponding relation of Target cell.
When obtaining corresponding contextual information, at first source eNB finds out the contextual information of UE according to cell-of-origin ID and cell-of-origin UE ID from the contextual information of cell-of-origin.
204, source eNB determines that according to the contextual information of UE the first too early handover event has occured UE between cell-of-origin and Target cell.
Further, because switching timer is in not starting state, and the reconstruction of carrying in the request of RRC connection reconstruction is former in RLF information or HOF information, and source eNB can determine that UE between corresponding cell-of-origin and Target cell, the first too early handover event is occuring according to the contextual information of UE.
In the present embodiment, the switching recorded information that source eNB is corresponding according to UE is determined too early handover event occurs between UE and target eNB, has saved the Signalling exchange between source eNB and target eNB, has improved the service efficiency of wireless network resource.
The schematic flow sheet of the too early changing method of detection that Fig. 3 provides for the embodiment of the present invention three, the present embodiment be take above-described embodiment one as the basis, describes the scene that adopts the second detection method that the third form of the first too early handover event is detected in detail.
need to prove, the third form of the first too early handover event and the difference of the second form in above-described embodiment two are, when RLF or HOF occur, UE uses the configuration of Target cell, carry Target cell ID and Target cell UE ID in the RRC connection reconstruction request of source eNB transmission, due to this moment UE not successful switch in Target cell, therefore, still preserve the contextual information that active eNB distributes to UE in the eNB of source, but this contextual information is not corresponding with Target cell ID or Target cell UE ID, source eNB can't get correct UE contextual information according to the Target cell ID that carries in the request of RRC connection reconstruction and Target cell UE ID.In this scene, safeguarding in the source eNB of the present embodiment has to switch a recorded information, record the switching state of UE in this switching recorded information, be used to indicate cell-of-origin that UE switches and the corresponding relation of Target cell, the information content passes to source eNB by target eNB.This switching recorded information is in switch overtime or receive RRC connection reconstruction that UE sends or RRC and connect when setting up request and discharge.
Particularly, source eNB safeguards that this switching recorded information method can comprise following three kinds of modes:
(1) complete in source eNB and target eNB and switch when preparing, by target eNB, Target cell UE ID and Target cell ID are carried at switching request response (Handover Request ACK) message and send to source eNB.After source eNB receives this handover request ack message, container in this handover request ack message is resolved, obtain the Target cell UE ID and the Target cell ID that carry in the container of this switching request response, at last this Target cell UE ID and Target cell ID are saved in the switching recorded information, the source eNB of making can find out the switching recorded information of the UE that too early handover event occurs.Can start this timer this moment.
Need to prove, after in prior art, source eNB receives this handover request ack message, the container in this handover request message is not resolved, but directly forward to UE with the form of switching command.By the container in this handover request ack message is resolved, can after source eNB has discharged the contextual information of UE, the switching state of UE be arranged still in the present embodiment.
Further, target eNB also can be carried above-mentioned information outside container, thereby this moment, source eNB obtained relevant information with regard to not needing to resolve container, directly obtained relevant information from handover request message.
(2) at the UE successful switch when the target eNB, by target eNB, Target cell UE ID and Target cell ID are carried in UE context release message and send to source eNB.After source eNB receives this UE context release message, the Target cell UE ID in this UE context release message and Target cell ID are saved in described switching recorded information; In this message, also can carry the timer value of Target cell appointment.Can start timer this moment.
(3) target eNB can be carried Target cell ID, Target cell UE ID, RLF information or HOF information by newly-increased message and come notification source eNB.
Source eNB can according to the demand of actual conditions, select above-mentioned three kinds of modes to safeguard the switching recorded information.
As shown in Figure 3, the present embodiment can comprise:
301, when switching timer does not start, source eNB receives the RRC connection reconstruction request that UE sends, and carries Target cell UE ID, Target cell ID in this RRC connection reconstruction request and rebuilds cause information.
Wherein, the RRC connection reconstruction request during the request of RRC connection reconstruction can be described referring to the second detection method in above-described embodiment one repeats no more herein.In the present embodiment, UE successfully is linked into target eNB, does not complete message but successfully send reprovision, and target eNB can not send UE context release message to source eNB, and the switching timer in the eNB of source remains on not starting state.
302, source eNB judges whether the reconstruction cause information that carries in the request of RRC connection reconstruction is RLF information or HOF information, if carry out 303; If not, process ends.
In 302, when source eNB determines the former because RLF information of the reconstruction of carrying in the request of RRC connection reconstruction or HOF information, can determine that too early handover event has occured UE, and carry out 303.
303, source eNB finds out corresponding switching recorded information according to Target cell UE ID and Target cell ID.
