WO2011000280A1 - 检测过早切换方法、基站及系统 - Google Patents

检测过早切换方法、基站及系统 Download PDF

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Publication number
WO2011000280A1
WO2011000280A1 PCT/CN2010/074456 CN2010074456W WO2011000280A1 WO 2011000280 A1 WO2011000280 A1 WO 2011000280A1 CN 2010074456 W CN2010074456 W CN 2010074456W WO 2011000280 A1 WO2011000280 A1 WO 2011000280A1
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Prior art keywords
handover
information
target cell
cell
base station
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PCT/CN2010/074456
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English (en)
French (fr)
Inventor
杨学君
彼得•莱格
王君
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华为技术有限公司
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Publication of WO2011000280A1 publication Critical patent/WO2011000280A1/zh

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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

Definitions

  • the present invention relates to the field of communications, and in particular, to detecting a premature handover method, a base station, and a system. Background technique
  • Self-organizing Network is flexible, self-organizing, scalable, and load-balanced.
  • Some standard organizations such as 3GPP and Wimax Forum, are actively introducing SON related technologies.
  • a generation of mobile communication standards is also a standard organization, such as 3GPP and Wimax Forum.
  • Mobility Robustness Optimization is an important part of SON. It guarantees mobile performance by automatically configuring and automatically adjusting mobility-related parameters, such as switching performance to achieve optimal goals.
  • the mobility related parameters include: a handover parameter and a cell reselection parameter.
  • the network detects and counts related events. Based on the relevant statistics, the network determines the parameters that need to be adjusted and how to adjust.
  • the related events mentioned here include: switching too late, switching too early, switching to the wrong cell, unnecessary switching, etc. Dynamically adjusting the switching parameters in the SON can control the occurrence rate of related events in the network within the target range, thereby improving system performance.
  • the premature handover event means that the handover from the source cell to the target cell occurs prematurely, and the user equipment (User Equipment, hereinafter referred to as UE) cannot successfully handover to the target cell, or is unstable after successful handover to the target cell.
  • a Radio Link Failure (RLF) occurs within the UE, and then the UE attempts to establish a wireless connection in the source cell again.
  • RLF Radio Link Failure
  • the RLF appears in a short time
  • the UE fails to successfully access the target cell during the handover process to generate a handover failure (HO Failure, referred to as HOF);
  • the UE fails to successfully send a Radio Resource Control (RRC) connection reconfiguration complete (eg, RRC Connection Reconfiguration Complete) message to generate an RLF; 4.
  • RRC Radio Resource Control
  • the prior art provides a method for detecting premature handover events based on a target base station. That is, the target base station acts as a detection entity, collects relevant information, and determines whether a premature handover event occurs.
  • the specific procedure is: in the process of the UE switching from the source base station to the target base station, if a premature handover event occurs between the UE and the target base station, the UE sends an RRC connection reestablishment request (such as an RRC Connection Reestablishment Request) message to the source base station, to Re-establish a wireless connection with the source base station.
  • an RRC connection reestablishment request such as an RRC Connection Reestablishment Request
  • the source base station sends the identity information of the UE to the target base station based on the reestablishment cause information (for example, the RLF information or the HOF information) carried in the RRC connection reestablishment request message, such as a cell radio network temporary identifier (CIR RNTI). ), the Physical Cell Indentity (hereinafter referred to as PCI), etc., notifying the target base station that a certain UE has switched from the source cell to the target cell, and then the ReNB occurs, and then the target base station determines that the UE is handed over from the source cell to the target cell. Whether a premature switching event has occurred and returns a judgment result to the source base station.
  • the reestablishment cause information for example, the RLF information or the HOF information
  • CIR RNTI cell radio network temporary identifier
  • PCI Physical Cell Indentity
  • the source base station needs to interact with the target base station to learn whether a premature handover event occurs, and the signaling interaction between the source base station and the target base station is increased, and the P network competes for low wireless network resources. Use efficiency. Summary of the invention
  • An aspect of the present invention provides a method for detecting a premature handover, including: acquiring handover event information of a user equipment UE, where the handover event information includes a cell identifier, a UE identifier, and further includes a radio link failure RLF information or a handover failure HOF information; Acquiring, according to the handover event information of the UE, the handover record information of the UE, where the handover record information of the UE saves a correspondence between a handover state of the UE and a source cell and a target cell where the UE is handed over; and determining, according to the handover record information of the UE The UE performs a premature handover event between the source cell and the target cell.
  • a base station including: a first acquiring unit, configured to acquire handover event information of a user equipment UE, where the handover event information includes a cell identifier, a UE identifier, and a radio link failure RLF information or handover
  • the second acquisition unit is configured to acquire, according to the handover event information of the UE, the handover record information of the UE, where the handover record information of the UE saves the handover state of the UE and the source cell and the target cell where the UE is handed over Correspondence relationship; and detection unit, And determining, according to the handover record information of the UE, that the UE has a premature handover event between the source cell and the target cell.
  • Still another aspect of the present invention provides a target base station and a source base station for detecting a premature handover system, including user equipment handover, wherein the source base station is the base station described above.
  • the source base station determines that a premature handover event occurs between the UE and the target base station according to the handover record information corresponding to the UE, thereby eliminating signaling interaction between the source base station and the target base station, and improving the wireless network resource. Use efficiency.
  • FIG. 1 is a schematic flowchart of a method for detecting premature handover according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart of a method for detecting premature handover according to Embodiment 2 of the present invention
  • FIG. 3 is a schematic flowchart of a method for detecting premature handover according to Embodiment 3 of the present invention
  • FIG. 4 is a schematic flowchart of a method for detecting premature handover according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic structural diagram of a base station according to Embodiment 5 of the present invention. detailed description
  • FIG. 1 is a schematic flowchart of a method for detecting premature handover according to Embodiment 1 of the present invention. As shown in Fig. 1, this embodiment may include the following.
  • the handover event information includes a cell identifier, a UE identifier, and a radio link failure RLF information or a handover failure HOF information.
  • the handover record information of the UE is obtained according to the handover event information of the UE, where the handover record information of the UE stores a correspondence between a handover state of the UE and a source cell and a target cell where the UE is handed over.
  • the method for detecting the premature handover may be applied to a system capable of implementing SON.
  • the following embodiments are described by using a Long Term Evolution (LTE) system as an example, but are not limited to the LTE system.
  • LTE Long Term Evolution
  • each eNB evolved-Node B, played
  • the incoming base station includes a plurality of cells, and the eNB assigns each cell a unique identification ID, which is called a cell ID to distinguish different cells.
  • the eNB to which the cell belongs will be assigned to the UE as a unique ID, which is called the UE ID.
  • the ID assigned by the source eNB to the source cell is referred to as the source cell ID
  • the ID assigned by the source eNB to the UE is referred to as the source cell UE ID
  • the ID assigned by the target eNB to the target cell is referred to as the target cell ID
  • the target eNB is allocated to the UE.
  • the ID is called the target cell UE ID.
  • the base station to which the target cell belongs is called a target base station (such as a target eNB), and the base station to which the source cell belongs is called a source base station (such as a source eNB).
  • the channel condition of the UE is changed.
  • the source eNB makes a handover decision according to the measurement report, determining that the UE is to be handed over to the target eNB, and the source eNB sends a handover request to the target eNB. (such as Handover Request) message to inform the target eNB to prepare for handover.
  • a handover request such as Handover Request
  • the handover request response (such as a Handover Request ACK) message is returned to the source eNB, where the handover request response message carries information such as the target cell ID and the target cell UE ID.
  • the source eNB After receiving the handover request response message, the source eNB saves the target cell ID and the identifier allocated by the target cell to the UE (ie, the target cell UE ID, such as C-RNTI), and maintains a handover record information.
  • the source eNB maintains a handover timer related to the handover record information of the UE, and the duration of the handover timer is a time limit for storing the handover record information.
  • the source cell sends a handover command (such as a Handover command) to the UE.
  • a handover command such as a Handover command
  • the UE disconnects from the source eNB, accesses and establishes RRC in the target eNB, and successfully switches to the target cell corresponding to the target cell ID.
  • the UE After the UE successfully switches to the target cell, that is, the target cell successfully sends the UE context Release to the source cell, if the radio link fails in a short period of time, the UE may cause a premature handover event between the source cell and the target cell.
  • the premature handover event is a handover failure event caused by RLF, HOF, etc. during handover of the UE from the source cell to the target cell before the handover timer expires.
  • the premature handover event can be divided into two types.
  • the source eNB detects the following two types of premature handover events as an example. Ming, but not limited to the following two types of premature switching events:
  • the first premature handover event that is, the UE does not successfully handover to the target cell, may include the following three forms:
  • the UE successfully receives the handover command sent by the source eNB, but before the timer T304 times out, the UE fails to access the target cell and generates a HOF.
  • the UE sends the source cell ID, the source cell UE ID (for example, C-RNTI) and the reestablishment reason information to the source eNB in the RRC connection reestablishment request to request reconnection to the source eNB. Due to the radio link, when the UE fails to successfully send the RRC connection reestablishment request message to the source eNB, causing the RRC connection reestablishment to fail, the UE enters the idle (Idle) mode, and the non-access stratum of the UE (Non - Acess) Stratum, hereinafter referred to as NAS, triggers RRC establishment.
  • NAS non-access stratum of the UE
  • the RRC connection setup request is used to report the HOF event and the RRC connection reestablishment failure event to the source cell again.
  • the RRC connection setup request includes: the source cell ID, the source cell UE ID, and the HOF event and the subsequent RRC connection reestablishment failure event.
  • the UE successfully accesses the target cell before the timer T304 times out, but fails to successfully send an RRC connection reconfiguration complete message to the target cell to generate an RLF.
