WO2010121429A1 - 服务小区切换指示方法、服务小区切换方法和装置 - Google Patents

服务小区切换指示方法、服务小区切换方法和装置 Download PDF

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Publication number
WO2010121429A1
WO2010121429A1 PCT/CN2009/071429 CN2009071429W WO2010121429A1 WO 2010121429 A1 WO2010121429 A1 WO 2010121429A1 CN 2009071429 W CN2009071429 W CN 2009071429W WO 2010121429 A1 WO2010121429 A1 WO 2010121429A1
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WIPO (PCT)
Prior art keywords
serving cell
cell
user equipment
information
target serving
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Application number
PCT/CN2009/071429
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English (en)
French (fr)
Inventor
宋巍巍
赵亚军
于映辉
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN200980125177.1A priority Critical patent/CN102100104B/zh
Priority to PCT/CN2009/071429 priority patent/WO2010121429A1/zh
Publication of WO2010121429A1 publication Critical patent/WO2010121429A1/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
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a serving cell handover indication method, a serving cell handover method, and a device. Background technique
  • CoMP Coordinated Multi-Point
  • the downlink coordinated multi-point transmission means that a plurality of geographically dispersed transmission points jointly send data to the user equipment (User Equipment; hereinafter referred to as UE), and the uplink multi-point coordinated reception refers to multiple geographically dispersed receiving points jointly receiving the UE. Data and joint processing.
  • a network node includes a base station (eNodeB) and some access points such as a cell, a transmission and reception point, a radio frequency unit (RRU), and an access node (Access Point; hereinafter referred to as an AP) And so on, where "AP" is a node including at least a radio frequency transceiver, and a single antenna element or a plurality of antenna elements can be configured on the AP.
  • a plurality of APs are geographically dispersed and connected to the base station.
  • multiple APs can jointly transmit and receive UE data. These cooperative APs can come from the same base station or from different base stations.
  • the relationship between the AP and the cell in the traditional sense may be that one cell includes one AP, or one cell includes multiple APs.
  • the following uses a cell to include an AP as an example.
  • the UE selects an AP as a serving cell (PDCCH cell) to transmit some control information, for example, a physical downlink control channel (Physical Downlink Control Channel; The PDCCH) transmits the control information, and the other APs only provide the service information.
  • the service information can be transmitted only through the Physical Downlink Shared Channel (hereinafter referred to as PDSCH), and the control information is not transmitted.
  • PDSCH Physical Downlink Shared Channel
  • the existing cell handover procedure is a radio resource control (Radio Resource Control; hereinafter referred to as RRC) signaling interaction process, involving air interface, X2 (interface between base stations),
  • RRC Radio Resource Control
  • X2 interface between base stations
  • the multiple handshake process on the interface of the S1 causes the delay of the high-level signaling handshake process to be long, and cannot quickly notify the UE of the serving cell handover.
  • the embodiment of the present invention provides a serving cell handover indication method, a serving cell handover method, and a device, which are used to solve the defect that the UE cannot be quickly notified of the serving cell handover in the prior art, so that the result of the serving cell selection can be quickly and accurately notified to the UE. , to achieve fast service cell switching.
  • An embodiment of the present invention provides a serving cell handover indication method, including:
  • An embodiment of the present invention provides a serving cell handover indication method, including:
  • the device Generating a handover indication message for instructing the user equipment to switch from the source serving cell to the target serving cell, where the handover indication message includes an index or a cell identifier of the target serving cell; and the user is controlled by the physical layer control channel
  • the device sends the handover indication message.
  • An embodiment of the present invention provides a serving cell handover method, including:
  • media access control sublayer control packet data unit information used to indicate that the user equipment switches from the source serving cell to the target serving cell, where the medium access control sublayer control packet data unit information includes the target serving cell Index or cell identity;
  • Control information is received by a target serving cell corresponding to the index or cell identity.
  • An embodiment of the present invention provides a serving cell handover method, including:
  • a handover indication message which is sent by the network layer, by the physical layer control channel, to indicate that the user equipment is handed over from the source serving cell to the target serving cell, where the handover indication message includes an index or a cell identifier of the target serving cell;
  • Control information is received by a target serving cell corresponding to the index or cell identity.
  • An embodiment of the present invention provides a base station, including:
  • a first determining module configured to determine a target serving cell that is used to send control information to the user equipment, where the first generating module is configured to generate media access for instructing the user equipment to switch from the source serving cell to the target serving cell
  • the control sub-layer controls packet data unit information, where the medium access control sub-layer control packet data unit information includes an index or a cell identifier of the target serving cell, and a first sending module, configured to send the media access to the user equipment
  • the control sublayer controls packet data unit information.
  • An embodiment of the present invention provides a base station, including:
  • a second determining module configured to determine a target serving cell that is used to send control information to the user equipment, and a second generating module, configured to generate a handover indication, used to indicate that the user equipment is handed over from the source serving cell to the target serving cell a message, the handover indication message includes an index or a cell identifier of the target serving cell;
  • a second sending module configured to send the handover indication message to the user equipment by using a physical layer control channel.
  • An embodiment of the present invention provides a user equipment, including:
  • a first acquiring module configured to acquire media access control sublayer control packet data unit information that is sent by the network side to indicate that the user equipment switches from the source serving cell to the target serving cell, where the medium access control sublayer controls packet data unit information. Include an index or a cell identifier of the target serving cell;
  • the first receiving module is configured to receive control information by using a target serving cell corresponding to the index or the cell identifier.
  • An embodiment of the present invention provides a user equipment, including:
  • a second acquiring module configured to acquire, by using a physical layer control channel, a handover indication message, where the user equipment is to be handed over from the source serving cell to the target serving cell, where the handover indication message includes the target service
  • the index or cell identifier of the cell
  • a second receiving module configured to receive control information by using a target serving cell corresponding to the index or the cell identifier.
  • the embodiment of the invention provides a network system, including:
  • a base station configured to determine a target serving cell that is used to send control information for the user equipment, and send, to the user equipment, a medium access control that is used to indicate that the user equipment is handed over from a source serving cell to the target serving cell.
  • the sub-layer controls packet data unit information, where the medium access control sub-layer control packet data unit information includes an index or a cell identifier of the target serving cell;
  • a user equipment configured to acquire information about the media access control sublayer control packet data unit sent by the base station, and receive control information by using a target serving cell corresponding to the index or the cell identifier.
  • the embodiment of the invention provides a network system, including:
  • a base station configured to determine a target serving cell that is used to send control information to the user equipment, and send, by using a physical layer control channel, the user equipment, to indicate that the user equipment is handed over from the source serving cell to the target serving cell.
  • a handover indication message where the handover indication message includes an index or a cell identifier of the target serving cell;
  • the user equipment is configured to acquire the handover indication message sent by the base station, and receive control information by using a target serving cell corresponding to the index or the cell identifier.
  • DRAWINGS 1 is a flowchart of Embodiment 1 of a method for switching a serving cell according to the present invention
  • Embodiment 1 is a flowchart of Embodiment 1 of a method for switching a serving cell according to the present invention
  • Embodiment 3 is a flowchart of Embodiment 2 of a method for handover indication of a serving cell according to the present invention
  • Embodiment 4 is a flowchart of Embodiment 2 of a method for switching a serving cell according to the present invention
  • Embodiment 1 of a base station according to the present invention is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • Embodiment 1 of a user equipment is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • Embodiment 7 is a schematic structural diagram of Embodiment 1 of a network system according to the present invention.
  • Embodiment 8 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.
  • Embodiment 9 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention.
  • FIG. 10 is a schematic structural diagram of Embodiment 2 of a network system according to the present invention. detailed description
  • a candidate cell set (candida te CoMP set, CoMP repor ing set) that can currently serve the UE is defined in the CoMP, and the UE will report related information such as channel quality of the cell in the set.
  • the scheduler sends control information and service information for the UE to dynamically select an appropriate cell.
  • the choice of serving cell can be dynamic.
  • the network side selects the cell with the best signal quality according to the reported channel quality to send control information to ensure that the control information is correctly received.
  • the target serving cell needs to be notified to the UE quickly and accurately, so that it can obtain better control information service.
  • the choice of serving cell can be semi-static. At this time, the quality of the control information signal of the source serving cell will change rapidly, and the network side also needs to quickly and accurately notify the target serving cell to the UE, so that it can obtain better control information service.
  • the base station dynamically selecting the serving cell for the control information provided by the UE in the range of multiple cells in which the UE is located has become an important issue for improving the quality of service.
  • the process of informing the UE to serve the cell handover is generally performed based on the RRC signaling, and the RRC signaling interaction process has a long delay, which cannot be quickly communicated. Know the defects of the UE serving cell handover.
  • the embodiment of the present invention provides a solution to the defect of the prior art, that is, the Medium Access Control (hereinafter referred to as MAC) control packet data unit information, that is, the "MAC control PDU", notifies the UE that the serving cell switches or passes.
  • the physical control channel notifies the UE of the serving cell handover, and both the schemes can shorten the serving cell handover time and ensure that the UE quickly switches to the target serving cell.
  • the advantages of the embodiments of the present invention are: dynamic switching of the serving cell; The UE can be quickly notified of the handover of the serving cell.
  • the main application is that the channel quality of the user control channel on the cell edge decreases rapidly (for example, the UE moves at a high speed), and the UE can be switched in time to prevent the handover from failing.
  • the following is a detailed introduction.
  • FIG. 1 is a flowchart of Embodiment 1 of a serving cell handover indication method according to the present invention. As shown in FIG. 1, the method includes:
  • Step 100 Determine a target serving cell that is used to send control information to the user equipment.
  • the UE is in the wireless communication network, and the multiple cells in the base station can provide control information for the UE based on the CoMP technology.
  • the base station can send the control information to the UE through the cell with the best channel quality. . Therefore, the UE can measure the channel quality of each cell and report it to the base station. After receiving the channel quality information of each cell sent by the UE, the base station can dynamically report the channel quality indicator (CQI). Select the serving cell in the candidate set).
  • CQI channel quality indicator
  • the scheduler or the RRC or the MAC or the high-layer entity in the base station determines the target serving cell that provides the control information for the UE according to the channel quality information reported by the UE, that is, selects the cell with the best channel quality in each cell as the new serving cell.
  • the UE provides control information.
  • the channel quality information optionally includes a measured value of a fast channel change of the channel and/or a measured value of a slow channel change, where the measured value of the fast channel change includes a CQI and/or a precoding matrix indication (Precoding Matrix Indication) (hereinafter referred to as: PMI) and channel state information (CSI) and/or measured values of slow channel change include Reference Signal Received Power (RSRP) and/or reference.
  • PMI Precoding Matrix Indication
  • CSI channel state information
  • measured values of slow channel change include Reference Signal Received Power (RSRP) and/or reference.
  • RSRP Reference Signal Received Power
  • the measured value may include an uplink measurement result or a downlink measurement result, such as a sounding reference signal (SRS) and/or a physical uplink shared channel (Physical Uplink Share Channel hereinafter referred to as PUSCH) and/or Or the measurement result of the physical uplink control channel (Physical Uplink Control Channel; hereinafter referred to as PUCCH).
