WO2017185880A1 - 一种小区切换方法及装置 - Google Patents

一种小区切换方法及装置 Download PDF

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Publication number
WO2017185880A1
WO2017185880A1 PCT/CN2017/075870 CN2017075870W WO2017185880A1 WO 2017185880 A1 WO2017185880 A1 WO 2017185880A1 CN 2017075870 W CN2017075870 W CN 2017075870W WO 2017185880 A1 WO2017185880 A1 WO 2017185880A1
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Prior art keywords
cell
handover
neighboring
message
same coverage
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PCT/CN2017/075870
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English (en)
French (fr)
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尹海峰
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中兴通讯股份有限公司
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Publication of WO2017185880A1 publication Critical patent/WO2017185880A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic

Definitions

  • the present disclosure relates to the field of communications, and in particular to a cell handover method and apparatus.
  • a significant difference between mobile communication systems and fixed communication systems is "mobility.”
  • the location of the UE (User Equipment) in the mobile communication system is in a state of constant change. Since the coverage of a single cell is always limited, in order not to affect the user experience, it is necessary to continuously replace the serving cell for the UE.
  • LTE Long Term Evolution
  • RRC_CONNECTED Radio Resource Control Connected
  • the handover is mainly divided into three phases: handover related measurement delivery, handover decision, and handover execution.
  • the base station sends the measurement configuration for the handover to the UE.
  • the UE reports the measurement report, and the base station performs a handover decision according to the measurement report, and selects the target cell to perform the handover.
  • the UE When the target cell is a plurality of the same coverage cell, the UE is always first switched to the target cell of the same frequency because the intra-frequency measurement control is always sent first.
  • the crowd moves intensively, the target's co-frequency cell load will increase rapidly, while the cells of other frequencies covered by the same are relatively idle.
  • the UE may always be connected to a certain frequency point first, which also causes the above problem.
  • the existing LTE system is designed with a load balancing function to balance the wireless load between the coverage cells.
  • the load balancing function needs to complete the handover of the UE between the coverage cells by another handover, and the device is added. The burden also delays the timing of the UE entering the best cell.
  • the technical problem to be solved by the present disclosure is to provide a cell handover method and apparatus to solve the problem that there is an invalid handover in the existing cell handover process.
  • an embodiment of the present disclosure provides a cell handover method, including:
  • the UE is instructed to switch from the source cell to the target cell.
  • the step of determining a cell as the target cell from the same coverage neighboring cell group according to the load state of each cell in the neighboring cell group includes:
  • a first cell is selected as the target cell from the handover candidate neighboring cell.
  • the step of selecting a first cell from the handover candidate neighboring cell as the target cell includes:
  • the step of selecting a first cell from the handover candidate neighboring cell as the target cell includes:
  • the method further includes: sending a handover preparation message to the second cell, and receiving the message that the handover preparation failure returned by the second cell is received, and the method further includes:
  • the second cell When the reason for the returned handover preparation failure is the capacity reason, the second cell is no longer selected within the predetermined time, and the load state of the second cell is set to the second load state opposite to the first load state.
  • the step of acquiring the same coverage neighboring cell group that has the same coverage relationship with the neighboring cell that is measured by the user equipment UE of the current access source cell includes:
  • an embodiment of the present disclosure provides a cell switching apparatus, including:
  • An acquiring module configured to acquire a same coverage neighboring cell group that has the same coverage relationship with the neighboring cell that is measured by the user equipment UE of the current access source cell;
  • Determining a module configured to determine, according to a load state of each cell in the neighboring cell group, a cell as a target cell from the same coverage cell group;
  • an indication module configured to instruct the UE to switch from the source cell to the target cell.
  • the determining module comprises:
  • a first acquiring sub-module configured to acquire a handover candidate neighboring cell in a coverage neighboring cell group with a load state being a first load state
  • the sub-module is selected to be selected as a target cell from the handover candidate neighboring cell.
  • the selection sub-module includes:
  • a first selecting unit configured to select a first cell by polling from the handover candidate neighboring cell
  • the first determining unit is configured to send a handover preparation message to the selected first cell, and after receiving the message that the handover preparation returned by the first cell is successful, determine that the first cell is the target cell.
  • the selection sub-module includes:
  • a second selecting unit configured to arbitrarily select a second cell from the handover candidate neighboring cell
  • the first processing unit is configured to send a handover preparation message to the selected second cell, and after receiving the message that the handover preparation failure returned by the second cell is received, select a first cell from the handover candidate neighboring cell;
  • the second determining unit is configured to send a handover preparation message to the first cell, and determine that the first cell is the target cell when receiving the message that the handover preparation returned by the first cell is successful.
  • the selection sub-module also includes:
  • the second processing unit is configured to: when the reason for the failed handover preparation failure is the capacity reason, the second cell is no longer selected within the predetermined time, and the load state of the second cell is set to be opposite to the first load state. Two load status.
  • the acquisition module includes:
  • the second acquiring sub-module is configured to acquire the same coverage neighboring cell group that has the same coverage relationship with the neighboring cell reported by the UE according to the coverage relationship between the neighboring cells of the source cell that is pre-maintained.
  • an embodiment of the present disclosure provides a computer storage medium storing execution instructions for performing the above method.
  • the cell handover method and apparatus largely reduce one unnecessary handover, reduce system load, and enable the UE to quickly and directly switch to the target cell.
  • FIG. 1 is a schematic diagram of a wireless coverage scenario in which a target side is a plurality of co-covered cells;
  • FIG. 2 is a schematic diagram showing an existing cell handover in the wireless coverage scenario shown in FIG. 1;
  • FIG. 3 is a schematic diagram of cell handover according to an embodiment of the present disclosure in the wireless coverage scenario shown in FIG. 1;
  • FIG. 4 is a schematic flowchart diagram of a cell handover method according to an embodiment of the method of the present disclosure
  • FIG. 5 shows a specific implementation example of a cell handover method provided by an embodiment of the method according to the present disclosure
  • FIG. 6 is a schematic signaling diagram of a cell handover method according to a first embodiment of the present disclosure
  • FIG. 7 is a schematic flowchart diagram of a cell handover method according to a first embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram showing signaling of a cell handover method according to a second embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart diagram of a cell handover method according to a second embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a cell switching apparatus according to an embodiment of the present disclosure.