  • the UE still uses the configuration of the source cell, and carries the source cell ID, the source cell UE ID (for example, C-RNTI), and the reestablishment reason information in the RRC connection reestablishment request to the source eNB.
  • the RRC setup message is triggered by the NAS of the UE, and the RLF event and the previous RRC connection reestablishment failure event are reported again through the RRC connection setup message.
  • the RRC connection setup message includes: the source cell ID and the source cell. UE ID, RLF event, and RRC connection reestablishment failure event of the source cell.
  • the third form is similar to the second form, except that when the RLF is generated, the UE uses the configuration of the target cell, and the RRC connection reestablishment request sent to the source eNB carries the target cell ID and the target cell UE ID (for example, C -RNTI) and reconstruction cause information.
  • the target cell ID for example, C -RNTI
  • the second premature handover event that is, the UE successfully switches to the target cell, but generates the RLF in a short time.
  • the UE transmits the target cell ID, the target cell UE ID (for example, C-RNTI) and the reestablishment reason information to the source eNB in the RRC connection reestablishment request to request reconnection to the source eNB.
  • the RRC setup message is triggered by the NAS of the UE.
  • the UE may first start the process of the radio link fast recovery, and implement the UE to reconstruct and the source after the handover fails. Wireless connection between eNBs. If the fast recovery process fails, the UE further triggers the NAS process to establish a wireless connection. The specific process will be explained in the following sections.
  • the source eNB receives the RRC connection reestablishment request or the RRC connection setup request sent by the UE, where the request carries the identification information and the reestablishment cause information (such as the RLF information and the HOF information).
  • the identifier information includes the identifier information and the cell ID information before the UE is reconstructed.
  • the identifier information before the UE is re-established may be the source cell UE ID, and the cell ID information may be the source cell ID or the target cell ID.
  • the source eNB When the source eNB detects that the reestablishment reason information is the RLF or the HOF, the source eNB acquires the handover record information corresponding to the UE according to the identifier information of the UE, where the handover record information stores the handover state of the UE, and can indicate the source cell where the handover occurs. Correspondence with the target cell. After the source eNB obtains the handover record information, it can determine, according to the handover record information, whether a premature handover event occurs between the source cell and the target cell, and if yes, the source eNB adds a premature handover event. Record; if no, the process ends.
  • the first detection method can be used to detect the first form and the second form of the first premature switching event:
  • the UE fails to successfully access the target cell, and the HOF is generated, after the first form of the first premature handover event occurs, the source
  • the identifier information carried in the RRC connection reestablishment or the RRC connection setup request received by the eNB includes: a source cell UE ID and a source cell ID, and the reestablishment reason information is: HOF information.
  • the target eNB when the UE successfully switches to the target cell, the target eNB sends a UE Context Release message to the source eNB to indicate that the source eNB releases the context information of the UE that is saved by itself.
  • the context information of the UE is saved with the handover state of the UE.
  • the handover record information acquired in the first detection method may be Context information assigned to the UE by the source cell.
  • the source eNB in this embodiment maintains a handover timer.
  • the source eNB When the source eNB receives the UE context release message sent by the target eNB, the source eNB starts the handover timer and releases the context message of the UE. If the source eNB does not receive the UE, The context release message does not start the handover timer. Usually, the source eNB also stores the context information of the UE.
  • the duration of the switching timer can be through an external interface (such as a Network Management System (NMS) or an Element Management System (EMS) through the northbound interface Itf-N or the southbound interface Itf-S)
  • NMS Network Management System
  • EMS Element Management System
  • the setting is made, and the duration value of the handover timer may be determined according to the length of time that the UE allowed to stay in the target cell in the premature handover event.
  • the UE sends an RRC connection reestablishment request to the source eNB, where the RRC connection reestablishment request carries the active cell UE ID, the source cell ID, and the reestablishment cause information.
  • the source eNB After receiving the RRC connection reestablishment request, the source eNB first determines that the reestablishment cause information in the RRC connection reestablishment request is RLF information or HOF information, and then, according to the source cell ID and the source cell UE ID, Locating the context information of the UE from the storage device of the UE, where the context information is related to information about the UE (for example, the foregoing handover target cell preparation, etc.) and the handover status of the UE, where the context information is used to indicate the UE. The correspondence between the source cell and the target cell where the handover occurs.
  • the source eNB determines, according to the found context information, that the UE has a premature handover event between the source cell and the target cell.
  • the source eNB receives the RRC connection reestablishment request, the handover timer is in the inactive state, and the reestablishment cause information in the RRC connection reestablishment request is the HOF information, determining that the premature handover event is the first premature handover event.
  • the UE Although the UE successfully accesses the target cell, it fails to successfully send an RRC connection reconfiguration complete message to the target cell, and generates an RLF. At this time, the UE still uses the configuration of the source cell. Therefore, the ID information carried in the RRC connection reestablishment request received by the source eNB is still the source cell UE ID and the source cell ID.
  • the first detection method can also be used to determine that the premature switching event is the first premature switching event.
  • the second detection method can be used to detect the third form of the first premature switching event, and the second premature switching event:
  • the UE successfully switches to the target cell, and the RLF is generated in a short time, and after the second premature handover event occurs, the RRC connection received by the source eNB is heavy.
  • the UE ID carried in the request is the target cell UE ID
  • the cell ID is the target cell ID
  • the reconstruction cause information is: RLF information.
  • the target eNB sends a UE context release message to the source eNB, causing the handover timer to be started, and the source eNB releases the UE context information allocated by the source eNB. .
  • the source eNB in this embodiment maintains a handover record information, which is used to save the handover state of the UE, and the handover record information includes Information such as the target cell UE ID and the target cell ID, and/or the duration value of the handover timer (these information are all sent by the target eNB). Specifically, the maintenance method of the handover record information will be described in the subsequent embodiments.
  • the UE sends an RRC connection reestablishment request to the source eNB, where the RRC connection reestablishment request carries the target cell UE ID, the target cell ID, and the reestablishment cause information.
  • the source eNB After receiving the RRC connection reestablishment request, the source eNB first determines that the reestablishment cause in the RRC connection reestablishment request is RLF information, and then searches for the UE according to the target cell ID and the target cell UE ID.
  • Switching record information which stores information about the UE (for example, the foregoing handover target cell preparation, etc.) and the handover state of the UE, where the handover record information is used to indicate the source cell and the target cell in which the UE has handover Correspondence.
  • the source eNB ⁇ finds the handover record information to determine that the UE has a premature handover event between the source cell and the target cell.
  • the switch timer is in the state of being turned on and not timed out, and the reestablishment reason information in the RRC connection reestablishment request is the RLF information, determining that the premature handover event is the second premature. Switch events.
  • the UE successfully accesses the target cell before the timer T304 times out, but fails to successfully send an RRC Connection Reconfiguration Complete message to the target cell to generate an RLF. At this time, the UE uses the configuration of the target cell. Therefore, the ID information carried in the RRC connection reestablishment request is still the target cell UE ID and the target cell ID.
  • the source eNB receives the RRC connection reestablishment request, the handover timer is not enabled, and the reestablishment cause in the RRC connection reestablishment request is RLF information, and the second detection method can also determine that the premature handover event is the first An early switching event.
  • the source eNB can detect whether a premature handover event has occurred. It should be noted that, when a premature handover event occurs in the SON, the UE needs to send an RRC connection reestablishment request to the source eNB to trigger a fast recovery procedure of the radio link, specifically, the radio link defined in the LTE system is quickly recovered.
  • the process can include the following.
  • the UE reselects a suitable cell according to the selection condition.
  • the selection condition is that the signal quality of the cell selected by the UE should meet the camping requirement of the cell: the relay station received power (hereinafter referred to as RSRP) is greater than the minimum receiving level value (Qrxlev min ) in the cell, that is, RSRP. > Qrxlev min .
  • the suitable cell may be the source cell and the target cell mentioned in the foregoing embodiment.
  • the UE when the UE starts to select a suitable cell, the UE starts its own timer T311, which is used to limit the time when the UE selects a suitable cell. If the UE finds a suitable cell before the timer T311 times out, it performs 112; otherwise, the wireless connection reestablishment fails, and the UE enters an idle state.
  • the UE sends an RRC connection reestablishment request to the selected suitable cell to access the selected cell.
  • the UE After the UE selects the appropriate cell, the UE stops the timer T311, starts the timer T301, and reads the system information of the broadcast information of the selected cell.
  • the timer T301 is used to limit the time when the UE reestablishes the RRC connection.
  • the eNB of the selected cell accepts the RRC connection reestablishment request of the UE, and returns an RRC connection reestablishment (such as an RRC Connection reestablishment) message to the UE.
  • RRC connection reestablishment such as an RRC Connection reestablishment
  • the eNB accepts the RRC connection reestablishment request of the UE, and returns an RRC connection reestablishment message to the UE; Otherwise, the eNB of the selected cell rejects the RRC connection reestablishment request of the UE, and returns an RRC Connection Reestablishment Reject (such as RRC Connection Reestablishment Reject) message to the UE.
  • RRC Connection Reestablishment Reject such as RRC Connection Reestablishment Reject
  • the cell that can be successfully reconstructed by the UE after the RRC connection is reestablished may be the source cell and the cell in which the UE's context information is prepared in advance.
  • the RRC connection is successfully reconstructed.
  • the UE After receiving the RRC connection reestablishment message returned by the eNB of the selected cell, the UE stops the timer T301 and successfully reestablishes the RRC connection with the selected cell.
  • the source eNB If the source eNB returns an RRC connection reestablishment reject message, or before the timer T301 times out, If the UE fails to receive the RRC connection reestablishment message returned by the source eNB, the RRC connection reestablishment fails, and the UE enters an idle state.