  • SRS sounding reference signal
  • PUSCH Physical Uplink shared channel
  • PUCCH Physical Uplink Control Channel
  • the target serving cell in addition to the channel quality, other factors may be considered, such as the cell load condition and the UE speed condition. If the source serving cell is heavily loaded, the UE may be handed over to other cells to reduce the load. If the UE is too fast, you can switch it to the neighboring cell as soon as possible.
  • Step 101 Generate MAC Control PDU information indicating that the user equipment is handed over from the source serving cell to the target serving cell, where the MAC Control Packet Data Unit (MAC Control PDU) information includes An index or a cell identifier of the target serving cell;
  • MAC Control PDU MAC Control Packet Data Unit
  • the base station After selecting the target serving cell, the base station notifies the UE to the selected target serving cell in time. In this embodiment, the base station notifies the UE by means of a "MAC control PDU". Specifically, the base station generates MAC control packet data unit information, that is, a "MAC control PDU" according to the index or the cell identifier of the target serving cell, that is, the "MAC control PDU" sent by the base station to the UE carries the index of the target serving cell or The cell ID (Cell ID) of the target serving cell. The index of the target serving cell may be used to notify the UE of the target serving cell by using an index of the target serving cell in the "MAC control PDU".
  • Step 102 Send the MAC control packet data unit information to the user equipment.
  • the "MAC control PDU” is sent to the UE by the Hybrid-Automatic Repeat Request (HQQ) process to indicate the UE handover.
  • the target serving cell corresponding to the index or cell identifier carried by the "MAC control PDU” receives control information.
  • the base station may also generate the MAC packet data unit information, that is, the "MAC PDU” together with other data or control block information, and then send the MAC PDU to the UE.
  • the base station informs the UE of the target serving cell
  • the UE successfully acquires the index or the cell identifier of the target serving cell
  • the UE successfully obtains the "MAC cont ro l PDU" and successfully decodes the "MAC cont ro l PDU”.
  • the acknowledgment response information that is, the "ACK” message is returned.
  • the UE does not successfully obtain the index or the cell identifier of the target serving cell
  • the "MAC cont ro l PDU" is not successfully obtained, or although "MAC cont ro PDU” is obtained, l PDU” but failed to decode correctly, it will return a failure response message, that is, a "NACK" message.
  • the base station sends the control information only through the target serving cell.
  • the source serving cell indicates that the target serving cell handover succeeds through the X2 interface, and notifies the target serving cell to start sending the UE control information, for example, sending signaling to carry the startup time, notifying the target serving cell to start immediately or in the specified system frame number. (Sys tem Frame Number; hereinafter referred to as: SFN) Start.
  • the target serving cell starts to send control information through the PDCCH, and feeds back an acknowledgement message to the source serving cell.
  • the source serving cell stops transmitting control information to the UE after receiving the acknowledgement message of the target serving cell.
  • the target serving cell may not send feedback to the source serving cell.
  • the source serving cell After the source serving cell sends the handover success message, the source serving cell automatically stops transmitting control information through the PDCCH after a period of time; if the base station receives the HARQ process feedback as a "NACK" message, the base station re-routes The UE sends a "MAC cont ro l PDU".
  • the base station may simultaneously send the control information to the UE through the source serving cell and the target serving cell, in particular, the base station
  • the UE After the UE sends the "MAC cont ro l PDU" including the index or the cell identifier of the target serving cell, it waits for the second predetermined time; then, the source serving cell and the target serving cell simultaneously transmit the control information, and the source serving cell notifies through the inter-base station interface X2.
  • the target serving cell initiates the transmission of the UE control information. Send, for example, send signaling to carry the start time, notify the target serving cell to start immediately or at the specified
  • the base station can immediately start the source service cell and the target serving cell to simultaneously transmit control information without waiting for the second predetermined time. Then, the UE can stop detecting the source serving cell immediately after correctly decoding the "MAC contro l PDU", and directly start the control information reception of the target serving cell.
  • the second predetermined time is related to the UE decoding "MAC control PDU” time and "MAC control PDU” air interface transmission time (ropagat ion roundtr ip t ime ), for example, it can be set to 4 ms.
  • the base station After the base station notifies the UE of the target serving cell, if the UE successfully decodes the "MAC control PDU", it will return an "ACK” message to the base station, if the UE does not successfully obtain the "MAC control PDU", or obtains the "MAC cont rol PDU” " But if it is not decoded correctly, it will return a "NACK” message. If the HARQ process received by the base station feeds back an "ACK” message, the base station stops transmitting the control information through the source serving cell, and transmits the control information only through the target serving cell. If the HARQ process received by the base station feeds back a "NACK” message, the base station resends the "MAC control PDU" to the UE.
  • the target serving cell may indicate that the source serving cell stops transmitting control information through the interface X2 between the base stations.
  • the base station can quickly notify the UE of the target serving cell handover by adding a new "MAC contro l PDU" for instructing the UE to perform the serving cell handover, and can shorten the serving cell handover time. , ensuring fast switching of the serving cell; and switching data during the switching process is not interrupted, achieving smooth switching.
  • FIG. 2 is a flowchart of Embodiment 1 of a serving cell handover method according to the present invention. As shown in FIG. 2, the method includes:
  • Step 200 Obtain MAC control packet data unit information that is sent by the network side to indicate that the user equipment is handed over from the source serving cell to the target serving cell, where the MAC control packet data unit information includes an index or a cell identifier of the target serving cell.
  • the UE may measure the channel quality information of each cell and report it to the base station. After receiving the channel quality information of each cell sent by the UE, the base station selects the serving cell according to the channel quality information, and generates and is used to instruct the UE to switch from the source serving cell to the target. "MAC control PDU" of the serving cell, The index or the cell identifier of the target serving cell is carried.
  • Step 201 Receive control information by using a target serving cell corresponding to the index or the cell identifier.
  • the acknowledgment response information is returned.
  • An "ACK" message and after waiting for a third predetermined time, for example, N subframes, receiving control information through the PDCCH on the target serving cell by receiving control information from the target serving cell corresponding to the index or the cell identifier.
  • the selection principle of N may include the following one or more delays: The first time of the N subframes is to ensure that the source serving cell correctly decodes the "ACK" sent by the UE uplink.
  • the small-area cooperative delay for example, the source serving cell indicates that the target serving cell handover success message transmits a handshake delay between the source serving cell and the target serving cell; and third, the HARQ RTT delay.
  • the value of N can be reported in the static default configuration or in a semi-static signaling manner. Of course, it is also possible to immediately start receiving control information through the PDCCH on the target serving cell without waiting for the third predetermined time.
  • the UE may immediately stop receiving the PDCCH in the source serving cell and start receiving in the target serving cell.
  • the UE may also receive the control information in the target serving cell corresponding to the index or the cell identifier. At the same time, the control information is received through the source serving cell until the stable handover is completed. Thereafter, the UE stops receiving control information at the source serving cell and receives control information only at the target serving cell. Further, the stable handover completion can be determined in the following manner, and is of course not limited to the following:
  • the control information is received only by the target serving cell, that is, the receiving of the control information by the source serving cell is stopped.
  • a timer can be set in the UE to determine that the target serving cell is stable. The length of time or signal quality of the received control information is better than the duration of the source serving cell.
  • the UE receives the data information sent by the base station through the PDSCH channel through the target serving cell, the UE receives the control information only through the target serving cell, that is, stops receiving the control information through the source serving cell.
  • the UE receives the feedback information (ACK/NACK) of the HARQ process sent by the base station through the target serving cell, the UE receives the control information only through the target serving cell, that is, stops receiving the control information through the source service cell.
  • ACK/NACK feedback information
  • the control information is received only through the target serving cell, that is, the control information is stopped by the source serving cell.
  • the control information is not received by the source serving cell within the fifth predetermined time, the control information is received only through the target serving cell, that is, the control information is stopped from being received by the source serving cell. That is to say, the UE receives the control information in the target serving cell, but does not receive the control information in the source serving cell within a certain period of time, indicating that the base station has stably switched the serving cell to the target serving cell.
  • the UE may negotiate with the base station according to the actual situation in advance, and in particular, the predetermined time may be zero, that is, immediately started.
  • the embodiment further includes: if the UE does not successfully obtain the index or the cell identifier of the target serving cell, the UE returns the failure response information to the base station or does not respond, and may prepare to acquire the “MAC control PDU” sent by the base station again.
  • the UE receives and decodes the "MAC contro l PDU" sent by the base station to indicate that the UE performs the serving cell handover, and quickly learns the handover information and performs the handover of the serving cell in time, which can not only shorten
  • the serving cell handover time ensures fast switching of the serving cell; and the switching data is not interrupted during the handover process, and smooth switching is achieved.
  • the high-level control cell may be considered to be different from the serving cell (serving cel l) in which the physical layer sends control information:
  • High-level control cell Manage high-level related algorithms and functions, such as radio resource management (Radio
  • RRM Resource Management
  • RB wireless Bearer
  • It may be a logical virtual cell (Vi r tua l cel l ) formed by a coordinated cell set (CoMP set), or may be an LTE R8 legacy cell.
  • the measured values of the slow channel change, such as RSRP, RSRQ, and PL, are used as the switching signal quality reference, and the switching process is semi-statically changed.
  • Serving cel l A cell that transmits control information through the PDCCH, with fast channel change measurements such as CQI, PMI, and CSI as the switching signal quality reference, which may be dynamically changed.
  • the high-level control cell and the serving cell ( serving ce ll ) that transmit control information at the physical layer are the same cell, and the measured values of the slow channel change, such as RSRP, RSRQ, and PL, are used as the switching signal quality reference, and the handover is performed.
  • the process is semi-statically changing.
  • the change of the UE service cell can be quickly notified by the "MAC contro l PDU" in the high-layer switching process, such as the RRC signaling indication, so that the PDCCH channel is handed over to the target serving cell before the high-layer handover procedure is completed.
  • the dynamic handover method provided by the foregoing embodiment may be used to quickly notify the UE to switch the serving cell.
  • the cell service with the best channel quality is adopted.
  • the high-level control cell and the serving cell that the control layer sends the control information may be the same cell, and the measured values of the fast channel change, such as CQI, PMI, and CSI, are used as the switching signal quality reference.
  • the base station may determine, in the first predetermined time, if the channel quality of the target serving cell is higher than the channel quality of the source serving cell, send a "MAC cont rol PDU" to the UE, and notify the UE to perform dynamic switching of the serving cell. . That is, the network side continuously transmits control information in multiple cells at the same time, and the base station starts a timer.
  • a forwarding channel for controlling information between the source serving cell and the target serving cell may be established, that is, a forwarding channel for establishing UE control information of the source serving cell and the target serving cell is added, so that the source serving cell and the target serving cell are used.
  • the same control information, and the control information is forwarded between cells through the X2 interface.
  • the source serving cell forwards the control information that it wants to transmit to the UE to
  • the target serving cell enables the target serving cell to simultaneously send the same control information to the UE to ensure that the data is not interrupted.
  • the control information mainly includes related information, scheduling information, and the like transmitted on the PDCCH.