  • the load balancing function is used to balance the load between cells, between frequencies, and between wireless access technologies. This feature balances the performance of the entire system and improves system stability. This function is based on the service cell and its neighboring area load state to properly deploy cell traffic, and effectively use system resources to improve system capacity and improve system stability. In general, the load balancing function can be divided into three phases.
  • the load status of the serving cell and the load status of the neighboring cells are continuously monitored and updated. If an X2 interface exists, the load information of the adjacent station neighboring area is obtained through the X2 interface periodically, or the load information of the neighboring area of the base station is obtained through an internal message. If the UMRAN (UMTS Terrestrial Radio Access Network) system supports the RIM (RAN Information Management) process, the UTRAN system neighbor load information is obtained through the RIM process of the S1 port.
  • UMRAN UMTS Terrestrial Radio Access Network
  • RIM Radio Information Management
  • the decision phase it is determined whether the serving cell is in a high load state according to the measurement information collected during the measurement phase. If the serving cell is in a high load state, the load balancing execution phase will be triggered. Otherwise, the load measurement phase and the decision phase are repeated.
  • the serving cell is in a high load state.
  • Some user equipments in the serving cell are selected to perform A4 (load balancing in LTE) or B1 (load balancing between systems) measurements, and according to the measurement result of the UE, the UE selected for handover is switched to a low-load neighbor. Area. Under the condition of blind handover, the UE is directly switched to the low-load neighboring cell.
  • the load of the radio resource that is, the physical resource block (PRB) utilization rate of the cell, is the only load factor to be considered for load balancing at this stage.
  • PRB physical resource block
  • the method of the present disclosure provides a cell handover method, which comprehensively considers measurement and load balancing, and directly switches a UE to a cell on a target side that satisfies the condition, so that the basic technology can be used.
  • the UE reduces the handover process of the UE, reduces the system load, saves air interface resources, and improves the user experience.
  • a cell handover method provided by an embodiment of the present disclosure may include the following steps:
  • Step 101 Acquire a same coverage neighboring cell group that has the same coverage relationship with the neighboring cell that is measured by the user equipment UE of the current access source cell.
  • the neighboring cell that is reported to be reported by the acquired UE is obtained, and the same coverage neighboring cell group having the same coverage relationship with the neighboring cell reported by the UE is obtained.
  • Step 102 Determine, according to the load status of each cell in the neighboring cell group, that one cell is the target cell from the same coverage neighbor cell group.
  • the load state of each cell in the neighboring cell group is acquired, and then one cell is determined as a target cell from the same coverage cell group according to the load state of each cell.
  • This embodiment is for covering the cells in the adjacent cell group.
  • the manner of obtaining the load state is not limited, and is merely illustrated here.
  • a cell belonging to the same base station in the same coverage neighboring cell group may acquire a load state of the cell through an internal message of the base station; for a cell belonging to a different base station in the same coverage neighboring cell group, when the base station is configured with an X2 interface and transmitting If the IMS process is not supported by the X2 interface, the RIM process of the S1 interface can be used to obtain the same coverage.
  • the target cell determined in the foregoing step 102 is a certain cell determined in the same coverage neighboring cell group according to the load state of each cell in the neighboring cell group, and is not necessarily acquired.
  • the arriving UE measures the reported neighboring cell.
  • Step 103 Instruct the UE to switch from the source cell to the target cell.
  • step 103 belongs to the existing process, and the embodiment is not described herein.
  • step 102 the step of determining a cell as the target cell from the same coverage neighboring cell group according to the load state of each cell in the neighboring cell group may include:
  • the load state of the cell includes a first load state and a second load state opposite to the first load state.
  • the first load state is referred to as a low load state
  • the second load state is referred to as a high load state.
  • the cell in the same neighboring cell group with the load state as the low load state is used as the handover candidate neighboring cell.
  • the cell in the same neighboring cell group as the load state in the high load state may be set as unselectable.
  • a first cell is selected as the target cell from the handover candidate neighboring cell.
  • the step of selecting a first cell from the handover candidate neighboring cell as the target cell may include:
  • the polling selected policy is used to select one cell from the handover candidate neighboring cell, that is, the first cell.
  • an arbitrarily selected policy may also be used to select a cell from the handover candidate neighboring cell.
  • the existing procedure is used to send a handover preparation message to the selected first cell, and after receiving the message that the handover preparation returned by the first cell is successful, the first cell is determined as the target cell to perform the foregoing step 103.
  • the step of selecting a first cell from the handover candidate neighboring cell as the target cell includes:
  • an arbitrarily selected policy is used to select one cell from the handover candidate neighboring cell, that is, the foregoing second cell.
  • a cell selected by the polling candidate neighboring cell may also be selected by using a polling selected policy. By randomly selecting or polling the selected policies, the UEs that need to perform cell handover in the source cell can be approximately switched to the cells in the same coverage neighboring cell group approximately equally.
  • the second cell returns a handover preparation failure message, and at this time, the secondary candidate is switched again. Select one cell arbitrarily in the zone.
  • the following steps are further included:
  • the second cell When the reason for the returned handover preparation failure is the capacity reason, the second cell is no longer selected within the predetermined time, and the load state of the second cell is set to the second load state opposite to the first load state.
  • the identifier of the handover preparation failure due to the capacity is pre-maintained.
  • the reason for the failure of the handover preparation failure is the capacity reason
  • the identifier is triggered, and the second cell is no longer selected within the predetermined time, and the second cell is selected.
  • the load state is set to the second load state, that is, the high load state.
  • the predetermined time may be set according to actual application requirements, for example, setting the predetermined time to 1 minute.