  • the embodiment provides a method for reconnecting the UE to the source cell, that is, the reason and problem that the UE fails the last radio link failure triggered by the non-access stratum
  • the information (such as the cell identifier, the UE identity, and the like carried in the RRC re-establishment) is carried in the RRC connection request (such as the RRC Connection Request), and is sent to the network side (source eNB) to notify the currently connected cell, so that the network side (source eNB) It is possible to obtain an RLF event or an HOF event without receiving the UE RRC Connection Reestablishment Request message, thereby detecting the occurrence of a premature handover.
  • the source eNB determines that a premature handover event occurs between the UE and the target eNB according to the handover record information corresponding to the UE, thereby eliminating signaling interaction between the source eNB and the target eNB, and improving the use of the wireless network resource. effectiveness.
  • FIG. 2 is a schematic flowchart of a method for detecting premature switching according to Embodiment 2 of the present invention. This embodiment is described in detail with reference to the first embodiment.
  • the first detection method of this embodiment may be used to detect the first form and the second form of the first premature handover event, and the two forms are specifically:
  • the UE successfully receives the handover command sent by the source eNB, but before the timer T304 times out, the UE fails to access the target cell to generate the HOF;
  • the UE successfully accesses the target cell before the timer T304 times out, but fails to successfully send an RRC connection reconfiguration complete message to the target cell to generate an RLF.
  • the UE when the RLF is generated in the second form, the UE still uses the configuration of the source cell, and the RRC connection reestablishment request sent by the UE to the source eNB carries the source cell UE ID and the source cell ID, because the UE does not The handover to the target cell is successful. Therefore, the source eNB still stores context information corresponding to the source cell UE ID and the source and area ID.
  • this embodiment may include the following.
  • the handover timer is not started, and the source eNB successfully receives the RRC connection reestablishment request sent by the UE, where the RRC connection reestablishment request carries the active cell UE ID, the source cell ID, and the reestablishment reason information.
  • the first premature handover event is sent. After the lifetime, the UE does not successfully handover to the target eNB, and the target eNB does not send the UE context release message to the source eNB, so the handover timer is in an inactive state.
  • the UE After the RLF or the HOF is generated, when the UE performs the reestablishment of the communication link, the UE sends an RRC connection reestablishment request to the source eNB, and the trigger source eNB detects whether a premature handover event occurs in the SON.
  • the source eNB determines whether the reestablishment cause information carried in the RRC connection reestablishment request is RLF information or HOF information, and if yes, executes 203; if not, ends the process.
  • the source eNB determines that the reestablishment reason carried in the RRC connection reestablishment request is RLF information or HOF information, it may be determined that the UE has a premature handover event, and performs 203.
  • the source eNB searches for corresponding context information according to the source cell UE ID and the source cell ID.
  • the method for detecting the first type and the second form of the first premature handover event is described in this embodiment. Therefore, the handover record information in this embodiment is described by taking the UE context information allocated and saved by the source eNB as an example.
  • the context information is stored with a handover record of the UE, and is used to indicate a correspondence between the source cell and the target cell where the handover occurs.
  • the source eNB When obtaining the context information, the source eNB first searches for the context information of the UE from the context information of the source cell according to the source cell ID and the source cell UE ID.
  • the source eNB determines, according to the context information of the UE, that the UE has a first premature handover event between the source cell and the target cell.
  • the source eNB can determine, according to the context information of the UE, that the UE is in the corresponding source cell and the target cell, because the handover timer is in the initiating state, and the reestablishment reason carried in the RRC connection reestablishment request is the RLF information or the HOF information. The first premature switching event occurred between the two.
  • the source eNB determines that a premature handover event occurs between the UE and the target eNB according to the handover record information corresponding to the UE, thereby eliminating signaling interaction between the source eNB and the target eNB, and improving the use of the wireless network resource. effectiveness.
  • FIG. 3 is a schematic flowchart of a method for detecting premature switching according to Embodiment 3 of the present invention. This embodiment is based on the foregoing Embodiment 1 and details a third method for using the second detecting method for the first premature switching event. The scene in which the form is detected.
  • the third form of the first premature handover event is different from the second version in the second embodiment in that, when the RLF or the HOF occurs, the UE uses the configuration of the target cell to send the RRC to the source eNB.
  • the connection reestablishment request carries the target cell ID and the target cell UE ID, because The UE does not successfully switch to the target cell. Therefore, the source eNB still stores the context information allocated by the active eNB to the UE, but the context information does not correspond to the target cell ID or the target cell UE ID, and the source eNB cannot reestablish the request according to the RRC connection.
  • the target cell ID and the target cell UE ID carried in the network acquire the correct UE context information.
  • the source eNB in this embodiment maintains a switch record information, where the switch record information records the handover state of the UE, and is used to indicate the correspondence between the source cell and the target cell where the UE is handed over, and the information content. It is delivered by the target eNB to the source eNB.
  • the handover record information is released when the handover timer expires or receives an RRC connection reestablishment or an RRC connection setup request sent by the UE.
  • the method for the source eNB to maintain the handover record information may include the following three methods:
  • the target eNB When the source eNB completes the handover preparation with the target eNB, the target eNB carries the target cell UE ID and the target cell ID in a Handover Request ACK message to the source eNB. After receiving the handover request response message, the source eNB parses the container in the handover request response message, obtains the target cell UE ID and the target cell ID carried in the container of the handover request response, and finally the target cell UE ID and The target cell ID is saved in the handover record information, so that the source eNB can find the handover record information of the UE that has a premature handover event. This timer can be started at this time.
  • the source eNB after receiving the handover request response message, the source eNB does not parse the container in the handover request message, but directly forwards the packet to the UE in the form of a handover command.
  • the source eNB by analyzing the container in the handover request response message, after the source eNB releases the context information of the UE, there is still a handover state of the UE.
  • the target eNB may also carry the foregoing information outside the container.
  • the source eNB does not need to parse the container to obtain related information, and directly obtains related information from the handover request message.
  • the target eNB When the UE successfully switches to the target eNB, the target eNB carries the target cell UE ID and the target cell ID in the UE context release message to the source eNB. After receiving the UE context release message, the source eNB saves the target cell UE ID and the target cell ID in the UE context release message to the handover record information.
  • the target cell may also be configured to carry the timer specified by the target cell. value. The timer can be started at this time.
  • the target eNB may notify the source eNB by adding a target cell ID, a target cell UE ID, RLF information, or HOF information.
  • the source eNB can select the above three methods to maintain the switching record according to the actual situation. As shown in FIG. 3, this embodiment may include the following.
  • the source eNB receives the RRC connection reestablishment request sent by the UE, where the RRC connection reestablishment request carries the target cell UE ID, the target cell ID, and the reestablishment reason information.
  • the RRC connection reestablishment request refer to the RRC connection reestablishment request in the description of the second detection method in the first embodiment, and details are not described herein again.
  • the target eNB does not send the UE context release message to the source eNB, and the handover timer in the source eNB remains in the inactive state.
  • the source eNB determines whether the reestablishment cause information carried in the RRC connection reestablishment request is RLF information or HOF information, and if yes, executes 303; if not, ends the process.
  • the source eNB determines that the reestablishment reason carried in the RRC connection reestablishment request is RLF information or HOF information, it may be determined that the UE has a premature handover event, and performs 303.
  • the source eNB is located in the target cell, and the UE ID and the target cell ID are used to find a corresponding handover record.
  • the source eNB determines, according to the handover record information of the UE, that the UE generates a first premature handover event between the source cell and the target cell.
  • the source eNB determines that a premature handover event occurs between the UE and the target eNB according to the handover record information corresponding to the UE, thereby eliminating signaling interaction between the source eNB and the target eNB, and improving the use of the wireless network resource. effectiveness.
  • the embodiment sends the target cell UE ID and the target cell ID to the source eNB by the target eNB, and the source eNB saves the target cell UE ID and the target cell ID to the handover record.
  • the source eNB can maintain a handover record information, and if the context information allocated and maintained in the source eNB does not correspond to the identifier information in the RRC connection reestablishment request, the source eNB can further determine according to the obtained handover record information. The source cell and the target cell of the premature handover event occur, so that the MRO can optimize the handover parameters more accurately.
  • FIG. 4 is a schematic flowchart of a method for detecting a premature handover according to Embodiment 4 of the present invention.
  • a scenario for detecting a second premature handover event by using a second detection method is described in detail. .
  • the source eNB has received the UE context release message sent by the target eNB, and releases the context message allocated by the source eNB to the UE according to the indication of the UE context release message, so that the source eNB cannot detect whether a premature handover event has occurred, in order to solve
  • the source eNB in this embodiment maintains a handover record information, where the handover record information records the handover state of the UE, and the handover record information expires in the handover timer or receives the RRC connection reestablishment or RRC sent by the UE. Released when the connection is established.
  • the context information of the UE, the handover record information, and the method for the source eNB to maintain the handover record information have been described in detail in the foregoing Embodiment 3, and details are not described herein again.
  • this embodiment may include the following.
  • the source eNB receives an RRC connection reestablishment or an RRC connection setup request sent by the UE, where the request carries the target cell UE ID, the target cell ID, and the reestablishment cause information.
  • the second premature handover event occurs, and the UE successfully switches to the target eNB, and the target eNB sends a UE context release message to the source eNB, so the handover timer is in the startup state, but the handover timer has not expired yet. .
  • the source eNB determines whether the reestablishment cause information carried in the RRC connection reestablishment request is RLF information or HOF information, and if yes, executes 403; if not, the process ends.
  • the source eNB determines that the reestablishment reason carried in the RRC connection reestablishment request is RLF information or HOF information, it may be determined that the UE has a premature handover event, and performs 303.
  • the source eNB is located in the target cell, and the UE ID and the target cell ID are used to find a corresponding handover record.
