WO2012092799A1 - 一种基于多点协作的切换方法及系统 - Google Patents

一种基于多点协作的切换方法及系统 Download PDF

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Publication number
WO2012092799A1
WO2012092799A1 PCT/CN2011/082919 CN2011082919W WO2012092799A1 WO 2012092799 A1 WO2012092799 A1 WO 2012092799A1 CN 2011082919 W CN2011082919 W CN 2011082919W WO 2012092799 A1 WO2012092799 A1 WO 2012092799A1
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WIPO (PCT)
Prior art keywords
cell
target
handover
coordinated
primary cell
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PCT/CN2011/082919
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English (en)
French (fr)
Inventor
樊荣
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中兴通讯股份有限公司
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Publication of WO2012092799A1 publication Critical patent/WO2012092799A1/zh

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Classifications

    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • 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
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]

Definitions

  • the present invention relates to an LTE-A (Long Term Evolution Advanced) system, and in particular to a handover method and system in a CoMP (Cooperative Multi-Point) transmission system.
  • LTE-A Long Term Evolution Advanced
  • CoMP Cooperative Multi-Point
  • the handover procedure is usually completed by the user triggering and base station decision.
  • LTE Long Term Evolution
  • the UE User Equipment
  • one of the main application modes is: the UE measures the current serving cell and the neighboring cell of the serving cell.
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal Receiving Quality
  • the handover process is triggered.
  • complex information interaction and signaling transmission between the UE, the source cell/base station, and the target cell/base station are required.
  • LTE uses a fast hard handover mechanism, that is, the UE only has a radio link connection with one cell at any time, so that when the UE is at the cell edge (the area where the handover may occur is usually the cell edge, the radio channel quality is poor, the small interval The interference is strong), the switching success rate is lower than that of soft switching, the throughput of the system will also decrease when switching, and the switching interruption delay will increase.
  • the technical problem to be solved by the present invention is to provide a CoMP-based switching method and system, High handover success rate and throughput of the system during handover, while reducing handover interruption latency.
  • the present invention provides a handover method based on multi-point cooperation, including: after receiving a measurement report reported by a terminal, the source primary cell determines a target primary cell, and sends a handover request message to the target primary cell; After receiving the handover request message, the target primary cell allocates resources for the terminal, and determines the final after the terminal switches to the target primary cell or after the terminal switches to the target primary cell. Target coordinated cell set and target switched cell set.
  • the method of the present invention may further have the following feature: the source primary cell may determine the target primary cell in the following manner: the source cell selects one cell from a class of cells with the highest priority among the cells carried in the measurement report.
  • the target primary cell where the priority principle may be: the priority of the cell in the source switching cell set > the priority of the other cell, and the priority of the cell belonging to the same evolved Node B (eNodeB) as the source primary cell > the cell
  • eNodeB evolved Node B
  • the priority of the cell in which the eNodeB and the eNodeB where the source primary cell is located are connected to the X2 port > the priority of other cells.
  • the method of the present invention may also be characterized in that if the cell with the highest priority among the cells carried in the measurement report belongs to the source handover cell set, the cell with the lowest load is selected as the target primary cell; A cell with the highest priority among the cells carried in the cell does not belong to the source handover cell set, and one cell is randomly selected as the target primary cell.
  • the method of the present invention may further have the following feature: the target primary cell determining the target coordinated cell set and the target handover cell set may include: the target primary cell selecting a target coordinated cell set, and each target coordinated cell in the target coordinated cell set Sending a coordinated cell request message, when receiving the reject message of the target coordinated cell, deleting the target coordinated cell that sends the reject message from the target coordinated cell set to obtain a final target coordinated cell set; the target primary cell Selecting a target handover cell set, and sending a handover cell request message to each target handover cell in the target handover cell set, and when receiving the reject message of the target handover cell, switching the target handover cell that sends the rejection message from the target The cells are collectively deleted, and the final target handover cell set is obtained.
  • the method of the present invention may further have the following feature: the target primary cell may select a target coordinated cell set and a target switched cell set according to the following manner:
  • the method of the present invention may further have the following feature: the target primary cell may select a target coordinated cell set and a target switched cell set according to the following manner:
  • the cell and the measurement content are sent to the source primary cell by using a handover response message, and the source primary cell sends the terminal by using a reconfiguration message; or directly sending the cell and measurement content that needs to be measured to the terminal;
  • the target primary cell receives a channel condition measurement result reported by the terminal after switching to the target primary cell, and selects a target coordinated cell set and a target switched cell set according to the channel condition measurement result.
  • the method of the present invention may also have the following features.
  • selecting a target coordinated cell set the connection relationship between the candidate cell and the target primary cell may also be referred to.
  • the target handover cell set the candidate cell and the target may also be referred to.
  • the method of the present invention may further have the following features, the method may further include: the target primary cell further transmitting, by the source primary cell, the information about determining the final target coordinated cell set and the target handover cell set to the terminal; Alternatively, the information determining the final target coordinated cell set and the target handover cell set is directly sent to the terminal.
  • the present invention also provides a handover system based on multipoint cooperation, including a source primary cell and a target primary cell, where:
  • the source primary cell is configured to: after receiving the measurement report reported by the terminal, determine the target primary cell, and send a handover request message to the target primary cell;
  • the target primary cell is configured to allocate resources for the terminal after receiving the handover request message, before the terminal switches to the target primary cell or switch to the destination at the terminal After the primary cell is marked, the final target coordinated cell set and the target switched cell set are determined.
  • the source primary cell may include a target primary cell determining unit:
  • the target primary cell determining unit is configured to: select one cell as the target primary cell among the cells of the highest priority among the cells carried in the measurement report, where the priority principle is:
  • the system of the present invention may further have the following feature: the target primary cell determining unit is further configured to: if the cell with the highest priority among the cells carried in the measurement report belongs to the source switching cell set, select a load from the system The lowest cell is used as the target primary cell; if the cell with the highest priority among the cells carried in the measurement report does not belong to the source handover cell set, one cell is randomly selected as the target primary cell.
  • the target primary cell may include a selecting unit: the selecting unit is configured to: select a target coordinated cell set, and send a coordinated cell request to each target coordinated cell in the selected target coordinated cell set. a message, when receiving the reject message of the target coordinated cell, deleting the target coordinated cell that sends the reject message from the target coordinated cell set to obtain a final target coordinated cell set;
  • the system of the present invention may further have the following features, the selecting unit is further configured to: according to the source collaboration d, the zone set information, the source switching d, the zone set information, and the measurement report of the terminal on the terminal carried in the handover request message.
  • the other cell information selects a target coordinated cell set and a target switched cell set.
  • the target primary cell may further include a measurement trigger unit, where: The measurement triggering unit is configured to: determine a cell to be measured and measurement content according to the source coordinated cell set information, the source switching cell set information, and other cell information in the measurement report reported by the terminal, where the handover request message is The cell to be measured and the measurement content are sent to the source primary cell by using the handover response information, and the source primary cell sends the terminal through the reconfiguration message; or directly sends the cell and measurement content that needs to be measured to the terminal;
  • the selecting unit is further configured to receive a channel condition measurement result reported by the terminal after being switched to the target primary cell, and select a target coordinated cell set and a target switched cell set according to the channel condition measurement result.
  • the system of the present invention may further have the following features: the selecting unit is further configured to: when selecting a target coordinated cell set, refer to a connection relationship between the candidate cell and the target primary cell, and when selecting the target switching cell set, refer to the candidate cell to collaborate with the target.
  • the connection relationship of the cells in the cell concentration refer to a connection relationship between the candidate cell and the target primary cell.
  • the system of the present invention may further have the following feature: the target primary cell is further configured to: send, by the source primary cell, the information about determining the final target coordinated cell set and the target handover cell set to the terminal; or directly The information determining the final target coordinated cell set and the target handover cell set is sent to the terminal.
  • the embodiment of the present invention provides a complete handover procedure when the target cell of the UE does not belong to the original CoMP coordinated cell set, and may relate to related parameters of each step operation during handover, and may relate to a method for selecting a target primary cell, which may involve The method of selecting a CoMP cell set and switching a cell set by directly selecting or measuring the UE on the UE after the handover and the handover may involve a process when the target cell selects a CoMP coordinated cell.
  • the active secondary cell/primary cell continues to transmit data for the UE, which can reduce the handover interruption delay, improve the system throughput during handover, and after switching or after handover.
  • the CoMP cell set and the handover cell set are reselected for the UE, so that the UE can obtain the same service after the handover.
  • FIG. 1 is a general flow chart of switching according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a coordinated cell set and a handover cell set
  • FIG. 3 is a schematic diagram of selection of a target primary cell (belonging to a source handover cell set) according to an embodiment of the present invention
  • 4 is a schematic diagram of selecting a target primary cell (belonging to other cells) according to an embodiment of the present invention
  • FIG. 5 is a handover procedure for directly selecting a target side cell set in a handover according to an embodiment of the present invention
  • FIG. The process of selecting the target side cell set is switched.
  • FIG. 7 is a process for directly selecting the target side cell set after the handover according to the embodiment of the present invention;
  • FIG. 8 is a handover process of selecting the target side cell set by measurement after the handover according to the embodiment of the present invention
  • FIG. 9 is a schematic diagram of each cell set after handover (the target primary cell belongs to a source switching cell set) according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of each cell set after handover (the target primary cell belongs to another cell) according to an embodiment of the present invention.
  • the concepts may be specifically: a source coordinated cell set, a source primary cell, a source secondary cell, and a source switching small cell set.
  • the selection of the primary cell, the secondary cell, the coordinated cell set, and the handover cell set when the UE performs handover is within the scope of the present invention. Accordingly, the concepts may be specifically: a target coordinated cell set, a target primary cell, a target secondary cell, and a target handover cell set. .
  • An embodiment of the present invention provides a handover method based on multipoint cooperation, including:
  • the source primary cell After receiving the measurement report reported by the terminal, the source primary cell determines the target primary cell, and sends a handover request message to the target primary cell.
  • the target primary cell After receiving the handover request message, the target primary cell allocates resources for the terminal, and determines a target before the terminal switches to the target primary cell or after the terminal switches to the target primary cell. Cooperative cell set and target handover cell set.
  • the triggering method is similar to the existing method.
  • the UE reports the measurement report format, measures and reports the content, and can select any combination of RSRP/RSRQ/SINR (Signal to Interference plus Noise Ratio).
  • the RSRP/RSRQ/SINR of the cell falls below a certain threshold, and/or the RSRP/RSRQ/SINR of other cells (cells outside the coordinated cell set) rises above a certain threshold and continues for a certain period of time.
  • the source primary cell receives the measurement report sent by the UE, and the measurement report carries information of one or more cells whose RSRP/RSRQ/SINR meets the handover threshold.
  • the source primary cell determines a target primary cell: the source cell selects one cell from the cell with the highest priority among the cells carried in the measurement report as the target primary cell, where the priority principle is:
  • the selection steps include:
  • the source primary cell filters or sorts the cells in the measurement report according to the priority principle of "cells in the source switching cell group> other cells".
  • the source primary cell has the priority principle of "X2 port connection > other cell" in the eNodeB where the cell belongs to the same eNodeB (Evolved Node B) and the eNodeB where the cell is located.
  • the cells selected in the previous stage are again filtered or sorted, or the cells sorted by the previous stage are again selected or sorted in each category.
  • the selected cell or the class of the highest priority class belongs to the source switching cell set, the cell with the lowest load is selected as the target primary cell, and may also be randomly selected; if not belonging to the source switching cell set, A cell is randomly selected as the target primary cell.
  • the source primary cell After determining the target primary cell, the source primary cell sends a handover request message to the target primary cell, in the message.
  • the information includes, but is not limited to, the following: the service bearer information of the UE, the handover type, the handover reason, the security information of the UE, the radio access capability information of the UE, the access layer configuration, and the radio resource configuration.
