WO2014187389A1 - 小区切换方法及装置 - Google Patents
小区切换方法及装置 Download PDFInfo
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- WO2014187389A1 WO2014187389A1 PCT/CN2014/079183 CN2014079183W WO2014187389A1 WO 2014187389 A1 WO2014187389 A1 WO 2014187389A1 CN 2014079183 W CN2014079183 W CN 2014079183W WO 2014187389 A1 WO2014187389 A1 WO 2014187389A1
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- cell
- handover
- target cell
- handover target
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- 238000000034 method Methods 0.000 title claims abstract description 253
- 230000008569 process Effects 0.000 claims abstract description 87
- 230000000977 initiatory effect Effects 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 149
- 238000002360 preparation method Methods 0.000 claims description 97
- 238000012790 confirmation Methods 0.000 claims description 30
- 239000003550 marker Substances 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 15
- 238000010586 diagram Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 9
- 230000011664 signaling Effects 0.000 description 7
- 230000003993 interaction Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 239000000872 buffer Substances 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 101100465000 Mus musculus Prag1 gene Proteins 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/249—Reselection being triggered by specific parameters according to timing information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
- H04W36/362—Conditional handover
Definitions
- the present invention relates to the field of communications, and in particular to a cell handover method and apparatus.
- BACKGROUND With the popularization of smart phones, people can use a smart phone to connect to the Internet at any time and any place.
- Typical data services such as QQ chat, Weibo, and WeChat have become an indispensable part of most people's daily lives.
- smartphones bring fun and convenience to people's lives, they also increase the amount of data traffic, especially in densely populated locations such as commercial centers and residential areas.
- Single cell planning has been difficult and steeply growing. The quantity matches, which seriously affects the user experience.
- 3GPP proposed the HetNet topic, which is to add micro cells in the existing macro cell, thereby increasing the capacity of the network to meet the increasing amount of packet data.
- a series of new problems have been introduced at the same time as the introduction of micro cells, and the robustness of switching between macro cells and micro cells is one of the representative problems.
- a complete cell handover involves both the control plane process and the user plane process of the UE.
- the control plane process mainly involves signaling interaction in handover, and the user plane process mainly involves forwarding of user data.
- the control plane process and user plane process are described separately below.
- the control plane process involved in the switch mainly includes the following steps:
- the RRC (Radio Resource Control) layer of the UE performs layer 3 filtering on the neighboring cell signal measurement result reported by the physical layer, and compares the filtered value with the signal strength measurement result of the current serving cell of the UE. To determine whether the entry condition of the A3 event (one of the measurement events) can be satisfied, if the entry condition of the A3 event is satisfied, the TTT (Time-To-Trigger) timer is started.
- the TTT Time-To-Trigger
- the UE still measures and compares the neighbor signals. If the neighboring cell strength measurement reported by the physical layer filtered by the layer 3 satisfies the entry condition of the A3 event during the running of the timer, the UE sends the eNodeB (source eNodeB) of the serving cell after the TTT timer expires. MR (Measurement Report) (including measurement results of the serving cell and neighboring cells). (3) After receiving the MR, the current serving cell (source cell) of the UE initiates a handover preparation process for the cell included in the MR.
- the source cell receives the HO CMD (Handover Command) sent by the cell (ie, the handover target cell) through the X2 interface (ie, the RRC generated by the handover target cell)
- the Connection Reconfiguration Msg includes radio resource configuration information required when the UE switches to the handover target cell.
- the source cell sends a HO CMD to the UE.
- the UE After receiving the HO CMD sent by the source cell, the UE initiates a random access procedure to the handover target cell. (6) After the UE completes the access to the handover target cell, the handover target cell initiates with the MME (Mobility)
- the Path Switch process between the Management Entity and the Mobility Management Entity which triggers the bearer modification process between the MME and the S-GW (Serving Gateway).
- the handover target cell base station sends a UE Context Release Msg to the source cell base station to release the radio resources associated with the UE.
- the user plane process involved in switching involves the following steps:
- the source cell base station After transmitting the HO CMD, the source cell base station starts to forward the user plane data of the UE to the handover target cell base station, and at this time, the handover target cell base station buffers the received user plane data.
- the UE and the handover target cell start the interaction of the user plane data, that is, the radio bearer directly between the UE and the handover target cell has been established.
- the source cell base station starts the user plane data interaction at the S-GW, that is, the bearer establishment between the two is completed.
- the RLC (Radio Link Control) layer and the physical layer in the radio interface protocol stack respectively adopt an ARQ (Automatic Repeat Request) Mechanism and HARQ (Hybrid ARQ, hybrid automatic repeat request) mechanism to ensure the correct reception of signaling and data.
- ARQ Automatic Repeat Request
- HARQ Hybrid ARQ, hybrid automatic repeat request
- the ARQ mechanism sends a Polling bit to the receiving end to trigger the receiving end to feed back the STATUS Report to the transmitting end, so that the transmitting end determines whether the receiving end has correctly received data.
- the receiving end will The Ack/Nack is fed back to the transmitting end, so that the transmitting end determines whether the receiving end has correctly received the data.
- the UE moves from the macro cell to the micro cell
- the signal strength of the micro cell ie, the handover target cell
- the UE may go deep into the micro cell, so that the interference of the micro cell is too large to receive the HO CMD or the HO CMD sent by the source cell, which may cause the handover to fail.
- the robustness of the UE handover affects the performance of the network. Moreover, the above situation is more obvious when the UE runs faster.
- Embodiments of the present invention provide a cell handover method and apparatus to solve at least the above problems.
- a cell handover method is provided, which is applied to a user equipment UE side, and the method includes: when a predetermined handover trigger condition is met, the user equipment UE sends handover notification information to the source cell; The cell configuration of the handover target cell is prepared, and the handover target cell is determined, where the handover target cell is prepared to be a cell that the UE can handover; the UE initiates a handover process to the handover target cell.
- the predetermined handover triggering condition includes at least one of the following: an entry condition of the predetermined measurement event; the predetermined measurement event satisfies the reporting condition; the indication information sent by the source cell is received; and the indication information sent by the neighboring cell of the source cell is received.
- the handover notification information includes at least one of the following: cell identification information that satisfies the measurement event entry condition; cell type information that satisfies the measurement event entry condition; measurement result of the cell that satisfies the measurement event entry condition; and measurement result of the source cell.
- the cell configuration comprises: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the handover target cell.
- the UE determines the handover target cell in the following manner: The UE determines the handover target cell according to the measurement result obtained during the performing cell measurement operation.
- the determining, by the UE, the handover target cell according to the measurement result includes: the UE selects, as the handover target cell, the cell with the best measurement result in the prepared handover target cell according to the cell configuration; or, the UE reaches the predetermined threshold according to the cell configuration.
- the value of the prepared handover target cell is randomly selected in one cell as the handover target cell.
- the UE selects the cell with the strongest selection signal from the prepared handover target cell. Switch the target cell.
- the UE initiates a handover procedure to the handover target cell, including: the UE sends the handover target cell information to the source cell, and initiates a handover process to the handover target cell after receiving the success confirmation information of the source cell feedback for indicating successful reception.
- the UE sends the handover target cell information to the source cell, and initiates a handover process to the handover target cell; or, the UE directly initiates a handover procedure to the handover target cell.
- determining, by the UE, the handover target cell according to the measurement result includes: the UE uses the cell with the best measurement result as the handover target cell, and the cell with the best measurement result is prepared to switch the cell in the target cell or is prepared to switch the target cell. Community.
- the UE initiates a handover procedure to the handover target cell, including: if the handover target cell determined by the UE belongs to the prepared handover target cell, the UE sends the handover target cell information to the source cell, and receives the source cell feedback for indicating After receiving the successful success confirmation information, the handover process is initiated to the handover target cell; or the UE sends the handover target cell information to the source cell, and initiates a handover procedure to the handover target cell; or the UE directly initiates a handover procedure to the handover target cell; The UE determines that the handover target cell is not ready to handover the target cell, and then the UE sends the handover target cell information to the source cell, and after receiving the handover command sent by the source cell, initiates a handover procedure according to the handover command.
- the handover target cell information includes at least one of the following: an identifier of the handover target cell, and a signal strength measurement result of the handover target cell.
- the success confirmation information includes at least one of the following information: a hybrid automatic repeat request acknowledgement HARQ-Ack indication sent by the physical layer of the source cell; a radio link of the source cell controls a state of the measurement result of the handover target cell sent by the RLC layer Report STATUS Report.
- the method further includes:: the UE does not receive the success confirmation information, or receives the failure confirmation information indicating that the reception fails, and the UE confirms that the source cell does not successfully receive the handover target.
- a cell handover apparatus located in a user equipment UE, the apparatus includes: a sending module, configured to send handover notification information to a source cell when a predetermined handover trigger condition is met; And setting, to receive the cell configuration of the prepared handover target cell sent by the source cell, and determining the handover target cell, where the handover target cell is prepared to be a cell that the UE can switch; and the initiating module is configured to initiate a handover process to the handover target cell.
- a cell handover method is provided, which is applied to a user equipment UE side, where the method includes: a user equipment UE receives a cell configuration of a prepared handover target cell that is sent by a source cell, where The handover target cell is prepared to be a cell that the UE can handover; the UE determines the handover target cell; the UE initiates a handover procedure to the handover target cell.
- the cell configuration comprises: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the handover target cell.
- the UE determines the handover target cell in the following manner: The UE determines the handover target cell according to the measurement result obtained during the performing the cell measurement operation.
- the determining, by the UE, the handover target cell according to the measurement result includes: the UE selects, as the handover target cell, the cell with the best measurement result in the prepared handover target cell according to the cell configuration; or, the UE reaches the predetermined threshold according to the cell configuration.
- the value of the prepared handover target cell is randomly selected in one cell as the handover target cell. If the measurement result of the prepared handover target cell does not reach the predetermined threshold, the UE selects the cell with the strongest selection signal from the prepared handover target cell. Switch the target cell.
- the UE initiates a handover procedure to the handover target cell, including: the UE sends the handover target cell information to the source cell, and initiates a handover process to the handover target cell after receiving the success confirmation information of the source cell feedback for indicating successful reception. Or, the UE sends the handover target cell information to the source cell, and initiates a handover process to the handover target cell; or, the UE directly initiates a handover procedure to the handover target cell.
- determining, by the UE, the handover target cell according to the measurement result includes: the UE uses the cell with the best measurement result as the handover target cell, and the cell with the best measurement result is prepared to switch the cell in the target cell or is prepared to switch the target cell.
- the UE initiates a handover procedure to the handover target cell, including: if the handover target cell determined by the UE belongs to the prepared handover target cell, the UE sends the handover target cell information to the source cell, and receives the source cell feedback for indicating After receiving the successful success confirmation information, the handover process is initiated to the handover target cell; or the UE sends the handover target cell information to the source cell, and initiates a handover procedure to the handover target cell; or the UE directly initiates a handover procedure to the handover target cell; If the handover target cell determined by the UE does not belong to the prepared handover target cell, the UE sends the handover target cell information to the source cell, and after receiving the handover command sent by the source cell, initiates the handover procedure according to the handover command.
- the handover target cell information includes at least one of the following: an identifier of the handover target cell, and a signal strength measurement result of the handover target cell.
- the success confirmation information includes at least one of the following information: a hybrid automatic repeat request acknowledgement HARQ-Ack indication sent by the physical layer of the source cell; a radio link of the source cell controls a state of the measurement result of the handover target cell sent by the RLC layer Report STATUS Report.
- the method further includes:: the UE does not receive the success confirmation information, or receives the failure confirmation information indicating that the reception fails, and the UE confirms that the source cell does not successfully receive the handover target.
- a cell switching apparatus which is located in a user equipment UE, and includes: a receiving module, configured to receive a cell configuration of a prepared handover target cell sent by a source cell, where The target cell is a cell that the UE can switch; the determining module is configured to determine a handover target cell; and the initiating module is configured to initiate a handover process to the handover target cell.
- a cell handover method which is applied to a network side, and the method includes: a source cell performing a handover preparation operation, where a source cell is a serving cell of a user equipment UE; The result of the operation is to generate a cell configuration in which the handover target cell is prepared, wherein the handover target cell is prepared to be a cell that the UE can handover; the source cell sends the cell configuration to the UE; and the source cell forwards the user data of the UE to the handover target cell.
- the UE performs a handover preparation operation according to at least one of the following information: handover notification information sent by the UE; mobility statistics information of the UE obtained by the source cell; load information of the source cell; indication information of other cells received by the source cell, The other cell is a neighboring cell of the source cell.
- the source cell adopts one of the following manners: the source cell sends a predetermined number of cells in the cell included in the handover notification information according to the handover notification information.
- the source cell sends a handover preparation procedure between the cell with the best measurement result in the cell included in the handover cell and the handover notification information according to the handover notification information; the source cell sends the origin cell and the handover notification information according to the handover notification information.
- the cell configuration comprises: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the handover target cell.
- the source cell forwards the user data of the UE to the handover target cell, and includes the following manner: After the source cell successfully receives the measurement result obtained by the UE sent by the UE to measure the handover target cell, the user equipment forwards the user data to the handover target cell. After receiving the data forwarding indication information sent by the handover target cell, the source cell Forwarding user data to the handover target cell; after receiving the termination marker (End Marker) sent by the serving gateway, the source cell forwards the user data to the handover target cell.
- the termination marker End Marker
- a cell handover apparatus where a source cell is a serving cell of a user equipment UE, and the apparatus includes: an execution module, configured to perform a handover preparation operation; a generating module, configured to generate a cell configuration of the prepared handover target cell according to the result of the handover preparation operation, where the handover target cell is prepared to be a cell that the UE can switch; the sending module is configured to send the cell configuration to the UE; It is set to forward the user data of the UE to the handover target cell.
- a cell handover method which is applied to a network side, where the method includes: a source cell performs a handover preparation operation, where a source cell is a serving cell of a user equipment UE; The result of the operation is to generate a cell configuration in which the handover target cell is prepared, where the handover target cell is prepared to be a cell that the UE can switch; the source cell sends the cell configuration to the UE; and the source cell receives the handover target cell information sent by the UE.
- the source cell determines whether the handover target cell belongs to the prepared handover target cell, and if the determination result is no, sends a handover command to the UE, where the handover target cell information includes: the identifier of the handover target cell and/or the signal strength of the handover target cell Measurement result; the source cell forwards the user data of the UE to the handover target cell.
- the UE performs a handover preparation operation according to at least one of the following information: handover notification information sent by the UE; mobility statistics information of the UE obtained by the source cell; load information of the source cell; indication information of other cells received by the source cell, The other cell is a neighboring cell of the source cell.
- the source cell when the source cell performs the handover preparation operation according to the handover notification information, the source cell adopts one of the following manners: the source cell sends a predetermined number of cells in the cell included in the handover notification information according to the handover notification information. a handover preparation process; the source cell sends a handover preparation procedure between the cell with the best measurement result in the cell included in the handover cell and the handover notification information according to the handover notification information; the source cell sends the origin cell and the handover notification information according to the handover notification information.