  • the source eNB determines, according to the handover record information of the UE, that the UE generates a second premature handover event between the source cell and the target cell.
  • the source eNB can further determine, according to the handover record information of the UE, that the UE has a second premature handover event between the corresponding source cell and the target cell.
  • This embodiment describes the second detection method.
  • the handover record information in this embodiment has been described in detail in the first embodiment, and details are not described herein again.
  • the source eNB determines that a premature handover event occurs between the UE and the target eNB according to the handover record information corresponding to the UE, thereby eliminating signaling interaction between the source eNB and the target eNB, and improving the use of the wireless network resource. effectiveness.
  • the present embodiment sends the target cell UE ID and the target cell ID to the source eNB by the target eNB, and the source eNB saves the target cell UE ID and the target cell ID to the handover record information.
  • the source eNB is configured to enable the source eNB to maintain a handover record information. After the source eNB releases the context information allocated by the source eNB to the UE, the source eNB can further determine, according to the obtained handover record information, the source cell and the target cell where the premature handover event occurs. , MRO optimizes the switching parameters more accurately.
  • FIG. 5 is a schematic structural diagram of a base station according to Embodiment 5 of the present invention.
  • the base station 10 provided in this embodiment may be used to implement the method for detecting premature handover provided by the foregoing Embodiment 1-4.
  • the base station 10 of this embodiment includes: a first acquiring unit 11, a second obtaining unit 12, and a detecting unit 13.
  • the first acquiring unit 11 acquires handover event information of the user equipment UE, where the handover event information includes a cell identifier, a UE identifier, and radio link failure RLF information or handover failure HOF information.
  • the second acquiring unit 12 performs handover according to the UE.
  • the event information acquires the handover record information of the UE, and the handover record information of the UE stores the handover state of the UE and the correspondence between the source cell and the target cell where the UE is handed over; the detecting unit 13 determines the UE according to the handover record information of the UE.
  • a premature handover event occurs between the source cell and the target cell.
  • the foregoing base station 10 may further include a maintenance unit 14 for maintaining handover record information of the UE.
  • the maintenance unit 14 may further include an obtaining module 140 and a saving module 141, where the obtaining module 140 obtains an identifier of the target cell and a target cell UE identifier from a handover request response message or a context release message sent by the target base station; The target cell UE identity and the target cell identity are saved in the handover record information.
  • the acquiring module 140 may be further configured to: receive a handover request response message sent by the target base station; parse the handover request response message, obtain the target cell identifier and the target cell UE identifier, or parse the container in the handover request response message, Obtaining a target cell identifier carried in the container and a target cell UE identifier.
  • the acquiring module 140 may be further configured to: receive a UE context release message sent by the target base station, where the UE context release message carries the target cell identifier and the target cell UE identifier.
  • the first acquiring unit 11 may be further configured to: receive a radio resource control RRC connection reestablishment request or an RRC connection request sent by the UE, where the RRC connection reestablishment request or the RRC connection request carries the handover event information.
  • the foregoing base station further includes: an initiating unit 15 configured to: when receiving the handover request response message sent by the target base station, or when receiving the UE context release message sent by the target base station, start to associate with the handover record information Switching timer.
  • an initiating unit 15 configured to: when receiving the handover request response message sent by the target base station, or when receiving the UE context release message sent by the target base station, start to associate with the handover record information Switching timer.
  • the detecting unit 13 is further configured to: acquire context information corresponding to the UE according to the cell identifier and the UE identifier, and determine, according to the RLF information or the HOF information and the context information, that the UE is A first premature handover event occurs between the source cell and the target cell.