  • the source coordinated cell set information, the source switching cell set information, and the information of other cells in the measurement are carried.
  • the target primary cell After receiving the handover request message, the target primary cell allocates resources for the UE to be switched. Optionally, the target primary cell determines the target coordinated cell set and the target handover cell set according to the related information in the request message, or determines (requires the cell set required) the cell and measurement content that the UE needs to measure. Whether this step will be selected and which operation is specifically performed after the selection depends on the timing and selection of the target coordinated cell set and the target switched cell set. The target primary cell sends a handover response message to the source primary cell.
  • the message includes, but is not limited to, the following information: the UE service bearer information of the success and acceptance failure, the new measurement configuration, and the C-RNTI (Cell-Radio Network Temporary Identifier) allocated by the target primary cell to the UE. ), random access channel resource information, and security-related configuration.
  • the source primary cell After receiving the handover response message, the source primary cell sends a reconfiguration message to the UE, where the message includes but is not limited to the following information: a DRB (Data Radio Bearer) and a SRB (Signal Radio Bearer) that have been established in the target primary cell.
  • the target coordinated cell set and the target handover cell set information selected by the UE are carried by the target primary cell, or the cell and measurement content measured by the UE are required.
  • the UE After receiving the reconfiguration message, the UE compares the local DRB information with the DRB information in the reconfiguration message to release the redundant DRB. Then, the UE synchronizes to the target primary cell and initiates random access to the target primary cell. After the random access succeeds, the UE sends a reconfiguration complete message to the target primary cell. If the reconfiguration message sent by the source primary cell to the UE carries the target coordinated cell set information selected by the target primary cell for the UE, after the UE successfully switches, the target coordinated cell set is used to transmit data. If the re-matching message sent by the source primary cell to the UE carries the cell and the measurement content measured by the UE, the UE performs the measurement and reports the channel state measurement result to the target primary cell.
  • the target primary cell starts to select the target coordinated cell set and the target switched cell set. If the target primary cell fails to allocate resources to the UE after receiving the handover request message sent by the source primary cell, it responds to the handover preparation failure message to the source primary cell, and the source primary cell reselects the target primary cell, and then performs handover again.
  • the target coordinated cell set and the target handover cell set are selected by the target primary cell.
  • the target primary cell performs selection of the target cell set and the target handover cell set, or receives the UE's weight.
  • the selection of the target cell set and the target handover cell set is performed.
  • the selection of the target handover cell set is performed after the selection of the target coordinated cell set.
  • the target primary cell directly performs the target coordinated cell according to the source coordinated cell set information, the source handover cell set information, and the information of other cells in the measurement report in the handover request message, considering the signal strength, load, and path loss of the cell.
  • the selection of the target coordinated cell set needs to consider the connection relationship between the cell and the target primary cell (the same eNodeB as the target primary cell > the eNodeB where the cell is located and the eNodeB where the target primary cell is located), and the target handover
  • the selection of the cell set needs to consider the connection relationship between the cell and the target cooperative centralized cell.
  • the target primary cell refers to the source coordinated cell set information, the source handover cell set information, and the information of other cells in the measurement report, and then performs the target coordinated cell set and the target switched cell by using the UE to report the measurement information in real time.
  • the selection of the set Specifically, the target primary cell requires the UE to measure the channel status of the specified cell, and the measurement content includes but is not limited to RSRP, RSRQ, SINR, CQI, and path loss.
  • the target primary cell comprehensively considers the channel condition and load information of each cell, and determines the target coordinated cell set and the target handover cell set.
  • the selection of the target coordinated cell set needs to consider the connection relationship between the cell and the target primary cell, and the selection of the target handover cell set needs to consider the connection relationship between the cell and the target cooperative centralized cell.
  • the target primary cell After the target coordinated cell set is determined, the target primary cell sends a coordinated cell request message to the cell in the target coordinated cell set, where the message includes but is not limited to the following information: all resource configuration information of the UE to be served, and information type that the cell needs to feedback in real time (such as: wireless resource usage, wired Resource usage status), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable in real-time feedback), feedback period (periodic feedback).
  • information type that the cell needs to feedback in real time Such as: wireless resource usage, wired Resource usage status), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable in real-time feedback), feedback period (periodic feedback).
  • the target coordinated cell After receiving the coordinated cell request message, the target coordinated cell determines whether it is willing to act as a secondary cell. If it is willing, it allocates resources according to the information of the UE and responds to the cooperative acceptance message, and then performs information feedback according to the feedback request.
  • the target primary cell deletes the cell from the coordinated cell set.
  • the target primary cell informs the UE that the coordinated cell set has changed.
  • the target primary cell sends a handover cell request message to the cell in the target handover cell set, and the message includes but is not limited to the following information: information type of the request feedback (eg, radio resource usage status, wired resource usage) Status), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable during real-time feedback), feedback period (periodic feedback).
  • information type of the request feedback eg, radio resource usage status, wired resource usage
  • type of feedback real-time feedback, periodic feedback
  • feedback threshold selectiveable during real-time feedback
  • feedback period periodic feedback
  • the target handover cell After receiving the handover cell request message, the target handover cell responds to the handover cell accept message, and then performs information feedback according to the feedback request.
  • the target primary cell deletes the cell from the handover cell set.
  • the target primary cell informs the UE that the handover cell set has changed.
  • Cooperative cell set CoMP cooperating set, a set of cells used to serve the same UE, such as cells 1, 2, and 3 in Figure 2.
  • the primary cell a cell in which the coordinated cell is concentrated, performs unified scheduling of all cell resources in the coordinated cell, and has signaling interaction with the UE, such as cell 1 in FIG.
  • Secondary cell A cell in which the coordinated cell is concentrated, and assists the primary cell to serve the UE, such as cells 2 and 3 in FIG.
  • Switching cell set The cell in the set meets, but is not limited to, the following conditions: The neighboring cell belonging to each cell in the coordinated cell set has a signal strength higher than a preset first threshold, and the cell load is lower than a preset second threshold. (Optionally, the second threshold varies in real time or periodically according to the resource usage of the UE, and accordingly the handover cell set also changes in real time or periodically).
  • the primary cell has load information for these cells.
  • the handover cell set may be jointly determined by the UE, the primary cell, and the secondary cell. As shown in Figure 2, cells 5, 6, 7, 8, 10, 12. However, the cells 9, 11, and 14 in FIG. 2 cannot belong to the handover cell set due to insufficient signal strength, heavy load, or other reasons (for example, the number of handover cell sets).
  • Embodiment 1 Selection of target primary cell
  • the source primary cell receives the measurement report sent by the UE, and the cells carried in the report are: cell 5, cell 6, cell 7, and cell 16. Since the cells 5, 6, and 7 belong to the source handover cell set, they are preferentially used as candidate cells of the target primary cell. Since the cells 6 and 7 and the source primary cell 1 belong to the same eNodeB, a smaller load is selected from the cell 6 and the cell 7 as the target primary cell.
  • Embodiment 2 Selection of target primary cell
  • the source primary cell receives the measurement report sent by the UE, and the cells carried in the report include: cell 4, cell 13, and cell 14, all of which belong to other cells. Since only the cell 4 and the source primary cell 1 belong to the same eNodeB, it is preferentially selected as the target primary cell.
  • Embodiment 3 Selecting the switching mode of the target side cell set directly in the handover
  • the source primary cell after the source primary cell selects the target primary cell, it sends a handover request message to the target primary cell, where the message includes but is not limited to the following information: the service bearer information of the UE, the handover type, the handover reason, and the security information of the UE.
  • the target primary cell After receiving the handover request message, the target primary cell allocates resources for the UE to be switched, and according to the source coordinated cell set information, the source switch d, the zone set information, and the information of other cells in the handover request message, Considering the signal strength, load, path loss and connection relationship with the target primary cell of these cells, the target coordinated cell set is selected, and then the target switching cell set is selected considering the connection relationship between the cells and the target cooperative centralized cell.
  • the target primary cell sends a coordinated cell request message to the cell in the target coordinated cell set, where the message includes but is not limited to the following information: all resource configuration information of the UE to be served, and information type that the cell needs to feedback in real time (eg, radio resource usage status, Wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable for real-time feedback), feedback period (periodic feedback).
  • information type that the cell needs to feedback in real time (eg, radio resource usage status, Wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable for real-time feedback), feedback period (periodic feedback).
  • the target coordinated cell After receiving the coordinated cell request message, the target coordinated cell determines whether it is willing to act as a secondary cell. If it is willing, it performs resource allocation according to the information of the UE and responds to the coordinated cell accept message, and then performs information feedback according to the feedback request.
  • the cell in the target handover cell set is filtered, and then the target primary cell sends a handover cell request message to the cell in the target handover cell set, where the message includes but is not limited to the following information: Type (eg: radio resource usage, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable for real-time feedback), feedback period (periodic feedback).
  • Type eg: radio resource usage, wired resource usage
  • type of feedback real-time feedback, periodic feedback
  • feedback threshold selective for real-time feedback
  • feedback period periodic feedback
  • the target handover cell After receiving the handover cell request message, the target handover cell responds to the handover cell accept message, and then performs information feedback according to the feedback request.
  • the target primary cell sends a handover response message to the source primary cell.
  • the message includes, but is not limited to, the following information: the UE service bearer information of the success and acceptance failure, the new measurement configuration, and the C-RNTI (Cell-Radio Network Temporary Identifier) allocated by the target primary cell to the UE. And, the random access channel resource information, and the security-related configuration, and carrying the target coordinated cell set and the target handover cell set information selected by the target primary cell for the UE.
  • the source primary cell After receiving the handover response message, the source primary cell sends a reconfiguration message to the UE, where the message includes but is not limited to the following information: a DRB (Data Radio Bearer) and a SRB (Signal Radio Bearer) that have been established in the target primary cell. Signaling radio bearer) information, new measurement configuration, destination The C-RNTI, the random access channel resource information, and the security-related configuration allocated by the primary cell to the UE, and carrying the target coordinated cell set and the target handover cell set information selected by the target primary cell for the UE.
  • a DRB Data Radio Bearer
  • SRB Synchrom Radio Bearer
  • the UE After receiving the reconfiguration message, the UE compares the local DRB information with the DRB information in the reconfiguration message to release the redundant DRB. Then, the UE synchronizes to the target primary cell and initiates random access to the target primary cell. After the random access succeeds, the UE sends a reconfiguration complete message to the target primary cell. At this point, the UE handover succeeds and the data is transmitted with the latest coordinated cell set.
  • Embodiment 4 Switching mode of selecting a target side cell set by measurement in handover
  • the source primary cell after the source primary cell selects the target primary cell, it sends a handover request message to the target primary cell, where the message includes but is not limited to the following information: the service bearer information of the UE, the handover type, the handover reason, and the security information of the UE.
  • the target primary cell After receiving the handover request message, the target primary cell allocates resources for the UE to be switched, and according to the source coordinated cell set information, the source switch d, the zone set information, and the information of other cells in the handover request message, Determine the cell and measurement content that the UE needs to measure.
  • the target primary cell sends a handover response message to the source primary cell.
  • the message includes, but is not limited to, the following information: the UE service bearer information of the success and acceptance failure, the new measurement configuration, and the C-RNTI (Cell-Radio Network Temporary Identifier) allocated by the target primary cell to the UE. ), random access channel resource information, and security-related configuration, and carrying cells and measurement content that need to be measured by the UE.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • the source primary cell After receiving the handover response message, the source primary cell sends a reconfiguration message to the UE, where the message includes but is not limited to the following information: a DRB (Data Radio Bearer) and a SRB (Signal Radio Bearer) that have been established in the target primary cell.
  • the UE After receiving the reconfiguration message, the UE compares the local DRB information with the DRB information in the reconfiguration message to release the redundant DRB. Then synchronizing to the target primary cell and initiating random access to the target primary cell, After the random access is successful, the UE sends a reconfiguration complete message to the target primary cell. At this point, the UE handover is successful, but at this time, data transmission can only be performed with the target primary cell.
  • the UE performs measurement and reports the channel state measurement result to the target primary cell.