  • the UE In the dynamic handover process of the serving cell, after receiving the handover indication, the UE does not return a response message. In this case, it is determined whether to return an "ACK" or "NACK” message to the source serving cell or the target serving cell.
  • the physical uplink control channel (PUCCH) is re-assigned by the cell transmitting the control information, and the PUCCH information can be simultaneously received by a single cell or two cells.
  • the assignment method may include two modes: a default transmission mode: the PUCCH resource used for the feedback is explicitly allocated by the source serving cell or the target serving cell, or is explicitly indicated by the PDCCH dynamic indication or "MAC cont" by the network side. Ro l PDU" or RRC signaling indication.
  • the UE when returning the response message, the UE sends an "ACK" or "NACK” message to the source serving cell or the target serving cell in the base station according to a predetermined sending manner with the base station or according to an indication of the base station. Or the UE abandons the current ACK/NACK feedback, and the base station considers that the current transmission is NACK, and then resends the "MAC cont ro l PDU".
  • the base station notifies the UE of the serving cell by using the newly created "MAC cont ro l PDU", thereby shortening the serving cell handover time and ensuring the fast handover of the serving cell. And the switching data is not interrupted during the switching process, achieving smooth switching.
  • FIG. 3 is a flowchart of Embodiment 2 of a serving cell handover indication method according to the present invention. As shown in FIG. 3, the method includes:
  • Step 300 Determine a target serving cell that is used to send control information to the user equipment.
  • the UE is in the wireless communication network, and the multiple cells in the base station can provide control information for the UE based on the CoMP technology.
  • the base station can send the control information to the UE through the cell with the best channel quality. . Therefore, the UE measures the channel quality information of each cell and reports it to the base station. After receiving the channel quality information of each cell sent by the UE, the base station selects the serving cell in the CQI report set (also the candidate set of scheduling).
  • the RRC or the RRC or the MAC or the high-layer entity determines the target serving cell that provides the control information for the UE according to the channel quality information reported by the UE, that is, selects the cell with the best channel quality in each cell as the new serving cell to provide the UE with control information.
  • the channel quality information optionally includes a measured value of a fast channel change of the channel and/or a measured value of a slow channel change, where the measured value of the fast channel change includes CQI, PMI, and CS I, and the slow channel changes.
  • the measured values include RSRP, RSRQ, and PL.
  • the measured value may include an uplink measurement result or a downlink measurement result such as an SRS, a measurement result of a PUSCH channel, or the like.
  • Step 301 Generate a handover indication message, where the user equipment is switched from the source serving cell to the target serving cell, where the handover indication message includes an index or a cell identifier of the target serving cell.
  • Step 302 Send the handover indication message to the user equipment by using a physical layer control channel.
  • the base station needs to notify the UE of the selected target serving cell in time.
  • the base station notifies the UE through a physical layer control channel, for example, a PDCCH.
  • the base station sends a handover indication message to the UE in the physical layer control channel, and carries an index or a cell identifier of the target serving cell.
  • the index of the target serving cell may be used to notify the index value of the UE candidate cell semi-statically through high layer signaling in advance.
  • the UE can immediately switch to the target serving cell to receive control information.
  • the serving cell handover indication method provided in this embodiment is similar to the notification mode procedure of the "MAC cont ro l PDU", except that the base station does not need ACK acknowledgment in the method, but is guaranteed by the PDCCH channel design.
  • the physical layer control channel is used to quickly notify the UE of the target serving cell handover, which can shorten the serving cell handover time and ensure dynamic switching of the serving cell; and the switching data is not interrupted during the switching process, and smooth handover is implemented.
  • FIG. 4 is a flowchart of Embodiment 2 of a method for switching a serving cell according to the present invention. As shown in FIG. 4, the method includes:
  • Step 400 The handover indication message sent by the network side, which is sent by the physical layer control channel, is used to indicate that the user equipment is handed over from the source serving cell to the target serving cell, where the handover indication is cancelled.
  • the information includes an index or a cell identifier of the target serving cell;
  • the UE measures the channel quality information of each cell and reports it to the base station. After receiving the channel quality information of each cell sent by the UE, the base station dynamically selects the serving cell, and sends a handover indication message to the UE through the physical layer control channel, where the target carries the target. The index or cell identifier of the serving cell. The UE receives the handover indication message.
  • Step 401 Receive control information by using a target serving cell corresponding to the index or the cell identifier. After receiving the handover indication message sent by the base station through the physical layer control channel, the UE receives the control information sent by the base station through the target serving cell according to the index or the cell identifier of the target serving cell.
  • the UE quickly learns the handover information through the physical layer control channel and performs the handover of the serving cell in time, which not only shortens the serving cell handover time, but also ensures dynamic switching of the serving cell; and switches during the handover process.
  • the data is not interrupted, achieving smooth switching.
  • the high-level control cell and the serving cell ( serving cel l ) that transmit control information at the physical layer are different:
  • High-level control cell Manage high-level related algorithms and functions, such as RRM, Sl, RB management, etc. It may be a logical virtual cell (Vi r tua l cel l ) formed by a CoMP set, or may be an R8 legacy cell.
  • the measurement process of the slow channel change, such as RSRP, RSRQ, and PL, is used as the switching signal quality reference, and the switching process is semi-statically changed.
  • Serving cel l The cell that sends control information, with fast channel change measurements such as CQI, PMI, and CS I as the switching signal quality reference, can be dynamically changed.
  • the high-level control cell and the serving cell that send control information at the physical layer are the same cell, and the measured values of the slow channel change, such as RSRP, RSRQ, and PL, are used as the switching signal quality reference, and the switching process is a semi-static change. of.
  • the high-level control cell and the serving cell that the control layer sends the control information are the same cell, and the measured values of the fast channel change, such as CQI, PMI, and CSI, are used as the switching signal. Quality reference.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of a base station according to the present invention.
  • the base station includes a first determining module 11, a first generating module 12, and a first sending module 13, where the first determining module 11 is configured to determine a target serving cell that sends control information to the UE; the first generating module 12 is configured to generate a “MAC control PDU” for instructing the UE to switch from the source serving cell to the target serving cell, where the index or the cell identifier of the target serving cell is included;
  • a sending module 13 is configured to send the "MAC cont rol PDU" to the UE.
  • the CoMP UE is in the wireless communication network, and the base station needs to send the control information to the UE through the cell with the best channel quality in order to ensure the success rate of the control information. Therefore, the UE measures the channel quality information of each cell and reports it to the base station.
  • the first determining module 11 in the base station dynamically selects the serving cell after receiving the channel quality information of each cell sent by the UE. Specifically, the base station determines, according to the channel quality information reported by the UE, a target serving cell that provides control information for the UE, that is, selects a cell with the best channel quality in each cell as a new serving cell to provide control information for the UE.
  • the channel quality information described therein may include measurements of fast channel variations of the channel and/or measurements of slow channel changes.
  • the first generating module 12 After the first determining module 11 selects the target serving cell, the first generating module 12 generates MAC control packet data unit information, that is, "MAC control PDU" according to the index or the cell identifier of the target serving cell. Then, the "MAC control PDU” generated by the first generation module 12 is transmitted to the UE through the first transmitting module 13.
  • the first sending module 13 may also send a "MAC control PDU" to the UE if the channel quality of the target serving cell is higher than the channel quality of the source serving cell within the first predetermined time.
  • the first generation module 12 may also encapsulate the "MAC control PDU" with other control information into a "MAC PDU” and send it to the UE by the first sending module 13.
  • the base station provided in this embodiment may further include a first processing module 14 and a first processing module 14 Specifically, if the "ACK" message sent by the UE is received, the control information is sent by the target serving cell. Or, after waiting for the second predetermined time, sending the control information by using the source serving cell and the target serving cell, and stopping receiving the control information by using the source serving cell after receiving the "ACK" message sent by the UE. Or for receiving the "NACK” message sent by the UE, instructing the first sending module 13 to re-transmit the "MAC cont ro l PDU" including the index or the cell identifier of the target serving cell to the UE.
  • the first sending module 13 is further configured to send a “MAC cont ro l PDU” to the UE if the channel quality of the target serving cell is higher than the channel quality of the source serving cell in the first predetermined time.
  • the base station further includes a first indication module 15 for indicating whether the UE sends acknowledgement response information or failure response information to the source serving cell or the target serving cell, and the first indication module 15 may dynamically indicate by using the PDCCH or "MAC cont ro l PDU" Or the RRC signaling indication indicates that the UE may return response information to the specified cell according to the indication of the base station or the default setting.
  • the base station provided in this embodiment can quickly notify the UE of the handover of the target serving cell by adding a new "MAC cont ro l PDU" for instructing the UE to perform the serving cell handover, thereby shortening the serving cell handover time and ensuring the serving cell. Dynamic switching; and switching data during the switching process is not interrupted, achieving smooth switching.
  • FIG. 6 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • the UE includes a first acquiring module 21 and a first receiving module 22, where the first acquiring module 21 is configured to obtain an indication sent by the network side.
  • the UE switches from the source serving cell to the "MAC cont ro l PDU" of the target serving cell; the first receiving module 22 is configured to receive the control information through the target serving cell corresponding to the index or the cell identifier.
  • the UE measures the channel quality information of each cell, and reports the information to the base station.
  • the base station dynamically selects the serving cell, and generates a message for instructing the UE to switch from the source serving cell to the target service.
  • a "MAC cont ro l PDU" of the cell which carries an index or cell identity of the target serving cell.
  • the first obtaining module 21 in the UE receives and parses the "MAC cont ro l PDU", and if the index or the cell identifier of the target serving cell is successfully acquired, the first receiving Module 22 returns an "ACK" message to the base station and receives control information via the target serving cell corresponding to the index or cell identity.
  • the first receiving module 22 receives the control channel information on the target serving cell, and may start immediately, or may start after waiting for the third predetermined time.
  • the first receiving module 22 is further configured to receive the control information by using the source serving cell while receiving the control information by the target serving cell corresponding to the index or the cell identifier.
  • the UE provided in this embodiment further includes a third sending module 23, configured to return an "ACK" or "NACK” message to the source serving cell or the target serving cell in the base station according to a predetermined sending manner with the base station or according to the indication of the base station.
  • the predetermined transmission mode is the default transmission mode:
  • the PUCCH resource used for the feedback is explicitly specified in the protocol, and is allocated by the source serving cell or the target serving cell.
  • the indication of the base station includes a base station dynamically indicated by PDCCH or "MAC cont ro l PDU" or RRC signaling indication.
  • the user equipment provided by the embodiment receives the "MAC cont ro l PDU" newly created by the base station, and timely learns the transformation of the serving cell, thereby shortening the switching time of the serving cell and ensuring dynamic switching of the serving cell; and the switching data is not interrupted during the handover process. Achieve smooth switching.
  • FIG. 7 is a schematic diagram of a first embodiment of a network system according to the present invention.
  • the network system includes a base station 1 and a user equipment, that is, UE2, where the base station 1 is configured to determine a target serving cell for transmitting control information for the UE2.