  • the foregoing context information is used to indicate a correspondence between a source cell and a target cell where the UE has a handover; at this time, the handover record information is context information.
  • the detecting unit 13 is further configured to: determine that the UE occurs between the source cell and the target cell according to the RLF information or the HOF information and the foregoing handover record information, when the starting unit 15 starts the switching timer, and the switching timer expires. The second premature switching event.
  • the first premature handover event and the second handover premature event are as described in the method embodiment, and are not described herein again.
  • the embodiment of the present invention further provides a method for detecting a premature handover, where the system can be used to implement the method for detecting premature handover provided by the foregoing Embodiment 1-4, where the system includes a target base station and a source base station for user equipment handover, and the source base station It is the base station in the embodiment shown in FIG. 5 above.
  • the base station provided by the foregoing embodiment is an eNB.
  • the source eNB determines that a premature handover event occurs between the UE and the target eNB according to the handover record information corresponding to the UE, thereby eliminating signaling interaction between the source eNB and the target eNB, and improving the wireless The efficiency of the use of network resources.

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Description

检测过早切换方法、 基站及系统
本申请要求于 2009 年 6 月 29 日提交中国专利局、 申请号为 200910151041.X,发明名称为"检测过早切换方法、基站及系统"的中国专利申 请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域， 特别涉及检测过早切换方法、 基站及系统。 背景技术
自组织网络（ Self - Organizing Network, 以下简称 SON )具有灵活、 自组 织、可扩展性强和负载均衡等特点，一些标准组织，如 3GPP、 Wimax Forum等， 正积极地将 SON的相关技术引入下一代的移动通信标准。
移动性能优化 ( Mobility Robustness Optimization, 以下简称 MRO )是 SON 的一个重要内容， 它通过对移动性相关的参数自动配置和自动调整保证移动 性能， 如切换性能达到优化的目标。 其中， 移动性相关参数包括： 切换参数 和小区重选参数。
具体地， 网络检测相关事件并对其进行统计， 基于相关的统计量， 网络 确定需要调整的参数以及如何调整。 这里所说的相关事件包括： 切换过晚， 切换过早， 切换到错误小区， 不必要切换等。 动态地调整 SON中的切换参数， 能够将网络中相关事件的发生率控制在目标范围之内， 从而提高系统性能。
过早切换事件是指从源小区到目标小区的切换发生过早， 导致用户设备 ( User Equipment, 以下简称 UE )不能成功地切换到目标小区， 或者成功切换 到目标小区以后并不稳定， 短时间内发生无线链路失败（ Radio Link Failure, 以下简称 RLF ) ， 之后 UE试图重新在源小区建立无线连接。 具体地， 过早切 换事件的特征包括：
1、 UE在成功由源小区切换到目标小区以后， 短时间内出现 RLF;
2、 UE在切换过程中未能成功接入到目标小区产生切换失败（ HO Failure, 简称 HOF ) ；
3、 UE未能成功发送无线资源控制（Radio Resources Control, RRC )连接 重配置完成 (如 RRC Connection Reconfiguration Complete ) 消息产生 RLF; 4、 UE重建连接到源小区。
过早切换事件的检测对于 MRO来说至关重要。 现有技术提供基于目标基 站过早切换事件检测方法。 即目标基站作为检测实体， 收集相关信息， 并判 断是否发生过早切换事件。 具体流程为： 在 UE从源基站切换到目标基站的过 程中， UE与目标基站之间发生了过早切换事件， 则 UE向源基站发送 RRC连接 重建请求（如 RRC Connection Reestablishment Request ) 消息， 以重新建立与 源基站之间的无线连接。 源基站基于 RRC连接重建请求消息中携带的重建原 因信息（例如： RLF信息或者 HOF信息）， 向目标基站发送 UE的标识信息（如 小区无线网络临时标识（ CellRadio Network Temporary Identifier, 以下简称 C-RNTI )，物理小区标识（ Physical Cell Indentity, 以下简称 PCI )等） ， 通知 目标基站某个 UE从源小区切换到目标小区时发生了 RLF, 然后， 目标基站判 断该 UE从源小区切换到目标小区时是否发生了过早切换事件， 并向源基站返 回判断结果。
现有技术中， 源基站需要通过与目标基站之间的多次信息交互， 才能获 知是否发生过早切换事件， 增加了源基站和目标基站之间的信令交互， P争低 了无线网络资源的使用效率。 发明内容
本发明一方面提供了一种检测过早切换方法， 包括： 获取用户设备 UE的 切换事件信息， 该切换事件信息包括小区标识、 UE标识， 还包括无线链路失 败 RLF信息或切换失败 HOF信息； 根据上述 UE的切换事件信息获取上述 UE的 切换记录信息， 该 UE的切换记录信息保存上述 UE的切换状态和上述 UE发生 切换的源小区和目标小区的对应关系； 据上述 UE的切换记录信息确定上述 UE在所述源小区和目标小区之间发生过早切换事件。
本发明另一方面提供了一种基站， 包括： 第一获取单元， 用于获取用户 设备 UE的切换事件信息， 该切换事件信息包括小区标识、 UE标识， 还包括无 线链路失败 RLF信息或切换失败 HOF信息； 第二获取单元， 用于根据上述 UE 的切换事件信息获取该 UE的切换记录信息， 该 UE的切换记录信息保存该 UE 的切换状态和该 UE发生切换的源小区和目标小区的对应关系； 和检测单元， 用于根据上述 UE的切换记录信息确定该 UE在源小区和目标小区之间发生过 早切换事件。
本发明再一方面还提供一种检测过早切换系统， 包括用户设备切换的目 标基站和源基站， 其中源基站为以上所述的基站。
由上述技术方案可知， 源基站根据 UE对应的切换记录信息， 确定 UE与目 标基站之间发生过早切换事件， 省去了源基站与目标基站之间的信令交互， 提高了无线网络资源的使用效率。 附图说明
图 1为本发明实施例一提供的检测过早切换的方法流程示意图；
图 2为本发明实施例二提供的检测过早切换的方法流程示意图；
图 3为本发明实施例三提供的检测过早切换的方法流程示意图；
图 4为本发明实施例四提供的检测过早切换的方法流程示意图；
图 5为本发明实施例五提供的基站结构示意图。 具体实施方式
下面结合附图对本发明的具体实施例作进一步详细的说明。
图 1为本发明实施例一提供的检测过早切换方法的流程示意图。 如图 1所 示， 本实施例可以包括以下内容。
101、 获取用户设备 UE的切换事件信息， 该切换事件信息包括小区标识、 UE标识、 以及无线链路失败 RLF信息或切换失败 HOF信息。
102、 根据上述 UE的切换事件信息获取该 UE的切换记录信息， 该 UE的切 换记录信息保存上述 UE的切换状态和上述 UE发生切换的源小区和目标小区 的对应关系。
103、 根据上述 UE的切换记录信息确定上述 UE在所述源小区和目标小区 之间发生过早切换事件。
本实施例提供的检测过早切换方法可以应用到能够实现 SON的系统中， 以下各实施例以长期演进（ Long Term Evolution, 以下简称 LTE ) 系统为例进 行说明， 但不限于 LTE系统。 在 LTE系统中， 每个 eNB ( evolved-Node B， 演 进基站）包括多个小区， eNB为每个小区分配唯一的标识 ID,该 ID称为小区 ID, 以区分不同的小区。 当某个小区服务于 UE时， 该小区所属的 eNB将分配给该 UE—个唯一的 ID, 该 ID称为 UE ID。 其中， 源 eNB分配给源小区的 ID称为源 小区 ID, 源 eNB分配给 UE的 ID称为源小区 UE ID, 目标 eNB分配给目标小区的 ID称为目标小区 ID, 目标 eNB分配给 UE的 ID称为目标小区 UE ID。 目标小区 所属的基站称为目标基站（如目标 eNB )， 源小区所属的基站称为源基站（如 源 eNB ) 。
本实施例中， 当 UE从源 eNB中的源小区移动到目标 eNB中的目标小区时， 导致 UE的信道条件发生了改变。 在 UE对目标 eNB的信道条件进行测量后， 向 源 eNB发送测量报告； 然后， 源 eNB根据该测量报告做出切换判决， 确定 UE 要切换到目标 eNB中， 则源 eNB向目标 eNB发送切换请求 （如 Handover Request )消息，以通知目标 eNB做好切换准备。当目标 eNB准备好进行切换后， 向源 eNB返回切换请求响应（如 Handover Request ACK )消息， 该切换请求响 应消息中携带有目标小区 ID和目标小区 UE ID等信息。 源 eNB接收到该切换请 求响应消息后， 保存其中的目标小区 ID以及目标小区为 UE分配的标识（即目 标小区 UE ID, 如 C - RNTI ) ， 并维护一个切换记录信息。 源 eNB中维护有一 个与该 UE的切换记录信息相关的切换定时器， 该切换定时器的时长为保存该 切换记录信息的时限。 与此同时， 源小区向 UE发送切换命令（如 Handover command ) 。 UE接收到该切换命令后， 断开与源 eNB的连接， 在目标 eNB接 入并建立 RRC, 成功切换到目标小区 ID对应的目标小区中。