  • the target primary cell selects the target coordinated cell set based on the reported signal strength, load, path loss, and connection relationship with the target primary cell according to the reported measurement result, and then selects the target switching cell by considering the connection relationship between the cells and the target cooperative centralized cell. set.
  • the target primary cell sends a coordinated cell set request message to the cell in the target coordinated cell set, and the message includes, but is not limited to, the following information: all resource configuration information of the UE that is required for the monthly service, and information type that the cell needs to feedback in real time (eg, radio resource) Usage status, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable during real-time feedback), feedback period (periodic feedback).
  • the target cooperative cell determines whether it is willing to act as a secondary cell. If it is willing, it performs resource allocation according to the information of the UE and responds to the cooperation acceptance message, and then performs feedback according to the feedback request.
  • the target primary cell notifies the UE that the coordinated small cell set changes through the reconfiguration message, and the UE returns a reconfiguration complete message to the target primary cell. So far, the UE transmits data with the latest set of cooperative cells.
  • the cell in the target handover cell set is filtered, and then the target primary cell sends a handover cell request message to the cell in the target handover cell set, where the message includes but is not limited to the following information: Type (eg: radio resource usage, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable for real-time feedback), feedback period (periodic feedback).
  • Type eg: radio resource usage, wired resource usage
  • type of feedback real-time feedback, periodic feedback
  • feedback threshold selective for real-time feedback
  • feedback period periodic feedback
  • the target handover cell responds to the handover cell accept message, and then performs information feedback according to the feedback request.
  • the target primary cell informs the UE of the change of the cell set through the reconfiguration message.
  • the UE returns a reconfiguration complete message to the target primary cell.
  • Embodiment 5 Selecting the switching mode of the target side cell set directly after switching
  • the source primary cell After the source primary cell selects the target primary cell, it sends a handover request message to the target primary cell, where the message includes but is not limited to the following information: the service bearer information of the UE, the handover type, the handover reason, and the security information of the UE. , UE wireless access capability information, access layer configuration, and wireless resources Source configuration, source coordinated cell set information, source switching cell set information, and information of other cells in the measurement report.
  • the target primary cell After receiving the handover request message, the target primary cell allocates resources for the UE to be switched. A handover response message is then sent to the source primary cell.
  • the message includes, but is not limited to, the following information: UE service bearer information for accepting success and acceptance failure, new measurement configuration, C-RNTI allocated by the target primary cell for the UE (Cell-Radio Network Temporary Identifier, cell-related wireless network temporary identifier) ), random access channel resource information, and security-related configuration.
  • the source primary cell After receiving the handover response message, the source primary cell sends a reconfiguration message to the UE, where the message includes but is not limited to the following information: a DRB (Data Radio Bearer) and a SRB (Signal Radio Bearer) that have been established in the target primary cell. Signaling radio bearer) information, new measurement configuration, C-RNTI allocated by the target primary cell for the UE, random access channel resource information, and security related configuration.
  • DRB Data Radio Bearer
  • SRB Signaling radio bearer
  • the UE After receiving the reconfiguration message, the UE compares the local DRB information with the DRB information in the reconfiguration message to release the redundant DRB. Then, the UE synchronizes to the target primary cell and initiates random access to the target primary cell. After the random access succeeds, the UE sends a reconfiguration complete message to the target primary cell. At this point, the UE handover is successful, but at this time, data transmission can only be performed with the target primary cell.
  • the primary cell comprehensively considers the signal strength, load, path loss, and target of the cells according to the source coordinated cell set information, the source handover cell set information, and the information of other cells in the measurement request message.
  • the cell connection relationship selects the target coordinated cell set, and then considers the connection relationship between the cells and the target cooperative centralized cell to select the target handover cell set.
  • the target primary cell sends a coordinated cell set request message to the cell in the target coordinated cell set, and the message includes, but is not limited to, the following information: all resource configuration information of the UE that is required for the monthly service, and information type that the cell needs to feedback in real time (eg, radio resource) Usage status, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable during real-time feedback), feedback period (periodic feedback).
  • real time eg, radio resource
  • periodic feedback electable during real-time feedback
  • feedback period periodic feedback
  • the target coordinated cell After receiving the cooperation request message, the target coordinated cell determines whether it is willing to act as a secondary cell. If it is willing, it allocates resources according to the information of the UE and responds to the cooperation acceptance message, and then performs feedback according to the feedback request.
  • the target primary cell informs the UE that the coordinated cell set has changed. So far, the UE transmits data in the latest coordinated cell set.
  • the cell in the target handover cell set is filtered, and then the target primary cell sends a handover cell request message to the cell in the target handover cell set, where the message includes but is not limited to the following information: Type (eg: radio resource usage, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable for real-time feedback), feedback period (periodic feedback).
  • Type eg: radio resource usage, wired resource usage
  • type of feedback real-time feedback, periodic feedback
  • feedback threshold selective for real-time feedback
  • feedback period periodic feedback
  • the target handover cell After receiving the handover cell request message, the target handover cell responds to the handover cell accept message, and then performs information feedback according to the feedback request.
  • the target primary cell notifies the UE that the handover cell set has changed.
  • Embodiment 6 Selecting a handover mode of a target side cell set by measurement after handover
  • the source primary cell after the source primary cell selects the target primary cell, it sends a handover request message to the target primary cell, where the message includes but is not limited to the following information: the service bearer information of the UE, the handover type, the handover reason, and the security information of the UE.
  • the target primary cell After receiving the handover request message, the target primary cell allocates resources for the UE to be switched. A handover response message is then sent to the source primary cell.
  • the message includes, but is not limited to, the following information: UE service bearer information for accepting success and acceptance failure, new measurement configuration, C-RNTI allocated by the target primary cell for the UE (Cell-Radio Network Temporary Identifier, cell-related wireless network temporary identifier) ), random access channel resource information, and security-related configuration.
  • the source primary cell After receiving the handover response message, the source primary cell sends a reconfiguration message to the UE, where the message includes but is not limited to the following information: a DRB (Data Radio Bearer) and a SRB (Signal Radio Bearer) that have been established in the target primary cell. Signaling radio bearer) information, new measurement configuration, C-RNTI allocated by the target primary cell for the UE, random access channel resource information, and security related configuration.
  • DRB Data Radio Bearer
  • SRB Signaling radio bearer
  • the UE After receiving the reconfiguration message, the UE compares the local DRB information with the DRB information in the reconfiguration message to release the redundant DRB. Then, the UE synchronizes to the target primary cell and initiates random access to the target primary cell. After the random access succeeds, the UE sends a reconfiguration complete message to the target primary cell. At this point, the UE handover is successful, but at this time, data transmission can only be performed with the target primary cell. At this time, the target primary cell according to the source coordinated cell set information in the previous handover request message, the source cut The cell set information and the information of other cells in the measurement report are exchanged, and the cell and measurement content that the UE needs to measure are determined.
  • the retransmission message is sent to the UE, and the UE is required to measure the channel status of the specified cell, including but not limited to RSRP, RSRQ, SINR, CQI, and path loss.
  • the UE After receiving the reconfiguration message, the UE performs measurement and reports the channel state measurement result to the target primary cell.
  • the target primary cell selects the target coordinated cell set based on the reported signal strength, load, path loss, and connection relationship with the target primary cell according to the reported measurement result, and then selects the target switching cell by considering the connection relationship between the cells and the target cooperative centralized cell. set.
  • the target primary cell sends a coordinated cell set request message to the cell in the target coordinated cell set, and the message includes, but is not limited to, the following information: all resource configuration information of the UE that is required for the monthly service, and information type that the cell needs to feedback in real time (eg, radio resource) Usage status, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable during real-time feedback), feedback period (periodic feedback).
  • the target coordinated cell determines whether it is willing to act as a secondary cell. If it is willing, it allocates resources according to the information of the UE and responds to the cooperation acceptance message, and then performs information feedback according to the feedback request.
  • the target primary cell informs the UE that the coordinated cell set has changed. So far, the UE transmits data in the latest coordinated cell set.
  • the cell in the target handover cell set is filtered, and then the target primary cell sends a handover cell request message to the cell in the target handover cell set, where the message includes but is not limited to the following information: Type (eg: radio resource usage, wired resource usage), type of feedback (real-time feedback, periodic feedback), feedback threshold (selectable for real-time feedback), feedback period (periodic feedback).
  • the target handover cell responds to the handover cell accept message, and then performs information feedback according to the feedback request.
  • the target primary cell informs the UE that the handover cell set has changed.
  • Embodiment 7 Selecting a target coordinated cell and a target handover cell
  • the cell 6 is a target primary cell
  • 5 is a target secondary cell (a cell in which the source switching cell is concentrated)
  • the cells 4, 7, 15, 16, 17 are home target switching cell sets.
  • the cells 2, 3, and 14 are the neighboring cells of the target coordinated cell centralized cell, but cannot be attributed to the target switching cell set due to insufficient signal strength. Although the cell strength condition is satisfied, the cell 18 is negative. The load is heavier and cannot be attributed to the target handover cell set.
  • the present invention also provides a handover system based on multipoint cooperation, including a source primary cell and a target primary cell, where:
  • the source primary cell is configured to: after receiving the measurement report reported by the terminal, determine the target primary cell, and send a handover request message to the target primary cell;
  • the target primary cell is configured to allocate resources to the terminal after receiving the handover request message, before the terminal switches to the target primary cell or after the terminal switches to the target primary cell , determining a target coordinated cell set and a target switching cell set.
  • the source primary cell includes a target primary cell determining unit:
  • the target primary cell determining unit is configured to: select one cell as the target primary cell among the cells of the highest priority among the cells carried in the measurement report, where the priority principle is:
  • the target primary cell determining unit is further configured to: if the cell with the highest priority among the cells carried in the measurement report belongs to the source switching cell set, select the cell with the lowest load as the target primary cell; A cell of the highest priority among the cells carried in the measurement report does not belong to the source handover cell set, and one cell is randomly selected as the target primary cell.
  • the target primary cell includes a selection unit:
  • the selecting unit is configured to: select a target coordinated cell set, and select the selected target coordinated cell set And transmitting, by the target coordinated cell, a coordinated cell request message, and when receiving the reject message of the target coordinated cell, deleting the target coordinated cell from the target coordinated cell to obtain a final target coordinated cell set;
  • the selecting unit is further configured to select the target cooperative cell set and the target switching cell set according to the source coordinated cell set information, the source switching cell set information, and other cell information in the measurement report reported by the terminal.
  • the target primary cell further includes a measurement trigger unit, where:
  • the measurement triggering unit is configured to: determine a cell to be measured and measurement content according to the source coordinated cell set information, the source switching cell set information, and other cell information in the measurement report reported by the terminal, where the handover request message is The cell to be measured and the measurement content are sent to the source primary cell by using the handover response information, and the source primary cell sends the terminal through the reconfiguration message; or directly sends the cell and measurement content that needs to be measured to the terminal;
  • the selecting unit is further configured to receive a channel condition measurement result reported by the terminal after being switched to the target primary cell, and select a target coordinated cell set and a target switched cell set according to the channel condition measurement result.
  • the selecting unit is further configured to: when selecting a target coordinated cell set, refer to a connection relationship between the candidate cell and the target primary cell, and select a connection relationship between the candidate cell and the target coordinated cell when the target switching cell set is selected.
  • the target primary cell is further configured to: send, by using the source primary cell, the target coordinated cell set information and the target handover cell set information to the terminal; or directly, the target coordinated cell set information and the target switched cell.
  • the set information is sent to the terminal.
  • the present invention provides a method in which when a target cell of a UE does not belong to an original CoMP coordinated cell set
  • the method relates to a process when the target cell selects a CoMP coordinated cell.
  • the active secondary cell/primary cell continues to transmit data for the UE, which can reduce handover interruption delay, improve system throughput during handover, and be UE in handover or after handover.
  • the CoMP cell set and the handover cell set are reselected so that the UE can obtain the same service after the handover.