- the cell configuration comprises: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the prepared target cell.
- the source cell forwards the user data of the UE to the handover target cell, including one of the following manners: after the source cell successfully receives the handover target cell information sent by the UE, the source cell forwards the user data to the handover target cell; the source cell receives the handover. After the data forwarding indication information sent by the target cell, the user data is forwarded to the handover target cell; after receiving the termination marker (End Marker) sent by the serving gateway, the source cell forwards the user data to the handover target cell.
- End Marker termination marker
- a cell switching apparatus where a source cell is a serving cell of a user equipment UE, and the apparatus includes: an execution module, configured to perform a handover preparation operation; a generating module, configured to generate a cell configuration of the prepared handover target cell according to the result of the handover preparation operation, where the handover target cell is prepared to be a cell that the UE can switch; the sending module is configured to send the cell configuration to the UE; and the processing module If the handover target cell information that is sent by the UE is received, it is determined whether the handover target cell belongs to the prepared handover target cell, and if the determination result is no, the handover command is sent to the UE, where the handover target cell information includes: The identifier of the cell and/or the signal strength measurement result of the handover target cell; the forwarding module is configured to forward the user data of the UE to the handover target cell.
- the UE when the UE or the network side triggers the cell handover mechanism, the UE may determine the handover target cell according to the configuration information that the source cell can transmit the handover cell, and then initiate the cell handover process by the UE or the network side.
- the method solves the problem that the method for performing cell handover according to the current protocol in the related art is likely to have a serious impact on the robustness of the UE handover, thereby achieving the effect of effectively ensuring the handover robustness between the macro cell and the micro cell.
- FIG. 1 is a block diagram of a cell handover method according to a first embodiment of the present invention
- FIG. 2 is a block diagram of a cell handover apparatus according to a first embodiment of the present invention
- FIG. 3 is a cell handover according to a second embodiment of the present invention
- FIG. 4 is a block diagram of a cell switching apparatus according to Embodiment 2 of the present invention
- FIG. 5 is a flowchart of a cell switching method according to Embodiment 3 of the present invention
- FIG. 6 is a cell switching apparatus according to Embodiment 3 of the present invention
- FIG. 7 is a block diagram of a cell handover method according to Embodiment 4 of the present invention
- FIG. 8 is a block diagram of a cell handover apparatus according to Embodiment 4 of the present invention
- FIG. 5 is a flowchart of a cell switching method according to Embodiment 3 of the present invention
- FIG. 6 is a cell switching apparatus according to Embodiment 3 of the present invention
- FIG. 7 is a block diagram of a cell handover method according to Embodiment 4 of the present invention
- FIG. 8 is a block diagram of a cell handover apparatus according to Embodiment 4 of the present invention
- FIG. 9 is a cell handover according to a preferred embodiment 1 of the present invention.
- Flow chart Figure 10 is a flow chart of cell handover in accordance with a preferred embodiment 2 of the present invention;
- Figure 11 is a flow chart of cell handover in accordance with a preferred embodiment 3 of the present invention;
- Figure 12 is a flow chart of cell handover in accordance with a preferred embodiment 4 of the present invention.
- Embodiment 1 The first embodiment of the present invention provides a cell handover method, which can be applied to a UE side of a user equipment.
- 1 is a flowchart of a cell handover method according to Embodiment 1 of the present invention. As shown in FIG. 1, the method mainly includes the following steps (Step S102 - Step S106): Step S102: When a predetermined handover trigger condition is met, the user equipment The UE sends the handover notification information to the source cell.
- Step S104 The UE receives the cell configuration of the prepared handover target cell that is sent by the source cell, and determines the handover target cell, where the prepared handover target cell is a cell that the UE can switch; The UE initiates a handover procedure to the handover target cell.
- the UE may determine the handover target cell according to the UE cell configuration sent by the source cell or according to the cell measurement result, and then the UE initiates the cell handover process, thereby effectively ensuring the handover robustness between the macro cell and the micro cell.
- the predetermined handover trigger condition may include at least one of: an entry condition of a predetermined measurement event; a predetermined measurement event satisfies a reporting condition; receiving indication information sent by the source cell; and receiving, by the neighboring cell of the source cell, Instructions.
- the handover notification information may include at least one of the following: cell identification information that satisfies the measurement event entry condition; cell type information that satisfies the measurement event entry condition; measurement result of the cell that satisfies the measurement event entry condition; Measurement results.
- the cell configuration may include: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the handover target cell.
- the UE may determine the handover target cell by using the following manner: The UE determines the handover target cell according to the measurement result obtained during the performing cell measurement operation.
- the UE may determine, according to the measurement result, that the handover target cell may include: the UE selects a cell with the best measurement result in the prepared handover target cell as the handover target cell according to the cell configuration; or, the UE measures according to the cell configuration.
- the prepared handover target cell that reaches the predetermined threshold is randomly selected as one handover target cell. If the measurement result of the handover target cell has not reached the predetermined threshold, the UE selects a signal from the prepared handover target cell. The strongest cell serves as the handover target cell.
- the step S106 may be implemented in the following manner: the UE sends the handover target cell information to the source cell, and after receiving the success confirmation information indicating the success of the source cell feedback, the UE initiates the handover target cell.
- the handover process or, the UE sends the handover target cell information to the source cell, and initiates a handover process to the handover target cell; or, the UE directly initiates a handover procedure to the handover target cell.
- the UE determines, according to the measurement result, that the handover target cell can be used in the following manner: the UE uses the cell with the best measurement result as the handover target cell, and the cell with the best measurement result is ready to handover the cell in the target cell or It is ready to switch cells other than the target cell.
- the UE initiates a handover procedure to the handover target cell, which may be implemented as follows: If the handover target cell determined by the UE belongs to the prepared handover target cell, the UE sends the handover target cell information to the source cell, and receives the source.
- the handover process is initiated to the handover target cell; or the UE sends the handover target cell information to the source cell and initiates a handover process to the handover target cell; The cell initiates a handover process. If the handover target cell determined by the UE is not ready to handover the target cell, the UE sends the handover target cell information to the source cell, and after receiving the handover command sent by the source cell, initiates a handover procedure according to the handover command.
- the handover target cell information includes at least one of the following: an identifier of the handover target cell, and a signal strength measurement result of the handover target cell.
- the success confirmation information includes at least one of the following information: a hybrid automatic repeat request acknowledgement HARQ-Ack indication sent by the physical layer of the source cell; a radio link of the source cell controls a state of the measurement result of the handover target cell sent by the RLC layer Report STATUS Report.
- the method may further include: after the UE does not receive the success confirmation information, or receives the failure confirmation information indicating that the reception fails, and the UE confirms that the source cell is not
- the UE performs one of the following operations: stopping the handover process; The handover process is stopped, and the radio resource control connection re-establishment process is initiated; the handover process is initiated directly to the handover target cell.
- the first embodiment of the present invention provides a cell handover apparatus, which is located in a user equipment UE, and is used to implement the cell handover method provided in the first embodiment.
- the apparatus may include: a sending module 22, a processing module 24, and an initiating module 26.
- the sending module 22 is configured to: when the predetermined handover trigger condition is met, send the handover notification information to the source cell;
- the processing module 24 is configured to receive the cell configuration of the prepared handover target cell that is sent by the source cell, and determine the handover target cell.
- the preparation target unit 26 is configured to initiate a handover procedure to the handover target cell.
- the second embodiment of the present invention provides a cell handover method, which can be applied to the UE side of the user equipment.
- Step S302 The user equipment UE receives the prepared handover sent by the source cell. a cell configuration of the target cell, where the handover target cell is prepared to be a cell that the UE can handover; in step S304, the UE determines the handover target cell; and in step S306, the UE initiates a handover process to the handover target cell.
- the cell configuration may include: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the handover target cell.
- the UE may determine the handover target cell by using the following manner: The UE determines the handover target cell according to the measurement result obtained during the performing cell measurement operation.
- the determining, by the UE, the handover target cell according to the measurement result may be implemented in the following manner: the UE selects a cell with the best measurement result in the prepared handover target cell as the handover target cell according to the cell configuration; or, the UE configures the cell according to the cell configuration.
- step S306 may be implemented as follows: the UE sends the handover target cell information to the source cell, and after receiving the success confirmation information for indicating the success of the source cell feedback, the UE initiates the handover target cell.
- the handover process or, the UE sends the handover target cell information to the source cell, and initiates a handover process to the handover target cell; or, the UE directly initiates a handover procedure to the handover target cell.
- the UE determines, according to the measurement result, that the handover target cell can be implemented in the following manner: the UE uses the cell with the best measurement result as the handover target cell, and the cell with the best measurement result is prepared to switch the cell in the target cell or It is ready to switch cells other than the target cell.
- step S306 may be implemented as follows: If the handover target cell determined by the UE belongs to the reserved handover target cell, the UE sends the handover target cell information to the source cell, and receives the source cell feedback for indicating reception. After the successful success of the confirmation information, the handover process is initiated to the handover target cell; or the UE sends the handover target cell information to the source cell and initiates a handover procedure to the handover target cell; or the UE directly initiates a handover procedure to the handover target cell.
- the UE sends the handover target cell information to the source cell, and after receiving the handover command sent by the source cell, initiates a handover procedure according to the handover command.
- the handover target cell information includes at least one of the following: an identifier of the handover target cell, and a signal strength measurement result of the handover target cell.
- the success confirmation information includes at least one of the following information: a hybrid automatic repeat request acknowledgement HARQ-Ack indication sent by the physical layer of the source cell; a radio link of the source cell controls a state of the measurement result of the handover target cell sent by the RLC layer Report STATUS Report.
- the method may further include: after the UE does not receive the success confirmation information, or receives the failure confirmation information indicating that the reception fails, and the UE confirms that the source cell is not If the handover target cell information is successfully received, the UE performs one of the following operations: stopping the handover process; stopping the handover process, and initiating the radio resource control connection reestablishment process; directly initiating the handover process to the handover target cell.
- a second embodiment of the present invention provides a cell switching apparatus, which is located in a user equipment UE, and is used to implement the cell handover method provided in the foregoing Embodiment 2.
- the apparatus may include: a receiving module 42, a determining module 44, and an initiating module 46.
- the receiving module 42 is configured to receive a cell configuration of the prepared handover target cell that is sent by the source cell, where the handover target cell is prepared to be a cell that the UE can switch; the determining module 44 is configured to determine the handover target cell; , set to initiate a handover process to the handover target cell.
- Embodiment 3 The third embodiment of the present invention provides a cell handover method, which can be applied to the network side. 5 is a flowchart of a cell handover method according to Embodiment 3 of the present invention.
- Step S502 The source cell performs a handover preparation operation, where the source cell Is a serving cell of the user equipment UE; Step S504, the source cell generates a cell configuration of the handover target cell according to the result of the handover preparation operation, where the handover target cell is prepared to be a cell that the UE can handover; Step S506, the source cell will be the cell The configuration is sent to the UE.
- Step S508 The source cell forwards the user data of the UE to the handover target cell.
- the UE may perform a handover preparation operation according to at least one of the following information: handover notification information sent by the UE; mobility statistics of the UE obtained by the source cell; load information of the source cell; other cells received by the source cell The indication information, where the other cell is a neighboring cell of the source cell.
- handover notification information sent by the UE
- mobility statistics of the UE obtained by the source cell load information of the source cell
- other cells received by the source cell The indication information, where the other cell is a neighboring cell of the source cell.
- the source cell performs the handover preparation operation according to the handover notification information
- one of the following manners may be adopted: the source cell sends a predetermined number of cells in the origin cell and the handover notification information according to the handover notification information.
- the source cell sends a handover preparation procedure between the origin cell and the cell with the best measurement result in the cell included in the handover notification information according to the handover notification information; the source cell sends the origin cell according to the handover notification information.
- the handover preparation process between cells of a predetermined type in the cell included in the handover information is switched.
- the cell configuration may include: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the handover target cell.
- the source cell forwards the user data of the UE to the handover target cell, and may adopt one of the following manners: After the source cell successfully receives the handover target cell information sent by the UE, the source cell forwards the user data to the handover target cell; After receiving the data forwarding indication information sent by the handover target cell, the user data is forwarded to the handover target cell. After receiving the termination marker (End Marker) sent by the serving gateway, the source cell forwards the user data to the handover target cell.
- a third embodiment of the present invention provides a cell handover apparatus, where a source cell located on the network side (the source cell is a serving cell of the user equipment UE) is configured to implement the cell handover method provided in the foregoing Embodiment 3.
- the apparatus may include: an execution module 62, a generating module 64, a sending module 66, and a forwarding module 68.
- the execution module 62 is configured to perform a switch preparation operation
- the generating module 64 is configured to generate a prepared handover target cell according to the result of the handover preparation operation.
- the cell configuration, where the handover target cell is prepared is a cell that the UE can switch;
- the sending module 66 is configured to send the cell configuration to the UE, and the forwarding module 68 is configured to forward the UE user data to the handover target cell.
- FIG. 7 is a flowchart of a cell handover method according to Embodiment 4 of the present invention.
- the method mainly includes the following steps (Step S702-Step S710): Step S702: A source cell performs a handover preparation operation, where a source cell Is a serving cell of the user equipment UE; Step S704, the source cell generates a cell configuration in which the handover target cell is prepared according to the result of the handover preparation operation, where the handover target cell is prepared to be a cell that the UE can handover; Step S706, the source cell is a cell The configuration is sent to the UE.
- Step S708 If the source cell receives the handover target cell information sent by the UE, the source cell determines whether the handover target cell belongs to the prepared handover target cell, and if the determination result is no, sends a handover command to the UE. And the switching target cell information includes: switching the identifier of the target cell and/or the signal strength measurement result of the handover target cell; Step S710: The source cell forwards the user data of the UE to the handover target cell.
- the UE may perform a handover preparation operation according to at least one of the following information: handover notification information sent by the UE; mobility statistics of the UE obtained by the source cell; load information of the source cell; other cells received by the source cell The indication information, where the other cell is a neighboring cell of the source cell.
- handover notification information sent by the UE
- mobility statistics of the UE obtained by the source cell load information of the source cell
- other cells received by the source cell The indication information, where the other cell is a neighboring cell of the source cell.
- the source cell performs the handover preparation operation according to the handover notification information
- one of the following manners may be adopted: the source cell sends a predetermined number of cells in the origin cell and the handover notification information according to the handover notification information.
- the source cell sends a handover preparation procedure between the origin cell and the cell with the best measurement result in the cell included in the handover notification information according to the handover notification information; the source cell sends the origin cell according to the handover notification information.
- the cell configuration may include: a predetermined number of identifiers of the prepared handover target cell, and radio resource configuration information required by the UE to initiate a handover procedure to the prepared target cell.