当 UE成功切换到目标小区以后， 即目标小区成功地发送 UE context Release给源小区， 如果短时间内产生无线链路失败， 则会导致 UE在源小区和 目标小区之间发生过早切换事件。
在 LTE系统中， 如果切换参数配置不合理时， 将会发生过早切换事件， 使 得 UE无法成功地切换到目标 eNB。 其中， 过早切换事件为在切换定时器超时 前， UE从源小区切换到目标小区的过程中由于 RLF、 HOF等原因导致的切换 失败事件。
根据 UE是否成功切换到目标小区， 可以将过早切换事件划分两种类型。 本实施例中， 以源 eNB对下述两种类型的过早切换事件进行检测为例进行说 明， 但不限于下述两种类型的过早切换事件：
第一过早切换事件， 即 UE没有成功切换到目标小区， 可以包括以下三种 形式：
第一种形式， UE成功地接收到源 eNB发送的切换命令， 但在定时器 T304 超时之前， UE—直未能接入到目标小区， 产生 HOF。
此时 UE将源小区 ID、 源小区 UE ID (例如 C-RNTI )和重建原因信息携带 在 RRC连接重建请求中向源 eNB发送， 以请求重新连接到源 eNB。 由于无线链 路的原因，当 UE未能成功地将 RRC连接重建请求消息发送到源 eNB,导致 RRC 连接重建失败后， UE进入空闲 （Idle )模式， 由 UE的非接入层（Non - Acess Stratum, 以下简称 NAS )触发 RRC建立。 通过 RRC连接建立请求， 再次向源 小区报告 HOF事件以及 RRC连接重建失败事件， 此时 RRC连接建立请求中包 括： 源小区 ID,源小区 UE ID, 以及 HOF事件以及之后 RRC连接重建失败事件。
第二种形式， UE在定时器 T304超时之前， 成功地接入到了目标小区， 但 是未能成功地向目标小区发送 RRC连接重配完成 （ RRC connection reconfiguration complete ) 消息， 产生 RLF。 此时 UE仍然使用源小区的配置， 并将源小区 ID、 源小区 UE ID (例如 C-RNTI )和重建原因信息携带在 RRC连 接重建请求中向源 eNB发送。 当 RRC重建失败时， 由 UE的 NAS触发 RRC建立 消息，并通过 RRC连接建立消息再次上报 RLF事件以及之前的 RRC连接重建失 败事件， 此时的 RRC连接建立消息中包括： 源小区 ID、 源小区 UE ID、 RLF事 件， 以及源小区的 RRC连接重建失败事件。
第三种形式， 与第二种形式类似， 不同之处在于产生 RLF时， UE使用目 标小区的配置， 向源 eNB发送的 RRC连接重建请求中携带有目标小区 ID、 目标 小区 UE ID (例如 C-RNTI )和重建原因信息。
第二过早切换事件， 即 UE成功地切换到了目标小区， 但在短时间内产生 RLF。 此时 UE将目标小区 ID、 目标小区 UE ID (例如 C-RNTI )和重建原因信 息携带在 RRC连接重建请求中向源 eNB发送， 以请求重新连接到源 eNB。 当 RRC重建失败时， 由 UE的 NAS触发 RRC建立消息。
本实施例中， 为了在过早切换事件发生后， 减小切换中业务中断时间， UE可以首先启动无线链路快速恢复的流程， 实现 UE在切换失败后重建与源 eNB之间的无线连接。 如果快速恢复流程失败， UE进一步触发 NAS过程建立 无线连接。 具体的流程将在后续部分进行说明。
在切换定时器超时前， 源 eNB接收到 UE发送的 RRC连接重建请求或者 RRC连接建立请求， 上述请求中携带标识信息和重建原因信息（如 RLF信息、 HOF信息）。 该标识信息包括 UE重建前的标识信息和小区 ID信息， 该 UE重建 前的标识信息可以为源小区 UE ID,该小区 ID信息可以为源小区 ID或目标小区 ID。 当源 eNB检测到该重建原因信息为 RLF或 HOF时，源 eNB根据 UE的标识信 息获取该 UE对应的切换记录信息， 该切换记录信息保存有 UE的切换状态， 能 够指示 UE发生切换的源小区和目标小区的对应关系。 当源 eNB获取到该切换 记录信息后， 能够根据该切换记录信息判断出 UE在所述源小区和目标小区之 间是否发生了过早切换事件， 若是， 则源 eNB增加一次过早切换事件的记录； 若否， 则结束流程。
需要说明的是， 上述的过早切换事件发生后， RRC连接重建请求中携带 的标识信息和重建原因信息各不相同，相应地源 eNB获取的切换记录信息也不 相同， 因此， 本实施例针对上述不同类型的过早切换事件， 提供了以下两种 不同的检测方法：
第一种检测方法， 可以用于检测第一过早切换事件的第一种形式和第二 种形式：
( 1 )对于第一过早切换事件的第一种形式。
需要说明的是， 在第一过早切换事件的第一种形式中， UE未能成功接入 到目标小区， 产生了 HOF， 则在第一过早切换事件的第一种形式发生后， 源 eNB接收到的 RRC连接重建或者 RRC连接建立请求中携带的标识信息包括：源 小区 UE ID和源小区 ID, 重建原因信息为： HOF信息。
进一步地， 在 LTE系统中， 当 UE成功切换到目标小区时， 目标 eNB向源 eNB发送 UE上下文释放 ( UE Context Release ) 消息， 以指示源 eNB释放自身 保存的 UE的上下文（Context )信息。 其中， UE的上下文信息保存有 UE的切 换状态。 由于在第一过早切换事件的第一种形式中， UE并未成功切换到目标 小区， 源 eNB中仍然保存有 UE的上下文信息， 因此， 第一种检测方法中所获 取的切换记录信息可以为源小区为 UE分配的上下文信息。 本实施例的源 eNB中维护有一个切换定时器， 当源 eNB接收到目标 eNB发 送的 UE上下文释放消息时， 启动该切换定时器， 并释放该 UE的上下文消息； 若源 eNB未接收到 UE上下文释放消息， 则不启动该切换定时器， 通常源 eNB 中还保存有 UE的上下文信息。 该切换定时器的时长可以通过外部接口 （例如 网络管理系统（ Network Management System, 以下简称 NMS ) 、 网元管理系 统（ Element Management System, EMS )通过北向接口 Itf-N或南向接口 Itf-S ) 进行设置， 该切换定时器的时长值可以根据允许在过早切换事件中的 UE在目 标小区中停留的时间长短来确定。
由上述说明可知， 过早切换事件发生后， UE向源 eNB发送 RRC连接重建 请求，该 RRC连接重建请求中携带有源小区 UE ID、源小区 ID和重建原因信息。 在切换定时器未启动时， 源 eNB接收到该 RRC连接重建请求后， 首先确定该 RRC连接重建请求中的重建原因信息为 RLF信息或 HOF信息，然后根据该源小 区 ID及源小区 UE ID, 从自身的存储设备中查找出该 UE的上下文信息， 该上 下文信息中保存有 UE的相关信息（例如： 前述的切换目标小区准备等）和 UE 的切换状态等信息， 该上下文信息用于指示 UE发生切换的源小区和目标小区 的对应关系。 最后， 源 eNB根据查找出的上下文信息确定 UE在源小区和目标 小区之间发生了过早切换事件。此时， 源 eNB接收到 RRC连接重建请求时切换 定时器处于未启动状态， 且 RRC连接重建请求中的重建原因信息为 HOF信息， 则确定本次过早切换事件为第一过早切换事件。
( 2 )对于第一过早切换事件的第二种形式。
UE虽然成功地接入到了目标小区， 但是未能成功地向目标小区发送 RRC 连接重配完成消息， 产生 RLF。 此时 UE仍然使用源小区的配置， 因此， 源 eNB 接收到的 RRC连接重建请求中携带的 ID信息仍然是源小区 UE ID、 源小区 ID。 采用第一种检测方法同样能够确定本次过早切换事件为第一过早切换事件。
第二种检测方法， 可以用于检测第一过早切换事件的第三种形式， 以及 第二过早切换事件：
( 1 )对于第二过早切换事件。
需要说明的是， 在第二过早切换事件中， UE成功切换到了目标小区， 短 时间内产生了 RLF, 则第二过早切换事件发生后， 源 eNB接收到的 RRC连接重 建请求中携带的 UE ID为目标小区 UE ID, 小区 ID为目标小区 ID, 且重建原因 信息为： RLF信息。
进一步地， 在第二过早切换事件中， 由于 UE成功地切换到目标小区， 目 标 eNB向源 eNB发送 UE上下文释放消息，导致切换定时器启动，且源 eNB释放 了源 eNB分配的 UE上下文信息。 为了使源 eNB在此种情况下仍然能够判断 UE 是否发生了过早切换事件，本实施例的源 eNB中维护了一个切换记录信息，用 于保存 UE的切换状态， 该切换记录信息中包含了目标小区 UE ID和目标小区 ID、 和 /或切换定时器的时长值等信息（这些信息都是目标 eNB发送过来的）。 具体地， 该切换记录信息的维护方法将在后续实施例中进行说明。
过早切换事件发生后， UE向源 eNB发送 RRC连接重建请求， 该 RRC连接 重建请求中携带有目标小区 UE ID、 目标小区 ID和重建原因信息。 在切换定时 器启动且超时前， 源 eNB接收到该 RRC连接重建请求后， 首先确定该 RRC连接 重建请求中的重建原因为 RLF信息， 然后根据该目标小区 ID及目标小区 UE ID,查找出 UE的切换记录信息，该切换记录信息中保存 UE的相关信息（例如： 前述的切换目标小区准备等）和 UE的切换状态等信息， 该切换记录信息用于 指示 UE发生切换的源小区和目标小区的对应关系。 最后， 源 eNB ^查找出 的切换记录信息确定 UE在源小区和目标小区之间发生了过早切换事件。此时， 源 eNB接收到 RRC连接重建请求时切换定时器处于开启且未超时的状态， 且 RRC连接重建请求中的重建原因信息为 RLF信息，则确定本次过早切换事件为 第二过早切换事件。
( 2 )对于第一过早切换事件的第三种形式。
UE在定时器 T304超时之前， 成功地接入到了目标小区， 但是未能成功地 向目标小区发送 RRC连接重配完成消息， 产生 RLF。 此时 UE使用目标小区的 配置， 因此， RRC连接重建请求中携带的 ID信息仍然是目标小区 UE ID、 目标 小区 ID。 当源 eNB接收到 RRC连接重建请求时切换定时器处于未开启的状态， 且 RRC连接重建请求中的重建原因为 RLF信息，则采用第二种检测方法同样能 够确定本次过早切换事件为第一过早切换事件。
通过本实施例提供的检测过早切换方法，源 eNB能够检测出是否发生了过 早切换事件。 需要说明的是， 当 SON中发生了过早切换事件， 则 UE需要向源 eNB发送 RRC连接重建请求， 以触发无线链路快速恢复的流程，具体地 LTE系统中定义 的无线链路快速恢复的流程可以包括以下内容。
111、 UE根据选择条件， 重新选择合适的小区。
其中， 该选择条件为 UE所选择的小区的信号质量应当满足小区的驻留要 求： 中继站接收功率（ Relay station Received Power, 以下简称 RSRP ) 大于小 区中的最小接收水平值（Qrxlevmin )， 即 RSRP> Qrxlevmin。 该合适的小区可以 为上述实施例部分提及的源小区和目标小区。
进一步地， 当 UE开始选择合适的小区时， UE启动自身的定时器 T311 , 该 定时器 T311用于限定 UE选择合适小区的时间。若在该定时器 T311超时前， UE 找到合适的小区， 则执行 112; 否则无线连接重建失败， UE进入空闲状态。