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Abstract

本发明提供一种基于多点协作的切换方法，包括：源主小区收到终端上报的测量报告后，确定目标主小区，向所述目标主小区发送切换请求消息；所述目标主小区在接收到所述切换请求消息后，为所述终端分配资源，在所述终端切换到所述目标主小区前或者在所述终端切换到所述目标主小区后，和目标切换小区集集和目标切换小区集。本发明还提供一种基于多点协作的切换系统。本发明可减少切换中断时延，提高切换时的系统吞吐量，且切换中或切换后为UE重新选择CoMP小区集和切换小区集，使得UE在切换后可以获得相同的服务。

Description

一种基于多点协作的切换方法及系统
技术领域
本发明涉及 LTE— A ( Long Term Evolution Advanced, 高级长期演进 )系 统， 具体涉及在 CoMP ( Cooperative Multi-Point, 多点协作）传输系统中的 切换方法及系统。
背景技术
在现有移动通信系统的切换场景中， 通常由用户触发、 基站决策来完成 切换流程。 对于 LTE ( Long Term Evolution, 长期演进） 系统， UE ( User Equipment , 用户设备）在与当前的服务小区进行通信时， 其中一种主要应用 方式为： UE测量当前服务小区以及服务小区的相邻小区的 RSRP ( Reference Signal Receiving Power, 参考信号接收功率） 或 RSRQ ( Reference Signal Receiving Quality, 参考信号接收质量） ， 当 UE 测量发现当前连接基站的 RSRP或 RSRQ下降到一定门限值以下， 且 /或相邻小区中某一小区的 RSRP 或 RSRQ上升到一定门限值以上并持续一定时间后， 触发切换流程。 切换过 程中需要经过 UE、 源小区 /基站、 目标小区 /基站间复杂的信息交互和信令传 输。
由于 LTE使用快速硬切换机制， 即任何时候 UE仅和一个小区存在无线 链路连接， 这样当 UE处于小区边缘时 （可能发生切换的区域通常是小区边 缘， 此时无线信道质量较差， 小区间干扰强） ， 切换成功率相较于软切换有 所降低， 切换时系统的吞吐量也会下降， 而切换中断时延会增加。
在 LTE— A中引入 CoMP传输技术后， 切换场景及流程将发生改变。 目 前尚没有公开当 UE的目标小区不属于原来的 CoMP协作小区集时完整的切 换方法。
发明内容
本发明要解决的技术问题是提供一种基于 CoMP的切换方法和系统， 提 高切换成功率和切换时系统的吞吐量， 同时减少切换中断时延。 为了解决上述问题，本发明提供了一种基于多点协作的切换方法， 包括： 源主小区收到终端上报的测量报告后， 确定目标主小区， 向所述目标主 小区发送切换请求消息； 所述目标主小区在接收到所述切换请求消息后， 为所述终端分配资源， 在所述终端切换到所述目标主小区前或者在所述终端切换到所述目标主小区 后， 确定最终的目标协作小区集和目标切换小区集。 本发明的方法还可具有以下特点， 所述源主小区可以按如下方式确定目 标主小区： 所述源小区从所述测量报告中携带的小区中优先级最高的一类小 区中选择一个小区作为目标主小区， 其中， 优先级原则可为： 源切换小区集中的小区的优先级 >其他小区的优先级， 且与源主小区属 于同一个演进节点 B ( eNodeB ) 的小区的优先级>小区所在 eNodeB与源主 小区所在 eNodeB存在 X2口连接的小区的优先级>其他小区的优先级。 本发明的方法还可具有以下特点， 若所述测量报告中携带的小区中优先 级最高的一类小区属于源切换小区集， 则从中选取负荷最低的小区作为目标 主小区； 若所述测量报告中携带的小区中优先级最高的一类小区不属于源切 换小区集， 则从中随机选取一个小区作为目标主小区。 本发明的方法还可具有以下特点， 所述目标主小区确定目标协作小区集 和目标切换小区集可包括： 所述目标主小区选取目标协作小区集， 向目标协作小区集中的每个目标 协作小区发送协作小区请求消息， 接收到所述目标协作小区的拒绝消息时， 将发送所述拒绝消息的目标协作小区从所述目标协作小区集中删除， 得到最 终的目标协作小区集； 所述目标主小区选取目标切换小区集， 向目标切换小区集中的每个目标 切换小区发送切换小区请求消息， 接收到所述目标切换小区的拒绝消息时， 将发送所述拒绝消息的目标切换小区从所述目标切换小区集中删除， 得到最 终的目标切换小区集。 本发明的方法还可具有以下特点， 所述目标主小区可以根据如下方式选 取目标协作小区集和目标切换小区集：
所述目标主小区根据所述切换请求消息中携带的源协作小区集信息、 源 切换小区集信息以及终端上报的测量报告中其他小区信息选取目标协作小区 集和目标切换小区集。 本发明的方法还可具有以下特点， 所述目标主小区可以根据如下方式选 取目标协作小区集和目标切换小区集：
所述目标主小区根据所述切换请求消息中携带的源协作小区集信息、 源 切换小区集信息以及终端上报的测量报告中其他小区信息确定需要测量的小 区及测量内容， 将所述需要测量的小区及测量内容通过切换响应消息发送给 源主小区， 由所述源主小区通过重配消息发送所述终端； 或者直接将所述需 要测量的小区及测量内容发送给所述终端；
所述目标主小区接收所述终端切换到所述目标主小区后上报的信道状况 测量结果， 根据所述信道状况测量结果选取目标协作小区集和目标切换小区 集。 本发明的方法还可具有以下特点， 选取目标协作小区集时， 还可参考待 选小区与所述目标主小区的连接关系， 选取目标切换小区集时， 还可参考待 选小区与所述目标协作小区集中的小区的连接关系。 本发明的方法还可具有以下特点， 所述方法还可包括： 所述目标主小区 还通过源主小区将所述确定最终的目标协作小区集和目标切换小区集的信息 发送给所述终端； 或者， 直接将所述确定最终的目标协作小区集和目标切换 小区集的信息发送给所述终端。 本发明还提供一种基于多点协作的切换系统， 包括源主小区和目标主小 区， 其中：
所述源主小区设置为， 收到终端上报的测量报告后， 确定目标主小区， 向所述目标主小区发送切换请求消息；
所述目标主小区设置为， 在接收到所述切换请求消息后， 为所述终端分 配资源， 在所述终端切换到所述目标主小区前或者在所述终端切换到所述目 标主小区后， 确定最终的目标协作小区集和目标切换小区集。 本发明的系统还可具有以下特点， 所述源主小区可包括目标主小区确定 单元：
所述目标主小区确定单元设置为： 在所述测量报告中携带的小区中优先 级最高的一类小区中选取一个小区作为所述目标主小区， 其中， 优先级原则 为：
源切换小区集中的小区的优先级 >其他小区的优先级， 且与源主小区属 于同一个演进节点 B ( eNodeB ) 的小区的优先级>小区所在 eNodeB与源主 小区所在 eNodeB存在 X2口连接的小区的优先级>其他小区的优先级。 本发明的系统还可具有以下特点， 所述目标主小区确定单元还设置为： 若所述测量 ^艮告中携带的小区中优先级最高的一类小区属于源切换小区集， 则从中选取负荷最低的小区作为所述目标主小区； 若所述测量报告中携带的 小区中优先级最高的一类小区不属于源切换小区集， 则从中随机选取一个小 区作为所述目标主小区。 本发明的系统还可具有以下特点， 所述目标主小区可包括选取单元： 所述选取单元设置为： 选取目标协作小区集， 向选取的目标协作小区集 中的每个目标协作小区发送协作小区请求消息， 接收到所述目标协作小区的 拒绝消息时， 将发送所述拒绝消息的目标协作小区从所述目标协作小区集中 删除， 得到最终的目标协作小区集； 以及，
选取目标切换小区集， 向目标切换小区集中的每个目标切换小区发送切 换小区请求消息， 接收到所述目标切换小区的拒绝消息时， 将发送所述拒绝 消息的目标切换小区从所述目标切换小区集中删除， 得到最终的目标切换小 区集。 本发明的系统还可具有以下特点， 所述选取单元还设置为根据所述切换 请求消息中携带的源协作 d、区集信息、 源切换 d、区集信息以及终端上 >¾的测 量报告中其他小区信息选取目标协作小区集和目标切换小区集。 本发明的系统还可具有以下特点， 所述目标主小区还可包括测量触发单 元， 其中： 所述测量触发单元设置为： 根据所述切换请求消息中携带的源协作小区 集信息、 源切换小区集信息以及终端上报的测量报告中其他小区信息确定需 要测量的小区及测量内容， 将所述需要测量的小区及测量内容通过切换响应 信息发送给源主小区， 由源主小区通过重配消息发送所述终端； 或者直接将 需要测量的小区及测量内容发送给所述终端；
所述选取单元还设置为接收所述终端切换到所述目标主小区后上报的信 道状况测量结果， 根据所述信道状况测量结果选取目标协作小区集和目标切 换小区集。 本发明的系统还可具有以下特点， 所述选取单元还设置为选取目标协作 小区集时，参考待选小区与目标主小区的连接关系，选取目标切换小区集时， 参考待选小区与目标协作小区集中的小区的连接关系。 本发明的系统还可具有以下特点， 所述目标主小区还设置为： 通过源主 小区将所述确定最终的目标协作小区集和目标切换小区集的信息发送给所述 终端； 或者， 直接将所述确定最终的目标协作小区集和目标切换小区集的信 息发送给所述终端。 本发明实施方式提供了一种当 UE的目标小区不属于原来的 CoMP协作 小区集时的完整的切换流程， 可涉及切换时每一步操作的相关参数， 可涉及 目标主小区的选取方法， 可涉及切换中和切换后通过直接选取或 UE上 ^艮测 量方式选取 CoMP小区集和切换小区集的方法， 可涉及目标小区选取 CoMP 协作小区时的流程。 釆用本发明实施方式的方法， 即使 UE在切换时， 也有 源辅小区 /主小区继续为 UE传输数据， 这样可减少切换中断时延， 提高切换 时的系统吞吐量， 且切换中或切换后为 UE重新选择 CoMP小区集和切换小 区集， 使得 UE在切换后可以获得相同的服务。
