WO2020047696A1 - 小区切换方法及装置 - Google Patents

小区切换方法及装置 Download PDF

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Publication number
WO2020047696A1
WO2020047696A1 PCT/CN2018/103771 CN2018103771W WO2020047696A1 WO 2020047696 A1 WO2020047696 A1 WO 2020047696A1 CN 2018103771 W CN2018103771 W CN 2018103771W WO 2020047696 A1 WO2020047696 A1 WO 2020047696A1
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WO
WIPO (PCT)
Prior art keywords
base station
cell
candidate base
handover
terminal
Prior art date
Application number
PCT/CN2018/103771
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English (en)
French (fr)
Inventor
杨星
江小威
Original Assignee
北京小米移动软件有限公司
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.)
Filing date
Publication date
Application filed by 北京小米移动软件有限公司 filed Critical 北京小米移动软件有限公司
Priority to PCT/CN2018/103771 priority Critical patent/WO2020047696A1/zh
Priority to CN201880001861.8A priority patent/CN109196909B/zh
Priority to CN202111108429.9A priority patent/CN113873607B/zh
Publication of WO2020047696A1 publication Critical patent/WO2020047696A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • 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
    • H04W36/08—Reselecting an access point

Definitions

  • the present disclosure relates to the field of communications, and in particular, to a cell switching method and device.
  • FIG. 1 a process in which a terminal performs cell switching is shown in FIG. 1.
  • the terminal reports a measurement report to the source base station to which the terminal currently accesses, and the source base station determines whether the terminal needs to perform cell switching according to the measurement report. If the source base station determines that the terminal needs to perform a cell handover, the source base station sends a handover request to multiple candidate base stations. After the multiple base stations have confirmed the completion, the source base station sends a cell handover command message to the terminal.
  • the command message carries the configuration information of the target cell covered by the multiple candidate base stations.
  • the terminal After receiving the cell handover command message, the terminal starts a timer, and the RRC (Radio Resource Control) layer generates a reconfiguration completion message and sends it to the PDCP (Packet Data Convergence Protocol) layer to trigger the MAC ( Media Access Control) initiates a random access process to the target cell, stops the timer after random access is successful, and then continues the subsequent handover process.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • MAC Media Access Control
  • the terminal If the random access process is not successful when the timer expires, that is, the terminal has not received the scheduling information of the PDCCH (Physical Downlink Control Channel) corresponding to the terminal sent by the target cell, the terminal considers The handover fails. At this time, the terminal initiates the cell rebuilding process. However, the cell reconstruction will cause a large delay.
  • PDCCH Physical Downlink Control Channel
  • embodiments of the present disclosure provide a cell switching method and device.
  • a cell switching method is provided.
  • the method is used for a terminal.
  • the method includes:
  • the UE switches to a cell covered by the second candidate base station.
  • the method further includes:
  • the method further includes:
  • one candidate base station in which the reference signal quality of the multiple candidate base stations meets a preset cell selection condition is used as the first base station An alternative base station;
  • the determining a second candidate base station includes:
  • One candidate base station among the plurality of candidate base stations that has not received a cell reconfiguration complete message sent by the terminal and whose reference signal quality meets a preset cell selection condition is used as the second candidate base station.
  • the method further includes:
  • the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is not received, repeat the step of determining the second candidate base station, and then send the second candidate base station to the second candidate base station.
  • the base station sends a cell reconfiguration complete message until it successfully switches to a cell covered by the second candidate base station.
  • the cell handover command message carries a handover parameter;
  • the handover parameter includes any one of a handover timer parameter and a handover counter parameter;
  • the handover timer parameter is used to indicate a valid duration of the cell handover performed by the terminal
  • the handover counter parameter is used to indicate a maximum value of the number of cell handovers performed by the terminal in total.
  • the method further includes:
  • the cell reconstruction process is started.
  • the method further includes:
  • the cell reconstruction process is started.
  • a cell switching device is provided.
  • the device is used for a terminal.
  • the device includes:
  • a first determining module configured to determine a second candidate base station if a handover request from a current cell to a cell covered by the first candidate base station fails
  • a first sending module configured to send a cell reconfiguration complete message to the second candidate base station
  • the first handover module is configured to switch to a cell covered by the second candidate base station if scheduling information of a physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is received.
  • the apparatus further includes:
  • the execution module is configured to discard the currently stored data unit corresponding to the PDCP layer of the packet data convergence protocol, and decrement the sending sequence number of the data unit corresponding to the PDCP layer by one.
  • the apparatus further includes:
  • a second sending module configured to send a measurement report to a currently accessed source base station, where the measurement report is used by the source base station to determine whether the terminal needs to perform a cell handover;
  • a second determining module is configured to, if a cell handover command message carrying a plurality of candidate base stations returned by the source base station is received, determine whether the reference signal quality in the plurality of candidate base stations meets a preset cell selection condition.
  • One candidate base station as the first candidate base station;
  • a second handover module is configured to request a handover from a current cell to a cell covered by the first candidate base station.
  • the first determining module includes:
  • a determining submodule configured to use, as the first base station among the plurality of candidate base stations, a candidate base station that does not receive a cell reconfiguration complete message sent by the terminal and whose reference signal quality meets a preset cell selection condition; Two alternative base stations.
  • the apparatus further includes:
  • a control module configured to control the first determining module to repeat the determining the second candidate base station if the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is not received; And after that, control the first sending module to send a cell reconfiguration completion message to the second candidate base station until it successfully switches to a cell covered by the second candidate base station.
  • the cell handover command message carries a handover parameter;
  • the handover parameter includes any one of a handover timer parameter and a handover counter parameter;
  • the handover timer parameter is used to indicate a valid duration of the cell handover performed by the terminal
  • the handover counter parameter is used to indicate a maximum value of the number of cell handovers performed by the terminal in total.