  • the UE2 sends a generated "MAC cont ro l PDU" for instructing the UE 2 to switch from the source serving cell to the target serving cell, carrying the index or cell identifier of the target serving cell; and the UE 2 is configured to acquire the "MAC cont ro l sent by the base station 1 PDU" and receiving control information through a target serving cell corresponding to the index or the cell identity.
  • the base station and the user equipment involved in the network system provided in this embodiment may use the base station and the user equipment provided in the foregoing embodiments. The specific structure and function are not described herein again.
  • the base station can quickly notify the UE of the handover of the target serving cell by adding a new "MAC cont ro l PDU" for instructing the UE to perform the serving cell handover, thereby shortening the serving cell handover time.
  • FIG. 8 is a schematic structural diagram of Embodiment 2 of a base station according to the present invention.
  • the base station includes a second determining module 31, a second generating module 32, and a second sending module 33, where the second determining module 31 is used. Determining a target serving cell for transmitting control information for the UE; the second generating module 32 is configured to generate a handover indication message for instructing the UE to switch from the source serving cell to the target serving cell, where the handover indication message includes the target An index or a cell identifier of the serving cell; the second sending module 33 is configured to send the handover indication message to the UE by using a physical layer control channel.
  • the CoMP UE is in the wireless communication network, and the base station needs to send the control information to the UE through the cell with the best channel quality in order to ensure the success rate of the control information. Therefore, the UE measures channel quality information of each cell and reports it to the base station. After receiving the channel quality information of each cell sent by the UE, the second determining module 31 of the base station dynamically selects the serving cell, that is, selects the best channel quality in each cell. The cell serves as a new serving cell to provide control information for the UE.
  • the channel quality information described therein may include a measured value of a fast channel change of the channel and/or a measured value of a slow channel change.
  • the second determining module 31 determines the target serving cell
  • the selected target serving cell needs to be notified to the UE in time.
  • the second sending module 33 in the base station sends a handover indication message to the UE in the physical layer control channel, and Carry the index or cell identifier of the target serving cell.
  • the UE can immediately switch to the target serving cell to receive the control information.
  • the base station provided in this embodiment can quickly notify the UE of the target serving cell handover through the physical layer control channel, can shorten the serving cell handover time, and ensure the dynamic handover of the serving cell; and the handover data is not interrupted during the handover process, and smooth handover is implemented.
  • FIG. 9 is a schematic structural diagram of Embodiment 2 of a user equipment according to the present invention.
  • the UE includes a second acquiring module 41 and a second receiving module 42, where the second acquiring module 41 is configured to acquire a physical layer control channel on the network side. And a handover indication message for indicating that the UE is handed over from the source serving cell to the target serving cell, where the handover indication message includes an index or a cell identifier of the target serving cell; and the second receiving module 42 is configured to use the target corresponding to the index or the cell identifier.
  • the serving cell receives control information.
  • the UE measures the channel quality information of each cell, and reports the information to the base station.
  • the base station dynamically selects the serving cell, and sends a handover indication message to the UE through the physical layer control channel, where An index or cell mark carrying the target serving cell Knowledge.
  • the second receiving module 42 receives the index or the cell identifier of the target serving cell that is carried by the handover indication message, and receives the downlink that is sent by the base station through the target serving cell. Control information.
  • the UE provided in this embodiment can quickly learn the handover information through the physical layer control channel and perform the handover of the serving cell in time, which not only shortens the handover time of the serving cell, but also ensures the dynamic handover of the serving cell; and the handover data is not interrupted during the handover process, and is smoothed. Switch.
  • the network system includes a base station 3 and a user equipment, that is, UE4, where the base station 3 is configured to determine a target serving cell for transmitting control information for the UE4, and Transmitting, by the physical layer control channel, a handover indication message for instructing the UE4 to switch from the source serving cell to the target serving cell, where the handover indication message includes an index or a cell identifier of the target serving cell, and the UE4 is configured to acquire the handover indication sent by the base station 3. a message, and receiving control information through a target serving cell corresponding to the index or the cell identity.