112、 UE向选择的合适小区发送 RRC连接重建请求， 接入所选小区。
UE选择到合适的小区后， UE将停止定时器 T311 , 启动定时器 T301 , 并读 取所选小区的广播信息的系统信息。 其中， 该 RRC连接重建请求可以参见本 实施例的上述描述， 此处不再赘述。 该定时器 T301用于限定 UE重建 RRC连接 的时间。
113、 所选小区的 eNB接受 UE的 RRC连接重建请求， 并向 UE返回 RRC连 接重建 (如 RRC Connection reestablishment ) 消息。
当 UE发送的 RRC连接重建请求成功到达 UE所选的小区，且该小区中已经 准备好 UE的上下文（Context )信息， 则 eNB接受 UE的 RRC连接重建请求， 并 向 UE返回 RRC连接重建消息； 否则， 所选小区的 eNB拒绝 UE的 RRC连接重建 请求， 并向 UE返回 RRC连接重建拒绝 （如 RRC Connection reestablishment Reject ) 消息。
进一步地， 通过上述说明， 可以看出经过 RRC连接重建后， UE能够重建 成功的小区可以为源小区和预先准备好 UE的上下文信息的小区。
114、 RRC连接重建成功。
当 UE接收到所选小区的 eNB返回的 RRC连接重建消息后， UE停止定时器 T301 , 成功重建与所选小区的 RRC连接。
若源 eNB返回的是 RRC连接重建拒绝消息， 或者定时器 T301超时之前， UE未能收到源 eNB返回的 RRC连接重建消息， 则 RRC连接重建失败， UE进入 闲置状态。
进一步地， 当 RRC连接重建失败， UE进入空闲状态后， 本实施例提供了 使 UE重新连接到源小区的方法， 即： 由非接入层触发 UE将上一次无线链路失 败的原因以及问题信息 （如上次 RRC重建携带的小区标识、 UE标识等）携带 在 RRC连接请求（如 RRC Connection Request ) 中向网络侧 （源 eNB )发送， 通知给当前连接的小区， 使得网络侧 （源 eNB ) 能够在未收到 UE RRC连接重 建请求消息的情况下，仍然有机会获得 RLF事件或者 HOF事件，从而检测过早 切换的发生。
本实施例中， 源 eNB根据 UE对应的切换记录信息， 确定 UE与目标 eNB之 间发生过早切换事件， 省去了源 eNB与目标 eNB之间的信令交互， 提高了无线 网络资源的使用效率。
图 2为本发明实施例二提供的检测过早切换方法的流程示意图， 本实施例 以上述实施例一为基 ， 针对第一种检测方法进行详细说明。 本实施例的第 一种检测方法可以用于检测第一过早切换事件的第一种形式和第二种形式， 两种形式具体为：
第一种形式， UE成功地接收到源 eNB发送的切换命令， 但在定时器 T304 超时之前， UE—直未能接入到目标小区， 产生 HOF;
第二种形式， UE在定时器 T304超时之前， 成功地接入到了目标小区， 但 是未能成功地向目标小区发送 RRC连接重配完成消息， 产生 RLF。
需要说明的是， 在第二种形式中产生 RLF时， UE仍然使用源小区的配置， 则 UE向源 eNB发送的 RRC连接重建请求中携带源小区 UE ID和源小区 ID，由于 此时 UE未成功切换到目标小区中， 因此， 源 eNB中仍然保存有与源小区 UE ID 及源 、区 ID对应的上下文信息。
如图 2所示， 本实施例可以包括以下内容。
201、 切换定时器未启动， 源 eNB成功地接收到 UE发送的 RRC连接重建请 求， 该 RRC连接重建请求中携带有源小区 UE ID、 源小区 ID和重建原因信息。
其中， RRC连接重建请求可以参见上述实施例一中第一种检测方法描述 中的 RRC连接重建请求， 此处不再赘述。 本实施例中， 第一过早切换事件发 生后， UE未成功切换到目标 eNB， 则目标 eNB不会向源 eNB发送 UE上下文释 放消息， 因此该切换定时器处于未启动状态。
产生 RLF或 HOF后， UE进行通信链路的重建时， 向源 eNB发送 RRC连接 重建请求， 触发源 eNB检测 SON中是否发生过早切换事件。
202、 源 eNB判断 RRC连接重建请求中携带的重建原因信息是否为 RLF信 息或 HOF信息， 若是， 则执行 203; 若否， 则结束流程。
在 202中， 当源 eNB确定 RRC连接重建请求中携带的重建原因为 RLF信息 或 HOF信息时， 则可以确定 UE发生了过早切换事件， 并执行 203。
203、 源 eNB ^据源小区 UE ID和源小区 ID查找相应的上下文信息。
本实施例针对第一过早切换事件的第一种形式和第二种形式进行检测的 方法进行描述， 因此， 本实施例的切换记录信息以源 eNB分配并保存的 UE上 下文信息为例进行说明， 其中， 该上下文信息保存有 UE的切换记录， 用于指 示 UE发生切换的源小区和目标小区的对应关系。
在获 目应的上下文信息时， 源 eNB首先 据源小区 ID以及源小区 UE ID 从源小区的上下文信息中查找出 UE的上下文信息。
204、 源 eNB根据 UE的上下文信息确定 UE在源小区和目标小区之间发生 了第一过早切换事件。
进一步地， 由于切换定时器处于未启动状态， 且 RRC连接重建请求中携 带的重建原因为 RLF信息或 HOF信息， 则源 eNB能够根据 UE的上下文信息确 定 UE是在相应的源小区和目标小区之间发生了第一过早切换事件。
本实施例中， 源 eNB根据 UE对应的切换记录信息， 确定 UE与目标 eNB之 间发生过早切换事件， 省去了源 eNB与目标 eNB之间的信令交互， 提高了无线 网络资源的使用效率。
图 3为本发明实施例三提供的检测过早切换方法的流程示意图， 本实施例 以上述实施例一为基 ， 详细说明了采用第二种检测方法对第一过早切换事 件的第三种形式进行检测的场景。
需要说明的是， 第一过早切换事件的第三种形式与上述实施例二中的第 二种形式的区别在于，发生 RLF或 HOF时， UE使用目标小区的配置， 向源 eNB 发送的 RRC连接重建请求中携带有目标小区 ID和目标小区 UE ID, 由于此时 UE未成功切换到目标小区中， 因此， 源 eNB中仍然保存有源 eNB分配给 UE的 上下文信息， 但该上下文信息与目标小区 ID或目标小区 UE ID不对应， 源 eNB 无法根据 RRC连接重建请求中携带的目标小区 ID和目标小区 UE ID获取到正 确的 UE上下文信息。 在这种场景中， 本实施例的源 eNB中维护有一个切换记 录信息， 该切换记录信息中记录有 UE的切换状态， 用于指示 UE发生切换的源 小区和目标小区的对应关系， 信息内容是由目标 eNB传递给源 eNB的。 该切换 记录信息在切换定时器超时或者接收到 UE发送的 RRC连接重建或者 RRC连接 建立请求时释放。
具体地， 源 eNB维护该切换记录信息方法可以包括以下三种方式：
( 1 )在源 eNB与目标 eNB完成切换准备时， 由目标 eNB将目标小区 UE ID 和目标小区 ID携带在切换请求响应（ Handover Request ACK )消息向源 eNB发 送。 源 eNB接收到该切换请求响应消息后，对该切换请求响应消息中的容器进 行解析， 获取该切换请求响应的容器中携带的目标小区 UE ID和目标小区 ID， 最后将该目标小区 UE ID和目标小区 ID保存到切换记录信息中， 使得源 eNB能 够查找出发生过早切换事件的 UE的切换记录信息。 此时可以启动该定时器。
需要说明的是，现有技术中源 eNB接收到该切换请求响应消息后， 不对该 切换请求消息中的容器进行解析， 而是直接以切换命令的形式向 UE转发。 本 实施例中通过对该切换请求响应消息中的容器进行解析，能够在源 eNB释放了 UE的上下文信息后， 仍然有 UE的切换状态。
更进一步， 目标 eNB也可以在容器外携带上述信息， 此时源 eNB就不需要 解析容器从而获取相关信息， 直接从切换请求消息中获取相关信息。
( 2 )在 UE成功切换到目标 eNB时， 由目标 eNB将目标小区 UE ID和目标 小区 ID携带在 UE上下文释放消息中向源 eNB发送。 源 eNB接收到该 UE上下文 释放消息后， 将该 UE上下文释放消息中的目标小区 UE ID和目标小区 ID保存 到所述切换记录信息中； 在该消息中， 也可以携带目标小区指定的定时器值。 此时可以启动定时器。
( 3 )目标 eNB可以通过新增消息携带目标小区 ID、 目标小区 UE ID、 RLF 信息或 HOF信息来通知源 eNB。
源 eNB可以根据实际情况的需求， 选择上述三种方式来维护切换记录信 如图 3所示， 本实施例可以包括以下内容。
301、当切换定时器未启动时，源 eNB接收到 UE发送的 RRC连接重建请求， 该 RRC连接重建请求中携带有目标小区 UE ID、 目标小区 ID和重建原因信息。
其中， RRC连接重建请求可以参见上述实施例一中第二种检测方法描述 中的 RRC连接重建请求，此处不再赘述。本实施例中， UE成功接入到目标 eNB, 但没有成功发送重配完成消息， 则目标 eNB不会向源 eNB发送 UE上下文释放 消息， 则源 eNB中的切换定时器保持在未启动状态。
302、 源 eNB判断 RRC连接重建请求中携带的重建原因信息是否为 RLF信 息或 HOF信息， 若是， 则执行 303; 若否， 则结束流程。
在 302中， 当源 eNB确定 RRC连接重建请求中携带的重建原因为 RLF信息 或 HOF信息时， 则可以确定 UE发生了过早切换事件， 并执行 303。
303、 源 eNB ^居目标小区 UE ID和目标小区 ID查找出相应的切换记录信
304、 源 eNB根据 UE的切换记录信息确定 UE在源小区和目标小区之间发 生了第一过早切换事件。
本实施例中， 源 eNB根据 UE对应的切换记录信息， 确定 UE与目标 eNB之 间发生过早切换事件， 省去了源 eNB与目标 eNB之间的信令交互， 提高了无线 网络资源的使用效率。
更进一步地，在检测过早切换事件的基 上，本实施例通过目标 eNB将目 标小区 UE ID和目标小区 ID发送给源 eNB， 由源 eNB将目标小区 UE ID和目标 小区 ID保存到切换记录信息中，使得源 eNB能够维护一个切换记录信息， 当源 eNB中分配并维护的上下文信息与 RRC连接重建请求中的标识信息不对应的 情况下，源 eNB能够根据获取的切换记录信息进一步判断出发生过早切换事件 的源小区和目标小区， 使 MRO更为精确地对切换参数进行优化。
图 4为本发明实施例四提供的检测过早切换方法的流程示意图， 本实施例 以上述实施例一为基 ， 详细说明了采用第二种检测方法对第二过早切换事 件进行检测的场景。
需要说明的是，对于第二过早切换事件， UE已经成功切换到了目标小区， 则源 eNB已经收到了目标 eNB发送的 UE上下文释放消息， 并根据该 UE上下文 释放消息的指示释放了源 eNB分配给 UE的上下文消息， 导致源 eNB不能检测 是否发生了过早切换事件， 为了解决这一问题，本实施例的源 eNB中维护有一 个切换记录信息， 该切换记录信息中记录有 UE的切换状态， 该切换记录信息 在切换定时器超时或者接收到 UE发送的 RRC连接重建或者 RRC连接建立请求 时释放。 其中， 该 UE的上下文信息、 切换记录信息， 以及源 eNB维护该切换 记录信息的方法已经在上述实施例三中进行了详细说明， 此处不再赘述。
如图 4所示， 本实施例可以包括以下内容。
401、 当切换定时器启动且超时前， 源 eNB接收到 UE发送的 RRC连接重建 或者 RRC连接建立请求， 该请求中携带有目标小区 UE ID、 目标小区 ID和重建 原因信息。