  • the apparatus further includes:
  • a first startup module configured to, if the duration of the cell handover by the terminal reaches the valid duration indicated by the handover timer parameter, and does not receive the physical response corresponding to the terminal returned by the second candidate base station
  • the scheduling information of the downlink control channel PDCCH initiates a cell reconstruction process.
  • the apparatus further includes:
  • a second startup module configured to, if the number of times that the terminal cumulatively performs cell handover reaches the maximum value indicated by the handover counter parameter, and does not receive a physical response corresponding to the terminal returned by the second candidate base station
  • the scheduling information of the downlink control channel PDCCH initiates a cell reconstruction process.
  • a computer-readable storage medium stores a computer program, and the computer program is configured to execute the cell switching method according to the first aspect.
  • a cell switching device includes:
  • Memory for storing processor-executable instructions
  • the processor is configured to:
  • the UE switches to a cell covered by the second candidate base station.
  • the terminal may not perform cell reconstruction, but may determine a second candidate base station and send the cell to the second candidate base station A reconfiguration completion message; if the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is received, it switches to a cell covered by the second candidate base station.
  • the terminal can perform cell switching again after failing to perform cell switching, thereby avoiding a large delay caused by cell reconstruction, and improving terminal performance.
  • the terminal may discard the data unit corresponding to the currently stored packet data convergence protocol PDCP layer, and The transmission sequence number of the unit is decremented by one. Ensuring the accuracy of the terminal's encryption and integrity protection algorithm at the PDCP layer, so that subsequent terminals can send a second cell reconfiguration completion message to the second candidate base station.
  • the terminal may send a measurement report to the source base station, and the source base station determines whether the terminal needs to perform cell switching according to the measurement report. If the terminal receives a cell handover command message carrying multiple candidate base stations returned by the source base station, the terminal may select, from among the multiple candidate base stations, one candidate base station whose reference signal quality satisfies a preset cell selection condition as a first candidate. The base station then requests a handover from the current cell to a cell covered by the first candidate base station. High availability.
  • the terminal when determining the second candidate base station, may select, among multiple candidate base stations provided by the source base station, that the cell reconfiguration completion message sent by the terminal is not received, and the reference signal quality meets a preset One candidate base station of the cell selection condition of the cell serves as the second candidate base station.
  • the terminal may determine the second candidate base station when performing cell switching again according to multiple candidate base stations provided by the source base station, which is simple to implement and has high availability.
  • the terminal may request the handover to the second candidate base station. If the handover fails again, the new second candidate base station may be determined again. , Perform cell handover again until handover to the cell covered by the second candidate base station successfully. Avoiding the large delay caused by the cell reconstruction improves the terminal performance.
  • the source base station may carry a handover parameter when returning a handover command message
  • the handover parameter may be any one of a handover timer parameter and a handover counter parameter.
  • the handover timer parameter is used to indicate the effective duration of the cell handover performed by the terminal; and the handover counter parameter is used to indicate the maximum value of the number of cell handovers performed by the terminal in total.
  • the terminal can control the duration of the cell switchover or the cumulative number of cell switchovers, so that when the cell switchover duration is long or the cumulative number of cell switchovers is large, the cell rebuilding process is started to avoid multiple terminals. Performing cell switching twice causes a large delay. Ensure the normal operation of terminal services.
  • Fig. 1 is a schematic diagram of a cell handover scenario in the related art according to an exemplary embodiment.
  • Fig. 2 is a schematic flowchart of a cell handover method according to an exemplary embodiment.
  • Fig. 3 is a flow chart showing another cell switching method according to an exemplary embodiment.
  • Fig. 4 is a flow chart showing another cell switching method according to an exemplary embodiment.
  • Fig. 5 is a flow chart showing another cell switching method according to an exemplary embodiment.
  • Fig. 6 is a flow chart showing another cell switching method according to an exemplary embodiment.
  • Fig. 7 is a flow chart showing another cell switching method according to an exemplary embodiment.
  • Fig. 8 is a flow chart showing another cell switching method according to an exemplary embodiment.
  • Fig. 9 is a block diagram of a cell switching apparatus according to an exemplary embodiment.
  • Fig. 10 is a block diagram of another cell switching apparatus according to an exemplary embodiment.
  • Fig. 11 is a block diagram of another cell switching apparatus according to an exemplary embodiment.
  • Fig. 12 is a block diagram of another cell switching apparatus according to an exemplary embodiment.
  • Fig. 13 is a block diagram of another cell switching apparatus according to an exemplary embodiment.
  • Fig. 14 is a block diagram of another cell switching apparatus according to an exemplary embodiment.
  • Fig. 15 is a block diagram of another cell switching apparatus according to an exemplary embodiment.
  • Fig. 16 is a schematic structural diagram of another device for cell switching according to an exemplary embodiment of the present disclosure.
  • first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other.
  • first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.
  • word “if” as used herein can be interpreted as “at” or "when” or "in response to determination”.
  • FIG. 2 is a flowchart of a cell handover method according to an exemplary embodiment, which may include the following steps:
  • step 101 if the handover request from the current cell to the cell covered by the first candidate base station fails, determine the second candidate base station;
  • step 102 a cell reconfiguration completion message is sent to the second candidate base station
  • step 103 if the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is received, the UE switches to the cell covered by the second candidate base station.
  • the terminal may not perform cell reconstruction, but may instead determine the second candidate base station, and send the cell relocation to the second candidate base station.
  • a configuration complete message if the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is received, it switches to a cell covered by the second candidate base station.
  • the terminal determines that a cell handover is currently required.
  • the source base station is a base station covering the current cell.
  • the terminal may determine a first candidate base station among the plurality of candidate base stations.
  • a candidate base station whose reference signal quality satisfies a preset cell selection condition may be used as the first candidate base station.
  • the reference signal quality may be characterized by at least one of RSRP (Reference Signal Receiving Power) and RSRQ (Reference Signal Receiving Quality).