- the source cell forwards the user data of the UE to the handover target cell, and may be in the following manner: After the source cell successfully receives the handover target cell information sent by the UE, the source cell forwards the information to the handover target cell. User data; after receiving the data forwarding indication information sent by the handover target cell, the source cell forwards the user data to the handover target cell; after receiving the termination marker (End Marker) sent by the serving gateway, the source cell forwards the user to the handover target cell. data.
- a fourth embodiment of the present invention provides a cell handover apparatus, where a source cell located on the network side (the source cell is a serving cell of the user equipment UE) is configured to implement the cell handover method provided in the foregoing fourth embodiment.
- the apparatus may include: an execution module 80 configured to perform a handover preparation operation; and a generation module 82 configured to perform an operation according to the handover preparation
- a cell configuration in which the handover target cell is prepared is generated, wherein the handover target cell is prepared to be a cell that the UE can switch;
- the sending module 84 is configured to send the cell configuration to the UE;
- the processing module 86 is configured to receive the UE.
- the target cell information is switched, it is determined whether the handover target cell belongs to the prepared handover target cell, and if the determination result is no, the handover command is sent to the UE, where the handover target cell information includes: the identity of the handover target cell and/or the handover target The signal strength measurement result of the cell; the forwarding module 88 is configured to forward the user data of the UE to the handover target cell.
- the UE may determine the handover target cell according to the configuration information that the source cell can transmit the handover cell, and then the UE or the network.
- the user equipment UE is in the environment of cell A, cell B, cell C, cell D and cell E, respectively.
- the cell A is the serving cell of the UE, and the remaining four cells are the neighboring cell of the cell A and the micro cell (cell B) inside the cell A.
- the physical layer of the UE performs measurement on all the cells that can be detected, and initiates a handover process according to the measurement result.
- the specific steps are as follows: Step 1: The UE performs measurement on all cells that can be detected by the UE. When a cell meets a measurement event (for example,
- the UE When the entry condition of the A3 event), the UE starts the TTT timer and transmits handover notification information to the cell A.
- the cells that simultaneously satisfy the A3 event entry condition are: cell B, cell C, and cell D.
- the information included in the handover notification information sent by the UE is any combination of the following information: identity information of cells B, C, and D, type information of cells B, C, and D, cells B, C, and The measurement result of D, the measurement result of the cell A.
- Step 2 The cell A receives the handover notification information sent by the UE, and performs a handover preparation process according to the information. In this embodiment, the cell A performs the handover preparation process according to the handover notification information as one of the following situations:
- the cell A initiates a handover preparation process with all cells included in the information according to the handover notification information, that is, initiates a handover preparation process with the cells B, C, and D, respectively;
- the cell A initiates a handover preparation process with a predetermined number of cells with the best measurement result according to the handover notification information, that is, initiates the cell with the best measurement result in the cells B, C, and D, or the measurement result is the most Good handover preparation process between several cells;
- the cell A initiates a handover preparation procedure with a predetermined type of cell according to the handover notification information, that is, initiates a handover preparation procedure with the cell B, or initiates a handover preparation procedure with the cell C and the cell D.
- Step 3 The cell A generates a cell configuration that is ready to handover the target cell, and sends it to the UE.
- the cell configuration of the prepared handover target cell generated by the base station of the cell A includes a predetermined number of identifiers of the cells involved in the handover preparation process, and radio resources required when the UE switches to the cells. Configuration. The number of reservations may be only one cell, or part of a cell, or all cells.
- the base station of the cell A only includes part or all of the result of the handover preparation process in the cell configuration in which the handover target cell is prepared, and the UE is to determine the handover target cell.
- Step 4 The UE receives the cell configuration that has been prepared to handover the target cell, and determines the handover target cell.
- the UE determines the handover target cell according to the measurement result of the cell
- the method for determining the handover target cell may be one of the following methods: (1) if the cell configuration of the target cell is prepared to include only information of one cell, Then the UE sets the cell as a handover target cell; (2) If the cell configuration of the target cell is prepared to include information of multiple cells, the UE sets the cell with the best measurement result among the cells as the handover target cell, that is, the UE selects the most of the cells B, C, and D. The strong cell is set to switch the target cell;
- the UE performs random selection in the cell that has been prepared for the cell configuration of the target cell and whose measurement result reaches a predetermined threshold, and determines the selected cell as the handover target cell, if the measurement results of all the cells are not reached. For a predetermined threshold, the UE selects the cell with the best measurement result as the handover target cell.
- the cell may be a handover target cell designated by the network to the UE.
- the UE may determine the handover target cell in one of two time points: (1) after receiving the potential handover target cell configuration, the UE immediately determines the handover target cell;
- Step 5 The UE sends the handover target cell information to the cell A, and waits for the feedback confirmation information of the cell A.
- the UE sends the handover target cell information to the cell A, where the handover target cell information is the identifier of the handover target cell. Any combination of signal strength measurements with the handover target cell.
- the acknowledgement information of the feedback of the cell A refers to one of the following information: HARQ feedback of the physical layer, or STATUS Report of the RLC layer.
- step 6 The cell A starts to forward the user plane data of the UE to the handover target cell of the UE.
- the cell A determines the handover target cell of the UE according to the handover target cell information sent by the UE, and starts to forward the user plane data of the UE to the cell.
- Step 7 The UE initiates a handover process to the handover target cell.
- the UE initiates a handover procedure (ie, initiates a random access procedure) to the target cell according to the radio resource configuration included in the prepared target cell configuration.
- Step 8 The UE stops the handover process, or initiates an RRC connection re-establishment process on this basis.
- the handover notification information and the handover target cell information may be included in a measurement report (Measurement Report) specified in the current protocol, and carried by the signaling.
- the switching method is described in detail by taking the A3 event as an example. However, in addition to the A3 event, the switching method may still be triggered by other measurement events or triggered by the network.
- the user equipment UE is in the environment of cell A, cell B, cell C and cell D, respectively.
- the cell A is a serving cell of the UE, and the other three cells are a neighboring cell of the cell A and a micro cell (cell B) inside the cell A.
- the physical layer of the UE performs measurement on all the cells that can be detected, and initiates a handover process according to the measurement result.
- the specific steps are as follows: Step 1: The UE performs measurement on all cells that can be detected by the UE. When a cell meets a measurement event (for example,
- the UE When the A3 event is entered, the UE starts the TTT timer and sends handover notification information to the cell A.
- the cells that simultaneously satisfy the A3 event entry condition are: cell C and cell D.
- the content included in the handover notification information sent by the UE is any combination of the following information: identity information of cells C and D, type information of cells C and D, measurement results of cells C and D, cell The measurement result of A.
- Step 2 The cell A receives the handover notification information sent by the UE, and performs a handover preparation process according to the information.
- the cell A performs the handover preparation process according to the handover notification information as one of the following situations:
- the cell A initiates a handover preparation process with all cells included in the information according to the handover notification information, that is, initiates a handover preparation process with the cells C and D respectively;
- the cell A initiates a handover preparation process with a predetermined number of cells with the best measurement result according to the handover notification information, that is, initiates a cell with the best measurement result in the cells C and D, or the measurement result is the best.
- the handover preparation process between the several cells is performed in the third step: the cell A generates the cell configuration of the target cell to be switched, and sends it to the UE.
- the base station of the cell A generates the prepared handover target cell configuration. It includes the identifiers of the cells involved in all handover preparation procedures, that is, the identifiers of the cell C and the cell D, and the radio resource configuration required when the UE switches to the two cells.
- the base station of the cell A only includes part or all of the result of the handover preparation process in the cell configuration of the prepared handover target cell, and waits for the UE to select the handover target cell.
- Step 4 The UE receives the cell configuration that has been prepared to handover the target cell, and determines the handover target cell. In the preferred embodiment, the UE determines the handover target cell according to the measurement result of the cell, that is, the UE only uses the cell with the best measurement signal as the handover target cell, and does not consider whether the cell is in the cell configuration of the handover target cell. Contained cells.
- the UE sets the cell as the handover target cell, that is, the cell configuration that the UE determines that the handover target cell does not belong to the prepared handover target cell. If the cell with the best measurement result is one of the cell C and the cell D, the UE sets the cell as the handover target cell, that is, the handover target cell determined by the UE is the cell configuration of the handover target cell. The included cell. Step 5: The UE sends the handover target cell information to the cell A.
- the UE after the timeout of the TTT timer, the UE sends the handover target cell information to the cell A, where the handover target cell information is any combination of the identifier of the handover target cell and the signal strength measurement result of the handover target cell.
- the handover target cell information is a measurement report (Measurement Report) specified in the current protocol.
- the base station of the cell A receives the handover target cell information, and determines whether the cell is a cell included in the cell configuration of the handover target cell.
- the base station of the cell A determines, according to the received handover target cell information and the generated cell configuration of the handover target cell, whether the cell corresponding to the handover target cell information is a handover target cell.
- the cell A determines the handover target cell of the UE according to the handover target cell information sent by the UE, and starts to forward the user plane data of the UE to the cell (Cell C or Cell D).
- the acknowledgement information of the feedback of the cell A refers to one of the following information: HARQ feedback of the physical layer, or STATUS Report of the RLC layer. If the UE obtains the confirmation information that the reception is successful, step IX is performed; if the UE does not receive the acknowledgement information fed back by the cell A, or obtains the acknowledgement information of the failure of the reception, step 10 is performed.
- Step 9 The UE initiates a handover process to the handover target cell.
- the UE initiates a handover procedure (ie, initiates a random access procedure) to the target cell according to the radio resource configuration included in the prepared target cell configuration.
- Step 10 The UE stops the handover process, or initiates an RRC connection re-establishment process on this basis.
- Step 11 The base station of the cell A generates a handover command and sends it to the UE.
- the base station of the cell A since the previously performed handover preparation process does not involve the cell B, in this embodiment, the base station of the cell A first initiates a handover preparation process for the cell B, and then, according to the handover preparation process, The result is generated and a switch command is sent.
- the previous handover preparation procedure involves the case of the cell B.
- the base station of the cell A may choose not to perform the handover preparation process, SP, and use the previous handover preparation process.
- the handover preparation procedure for the cell is re-initiated.
- Step 12 The base station of the cell A starts to forward the user plane data related to the UE to the base station of the cell B.
- Step 13 The UE receives the handover command sent by the cell A, and initiates a handover procedure according to the handover command.
- the handover notification information and the handover target cell information may be included in a measurement report specified in the current protocol, and carried by the signaling.
- the method of switching is described in detail by taking the A3 event as an example, but in addition to the A3 event, the method can still be triggered by other measurement events.
- Preferred Embodiment 3 the UE is in an environment of cell A, cell B, cell C, and cell D.
- the cell A is a serving cell of the UE
- the cell B is a micro cell
- the cell B is located inside the cell A
- the cell C and the cell D are neighboring cells of the cell A.
- the UE is at the edge of cell A, between cell B and cells C, D.
- the cell A triggers the UE to perform the handover, and the specific steps are as follows: Step 1: The cell A judges that the UE needs to be handed over to another cell to accept the service, and initiates a handover preparation process. In the preferred embodiment, the cell A may determine whether it is necessary to switch the UE to another cell to receive the service by using one or a combination of the following information: (1) the mobility statistics performed by the cell A on the UE;
- the cell A may initiate a handover preparation process with all potential handover target cells, or may only be for a predetermined number of potential handover targets.
- the cell initiates a handover preparation process. That is, the cell A may initiate a handover preparation process with the cells B, C, and D, respectively, or may initiate a handover preparation process only with a part (predetermined number of) cells among the cells.
- Step 2 The cell A generates a cell configuration that is ready to handover the target cell, and sends the cell configuration to the UE.
- the cell A generates a cell configuration ready to handover the target cell based on the determination method described in "Step 1" and the completed handover preparation process.
- the cell configuration of the prepared target cell includes the prepared handover target cell whose content is a predetermined number, and the radio resource configuration information required by the user equipment to initiate the handover process to the prepared target cells.
- Step 3 The UE receives the cell configuration that has been prepared to handover the target cell, and determines the handover target cell.
- the UE determines the handover target cell by using the following method: (1) If the cell configuration of the handover target cell is only included in the cell, the UE sets the cell as the handover target cell;
- the UE preferably obtains the best measurement result, that is, the signal strongest cell is set as the handover target cell;
- the UE performs random selection in the cell that has been prepared for the cell configuration of the target cell and whose measurement result reaches a predetermined threshold, and determines the selected cell as the handover target cell, if the measurement results of all the cells are not reached. For a predetermined threshold, the UE selects the cell with the best measurement result as the handover target cell.
- the cell may be a target cell designated by the network to the UE.
- the UE may initiate a handover procedure (SP, initiate a random access procedure) immediately after determining the handover target cell, or It is possible to wait for a predetermined length of time and then initiate the handover process.
- the predetermined waiting time length is controlled by a timer, and the length of the timer may be a default value, or may be set by the UE or specified by the cell A (for example, included in the prepared target cell configuration sent by the UE;) .
- the UE does not send the handover target cell information to the cell A when the handover process is initiated.
- Step 5 The cell A caches the user plane data corresponding to the UE, and when the user plane data forwarding indication information is received, the user plane data corresponding to the UE is forwarded to the handover target cell.
- the cell A since the UE does not send the handover target cell information to the cell A, the cell A cannot determine when, or even to which cell, the user plane data of the UE is forwarded, so the cell A will cache and UE related user plane data. At the same time, only the handover process of the control plane is continued between the UE and the handover target cell.
- the cell After the control plane handover process between the UE and the handover target cell is completed, the cell sends the user plane data forwarding indication information to the cell A, and notifies the cell A to forward the buffered UE user plane data to the cell, and further The cell continues to transmit.
- the indication information may be new control plane signaling, or an indication identifier included in the existing control plane signaling (for example, UE Context Release Msg).
- the UE is in an environment of cell A, cell B, cell C, and cell D.
- the cell A is a serving cell of the UE
- the cell B is a micro cell
- the cell B is located inside the cell A
- the cell C and the cell D are neighboring cells of the cell A.
- the cell A triggers the UE to perform the handover, and the specific steps are as follows: Step 1: The cell A determines that the UE needs to be handed over to another cell to accept the service, and initiates a handover preparation process. In the preferred embodiment, the cell A may determine whether it is necessary to switch the UE to another cell to receive the service by using one or a combination of the following information: (1) Cell A's mobility statistics for the UE;
- Step 2 The cell A generates a cell configuration that is ready to handover the target cell, and sends the cell configuration to the UE.
- the cell A generates a cell configuration ready to handover the target cell based on the determination method described in "Step 1" and the completed handover preparation process.
- the prepared target cell configuration includes a predetermined number of prepared handover target cells ( ⁇ , cell C, and cell D, excluding cell B), and the radio required by the user equipment to initiate a handover process to the cell C and the cell D. Resource configuration information.