  • the base station and the user equipment involved in the network system provided in this embodiment may use the base station and the user equipment provided in the foregoing embodiments. The specific structure and function are not described herein again.
  • the base station quickly notifies the UE of the target serving cell handover through the physical layer control channel, and can shorten the serving cell handover time.
  • the function implemented by the cell in the foregoing embodiment may also be implemented by the AP, where the relationship between the AP and the cell (cell) in the traditional sense may be that one cell includes one AP, or one cell includes multiple APs, and the foregoing embodiment may be regarded as An example in which a cell includes only one AP, that is, a cell corresponds to an AP. Obviously, when a cell includes multiple APs, each AP can be equivalent to one coordinated cell, and the embodiment of the present invention can also be implemented.

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Description

服务小区切换指示方法、 服务小区切换方法和装置 技术领域
本发明实施例涉及通信技术领域，尤其涉及一种服务小区切换指示方法、 服务小区切换方法和装置。 背景技术
在无线通信***中， 多点协作发射 /接收（ Coordinated Multi-Point; 以下 简称： CoMP )技术是提高小区整体性能及小区边缘用户性能的一个重要手段。 下行多点协作发射是指多个地理位置分散的发射点联合为用户设备（ User Equipment; 以下简称： UE )发送数据， 上行多点协作接收是指多个地理位 置分散的接收点共同接收 UE的数据并进行联合处理。
CoMP ***中， 网络节点包括基站 （ eNodeB ) 和一些接入点例如小区 ( cell ),传输接收节点（ transmission and reception point ),无线射频单元（ RRU ) 和接入节点 （Access Point; 以下简称： AP )等， 其中 "AP" 是一个至少包 括射频收发信机的一个节点， AP上可以配置单个天线元或多个天线元。 多个 AP在地理位置上分散分布并连接到基站。 在 CoMP中， 多个 AP可以协作发 射和接收 UE数据，这些协作的 AP可以来自同一个基站，也可以来自不同的 基站。 AP和传统意义上的小区 （cell ) 的关系可以是一个小区包含一个 AP, 或一个小区包含多个 AP; 为描述方便以下以一个 cell包含一个 AP为例来说 明。通常，在多个 AP为 UE服务时， UE会选择一个 AP作为服务小区（ anchor cell, PDCCH cell )来传输一些控制信息， 例如可以通过该 AP的物理下行控 制信道（Physical Downlink Control Channel; 以下简称： PDCCH)传输这些控 制信息， 其它 AP 只提供业务信息， 例如可以仅通过物理下行共享信道 (Physical Downlink Shared Channel; 以下简称： PDSCH)传输业务信息， 不发 送控制信息。 在实现本发明过程中， 发明人发现： 现有的小区切换流程都是无线资源 控制 （Radio Resource Control; 以下简称： RRC)信令交互过程， 涉及到空口、 X2 (基站之间的接口 ) 、 S1 (基站与核心网 （MME )之间的接口）接口上多 次握手过程， 导致高层信令握手流程的时延较长， 无法快速的通知 UE服务 小区切换。 发明内容
本发明实施例提供一种服务小区切换指示方法、 服务小区切换方法和装 置， 用以解决现有技术中无法快速通知 UE服务小区切换的缺陷， 使得服务 小区选择的结果可以快速准确地通知到 UE, 实现快速服务小区切换。
本发明实施例提供一种服务小区切换指示方法， 包括：
确定用于为用户设备发送控制信息的目标服务小区；
生成用于指示所述用户设备从源服务小区切换到所述目标服务小区的介 质访问控制子层控制分组数据单元信息 , 所述介质访问控制子层控制分组数 据单元信息包括所述目标服务小区的索引或小区标识；
向所述用户设备发送所述介质访问控制子层控制分组数据单元信息。 本发明实施例提供一种服务小区切换指示方法， 包括：
确定用于为用户设备发送控制信息的目标服务小区；
生成用于指示所述用户设备从源服务小区切换到所述目标服务小区的切 换指示消息， 所述切换指示消息包括所述目标服务小区的索引或小区标识； 通过物理层控制信道向所述用户设备发送所述切换指示消息。
本发明实施例提供一种服务小区切换方法， 包括：
获取网络侧发送的用于指示用户设备从源服务小区切换到目标服务小区 的介质访问控制子层控制分组数据单元信息 , 所述介质访问控制子层控制分 组数据单元信息包括所述目标服务小区的索引或小区标识；
通过与所述索引或小区标识对应的目标服务小区接收控制信息。 本发明实施例提供一种服务小区切换方法， 包括：
接收网络侧通过物理层控制信道发送的用于指示所述用户设备从源服务 小区切换到所述目标服务小区的切换指示消息， 所述切换指示消息包括所述 目标服务小区的索引或小区标识；
通过与所述索引或小区标识对应的目标服务小区接收控制信息。
本发明实施例提供一种基站， 包括：
第一确定模块， 用于确定用于为用户设备发送控制信息的目标服务小区； 第一生成模块， 用于生成用于指示所述用户设备从源服务小区切换到所 述目标服务小区的介质访问控制子层控制分组数据单元信息， 所述介质访问 控制子层控制分组数据单元信息包括所述目标服务小区的索引或小区标识； 第一发送模块， 用于向所述用户设备发送所述介质访问控制子层控制分 组数据单元信息。
本发明实施例提供一种基站， 包括：
第二确定模块， 用于确定用于为用户设备发送控制信息的目标服务小区； 第二生成模块， 用于生成用于指示所述用户设备从源服务小区切换到所 述目标服务小区的切换指示消息， 所述切换指示消息包括所述目标服务小区 的索引或小区标识；
第二发送模块， 用于通过物理层控制信道向所述用户设备发送所述切换 指示消息。
本发明实施例提供一种用户设备， 包括：
第一获取模块， 用于获取网络侧发送的用于指示用户设备从源服务小区 切换到目标服务小区的介质访问控制子层控制分组数据单元信息， 所述介质 访问控制子层控制分组数据单元信息包括所述目标服务小区的索引或小区标 识；
第一接收模块， 用于通过与所述索引或小区标识对应的目标服务小区接 收控制信息。 本发明实施例提供一种用户设备， 包括：
第二获取模块， 用于获取网络侧通过物理层控制信道发送的用于指示所 述用户设备从源服务小区切换到所述目标服务小区的切换指示消息， 所述切 换指示消息包括所述目标服务小区的索引或小区标识；
第二接收模块， 用于通过与所述索引或小区标识对应的目标服务小区接 收控制信息。
本发明实施例提供一种网络***， 包括：
基站， 用于确定用于为所述用户设备发送控制信息的目标服务小区， 向 所述用户设备发送生成的用于指示所述用户设备从源服务小区切换到所述目 标服务小区的介质访问控制子层控制分组数据单元信息， 所述介质访问控制 子层控制分组数据单元信息包括所述目标服务小区的索引或小区标识；
用户设备， 用于获取所述基站发送的用于所述介质访问控制子层控制分 组数据单元信息， 并通过与所述索引或小区标识对应的目标服务小区接收控 制信息。
本发明实施例提供一种网络***， 包括：
基站， 用于确定用于为所述用户设备发送控制信息的目标服务小区， 并 通过物理层控制信道向所述用户设备发送用于指示所述用户设备从源服务小 区切换到所述目标服务小区的切换指示消息， 所述切换指示消息包括所述目 标服务小区的索引或小区标识；
用户设备， 用于获取所述基站发送的所述切换指示消息， 并通过与所述 索引或小区标识对应的目标服务小区接收控制信息。
本发明实施例提供的服务小区切换指示方法、服务小区切换方法和装置， 能够快速地通知 UE 目标服务小区的切换， 能够缩短服务小区切换时间， 保 证了服务小区的动态切换。 附图说明 图 1为本发明服务小区切换指示方法实施例一流程图；
图 2为本发明服务小区切换方法实施例一流程图；
图 3为本发明服务小区切换指示方法实施例二流程图；
图 4为本发明服务小区切换方法实施例二流程图；
图 5为本发明基站实施例一结构示意图；
图 6为本发明用户设备实施例一结构示意图；
图 7为本发明网络***实施例一组成示意图；
图 8为本发明基站实施例二结构示意图；
图 9为本发明用户设备实施例二结构示意图；
图 10为本发明网络***实施例二组成示意图。 具体实施方式
下面结合附图和具体实施例进一步说明本发明实施例的技术方案。
在 CoMP中定义了当前可以为 UE提供服务的候选小区集合（上报集合， candida te CoMP set , CoMP repor t ing set ) , UE将上报该集合中小区的信 道质量等相关信息。 根据该信息， 调度器为 UE动态的选择合适的小区发送控 制信息与业务信息。 对于每一个 CoMP UE , 服务小区的选择可以是动态的。 网络侧根据上报的信道质量选择信号质量最好的小区发送控制信息 , 保证控 制信息正确接收。 为了配合动态的服务小区选择， 目标服务小区需要快速准 确的通知到 UE , 使其能够获得更好的控制信息服务。 服务小区的选择可以是 半静态的。 此时源服务小区的控制信息信号质量变化将较快， 网络侧也需要 将目标服务小区快速准确的通知到 UE , 使其能够获得更好的控制信息服务。
在无线通信***中， 随着多点协作发射 /接收技术的发展， 基站在 UE所 处的多个小区范围内动态选择为 UE提供的控制信息的服务小区已经成为提 高服务质量的重要课题，然而现有技术中通知 UE服务小区切换的流程一般是 基于 RRC信令完成的， 由于 RRC信令交互过程时延较长， 造成无法快速地通 知 UE服务小区切换的缺陷。本发明实施例针对现有技术的缺陷提供一种解决 方案即通过介质访问控制子层 （Medium Access Control; 以下简称： MAC) 控制分组数据单元信息即 "MAC control PDU" 通知 UE服务小区切换或者通 过物理控制信道通知 UE服务小区切换，两种方案均能够缩短服务小区切换时 间， 保证 UE快速的切换到目标服务小区， 应用本发明实施例优势在于： 服务 小区的动态切换； 服务小区半静态切换时可以快速通知 UE服务小区的切换， 主要应用在小区边缘用户控制信道质量变化下降较快（例如 UE高速运动） ， 可以及时的切换 UE, 防止切换失败。 以下分别进行详细介绍。
图 1为本发明服务小区切换指示方法实施例一流程图， 如图 1所示， 该 方法包括：
步骤 100, 确定用于为用户设备发送控制信息的目标服务小区；
UE处于无线通信网络中， 基站下的多个小区均可以基于 CoMP技术为该 UE提供控制信息， 当然为了保证控制信息的发送成功率， 基站可以将控制信 息通过信道质量最好的小区发送给 UE。 因此 UE可以测量各个小区的信道质 量， 并上报给基站， 基站接收 UE发送的各个小区的信道质量信息后， 可以动 态地在信道质量指示 （Channel Quality Indicator; 以下简称： CQI )上报 集合（也是调度的候选集合） 中选择服务小区。 具体地， 基站内部的调度器 或 RRC或 MAC或高层实体根据 UE上报的信道质量信息确定为 UE提供控制信 息的目标服务小区， 即选择各个小区中信道质量最好的小区作为新的服务小 区为 UE提供控制信息。其中所述的信道质量信息可选地包括信道的快速信道 变化的测量值和 /或慢速信道变化的测量值，其中快速信道变化的测量值包括 CQI和 /或预编码矩阵指示 (Precoding Matrix Indication; 以下简称： PMI ) 和信道状态指示（Channel state information; 以下简称： CSI )和 /或慢速 信道变化的测量值包括参考信号接收功率 （Reference Signal Received Power;以下简称： RSRP )和/或参考信号接收强度（ Reference Signal Received Quality; 以下简称： RSRQ )和 /或路径损耗（ PathLoss; 以下简称： PL ) 。 所述的测量值既可以包括上行测量结果也可以包括下行测量结果例如上行参 考符号 （ Sounding Reference Signal; 以下简称： SRS )和 /或物理上行共享 信道 (Physical Uplink Share Channel 以下简称： PUSCH)和 /或物理上行 控制信道（Physical Uplink Control Channel; 以下简称： PUCCH ) 的测量 结果等。