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal Receiving Quality
  • the terminal may send a cell reconfiguration completion message to the first candidate base station according to the related technology, and simultaneously start a timer.
  • the timer may be a T304 timer used when the system is switched. If the PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) corresponding to the terminal is still not received when the timer expires, the terminal determines to request from the current cell Handover to a cell covered by the first candidate base station fails.
  • PDCCH Physical Downlink Control Channel, Physical Downlink Control Channel
  • the terminal may not perform cell reconstruction, but may determine a second candidate base station.
  • the terminal may determine a second candidate base station among the multiple candidate base stations returned by the source base station, where the second candidate base station is not received by the multiple candidate base stations.
  • the multiple candidate base stations include base station A, base station B, and base station C.
  • the first candidate base station is base station A.
  • Base station A has received a cell reconfiguration complete message sent by the terminal, and base station B and base station C have not received a cell reconfiguration complete message sent by the terminal.
  • the terminal may select a candidate base station in the base station B and the base station C whose reference signal quality meets a preset cell selection condition, assuming that the base station B is used as the second candidate base station, and the second candidate base station is used as the second base station.
  • the second alternative base station is used.
  • an alternative base station with better reference signal quality may be selected as the first base station. Two alternative base stations.
  • the terminal may send a cell reconfiguration completion message to the second candidate base station according to related technologies.
  • the terminal will start the timer again according to the related technology.
  • the timer may be a T304 timer used when the system is switched.
  • the terminal may perform a cell handover process according to related technologies. Handover to a cell covered by the second candidate base station.
  • the terminal may perform cell switching again after failing to perform cell switching, thereby avoiding a large time delay caused by cell reconstruction, and improving terminal performance.
  • FIG. 3 is a flowchart of another cell handover method according to the embodiment shown in FIG. 2. If a request to switch from a current cell to a cell covered by a first candidate base station fails, The cell handover method may further include the following steps:
  • step 104 the currently stored data unit corresponding to the PDCP layer of the packet data convergence protocol is discarded, and the sending sequence number of the data unit corresponding to the PDCP layer is decremented by one.
  • the terminal after receiving the cell switching command message sent by the source base station, the terminal updates its encryption and integrity protection algorithm and key of the PDCP layer.
  • the PDCP layer After the PDCP layer receives the reconfiguration completion message generated by the RRC layer, Follow-up processing based on new encryption and integrity protection algorithms.
  • the input parameters corresponding to the encryption and integrity protection algorithms include: DIRECTION, BEARER, and COUNT.
  • DIRECTION is used to indicate the data transmission direction
  • BEARER is used to indicate the wireless bearer identification of the terminal
  • COUNT is a counter, which is composed of HFN (HyperFrameNumber, superpolar frame number) and the serial number sent by the PDCP layer.
  • HFN HydroFrameNumber, superpolar frame number
  • Each PDCP layer transmits a corresponding PDCP.
  • a data unit the transmission sequence number plus one.
  • the sending sequence number of the data unit corresponding to the PDCP layer has been increased by one.
  • the currently stored data unit corresponding to the PDCP layer of the packet data convergence protocol may be discarded, and the sending sequence number of the data unit corresponding to the PDCP layer is decremented by one.
  • the data unit corresponding to the PDCP layer includes a PDU (Protocol Data Unit) and a SDU (service Data Unit).
  • the terminal may send a cell reconfiguration completion message to the second candidate base station. If the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is received, the UE switches to a cell covered by the second candidate base station.
  • the terminal may discard the currently stored data unit corresponding to the PDCP layer of the packet data convergence protocol after failing to switch from the current cell to the cell covered by the first candidate base station, and the data unit corresponding to the PDCP layer Minus one. Ensuring the accuracy of the terminal's encryption and integrity protection algorithm at the PDCP layer, so that subsequent terminals can send the cell reconfiguration complete message to the second candidate base station again.
  • FIG. 4 is a flowchart of another cell handover method according to the embodiment shown in FIG. 2. The method further includes:
  • step 100-1 a measurement report is sent to a currently accessed source base station, where the measurement report is used by the source base station to determine whether the terminal needs to perform a cell handover;
  • the terminal first sends a measurement report to the currently accessed source base station according to the related technology, and the source base station may determine whether the terminal needs to perform cell switching according to the measurement report.
  • step 100-2 if a cell handover command message carrying multiple candidate base stations returned by the source base station is received, one of the reference signal qualities in the multiple candidate base stations meets a preset cell selection condition.
  • a candidate base station as the first candidate base station;
  • the source base station determines multiple candidate base stations according to related technologies, and sends a cell handover request to the multiple candidate base stations, and each of the multiple candidate base stations returns a confirmation message to allow the After the terminal performs cell handover, the source base station returns a cell handover command message carrying multiple candidate base stations to the terminal, and the terminal may receive according to related technologies.
  • the terminal may select, from among multiple candidate base stations provided by the source base station, a candidate base station whose reference signal quality satisfies a preset cell selection condition as the first candidate base station.
  • the reference signal quality may be characterized by at least one of RSRP and RSRQ.
  • step 100-3 a handover is requested from the current cell to a cell covered by the first candidate base station.
  • the terminal sends a cell reconfiguration completion message to the first candidate base station, and at the same time, the terminal starts a timer.
  • the timer may be a T304 timer used during system switching. If before the timer expires, the terminal receives the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the first candidate base station, the terminal may continue to execute the cell handover procedure according to the related technology, and switch to the first In a cell covered by an alternative base station.
  • the terminal If the terminal does not receive the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the first candidate base station before the timer expires, the terminal requests a handover from the current cell to a cell covered by the first candidate base station failure. At this time, the terminal may perform the above steps 101 to 103 to switch to a cell covered by the second candidate base station.
  • the terminal may send a measurement report to the source base station, and the source base station determines whether the terminal needs to perform cell switching according to the measurement report. If the terminal receives a cell handover command message carrying multiple candidate base stations returned by the source base station, the terminal may select, from among the multiple candidate base stations, one candidate base station whose reference signal quality meets a preset cell selection condition as a first candidate. The base station then requests a handover from the current cell to a cell covered by the first candidate base station. High availability.