304, source eNB determines that according to the switching recorded information of UE the first too early handover event has occured UE between cell-of-origin and Target cell.
In the present embodiment, the switching recorded information that source eNB is corresponding according to UE is determined too early handover event occurs between UE and target eNB, has saved the Signalling exchange between source eNB and target eNB, has improved the service efficiency of wireless network resource.
further, on the basis of detecting too early handover event, the present embodiment sends to source eNB by target eNB with Target cell UE ID and Target cell ID, by source eNB, Target cell UE ID and Target cell ID are saved in the switching recorded information, the source eNB of making can safeguard that switches a recorded information, in the not corresponding situation of the contextual information that distributes in the eNB of source and safeguard and identification information in the request of RRC connection reconstruction, source eNB can further judge cell-of-origin and the Target cell that too early handover event occurs according to the switching recorded information of obtaining, MRO more accurately is optimized handoff parameter.
The schematic flow sheet of the too early changing method of detection that Fig. 4 provides for the embodiment of the present invention four, the present embodiment describes take above-described embodiment one as the basis scene that adopts the second detection method that the second too early handover event is detected in detail.
need to prove, for the second too early handover event, UE successful switch has arrived Target cell, source eNB has received the UE context release message that target eNB sends, and discharged according to the indication of this UE context release message the context message that source eNB distributes to UE, cause source eNB not detect whether too early handover event has occured, in order to address this problem, safeguarding in the source eNB of the present embodiment has to switch a recorded information, record the switching state of UE in this switching recorded information, this switching recorded information is in switch overtime or receive RRC connection reconstruction that UE sends or RRC and connect when setting up request and discharge.Wherein, the contextual information of this UE, switching recorded information, and source eNB safeguards that the method for this switching recorded information has been described in detail, and repeats no more herein in above-described embodiment three.
As shown in Figure 4, the present embodiment can comprise:
401, before switching timer starts and be overtime, source eNB receives RRC connection reconstruction or the RRC connection foundation request that UE sends, and carries Target cell UE ID, Target cell ID in this request and rebuilds cause information.
Wherein, the RRC connection reconstruction request during the request of RRC connection reconstruction can be described referring to the second detection method in above-described embodiment one repeats no more herein.In the present embodiment, the second too early handover event occurs, and the UE successful switch is to target eNB, and target eNB sends UE context release message to source eNB, so this switching timer is in starting state, but this moment, this switching timer was not yet overtime.
402, source eNB judges whether the reconstruction cause information that carries in the request of RRC connection reconstruction is RLF information or HOF information, if carry out 403; If not, process ends.
In 402, when source eNB determines the former because RLF information of the reconstruction of carrying in the request of RRC connection reconstruction or HOF information, can determine that too early handover event has occured UE, and carry out 303.
403, source eNB finds out corresponding switching recorded information according to Target cell UE ID and Target cell ID.
404, source eNB determines that according to the switching recorded information of UE the second too early handover event has occured UE between cell-of-origin and Target cell.
Particularly, start and not overtime state because switching timer is in, and the reconstruction of carrying in the request of RRC connection reconstruction is former because RLF information can determine that the second too early handover event has occured UE in handoff procedure.By the execution of this step, source eNB can determine that further UE between corresponding cell-of-origin and Target cell, the second too early handover event has occured according to the switching recorded information of UE.
The present embodiment is described for the second detection method, and the switching recorded information of the present embodiment has been described in detail in above-described embodiment one, repeats no more herein.
In the present embodiment, the switching recorded information that source eNB is corresponding according to UE is determined too early handover event occurs between UE and target eNB, has saved the Signalling exchange between source eNB and target eNB, has improved the service efficiency of wireless network resource.
Further, on the basis of detecting too early handover event, the present embodiment sends to source eNB by target eNB with Target cell UE ID and Target cell ID, by source eNB, Target cell UE ID and Target cell ID are saved in the switching recorded information, the source eNB of making can safeguard that switches a recorded information, after source eNB has discharged source eNB and has distributed to the contextual information of UE, source eNB can further judge cell-of-origin and the Target cell that too early handover event occurs according to the switching recorded information of obtaining, and is that MRO more accurately is optimized handoff parameter.
The architecture of base station schematic diagram that Fig. 5 provides for the embodiment of the present invention five, the base station 10 that the present embodiment provides can be used for realizing the method that detection that above-described embodiment 1-4 provides is switched too early.