附图概述 图 1是本发明实施例的切换总体流程图；
图 2是协作小区集与切换小区集示意图； 图 3是本发明实施例的目标主小区 （属于源切换小区集）选取示意图； 图 4是本发明实施例的目标主小区 （属于其他小区）选取示意图； 图 5是本发明实施例的切换中直接选取目标侧小区集的切换流程； 图 6是本发明实施例的切换中通过测量选取目标侧小区集的切换流程； 图 7是本发明实施例的切换后直接选取目标侧小区集的切换流程； 图 8是本发明实施例的切换后通过测量选取目标侧小区集的切换流程； 图 9是本发明实施例的切换后各小区集（目标主小区属于源切换小区集） 示意图；
图 10是本发明实施例的切换后各小区集（目标主小区属于其他小区）示 意图。
本发明的较佳实施方式
UE在切换之前的关于以上小区或小区集的选取不属于本发明范围， 相 应地， 这些概念可具体为： 源协作小区集、 源主小区、 源辅小区、 源切换小 区集。
UE执行切换时主小区、 辅小区、 协作小区集以及切换小区集的选取属 于本发明范围， 相应地， 这些概念可具体为： 目标协作小区集、 目标主小区、 目标辅小区、 目标切换小区集。 本发明实施方式提供一种基于多点协作的切换方法， 包括：
源主小区收到终端上报的测量报告后， 确定目标主小区， 向所述目标主 小区发送切换请求消息；
所述目标主小区在接收到所述切换请求消息后， 为所述终端分配资源， 在所述终端切换到所述目标主小区前或者在所述终端切换到所述目标主小区 后， 确定目标协作小区集和目标切换小区集。
下面具体描述本发明的实施方式， 整体的切换流程见附图 1 :
1、 切换流程的触发 触发方式与现有方法类似， 釆用 UE上报测量报告形式， 测量及上报内 容， 可选择 RSRP/RSRQ/SINR ( Signal to Interference plus Noise Ratio, 信千 噪比）中的任意组合， 上报条件： 当主小区的 RSRP/RSRQ/SINR下降到一定 门限值以下， 且 /或其他小区 （协作小区集外的小区） 的 RSRP/RSRQ/SINR 上升到一定门限值以上并持续一定时间。
2、 目标主小区的选取 源主小区收到 UE发送的测量报告， 测量报告中携带 RSRP/RSRQ/SINR 满足切换门限的一个或多个小区的信息。
所述源主小区确定目标主小区： 所述源小区从所述测量报告中携带的小 区中优先级最高的一类小区中选择一个小区作为目标主小区， 其中， 优先级 原则为：
源切换小区集中的小区的优先级 >其他小区的优先级， 且与源主小区属 于同一个演进节点 B ( eNodeB ) 的小区的优先级>小区所在 eNodeB与源主 小区所在 eNodeB存在 X2口连接的小区的优先级>其他小区的优先级。
选取步骤包括：
首先， 源主小区按照 "源切换小区集中的小区〉其他小区" 的优先级原 则， 对测量 4艮告中的小区进行筛选或分类排序。
然后， 源主小区按照 "与源主小区属于同一个 eNodeB ( Evolved Node B , 演进节点 Β ) 的小区>小区所在 eNodeB与源主小区所在 eNodeB存在 X2口 连接 >其他小区" 的优先级原则， 对上一阶段 选出来的小区再次进行筛选 或分类排序， 或者对上一阶段分类排序后的小区在各类中再次进行 选或分 类排序。
最后， 若 选出来的小区或者分类排序后优先级最高的一类小区属于源 切换小区集， 则从中选取负荷最低的小区作为目标主小区， 也可随机选择； 若不属于源切换小区集， 则从中随机选取一个小区作为目标主小区。
3、 切换的执行
确定目标主小区后， 源主小区向目标主小区发送切换请求消息， 消息中 包括但不限于以下信息： UE的业务承载信息、 切换类型、 切换原因、 UE的 安全信息、 UE 的无线接入能力信息、 接入层配置和无线资源配置。 可选择 地， 携带源协作小区集信息、 源切换小区集信息以及测量 ^艮告中其他小区的 信息。
目标主小区收到切换请求消息后， 为即将切换过来的 UE分配资源。 可 选择地， 目标主小区根据请求消息中的相关信息确定目标协作小区集和目标 切换小区集， 或者确定（选取小区集所需）需要 UE测量的小区和测量内容。 是否会选择这一步骤以及选择后具体执行哪一操作， 取决于目标协作小区集 和目标切换小区集的选取时机和选取方式。 目标主小区发送切换响应消息给源主小区。 消息中包括但不限于以下信 息： 接纳成功与接纳失败的 UE业务承载信息、 新的测量配置、 目标主小区 为 UE分配的 C-RNTI ( Cell- Radio Network Temporary Identifier, 小区相关的 无线网络临时标识） 、 随机接入信道资源信息、 以及安全相关配置。 可选择 地， 携带目标主小区为 UE选取的目标协作小区集和目标切换小区集信息， 或者需要 UE测量的小区和测量内容。 源主小区收到切换响应消息后， 下发重配消息给 UE, 消息中包括但不 限于以下信息： 目标主小区已建立的 DRB ( Data Radio Bearer , 数据无线承 载）和 SRB ( Signal Radio Bearer, 信令无线承载）信息、 新的测量配置、 目 标主小区为 UE分配的 C-RNTI、随机接入信道资源信息、以及安全相关配置。 可选择地， 携带目标主小区为 UE选取的目标协作小区集和目标切换小区集 信息， 或者需要 UE测量的小区和测量内容。
UE收到重配消息后， 将本地的 DRB信息与重配消息中的 DRB信息比 较，释放多余的 DRB。然后同步到目标主小区并向目标主小区发起随机接入， 随机接入成功后， UE发送重配完成消息到目标主小区。 若源主小区下发给 UE的重配消息中携带了目标主小区为 UE选取的目 标协作小区集信息， 则 UE切换成功后， 将以此目标协作小区集来传输数据。 若源主小区下发给 UE的重配消息中携带了 UE测量的小区和测量内容， 则 UE切换成功后， 执行测量并将信道状态测量结果上报给目标主小区。 目标 主小区开始进行目标协作小区集和目标切换小区集的选取。 若目标主小区收到源主小区发送的切换请求消息后， 为 UE分配资源失 败，则回应切换准备失败消息给源主小区， 源主小区将重新选择目标主小区， 然后重新执行切换。
4、 目标协作小区集和目标切换小区集的选取
目标协作小区集和目标切换小区集由目标主小区来选取， 可选择地， 目 标主小区在收到切换请求消息后，执行目标小区集和目标切换小区集的选取， 或者在收到 UE的重配完成消息后， 执行目标小区集和目标切换小区集的选 取。 目标切换小区集的选取在目标协作小区集的选取之后执行。
选取方式可选择以下两种方式之一：
方式 1 : 目标主小区根据切换请求消息中的源协作小区集信息、 源切换 小区集信息以及测量报告中其他小区的信息， 综合考虑小区的信号强度、 负 荷、 路损等信息直接进行目标协作小区集和目标切换小区集的选取。 此外， 目标协作小区集的选取还需考虑该小区与目标主小区连接关系 （与目标主小 区属于同一个 eNodeB >小区所在 eNodeB与目标主小区所在 eNodeB存在 X2 口连接〉其他小区） ， 而目标切换小区集的选取需要考虑该小区与目标协作 集中小区的连接关系。 方式 2: 目标主小区参考切换请求消息中的源协作小区集信息、 源切换 小区集信息以及测量报告中其他小区的信息， 然后通过 UE实时上报测量信 息的方式进行目标协作小区集和目标切换小区集的选取。 具体是指， 目标主 小区要求 UE 对指定小区的信道状况进行测量， 测量内容包括但不限于 RSRP、 RSRQ、 SINR、 CQI、 路损等。 UE 上报信道状况测量结果后， 目标 主小区综合考虑各小区的信道状况以及负荷等信息， 确定目标协作小区集和 目标切换小区集。 同样地， 目标协作小区集的选取还需考虑该小区与目标主 小区连接关系， 而目标切换小区集的选取需要考虑该小区与目标协作集中小 区的连接关系。
确定目标协作小区集后， 目标主小区向目标协作小区集中的小区发送协 作小区请求消息， 消息中包括但不限于以下信息： 所要服务的 UE的全部资 源配置信息、 小区需要实时反馈的信息类型 （如： 无线资源使用状况、 有线 资源使用状况） 、 反馈的类型 （实时反馈、 周期性反馈） 、 反馈门限（实时 反馈时可选择） 、 反馈周期 （周期性反馈） 。
目标协作小区收到协作小区请求消息后， 确定是否愿意作为辅小区， 若 愿意， 则按照 UE的信息进行资源分配并回应协作接受消息， 之后按照反馈 要求进行信息反馈。
若目标协作小区由于某些原因回应拒绝消息， 则目标主小区从协作小区 集中删除该小区。
可选择地， 目标主小区通知 UE协作小区集发生变化。 确定最终的目标协作小区集后， 目标主小区向目标切换小区集中的小区 发送切换小区请求消息， 消息中包括但不限于以下信息： 请求反馈的信息类 型 (如： 无线资源使用状况、 有线资源使用状况）、 反馈的类型（实时反馈、 周期性反馈）、 反馈门限 (实时反馈时可选择）、 反馈周期（周期性反馈）。
目标切换小区收到切换小区请求消息后回应切换小区接受消息， 之后按 照反馈要求进行信息反馈。
若对端小区由于某些原因回应拒绝响消息， 则目标主小区从切换小区集 中删除该小区。
可选择地， 目标主小区通知 UE切换小区集发生变化。
下面结合附图和实施例对本发明的一些实施方式进行详细说明。
首先介绍几个概念： 协作 （传输） 小区集， 主小区、 辅 （助） 小区， 切 换小区集， 如附图 2所示：
协作小区集： CoMP协作集， 用于给同一个 UE服务的小区集合， 如附 图 2中的小区 1、 2、 3。
主小区： 协作小区集中的小区， 执行协作小区集中所有小区资源的统一 调度， 且与 UE存在信令交互， 如附图 2中的小区 1。