  • the process of determining the second candidate base station in the above step 101 may include: not receiving a cell reconfiguration complete message sent by the terminal from the plurality of candidate base stations, and the reference signal quality meets a preset One candidate base station of the cell selection condition of the cell is used as the second candidate base station.
  • the terminal may determine a second candidate base station among the multiple candidate base stations returned by the source base station, and the second candidate base station is that the terminal is not received by the multiple candidate base stations.
  • the reference signal quality may be characterized by at least one of RSRP and RSRQ.
  • the terminal may send a cell reconfiguration completion message to the second candidate base station, and if a physical downlink corresponding to the terminal is received by the second candidate base station, The scheduling information of the control channel PDCCH is switched to a cell covered by the second candidate base station.
  • FIG. 5 is a flowchart of another cell switching method according to the embodiment shown in FIG. 4.
  • the foregoing cell switching method may further include:
  • step 105 if the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is not received, the step of determining the second candidate base station is repeated, and then to the The second candidate base station sends a cell reconfiguration complete message until it successfully switches to a cell covered by the second candidate base station.
  • the terminal may determine a new second candidate base station again.
  • a candidate base station that does not receive a cell reconfiguration complete message sent by the terminal and whose reference signal quality meets a preset cell selection condition is selected as a new one.
  • the multiple candidate base stations include base station A, base station B, and base station C.
  • the first candidate base station is base station A.
  • Base station A has received a cell reconfiguration complete message sent by the terminal, and base station B and base station C have not received a cell reconfiguration complete message sent by the terminal.
  • the terminal may select a candidate base station in the base station B and the base station C whose reference signal quality satisfies a preset cell selection condition. It is assumed that the base station B is the base station B and the base station B is used as the second candidate base station.
  • the terminal may perform A new second candidate base station is determined again in the base stations. At this time, the base station C may be used as the new second candidate base station.
  • the terminal After determining the new second candidate base station, the terminal sends a cell reconfiguration completion message to the new second candidate base station. If the T304 timer expires, the terminal receives the second candidate base station and the terminal. For the scheduling information of the corresponding physical downlink control channel PDCCH, the terminal may switch to the cell covered by the second candidate base station according to related technologies. If the terminal does not receive the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the new second candidate base station, the foregoing step 101-1 may be repeated again, and then sent to the second candidate base station. The cell reconfiguration complete message until the terminal successfully switches to a cell covered by the second candidate base station.
  • the terminal may request the handover to the second candidate base station. If the handover fails again, the new second candidate base station may be determined again. , Perform cell handover again until handover to the cell covered by the second candidate base station successfully. Avoiding the large delay caused by the cell reconstruction improves the terminal performance.
  • the source base station may carry a handover parameter in a cell handover command message returned to the terminal.
  • the handover parameter includes any one of a handover timer parameter and a handover counter parameter; wherein the handover timer parameter is used to indicate a valid duration of the cell handover by the terminal; the handover counter parameter is used to indicate the handover
  • the terminal accumulates the maximum number of cell handover times.
  • the terminal may control the duration of the cell switching or the cumulative number of cell switching times based on the handover parameter.
  • FIG. 6 is a flowchart of another cell switching method according to the embodiment shown in FIG. 5.
  • the foregoing cell switching method may further include:
  • step 106 if the duration of the cell handover by the terminal reaches the valid duration indicated by the handover timer parameter, and the physical downlink control channel corresponding to the terminal returned by the second candidate base station is not received.
  • the scheduling information of the PDCCH initiates a cell reconstruction process.
  • the terminal may start a handover timer when the handover request from the current cell to the cell covered by the first candidate base station fails, and the duration of the handover timer is the valid duration indicated by the handover timer parameter.
  • the terminal sends a cell reconfiguration complete message to the second candidate base station. If the handover timer expires, the terminal has not received the scheduling of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station. Information, the terminal can stop cell switching and start the cell rebuilding process according to the related technology.
  • the terminal may start the handover timer when requesting the handover from the current cell to the cell covered by the first candidate base station. If the terminal fails to request handover from the current cell to the cell covered by the first candidate base station, the terminal sends The second candidate base station sends a cell reconfiguration complete message. When the handover timer expires, if the terminal has not received the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station, Then, the terminal can stop cell switching and start a cell rebuilding process according to the related technology.
  • FIG. 7 is a flowchart of another cell switching method according to the embodiment shown in FIG. 5.
  • the above cell switching method may further include:
  • step 107 if the total number of cell handovers performed by the terminal reaches the maximum value indicated by the handover counter parameter, and the physical downlink control channel corresponding to the terminal returned by the second candidate base station is not received.
  • the scheduling information of the PDCCH initiates a cell reconstruction process.
  • the terminal may start a handover counter after the request to switch from the current cell to the cell covered by the first candidate base station fails, and the initial value of the handover counter is zero.
  • the terminal sends a cell reconfiguration complete message to the second candidate base station, the terminal increases the value of the handover counter by one. If the cumulative number of cell handovers performed by the terminal reaches the maximum value indicated by the handover counter parameter, that is, the number of times counted by the handover counter reaches the maximum value,
  • the terminal can stop cell switching and start a cell reconstruction process according to related technologies.
  • the terminal may start the handover counter when requesting a handover from a current cell to a cell covered by a first candidate base station, and an initial value of the handover counter is zero. If the terminal fails to request a handover from the current cell to the cell covered by the first candidate base station, the value of the handover counter is increased by one. Each time the terminal sends a cell reconfiguration complete message to the second candidate base station, the value of the handover counter is also increased by one. The number of cumulative cell handovers at the terminal reaches the maximum value indicated by the handover counter parameter, that is, the number of times counted by the handover counter reaches the maximum value, and the terminal has not received the AND returned by the second candidate base station. For the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal, the terminal can stop cell switching and start a cell reconstruction process according to related technologies.