As shown in Figure 5, the base station 10 of the present embodiment comprises: the first acquiring unit 11, second acquisition unit 12 and detecting unit 13.Wherein, the first acquiring unit 11 obtains the handover event information of user equipment (UE), and this handover event information comprises cell ID, UE sign and Radio Link Failure RLF information or handoff failure HOF information; Second acquisition unit 12 is according to the switching recorded information of this UE of handover event acquisition of information of above-mentioned UE, and the switching recorded information of this UE is preserved the switching state of this UE and cell-of-origin that this UE switches and the corresponding relation of Target cell; Detecting unit 13 determines that according to the switching recorded information of above-mentioned UE too early handover event occurs this UE between cell-of-origin and Target cell.
Alternatively, above-mentioned base station 10 can also comprise maintenance unit 14, is used for safeguarding the switching recorded information of above-mentioned UE.This maintenance unit 14 can further comprise acquisition module 140 and preserve module 141, wherein, obtains sign and the Target cell UE sign of Target cell the handover request ack message that acquisition module 140 sends from target BS or context release message; Preserving module 141 is saved in above-mentioned Target cell UE sign and Target Cell Identifier in the switching recorded information.
Particularly, above-mentioned acquisition module 140 can be further used for: the handover request ack message of receiving target base station transmission; Resolve this handover request ack message, obtain Target Cell Identifier and Target cell UE sign, perhaps resolve the container in this handover request ack message, obtain Target Cell Identifier and the Target cell UE sign of carrying in this container.Perhaps alternatively, above-mentioned acquisition module 140 can be further used for: the UE context release message of receiving target base station transmission, carry Target Cell Identifier and Target cell UE sign in this UE context release message.
Alternatively, above-mentioned the first acquiring unit 11 can be further used for: receive the request of radio resource control RRC connection reconstruction or RRC connection request that above-mentioned UE sends, carry above-mentioned handover event information in this RRC connection reconstruction request or RRC connection request.
Alternatively, above-mentioned base station also comprises: start unit 15, be used for maybe when receiving the UE context release message of target BS transmission, starting the switching timer that is associated with above-mentioned switching recorded information when receiving the handover request ack message of target BS transmission.
When above-mentioned start unit 15 does not start switching timer, above-mentioned detecting unit 13 is further used for, obtain contextual information corresponding to UE according to cell ID and UE sign, and determine that according to above-mentioned RLF information or HOF information and above-mentioned contextual information the first too early handover event occurs this UE between cell-of-origin and Target cell.Above-mentioned contextual information is used to indicate cell-of-origin that UE switches and the corresponding relation of Target cell; At this moment, switching recorded information is contextual information.
When above-mentioned start unit 15 starts switching timer, and before this switch overtime, above-mentioned detecting unit 13 is further used for, and determines that according to above-mentioned RLF information or HOF information and above-mentioned switching recorded information the second too early handover event occurs above-mentioned UE between cell-of-origin and Target cell.
The first above-mentioned too early handover event and second switches too early event as described in embodiment of the method, repeats no more herein.
The embodiment of the present invention also provides a kind of detection too early switched system, this system can be used for realizing the method that detection that above-described embodiment 1-4 provides is switched too early, this system comprises target BS and the source base station that subscriber equipment switches, and this source base station is above-mentioned base station in embodiment illustrated in fig. 5.
In the LTE system, the base station that above-described embodiment provides is eNB.
The base station that above-described embodiment provides and system, the switching recorded information that source eNB is corresponding according to UE is determined too early handover event occurs between UE and target eNB, has saved the Signalling exchange between source eNB and target eNB, has improved the service efficiency of wireless network resource.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be completed by the hardware that program command is correlated with, aforesaid program can be stored in a computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (17)

1. one kind is detected the method for switching too early, it is characterized in that, described method comprises:
Obtain the handover event information of user equipment (UE), described handover event information comprises cell ID, UE sign and Radio Link Failure RLF information or handoff failure HOF information;
According to the switching recorded information of the described UE of handover event acquisition of information of described UE, the switching recorded information of described UE is preserved the switching state of described UE and cell-of-origin that described UE switches and the corresponding relation of Target cell;
Determine that according to the switching recorded information of described UE too early handover event occurs described UE between described cell-of-origin and Target cell.
2. method according to claim 1, is characterized in that, described method also comprises: safeguard the switching recorded information of described UE, the switching recorded information of the described UE of described maintenance specifically comprises:
Obtain sign and the Target cell UE sign of Target cell the handover request ack message that sends from target BS or context release message;
Described Target cell UE sign and Target Cell Identifier are saved in described switching recorded information.
3. method according to claim 2, is characterized in that, described sign and the Target cell UE sign that obtains Target cell from the handover request ack message that target BS sends comprises:
The handover request ack message that the receiving target base station sends;
Resolve described handover request ack message, obtain described Target Cell Identifier and Target cell UE sign, perhaps, resolve the container in described handover request ack message, obtain described Target Cell Identifier and the Target cell UE sign of carrying in described container.