  • the cell A in the case of the cell A, the cell A exists in the same coverage neighboring cell group that has the same coverage relationship with the neighboring cell measured by the UE, and has been switched from the candidate neighboring cell.
  • the cell A is selected (in this case, the load state of the cell A is a low load state, and the cell A here is the second cell selected arbitrarily from the handover candidate neighboring cell).
  • the source cell sends a handover preparation message to the cell A.
  • multiple UEs may be handed over to the cell A, or other causes of load changes may occur, causing the load state of the cell A to change.
  • the cell A returns the message that the handover preparation fails, and the reason for the handover preparation failure is the capacity reason, that is, No radio resources available in target cell.
  • the source cell receives the cell A.
  • the pre-maintained identifier for the handover failure due to the capacity reason is triggered, and the load state of the cell A is set to the high load state, that is, the cell A is set to the high load cell, and the timer timing is set. In the minute (predetermined time), the cell A is no longer selected within the 1 minute.
  • the timer expires, the load state of the cell A is reset to the low load state, that is, the cell A is set as the low load cell.
  • the selection probability of the certain cell is decreased, wherein the reason for the failure of the handover preparation is not the capacity reason.
  • a penalty policy is added to reduce the selection probability of a certain cell.
  • step 101 the step of acquiring the same coverage neighboring cell group that has the same coverage relationship with the neighboring cell that is measured by the user equipment UE of the current access source cell may include:
  • the source cell maintains a coverage relationship between adjacent cells in advance, and sets a coverage neighboring cell group according to a coverage relationship between adjacent cells.
  • the coverage relationship between the neighboring cells can be obtained through the cell configuration data. take.
  • a group ID may be set for each of the neighboring cell groups to distinguish the neighboring cell groups.
  • the cell handover method provided by the method embodiment of the present disclosure which comprehensively considers measurement and load balancing, directly switches the UE to the cell on the target side that satisfies the condition, can greatly reduce the invalid handover process of the UE, and reduces system load and saves The air interface resources have improved the user experience.
  • the device embodiment of the present disclosure provides an apparatus for implementing the above method.
  • FIG. 10 is a schematic structural diagram of a cell switching apparatus according to an embodiment of the present disclosure.
  • the apparatus embodiment of the present disclosure provides a cell switching apparatus, including: an obtaining module 1010, a determining module 1020, and an indicating module 1030.
  • the acquiring module 1010 is configured to acquire the same coverage neighboring cell group that has the same coverage relationship with the neighboring cell that is measured by the user equipment UE of the current access source cell.
  • the determining module 1020 is configured to determine, according to the load status of each cell in the neighboring cell group, a cell as the target cell from the same neighboring cell group;
  • the indication module 1030 is configured to instruct the UE to switch from the source cell to the target cell.
  • the determining module 1020 includes: a first acquiring submodule and a selecting submodule.
  • a first acquiring sub-module configured to acquire a handover candidate neighboring cell in a coverage neighboring cell group with a load state being a first load state
  • the submodule is selected to select a first cell as the target cell from the handover candidate neighboring cell.
  • the selecting submodule includes: a first selecting unit and a first determining unit.
  • a first selecting unit configured to select a first cell by polling from the handover candidate neighboring cell
  • the first determining unit is configured to send a handover preparation message to the selected first cell, and after receiving the message that the handover preparation returned by the first cell is successful, determine that the first cell is the target cell.
  • the selecting submodule includes: a second selecting unit, a first processing unit, and a second determining unit.
  • a second selecting unit configured to arbitrarily select a second cell from the handover candidate neighboring cell
  • a first processing unit configured to send a handover preparation message to the selected second cell, and after receiving the message that the handover preparation failure returned by the second cell is received, select a first cell from the handover candidate neighboring cell;
  • a second determining unit configured to send a handover preparation message to the first cell, and determine that the first cell is the target cell when receiving the message that the handover preparation returned by the first cell is successful.
  • the selecting submodule further includes: a second processing unit.
  • a second processing unit configured to: when the reason for the failed handover preparation failure is a capacity reason, the second cell is no longer selected within a predetermined time, and the load state of the second cell is set to be opposite to the first load state. Two load status.
  • the obtaining module 1010 includes: a second acquiring submodule.
  • a second acquiring sub-module configured to acquire, according to the coverage relationship between the neighboring cells of the source cell that is pre-maintained, the same coverage neighboring cell group that has the same coverage relationship with the neighboring cell that is measured by the UE.
  • the cell switching device provided by the foregoing device embodiment is the same as the cell switching method provided by the method embodiment.
  • the cell switching apparatus provided by the embodiment of the present disclosure can directly reduce the UE to the target side cell by considering the measurement and load balancing, and can greatly reduce the UE's invalid handover process, thereby reducing system load and saving.
  • the air interface resources have improved the user experience.
  • the target side is a plurality of co-covered cells
  • the source side to the target side has no X2 link
  • the source side to the target side is switched based on S1.
  • the Src eNB indicates the base station where the source cell is located.
  • Step 701 Receive a measurement report of the UE.
  • the UE sends a Measure Report to the source cell through the Uu interface, and the source cell acquires the neighboring cell reported by the UE according to the received measurement report of the UE.
  • Step 702 Determine whether the neighboring cell reported by the measurement has the same coverage cell. Here, it is determined whether there is a same coverage neighboring cell group having the same coverage relationship with the neighboring cell reported by the UE measurement. When the determination result is yes, step 703 is performed; otherwise, the flow ends.
  • step 703 it is determined whether a cell is in a high load state.
  • the load state of each cell in the same coverage neighboring cell group having the same coverage relationship with the neighboring cell measured by the UE is determined. If the determination result is yes, step 704 is performed; otherwise, step 705 is performed.
  • step 704 the cell in the high load state is set to be unselectable.
  • a same coverage cell is randomly selected.