  • the source base station may carry a handover parameter when returning a handover command message
  • the handover parameter may be any one of a handover timer parameter and a handover counter parameter.
  • the handover timer parameter is used to indicate the effective duration of the cell handover performed by the terminal; and the handover counter parameter is used to indicate the maximum value of the number of cell handovers performed by the terminal in total.
  • the terminal can control the duration of the cell switchover or the cumulative number of cell switchovers, so that when the cell switchover duration is long or the cumulative cell switchover times are large, the cell rebuilding process is started to avoid the terminal Performing cell switching twice causes a large delay. Ensure the normal operation of terminal services.
  • FIG. 8 is a flowchart of another cell switching method according to an embodiment.
  • the cell switching method may include:
  • step 201 the terminal sends a measurement report to the currently accessed source base station
  • the measurement report is used by the source base station to determine whether the terminal needs to perform cell switching.
  • step 202 a cell handover command message carrying multiple candidate base stations and handover parameters returned by the source base station to the terminal.
  • the source base station determines that the terminal needs to perform a cell handover, and then the source base station sends a handover request to multiple second candidate base stations. After the multiple second candidate base stations confirm the completion, the source base station sends a cell handover command message to Said terminal (not shown in FIG. 8), the cell switching command message carries configuration information of a target cell covered by each of the plurality of second candidate base stations.
  • the handover parameter includes any one of a handover timer parameter and a handover counter parameter; wherein the handover timer parameter is used to indicate a valid duration of the cell handover by the terminal; the handover counter parameter is used to indicate the handover The terminal accumulates the maximum number of cell handover times.
  • step 203 the terminal determines a first candidate base station among a plurality of candidate base stations.
  • step 204 the terminal sends a cell reconfiguration completion message to the first candidate base station.
  • step 205 after the terminal fails to request the handover from the current cell to the cell covered by the first candidate base station, it determines the second candidate base station.
  • the terminal uses, as the second backup, a candidate base station among the multiple candidate base stations that does not receive a cell reconfiguration complete message sent by the terminal and whose reference signal quality meets a preset cell selection condition. Choose a base station.
  • step 206 the terminal sends a cell reconfiguration completion message to the second candidate base station.
  • step 207 if the terminal does not receive the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station, the above steps 205 to 206 are repeated.
  • step 208 if the terminal receives the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station, the terminal switches to a cell covered by the second candidate base station.
  • step 209 if the duration of the cell handover by the terminal reaches the valid duration indicated by the handover timer parameter or the number of cell handovers cumulatively performed by the terminal reaches the maximum value indicated by the handover counter parameter, and After receiving the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station, a cell reconstruction process is started.
  • Example 1 When a terminal receives a cell handover command message sent by a source base station, the cell handover command message carries multiple candidate base stations including base station A, base station B, and base station C, and the cell handover command message carries a handover timer parameter T. After the terminal sends a cell reconfiguration complete message to the base station A for the cell switching failure, the terminal discards the currently stored data units corresponding to the PDCP layer, including PDUs and SDUs, and decrements the sending sequence number of the data unit corresponding to the PDCP layer by one, and starts Switchover timer. The duration of the switchover timer is T.
  • the terminal measures the base station B and the base station C. If the reference signal quality of the base station B meets a preset cell selection condition, the terminal sends a cell reconfiguration completion message to the base station B. If the terminal fails to switch cells again, at this time, the terminal discards the currently stored data units corresponding to the PDCP layer, including PDUs and SDUs, and decreases the sending sequence number of the data units corresponding to the PDCP layer by one.
  • the terminal sends a cell reconfiguration completion message to the base station C.
  • the handover timer is stopped. If the handover timer expires, the terminal starts a cell re-establishment process.
  • Example 2 When a terminal receives a cell handover command message sent by a source base station, the cell handover command message carries multiple candidate base stations including base station A, base station B, and base station C, and the cell handover command message carries a handover counter parameter CT. After the terminal sends a cell reconfiguration complete message to the base station A for the cell switching failure, the terminal discards the currently stored data units corresponding to the PDCP layer, including PDUs and SDUs, and decrements the sequence number of the data units corresponding to the PDCP layer by one. Each time a cell handover is initiated, the number of cell handovers performed by the terminal is increased by one.
  • the terminal measures the base station B and the base station C. If the reference signal quality of the base station B meets a preset cell selection condition, the terminal sends a cell reconfiguration completion message to the base station B. If the terminal fails to switch cells again, at this time, the terminal discards the currently stored data units corresponding to the PDCP layer, including PDUs and SDUs, and decreases the sending sequence number of the data units corresponding to the PDCP layer by one. And the number of times that the terminal cumulatively performs cell handover is increased by one.
  • the terminal sends a cell reconfiguration completion message to the base station C.
  • the terminal stops accumulating the cumulative number of times that the terminal performs cell handover. If the total number of times that the terminal performs cell handover reaches the maximum number, the terminal starts a cell reconstruction process.
  • the terminal may perform cell switching again after failing to perform cell switching, thereby avoiding a large time delay caused by cell reconstruction, and improving terminal performance.
  • the terminal can control the duration of the cell handover or the cumulative number of cell handovers, so that the cell rebuilds when the cell handover time is long or the cumulative handover times are large to avoid the terminal from repeatedly Performing cell switching causes a large delay. Ensure the normal operation of terminal services.
  • the present disclosure also provides embodiments of an application function implementation device and a corresponding terminal.
  • FIG. 9 is a block diagram of a cell switching apparatus according to an exemplary embodiment.
  • the apparatus is used for a terminal, and the apparatus includes:
  • the first determining module 310 is configured to determine a second candidate base station if the handover request from the current cell to a cell covered by the first candidate base station fails;
  • a first sending module 320 configured to send a cell reconfiguration complete message to the second candidate base station
  • the first handover module 330 is configured to switch to a cell covered by the second candidate base station if scheduling information of a physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is received. .