4. method according to claim 2, is characterized in that, described sign and the Target cell UE sign that obtains Target cell from the context release message that target BS sends comprises:
The UE context release message that the receiving target base station sends carries described Target Cell Identifier and Target cell UE sign in described UE context release message.
5. method according to claim 1, is characterized in that, the handover event information of the described UE of obtaining comprises:
Receive the request of radio resource control RRC connection reconstruction or RRC connection request that described UE sends, carry described handover event information in the request of described RRC connection reconstruction or RRC connection request.
6. method according to claim 1, is characterized in that, described method also comprises:
When receiving the handover request ack message of target BS transmission, start the switching timer that is associated with described switching recorded information; Perhaps
When receiving the UE context release message of target BS transmission, start the switching timer that is associated with described switching recorded information.
7. method according to claim 6, is characterized in that, described switching recorded information is contextual information; Describedly determine that according to described switching recorded information described UE too early handover event occurs comprises between described cell-of-origin and Target cell:
When described switching timer does not start, obtain contextual information corresponding to described UE according to described cell ID and UE sign, described contextual information is used to indicate cell-of-origin that described UE switches and the corresponding relation of Target cell;
Determine that according to described RLF information or HOF information and described contextual information the first too early handover event occurs described UE between described cell-of-origin and Target cell.
8. method according to claim 6, is characterized in that, describedly determines that according to described switching recorded information described UE too early handover event occurs comprises between described cell-of-origin and Target cell:
Before described switch overtime, determine that according to described RLF information or HOF information and described switching recorded information the second too early handover event occurs described UE between described cell-of-origin and Target cell.
9. a base station, is characterized in that, comprising:
The first acquiring unit, for the handover event information of obtaining user equipment (UE), described handover event information comprises cell ID, UE sign and Radio Link Failure RLF information or handoff failure HOF information;
Second acquisition unit is used for the switching recorded information according to the described UE of handover event acquisition of information of described UE, the switching state of the described UE of switching recorded information preservation of described UE and the cell-of-origin that described UE switches and the corresponding relation of Target cell; With
Detecting unit is used for determining that according to the switching recorded information of described UE too early handover event occurs described UE between described cell-of-origin and Target cell.
10. base station according to claim 9, is characterized in that, described base station also comprises:
Maintenance unit is for the switching recorded information of safeguarding described UE;
Described maintenance unit further comprises:
Acquisition module is used for the sign and the Target cell UE sign that obtain Target cell from handover request ack message or the context release message of target BS transmission; With
Logging modle is used for described Target cell UE sign and Target Cell Identifier are saved in described switching recorded information.
11. base station according to claim 10 is characterized in that, described acquisition module is further used for:
The handover request ack message that the receiving target base station sends;
Resolve described handover request ack message, obtain described Target Cell Identifier and Target cell UE sign, perhaps, resolve the container in described handover request ack message, obtain described Target Cell Identifier and the Target cell UE sign of carrying in described container.
12. base station according to claim 10 is characterized in that, described acquisition module is further used for: the UE context release message of receiving target base station transmission, carry described Target Cell Identifier and Target cell UE sign in described UE context release message.
13. base station according to claim 9, it is characterized in that, described the first acquiring unit is further used for: receive the request of radio resource control RRC connection reconstruction or RRC connection request that described UE sends, carry described handover event information in the request of described RRC connection reconstruction or RRC connection request.
14. base station according to claim 9 is characterized in that, described base station also comprises:
Start unit is used for maybe when receiving the UE context release message of target BS transmission, starting the switching timer that is associated with described switching recorded information when receiving the handover request ack message of target BS transmission.
15. base station according to claim 14 is characterized in that,
Described switching recorded information is contextual information;
Described detecting unit is further used for, when described start unit does not start described switching timer, obtain contextual information corresponding to described UE according to described cell ID and UE sign, described contextual information is used to indicate cell-of-origin that described UE switches and the corresponding relation of Target cell; Determine that according to described RLF information or HOF information and described contextual information the first too early handover event occurs described UE between described cell-of-origin and Target cell.
16. base station according to claim 14, it is characterized in that, described detecting unit is further used for, when described start unit starts described switching timer, and before described switch overtime, determine that according to described RLF information or HOF information and described switching recorded information the second too early handover event occurs described UE between described cell-of-origin and Target cell.
17. one kind is detected too early switched system, it is characterized in that, described system comprise that subscriber equipment switches target BS and source base station, described source base station is as the described base station of claim 9-16 any one.
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