  • a same coverage cell is randomly selected from the coverage neighboring cell group, and the source cell sends a handover preparation message to the selected same coverage cell, specifically, the S1 interface of the local base station (Src eNB) to the MME (Mobility Management Entity, The mobility management entity sends a Handover Required message, and the MME sends a Handover request message to the base station (Dst eNB1) where the selected coverage cell (Dst eNB1Cell: 2 in FIG. 6) is located through the S1 interface; After receiving the message that the handover preparation success returned by the selected coverage cell is successful, the cell determines the selected coverage cell as the target cell.
  • the selected coverage cell sends a Handover Request Ack message through the S1 interface.
  • the MME sends a Handover Command message to the source cell through the S1 interface.
  • the selected same coverage cell is determined as the target cell. The case where the target cell returns a message that the handover preparation fails is not considered in this embodiment.
  • Step 706 instructing the UE to perform cell handover.
  • the source cell sends an RRC Connection Reconfiguration (RRC) message to the UE, and the UE sends an RRC connection reconfiguration complete message to the target cell to complete the access target cell.
  • RRC RRC Connection Reconfiguration
  • the target side is a plurality of co-covered cells
  • the source side to the target side has an X2 link and the transmission is normal
  • the source side to the target side is switched based on X2.
  • Step 901 Receive a measurement report of the UE.
  • the UE sends a Measure Report to the source cell through the Uu interface, and the source cell acquires the neighboring cell (Dst Cell a in FIG. 8) that the UE measures and reports according to the received measurement report of the UE.
  • the neighboring cell Dst Cell a in FIG. 8
  • Step 902 Determine whether the neighboring cell reported by the UE measures the presence of the same coverage cell. Here, it is determined whether there is a same coverage neighboring cell group having the same coverage relationship with the neighboring cell reported by the UE measurement. When the determination result is yes, step 903 is performed; otherwise, the flow ends.
  • step 903 it is determined whether a cell is in a high load state.
  • the load state of each cell in the same coverage neighboring cell group having the same coverage relationship with the neighboring cell measured by the UE is determined. If the determination result is yes, step 904 is performed; otherwise, step 905 is performed.
  • step 904 the cell in the high load state is set to be unselectable.
  • a same coverage cell is randomly selected.
  • a same coverage cell is randomly selected from the same coverage neighboring cell group, and the source cell sends a handover preparation message to the selected same coverage cell.
  • the selected same coverage cell is the cell b (Dst Cell b in FIG. 8)
  • the Handover Required message is sent to the cell b through the X2 interface of the local base station (Src eNB).
  • step 906 it is determined whether the handover preparation response has failed.
  • step 907 it is determined whether the handover preparation response received by the source cell is a failure, and if yes, step 907 is performed; otherwise, step 909 is performed.
  • step 907 it is determined whether the reason for the failure of the handover preparation is the capacity reason.
  • the cause of the handover preparation failure is a capacity cause, that is, whether the cause is No radio resources available in target cell, and if yes, step 908 is performed; otherwise, step 905 is re-executed.