  • FIG. 10 is a block diagram of another cell handover apparatus according to the embodiment shown in FIG. 9, and the apparatus further includes:
  • the execution module 340 is configured to discard the currently stored data unit corresponding to the PDCP layer of the packet data convergence protocol, and decrement the sending sequence number of the data unit corresponding to the PDCP layer by one.
  • FIG. 11 is a block diagram of another cell handover apparatus according to the embodiment shown in FIG. 9, and the apparatus further includes:
  • the second sending module 350 is configured to send a measurement report to the currently accessed source base station, where the measurement report is used by the source base station to determine whether the terminal needs to perform cell switching;
  • the second determining module 360 is configured to, if a cell switching command message carrying multiple candidate base stations returned by the source base station is received, the reference signal quality in the multiple candidate base stations meets a preset cell selection condition.
  • One candidate base station as the first candidate base station;
  • the second handover module 370 is configured to request a handover from a current cell to a cell covered by the first candidate base station.
  • FIG. 12 is a block diagram of another cell switching apparatus shown on the basis of the embodiment shown in FIG. 11.
  • the first determining module 310 includes:
  • a determining submodule 311, configured to use, as the candidate base station, a candidate base station among the multiple candidate base stations that does not receive a cell reconfiguration complete message sent by the terminal and whose reference signal quality meets a preset cell selection condition The second alternative base station.
  • FIG. 13 is a block diagram of another cell handover apparatus according to the embodiment shown in FIG. 12, and the apparatus further includes:
  • the control module 380 is configured to control the first determination module 310 to repeat the determination of the second backup if the scheduling information of the physical downlink control channel PDCCH corresponding to the terminal returned by the second candidate base station is not received. Select a base station, and then control the first sending module 320 to send a cell reconfiguration completion message to the second candidate base station until it successfully switches to a cell covered by the second candidate base station.
  • the cell handover command message carries a handover parameter;
  • the handover parameter includes any one of a handover timer parameter and a handover counter parameter;
  • the handover timer parameter is used to indicate a valid duration of the cell handover performed by the terminal
  • the handover counter parameter is used to indicate a maximum value of the number of cell handovers performed by the terminal in total.
  • FIG. 14 is a block diagram of another cell switching device shown on the basis of the embodiment shown in FIG. 13, and the device further includes:
  • the first startup module 410 is configured to: if the duration of the cell handover by the terminal reaches the valid duration indicated by the handover timer parameter, and does not receive the response corresponding to the terminal returned by the second candidate base station.
  • the scheduling information of the physical downlink control channel (PDCCH) initiates a cell reconstruction process.
  • FIG. 15 is a block diagram of another cell handover apparatus according to the embodiment shown in FIG. 13, and the apparatus further includes:
  • the second startup module 420 is configured to, if the number of times that the terminal performs a cell handover reaches a maximum value indicated by the handover counter parameter, and does not receive a response from the second candidate base station that corresponds to the terminal,
  • the scheduling information of the physical downlink control channel (PDCCH) initiates a cell reconstruction process.
  • PDCCH physical downlink control channel
  • the relevant part may refer to the description of the method embodiment.
  • the device embodiments described above are only schematic, in which the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, may be located in one Place, or can be distributed across multiple network elements. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solution of the present disclosure. Those of ordinary skill in the art can understand and implement without creative efforts.
  • the present disclosure also provides a computer-readable storage medium storing a computer program for performing the cell switching method described in any one of the above.
  • the present disclosure also provides a cell switching device for a terminal, including:
  • Memory for storing processor-executable instructions
  • the processor is configured to:
  • the UE switches to a cell covered by the second candidate base station.
  • Fig. 16 is a schematic structural diagram of a cell switching device according to an exemplary embodiment.
  • a cell switching device 1600 is shown according to an exemplary embodiment.
  • the device 1600 may be a computer, a mobile phone, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a medical device, or a fitness equipment. Devices, personal digital assistants and other terminals.
  • the device 1600 may include one or more of the following components: a processing component 1601, a memory 1602, a power component 1603, a multimedia component 1604, an audio component 1605, an input / output (I / O) interface 1606, a sensor component 1607, And communication component 1608.
  • a processing component 1601 a memory 1602, a power component 1603, a multimedia component 1604, an audio component 1605, an input / output (I / O) interface 1606, a sensor component 1607, And communication component 1608.
  • the processing component 1601 generally controls overall operations of the device 1600, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations.
  • the processing component 1601 may include one or more processors 1609 to execute instructions to complete all or part of the steps of the method described above.
  • the processing component 1601 may include one or more modules to facilitate interaction between the processing component 1601 and other components.
  • the processing component 1601 may include a multimedia module to facilitate the interaction between the multimedia component 1604 and the processing component 1601.
  • the memory 1602 is configured to store various types of data to support operation at the device 1600. Examples of such data include instructions for any application or method operating on the device 1600, contact data, phone book data, messages, pictures, videos, and the like.
  • the memory 1602 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), Programming read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.
  • SRAM static random access memory
  • EEPROM electrically erasable programmable read-only memory
  • EPROM Programming read-only memory
  • PROM programmable read-only memory
  • ROM read-only memory
  • magnetic memory flash memory
  • flash memory magnetic disk or optical disk.
  • the power supply component 1603 provides power to various components of the device 1600.
  • the power component 1603 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 1600.
  • the multimedia component 1604 includes a screen that provides an output interface between the device 1600 and a user.
  • the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user.
  • the touch panel includes one or more touch sensors to sense touch, swipe, and gestures on the touch panel. The touch sensor may not only sense a boundary of a touch or slide action, but also detect duration and pressure related to the touch or slide operation.
  • the multimedia component 1604 includes a front camera and / or a rear camera. When the device 1600 is in an operation mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each front camera and rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.