- Step 3 The UE receives the cell configuration that has been prepared to handover the target cell, and determines the handover target cell. In the preferred embodiment, the UE determines the handover target cell according to the measurement result of the cell, that is, the UE only uses the cell with the best measurement signal as the handover target cell, and does not consider whether the cell is in the cell configuration of the handover target cell. Contained cells.
- the UE sets the cell as the handover target cell, that is, the cell configuration that the UE determines that the handover target cell does not belong to the prepared handover target cell. If the cell with the best measurement result is one of the cell C and the cell D, the UE sets the cell as the handover target cell, that is, the handover target cell determined by the UE is the cell configuration of the handover target cell. The included cell. Step 4: The UE sends the handover target cell information to the cell A.
- the UE after the UE determines the handover target cell, the UE sends the handover target cell information to the cell A, where the handover target cell information is an identifier of the handover target cell and a signal strength measurement result of the handover target cell. combination.
- Step 5 The base station of the cell A receives the handover target cell information. If the base station of the cell A successfully receives the information, step 6 is performed. Otherwise, step 12 is performed.
- Step 6 The cell A determines whether the cell is a cell involved in the preparation of the handover target cell configuration.
- the base station of the cell A determines, according to the received handover target cell information and the generated cell configuration of the handover target cell, whether the cell corresponding to the handover target cell information is a handover target cell.
- the UE may initiate a handover procedure (SP, initiate a random access procedure) immediately after determining the handover target cell, or may wait for a predetermined length of time and then initiate a handover procedure.
- the predetermined waiting time length is controlled by a timer, and the length of the timer may be a default value, or may be set by the UE or specified by the cell A (for example, included in the prepared target cell configuration sent by the UE;) .
- Step 8 The cell A caches the user plane data corresponding to the UE, and when the End Marker sent by the serving gateway is received, the user plane data corresponding to the UE is forwarded to the handover target cell.
- the cell A since the cell A successfully receives the handover target cell information sent by the UE, the cell A explicitly knows the handover target cell of the UE, so the cell A will buffer the user plane data related to the UE, and After receiving the End Marker sent by the serving gateway, the user plane data corresponding to the UE is forwarded to the corresponding handover target cell.
- Step 9 The base station of the cell A generates a handover command and sends it to the UE.
- the base station of the cell A since the previous handover preparation process involves the cell B, the base station of the cell A may choose not to perform the handover preparation process, that is, use the previous handover preparation process result, or re-initiate the handover for the cell. Switch the preparation process.
- Step 10 The base station of the cell A starts to forward the user plane data related to the UE to the base station of the cell B.
- Step 11 The UE receives the handover command sent by the cell A, and initiates a handover procedure according to the handover command.
- Step 12 The UE stops the handover process, or initiates an RRC connection re-establishment process on this basis.
- the present invention achieves the following technical effects: In the case that the UE or the network side triggers the cell handover mechanism, the UE may determine the handover target according to the configuration information that the source cell can transmit the handover cell.
- the method of initiating a cell handover procedure by the UE or the network side, and solving the method for performing cell handover according to the current protocol in the related art is easy to be robust to the UE handover.
- the problem that the sex is seriously affected, and the effect of effectively ensuring the switching robustness between the macro cell and the micro cell is achieved.
- the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
- they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
- the UE can determine, according to the configuration information that the source cell can transmit the handover cell.
- the method of switching the target cell and then initiating the cell handover process by the UE or the network side solves the problem that the method for performing cell handover according to the current protocol in the related art is likely to seriously affect the robustness of the UE handover, thereby achieving the macro guarantee The effect of switching robustness between a cell and a micro cell.
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Abstract
本发明公开了一种小区切换方法及装置。其中,该方法包括:当满足预定的切换触发条件时,用户设备UE向源小区发送切换通知信息(S102);UE接收源小区发送的已准备切换目标小区的小区配置,并且确定切换目标小区,其中,已准备切换目标小区是UE能够切换的小区(S104);UE向切换目标小区发起切换过程(S106)。通过本发明,达到了能够有效保证宏小区与微小区之间的切换健壮性的效果。
Description
小区切换方法及装置 技术领域 本发明涉及通信领域, 具体而言, 涉及一种小区切换方法及装置。 背景技术 随着智能手机的普及, 人们可以在任何时间、任何地点使用智能手机连接互联网,
QQ 聊天、 刷微博、 微信等典型的数据业务已经成为了大多数人日常生活必不可少的 组成部分。 智能手机在给人们的生活带来乐趣和便利的时候, 也使数据业务量剧增, 尤其是在商业中心、 居民住宅区等人口稠密的地点, 单一的小区规划已经很难与陡增 的业务量匹配,从而严重的影响到用户体验。为了解决这些问题, 3GPP提出了 HetNet 课题, 即在现有的宏小区内增设微小区, 从而增加网络的容量, 以满足日益增长的分 组数据量。 但是, 在引入微小区的同时也引入了一系列新的问题, 其中, 宏小区与微 小区之间切换的健壮性就是代表性问题之一。 在现行的协议中, 一个完整的小区切换同时涉及到 UE的控制面过程和用户面过 程。 其中, 控制面过程主要涉及切换中的信令交互, 而用户面过程主要涉及用户数据 的转发。 以下将分别介绍控制面过程和用户面过程。 切换涉及到的控制面过程主要包含以下步骤:
( 1 ) UE的 RRC (Radio Resource Control, 无线资源控制) 层对物理层上报的邻 区信号测量结果进行层 3过滤, 并且将过滤后的值与 UE当前服务小区的信号强度测 量结果进行对比, 以判断是否能够满足 A3 事件 (测量事件之一) 的进入条件, 如果 满足了 A3事件的进入条件, 则启动 TTT (Time-To-Trigger, 触发时间) 定时器。
(2)在 TTT定时器运行期间, UE仍然会对邻区信号进行测量和比较判断。 如果 在该定时器运行期间,经层 3过滤后的物理层上报的邻区信号强度测量结果都满足 A3 事件的进入条件, 则 UE在 TTT定时器超时后向服务小区的 eNodeB (源 eNodeB)发 送 MR (Measurement Report, 测量报告) (包含服务小区和邻区的测量结果)。 (3 ) 在收到 MR后, UE当前的服务小区 (源小区) 针对 MR中包含的小区发起 切换准备过程。 在该过程中, 源小区通过 X2接口接收该小区 (即切换目标小区) 发 送的 HO CMD ( Handover Command , 切换命令) (即切换目标小区生成的 RRC
Connection Reconfiguration Msg, 其中包含了 UE向该切换目标小区切换时所需要的无 线资源配置信息)。
(4) 在切换准备过程完成之后, 源小区向 UE发送 HO CMD。
( 5 )在收到源小区发送的 HO CMD后, UE发起向切换目标小区的随机接入过程。 (6)在 UE完成向切换目标小区的接入后, 切换目标小区发起与 MME (Mobility
Management Entity,移动性管理实体)之间的 Path Switch过程,进而触发 MME与 S-GW ( Serving Gateway, 服务网关) 之间的承载修改过程。
(7) 在 "(6) " 中所述过程完成后, 切换目标小区基站会向源小区基站发送 UE Context Release Msg, 促使其释放与该 UE相关的无线资源。 切换涉及到的用户面过程主要包含以下步骤:
( 1 ) 在发送 HO CMD之后, 源小区基站开始向切换目标小区基站转发 UE的用 户面数据, 此时, 切换目标小区基站缓存接收到的用户面数据。