辅小区： 协作小区集中的小区， 协助主小区为 UE服务， 如附图 2中的 小区 2、 3。 切换小区集： 该集合中的小区满足但不限于以下条件： 属于协作小区集 中各小区的邻区， 其信号强度要高于预设的第一门限， 小区负荷要低于预设 的第二门限（可选择地， 第二门限根据 UE的资源使用情况实时地或周期性 地变化， 相应地切换小区集也实时地或周期性地变化） 。 主小区拥有这些小 区的负荷信息。 切换小区集可由 UE、 主小区、 辅小区共同决定。 如附图 2 中的小区 5、 6、 7、 8、 10、 12。 而附图 2中小区 9、 11、 14分别由于信号强 度不够、 负荷较重或其他原因 （如， 切换小区集个数限制）无法归属切换小 区集。
实施例 1: 目标主小区的选取
如附图 3所示， 源主小区收到 UE发送的测量报告， 报告中携带的小区 有： 小区 5、 小区 6、 小区 7和小区 16。 由于小区 5、 6、 7属于源切换小区 集， 因此优先被作为目标主小区的候选小区。 又由于小区 6、 7与源主小区 1 属于同一个 eNodeB, 因此将从小区 6和小区 7中选择一个负荷较小的作为 目标主小区。
实施例 2: 目标主小区的选取
如附图 4所示， 源主小区收到 UE发送的测量报告， 报告中携带的小区 有： 小区 4、 小区 13、 和小区 14 , 这三个小区均属于其他小区。 由于只有小 区 4与源主小区 1属于同一个 eNodeB, 因此被优先选择为目标主小区。
实施例 3: 切换中直接选取目标侧小区集的切换方式
如附图 5所示， 源主小区选取目标主小区后， 向目标主小区发送切换请 求消息， 消息中包括但不限于以下信息： UE 的业务承载信息、 切换类型、 切换原因、 UE的安全信息、 UE的无线接入能力信息、 接入层配置和无线资 源配置、 源协作小区集信息、 源切换小区集信息以及测量 ^艮告中其他小区的 信息。 目标主小区收到切换请求消息后， 为即将切换过来的 UE分配资源， 并 根据切换请求消息中的源协作小区集信息、 源切换 d、区集信息以及测量 ^艮告 中其他小区的信息， 综合考虑这些小区的信号强度、 负荷、 路损以及与目标 主小区连接关系选取目标协作小区集， 然后考虑这些小区与目标协作集中小 区的连接关系选取目标切换小区集。
目标主小区向目标协作小区集中的小区发送协作小区请求消息， 消息中 包括但不限于以下信息： 所要服务的 UE的全部资源配置信息、 小区需要实 时反馈的信息类型 (如： 无线资源使用状况、 有线资源使用状况） 、 反馈的 类型 （实时反馈、 周期性反馈） 、 反馈门限（实时反馈时可选择） 、 反馈周 期 （周期性反馈） 。
目标协作小区收到协作小区请求消息后， 确定是否愿意作为辅小区， 若 愿意， 则按照 UE的信息进行资源分配并回应协作小区接受消息， 之后按照 反馈要求进行信息反馈。
确定最终的目标协作小区集后，再对目标切换小区集中的小区进行筛选， 然后目标主小区向目标切换小区集中的小区发送切换小区请求消息， 消息中 包括但不限于以下信息： 请求反馈的信息类型 （如： 无线资源使用状况、 有 线资源使用状况） 、 反馈的类型 （实时反馈、 周期性反馈） 、 反馈门限（实 时反馈时可选择） 、 反馈周期 （周期性反馈） 。
目标切换小区收到切换小区请求消息后回应切换小区接受消息， 之后按 照反馈要求进行信息反馈。
目标主小区发送切换响应消息给源主小区。 消息中包括但不限于以下信 息： 接纳成功与接纳失败的 UE业务承载信息、 新的测量配置、 目标主小区 为 UE分配的 C-RNTI ( Cell- Radio Network Temporary Identifier, 小区相关的 无线网络临时标识） 、 随机接入信道资源信息、 以及安全相关配置、 并携带 目标主小区为 UE选取的目标协作小区集和目标切换小区集信息。
源主小区收到切换响应消息后， 下发重配消息给 UE, 消息中包括但不 限于以下信息： 目标主小区已建立的 DRB ( Data Radio Bearer , 数据无线承 载）和 SRB ( Signal Radio Bearer, 信令无线承载）信息、 新的测量配置、 目 标主小区为 UE分配的 C-RNTI、随机接入信道资源信息、以及安全相关配置， 并携带目标主小区为 UE选取的目标协作小区集和目标切换小区集信息。
UE收到重配消息后， 将本地的 DRB信息与重配消息中的 DRB信息比 较，释放多余的 DRB。然后同步到目标主小区并向目标主小区发起随机接入， 随机接入成功后， UE发送重配完成消息到目标主小区。至此， UE切换成功， 并以最新的协作小区集进行数据的传输。
实施例 4: 切换中通过测量选取目标侧小区集的切换方式
如附图 6所示， 源主小区选取目标主小区后， 向目标主小区发送切换请 求消息， 消息中包括但不限于以下信息： UE 的业务承载信息、 切换类型、 切换原因、 UE的安全信息、 UE的无线接入能力信息、 接入层配置和无线资 源配置、 源协作小区集信息、 源切换小区集信息以及测量 ^艮告中其他小区的 信息。
目标主小区收到切换请求消息后， 为即将切换过来的 UE分配资源， 并 根据切换请求消息中的源协作小区集信息、 源切换 d、区集信息以及测量 ^艮告 中其他小区的信息， 确定需要 UE测量的小区和测量内容。
目标主小区发送切换响应消息给源主小区。 消息中包括但不限于以下信 息： 接纳成功与接纳失败的 UE业务承载信息、 新的测量配置、 目标主小区 为 UE分配的 C-RNTI ( Cell- Radio Network Temporary Identifier, 小区相关的 无线网络临时标识） 、 随机接入信道资源信息、 以及安全相关配置， 并携带 需要 UE测量的小区和测量内容。
源主小区收到切换响应消息后， 下发重配消息给 UE, 消息中包括但不 限于以下信息： 目标主小区已建立的 DRB ( Data Radio Bearer , 数据无线承 载）和 SRB ( Signal Radio Bearer, 信令无线承载）信息、 新的测量配置、 目 标主小区为 UE分配的 C-RNTI、随机接入信道资源信息、以及安全相关配置， 并携带需要 UE测量的小区和测量内容。
UE收到重配消息后， 将本地的 DRB信息与重配消息中的 DRB信息比 较，释放多余的 DRB。然后同步到目标主小区并向目标主小区发起随机接入， 随机接入成功后 , UE发送重配完成消息到目标主小区。至此， UE切换成功 , 但此时还只能和目标主小区进行数据的传输。
UE执行测量并将信道状态测量结果上报给目标主小区。 目标主小区根 据上报的测量结果， 综合考虑这些小区的信号强度、 负荷、 路损以及与目标 主小区连接关系选取目标协作小区集， 然后考虑这些小区与目标协作集中小 区的连接关系选取目标切换小区集。
目标主小区向目标协作小区集中的小区发送协作小区集请求消息， 消息 中包括但不限于以下信息： 所要月良务的 UE的全部资源配置信息、 小区需要 实时反馈的信息类型 （如： 无线资源使用状况、 有线资源使用状况） 、 反馈 的类型 （实时反馈、 周期性反馈） 、 反馈门限（实时反馈时可选择） 、 反馈 周期 （周期性反馈） 。 目标协作小区收到协作请求消息后， 确定是否愿意作 为辅小区， 若愿意， 则按照 UE的信息进行资源分配并回应协作接受消息， 之后按照反馈要求进行信息反馈。 目标主小区通过重配消息通知 UE协作小 区集发生变化， UE返回重配完成消息给目标主小区。 至此， UE以最新的协 作小区集进行数据的传输。
确定最终的目标协作小区集后，再对目标切换小区集中的小区进行筛选， 然后目标主小区向目标切换小区集中的小区发送切换小区请求消息， 消息中 包括但不限于以下信息： 请求反馈的信息类型 （如： 无线资源使用状况、 有 线资源使用状况） 、 反馈的类型 （实时反馈、 周期性反馈） 、 反馈门限（实 时反馈时可选择 ) 、 反馈周期 (周期性反馈 ) 。 目标切换小区收到切换小区 请求消息后回应切换小区接受消息， 之后按照反馈要求进行信息反馈。 目标 主小区通过重配消息通知 UE切换小区集发生变化。 UE返回重配完成消息给 目标主小区。
实施例 5: 切换后直接选取目标侧小区集的切换方式
如附图 7所示， 源主小区选取目标主小区后， 向目标主小区发送切换请 求消息， 消息中包括但不限于以下信息： UE 的业务承载信息、 切换类型、 切换原因、 UE的安全信息、 UE的无线接入能力信息、 接入层配置和无线资 源配置、 源协作小区集信息、 源切换小区集信息以及测量 ^艮告中其他小区的 信息。
目标主小区收到切换请求消息后， 为即将切换过来的 UE分配资源。 然 后发送切换响应消息给源主小区。 消息中包括但不限于以下信息： 接纳成功 与接纳失败的 UE业务承载信息、 新的测量配置、 目标主小区为 UE分配的 C-RNTI ( Cell- Radio Network Temporary Identifier , 小区相关的无线网络临时 标识） 、 随机接入信道资源信息、 以及安全相关配置。
源主小区收到切换响应消息后， 下发重配消息给 UE, 消息中包括但不 限于以下信息： 目标主小区已建立的 DRB ( Data Radio Bearer , 数据无线承 载）和 SRB ( Signal Radio Bearer, 信令无线承载）信息、 新的测量配置、 目 标主小区为 UE分配的 C-RNTI、随机接入信道资源信息、以及安全相关配置。
UE收到重配消息后， 将本地的 DRB信息与重配消息中的 DRB信息比 较，释放多余的 DRB。然后同步到目标主小区并向目标主小区发起随机接入， 随机接入成功后， UE发送重配完成消息到目标主小区。至此， UE切换成功， 但此时还只能和目标主小区进行数据的传输。