  • Step 908 setting the same coverage cell as a high load cell.
  • the load state of the same coverage cell is set to a high load state within a predetermined time.
  • the cell b returns a Handover Request Failure message to the source cell through the X2 interface, and the source cell reselects a same coverage cell, that is, the cell c (Dst Cell in FIG. 8).
  • the source cell sends a Handover Required message to the cell c through the X2 interface, and after receiving the message that the handover preparation returned by the cell c is successful, the cell c is determined as the target cell.
  • the cell c sends the Handover Request through the X2 interface.
  • the Ack message is sent to the source cell, and at this time, the cell c is determined as the target cell.
  • Step 909 instructing the UE to perform cell handover.
  • the source cell sends an RRC Connection Reconfiguration message to the UE through the Uu interface, and the UE sends an RRC connection reconfiguration complete message to the target cell to complete the access target cell.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the portion of the technical solution of the present disclosure that contributes in essence or to the prior art or the portion of the technical solution may be embodied in the form of a software product stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present disclosure.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
  • the present disclosure is applicable to the field of communications to reduce unnecessary handovers and reduce system load while enabling the UE to quickly and directly switch to the target cell.

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Abstract

本公开提供一种小区切换方法及装置，其中，该小区切换方法包括：获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组；根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区；指示UE从源小区切换至目标小区。本公开的小区切换方法及装置可以在很大程度上减少一次不必要的切换，降低了***负荷，同时使UE能够迅速直接的切换到目标小区。

Description

一种小区切换方法及装置 技术领域
本公开涉及通信领域，特别是指一种小区切换方法及装置。
背景技术
移动通信***与固定通信***一个显著的区别在于“移动性”。移动通信***中UE(User Equipment，用户设备)位置处于不断变化的状态，由于单个小区的覆盖范围总是有限的，为了不影响用户体验，需要不断为UE更换服务小区。在LTE(Long Term Evolution，长期演进)***中，当UE处于RRC_CONNECTED(Radio Resource Control Connected，无线资源控制连接)状态时，移动性主要由切换或重定向来完成。
切换主要分为三个阶段：切换相关的测量下发、切换判决和切换执行。基站将用于切换的测量配置下发给UE，当测量配置的条件满足后UE上报测量报告，基站根据测量报告进行切换判决，选择目标小区执行切换。
当目标小区为多个同覆盖小区时，因为同频测量控制总是最先下发，所以UE总是会被首先切换到同频的目标小区中。在人群密集移动的时候，会导致目标的同频小区负荷迅速增长，而与其同覆盖的其它频点的小区却相对空闲。另外，在UE初始接入中，因为种种原因，也可能导致UE总是首先接入到某一个频点，同样会导致上述的问题。为解决上述问题，现有的LTE***设计了负荷均衡功能来均衡同覆盖小区之间的无线负荷，但是，负荷均衡功能需要通过再一次切换来完成同覆盖小区间的UE的转移，增加了设备负担，也延迟了UE进入最佳小区的时机。
发明内容
本公开要解决的技术问题是提供一种小区切换方法及装置，以解决现有的小区切换过程中存在一次无效切换的问题。
在第一方面，本公开的实施例提供一种小区切换方法，包括：
获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组；
根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区；
指示UE从源小区切换至目标小区。
其中，根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区的步骤包括：
获取同覆盖邻接小区组中，负荷状态为第一负荷状态的切换备选邻区；
从切换备选邻区中选取一第一小区作为目标小区。
其中，从切换备选邻区中选取一第一小区作为目标小区的步骤包括：
从切换备选邻区中轮询选取一第一小区；
向选取的第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息后，确定第一小区为目标小区。
其中，从切换备选邻区中选取一第一小区作为目标小区的步骤包括：
从切换备选邻区中任意选取一第二小区；
向选取的第二小区发送切换准备消息，并在接收到第二小区返回的切换准备失败的消息后，从切换备选邻区中任意选取一第一小区；
向第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息时，确定第一小区为目标小区。
其中，在向第二小区发送切换准备消息，并在接收到第二小区返回的切换准备失败的消息的同时，还包括：
当返回的切换准备失败的原因为容量原因，则在预定时间内，不再选取第二小区，并将第二小区的负荷状态设置为与第一负荷状态相反的第二负荷状态。
其中，获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组的步骤包括：
根据预先维护的源小区的各邻接小区之间的覆盖关系，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
在第二方面，本公开的实施例提供一种小区切换装置，包括：
获取模块，设置为获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组；
确定模块，设置为根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区；