(2) 在随机接入过程完成之后, UE与切换目标小区之间开始进行用户面数据的 交互, 即 UE与切换目标小区直接的无线承载已经建立。 (3 ) 在 "(6)" 中描述的控制面过程完成后, 源小区基站开始于 S-GW进行用户 面数据交互, 即二者之间的承载建立完成。 另外, 在上述控制面信令和用户面数据的交互过程中, 无线接口协议栈中的 RLC (Radio Link Control, 无线链路控制) 层和物理层分别采取 ARQ (Automatic Repeat Request, 自动重传请求)机制和 HARQ (Hybrid ARQ, 混合自动重传请求)机制来保 证信令和数据的正确接收。 其中, 在 ARQ机制中, 发送端通过向接收端发送 Polling 比特, 以触发接收端向发送端反馈 STATUS Report, 从而使发送端判断接收端是否已 经正确接收数据; 而在 HARQ机制中, 接收端会向发送端反馈 Ack/Nack, 以使发送 端判断接收端是否已经正确接收数据。 以上主要描述了现行的切换过程, 以及该过程中涉及的重要机制。 从上述描述中 可以看出, 在现行的切换过程中, 从 A3 事件触发到发送切换命令之间要经历很长的 时间 (TTT + Handover Preparation Procedure) 在 HetNet场景中, 当 UE从宏小区向 微小区移动时, 因为微小区的小区半径较小, 所以, 微小区 (即切换目标小区) 的信 号强度就会快速上升。 对于仍然以宏小区 (即源小区) 为服务小区的 UE来说, 如果
按照现行协议进行长时间的等待的话, UE很可能会深入微小区, 以至于因为微小区的 干扰过大而无法正确接收或者无法接收源小区发送的 HO CMD, 从而导致切换失败, 严重的影响到 UE切换的健壮性, 从而影响到网络的性能, 而且, 上述情况在 UE运 行速度较快时表现得更为明显。 针对相关技术中根据现行协议进行小区切换的方法容易对 UE切换的健壮性产生 严重影响的问题, 目前尚未提出有效的解决方案。 发明内容 本发明实施例提供了一种小区切换方法及装置, 以至少解决上述问题。 根据本发明的一个实施例, 提供了一种小区切换方法, 应用于用户设备 UE侧, 该方法包括: 当满足预定的切换触发条件时, 用户设备 UE向源小区发送切换通知信 息; UE接收源小区发送的已准备切换目标小区的小区配置, 并确定切换目标小区, 其 中, 已准备切换目标小区是 UE能够切换的小区; UE向切换目标小区发起切换过程。 优选地, 预定的切换触发条件包括以下至少之一: 预定测量事件的进入条件; 预 定测量事件满足上报条件; 收到源小区发送的指示信息; 收到源小区的邻小区发送的 指示信息。 优选地, 切换通知信息包括以下至少之一: 满足测量事件进入条件的小区标识信 息; 满足测量事件进入条件的小区类型信息; 满足测量事件进入条件的小区的测量结 果; 源小区的测量结果。 优选地, 小区配置包括: 预定数量的已准备切换目标小区的标识, 以及 UE向已 准备切换目标小区发起切换过程所需要的无线资源配置信息。 优选地, UE使用如下方式确定切换目标小区: UE根据执行小区测量操作过程中 得到的测量结果确定切换目标小区。 优选地, UE根据测量结果确定切换目标小区包括: UE根据小区配置在已准备切 换目标小区中选择测量结果最优的小区作为切换目标小区; 或者, UE根据小区配置, 在测量结果达到预定门限值的已准备切换目标小区中随机选在一个小区作为切换目标 小区,如果已准备切换目标小区的测量结果均未达到预定门限值, UE从已准备切换目 标小区中选择信号最强的小区作为切换目标小区。
优选地, UE向切换目标小区发起切换过程, 包括: UE向源小区发送切换目标小 区信息, 并在接收到源小区反馈的用于指示接收成功的成功确认信息后, 向切换目标 小区发起切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小区发 起切换过程; 或者, UE直接向切换目标小区发起切换流程。 优选地, UE根据测量结果确定切换目标小区包括: UE将测量结果最优的小区作 为切换目标小区, 测量结果最优的小区是已准备切换目标小区中的小区或者是已准备 切换目标小区以外的小区。 优选地, UE向切换目标小区发起切换过程, 包括: 如果 UE确定的切换目标小区 属于已准备切换目标小区, 则 UE向源小区发送切换目标小区信息, 并在接收到源小 区反馈的用于指示接收成功的成功确认信息后, 向切换目标小区发起切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小区发起切换过程; 或者, UE直 接向切换目标小区发起切换流程; 如果 UE确定的切换目标小区不属已准备切换目标 小区, 则 UE向源小区发送切换目标小区信息, 并在接收源小区发送的切换命令后, 根据切换命令发起切换过程。 优选地, 切换目标小区信息包括以下至少之一: 切换目标小区的标识、 切换目标 小区的信号强度测量结果。 优选地, 成功确认信息至少包括以下信息之一: 源小区的物理层发送的混合自动 重传请求确认 HARQ-Ack指示; 源小区的无线链路控制 RLC层发送的切换目标小区 的测量结果的状态报告 STATUS Report。 优选地, 在 UE向源小区发送切换目标小区信息之后, 还包括: 在 UE未收到成 功确认信息, 或者接收到用于指示接收失败的失败确认信息, 且 UE确认源小区未成 功接收切换目标小区信息的情况下, UE执行以下操作之一: 停止切换过程; 停止切换 过程, 并发起无线资源控制连接重建过程; 直接向切换目标小区发起切换过程。 根据本发明的另一个实施例, 提供了一种小区切换装置, 位于用户设备 UE, 该装 置包括: 发送模块, 设置为当满足预定的切换触发条件时, 向源小区发送切换通知信 息; 处理模块, 设置为接收源小区发送的已准备切换目标小区的小区配置, 并确定切 换目标小区, 其中, 已准备切换目标小区是 UE能够切换的小区; 发起模块, 设置为 向切换目标小区发起切换过程。 根据本发明的又一个实施例, 提供了一种小区切换方法, 应用于用户设备 UE侧, 该方法包括: 用户设备 UE接收源小区发送的已准备切换目标小区的小区配置, 其中,
已准备切换目标小区是 UE能够切换的小区; UE确定切换目标小区; UE向切换目标 小区发起切换过程。 优选地, 小区配置包括: 预定数量的已准备切换目标小区的标识, 以及 UE向已 准备切换目标小区发起切换过程所需要的无线资源配置信息。 优选地, UE使用如下方式确定切换目标小区: UE根据执行小区测量操作过程中 得到测量结果确定切换目标小区。 优选地, UE根据测量结果确定切换目标小区包括: UE根据小区配置在已准备切 换目标小区中选择测量结果最优的小区作为切换目标小区; 或者, UE根据小区配置, 在测量结果达到预定门限值的已准备切换目标小区中随机选在一个小区作为切换目标 小区,如果已准备切换目标小区的测量结果均未达到预定门限值, UE从已准备切换目 标小区中选择信号最强的小区作为切换目标小区。 优选地, UE向切换目标小区发起切换过程, 包括: UE向源小区发送切换目标小 区信息, 并在接收到源小区反馈的用于指示接收成功的成功确认信息后, 向切换目标 小区发起切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小区发 起切换过程; 或者, UE直接向切换目标小区发起切换流程。 优选地, UE根据测量结果确定切换目标小区包括: UE将测量结果最优的小区作 为切换目标小区, 测量结果最优的小区是已准备切换目标小区中的小区或者是已准备 切换目标小区以外的小区。 优选地, UE向切换目标小区发起切换过程, 包括: 如果 UE确定的切换目标小区 属于已准备切换目标小区, 则 UE向源小区发送切换目标小区信息, 并在接收到源小 区反馈的用于指示接收成功的成功确认信息后, 向切换目标小区发起切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小区发起切换过程; 或者, UE直 接向切换目标小区发起切换流程; 如果 UE确定的切换目标小区不属于已准备切换目 标小区, 则 UE向源小区发送切换目标小区信息, 并在接收源小区发送的切换命令后, 根据切换命令发起切换过程。 优选地, 切换目标小区信息包括以下至少之一: 切换目标小区的标识、 切换目标 小区的信号强度测量结果。
优选地, 成功确认信息至少包括以下信息之一: 源小区的物理层发送的混合自动 重传请求确认 HARQ-Ack指示; 源小区的无线链路控制 RLC层发送的切换目标小区 的测量结果的状态报告 STATUS Report。 优选地, 在 UE向源小区发送切换目标小区信息之后, 还包括: 在 UE未收到成 功确认信息, 或者接收到用于指示接收失败的失败确认信息, 且 UE确认源小区未成 功接收切换目标小区信息的情况下, UE执行以下操作之一: 停止切换过程; 停止切换 过程, 并发起无线资源控制连接重建过程; 直接向切换目标小区发起切换过程。 根据本发明的又一个实施例, 提供了一种小区切换装置, 位于用户设备 UE, 该装 置包括: 接收模块, 设置为接收源小区发送的已准备切换目标小区的小区配置, 其中, 已准备切换目标小区是 UE能够切换的小区; 确定模块, 设置为确定切换目标小区; 发起模块, 设置为向切换目标小区发起切换过程。 根据本发明的又一个实施例, 提供了一种小区切换方法, 应用于网络侧, 该方法 包括: 源小区执行切换准备操作, 其中, 源小区是用户设备 UE的服务小区; 源小区根据切换准备操作的结果生成已准备切换目标小区的小区配置, 其中, 已 准备切换目标小区是 UE能够切换的小区; 源小区将小区配置发送给 UE; 源小区向切 换目标小区转发 UE的用户数据。 优选地, UE至少根据以下信息之一执行切换准备操作: UE发送的切换通知信息; 源小区获得的 UE的移动性统计信息; 源小区的负载信息; 源小区接收到的其它小区 的指示信息, 其中, 其它小区为源小区的邻小区。 优选地, 当源小区根据切换通知信息执行切换准备操作时, 采用以下方式之一: 源小区根据切换通知信息, 发起源小区与切换通知信息中包含的小区中的预定个数的 小区之间的切换准备过程; 源小区根据切换通知信息, 发起源小区与切换通知信息中 包含的小区中测量结果最好的小区之间的切换准备过程; 源小区根据切换通知信息, 发起源小区与切换通知信息中包含的小区中预定类型的小区之间的切换准备过程。 优选地, 小区配置包括: 预定数量的已准备切换目标小区的标识, 以及 UE向已 准备切换目标小区发起切换过程所需要的无线资源配置信息。 优选地, 源小区向切换目标小区转发 UE的用户数据, 包括以下方式之一: 源小 区在成功接收到 UE发送的 UE对切换目标小区进行测量得到的测量结果之后, 向切 换目标小区转发用户数据;源小区在接收到切换目标小区发送的数据转发指示信息后,
向切换目标小区转发用户数据; 源小区在接收到服务网关发送的终止标记 (End Marker) 后, 向切换目标小区转发用户数据。 根据本发明的又一个实施例, 提供了一种小区切换装置, 位于网络侧的源小区, 其中, 源小区是用户设备 UE的服务小区, 该装置包括: 执行模块, 设置为执行切换 准备操作; 生成模块, 设置为根据切换准备操作的结果生成已准备切换目标小区的小 区配置, 其中, 已准备切换目标小区是 UE能够切换的小区; 发送模块, 设置为将小 区配置发送给 UE; 转发模块, 设置为向切换目标小区转发 UE的用户数据。 根据本发明的还一个实施例, 提供了一种小区切换方法, 应用于网络侧, 该方法 包括: 源小区执行切换准备操作, 其中, 源小区是用户设备 UE的服务小区; 源小区 根据切换准备操作的结果生成已准备切换目标小区的小区配置, 其中, 已准备切换目 标小区是 UE能够切换的小区; 源小区将小区配置发送给 UE; 在源小区接收到 UE发 送的切换目标小区信息的情况下, 源小区判断切换目标小区是否属于已准备切换目标 小区, 如果判断结果为否, 向 UE发送切换命令, 其中, 切换目标小区信息包括: 切 换目标小区的标识和 /或切换目标小区的信号强度测量结果; 源小区向切换目标小区转 发 UE的用户数据。 优选地, UE至少根据以下信息之一执行切换准备操作: UE发送的切换通知信息; 源小区获得的 UE的移动性统计信息; 源小区的负载信息; 源小区接收到的其它小区 的指示信息, 其中, 其它小区为源小区的邻小区。 优选地, 当源小区根据切换通知信息执行切换准备操作时, 采用以下方式之一: 源小区根据切换通知信息, 发起源小区与切换通知信息中包含的小区中的预定个数的 小区之间的切换准备过程; 源小区根据切换通知信息, 发起源小区与切换通知信息中 包含的小区中测量结果最好的小区之间的切换准备过程; 源小区根据切换通知信息, 发起源小区与切换通知信息中包含的小区中预定类型的小区之间的切换准备过程。 优选地, 小区配置包括: 预定数量的已准备切换目标小区的标识, 以及 UE向已 准备目标小区发起切换过程所需要的无线资源配置信息。 优选地, 源小区向切换目标小区转发 UE的用户数据, 包括以下方式之一: 源小 区在成功接收到 UE发送的切换目标小区信息之后, 向切换目标小区转发用户数据; 源小区在接收到切换目标小区发送的数据转发指示信息后, 向切换目标小区转发用户 数据; 源小区在接收到服务网关发送的终止标记 (End Marker) 后, 向切换目标小区 转发用户数据。
根据本发明的还一个实施例, 提供了一种小区切换装置, 位于网络侧的源小区, 其中, 源小区是用户设备 UE的服务小区, 该装置包括: 执行模块, 设置为执行切换 准备操作; 生成模块, 设置为根据切换准备操作的结果生成已准备切换目标小区的小 区配置, 其中, 已准备切换目标小区是 UE能够切换的小区; 发送模块, 设置为将小 区配置发送给 UE;处理模块,设置为在接收到 UE发送的切换目标小区信息的情况下, 判断切换目标小区是否属于已准备切换目标小区, 如果判断结果为否, 向 UE发送切 换命令, 其中, 切换目标小区信息包括: 切换目标小区的标识和 /或切换目标小区的信 号强度测量结果; 转发模块, 设置为向切换目标小区转发 UE的用户数据。 通过本发明实施例, 采用在 UE或网络侧触发小区切换机制的情况下, UE可以根 据源小区发送的能够进行切换小区的配置信息确定出切换目标小区, 再由 UE或网络 侧发起小区切换过程的方式, 解决了相关技术中根据现行协议进行小区切换的方法容 易对 UE切换的健壮性产生严重影响的问题, 进而达到了能够有效保证宏小区与微小 区之间的切换健壮性的效果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据本发明实施例一的小区切换方法流程图; 图 2是根据本发明实施例一的小区切换装置的结构框图; 图 3是根据本发明实施例二的小区切换方法流程图; 图 4是根据本发明实施例二的小区切换装置的结构框图; 图 5是根据本发明实施例三的小区切换方法流程图; 图 6是根据本发明实施例三的小区切换装置的结构框图; 图 7是根据本发明实施例四的小区切换方法流程图; 图 8是根据本发明实施例四的小区切换装置的结构框图; 图 9是根据本发明优选实施例 1的小区切换流程图;
图 10是根据本发明优选实施例 2的小区切换流程图; 图 11是根据本发明优选实施例 3的小区切换流程图; 以及 图 12是根据本发明优选实施例 4的小区切换流程图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在不冲突的 情况下, 本申请中的实施例及实施例中的特征可以相互组合。 实施例一 本发明实施例一提供了一种小区切换方法, 可以应用于用户设备 UE侧。 图 1是 根据本发明实施例一的小区切换方法流程图, 如图 1所示, 该方法主要包括以下步骤 (步骤 S102-步骤 S106): 步骤 S102, 当满足预定的切换触发条件时, 用户设备 UE向源小区发送切换通知 信息; 步骤 S104, UE接收源小区发送的已准备切换目标小区的小区配置, 并确定切换 目标小区, 其中, 已准备切换目标小区是 UE能够切换的小区; 步骤 S106, UE向切换目标小区发起切换过程。 通过上述步骤, UE可以根据源小区发送的 UE小区配置或根据小区测量结果确定 切换目标小区, 再由 UE发起小区切换过程, 从而能够有效保证宏小区与微小区之间 的切换健壮性。 在本实施例中, 预定的切换触发条件可以包括以下至少之一: 预定测量事件的进 入条件; 预定测量事件满足上报条件; 收到源小区发送的指示信息; 收到源小区的邻 小区发送的指示信息。 在本实施例中, 切换通知信息可以包括以下至少之一: 满足测量事件进入条件的 小区标识信息; 满足测量事件进入条件的小区类型信息; 满足测量事件进入条件的小 区的测量结果; 源小区的测量结果。 在本实施例中, 小区配置可以包括: 预定数量的已准备切换目标小区的标识, 以 及 UE向已准备切换目标小区发起切换过程所需要的无线资源配置信息。