  • the audio component 1605 is configured to output and / or input audio signals.
  • the audio component 1605 includes a microphone (MIC) that is configured to receive an external audio signal when the device 1600 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode.
  • the received audio signal may be further stored in the memory 1602 or transmitted via the communication component 1608.
  • the audio component 1605 further includes a speaker for outputting audio signals.
  • the I / O interface 1606 provides an interface between the processing component 1601 and a peripheral interface module.
  • the peripheral interface module may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
  • the sensor assembly 1607 includes one or more sensors for providing status assessment of various aspects of the device 1600.
  • the sensor component 1607 can detect the opening / closing state of the device 1600, and the relative positioning of the components, such as the display and keypad of the device 1600.
  • the sensor component 1607 can also detect the change in the position of the device 1600 or a component of the device 1600 , The presence or absence of the user's contact with the device 1600, the orientation or acceleration / deceleration of the device 1600, and the temperature change of the device 1600.
  • the sensor component 1607 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact.
  • the sensor component 1607 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications.
  • the sensor component 1607 may further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
  • the communication component 1608 is configured to facilitate wired or wireless communication between the device 1600 and other devices.
  • the device 1600 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof.
  • the communication component 1608 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel.
  • the communication component 1608 further includes a near field communication (NFC) module to facilitate short-range communication.
  • the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
  • RFID radio frequency identification
  • IrDA infrared data association
  • UWB ultra wideband
  • Bluetooth Bluetooth
  • the device 1600 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable A gate array (FPGA), controller, microcontroller, microprocessor, or other electronic component is implemented to perform the above method.
  • ASICs application-specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGA field programmable A gate array
  • controller microcontroller, microprocessor, or other electronic component is implemented to perform the above method.
  • a non-transitory computer-readable storage medium including instructions such as a memory 1602 including instructions, may be executed by the processor 1609 of the device 1600 to complete the foregoing method.
  • the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
  • the device 1600 when the instructions in the storage medium are executed by the processor, the device 1600 is enabled to execute any one of the cell switching methods for a terminal side described above.

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Abstract

本公开提供一种小区切换方法及装置，其中，所述方法包括：如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；向所述第二备选基站发送小区重配完成消息；如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。本公开中，终端可以在进行小区切换失败之后，再次进行小区切换，避免进行小区重建所造成的较大时延，提升了终端性能。

Description

小区切换方法及装置 技术领域
本公开涉及通信领域，尤其涉及小区切换方法及装置。
背景技术
相关技术中，终端进行小区切换的过程如图1所示。
终端上报测量报告到所述终端当前接入的源基站，源基站根据测量报告确定所述终端是否需要进行小区切换。如果源基站确定终端需要进行小区切换，则由源基站向多个备选基站发送切换请求，多个备选基站确认完成后，由源基站发送小区切换命令消息给所述终端，所述小区切换命令消息中携带所述多个备选基站各自覆盖的目标小区的配置信息。
终端接收到小区切换命令消息之后，启动定时器，由RRC(Radio Resource Control，无线资源控制)层生成重配完成消息后发送给PDCP(Packet Data Convergence Protocol，分组数据汇聚协议)层，触发MAC(Media Access Control，媒体访问控制)向目标小区发起随机接入过程，随机接入成功后停止定时器，再继续后续切换流程。
如果在定时器超时时，随机接入过程没有成功，即终端未没有收到目标小区的发送的与所述终端对应的PDCCH(Physical Downlink Control Channel，物理下行控制信道)的调度信息，则终端认为切换失败，此时终端会发起小区重建过程。而进行小区重建则会产生较大的时延。
发明内容
为克服相关技术中存在的问题，本公开实施例提供一种小区切换方法及装置。
根据本公开实施例的第一方面，提供一种小区切换方法，所述方法用于终端，所述方法包括：
如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
向所述第二备选基站发送小区重配完成消息；
如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
可选地，如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，所述方法还包括：
丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。
可选地，所述方法还包括：
向当前接入的源基站发送测量报告，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换；
如果接收到所述源基站返回的携带多个备选基站的小区切换命令消息，则将所述多个备选基站中参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站；
从当前小区请求切换到所述第一备选基站覆盖的小区。
可选地，所述确定第二备选基站，包括：
将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
可选地，所述方法还包括：
如果未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，重复所述确定第二备选基站的步骤，并在之后向所述第二备选基站发送小区重配完成消息，直到成功切换到所述第二备选基站覆盖的小区中。