指示模块，设置为指示UE从源小区切换至目标小区。
其中，确定模块包括：
第一获取子模块，设置为获取同覆盖邻接小区组中，负荷状态为第一负荷状态的切换备选邻区；
选取子模块，设置为从切换备选邻区中选取一第一小区作为目标小区。
其中，选取子模块包括：
第一选取单元，设置为从切换备选邻区中轮询选取一第一小区；
第一确定单元，设置为向选取的第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息后，确定第一小区为目标小区。
其中，选取子模块包括：
第二选取单元，设置为从切换备选邻区中任意选取一第二小区；
第一处理单元，设置为向选取的第二小区发送切换准备消息，并在接收到第二小区返回的切换准备失败的消息后，从切换备选邻区中任意选取一第一小区；
第二确定单元，设置为向第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息时，确定第一小区为目标小区。
其中，选取子模块还包括：
第二处理单元，设置为当返回的切换准备失败的原因为容量原因，则在预定时间内，不再选取第二小区，并将第二小区的负荷状态设置为与第一负荷状态相反的第二负荷状态。
其中，获取模块包括：
第二获取子模块，设置为根据预先维护的源小区的各邻接小区之间的覆盖关系，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
在第二方面，本公开的实施例提供一种计算机存储介质，所述计算机存储介质存储有执行指令，所述执行指令用于执行上述方法。
本公开的上述技术方案至少包括以下有益效果：
与现有技术相比，本公开实施例提供的小区切换方法及装置在很大程度上减少了一次不必要的切换，降低了***负荷，同时使UE能够迅速直接的切换到目标小区。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对本公开实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1表示目标侧为多个同覆盖小区的无线覆盖场景示意图；
图2表示在图1所示的无线覆盖场景中现有的小区切换示意图；
图3表示在图1所示的无线覆盖场景中本公开实施例的小区切换示意图；
图4表示本公开方法实施例提供的小区切换方法的流程示意图；
图5表示本公开方法实施例提供的小区切换方法的一具体实施示例；
图6表示本公开第一具体实施例的小区切换方法的信令示意图；
图7表示本公开第一具体实施例的小区切换方法的流程示意图；
图8表示本公开第二具体实施例的小区切换方法的信令示意图；
图9表示本公开第二具体实施例的小区切换方法的流程示意图；
图10表示本公开装置实施例提供的小区切换装置的结构示意图。
具体实施方式
为使本公开要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实 施例进行详细描述。
负荷均衡功能，是用来平衡小区间、频率间和无线接入技术之间的负荷。此功能可以平衡整个***的性能，提高***的稳定性。此功能是根据服务小区和其邻区负荷状态合理部署小区运行流量，并有效地使用***资源，以提高***的容量和提高***的稳定性。在一般情况下，负荷均衡功能可以被划分为三个阶段。
在测量阶段，持续监控和更新服务小区的负荷状态和相邻小区的负荷状态。如果存在X2接口，定期通过X2接口获取异站邻区负荷信息，或者通过内部消息获取同基站邻区负荷信息。如果UTRAN(UMTS Terrestrial Radio Access Network，UMTS陆地无线接入网)***支持RIM(RAN Information Management，无线接入网信息管理)过程，通过S1口的RIM过程获取UTRAN***邻区负荷信息。
在判决阶段，根据测量阶段收集的测量信息判断服务小区是否是处于高负荷状态。如果服务小区处于高负荷状态，负荷均衡执行阶段将被触发。否则，会重复进行负荷测量阶段和判决阶段。
在执行阶段，服务小区处于高负荷状态。服务小区中的某些用户设备被选中去执行A4(LTE内的负荷均衡)或B1(***间的负荷均衡)测量，根据UE的测量结果，将选出用于切换的UE切换到低负荷邻区。在盲切换的条件下，UE直接被切换到低负荷邻小区。无线资源的负荷，即小区的PRB(Physical Resource Block，物理资源块)利用率，是这个阶段进行负荷均衡唯一要考虑的负荷因素。
参见图1和图2，现有的小区切换方法中，在切换目标侧有同覆盖小区的场景下，很可能产生将UE从源小区切换到目标侧同覆盖小区中的小区1，然后根据负荷均衡，又将UE从小区1切换到小区2的情况，这样增加了一次无效切换，同时也浪费了宝贵的空口资源用于无效的切换信令传输。参见图3，为解决上述问题，本公开方法实施例提供一种小区切换方法，综合考虑测量和负荷均衡，直接将UE切换到满足条件的目标侧的小区，这样，可以在现有技术的基础上，减少UE的一次切换过程，降低***负荷，节约空口资源，提高用户的体验。
请参见图4，其示出的是本公开方法实施例提供的小区切换方法的流程示意图，本公开的实施例提供的小区切换方法，可以包括以下步骤：
步骤101，获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
这里，在确定对UE更换服务小区时，根据获取到的UE测量上报的邻接小区，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
步骤102，根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区。
这里，获取同覆盖邻接小区组内各小区的负荷状态，然后根据各小区的负荷状态从同覆盖邻接小区组中确定一个小区为目标小区。本实施例对于同覆盖邻接小区组内各小区的 负荷状态的获取方式不作限定，这里仅举例说明。例如，对于该同覆盖邻接小区组中属于同一基站的小区可以通过基站的内部消息获取小区的负荷状态；对于该同覆盖邻接小区组中属于不同基站的小区，当基站间配置了X2接口且传输正常时，可以通过X2接口获取同覆盖邻接小区组中异基站的小区的负荷状态，当基站间没有配置X2接口或X2接口故障，且同时支持RIM过程，可以通过S1接口的RIM过程获取同覆盖邻接小区组中异基站的小区的负荷状态。另外，需要说明的是，上述步骤102中确定的目标小区，是在同覆盖邻接小区组中，根据该同覆盖邻接小区组内各小区的负荷状态而确定的某一小区，并不一定是获取到的UE测量上报的邻接小区。
步骤103，指示UE从源小区切换至目标小区。
这里，上述步骤103属于现有流程，本实施例在此不作赘述。
在一实施例，步骤102中，根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区的步骤可以包括：
获取同覆盖邻接小区组中，负荷状态为第一负荷状态的切换备选邻区；
这里，小区的负荷状态包括第一负荷状态以及与该第一负荷状态相反的第二负荷状态，这里将第一负荷状态称为低负荷状态，第二负荷状态称为高负荷状态。通过该步骤，以将同覆盖邻接小区组中，负荷状态为低负荷状态的小区作为切换备选邻区。另外，可以将同覆盖邻接小区组中负荷状态为高负荷状态的小区设置为不可选取。
从切换备选邻区中选取一第一小区作为目标小区。
在一实施例中，上述从切换备选邻区中选取一第一小区作为目标小区的步骤可以包括：
从切换备选邻区中轮询选取一第一小区；
这里，采用轮询选取的策略从切换备选邻区中选取一个小区，即上述第一小区。另外，也可以采用任意选取的策略从切换备选邻区中选取一个小区。
向选取的第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息后，确定第一小区为目标小区。
这里，采用现有流程向选取的第一小区发送切换准备消息，并在接收到该第一小区返回的切换准备成功的消息后，将第一小区确定为目标小区，以执行上述步骤103。
在一实施例中，上述从切换备选邻区中选取一第一小区作为目标小区的步骤包括：
从切换备选邻区中任意选取一第二小区；
这里，采用任意选取的策略从切换备选邻区中选取一个小区，即上述第二小区。另外，也可以采用轮询选取的策略从切换备选邻区中选取一个小区。通过任意选取或者轮询选取的策略可以近似平均地将为源小区中需要进行小区切换的UE近乎平均地切换到同覆盖邻接小区组中的各小区。
向选取的第二小区发送切换准备消息，并在接收到第二小区返回的切换准备失败的消息后，从切换备选邻区中任意选取一第一小区；