在本实施例中, UE可以使用如下方式确定切换目标小区: UE根据执行小区测量 操作过程中得到的测量结果确定切换目标小区。 在本实施例中, UE可以根据测量结果确定切换目标小区可以包括: UE根据小区 配置在已准备切换目标小区中选择测量结果最优的小区作为切换目标小区; 或者, UE 根据小区配置, 在测量结果达到预定门限值的已准备切换目标小区中随机选在一个小 区作为切换目标小区, 如果已准备切换目标小区的测量结果均未达到预定门限值, UE 从已准备切换目标小区中选择信号最强的小区作为切换目标小区。 在本实施例中, 步骤 S106可以通过这样的方式来实现: UE向源小区发送切换目 标小区信息, 并在接收到源小区反馈的用于指示接收成功的成功确认信息后, 向切换 目标小区发起切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小 区发起切换过程; 或者, UE直接向切换目标小区发起切换流程。 在本实施例中, UE根据测量结果确定切换目标小区可以采用这样的方式: UE将 测量结果最优的小区作为切换目标小区, 测量结果最优的小区是已准备切换目标小区 中的小区或者是已准备切换目标小区以外的小区。 在本实施例中, UE向切换目标小区发起切换过程, 可以这样实现: 如果 UE确定 的切换目标小区属于所属已准备切换目标小区, 则 UE向源小区发送切换目标小区信 息, 并在接收到源小区反馈的用于指示接收成功的成功确认信息后, 向切换目标小区 发起切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小区发起切 换过程; 或者, UE直接向切换目标小区发起切换流程。 如果 UE确定的切换目标小区 不属已准备切换目标小区, 则 UE向源小区发送切换目标小区信息, 并在接收源小区 发送的切换命令后, 根据切换命令发起切换过程。 优选地, 切换目标小区信息包括以下至少之一: 切换目标小区的标识、 切换目标 小区的信号强度测量结果。 优选地, 成功确认信息至少包括以下信息之一: 源小区的物理层发送的混合自动 重传请求确认 HARQ-Ack指示; 源小区的无线链路控制 RLC层发送的切换目标小区 的测量结果的状态报告 STATUS Report。 在本实施例中, 在 UE向源小区发送切换目标小区信息之后, 还可以包括: 在 UE 未收到成功确认信息, 或者接收到用于指示接收失败的失败确认信息, 且 UE确认源 小区未成功接收切换目标小区信息的情况下, UE执行以下操作之一: 停止切换过程;
停止切换过程, 并发起无线资源控制连接重建过程; 直接向切换目标小区发起切换过 程。 本发明实施例一提供了一种小区切换装置,位于用户设备 UE,该装置用于实现上 述实施例一提供的小区切换方法。 图 2是根据本发明实施例一的小区切换装置的结构 框图, 如图 2所示, 该装置可以包括: 发送模块 22、 处理模块 24以及发起模块 26。 其中, 发送模块 22, 设置为当满足预定的切换触发条件时, 向源小区发送切换通知信 息; 处理模块 24, 设置为接收源小区发送的已准备切换目标小区的小区配置, 并确定 切换目标小区, 其中, 已准备切换目标小区是 UE能够切换的小区; 发起模块 26, 设 置为向切换目标小区发起切换过程。 实施例二 本发明实施例二提供了一种小区切换方法, 可以应用于用户设备 UE侧。 图 3是 根据本发明实施例二的小区切换方法流程图, 如图 3所示, 该方法主要包括以下步骤 (步骤 S302-步骤 S306): 步骤 S302, 用户设备 UE接收源小区发送的已准备切换目标小区的小区配置, 其 中, 已准备切换目标小区是 UE能够切换的小区; 步骤 S304, UE确定切换目标小区; 步骤 S306, UE向切换目标小区发起切换过程。 在本实施例中, 小区配置可以包括: 预定数量的已准备切换目标小区的标识, 以 及 UE向已准备切换目标小区发起切换过程所需要的无线资源配置信息。 在本实施例中, UE可以使用如下方式确定切换目标小区: UE根据执行小区测量 操作过程中得到测量结果确定切换目标小区。 在本实施例中, UE根据测量结果确定切换目标小区可以通过这样的方式实现: UE根据小区配置在已准备切换目标小区中选择测量结果最优的小区作为切换目标小 区; 或者, UE根据小区配置, 在测量结果达到预定门限值的已准备切换目标小区中随 机选在一个小区作为切换目标小区, 如果已准备切换目标小区的测量结果均未达到预 定门限值, UE从已准备切换目标小区中选择信号最强的小区作为切换目标小区。 在本实施例中, 步骤 S306可以这样实现: UE向源小区发送切换目标小区信息, 并在接收到源小区反馈的用于指示接收成功的成功确认信息后, 向切换目标小区发起
切换过程; 或者, UE向源小区发送切换目标小区信息, 并向切换目标小区发起切换过 程; 或者, UE直接向切换目标小区发起切换流程。 在本实施例中, UE根据测量结果确定切换目标小区可以通过这样的方式实现: UE将测量结果最优的小区作为切换目标小区,测量结果最优的小区是已准备切换目标 小区中的小区或者是已准备切换目标小区以外的小区。 在本实施例中, 步骤 S306可以这样实现: 如果 UE确定的切换目标小区属于所属 已准备切换目标小区, 则 UE向源小区发送切换目标小区信息, 并在接收到源小区反 馈的用于指示接收成功的成功确认信息后, 向切换目标小区发起切换过程; 或者, UE 向源小区发送切换目标小区信息, 并向切换目标小区发起切换过程; 或者, UE直接向 切换目标小区发起切换流程。 如果 UE确定的切换目标小区不属于已准备切换目标小 区, 则 UE向源小区发送切换目标小区信息, 并在接收源小区发送的切换命令后, 根 据切换命令发起切换过程。 优选地, 切换目标小区信息包括以下至少之一: 切换目标小区的标识、 切换目标 小区的信号强度测量结果。 优选地, 成功确认信息至少包括以下信息之一: 源小区的物理层发送的混合自动 重传请求确认 HARQ-Ack指示; 源小区的无线链路控制 RLC层发送的切换目标小区 的测量结果的状态报告 STATUS Report。 在本实施例中, 在 UE向源小区发送切换目标小区信息之后, 还可以包括: 在 UE 未收到成功确认信息, 或者接收到用于指示接收失败的失败确认信息, 且 UE确认源 小区未成功接收切换目标小区信息的情况下, UE执行以下操作之一: 停止切换过程; 停止切换过程, 并发起无线资源控制连接重建过程; 直接向切换目标小区发起切换过 程。 本发明实施例二提供了一种小区切换装置,位于用户设备 UE,用于实现上述实施 例二提供的小区切换方法。 图 4是根据本发明实施例二的小区切换装置的结构框图, 如图 4所示, 该装置可以包括: 接收模块 42、 确定模块 44以及发起模块 46。 其中, 接收模块 42, 设置为接收源小区发送的已准备切换目标小区的小区配置, 其中, 已准 备切换目标小区是 UE能够切换的小区; 确定模块 44, 设置为确定切换目标小区; 发 起模块 46, 设置为向切换目标小区发起切换过程。 实施例三
本发明实施例三提供了一种小区切换方法, 可以应用于网络侧。 图 5是根据本发 明实施例三的小区切换方法流程图,如图 5所示,该方法主要包括以下步骤 (步骤 S502- 步骤 S506): 步骤 S502, 源小区执行切换准备操作, 其中,源小区是用户设备 UE的服务小区; 步骤 S504, 源小区根据切换准备操作的结果生成已准备切换目标小区的小区配 置, 其中, 已准备切换目标小区是 UE能够切换的小区; 步骤 S506, 源小区将小区配置发送给 UE; 步骤 S508, 源小区向切换目标小区转发 UE的用户数据。 在本实施例中, UE可以至少根据以下信息之一执行切换准备操作: UE发送的切 换通知信息; 源小区获得的 UE的移动性统计信息; 源小区的负载信息; 源小区接收 到的其它小区的指示信息, 其中, 其它小区为源小区的邻小区。 在本实施例中, 当源小区根据切换通知信息执行切换准备操作时, 可以采用以下 方式之一: 源小区根据切换通知信息, 发起源小区与切换通知信息中包含的小区中的 预定个数的小区之间的切换准备过程; 源小区根据切换通知信息, 发起源小区与切换 通知信息中包含的小区中测量结果最好的小区之间的切换准备过程; 源小区根据切换 通知信息, 发起源小区切换通知信息中包含的小区中预定类型的小区之间的切换准备 过程。 优选地, 小区配置可以包括: 预定数量的已准备切换目标小区的标识, 以及 UE 向已准备切换目标小区发起切换过程所需要的无线资源配置信息。 在本实施例中, 源小区向切换目标小区转发 UE的用户数据, 可以采用以下方式 之一: 源小区在成功接收到 UE发送的切换目标小区信息之后, 向切换目标小区转发 用户数据; 源小区在接收到切换目标小区发送的数据转发指示信息后, 向切换目标小 区转发用户数据; 源小区在接收到服务网关发送的终止标记 (End Marker) 后, 向切 换目标小区转发用户数据。 本发明实施例三提供了一种小区切换装置, 位于网络侧的源小区 (源小区是用户 设备 UE的服务小区), 设置为实现上述实施例三提供的小区切换方法。 图 6是根据本 发明实施例三的小区切换装置的结构框图, 如图 6所示, 该装置可以包括: 执行模块 62、 生成模块 64、 发送模块 66以及转发模块 68。 其中, 执行模块 62, 设置为执行切 换准备操作; 生成模块 64, 设置为根据切换准备操作的结果生成已准备切换目标小区
的小区配置, 其中, 已准备切换目标小区是 UE能够切换的小区; 发送模块 66, 设置 为将小区配置发送给 UE; 转发模块 68, 设置为向切换目标小区转发 UE的用户数据。 实施例四 本发明实施例四提供了一种小区切换方法, 可以应用于网络侧。 图 7是根据本发 明实施例四的小区切换方法流程图,如图 7所示,该方法主要包括以下步骤 (步骤 S702- 步骤 S710): 步骤 S702, 源小区执行切换准备操作, 其中,源小区是用户设备 UE的服务小区; 步骤 S704, 源小区根据切换准备操作的结果生成已准备切换目标小区的小区配 置, 其中, 已准备切换目标小区是 UE能够切换的小区; 步骤 S706, 源小区将小区配置发送给 UE; 步骤 S708, 在源小区接收到 UE发送的切换目标小区信息的情况下, 源小区判断 切换目标小区是否属于已准备切换目标小区, 如果判断结果为否, 则向 UE发送切换 命令, 其中, 切换目标小区信息包括: 切换目标小区的标识和 /或切换目标小区的信号 强度测量结果; 步骤 S710, 源小区向切换目标小区转发 UE的用户数据。 在本实施例中, UE可以至少根据以下信息之一执行切换准备操作: UE发送的切 换通知信息; 源小区获得的 UE的移动性统计信息; 源小区的负载信息; 源小区接收 到的其它小区的指示信息, 其中, 其它小区为源小区的邻小区。 在本实施例中, 当源小区根据切换通知信息执行切换准备操作时, 可以采用以下 方式之一: 源小区根据切换通知信息, 发起源小区与切换通知信息中包含的小区中的 预定个数的小区之间的切换准备过程; 源小区根据切换通知信息, 发起源小区与切换 通知信息中包含的小区中测量结果最好的小区之间的切换准备过程; 源小区根据切换 通知信息, 发起源小区与切换通知信息中包含的小区中预定类型的小区之间的切换准 备过程。 优选地, 小区配置可以包括: 预定数量的已准备切换目标小区的标识, 以及 UE 向已准备目标小区发起切换过程所需要的无线资源配置信息。 在本实施例中, 源小区向切换目标小区转发 UE的用户数据, 可以采用以下方式 之一: 源小区在成功接收到 UE发送的切换目标小区信息之后, 向切换目标小区转发
用户数据; 源小区在接收到切换目标小区发送的数据转发指示信息后, 向切换目标小 区转发用户数据; 源小区在接收到服务网关发送的终止标记 (End Marker) 后, 向切 换目标小区转发用户数据。 本发明实施例四提供了一种小区切换装置, 位于网络侧的源小区 (源小区是用户 设备 UE的服务小区), 设置为实现上述实施例四提供的小区切换方法。 图 8是根据本 发明实施例四的小区切换装置的结构框图, 如图 8所示, 该装置可以包括: 执行模块 80, 设置为执行切换准备操作; 生成模块 82, 设置为根据切换准备操作的结果生成已 准备切换目标小区的小区配置, 其中, 已准备切换目标小区是 UE能够切换的小区; 发送模块 84, 设置为将小区配置发送给 UE; 处理模块 86, 设置为在接收到 UE发送 的切换目标小区信息的情况下, 判断切换目标小区是否属于已准备切换目标小区, 如 果判断结果为否, 向 UE发送切换命令, 其中, 切换目标小区信息包括: 切换目标小 区的标识和 /或切换目标小区的信号强度测量结果;转发模块 88,设置为向切换目标小 区转发 UE的用户数据。 采用上述实施例提供的小区切换方法及装置, 在 UE或网络侧触发小区切换机制 的情况下, UE可以根据源小区发送的能够进行切换小区的配置信息确定出切换目标小 区, 再由 UE或网络侧发起小区切换过程, 达到了能够有效保证宏小区与微小区之间 的切换健壮性的效果。 以下结合图 9至图 12以及优选实施 1至优选实施例 4对上述实施例一至实施例四 提供的小区切换方法及装置进行更加详细的说明。 优选实施例 1 在本优选实施例中, 用户设备 UE所处的环境中分别有小区 A、 小区 B、 小区 C、 小区 D和小区 E。 其中, 小区 A为 UE的服务小区, 其余四个小区分别为小区 A的邻 区和小区 A内部的微小区 (小区 B)。在本实施例中, UE的物理层对其能够检测到的所 有小区进行测量, 并且根据测量的结果发起切换过程, 具体步骤如下所示: 步骤一: UE对其能够检测到的所有小区进行测量, 当有小区满足测量事件 (例如,
A3事件)的进入条件时, UE启动 TTT定时器, 并且向小区 A发送切换通知信息。 在本优选实施例中, 同时满足 A3事件进入条件的小区为: 小区 B、 小区 C和小 区 D。
在本优选实施例中, UE发送的切换通知信息中所包含的信息为以下信息的任意组 合: 小区 B、 C和 D的标识信息, 小区 B、 C和 D的类型信息, 小区 B、 C和 D的测 量结果, 小区 A的测量结果。 步骤二: 小区 A接收 UE发送的切换通知信息, 并且依据该信息执行切换准备过 程。 在本实施例中, 小区 A依据切换通知信息执行切换准备过程为以下情形之一:
( 1 ) 小区 A根据切换通知信息, 发起与该信息中包含的所有小区之间的切换准 备过程, 即分别发起与小区 B、 C和 D之间的切换准备过程;
(2) 小区 A根据切换通知信息, 发起与预定数量的、 测量结果最好的小区之间 的切换准备过程, 即发起与小区 B、 C和 D中测量结果最好的小区, 或者测量结果最 好的若干小区之间的切换准备过程;
(3 ) 小区 A根据切换通知信息, 发起与预定类型的小区之间的切换准备过程, 即发起与小区 B之间的切换准备过程,或者发起与小区 C和小区 D之间的切换准备过 程。 步骤三: 小区 A生成已准备切换目标小区的小区配置, 并且将其发送给 UE。 在本优选实施例中, 小区 A的基站生成的已准备切换目标小区的小区配置中包含 了预定数量的、 切换准备过程涉及到的小区的标识, 以及 UE向这些小区切换时所需 的无线资源配置。 其中, 所述预订数量可以仅仅是一个小区, 或者部分小区, 或者全 部的小区。 在该步骤中, 小区 A的基站仅仅是将切换准备过程的部分或者全部结果包含在已 准备切换目标小区的小区配置中, 待 UE来确定切换目标小区。 步骤四: UE接收已准备切换目标小区的小区配置, 并且确定切换目标小区。 在本优选实施例中, UE根据小区的测量结果确定切换目标小区,确定切换目标小 区的方法可以为以下方法之一: ( 1 )如果已准备目标小区的小区配置中仅仅包含一个小区的信息, 则 UE将该小 区设置为切换目标小区;