本实施例中确定目标服务小区时除了根据信道质量外， 还可以考虑其它 因素， 例如小区负载情况和 UE速度情况等， 如果源服务小区负载较重， 可以 将该 UE切换到其他小区以减轻负载； 如果 UE速度过快， 可以将其尽快切换 到相邻小区等等。
步骤 101, 生成用于指示所述用户设备从源服务小区切换到所述目标服 务小区的 MAC控制分组数据单元（ MAC control PDU )信息， 所述 MAC控制分 组数据单元（MAC control PDU)信息包括所述目标服务小区的索引或小区标 识；
基站在选取好目标服务小区后，将所选择的目标服务小区及时通知给 UE, 本实施例中基站通过 "MAC control PDU" 的方式通知 UE。 具体为， 基站根 据目标服务小区的索引或小区标识， 生成 MAC控制分组数据单元信息即 "MAC control PDU" , 也就是说基站发送给 UE的 "MAC control PDU" 中携带有目 标服务小区的索引或目标服务小区的小区标识（Cell ID) 。 其中所述的目标 服务小区的索引可以预先通过高层信令半静态的通知 UE候选小区的索引值， 在 "MAC control PDU" 中可以用目标服务小区的索引来通知 UE该目标服务 小区。
步骤 102 , 向所述用户设备发送所述 MAC控制分组数据单元信息。
基站生成好用于通知 UE 目标服务小区的 "MAC control PDU" 后， 通过 混合自动重传请求 ( Hybrid-Automatic Repeat Request; 以下简称： HARQ ) 进程将 "MAC control PDU" 发送给 UE, 指示 UE切换到与 "MAC control PDU" 所携带的索引或小区标识对应的目标服务小区接收控制信息。 当然本实施例中， 基站还可以将该 "MAC cont ro l PDU" 与其他数据或控 制块信息一起生成 MAC分组数据单元信息即 "MAC PDU" , 然后将该 MAC PDU" 发送给 UE。
基站通知 UE 目标服务小区后， 若 UE成功获取所述目标服务小区的索引 或小区标识后， 具体的， 即 UE成功获取到 "MAC cont ro l PDU" ，并成功解码 "MAC cont ro l PDU" 后， 返回确认响应信息， 即 "ACK" 消息， 若 UE没有成 功获取所述目标服务小区的索引或小区标识， 即没有成功获取到 "MAC cont ro l PDU" , 或者虽然获取到 "MAC cont ro l PDU" 但没能够正确解码， 则将返回失败响应信息即 "NACK" 消息。 可选的若基站接收到的 HARQ进程反 馈为 "ACK" 消息， 则基站仅通过目标服务小区发送控制信息。 此时， 源服务 小区通过 X2 接口指示目标服务小区切换成功， 通知目标服务小区启动对于 UE控制信息的发送， 例如， 发送信令携带启动时间， 通知目标服务小区立即 启动或在指定的***帧号 （Sys tem Frame Number ; 以下简称： SFN ) 启动。 目标服务小区收到指示后即开始通过 PDCCH发送控制信息， 并向源服务小区 反馈确认消息。源服务小区在收到目标服务小区的确认消息后停止向该 UE发 送控制信息。 目标服务小区也可以不向源服务小区进行反馈， 源服务小区发 送切换成功消息后一段时间后自动停止通过 PDCCH发送控制信息的； 若基站 接收到 HARQ进程反馈为 "NACK" 消息， 则基站重新向 UE发送 "MAC cont ro l PDU" 。
上述实施例中提供的服务小区切换指示方法中， 在任何时刻都是仅有一 个小区发送控制信息。
为了更好地为 UE提供控制信息， 基站可以在等待 UE反馈的时间内， 通 过源服务小区和目标服务小区同时向 UE 发送控制信息， 具体地为， 基站向
UE 发送包含目标服务小区的索引或小区标识的 "MAC cont ro l PDU" 之后， 等待第二预定时间；然后通过源服务小区和目标服务小区同时发送控制信息， 源服务小区通过基站间接口 X2通知目标服务小区启动对于 UE控制信息的发 送， 例如， 发送信令携带启动时间， 通知目标服务小区立即启动或在指定的
SFN 启动， 或者。 当然， 基站可以不等待第二预定时间， 立即启动源服务小 区和目标服务小区同时发送控制信息。 则 UE可以在正确解码 "MAC contro l PDU"后立即停止检测源服务小区，并直接启动目标服务小区的控制信息接收。 所述的第二预定时间与 UE解码 "MAC control PDU"时间 , "MAC control PDU" 空口传输时间 ( ropagat ion roundtr ip t ime )有关, 例如可以设定为 4ms。 基站通知 UE目标服务小区后， 若 UE成功解码 "MAC control PDU" 后， 将会 向基站返回 "ACK" 消息， 若 UE没有成功获取到 "MAC control PDU" , 或者 虽然获取到 "MAC cont rol PDU" 但没能够正确解码， 则将返回 "NACK" 消息。 若基站接收到的 HARQ进程反馈为 "ACK" 消息， 则基站停止通过源服务小区 发送所述控制信息，仅通过目标服务小区发送控制信息。若基站接收到的 HARQ 进程反馈为 "NACK" 消息， 则基站重新向 UE发送 "MAC control PDU" 。
如果 UE将 ACK反馈给目标服务小区， 此时， 目标服务小区可以通过基站 之间接口 X2指示源服务小区停止控制信息的发送。
以上实施例提供的服务小区切换指示方法中， 基站通过增加一种用于指 示 UE进行服务小区切换的新的 "MAC contro l PDU" , 快速通知 UE目标服务小 区的切换， 能够缩短服务小区切换时间， 保证了服务小区的快速切换； 而且 切换过程中切换数据不中断， 实现平滑切换。
图 2为本发明服务小区切换方法实施例一流程图， 如图 2所述， 该方法 包括：
步骤 200 , 获取网络侧发送的用于指示用户设备从源服务小区切换到目 标服务小区的 MAC控制分组数据单元信息， 所述 MAC控制分组数据单元信息 包括所述目标服务小区的索引或小区标识；
UE可以测量各个小区的信道质量信息， 并上报给基站， 基站接收 UE发 送的各个小区的信道质量信息后， 根据该信道质量信息选择服务小区； 并生 成用于指示 UE从源服务小区切换到目标服务小区的 "MAC control PDU" , 其中携带有目标服务小区的索引或小区标识。
步骤 201 , 通过与所述索引或小区标识对应的目标服务小区接收控制信 息。
若 UE成功获取所述目标服务小区的索引或小区标识后， 具体的， 即 UE 成功获取到 "MAC cont ro l PDU" ，并成功解码 "MAC cont ro l PDU" 后， 返回 确认响应信息， 即 "ACK" 消息， 并在等待第三预定时间例如 N个子帧后， 通 过与索引或小区标识对应的目标服务小区接收控制信息即启动在目标服务小 区上通过 PDCCH接收控制信息。 其中 N的选取原则可以包括以下一种或多种 时延的和： 第一、 N个子帧的时间是为了保证源服务小区正确解码 UE上行发 送的 "ACK" 。 第二、 小区间协作时延， 例如源服务小区指示目标服务小区切 换成功消息在源服务小区与目标服务小区间传输握手时延； 第三、 HARQ RTT 时延。 N 的取值可以采用静态默认配置或者是采用半静态信令通知的方式告 知 UE。 当然也可以不等待第三预定时间而立即启动在目标服务小区上通过 PDCCH接收控制信息。
对于基站发送完 "MAC cont ro l PDU" 后， 在源服务小区和目标服务小区 同时发送控制信息的情况， UE可以立即停止在源服务小区接收 PDCCH , 启动 在目标服务小区的接收。
对于基站发送完 "MAC cont ro l PDU" 后， 在源服务小区和目标服务小区 同时发送控制信息的情况， 可选地， UE也可以在通过与索引或小区标识对应 的目标服务小区接收控制信息的同时， 通过源服务小区接收控制信息， 直到 稳定切换完成。 之后， UE停止在源服务小区接收控制信息， 而仅在目标服务 小区接收控制信息。 进一步地， 稳定切换完成可以通过下述方式判断， 当然 并不限于以下方式：
若目标服务小区的信道质量高于源服务小区的信道质量的时间长于第四 预定时间， 则仅通过目标服务小区接收所述控制信息， 即停止通过源服务小 区接收所述控制信息。 可以在 UE内设置一定时器， 以判断目标服务小区稳定 接收控制信息时间长度或信号质量好于源服务小区的持续时间。
若 UE通过目标服务小区接收到基站通过 PDSCH信道发送的数据信息，则 仅通过目标服务小区接收控制信息， 即停止通过源服务小区接收控制信息。
若 UE 通过目标服务小区接收到基站发送的 HARQ 进程的反馈信息 ( ACK/NACK ) ， 则仅通过目标服务小区接收控制信息， 即停止通过源服务小 区接收控制信息。
若 UE持续的接收到目标服务小区的控制信道超过一段时间，则仅通过目 标服务小区接收控制信息， 即停止通过源服务小区接收控制信息。
若在第五预定时间内没有通过源服务小区接收到控制信息， 则仅通过目 标服务小区接收控制信息， 即停止通过源服务小区接收控制信息。 也就是说 UE在目标服务小区收到控制信息， 而一定时间内在源服务小区却没有收到控 制信息， 说明基站已经稳定地将服务小区切换到目标服务小区上了。 上述的 各个预定时间， UE均可以预先与基站根据实际情况协商设定， 特别的， 预定 时间可以为零， 即立即启动。
可选地，本实施例还包括 UE若没有成功获取目标服务小区的索引或小区 标识， 则向基站返回失败响应信息或不作响应， 可以准备再次获取基站发送 的 "MAC control PDU" 。
本实施例提供的服务小区切换方法中， UE通过接收并解码基站发送的用 于指示 UE进行服务小区切换的 "MAC contro l PDU" , 快速获知切换信息并 及时进行服务小区的切换， 不但可以缩短服务小区切换时间， 保证了服务小 区的快速切换； 而且切换过程中切换数据不中断， 实现平滑切换。
上述各个实施例可以适用于但不限于以下三种不同的情况， 分别为： 第一种情况， 可以认为高层控制小区与物理层发送控制信息的服务小区 ( serving cel l )概念不同：
高层控制小区： 管理高层相关算法与功能， 例如无线资源管理（Radio
Resource Management以下简称： RRM ) 、 基站与核心网之间的接口 Sl、 无线 承载（Radio Bear; 以下简称： RB )管理等。 可以是一个协作小区集合（ CoMP set )形成的逻辑虚小区 （Vi r tua l cel l ) , 也可以是 LTE R8传统小区。 以 慢速信道变化的测量值例如 RSRP、 RSRQ、 PL作为切换信号质量参考， 切换过 程是半静态变化的。
服务小区 （serving cel l ) ： 通过 PDCCH发送控制信息的小区， 以快速 信道变化的测量值例如 CQI、 PMI和 CSI作为切换信号质量参考， 可以是动态 变化的。
第二种情况， 可以认为高层控制小区与物理层发送控制信息的服务小区 ( serving ce l l )为同一个小区， 以慢速信道变化的测量值例如 RSRP、 RSRQ、 PL作为切换信号质量参考， 切换过程是半静态变化的。 此时， 可以在高层切 换流程例如 RRC信令指示时， 通过 "MAC contro l PDU" 快速通知 UE服务小 区的变化，使得 PDCCH信道在高层切换流程完成之前先切换到目标服务小区。 并且在高层切换流程从开始到完成的过程中， 可以采用上述实施例提供的动 态切换的方法，快速的通知 UE切换服务小区。采用信道质量最好的小区服务。
第三种情况， 可以认为高层控制小区与物理层发送控制信息的服务小区 为同一个小区， 以快速信道变化的测量值例如 CQI、 PMI和 CSI作为切换信号 质量参考。 此种情况下， 基站可以判断在第一预定时间内， 若目标服务小区 的信道质量高于源服务小区的信道质量， 才向 UE发送 " MAC cont rol PDU" , 通知 UE进行服务小区的动态切换。 也就是说， 网络侧持续地在多个小区同时 发送控制信息， 基站启动定时器， 如果在定时器超时后某一个小区的 PDCCH 信号质量持续好于一定的预置值，此时在高层切换流程例如 RRC信令指示时， 通过 "MAC control PDU" 快速通知 UE服务小区的变化。 在上述实施例过程 中可以建立源服务小区与目标服务小区之间控制信息的转发通道， 即增加建 立源服务小区与目标服务小区的 UE控制信息的转发通道，使得源服务小区与 目标服务小区使用相同的控制信息， 并通过 X2接口在小区间转发控制信息。 该转发通道用于平滑过渡时，源服务小区将其要传送给 UE的控制信息转发给 目标服务小区， 使得目标服务小区可以同时向 UE发送相同的控制信息， 保证 数据不会中断。 该控制信息主要包括， 在 PDCCH上传输的相关信息、 调度信 息等。