此时， 主小区根据之前切换请求消息中的源协作小区集信息、 源切换小 区集信息以及测量 ^艮告中其他小区的信息， 综合考虑这些小区的信号强度、 负荷、 路损以及与目标主小区连接关系选取目标协作小区集， 然后考虑这些 小区与目标协作集中小区的连接关系选取目标切换小区集。
目标主小区向目标协作小区集中的小区发送协作小区集请求消息， 消息 中包括但不限于以下信息： 所要月良务的 UE的全部资源配置信息、 小区需要 实时反馈的信息类型 （如： 无线资源使用状况、 有线资源使用状况） 、 反馈 的类型 （实时反馈、 周期性反馈） 、 反馈门限（实时反馈时可选择） 、 反馈 周期 （周期性反馈） 。
目标协作小区收到协作请求消息后，确定是否愿意作为辅小区，若愿意， 则按照 UE的信息进行资源分配并回应协作接受消息， 之后按照反馈要求进 行信息反馈。 目标主小区通知 UE协作小区集发生变化。 至此， UE以最新的 协作小区集进行数据的传输。 确定最终的目标协作小区集后，再对目标切换小区集中的小区进行筛选， 然后目标主小区向目标切换小区集中的小区发送切换小区请求消息， 消息中 包括但不限于以下信息： 请求反馈的信息类型 （如： 无线资源使用状况、 有 线资源使用状况） 、 反馈的类型 （实时反馈、 周期性反馈） 、 反馈门限（实 时反馈时可选择） 、 反馈周期 （周期性反馈） 。
目标切换小区收到切换小区请求消息后回应切换小区接受消息， 之后按 照反馈要求进行信息反馈。 目标主小区通知 UE切换小区集发生变化。
实施例 6: 切换后通过测量选取目标侧小区集的切换方式
如附图 8所示， 源主小区选取目标主小区后， 向目标主小区发送切换请 求消息， 消息中包括但不限于以下信息： UE 的业务承载信息、 切换类型、 切换原因、 UE的安全信息、 UE的无线接入能力信息、 接入层配置和无线资 源配置、 源协作小区集信息、 源切换小区集信息以及测量 ^艮告中其他小区的 信息。
目标主小区收到切换请求消息后， 为即将切换过来的 UE分配资源。 然 后发送切换响应消息给源主小区。 消息中包括但不限于以下信息： 接纳成功 与接纳失败的 UE业务承载信息、 新的测量配置、 目标主小区为 UE分配的 C-RNTI ( Cell- Radio Network Temporary Identifier , 小区相关的无线网络临时 标识） 、 随机接入信道资源信息、 以及安全相关配置。
源主小区收到切换响应消息后， 下发重配消息给 UE, 消息中包括但不 限于以下信息： 目标主小区已建立的 DRB ( Data Radio Bearer , 数据无线承 载）和 SRB ( Signal Radio Bearer, 信令无线承载）信息、 新的测量配置、 目 标主小区为 UE分配的 C-RNTI、随机接入信道资源信息、以及安全相关配置。
UE收到重配消息后， 将本地的 DRB信息与重配消息中的 DRB信息比 较，释放多余的 DRB。然后同步到目标主小区并向目标主小区发起随机接入， 随机接入成功后， UE发送重配完成消息到目标主小区。至此， UE切换成功， 但此时还只能和目标主小区进行数据的传输。 此时， 目标主小区根据之前切换请求消息中的源协作小区集信息、 源切 换小区集信息以及测量报告中其他小区的信息， 确定需要 UE测量的小区和 测量内容。 然后下发重配消息给 UE,要求 UE对指定小区的信道状况进行测 量， 测量内容包括但不限于 RSRP、 RSRQ、 SINR、 CQI、 路损等。 UE收到 重配消息后， 执行测量并将信道状态测量结果上报给目标主小区。 目标主小 区根据上报的测量结果， 综合考虑这些小区的信号强度、 负荷、 路损以及与 目标主小区连接关系选取目标协作小区集， 然后考虑这些小区与目标协作集 中小区的连接关系选取目标切换小区集。 目标主小区向目标协作小区集中的小区发送协作小区集请求消息， 消息 中包括但不限于以下信息： 所要月良务的 UE的全部资源配置信息、 小区需要 实时反馈的信息类型 （如： 无线资源使用状况、 有线资源使用状况） 、 反馈 的类型 （实时反馈、 周期性反馈） 、 反馈门限（实时反馈时可选择） 、 反馈 周期 （周期性反馈） 。 目标协作小区收到协作请求消息后， 确定是否愿意作 为辅小区， 若愿意， 则按照 UE的信息进行资源分配并回应协作接受消息， 之后按照反馈要求进行信息反馈。 目标主小区通知 UE协作小区集发生变化。 至此， UE以最新的协作小区集进行数据的传输。 确定最终的目标协作小区集后，再对目标切换小区集中的小区进行筛选， 然后目标主小区向目标切换小区集中的小区发送切换小区请求消息， 消息中 包括但不限于以下信息： 请求反馈的信息类型 （如： 无线资源使用状况、 有 线资源使用状况） 、 反馈的类型 （实时反馈、 周期性反馈） 、 反馈门限（实 时反馈时可选择 ) 、 反馈周期 (周期性反馈 ) 。 目标切换小区收到切换小区 请求消息后回应切换小区接受消息， 之后按照反馈要求进行信息反馈。 目标 主小区通知 UE切换小区集发生变化。
实施例 7: 目标协作小区与目标切换小区的选取 如附图 9所示， 为目标主小区属于源切换小区集时， 最终选取的目标协 作小区与目标切换小区。 其中小区 6为目标主小区， 小区 1 (源主小区） 、 5 为目标辅小区（源切换小区集中的小区）； 小区 4、 7、 15、 16、 17归属目标 切换小区集。 小区 2、 3、 14虽为目标协作小区集中小区的邻区， 但由于信号 强度不够而无法归属目标切换小区集， 小区 18虽然信号强度条件满足，但负 荷较重， 也无法归属目标切换小区集。
如附图 10所示，为目标主小区属于其他小区时，最终选取的目标协作小 区与目标切换小区。 其中小区 4为目标主小区， 小区 1 (源主小区） 、 3 (源 辅小区）为目标辅小区； 小区 2 (源辅小区）、 5、 12、 14归属目标切换小区 集。 小区 6、 7、 10、 11虽为目标协作小区集中小区的邻区， 但由于信号强度 不够而无法归属切换小区集， 小区 13虽然信号强度条件满足， 但负荷较重， 也无法归属目标切换小区集。 本发明还提供一种基于多点协作的切换系统， 包括源主小区和目标主小 区， 其中：
所述源主小区设置为， 收到终端上报的测量报告后， 确定目标主小区， 向所述目标主小区发送切换请求消息；
所述目标主小区设置为， 在接收到所述切换请求消息后， 为所述终端分 配资源， 在所述终端切换到所述目标主小区前或者在所述终端切换到所述目 标主小区后， 确定目标协作小区集和目标切换小区集。
其中， 所述源主小区包括目标主小区确定单元：
所述目标主小区确定单元设置为： 在所述测量报告中携带的小区中优先 级最高的一类小区中选取一个小区作为所述目标主小区， 其中， 优先级原则 为：
源切换小区集中的小区的优先级 >其他小区的优先级， 且与源主小区属 于同一个演进节点 B ( eNodeB ) 的小区的优先级>小区所在 eNodeB与源主 小区所在 eNodeB存在 X2口连接的小区的优先级>其他小区的优先级。
所述目标主小区确定单元设还置为： 若所述测量报告中携带的小区中优 先级最高的一类小区属于源切换小区集， 则从中选取负荷最低的小区作为所 述目标主小区； 若所述测量报告中携带的小区中优先级最高的一类小区不属 于源切换小区集， 则从中随机选取一个小区作为所述目标主小区。
其中， 所述目标主小区包括选取单元：
所述选取单元设置为： 选取目标协作小区集， 向选取的目标协作小区集 中的每个目标协作小区发送协作小区请求消息， 接收到所述目标协作小区的 拒绝消息时， 将所述目标协作小区从所述目标协作小区集中删除， 得到最终 的目标协作小区集； 以及
选取目标切换小区集， 向目标切换小区集中的每个目标切换小区发送切 换小区请求消息， 接收到所述目标切换小区的拒绝消息时， 将所述目标切换 小区从所述目标切换小区集中删除， 得到最终的目标切换小区集。
所述选取单元还设置为根据所述切换请求消息中携带的源协作小区集信 息、 源切换小区集信息以及终端上报的测量报告中其他小区信息选取目标协 作小区集和目标切换小区集。
所述目标主小区还包括测量触发单元， 其中：
所述测量触发单元设置为： 根据所述切换请求消息中携带的源协作小区 集信息、 源切换小区集信息以及终端上报的测量报告中其他小区信息确定需 要测量的小区及测量内容， 将所述需要测量的小区及测量内容通过切换响应 信息发送给源主小区， 由源主小区通过重配消息发送所述终端； 或者直接将 需要测量的小区及测量内容发送给所述终端；
所述选取单元还设置为接收所述终端切换到所述目标主小区后上报的信 道状况测量结果， 根据所述信道状况测量结果选取目标协作小区集和目标切 换小区集。
其中， 所述选取单元还设置为选取目标协作小区集时， 参考待选小区与 目标主小区的连接关系， 选取目标切换小区集时， 参考待选小区与目标协作 小区集中的小区的连接关系。
其中， 所述目标主小区还设置为： 通过源主小区将所述目标协作小区集 信息和目标切换小区集信息发送给所述终端； 或者， 直接将所述目标协作小 区集信息和目标切换小区集信息发送给所述终端。
工业实用性 本发明提供了一种当 UE的目标小区不属于原来的 CoMP协作小区集时 的完整的切换流程， 发明中涉及切换时每一步操作的相关参数， 涉及目标主 小区的选取方法， 涉及切换中和切换后通过直接选取或 UE上^艮测量方式选 取 CoMP小区集和切换小区集的方法， 涉及目标小区选取 CoMP协作小区时 的流程。 釆用本发明的方法， 即使 UE在切换时， 也有源辅小区 /主小区继续 为 UE传输数据， 这样可减少切换中断时延， 提高切换时的系统吞吐量， 且 切换中或切换后为 UE重新选择 CoMP小区集和切换小区集， 使得 UE在切 换后可以获得相同的服务。