这里，由于第二小区的负荷状态变化，或者其他原因，例如第二小区链路异常、RRC拥塞等，从而导致接收到第二小区返回切换准备失败的消息，此时，再次从切换备选邻区中任意选取一个小区。
向第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息时，确定第一小区为目标小区。
进一步的，在一实施例中，在向第二小区发送切换准备消息，并在接收到第二小区返回的切换准备失败的消息的同时，还包括以下步骤：
当返回的切换准备失败的原因为容量原因，则在预定时间内，不再选取第二小区，并将第二小区的负荷状态设置为与第一负荷状态相反的第二负荷状态。
这里，预先维护有一个因容量原因切换准备失败的标识，当返回的切换准备失败的原因为容量原因时，则触发该标识，在预定时间内，不再选取第二小区，并将第二小区的负荷状态设置为第二负荷状态，即高负荷状态。另外，该预定时间可以根据实际应用需求进行设置，例如，设置该预定时间为1分钟。
请参见图5，在一具体实施例中，以小区A为例，在与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组中存在该小区A，且已经从切换备选邻区中选取该小区A(此时，小区A的负荷状态为低负荷状态，且这里小区A为上述从切换备选邻区中任意选取的第二小区)。源小区向该小区A发送切换准备消息，在同一时间段内可能已有多个UE向小区A进行切换，或者其他可能发生负荷变化的原因，导致该小区A的负荷状态发生变化，此时，小区A返回切换准备失败的消息，且切换准备失败的原因为容量原因，即No radio resources available in target cell(在目标小区没有任何的可用无线资源)，这时，源小区在接收到该小区A返回的切换准备失败的消息时，触发预先维护的因容量原因切换准备失败的标识，将该小区A的负荷状态设置为高负荷状态，即将小区A设置为高负荷小区，并设置定时器定时1分钟(预定时间)，在该1分钟内不再选取该小区A，当定时器超时，则重新将该小区A的负荷状态设置为低负荷状态，即将小区A设置为低负荷小区。
另外，在一实施例中，在一段时间内，接收到某小区返回的切换准备失败的消息的次数达到以预定值时，降低该某小区的选取概率，其中，切换准备失败的原因不是容量原因。这里，在一段时间接收到某小区达到预定值的返回的切换准备失败消息的次数，则表示某小区异常，此时增加惩罚策略，降低某小区的选取概率。
其中，步骤101中，获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组的步骤可以包括：
根据预先维护的源小区的各邻接小区之间的覆盖关系，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
这里，源小区预先维护有各邻接小区之间的覆盖关系，并根据各邻接小区之间的覆盖关系设置有同覆盖邻接小区组。该各邻接小区之间的覆盖关系可以通过小区配置数据获 取。其中，可以为每一同覆盖邻接小区组设置一个组ID，以区分各同覆盖邻接小区组。
本公开方法实施例提供的小区切换方法，综合考虑测量和负荷均衡，直接将UE切换到满足条件的目标侧的小区，可以在很大程度上减少UE的无效切换过程，降低了***负荷，节约了空口资源，提高了用户的体验。
基于以上方法，本公开装置实施例提供了一种用以实现上述方法的装置。
参见图10，其示出的是本公开装置实施例提供的小区切换装置的结构示意图，本公开的装置实施例提供一种小区切换装置，包括：获取模块1010、确定模块1020以及指示模块1030。
获取模块1010，用于获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组；
确定模块1020，用于根据同覆盖邻接小区组内各小区的负荷状态，从同覆盖邻接小区组中确定一个小区为目标小区；
指示模块1030，用于指示UE从源小区切换至目标小区。
其中，确定模块1020包括：第一获取子模块和选取子模块。
第一获取子模块，用于获取同覆盖邻接小区组中，负荷状态为第一负荷状态的切换备选邻区；
选取子模块，用于从切换备选邻区中选取一第一小区作为目标小区。
其中，选取子模块包括：第一选取单元和第一确定单元。
第一选取单元，用于从切换备选邻区中轮询选取一第一小区；
第一确定单元，用于向选取的第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息后，确定第一小区为目标小区。
其中，选取子模块包括：第二选取单元、第一处理单元以及第二确定单元。
第二选取单元，用于从切换备选邻区中任意选取一第二小区；
第一处理单元，用于向选取的第二小区发送切换准备消息，并在接收到第二小区返回的切换准备失败的消息后，从切换备选邻区中任意选取一第一小区；
第二确定单元，用于向第一小区发送切换准备消息，并在接收到第一小区返回的切换准备成功的消息时，确定第一小区为目标小区。
进一步的，选取子模块还包括：第二处理单元。
第二处理单元，用于当返回的切换准备失败的原因为容量原因，则在预定时间内，不再选取第二小区，并将第二小区的负荷状态设置为与第一负荷状态相反的第二负荷状态。
其中，获取模块1010包括：第二获取子模块。
第二获取子模块，用于根据预先维护的源小区的各邻接小区之间的覆盖关系，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
上述装置实施例提供的小区切换装置与方法实施例提供的小区切换方法属于同一构思，其具体实现过程详见方法实施例，为避免重复，这里不再赘述。
本公开装置实施例提供的小区切换装置，综合考虑测量和负荷均衡，直接将UE切换到满足条件的目标侧的小区，可以在很大程度上减少UE的无效切换过程，降低了***负荷，节约了空口资源，提高了用户的体验。
最后，结合附图，再通过两个具体实施例对本公开进行更为详细的说明。
参见图6和图7，在第一具体实施例中，目标侧为多个同覆盖小区、源侧到目标侧无X2链路，源侧到目标侧的切换基于S1的切换。其中，图6中，Src eNB表示源小区所在基站。
步骤701，接收UE的测量报告。这里，UE通过Uu接口向源小区发送Measure Report(测量报告)，源小区根据接收的UE的测量报告获取UE测量上报的邻接小区。
步骤702，判断测量上报的邻接小区是否存在同覆盖小区。这里，即判断是否存在与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。当判断结果为是，执行步骤703，否则，流程结束。
步骤703，判断是否有小区处于高负荷状态。这里，对与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组内的各小区的负荷状态进行判断，当判断结果为是，执行步骤704，否则，执行步骤705。
步骤704，将高负荷状态的小区置为不可选取。
步骤705，随机选取一个同覆盖小区。这里，从同覆盖邻接小区组中随机选取一个同覆盖小区，源小区向该选取的同覆盖小区发送切换准备消息，具体的，通过所在基站(Src eNB)的S1接口向MME(Mobility Management Entity，移动管理实体)发送Handover Required(切换要求)消息，MME向选取的同覆盖小区(图6中的Dst eNB1Cell:2)所在的基站(Dst eNB1)通过S1接口发送Handover request(切换请求)消息；源小区在接收到选取的同覆盖小区返回的切换准备成功的消息后，将选取的同覆盖小区确定为目标小区，具体的，选取的同覆盖小区通过S1接口发送Handover Request Ack(切换请求证实)消息给MME，MME通过S1接口向源小区发送Handover Command(切换命令)消息，此时，将该选取的同覆盖小区确定为目标小区。在该实施例中不考虑目标小区返回切换准备失败的消息的情况。
步骤706，指示UE执行小区切换。这里，源小区向UE发送RRC Connection Reconfiguration(无线资源控制连接重配置)消息，UE向目标小区发送RRC connection reconfiguration complete(无线资源控制连接重配置完成)消息给目标小区，以完成接入目标小区。
参见图8和图9，在第二具体实施例中，目标侧为多个同覆盖小区、源侧到目标侧有X2链路且传输正常，源侧到目标侧的切换基于X2的切换。
步骤901，接收UE的测量报告。这里，UE通过Uu接口向源小区发送Measure Report(测量报告)，源小区根据接收的UE的测量报告获取UE测量上报的邻接小区(图8中的Dst Cell a)。