在服务小区的动态切换过程中， UE接收到切换指示后， 但尚未返回响应 消息， 此时需要确定是向源服务小区， 还是向目标服务小区返回 "ACK" 或 "NACK" 消息， 本实施例提供一个解决方案。 物理上行控制信道（PUCCH ) 由 发送控制信息的小区重新指配， PUCCH信息可以由单小区或者两个小区同时接 收。 其中指配方式可以包括两种方式： 默认发送方式： 协议中明确规定反馈 所用 PUCCH资源由源服务小区或目标服务小区分配； 或者是显性指示方式： 由 网络侧通过 PDCCH动态指示或 "MAC cont ro l PDU" 或 RRC信令指示。 可选地， UE在返回响应消息时， 则根据与基站预定的发送方式或根据基站的指示， 向 基站内的源服务小区或目标服务小区发送 "ACK" 或 "NACK" 消息。 或者 UE 放弃本次 ACK/NACK反馈，基站认为本次发送为 NACK ,则重新发送" MAC cont ro l PDU" 。
以上实施例提供的服务小区切换指示方法和服务小区切换方法中， 基站 通过新建的 "MAC cont ro l PDU" 及时通知 UE服务小区的变换， 能够缩短服务 小区切换时间， 保证了服务小区的快速切换； 而且切换过程中切换数据不中 断， 实现平滑切换。
图 3为本发明服务小区切换指示方法实施例二流程图， 如图 3所示， 该 方法包括：
步骤 300 , 确定用于为用户设备发送控制信息的目标服务小区；
UE处于无线通信网络中， 基站下的多个小区均可以基于 CoMP技术为该 UE提供控制信息， 当然为了保证控制信息的发送成功率， 基站可以将控制信 息通过信道质量最好的小区发送给 UE。 因此 UE测量各个小区的信道质量信 息， 并上报给基站， 基站接收 UE发送的各个小区的信道质量信息后， 在 CQI 上报集合（也是调度的候选集合） 中选择服务小区。 具体地， 基站内部的调 度器或 RRC或 MAC或高层实体根据 UE上报的信道质量信息确定为 UE提供控 制信息的目标服务小区， 即选择各个小区中信道质量最好的小区作为新的服 务小区为 UE提供控制信息。其中所述的信道质量信息可选地包括信道的快速 信道变化的测量值和 /或慢速信道变化的测量值，其中快速信道变化的测量值 包括 CQI、 PMI和 CS I , 慢速信道变化的测量值包括 RSRP、 RSRQ和 PL。 所述 的测量值既可以包括上行测量结果也可以包括下行测量结果例如 SRS、 PUSCH 信道的测量结果等。
步骤 301 , 生成用于指示所述用户设备从源服务小区切换到所述目标服 务小区的切换指示消息， 所述切换指示消息包括所述目标服务小区的索引或 小区标 i只；
步骤 302 , 通过物理层控制信道向所述用户设备发送所述切换指示消息。 基站在选取好目标服务小区后， 需要将选择的目标服务小区及时通知给 UE , 本实施例中基站通过物理层控制信道， 例如 PDCCH通知 UE。 具体地， 基 站在物理层控制信道中向 UE发送切换指示消息，并携带目标服务小区的索引 或小区标识。 其中所述的目标服务小区的索引可以预先通过高层信令半静态 的通知 UE候选小区的索引值。 UE接收到通过物理层控制信道发送的切换指 示消息后， 可以立即切换到目标服务小区接收控制信息。
本实施例提供的服务小区切换指示方法， 与 "MAC cont ro l PDU" 的通知 方式过程相似， 所不同的是该方法中基站不需要 ACK确认， 而是通过 PDCCH 自身信道设计保证。本实施例通过物理层控制信道快速通知 UE目标服务小区 的切换， 能够缩短服务小区切换时间， 保证了服务小区的动态切换； 而且切 换过程中切换数据不中断， 实现平滑切换。
图 4为本发明服务小区切换方法实施例二流程图， 如图 4所述， 该方法 包括：
步骤 400 , 接收网络侧通过物理层控制信道发送的用于指示所述用户设 备从源服务小区切换到所述目标服务小区的切换指示消息， 所述切换指示消 息包括所述目标服务小区的索引或小区标识；
UE测量各个小区的信道质量信息， 并上报给基站， 基站接收 UE发送的 各个小区的信道质量信息后， 动态地选择服务小区； 并通过物理层控制信道 向 UE 发送切换指示消息， 其中携带有目标服务小区的索引或小区标识。 UE 接收切换指示消息。
步骤 401 , 通过与所述索引或小区标识对应的目标服务小区接收控制信息。 UE在接收到基站通过物理层控制信道发送的切换指示消息后， 根据其携 带的目标服务小区的索引或小区标识， 通过目标服务小区接收基站下发的控 制信息。
本实施例提供的服务小区切换方法中， UE通过物理层控制信道快速获知 切换信息并及时进行服务小区的切换， 不但可以缩短服务小区切换时间， 保 证了服务小区的动态切换； 而且切换过程中切换数据不中断， 实现平滑切换。 第一种情况， 可以认为高层控制小区与物理层发送控制信息的服务小区 ( serving cel l ) 既念不同：
高层控制小区： 管理高层相关算法与功能， 例如 RRM、 Sl、 RB管理等。 可以是一个协作小区集合 ( CoMP set )形成的逻辑虚小区 ( Vi r tua l cel l ) , 也可以是 R8传统小区。 以慢速信道变化的测量值例如 RSRP、 RSRQ、 PL作为 切换信号质量参考， 切换过程是半静态变化的。
服务小区 （serv ing cel l ) ： 发送控制信息的小区， 以快速信道变化的 测量值例如 CQI、 PMI和 CS I作为切换信号质量参考， 可以是动态变化的。
第二种情况， 可以认为高层控制小区与物理层发送控制信息的服务小区 为同一个小区， 以慢速信道变化的测量值例如 RSRP、 RSRQ、 PL作为切换信号 质量参考， 切换过程是半静态变化的。
第三种情况， 可以认为高层控制小区与物理层发送控制信息的服务小区 为同一个小区， 以快速信道变化的测量值例如 CQI、 PMI和 CSI作为切换信号 质量参考。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： R0M、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
图 5为本发明基站实施例一结构示意图， 如图 5所述， 该基站包括第一 确定模块 11、 第一生成模块 12和第一发送模块 13 , 其中第一确定模块 11用 于确定用于为 UE发送控制信息的目标服务小区； 第一生成模块 12用于生成 用于指示 UE从源服务小区切换到目标服务小区的 "MAC control PDU" , 其 中包括目标服务小区的索引或小区标识； 第一发送模块 13用于向 UE发送该 "MAC cont rol PDU" 。
具体地， CoMP UE 处于无线通信网络中， 为了保证控制信息的发送成功 率， 基站需要将控制信息通过信道质量最好的小区发送给 UE。 因此 UE测量 各个小区的信道质量信息， 并上报给基站， 基站中的第一确定模块 11 接收 UE发送的各个小区的信道质量信息后， 动态地选择服务小区。 具体地， 基站 根据 UE上报的信道质量信息确定为 UE提供控制信息的目标服务小区， 即选 择各个小区中信道质量最好的小区作为新的服务小区为 UE提供控制信息。其 中所述的信道质量信息可以包括信道的快速信道变化的测量值和 /或慢速信 道变化的测量值。 第一确定模块 11选取好目标服务小区后， 通过第一生成模 块 12根据目标服务小区的索引或小区标识生成 MAC控制分组数据单元信息即 "MAC control PDU" 。 然后， 通过第一发送模块 13将第一生成模块 12生成 的 "MAC control PDU" 发送给 UE。 第一发送模块 13还可以在第一预定时间 内，若目标服务小区的信道质量高于源服务小区的信道质量，向 UE发送 "MAC control PDU" 。 当然， 第一生成模块 12也可以将 "MAC control PDU" 与其 他控制信息一起封装成 "MAC PDU" , 并由第一发送模块 13发送给 UE。
本实施例提供的基站中还可以包括第一处理模块 14 , 第一处理模块 14 具体用于若接收到 UE发送的 "ACK" 消息， 则通过目标服务小区发送所述控 制信息。 或者用于在等待第二预定时间后， 同时通过源服务小区和目标服务 小区发送所述控制信息， 并在接收到 UE发送的 "ACK" 消息后， 停止通过源 服务小区发送控制信息。 或者用于若接收到 UE发送的 "NACK" 消息， 则指示 第一发送模块 1 3重新向 UE发送包括目标服务小区的索引或小区标识的 "MAC cont ro l PDU" 。
另外， 第一发送模块 1 3还用于在第一预定时间内， 若目标服务小区的信 道质量高于源服务小区的信道质量， 则向 UE发送 "MAC cont ro l PDU" 。
基站中还包括用于指示 UE 向源服务小区还是向目标服务小区发送确认 响应信息或失败响应信息的第一指示模块 15 , 第一指示模块 15 可以通过 PDCCH动态指示或 "MAC cont ro l PDU" 或 RRC信令指示等方式指示， UE可以 根据基站的指示或默认设置向规定的小区返回响应信息。
本实施例提供的基站通过增加一种用于指示 UE 进行服务小区切换的新 的 "MAC cont ro l PDU" , 快速通知 UE 目标服务小区的切换， 能够缩短服务 小区切换时间， 保证了服务小区的动态切换； 而且切换过程中切换数据不中 断， 实现平滑切换。
图 6为本发明用户设备实施例一结构示意图， 如图 6所述， 该 UE包括第 一获取模块 21和第一接收模块 22 , 其中第一获取模块 21用于获取网络侧发 送的用于指示 UE从源服务小区切换到目标服务小区的 "MAC cont ro l PDU" ； 第一接收模块 22 用于通过与索引或小区标识对应的目标服务小区接收控制 信息。
具体地， UE测量各个小区的信道质量信息， 并上报给基站， 基站接收 UE 发送的各个小区的信道质量信息后， 动态地选择服务小区； 并生成用于指示 UE 从源服务小区切换到目标服务小区的 "MAC cont ro l PDU" , 其中携带有 目标服务小区的索引或小区标识。 UE中的第一获取模块 21接收并解析该 "MAC cont ro l PDU" , 若成功获取到目标服务小区的索引或小区标识， 则第一接收 模块 22向基站返回 "ACK" 消息， 并通过与索引或小区标识对应的目标服务 小区接收控制信息。 当然， 第一接收模块 22在目标服务小区上接收控制信道 信息， 可以立即启动， 也可以是在等待第三预定时间后启动。
另外，第一接收模块 22还用于在通过与索引或小区标识对应的目标服务 小区接收控制信息的同时， 通过源服务小区接收控制信息。 本实施例提供的 UE还包括第三发送模块 23 ,用于根据与基站预定的发送方式或根据基站的指 示， 向基站内的源服务小区或目标服务小区返回 "ACK" 或 "NACK" 消息。 所 述预定的发送方式即为默认发送方式： 协议中明确规定反馈所用 PUCCH资源 由源服务小区或目标服务小区分配。 基站的指示包括基站通过 PDCCH动态指 示或 "MAC cont ro l PDU" 或 RRC信令指示等。
本实施例提供的用户设备通过接收基站新建的 "MAC cont ro l PDU" 及时 获知服务小区的变换， 能够缩短服务小区切换时间， 保证了服务小区的动态 切换； 而且切换过程中切换数据不中断， 实现平滑切换。
图 7为本发明网络***实施例一组成示意图， 如图 7所示， 该网络*** 包括基站 1和用户设备即 UE2 , 其中基站 1用于确定用于为 UE2发送控制信 息的目标服务小区， 向 UE2发送生成的用于指示 UE2从源服务小区切换到目 标服务小区的 "MAC cont ro l PDU" , 携带有目标服务小区的索引或小区标识； UE2用于获取基站 1发送的 "MAC cont ro l PDU" , 并通过与索引或小区标识 对应的目标服务小区接收控制信息。
本实施例提供的网络***中涉及的基站和用户设备可以采用上述实施例 提供的基站和用户设备， 具体结构和功能此处不再贅述。 本实施例提供的网 络***中， 基站通过增加一种用于指示 UE 进行服务小区切换的新的 "MAC cont ro l PDU" , 快速通知 UE 目标服务小区的切换， 能够缩短服务小区切换 时间。
图 8为本发明基站实施例二结构示意图， 如图 8所示， 该基站包括第二 确定模块 31、 第二生成模块 32和第二发送模块 33 , 其中第二确定模块 31用 于确定用于为 UE发送控制信息的目标服务小区； 第二生成模块 32用于生成 用于指示 UE从源服务小区切换到所述目标服务小区的切换指示消息，该切换 指示消息包括所述目标服务小区的索引或小区标识；第二发送模块 33用于通 过物理层控制信道向 UE发送所述切换指示消息。