(2)如果已准备目标小区的小区配置中包含了多个小区的信息, 则 UE将这些小 区中测量结果最好的小区设置为切换目标小区, 即 UE将小区 B、 C和 D中的最强小 区设置为切换目标小区;
(3 ) UE在已准备目标小区的小区配置包含的、 测量结果达到预定门限值的小区 中进行随机选择, 并将所选的小区确定为切换目标小区, 如果所有小区的测量结果都 没有达到预定的门限值, 则 UE选择测量结果最好的小区作为切换目标小区。 其中, 对于已准备切换目标小区的小区配置中仅仅包含一个小区的情形, 该小区 可以为网络向 UE指定的切换目标小区。 在本优选实施例中, UE可以在以下两个时间点之一确定切换目标小区: ( 1 ) 在收到潜在切换目标小区配置后, UE即刻确定切换目标小区;
(2) 在收到潜在切换目标小区配置, 并且 TTT超时后, UE确定切换目标小区。 步骤五: UE向小区 A发送切换目标小区信息, 并且等待小区 A的反馈确认信息。 在本优选实施例中, 在 TTT定时器超时后, 并且在 UE已经确定切换目标小区的 情况下, UE向小区 A发送切换目标小区信息, 其中, 所述切换目标小区信息为切换 目标小区的标识与切换目标小区的信号强度测量结果的任意组合。 在本优选实施例中,小区 A的反馈的确认信息是指以下信息之一:物理层的 HARQ 反馈, 或者 RLC层的 STATUS Report。其中, 如果 UE得到的是接收成功的确认信息, 则执行步骤六; 如果 UE没有收到小区 A反馈的确认信息, 或者得到的是接收失败的 确认信息, 则执行步骤七。 步骤六: 小区 A开始向 UE的切换目标小区转发 UE的用户面数据。 在本优选实施例中, 小区 A根据收到的 UE发送的切换目标小区信息, 确定 UE 的切换目标小区, 并且开始向该小区转发 UE的用户面数据。 步骤七: UE向切换目标小区发起切换过程。 在本优选实施例中, UE依据已准备目标小区配置中包含的无线资源配置, 向目标 小区发起切换过程 (即, 发起随机接入过程)。 步骤八: UE停止切换过程, 或者, 在此基础上发起 RRC连接重建过程。
在本优选实施例中, 所述切换通知信息和所述切换目标小区信息可以包含在现行 协议中规定的测量报告 (Measurement Report), 由该信令携带。 另外, 本实施例以 A3事件为例详细描述了该切换方法, 但是, 除 A3事件以外, 该切换方法仍然可以采用其它的测量事件进行触发, 或者由网络触发。 优选实施例 2 在本优选实施例中, 用户设备 UE所处的环境中分别有小区 A、 小区 B、 小区 C 和小区 D。 其中, 小区 A为 UE的服务小区, 其余三个小区分别为小区 A的邻区和小 区 A内部的微小区 (小区 B)。在本实施例中, UE的物理层对其能够检测到的所有小区 进行测量, 并且根据测量的结果发起切换过程, 具体步骤如下所示: 步骤一: UE对其能够检测到的所有小区进行测量, 当有小区满足测量事件 (例如,
A3事件)的进入条件时, UE启动 TTT定时器, 并且向小区 A发送切换通知信息。 在本优选实施例中, 同时满足 A3事件进入条件的小区为: 小区 C和小区 D。 在本优选实施例中, UE发送的切换通知信息中所包含的内容为以下信息的任意组 合: 小区 C和 D的标识信息, 小区 C和 D的类型信息, 小区 C和 D的测量结果, 小 区 A的测量结果。 步骤二: 小区 A接收 UE发送的切换通知信息, 并且依据该信息执行切换准备过 程。 在本优选实施例中,小区 A根据切换通知信息执行切换准备过程为以下情形之一:
( 1 ) 小区 A根据切换通知信息, 发起与该信息中包含的所有小区之间的切换准 备过程, 即分别发起与小区 C和 D之间的切换准备过程;
(2) 小区 A根据切换通知信息, 发起与预定数量的、 测量结果最好的小区之间 的切换准备过程, 即发起与小区 C和 D中测量结果最好的小区, 或者测量结果最好的 若干小区之间的切换准备过程 步骤三: 小区 A生成已准备切换目标小区的小区配置, 并且将其发送给 UE; 在本优选实施例中, 小区 A的基站生成的已准备切换目标小区配置中包含了所有 切换准备过程涉及到的小区的标识, 即小区 C和小区 D的标识, 以及 UE向这两个小 区切换时所需的无线资源配置。
在该步骤中, 小区 A的基站仅仅是将切换准备过程的部分或者全部结果包含在已 准备切换目标小区的小区配置中, 待 UE来选择切换目标小区。 步骤四: UE接收已准备切换目标小区的小区配置, 并且确定切换目标小区。 在本优选实施例中, UE依据小区的测量结果确定切换目标小区, 即 UE仅仅将 测量信号最好的小区作为切换目标小区, 并不会考虑该小区是否为已准备切换目标小 区的小区配置中包含的小区。 在本优选实施例中, 如果此时测量结果最好的小区是小区 B, 则 UE将该小区设 置为切换目标小区, 即 UE确定的切换目标小区不属于已准备切换目标小区的小区配 置所包含的小区; 如果此时测量结果最好的小区是小区 C和小区 D中的一者, 则 UE 将该小区设置为切换目标小区, 即 UE确定的切换目标小区是已准备切换目标小区的 小区配置所包含的小区。 步骤五: UE向小区 A发送切换目标小区信息。 在本优选实施例中,在 TTT定时器超时后, UE向小区 A发送切换目标小区信息, 其中, 所述切换目标小区信息为切换目标小区的标识与切换目标小区的信号强度测量 结果的任意组合。 实际上, 该切换目标小区信息为现行协议中规定的测量报告 (Measurement Report)。 步骤六: 小区 A的基站接收切换目标小区信息, 并且判断该小区是否为已准备切 换目标小区的小区配置包含的小区。 在本优选实施例中, 小区 A的基站根据接收到的切换目标小区信息和其所生成的 已准备切换目标小区的小区配置, 判断切换目标小区信息所对应的小区是否为已准备 切换目标小区的小区配置中包含的小区。 如果判断结果是肯定的 (即, 切换目标小区为 小区 C和 D中的一者), 则在执行步骤七, 否则, 如果判断结果是否定的 (即, 切换目 标小区为小区 B), 则执行步骤十一。 步骤七: 小区 A向 UE的切换目标小区转发 UE的用户面数据。 在本优选实施例中, 小区 A根据收到的 UE发送的切换目标小区信息, 确定 UE 的切换目标小区, 并且开始向该小区 (小区 C或者小区 D)转发 UE的用户面数据。 步骤八: UE接收小区 A的反馈确认信息。
在本优选实施例中,小区 A的反馈的确认信息是指以下信息之一:物理层的 HARQ 反馈, 或者 RLC层的 STATUS Report。其中, 如果 UE得到的是接收成功的确认信息, 则执行步骤九; 如果 UE没有收到小区 A反馈的确认信息, 或者得到的是接收失败的 确认信息, 则执行步骤十。 步骤九: UE向切换目标小区发起切换过程。 在本优选实施例中, UE依据已准备目标小区配置中包含的无线资源配置, 向目标 小区发起切换过程 (即, 发起随机接入过程)。 步骤十: UE停止切换过程, 或者, 在此基础上发起 RRC连接重建过程。 步骤十一: 小区 A的基站生成切换命令, 并且发送给 UE。 在本优选实施例中, 由于之前进行的切换准备过程并没有涉及到小区 B, 所以, 在本实施例中, 小区 A的基站先发起针对小区 B的切换准备过程, 而后, 根据切换准 备过程的结果生成并且发送切换命令。 对于本优选实施例中没有描述的情形, 即, 之前的切换准备过程涉及到小区 B的 情形, 对于这种情形, 小区 A的基站可以选择不执行切换准备过程, SP, 使用之前的 切换准备过程结果, 或者, 重新发起针对该小区的切换准备过程。 步骤十二: 小区 A的基站开始向小区 B的基站转发该 UE涉及到的用户面数据。 步骤十三: UE接收小区 A发送的切换命令, 并且根据切换命令发起切换过程。 在本优选实施例中, 切换通知信息和所述切换目标小区信息可以包含在现行协议 中规定的测量报告 (Measurement Report), 由该信令携带。 另外, 本实施例以 A3事件 为例详细描述了切换的方法, 但是, 除 A3 事件以外, 该方法仍然可以采用其它的测 量事件进行触发。 优选实施例 3 在本优选实施例中, UE所处的环境中有小区 A、 小区 B、 小区 C和小区 D。 其 中, 小区 A为 UE的服务小区, 小区 B为微小区, 并且小区 B位于小区 A内部, 小 区 C和小区 D为小区 A的邻区。 UE处于小区 A的边缘,在小区 B与小区 C、 D之间。 在本实施例中, 小区 A触发 UE进行切换, 具体步骤如下所示:
步骤一: 小区 A判断需要将 UE切换至其它小区接受服务, 并且发起切换准备过 程。 在本优选实施例中, 小区 A可以通过如下信息之一或者组合判断是否需要将 UE 切换至其它小区接收服务: ( 1 ) 小区 A对该 UE进行的移动性统计;
(2) 小区 A当前的负载信息;
(3 ) 小区 A接收到的其它小区所发送的指示信息。 在本优选实施例中, 在判断确实需要将 UE切换至其它小区继续接受服务时, 小 区 A可以分别发起与所有潜在切换目标小区之间的切换准备过程, 也可以仅仅针对预 定数量的潜在切换目标小区发起切换准备过程。 即小区 A可以分别发起与小区 B、 C 和 D之间的切换准备过程, 也可以只发起与这些小区中的部分 (预定数量)小区之间的 切换准备过程。 步骤二: 小区 A生成已准备切换目标小区的小区配置, 并且发送给 UE。 在本优选实施例中, 小区 A在 "步骤一"所述的判断方法和已完成的切换准备过 程的基础上, 生成已准备切换目标小区的小区配置。 其中, 已准备目标小区的小区配 置中包含内容为预定数量的已准备切换目标小区, 以及用户设备向这些已准备目标小 区发起切换过程所需的无线资源配置信息。 步骤三: UE接收已准备切换目标小区的小区配置, 并且确定切换目标小区。 在本优选实施例中, UE采用如下方法确定切换目标小区: ( 1 )若已准备切换目标小区的小区配置中仅仅包含一个小区, 则 UE将该小区设 置为切换目标小区;
(2) 若已准备切换目标小区的小区配置包含多个小区, 则 UE将测量结果最好, 即信号最强小区设置为切换目标小区;
(3 ) UE在已准备目标小区的小区配置包含的、 测量结果达到预定门限值的小区 中进行随机选择, 并将所选的小区确定为切换目标小区, 如果所有小区的测量结果都 没有达到预定的门限值, 则 UE选择测量结果最好的小区作为切换目标小区。
其中, 对于已准备切换目标小区的小区配置中仅仅包含一个小区的情形, 该小区 可以为网络向 UE指定的目标小区。 步骤四: UE根据所确定的切换目标小区配置向目标小区发起切换过程; 在本优选实施例中, UE可以在确定切换目标小区之后即刻发起切换过程 (SP, 发 起随机接入过程), 或者, 可以等待预定的时间长度, 而后在发起切换过程。 其中, 预 定的等待时间长度由定时器控制, 该定时器的长度可以是默认值, 或者由 UE 自行设 定, 或者由小区 A指定 (例如, 包含在其发送的已准备目标小区配置中;)。 在本优选实施例中, UE在发起切换过程时, 不会向小区 A发送切换目标小区信 息。 步骤五: 小区 A缓存 UE对应的用户面数据,待收到用户面数据转发指示信息时, 将该 UE对应的用户面数据转发给切换目标小区。 在本优选实施例中, 由于 UE并未向小区 A发送切换目标小区信息, 所以, 小区 A无法判断何时, 甚至是向哪个小区转发 UE的用户面数据, 所以, 小区 A将会缓存 与该 UE相关的用户面数据。与此同时, UE和切换目标小区之间也只会继续执行控制 面的切换过程。 待 UE与切换目标小区之间的控制面切换过程完成之后, 该小区将向小区 A发送 所述用户面数据转发指示信息,通知小区 A将其缓存的 UE用户面数据转发至该小区, 进而由该小区继续发送。 其中, 所述指示信息可以是新的控制面信令, 或者现有控制 面信令 (;例如: UE Context Release Msg)中包含的指示标识。 优选实施例 4 在本优选实施例中, UE所处的环境中有小区 A、 小区 B、 小区 C和小区 D。 其 中, 小区 A为 UE的服务小区, 小区 B为微小区, 并且小区 B位于小区 A内部, 小 区 C和小区 D为小区 A的邻区。 在本实施例中, 小区 A触发 UE进行切换, 具体步 骤如下所示: 步骤一: 小区 A判断需要将 UE切换至其它小区接受服务, 并且发起切换准备过 程。 在本优选实施例中, 小区 A可以通过如下信息之一或者组合判断是否需要将 UE 切换至其它小区接收服务:
( 1 ) 小区 A对该 UE进行的移动性统计;
(2) 小区 A当前的负载信息;
(3 ) 小区 A接收到的其它小区所发送的指示信息。 在本优选实施例中, 在判断确实需要将 UE切换至其它小区继续接受服务时, 小 区 A分别发起与所有潜在切换目标小区之间的切换准备过程, δΡ, 小区 A分别发起与 小区 B、 C和 D之间的切换准备过程。 步骤二: 小区 A生成已准备切换目标小区的小区配置, 并且发送给 UE。 在本优选实施例中, 小区 A在 "步骤一"所述的判断方法和已完成的切换准备过 程的基础上, 生成已准备切换目标小区的小区配置。 其中, 已准备目标小区配置中包 含内容为预定数量的已准备切换目标小区(δΡ, 小区 C和小区 D, 不包括小区 B), 以 及用户设备向小区 C和小区 D发起切换过程所需的无线资源配置信息。 步骤三: UE接收已准备切换目标小区的小区配置, 并且确定切换目标小区。 在本优选实施例中, UE依据小区的测量结果确定切换目标小区, 即 UE仅仅将 测量信号最好的小区作为切换目标小区, 并不会考虑该小区是否为已准备切换目标小 区的小区配置中包含的小区。 在本优选实施例中, 如果此时测量结果最好的小区是小区 B, 则 UE将该小区设 置为切换目标小区, 即 UE确定的切换目标小区不属于已准备切换目标小区的小区配 置所包含的小区; 如果此时测量结果最好的小区是小区 C和小区 D中的一者, 则 UE 将该小区设置为切换目标小区, 即 UE确定的切换目标小区是已准备切换目标小区的 小区配置所包含的小区。 步骤四: UE向小区 A发送切换目标小区信息。 在本优选实施例中, 在 UE确定切换目标小区后, UE向小区 A发送切换目标小 区信息, 其中, 所述切换目标小区信息为切换目标小区的标识与切换目标小区的信号 强度测量结果的任意组合。 步骤五: 小区 A的基站接收切换目标小区信息, 若小区 A的基站成功接收到所述 信息, 则执行步骤六, 否则, 执行步骤十二。 步骤六: 小区 A判断该小区是否为已准备切换目标小区配置涉及到的小区。
在本优选实施例中, 小区 A的基站根据接收到的切换目标小区信息和其所生成的 已准备切换目标小区的小区配置, 判断切换目标小区信息所对应的小区是否为已准备 切换目标小区的小区配置中包含的小区。 如果判断结果是肯定的 (即, 切换目标小区为 小区 C和 D中的一者), 则在执行步骤七, 否则, 如果判断结果是否定的 (即, 切换目 标小区为小区 B), 则执行步骤九。 步骤七: UE根据切换目标小区配置向目标小区发起切换过程。 在本优选实施例中, UE可以在确定切换目标小区之后即刻发起切换过程 (SP, 发 起随机接入过程), 或者, 可以等待预定的时间长度, 而后在发起切换过程。 其中, 预 定的等待时间长度由定时器控制, 该定时器的长度可以是默认值, 或者由 UE 自行设 定, 或者由小区 A指定 (例如, 包含在其发送的已准备目标小区配置中;)。 步骤八: 小区 A缓存 UE对应的用户面数据, 待收到服务网关发送的 End Marker 时, 将该 UE对应的用户面数据转发给切换目标小区。 在本优选实施例中, 由于小区 A成功接收到了 UE发送的切换目标小区信息, 所 以, 小区 A明确知道 UE的切换目标小区, 所以, 小区 A将会缓存与该 UE相关的用 户面数据, 并且在收到服务网关发送的 End Marker后, 将该 UE对应的用户面数据转 发至其所对应的切换目标小区。 步骤九: 小区 A的基站生成切换命令, 并且发送给 UE。 在本优选实施例中, 由于之前的切换准备过程涉及到小区 B, 所以, 小区 A的基 站可以选择不执行切换准备过程, 即, 使用之前的切换准备过程结果, 或者, 重新发 起针对该小区的切换准备过程。 步骤十: 小区 A的基站开始向小区 B的基站转发该 UE涉及到的用户面数据。 步骤十一: UE接收小区 A发送的切换命令, 并且根据切换命令发起切换过程。 步骤十二: UE停止切换过程, 或者, 在此基础上发起 RRC连接重建过程。 从以上的描述中, 可以看出, 本发明实现了如下技术效果: 采用在 UE或网络侧触发小区切换机制的情况下, UE可以根据源小区发送的能够 进行切换小区的配置信息确定出切换目标小区, 再由 UE或网络侧发起小区切换过程 的方式, 解决了相关技术中根据现行协议进行小区切换的方法容易对 UE切换的健壮