步骤902，判断UE测量上报的邻接小区是否存在同覆盖小区。这里，即判断是否存在与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。当判断结果为是，执行步骤903，否则，流程结束。
步骤903，判断是否有小区处在高负荷状态。这里，对与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组内的各小区的负荷状态进行判断，当判断结果为是，执行步骤904，否则，执行步骤905。
步骤904，将高负荷状态的小区置为不可选取。
步骤905，随机选取一个同覆盖小区。这里，从同覆盖邻接小区组中随机选取一个同覆盖小区，源小区向选取的同覆盖小区发送切换准备消息。具体的，参见图8，假定选取的同覆盖小区为小区b(图8中的Dst Cell b)，通过所在基站(Src eNB)的X2接口向小区b发送Handover Required消息。
步骤906，判断切换准备响应是否失败。这里，判断源小区接收到的切换准备响应是否为失败，若是，则执行步骤907，否则，执行步骤909。
步骤907，判断切换准备失败原因是否为容量原因。这里，判断切换准备失败的原因是否为容量原因，即原因是否为No radio resources available in target cell，若是，则执行步骤908，否则，重新执行步骤905。
步骤908，设置该同覆盖小区为高负荷小区。这里，在预定时间内该同覆盖小区的负荷状态设置为高负荷状态。
参见图8，上述步骤906至908中，小区b通过X2接口向源小区返回Handover Request Failure(切换请求失败)消息，则源小区重新选取一个同覆盖小区，即小区c(图8中的Dst Cell c)，源小区通过X2接口向小区c发送Handover Required消息，并在接收到小区c返回的切换准备成功的消息后，将小区c确定为目标小区，具体的，小区c通过X2接口发送Handover Request Ack消息给源小区，此时，将该小区c确定为目标小区。
步骤909，指示UE执行小区切换。这里，源小区通过Uu接口向UE发送RRC Connection Reconfiguration消息，UE向目标小区发送RRC connection reconfiguration complete消息给目标小区，以完成接入目标小区。
对于前述的方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本公开并不受所描述的动作顺序的限制，因为依据本公开，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作并不一定是本公开所必需的。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本公开的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
需要说明的是，在公开实施例中，诸如第一和第二等之类的关系术语仅仅用来将一个 实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本公开各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本公开各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述是本公开的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本公开所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本公开的保护范围。
工业实用性
本公开适用于通信领域，用以减少一次不必要的切换，降低***负荷，同时使UE能够迅速直接地切换到目标小区。

Claims (13)

  1. 一种小区切换方法，包括：
    获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组；
    根据所述同覆盖邻接小区组内各小区的负荷状态，从所述同覆盖邻接小区组中确定一个小区为目标小区；
    指示所述UE从所述源小区切换至所述目标小区。
  2. 根据权利要求1所述的小区切换方法，其中，所述根据所述同覆盖邻接小区组内各小区的负荷状态，从所述同覆盖邻接小区组中确定一个小区为目标小区的步骤包括：
    获取所述同覆盖邻接小区组中，负荷状态为第一负荷状态的切换备选邻区；
    从所述切换备选邻区中选取一第一小区作为目标小区。
  3. 根据权利要求2所述的小区切换方法，其中，所述从所述切换备选邻区中选取一第一小区作为目标小区的步骤包括：
    从所述切换备选邻区中轮询选取一第一小区；
    向选取的所述第一小区发送切换准备消息，并在接收到所述第一小区返回的切换准备成功的消息后，确定所述第一小区为目标小区。
  4. 根据权利要求2所述的小区切换方法，其中，所述从所述切换备选邻区中选取一第一小区作为目标小区的步骤包括：
    从所述切换备选邻区中任意选取一第二小区；
    向选取的所述第二小区发送切换准备消息，并在接收到所述第二小区返回的切换准备失败的消息后，从所述切换备选邻区中任意选取一第一小区；
    向所述第一小区发送切换准备消息，并在接收到所述第一小区返回的切换准备成功的消息时，确定所述第一小区为目标小区。
  5. 根据权利要求4所述的小区切换方法，其中，在向所述第二小区发送切换准备消息，并在接收到所述第二小区返回的切换准备失败的消息的同时，还包括：
    当返回的切换准备失败的原因为容量原因，则在预定时间内，不再选取所述第二小区，并将所述第二小区的负荷状态设置为与所述第一负荷状态相反的第二负荷状态。
  6. 根据权利要求1所述的小区切换方法，其中，所述获取与当前接入源小区的用户设备UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组的步骤包括：
    根据预先维护的所述源小区的各邻接小区之间的覆盖关系，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
  7. 一种小区切换装置，包括：
    获取模块，设置为获取与当前接入源小区的用户设备UE测量上报的邻接小区具 有同覆盖关系的同覆盖邻接小区组；
    确定模块，设置为根据所述同覆盖邻接小区组内各小区的负荷状态，从所述同覆盖邻接小区组中确定一个小区为目标小区；
    指示模块，设置为指示所述UE从所述源小区切换至所述目标小区。
  8. 根据权利要求7所述的小区切换装置，其中，所述确定模块包括：
    第一获取子模块，设置为获取所述同覆盖邻接小区组中，负荷状态为第一负荷状态的切换备选邻区；
    选取子模块，设置为从所述切换备选邻区中选取一第一小区作为目标小区。
  9. 根据权利要求8所述的小区切换装置，其中，所述选取子模块包括：
    第一选取单元，设置为从所述切换备选邻区中轮询选取一第一小区；
    第一确定单元，设置为向选取的所述第一小区发送切换准备消息，并在接收到所述第一小区返回的切换准备成功的消息后，确定所述第一小区为目标小区。
  10. 根据权利要求8所述的小区切换装置，其中，所述选取子模块包括：
    第二选取单元，设置为从所述切换备选邻区中任意选取一第二小区；
    第一处理单元，设置为向选取的所述第二小区发送切换准备消息，并在接收到所述第二小区返回的切换准备失败的消息后，从所述切换备选邻区中任意选取一第一小区；
    第二确定单元，设置为向所述第一小区发送切换准备消息，并在接收到所述第一小区返回的切换准备成功的消息时，确定所述第一小区为目标小区。
  11. 根据权利要求10所述的小区切换装置，其中，所述选取子模块还包括：
    第二处理单元，设置为当返回的切换准备失败的原因为容量原因，则在预定时间内，不再选取所述第二小区，并将所述第二小区的负荷状态设置为与所述第一负荷状态相反的第二负荷状态。
  12. 根据权利要求7所述的小区切换装置，其中，所述获取模块包括：
    第二获取子模块，设置为根据预先维护的所述源小区的各邻接小区之间的覆盖关系，获取与UE测量上报的邻接小区具有同覆盖关系的同覆盖邻接小区组。
  13. 一种计算机存储介质，所述计算机存储介质存储有执行指令，所述执行指令用于执行权利要求1至6中任一项所述的方法。
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