具体地， CoMP UE 处于无线通信网络中， 为了保证控制信息的发送成功 率， 基站需要将控制信息通过信道质量最好的小区发送给 UE。 因此 UE测量 各个小区的信道质量信息， 并上报给基站， 基站中的第二确定模块 31 接收 UE发送的各个小区的信道质量信息后， 动态地选择服务小区， 即选择各个小 区中信道质量最好的小区作为新的服务小区为 UE提供控制信息。其中所述的 信道质量信息可以包括信道的快速信道变化的测量值和 /或慢速信道变化的 测量值。 第二确定模块 31确定好目标服务小区后， 需要将选择的目标服务小 区及时通知给 UE , 本实施例中基站中的第二发送模块 33在物理层控制信道 中向 UE发送切换指示消息， 并携带目标服务小区的索引或小区标识。 UE接 收到通过物理层控制信道发送的切换指示消息后， 可以立即切换到目标服务 小区接收控制信息。
本实施例提供的基站通过物理层控制信道快速通知 UE 目标服务小区的 切换， 能够缩短服务小区切换时间， 保证了服务小区的动态切换； 而且切换 过程中切换数据不中断， 实现平滑切换。
图 9为本发明用户设备实施例二结构示意图， 如图 9所示， 该 UE包括第 二获取模块 41和第二接收模块 42 , 其中第二获取模块 41用于获取网络侧通 过物理层控制信道发送的用于指示 UE 从源服务小区切换到目标服务小区的 切换指示消息， 该切换指示消息包括目标服务小区的索引或小区标识； 第二 接收模块 42用于通过与索引或小区标识对应的目标服务小区接收控制信息。
具体地， UE测量各个小区的信道质量信息， 并上报给基站， 基站接收 UE 发送的各个小区的信道质量信息后， 动态地选择服务小区； 并通过物理层控 制信道向 UE 发送切换指示消息， 其中携带有目标服务小区的索引或小区标 识。 UE 中的第二获取模块 41通过物理层控制信道接收到切换指示消息后， 由第二接收模块 42 根据切换指示消息携带的目标服务小区的索引或小区标 识， 通过目标服务小区接收基站下发的控制信息。
本实施例提供的 UE 通过物理层控制信道快速获知切换信息并及时进行 服务小区的切换， 不但可以缩短服务小区切换时间， 保证了服务小区的动态 切换； 而且切换过程中切换数据不中断， 实现平滑切换。
图 10为本发明网络***实施例二组成示意图， 如图 10所示， 该网络系 统包括基站 3和用户设备即 UE4 , 其中基站 3用于确定用于为 UE4发送控制 信息的目标服务小区， 并通过物理层控制信道向 UE4发送用于指示 UE4从源 服务小区切换到目标服务小区的切换指示消息， 该切换指示消息包括目标服 务小区的索引或小区标识； UE4用于获取基站 3发送的切换指示消息， 并通 过与索引或小区标识对应的目标服务小区接收控制信息。
本实施例提供的网络***中涉及的基站和用户设备可以采用上述实施例 提供的基站和用户设备， 具体结构和功能此处不再贅述。 本实施例提供的网 络***中， 基站通过物理层控制信道快速地通知 UE目标服务小区的切换， 能 够缩短服务小区切换时间。
上述实施例中小区实现的功能还可以由 AP完成， 这里 AP和传统意义上 的小区（ce l l )的关系可以是一个小区包含一个 AP ,或一个小区包含多个 AP , 上述实施例可以看作一个小区只包含一个 AP的例子，即小区与 AP——对应； 显然， 在一个小区包含多个 AP时， 每个 AP可以相当于一个协作小区， 也能 实现本发明实施例。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求 书
1、 一种服务小区切换指示方法， 其特征在于， 包括：
确定用于为用户设备发送控制信息的目标服务小区；
生成用于指示所述用户设备从源服务小区切换到所述目标服务小区的介 质访问控制子层控制分组数据单元信息 , 所述介质访问控制子层控制分组数 据单元信息包括所述目标服务小区的索引或小区标识；
向所述用户设备发送所述介质访问控制子层控制分组数据单元信息。
2、 根据权利要求 1所述的服务小区切换指示方法， 其特征在于， 所述确 定用于为用户设备发送控制信息的目标服务小区包括：
根据所述用户设备发送的各小区的信道质量信息， 确定用于为所述用户 设备发送控制信息的目标服务小区， 所述信道质量信息包括信道的快速信道 变化的测量值和 /或慢速信道变化的测量值。
3、 根据权利要求 1所述的服务小区切换指示方法， 其特征在于， 所述向 所述用户设备发送所述介质访问控制子层控制分组数据单元信息具体为： 通过混合自动重传请求进程， 向所述用户设备发送所述介质访问控制子 层控制分组数据单元信息。
4、 根据权利要求 1所述的服务小区切换指示方法， 其特征在于， 所述向 所述用户设备发送所述介质访问控制子层控制分组数据单元信息包括：
若在第一预定时间内， 所述目标服务小区的信道质量高于所述源服务小 区的信道质量， 则向所述用户设备发送所述介质访问控制子层控制分组数据 单元信息。
5、根据权利要求 1至 4任一所述的服务小区切换指示方法，其特征在于， 所述方法还包括：
若接收到所述用户设备发送的确认响应信息， 则仅通过所述目标服务小 区发送所述控制信息。
6、根据权利要求 1至 4任一所述的服务小区切换指示方法，其特征在于， 所述向所述用户设备发送所述介质访问控制子层控制分组数据单元信息之后 还包括：
在等待第二预定时间后， 同时通过源服务小区和所述目标服务小区发送 所述控制信息， 并在接收到所述用户设备发送的确认响应信息后， 停止通过 所述源服务小区发送所述控制信息。
7、根据权利要求 1至 4任一所述的服务小区切换指示方法，其特征在于， 所述方法还包括：
若接收到所述用户设备发送的失败响应信息， 则重新向所述用户设备发 送所述介质访问控制子层控制分组数据单元信息。
8、 根据权利要求 6所述的服务小区切换指示方法， 其特征在于， 所述方 法还包括： 建立所述源服务小区与所述目标服务小区之间转发通道， 用于在 所述源服务小区和所述目标服务小区间传送所述控制信息。
9、 一种服务小区切换指示方法， 其特征在于， 包括：
确定用于为用户设备发送控制信息的目标服务小区；
生成用于指示所述用户设备从源服务小区切换到所述目标服务小区的切 换指示消息， 所述切换指示消息包括所述目标服务小区的索引或小区标识； 通过物理层控制信道向所述用户设备发送所述切换指示消息。
10、 根据权利要求 9所述的服务小区切换指示方法， 其特征在于， 所述 确定用于为用户设备发送控制信息的目标服务小区包括：
根据所述用户设备发送的各小区的信道质量信息， 确定用于为所述用户 设备发送控制信息的目标服务小区， 所述信道质量信息包括信道的快速信道 变化的测量值和 /或慢速信道变化的测量值。
1 1、 一种服务小区切换方法， 其特征在于， 包括：
获取网络侧发送的用于指示用户设备从源服务小区切换到目标服务小区 的介质访问控制子层控制分组数据单元信息 , 所述介质访问控制子层控制分 组数据单元信息包括所述目标服务小区的索引或小区标识； 通过与所述索引或小区标识对应的目标服务小区接收控制信息。
12、 根据权利要求 11所述的服务小区切换方法， 其特征在于， 所述通过 与所述索引或小区标识对应的目标服务小区接收控制信息包括：
在成功获取所述目标服务小区的索引或小区标识后，返回确认响应信息， 并立即或在等待第三预定时间后， 通过与所述索引或小区标识对应的目标服 务小区接收控制信息。
13、 根据权利要求 11或 12所述的服务小区切换方法， 其特征在于， 所 述通过与所述索引或小区标识对应的目标服务小区接收控制信息的同时， 还 通过所述源服务小区接收所述控制信息。
14、 根据权利要求 13所述的服务小区切换方法， 其特征在于， 所述方法 还包括：
若所述目标服务小区的信道质量高于所述源服务小区的信道质量的时间 长于第四预定时间， 则仅通过所述目标服务小区接收所述控制信息； 或
若通过所述目标服务小区接收到网络侧发送的数据信息， 则仅通过所述 目标服务小区接收所述控制信息； 或
若在第五预定时间内没有通过所述源服务小区接收到控制信息， 则仅通 过所述目标服务小区接收所述控制信息。
15、 根据权利要求 12所述的服务小区切换方法， 其特征在于， 所述方法 还包括：
若没有成功获取所述目标服务小区的索引或小区标识， 则返回失败响应 信息或不作响应。
16、 根据权利要求 15所述的服务小区切换方法， 其特征在于：
所述返回确认响应信息或所述返回失败响应信息具体为根据预定的发送 方式或网络侧指示， 向所述源服务小区或所述目标服务小区返回所述确认响 应信息或所述失败响应信息。
17、 一种服务小区切换方法， 其特征在于， 包括： 接收网络侧通过物理层控制信道发送的用于指示所述用户设备从源服务 小区切换到所述目标服务小区的切换指示消息， 所述切换指示消息包括所述 目标服务小区的索引或小区标识；
通过与所述索引或小区标识对应的目标服务小区接收控制信息。
18、 一种基站， 其特征在于， 包括：
第一确定模块，用于确定用于为用户设备发送控制信息的目标服务小区； 第一生成模块， 用于生成用于指示所述用户设备从源服务小区切换到所 述目标服务小区的介质访问控制子层控制分组数据单元信息， 所述介质访问 控制子层控制分组数据单元信息包括所述目标服务小区的索引或小区标识； 第一发送模块， 用于向所述用户设备发送所述介质访问控制子层控制分 组数据单元信息。
19、 根据权利要求 18所述的基站， 其特征在于， 还包括第一处理模块， 所述第一处理模块用于：
若接收到所述用户设备发送的确认响应信息， 则通过所述目标服务小区 发送所述控制信息； 或者
在等待第二预定时间后， 同时通过源服务小区和所述目标服务小区发送 所述控制信息， 并在接收到所述用户设备发送的确认响应信息后， 停止通过 所述源服务小区发送所述控制信息； 或者
若接收到所述用户设备发送的失败响应信息， 则指示所述第一发送模块 重新向所述用户设备发送所述介质访问控制子层控制分组数据单元信息。
20、 根据权利要求 19所述的基站， 其特征在于， 所述第一发送模块还用 于在第一预定时间内， 若所述目标服务小区的信道质量高于所述源服务小区 的信道质量， 则向所述用户设备发送所述介质访问控制子层控制分组数据单 元信息。
21、 根据权利要求 20所述的基站， 其特征在于， 还包括：
第一指示模块， 用于指示所述用户设备向所述源服务小区或所述目标服 务小区发送确认响应信息或失败响应信息。
22、 一种基站， 其特征在于， 包括：
第二确定模块，用于确定用于为用户设备发送控制信息的目标服务小区； 第二生成模块， 用于生成用于指示所述用户设备从源服务小区切换到所 述目标服务小区的切换指示消息， 所述切换指示消息包括所述目标服务小区 的索引或小区标识；
第二发送模块， 用于通过物理层控制信道向所述用户设备发送所述切换 指示消息。
23、 一种用户设备， 其特征在于， 包括：
第一获取模块， 用于获取网络侧发送的用于指示用户设备从源服务小区 切换到目标服务小区的介质访问控制子层控制分组数据单元信息， 所述介质 访问控制子层控制分组数据单元信息包括所述目标服务小区的索引或小区标 识；
第一接收模块， 用于通过与所述索引或小区标识对应的目标服务小区接 收控制信息。
24、 根据权利要求 23所述的用户设备， 其特征在于， 第一接收模块还用 于在通过与所述索引或小区标识对应的目标服务小区接收控制信息的同时， 通过所述源服务小区接收所述控制信息。
25、 根据权利要求 23或 24所述的用户设备， 其特征在于， 还包括： 第三发送模块， 用于根据与所述基站预定的发送方式或根据所述基站的 指示， 向所述基站内的所述源服务小区或所述目标服务小区发送确认响应信 息或失败响应信息。
26、 一种用户设备， 其特征在于， 包括：
第二获取模块， 用于获取网络侧通过物理层控制信道发送的用于指示所 述用户设备从源服务小区切换到所述目标服务小区的切换指示消息， 所述切 换指示消息包括所述目标服务小区的索引或小区标识； 第二接收模块， 用于通过与所述索引或小区标识对应的目标服务小区接 收控制信息。
27、 一种网络***， 其特征在于， 包括：
基站， 用于确定用于为所述用户设备发送控制信息的目标服务小区， 向 所述用户设备发送生成的用于指示所述用户设备从源服务小区切换到所述目 标服务小区的介质访问控制子层控制分组数据单元信息， 所述介质访问控制 子层控制分组数据单元信息包括所述目标服务小区的索引或小区标识；
用户设备， 用于获取所述基站发送的用于所述介质访问控制子层控制分 组数据单元信息， 并通过与所述索引或小区标识对应的目标服务小区接收控 制信息。
28、 一种网络***， 其特征在于， 包括：
基站， 用于确定用于为所述用户设备发送控制信息的目标服务小区， 并 通过物理层控制信道向所述用户设备发送用于指示所述用户设备从源服务小 区切换到所述目标服务小区的切换指示消息， 所述切换指示消息包括所述目 标服务小区的索引或小区标识；
用户设备， 用于获取所述基站发送的所述切换指示消息， 并通过与所述 索引或小区标识对应的目标服务小区接收控制信息。
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