Claims

权 利 要 求 书
1、 一种基于多点协作的切换方法， 其包括： 源主小区收到终端上报的测量报告后， 确定目标主小区， 向所述目标主 小区发送切换请求消息； 所述目标主小区在接收到所述切换请求消息后， 为所述终端分配资源， 在所述终端切换到所述目标主小区前或者在所述终端切换到所述目标主小区 后， 确定最终的目标协作小区集和目标切换小区集。
2、如权利要求 1所述的方法， 其中， 所述源主小区确定目标主小区的步 骤包括： 所述源主小区从所述测量报告中携带的小区中优先级最高的一类小 区中选择一个小区作为目标主小区， 其中， 优先级原则为： 源切换小区集中的小区的优先级 >其他小区的优先级， 且与所述源主小 区属于同一个演进节点 B ( eNodeB ) 的小区的优先级>小区所在 eNodeB与 所述源主小区所在 eNodeB存在 X2口连接的小区的优先级>其他小区的优先 级。
3、如权利要求 2所述的方法， 其中， 所述源主小区从所述测量报告中携 带的小区中优先级最高的一类小区中选择一个 d、区作为目标主小区的步骤包 括： 若所述测量 ^艮告中携带的小区中优先级最高的一类小区属于所述源切换 小区集， 则从中选取负荷最低的小区作为所述目标主小区； 若所述测量报告 中携带的小区中优先级最高的一类小区不属于所述源切换小区集， 则从中随 机选取一个小区作为所述目标主小区。
4、如权利要求 1所述的方法， 其中， 所述目标主小区确定目标协作小区 集和目标切换小区集的步骤包括： 所述目标主小区选取目标协作小区集， 向选取的目标协作小区集中的每 个目标协作小区发送协作小区请求消息， 接收到所述目标协作小区的拒绝消 息时， 将发送所述拒绝消息的目标协作小区从所述目标协作小区集中删除， 得到最终的目标协作小区集；
所述目标主小区选取目标切换小区集， 向选取的目标切换小区集中的每 个目标切换小区发送切换小区请求消息， 接收到所述目标切换小区的拒绝消 息时， 将发送所述拒绝消息的目标切换小区从所述目标切换小区集中删除， 得到最终的目标切换小区集。
5、如权利要求 4所述的方法， 其中， 在所述目标主小区选取目标协作小 区集以及选取目标切换小区集的步骤中：
所述目标主小区根据所述切换请求消息中携带的源协作小区集信息、 源 切换小区集信息以及终端上报的测量报告中其他小区信息， 选取目标协作小 区集以及选取目标切换小区集。
6、如权利要求 4所述的方法， 其中， 在所述目标主小区选取目标协作小 区集以及选取目标切换小区集的步骤中：
所述目标主小区根据所述切换请求消息中携带的源协作小区集信息、 源 切换小区集信息以及终端上报的测量报告中其他小区信息确定需要测量的小 区及测量内容， 将所述需要测量的小区及测量内容通过切换响应消息发送给 所述源主小区， 由所述源主小区通过重配消息发送所述终端； 或者直接将所 述需要测量的小区及测量内容发送给所述终端；
所述目标主小区接收所述终端切换到所述目标主小区后上报的信道状况 测量结果， 根据所述信道状况测量结果选取目标协作小区集以及选取目标切 换小区集。
7、如权利要求 5或 6所述的方法， 其中， 在所述目标主小区选取目标协 作小区集的步骤中， 还参考待选小区与所述目标主小区的连接关系； 在所述 目标主小区选取目标切换小区集的步骤中， 还参考待选小区与所述目标协作 小区集中的小区的连接关系。
8、如权利要求 1至 6任一所述的方法， 其还包括： 所述目标主小区还通 过所述源主小区将所述确定最终的目标协作小区集和目标切换小区集的信息 发送给所述终端； 或者， 直接将所述确定最终的目标协作小区集和目标切换 小区集的信息发送给所述终端。
9、一种基于多点协作的切换系统，其包括源主小区和目标主小区，其中： 所述源主小区设置为， 收到终端上报的测量报告后， 确定目标主小区， 向所述目标主小区发送切换请求消息；
所述目标主小区设置为， 在接收到所述切换请求消息后， 为所述终端分 配资源， 在所述终端切换到所述目标主小区前或者在所述终端切换到所述目 标主小区后， 确定最终的目标协作小区集和目标切换小区集。
10、 如权利要求 9所述的系统， 其中， 所述源主小区包括目标主小区确 定单元：
所述目标主小区确定单元设置为： 在所述测量报告中携带的小区中优先 级最高的一类小区中选取一个小区作为所述目标主小区， 其中， 优先级原则 为：
源切换小区集中的小区的优先级 >其他小区的优先级， 且与所述源主小 区属于同一个演进节点 B ( eNodeB ) 的小区的优先级>小区所在 eNodeB与 所述源主小区所在 eNodeB存在 X2口连接的小区的优先级>其他小区的优先 级。
11、如权利要求 10所述的系统， 其中， 所述目标主小区确定单元是设置 为： 若所述测量 ^艮告中携带的小区中优先级最高的一类小区属于所述源切换 小区集， 则从中选取负荷最低的小区作为所述目标主小区； 若所述测量报告 中携带的小区中优先级最高的一类小区不属于所述源切换小区集， 则从中随 机选取一个小区作为所述目标主小区。
12、 如权利要求 9所述的系统， 其中， 所述目标主小区包括选取单元， 所述选取单元设置为：
选取目标协作小区集， 向选取的目标协作小区集中的每个目标协作小区 发送协作小区请求消息， 接收到所述目标协作小区的拒绝消息时， 将发送所 述拒绝消息的目标协作小区从所述目标协作小区集中删除， 得到最终的目标 协作小区集； 以及 选取目标切换小区集， 向选取的目标切换小区集中的每个目标切换小区 发送切换小区请求消息， 接收到所述目标切换小区的拒绝消息时， 将发送所 述拒绝消息的目标切换小区从所述目标切换小区集中删除， 得到最终的目标 切换小区集。
13、 如权利要求 12所述的系统， 其中，
所述选取单元是设置为根据所述切换请求消息中携带的源协作小区集信 息、 源切换小区集信息以及终端上报的测量报告中其他小区信息选取目标协 作小区集和目标协作小区集。
14、如权利要求 12所述的系统， 其中， 所述目标主小区还包括测量触发 单元，
所述测量触发单元设置为： 根据所述切换请求消息中携带的源协作小区 集信息、 源切换小区集信息以及终端上报的测量报告中其他小区信息确定需 要测量的小区及测量内容， 将所述需要测量的小区及测量内容通过切换响应 信息发送给所述源主小区， 由所述源主小区通过重配消息发送所述终端； 或 者直接将需要测量的小区及测量内容发送给所述终端；
所述选取单元是设置为接收所述终端切换到所述目标主小区后上报的信 道状况测量结果， 根据所述信道状况测量结果选取目标协作小区集和目标切 换小区集。
15、 如权利要求 13或 14所述的系统， 其中， 所述选取单元是设置为选 取目标协作小区集时， 还参考待选小区与所述目标主小区的连接关系， 选取 目标切换小区集时，还参考待选小区与目标协作小区集中的小区的连接关系。
16、如权利要求 9至 14任一所述的系统， 其中， 所述目标主小区还设置 为： 通过所述源主小区将所述确定最终的目标协作小区集和目标切换小区集 的信息发送给所述终端； 或者， 直接将所述确定最终的目标协作小区集和目 标切换小区集的信息发送给所述终端。
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2507829A (en) * 2012-11-13 2014-05-14 Samsung Electronics Co Ltd Mobile terminal handover in a network implementing coordinated multipoint transmission
CN104219717A (zh) * 2013-05-31 2014-12-17 中国移动通信集团公司 一种终端切换的方法、基站及终端切换的系统
US10111150B2 (en) 2013-02-15 2018-10-23 Samsung Electronics Co., Ltd. Mobile terminal handover in an LTE network

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109219098B (zh) * 2012-08-07 2021-09-14 华为技术有限公司 切换处理方法及基站
CN103945470A (zh) * 2013-01-18 2014-07-23 华为技术有限公司 切换方法、源通信节点和目标通信节点
CN104301953A (zh) * 2013-07-16 2015-01-21 电信科学技术研究院 一种小区切换过程中的协作多点传输控制方法及装置
CN104301954A (zh) * 2013-07-17 2015-01-21 中兴通讯股份有限公司 切换方法、装置、基站和系统
CN105991255B (zh) * 2015-01-28 2019-04-23 中国移动通信集团广东有限公司 一种载波聚合的配置方法及装置
JP2019510445A (ja) * 2016-04-01 2019-04-11 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． モビリティ管理方法、装置、及びシステム
WO2020164073A1 (zh) * 2019-02-14 2020-08-20 Oppo广东移动通信有限公司 条件触发的配置方法及相关产品

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101815328A (zh) * 2009-02-24 2010-08-25 上海贝尔股份有限公司 基于UL CoMP信息来缩短越区切换中断时间的方法和设备
CN101873675A (zh) * 2009-04-22 2010-10-27 中兴通讯股份有限公司 一种多点协作传输协作组信息的发送方法及基站
CN101873666A (zh) * 2009-04-27 2010-10-27 大唐移动通信设备有限公司 通知用户终端多小区协同传输信息的方法、系统及装置
CN101932050A (zh) * 2009-06-19 2010-12-29 大唐移动通信设备有限公司 实现用户设备在网络侧节点间切换的方法、系统及装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6233455B1 (en) * 1999-05-03 2001-05-15 Nortel Networks Limited Method for utilizing negative T—COMP to improve handoff reliability

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101815328A (zh) * 2009-02-24 2010-08-25 上海贝尔股份有限公司 基于UL CoMP信息来缩短越区切换中断时间的方法和设备
CN101873675A (zh) * 2009-04-22 2010-10-27 中兴通讯股份有限公司 一种多点协作传输协作组信息的发送方法及基站
CN101873666A (zh) * 2009-04-27 2010-10-27 大唐移动通信设备有限公司 通知用户终端多小区协同传输信息的方法、系统及装置
CN101932050A (zh) * 2009-06-19 2010-12-29 大唐移动通信设备有限公司 实现用户设备在网络侧节点间切换的方法、系统及装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2507829A (en) * 2012-11-13 2014-05-14 Samsung Electronics Co Ltd Mobile terminal handover in a network implementing coordinated multipoint transmission
GB2507829B (en) * 2012-11-13 2015-04-01 Samsung Electronics Co Ltd Mobile terminal handover in an LTE network
US10111150B2 (en) 2013-02-15 2018-10-23 Samsung Electronics Co., Ltd. Mobile terminal handover in an LTE network
CN104219717A (zh) * 2013-05-31 2014-12-17 中国移动通信集团公司 一种终端切换的方法、基站及终端切换的系统
CN104219717B (zh) * 2013-05-31 2018-07-24 中国移动通信集团公司 一种终端切换的方法、基站及终端切换的系统

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