其中， RRC连接重建请求可以参见上述实施例一中第二种检测方法描述 中的 RRC连接重建请求， 此处不再赘述。 本实施例中， 第二过早切换事件发 生， UE成功切换到目标 eNB， 则目标 eNB向源 eNB发送 UE上下文释放消息， 因此该切换定时器处于启动状态， 但此时该切换定时器尚未超时。
402、 源 eNB判断 RRC连接重建请求中携带的重建原因信息是否为 RLF信 息或 HOF信息， 若是， 则执行 403; 若否， 则结束流程。
在 402中， 当源 eNB确定 RRC连接重建请求中携带的重建原因为 RLF信息 或 HOF信息时， 则可以确定 UE发生了过早切换事件， 并执行 303。
403、 源 eNB ^居目标小区 UE ID和目标小区 ID查找出相应的切换记录信
404、 源 eNB根据 UE的切换记录信息确定 UE在源小区和目标小区之间发 生了第二过早切换事件。
具体地， 由于切换定时器处于启动且未超时的状态， 并且 RRC连接重建 请求中携带的重建原因为 RLF信息， 则可以确定 UE在切换过程中发生了第二 过早切换事件。 通过本步骤的执行， 源 eNB能够根据 UE的切换记录信息进一 步确定 UE是在相应的源小区和目标小区之间发生了第二过早切换事件。
本实施例针对第二种检测方法进行描述， 本实施例的切换记录信息已经 在上述实施例一中进行了详细说明， 此处不再赘述。 本实施例中， 源 eNB根据 UE对应的切换记录信息， 确定 UE与目标 eNB之 间发生过早切换事件， 省去了源 eNB与目标 eNB之间的信令交互， 提高了无线 网络资源的使用效率。
进一步地，在检测过早切换事件的基 上，本实施例通过目标 eNB将目标 小区 UE ID和目标小区 ID发送给源 eNB, 由源 eNB将目标小区 UE ID和目标小 区 ID保存到切换记录信息中， 使得源 eNB能够维护一个切换记录信息， 当源 eNB释放了源 eNB分配给 UE的上下文信息后，源 eNB能够根据获取的切换记录 信息进一步判断出发生过早切换事件的源小区和目标小区， 是 MRO更为精确 地对切换参数进行优化。
图 5为本发明实施例五提供的基站结构示意图， 本实施例提供的基站 10可 用于实现上述实施例 1 - 4提供的检测过早切换的方法。
如图 5所示， 本实施例的基站 10包括： 第一获取单元 11、 第二获取单元 12 和检测单元 13。 其中， 第一获取单元 11获取用户设备 UE的切换事件信息， 该 切换事件信息包括小区标识、 UE标识、 以及无线链路失败 RLF信息或切换失 败 HOF信息； 第二获取单元 12根据上述 UE的切换事件信息获取该 UE的切换记 录信息， 该 UE的切换记录信息保存该 UE的切换状态和该 UE发生切换的源小 区和目标小区的对应关系；检测单元 13根据上述 UE的切换记录信息确定该 UE 在源小区和目标小区之间发生过早切换事件。
可选地， 上述基站 10还可以包括维护单元 14， 用于维护上述 UE的切换记 录信息。 该维护单元 14可进一步包括获取模块 140和保存模块 141， 其中， 获 取模块 140从目标基站发送的切换请求响应消息或上下文释放消息中获得目 标小区的标识以及目标小区 UE标识； 保存模块 141将上述目标小区 UE标识和 目标小区标识保存到切换记录信息中。
具体地， 上述获取模块 140可进一步用于： 接收目标基站发送的切换请求 响应消息； 解析该切换请求响应消息， 获取目标小区标识以及目标小区 UE标 识， 或者解析该切换请求响应消息中的容器， 获取该容器中携带的目标小区 标识以及目标小区 UE标识。 或者可选地， 上述获取模块 140可进一步用于： 接 收目标基站发送的 UE上下文释放消息，该 UE上下文释放消息中携带目标小区 标识和目标小区 UE标识。 可选地， 上述第一获取单元 11可进一步用于： 接收上述 UE发送的无线资 源控制 RRC连接重建请求或 RRC连接请求， 该 RRC连接重建请求或 RRC连接 请求中携带上述切换事件信息。
可选地， 上述基站还包括： 启动单元 15， 用于当接收到目标基站发送的 切换请求响应消息时， 或当接收到目标基站发送的 UE上下文释放消息时， 启 动与上述切换记录信息相关联的切换定时器。
当上述启动单元 15未启动切换定时器时， 上述检测单元 13进一步用于， 根据小区标识和 UE标识获取 UE对应的上下文信息， 并才 据上述 RLF信息或 HOF信息与上述上下文信息确定该 UE在源小区和目标小区之间发生第一过早 切换事件。 上述上下文信息用于指示 UE发生切换的源小区和目标小区的对应 关系； 此时， 切换记录信息为上下文信息。
当上述启动单元 15启动切换定时器， 且该切换定时器超时前， 上述检测 单元 13进一步用于，根据上述 RLF信息或 HOF信息与上述切换记录信息确定上 述 UE在源小区和目标小区之间发生第二过早切换事件。
上述的第一过早切换事件和第二切换过早事件如方法实施例所述， 此处 不再赘述。
本发明实施例还提供一种检测过早切换系统， 该系统可用于实现上述实 施例 1 - 4提供的检测过早切换的方法， 该系统包括用户设备切换的目标基站 和源基站， 该源基站为上述图 5所示实施例中的基站。
在 LTE系统中， 上述实施例提供的基站为 eNB。
上述实施例提供的基站和系统， 源 eNB根据 UE对应的切换记录信息， 确 定 UE与目标 eNB之间发生过早切换事件，省去了源 eNB与目标 eNB之间的信令 交互， 提高了无线网络资源的使用效率。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的范围。

Claims

权 利 要 求
1、 一种检测过早切换的方法， 其特征在于， 所述方法包括：
获取用户设备 UE的切换事件信息， 所述切换事件信息包括小区标识、 UE 标识， 还包括无线链路失败 RLF信息或切换失败 HOF信息；
根据所述 UE的切换事件信息获取所述 UE的切换记录信息， 所述 UE的切 换记录信息保存所述 UE的切换状态和所述 UE发生切换的源小区和目标小区 的对应关系；
根据所述 UE的切换记录信息确定所述 UE在所述源小区和目标小区之间 发生过早切换事件。
2、 根据权利要求 1所述的方法， 其特征在于， 所述方法还包括： 维护所 述 UE的切换记录信息， 所述维护所述 UE的切换记录信息具体包括：
从目标基站发送的切换请求响应消息或上下文释放消息中获得目标小区 的标识以及目标小区 UE标识；
将所述目标小区 UE标识和目标小区标识保存到所述的切换记录信息中。
3、 根据权利要求 2所述的方法， 其特征在于， 所述从目标基站发送的切 换请求响应消息中获得目标小区的标识以及目标小区 UE标识， 包括：
接收目标基站发送的切换请求响应消息；
解析所述切换请求响应消息， 获取所述目标小区标识以及目标小区 UE标 识， 或者， 解析所述切换请求响应消息中的容器， 获取所述容器中携带的所 述目标小区标识以及目标小区 UE标识。
4、 根据权利要求 2所述的方法， 其特征在于， 所述从目标基站发送的上 下文释放消息中获得目标小区的标识以及目标小区 UE标识， 包括：
接收目标基站发送的 UE上下文释放消息，所述 UE上下文释放消息中携带 所述目标小区标识和目标小区 UE标识。
5、 根据权利要求 1所述的方法， 其特征在于， 所述获取 UE的切换事件信 息包括：
接收所述 UE发送的无线资源控制 RRC连接重建请求或 RRC连接请求， 所 述 RRC连接重建请求或 RRC连接请求中携带所述切换事件信息。
6、 根据权利要求 1所述的方法， 其特征在于， 所述方法还包括： 当接收到目标基站发送的切换请求响应消息时， 启动与所述切换记录信 息相关联的切换定时器； 或者
当接收到目标基站发送的 UE上下文释放消息时， 启动与所述切换记录信 息相关联的切换定时器。
7、 根据权利要求 6所述的方法， 其特征在于， 所述切换记录信息为上下 文信息； 所述根据所述切换记录信息确定所述 UE在所述源小区和目标小区之 间发生过早切换事件包括：
当所述切换定时器未启动时，根据所述小区标识和 UE标识获取所述 UE对 应的上下文信息， 所述上下文信息用于指示所述 UE发生切换的源小区和目标 小区的对应关系；
根据所述 RLF信息或 HOF信息与所述上下文信息确定所述 UE在所述源小 区和目标小区之间发生第一过早切换事件。
8、 根据权利要求 6所述的方法， 其特征在于， 所述根据所述切换记录信 息确定所述 UE在所述源小区和目标小区之间发生过早切换事件包括：
在所述切换定时器超时前，根据所述 RLF信息或 HOF信息与所述切换记录 信息确定所述 UE在所述源小区和目标小区之间发生第二过早切换事件。
9、 一种基站， 其特征在于， 包括：
第一获取单元， 用于获取用户设备 UE的切换事件信息， 所述切换事件信 息包括小区标识、 UE标识， 还包括无线链路失败 RLF信息或切换失败 HOF信 第二获取单元，用于根据所述 UE的切换事件信息获取所述 UE的切换记录 信息， 所述 UE的切换记录信息保存所述 UE的切换状态和所述 UE发生切换的 源小区和目标小区的对应关系； 和
检测单元，用于根据所述 UE的切换记录信息确定所述 UE在所述源小区和 目标小区之间发生过早切换事件。
10、 根据权利要求 9所述的基站， 其特征在于， 所述基站还包括： 维护单元， 用于维护所述 UE的切换记录信息；
所述维护单元进一步包括：
获取模块， 用于从目标基站发送的切换请求响应消息或上下文释放消息 中获得目标小区的标识以及目标小区 UE标识； 和
记录模块， 用于将所述目标小区 UE标识和目标小区标识保存到所述的切 换记录信息中。
11、 根据权利要求 10所述的基站， 其特征在于， 所述获取模块进一步用 于：
接收目标基站发送的切换请求响应消息；
解析所述切换请求响应消息， 获取所述目标小区标识以及目标小区 UE标 识， 或者， 解析所述切换请求响应消息中的容器， 获取所述容器中携带的所 述目标小区标识以及目标小区 UE标识。
12、 根据权利要求 10所述的基站， 其特征在于， 所述获取模块进一步用 于： 接收目标基站发送的 UE上下文释放消息， 所述 UE上下文释放消息中携带 所述目标小区标识和目标小区 UE标识。
13、 根据权利要求 9所述的基站， 其特征在于， 所述第一获取单元进一步 用于： 接收所述 UE发送的无线资源控制 RRC连接重建请求或 RRC连接请求， 所述 RRC连接重建请求或 RRC连接请求中携带所述切换事件信息。
14、 根据权利要求 9所述的基站， 其特征在于， 所述基站还包括： 启动单元， 用于当接收到目标基站发送的切换请求响应消息时， 或当接 收到目标基站发送的 UE上下文释放消息时， 启动与所述切换记录信息相关联 的切换定时器。
15、 根据权利要求 14所述的基站， 其特征在于，
所述切换记录信息为上下文信息；
所述检测单元进一步用于， 当所述启动单元未启动所述切换定时器时， 根据所述小区标识和 UE标识获取所述 UE对应的上下文信息，所述上下文信息 用于指示所述 UE发生切换的源小区和目标小区的对应关系； 根据所述 RLF信 息或 HOF信息与所述上下文信息确定所述 UE在所述源小区和目标小区之间发 生第一过早切换事件。
16、 根据权利要求 14所述的基站， 其特征在于， 所述检测单元进一步用 于， 当所述启动单元启动所述切换定时器， 且所述切换定时器超时前， 根据 所述 RLF信息或 HOF信息与所述切换记录信息确定所述 UE在所述源小区和目 标小区之间发生第二过早切换事件。
17、 一种检测过早切换系统， 其特征在于， 所述系统包括用户设备切换 的目标基站和源基站， 所述源基站为如权利要求 9-16任一项所述的基站。
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