性产生严重影响的问题, 进而达到了能够有效保证宏小区与微小区之间的切换健壮性 的效果。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。 工业实用性 本发明提供的上述技术方案, 可以应用于小区的切换过程中, 采用在 UE或网络 侧触发小区切换机制的情况下, UE可以根据源小区发送的能够进行切换小区的配置信 息确定出切换目标小区, 再由 UE或网络侧发起小区切换过程的方式, 解决了相关技 术中根据现行协议进行小区切换的方法容易对 UE切换的健壮性产生严重影响的问题, 进而达到了能够有效保证宏小区与微小区之间的切换健壮性的效果。
Claims
1. 一种小区切换方法, 应用于用户设备 UE侧, 包括:
当满足预定的切换触发条件时,用户设备 UE向源小区发送切换通知信息; 所述 UE接收所述源小区发送的已准备切换目标小区的小区配置, 并且确 定切换目标小区, 其中, 所述已准备切换目标小区是所述 UE能够切换的小区; 所述 UE向所述切换目标小区发起切换过程。
2. 根据权利要求 1所述的方法, 其中, 所述预定的切换触发条件包括以下至少之 预定测量事件的进入条件;
预定测量事件满足上报条件;
收到所述源小区发送的指示信息;
收到所述源小区的邻小区发送的指示信息。
3. 根据权利要求 1所述的方法, 其中, 所述切换通知信息包括以下至少之一: 满足测量事件进入条件的小区标识信息;
满足测量事件进入条件的小区类型信息;
满足测量事件进入条件的小区的测量结果;
所述源小区的测量结果。
4. 根据权利要求 1所述的方法, 其中, 所述小区配置包括:
预定数量的所述已准备切换目标小区的标识, 以及所述 UE向所述已准备 切换目标小区发起切换过程所需要的无线资源配置信息。
5. 根据权利要求 1所述的方法, 其中, 所述 UE使用如下方式确定所述切换目标 小区:
所述 UE根据执行小区测量操作过程中得到的测量结果确定所述切换目标 小区。
6. 根据权利要求 5所述的方法, 其中, 所述 UE根据所述测量结果确定所述切换 目标小区包括:
所述 UE根据所述小区配置在所述已准备切换目标小区中选择测量结果最 优的小区作为所述切换目标小区; 或者,
所述 UE根据所述小区配置, 在测量结果达到预定门限值的所述已准备切 换目标小区中随机选在一个小区作为所述切换目标小区, 如果所述已准备切换 目标小区的测量结果均未达到所述预定门限值, 所述 UE从所述已准备切换目 标小区中选择信号最强的小区作为所述切换目标小区。
7. 根据权利要求 6所述的方法, 其中, 所述 UE向所述切换目标小区发起切换过 程, 包括:
所述 UE向所述源小区发送切换目标小区信息, 并在接收到所述源小区反 馈的用于指示接收成功的成功确认信息后,向所述切换目标小区发起切换过程; 或者,
所述 UE向所述源小区发送切换目标小区信息, 并向所述切换目标小区发 起切换过程; 或者,
所述 UE直接向所述切换目标小区发起切换流程。
8. 根据权利要求 5所述的方法, 其中, 所述 UE根据所述测量结果确定所述切换 目标小区包括:
所述 UE将测量结果最优的小区作为所述切换目标小区, 所述测量结果最 优的小区是所述已准备切换目标小区中的小区或者是所述已准备切换目标小区 以外的小区。
9. 根据权利要求 8所述的方法, 其中, 所述 UE向所述切换目标小区发起切换过 程, 包括:
如果所述 UE确定的切换目标小区属于所述已准备切换目标小区, 则所述 UE 向所述源小区发送切换目标小区信息, 并在接收到所述源小区反馈的用于 指示接收成功的成功确认信息后, 向所述切换目标小区发起切换过程; 或者, 所述 UE向所述源小区发送切换目标小区信息, 并向所述切换目标小区发起切 换过程; 或者, 所述 UE直接向所述切换目标小区发起切换流程;
如果所述 UE确定的切换目标小区不属于所述已准备切换目标小区, 则所 述 UE向所述源小区发送切换目标小区信息, 并在接收所述源小区发送的切换 命令后, 根据所述切换命令发起所述切换过程。
10. 根据权利要求 7或 9所述的方法, 其中, 所述切换目标小区信息包括以下至少 之一:
所述切换目标小区的标识、 所述切换目标小区的信号强度测量结果。
11. 根据权利要求 7所述的方法,其中,所述成功确认信息至少包括以下信息之一:
所述源小区的物理层发送的混合自动重传请求确认 HARQ-Ack指示; 所述源小区的无线链路控制 RLC 层发送的所述切换目标小区的测量结果 的状态报告 STATUS Report
12. 根据权利要求 7所述的方法, 其中, 在所述 UE向所述源小区发送切换目标小 区信息之后, 还包括:
在所述 UE未收到所述成功确认信息, 或者接收到用于指示接收失败的失 败确认信息, 且所述 UE确认所述源小区未成功接收所述切换目标小区信息的 情况下, 所述 UE执行以下操作之一:
停止切换过程;
停止切换过程, 并发起无线资源控制连接重建过程;
直接向所述切换目标小区发起切换过程。
13. 一种小区切换装置, 位于用户设备 UE, 包括:
发送模块, 设置为当满足预定的切换触发条件时, 向源小区发送切换通知 信息;
处理模块,设置为接收所述源小区发送的已准备切换目标小区的小区配置, 并且确定切换目标小区, 其中, 所述已准备切换目标小区是所述 UE能够切换 的小区;
发起模块, 设置为向所述切换目标小区发起切换过程。
14. 一种小区切换方法, 应用于用户设备 UE侧, 包括:
用户设备 UE接收源小区发送的已准备切换目标小区的小区配置, 其中, 所述已准备切换目标小区是所述 UE能够切换的小区;
所述 UE确定切换目标小区;
所述 UE向所述切换目标小区发起切换过程。
15. 根据权利要求 14所述的方法, 其中, 所述小区配置包括:
预定数量的所述已准备切换目标小区的标识, 以及所述 UE向所述已准备 切换目标小区发起切换过程所需要的无线资源配置信息。
16. 根据权利要求 14所述的方法, 其中, 所述 UE使用如下方式确定所述切换目标 小区:
所述 UE根据执行小区测量操作过程中得到测量结果确定所述切换目标小 区。
17. 根据权利要求 16所述的方法, 其中, 所述 UE根据所述测量结果确定所述切换 目标小区包括:
所述 UE根据所述小区配置在所述已准备切换目标小区中选择测量结果最 优的小区作为所述切换目标小区; 或者,
所述 UE根据所述小区配置, 在测量结果达到预定门限值的所述已准备切 换目标小区中随机选在一个小区作为所述切换目标小区, 如果所述已准备切换 目标小区的测量结果均未达到所述预定门限值, 所述 UE从所述已准备切换目 标小区中选择信号最强的小区作为所述切换目标小区。
18. 根据权利要求 17所述的方法, 其中, 所述 UE向所述切换目标小区发起切换过 程, 包括:
所述 UE向所述源小区发送切换目标小区信息, 并在接收到所述源小区反 馈的用于指示接收成功的成功确认信息后,向所述切换目标小区发起切换过程; 或者,
所述 UE向所述源小区发送切换目标小区信息, 并向所述切换目标小区发 起切换过程; 或者,
所述 UE直接向所述切换目标小区发起切换流程。
19. 根据权利要求 16所述的方法, 其中, 所述 UE根据所述测量结果确定所述切换 目标小区包括:
所述 UE将测量结果最优的小区作为所述切换目标小区, 所述测量结果最 优的小区是所述已准备切换目标小区中的小区或者是所述已准备切换目标小区 以外的小区。
20. 根据权利要求 19所述的方法, 其中, 所述 UE向所述切换目标小区发起切换过 程, 包括:
如果所述 UE确定的切换目标小区属于所述已准备切换目标小区, 则所述 UE 向所述源小区发送切换目标小区信息, 并在接收到所述源小区反馈的用于 指示接收成功的成功确认信息后, 向所述切换目标小区发起切换过程; 或者, 所述 UE向所述源小区发送切换目标小区信息, 并向所述切换目标小区发起切 换过程; 或者, 所述 UE直接向所述切换目标小区发起切换流程;
如果所述 UE确定的切换目标小区不属于所述已准备切换目标小区, 则所 述 UE向所述源小区发送切换目标小区信息, 并在接收所述源小区发送的切换 命令后, 根据所述切换命令发起所述切换过程。
21. 根据权利要求 18或 20所述的方法, 其中, 所述切换目标小区信息包括以下至 少之一:
所述切换目标小区的标识、 所述切换目标小区的信号强度测量结果。
22. 根据权利要求 18所述的方法,其中,所述成功确认信息至少包括以下信息之一:
所述源小区的物理层发送的混合自动重传请求确认 HARQ-Ack指示; 所述源小区的无线链路控制 RLC 层发送的所述切换目标小区的测量结果 的状态报告 STATUS Report
23. 根据权利要求 18所述的方法, 其中, 在所述 UE向所述源小区发送切换目标小 区信息之后, 还包括:
在所述 UE未收到所述成功确认信息, 或者接收到用于指示接收失败的失 败确认信息, 且所述 UE确认所述源小区未成功接收所述切换目标小区信息的 情况下, 所述 UE执行以下操作之一:
停止切换过程;
停止切换过程, 并发起无线资源控制连接重建过程;
直接向所述切换目标小区发起切换过程。
24. 一种小区切换装置, 位于用户设备 UE, 包括:
接收模块, 设置为接收源小区发送的已准备切换目标小区的小区配置, 其 中, 所述已准备切换目标小区是所述 UE能够切换的小区;
确定模块, 设置为确定切换目标小区;
发起模块, 设置为向所述切换目标小区发起切换过程。
25. 一种小区切换方法, 应用于网络侧, 包括:
源小区执行切换准备操作, 其中, 所述源小区是用户设备 UE的服务小区; 所述源小区根据所述切换准备操作的结果生成已准备切换目标小区的小区 配置, 其中, 所述已准备切换目标小区是所述 UE能够切换的小区;
所述源小区将所述小区配置发送给所述 UE;
所述源小区向所述切换目标小区转发所述 UE的用户数据。
26. 根据权利要求 25所述的方法, 其中, 所述 UE至少根据以下信息之一执行所述 切换准备操作:
所述 UE发送的切换通知信息;
所述源小区获得的所述 UE的移动性统计信息;
所述源小区的负载信息;
所述源小区接收到的其它小区的指示信息, 其中, 所述其它小区为所述源 小区的邻小区。
27. 根据权利要求 26所述的方法,其中, 当所述源小区根据所述切换通知信息执行 所述切换准备操作时, 采用以下方式之一:
所述源小区根据所述切换通知信息, 发起所述源小区与所述切换通知信息 中包含的小区中的预定个数的小区之间的切换准备过程;
所述源小区根据所述切换通知信息, 发起所述源小区与所述切换通知信息 中包含的小区中测量结果最好的小区之间的切换准备过程;
所述源小区根据所述切换通知信息, 发起所述源小区与所述切换通知信息 中包含的小区中预定类型的小区之间的切换准备过程。
28. 根据权利要求 25所述的方法, 其中, 所述小区配置包括:
预定数量的所述已准备切换目标小区的标识, 以及所述 UE向所述已准备 切换目标小区发起切换过程所需要的无线资源配置信息。
29. 根据权利要求 25所述的方法,其中,所述源小区向所述切换目标小区转发所述 UE的用户数据, 包括以下方式之一:
所述源小区在成功接收到所述 UE发送的所述切换目标小区信息之后, 向 所述切换目标小区转发所述用户数据;
所述源小区在接收到所述切换目标小区发送的数据转发指示信息后, 向所 述切换目标小区转发所述用户数据;
所述源小区在接收到服务网关发送的终止标记 End Marker后, 向所述切换 目标小区转发所述用户数据。
30. 一种小区切换装置, 位于网络侧的源小区, 其中, 所述源小区是用户设备 UE 的服务小区, 所述装置包括:
执行模块, 设置为执行切换准备操作;
生成模块, 设置为根据所述切换准备操作的结果生成已准备切换目标小区 的小区配置, 其中, 所述已准备切换目标小区是所述 UE能够切换的小区; 发送模块, 设置为将所述小区配置发送给所述 UE;
转发模块, 设置为向所述切换目标小区转发所述 UE的用户数据。
31. 一种小区切换方法, 应用于网络侧, 包括:
源小区执行切换准备操作, 其中, 所述源小区是用户设备 UE的服务小区; 所述源小区根据所述切换准备操作的结果生成已准备切换目标小区的小区 配置, 其中, 所述已准备切换目标小区是所述 UE能够切换的小区;
所述源小区将所述小区配置发送给所述 UE;
在所述源小区接收到所述 UE发送的切换目标小区信息的情况下, 所述源 小区判断所述切换目标小区是否属于所述已准备切换目标小区, 如果判断结果 为否, 则向所述 UE发送切换命令, 其中, 所述切换目标小区信息包括: 所述 切换目标小区的标识和 /或所述切换目标小区的信号强度测量结果;
所述源小区向所述切换目标小区转发所述 UE的用户数据。
32. 根据权利要求 31所述的方法, 其中, 所述 UE至少根据以下信息之一执行切换 准备操作:
所述 UE发送的切换通知信息;
所述源小区获得的所述 UE的移动性统计信息;
所述源小区的负载信息;
所述源小区接收到的其它小区的指示信息, 其中, 所述其它小区为所述源 小区的邻小区。
33. 根据权利要求 31所述的方法,其中, 当所述源小区根据所述切换通知信息执行 所述切换准备操作时, 采用以下方式之一:
所述源小区根据所述切换通知信息, 发起所述源小区与所述切换通知信息 中包含的小区中的预定个数的小区之间的切换准备过程;
所述源小区根据所述切换通知信息, 发起所述源小区与所述切换通知信息 中包含的小区中测量结果最好的小区之间的切换准备过程;
所述源小区根据所述切换通知信息, 发起所述源小区与所述切换通知信息 中包含的小区中预定类型的小区之间的切换准备过程。
34. 根据权利要求 31所述的方法, 其中, 所述小区配置包括:
预定数量的潜在切换目标小区的标识, 以及所述 UE向所述已准备目标小 区发起切换过程所需要的无线资源配置信息。
35. 根据权利要求 31所述的方法,其中,所述源小区向所述切换目标小区转发所述 UE的用户数据, 包括以下方式之一:
所述源小区在成功接收到所述 UE发送的所述切换目标小区信息之后, 向 所述切换目标小区转发所述用户数据;
所述源小区在接收到所述切换目标小区发送的数据转发指示信息后, 向所 述切换目标小区转发所述用户数据;
所述源小区在接收到服务网关发送的终止标记 End Marker后, 向所述切换 目标小区转发所述用户数据。
36. 一种小区切换装置, 位于网络侧的源小区, 其中, 所述源小区是用户设备 UE 的服务小区, 所述装置包括:
执行模块, 设置为执行切换准备操作;
生成模块, 设置为根据所述切换准备操作的结果生成已准备切换目标小区 的小区配置, 其中, 所述已准备切换目标小区是所述 UE能够切换的小区; 发送模块, 设置为将所述小区配置发送给所述 UE;
处理模块, 设置为在接收到所述 UE发送的切换目标小区信息的情况下, 判断所述切换目标小区是否属于所述已准备切换目标小区,如果判断结果为否, 向所述 UE发送切换命令, 其中, 所述切换目标小区信息包括: 所述切换目标 小区的标识和 /或所述切换目标小区的信号强度测量结果;
转发模块, 设置为向所述切换目标小区转发所述 UE的用户数据。
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