可选地，所述小区切换命令消息中携带切换参数；所述切换参数包括切换定时器参数和切换计数器参数中的任一项；
其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；
所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。
可选地，所述方法还包括：
如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
可选地，所述方法还包括：
如果所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
根据本公开实施例的第二方面，提供一种小区切换装置，所述装置用于终端，所述装置包括：
第一确定模块，被配置为如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
第一发送模块，被配置为向所述第二备选基站发送小区重配完成消息；
第一切换模块，被配置为如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
可选地，所述装置还包括：
执行模块，被配置为丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。
可选地，所述装置还包括：
第二发送模块，被配置为向当前接入的源基站发送测量报告，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换；
第二确定模块，被配置为如果接收到所述源基站返回的携带多个备选基站的小区切换命令消息，则将所述多个备选基站中参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站；
第二切换模块，被配置为从当前小区请求切换到所述第一备选基站覆盖的小区。
可选地，所述第一确定模块包括：
确定子模块，被配置为将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
可选地，所述装置还包括：
控制模块，被配置为如果未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，控制所述第一确定模块重复所述确定第二备选基站，并在之后控制所述第一发送模块向所述第二备选基站发送小区重配完成消息，直到成功切换到所述第二备选基站覆盖的小区中。
可选地，所述小区切换命令消息中携带切换参数；所述切换参数包括切换定时器参数和切换计数器参数中的任一项；
其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；
所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。
可选地，所述装置还包括：
第一启动模块，被配置为如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
可选地，所述装置还包括：
第二启动模块，被配置为如果所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
根据本公开实施例的第三方面，提供一种计算机可读存储介质，所述存储介质存储有计算机程序，所述计算机程序用于执行上述第一方面所述的小区切换方法。
根据本公开实施例的第四方面，提供一种小区切换装置，所述装置用于终端，包括：
处理器；
用于存储处理器可执行指令的存储器；
其中，所述处理器被配置为：
如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
向所述第二备选基站发送小区重配完成消息；
如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
本公开的实施例提供的技术方案可以包括以下有益效果：
本公开实施例中，终端如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，可以不进行小区重建，而是确定第二备选基站，向所述第二备选基站发送小区重配完成消息；如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。通过上述过程，终端可以在进行小区切换失败之后，再次进行小区切换，避免进行小区重建所造成的较大时延，提升了终端性能。
本公开实施例中，终端可以在从当前小区请求切换到第一备选基站覆盖的小区失败之后，丢弃当前存储的分组数据汇聚协议PDCP层对应的 数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。确保终端在PDCP层的加密和完整性保护算法的准确性，以便后续终端可以向第二备选基站再次发送发送小区重配完成消息。
本公开实施例中，终端可以向源基站发送测量报告，由所述源基站根据所述测量报告确定所述终端是否需要进行小区切换。如果终端接收到源基站返回的携带多个备选基站的小区切换命令消息，终端可以在多个备选基站中选择参考信号质量满足预设的小区选择条件的一个备选基站作为第一备选基站，然后从当前小区请求切换到所述第一备选基站覆盖的小区。可用性高。
本公开实施例中，终端在确定第二备选基站时，可以在源基站提供的多个备选基站中选择未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为第二备选基站。本公开实施例中，终端可以根据源基站提供的多个备选基站来确定再次进行小区切换时的第二备选基站，实现简便，可用性高。
本公开实施例中，如果终端未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，那么重复之前确定第二备选基站的步骤，并在之后向所述第二备选基站发送小区重配完成消息，直到成功切换到第二备选基站覆盖的小区中。在上述实施例中，终端在从当前小区请求切换到第一备选基站覆盖的小区失败之后，可以请求切换到第二备选基站，如果切换再次失败，可以重新确定新的第二备选基站，再次进行小区切换直到成功切换到第二备选基站覆盖的小区中。避免进行小区重建所造成的较大时延，提升了终端性能。
本公开实施例中，源基站可以在返回切换命令消息时携带切换参数，所述切换参数可以是切换定时器参数和切换计数器参数中的任一项。其中，可选地，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。终端可以根据所述切换参数，控制进行小区切换的时长或控制累计进行小 区切换的次数，从而在小区切换时长较长或累计进行小区切换次数较多的情况下，启动小区重建流程，避免终端多次进行小区切换造成较大时延。确保终端业务的正常进行。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本公开。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。
图1是根据一示例性实施例示出的相关技术中一种小区切换场景示意图。
图2是根据一示例性实施例示出的一种小区切换方法流程示意图。
图3是根据一示例性实施例示出的另一种小区切换方法流程图。
图4是根据一示例性实施例示出的另一种小区切换方法流程图。
图5是根据一示例性实施例示出的另一种小区切换方法流程图。
图6是根据一示例性实施例示出的另一种小区切换方法流程图。
图7是根据一示例性实施例示出的另一种小区切换方法流程图。
图8是根据一示例性实施例示出的另一种小区切换方法流程图。
图9是根据一示例性实施例示出的一种小区切换装置框图。
图10是根据一示例性实施例示出的另一种小区切换装置框图。
图11是根据一示例性实施例示出的另一种小区切换装置框图。
图12是根据一示例性实施例示出的另一种小区切换装置框图。
图13是根据一示例性实施例示出的另一种小区切换装置框图。
图14是根据一示例性实施例示出的另一种小区切换装置框图。
图15是根据一示例性实施例示出的另一种小区切换装置框图。
图16是本公开根据一示例性实施例示出的另一种用于小区切换装置的一结构示意图。
具体实施方式
这里将详细地对示例性实施例进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施例中所描述的实施方式并不代表与本发明相一致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本发明的一些方面相一致的装置和方法的例子。
在本公开使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本公开。在本公开和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。
应当理解，尽管在本公开可能采用术语第一、第二、第三等来描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本公开范围的情况下，第一信息也可以被称为第二信息，类似地，第二信息也可以被称为第一信息。取决于语境，如在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”。
本公开实施例提供了一种小区切换方法，可以用于终端，例如，智能手机、平板电脑、个人数字助理(Personal Digital Assistant，PDA)等。照图2所示，图2是根据一示例性实施例示出的一种小区切换方法流程图，可以包括以下步骤：
在步骤101中，如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
在步骤102中，向所述第二备选基站发送小区重配完成消息；
在步骤103中，如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站 覆盖的小区中。
上述实施例中，终端如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，可以不进行小区重建，而是确定第二备选基站，向所述第二备选基站发送小区重配完成消息；如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。通过上述过程，终端可以在进行小区切换失败之后，再次进行小区切换，避免进行小区重建所造成的较大时延，提升了终端性能。
针对上述步骤101，终端如果接收到源基站发送的携带多个备选基站的小区切换命令消息，则终端确定当前需要进行小区切换。其中，所述源基站是覆盖所述当前小区的基站。进一步地，终端可以在所述多个备选基站中确定第一备选基站。可选地，可以将参考信号质量满足预设的小区选择条件的一个备选基站作为第一备选基站。
其中，参考信号质量可以用是RSRP(Reference Signal Receiving Power，参考信号接收功率)和RSRQ((ReferenceSignalReceivingQuality,参考信号接收质量)中的至少一项来表征。
本步骤中，终端可以按照相关技术向第一备选基站发送小区重配完成消息，同时启动一定时器。可选地，该定时器可以是系统切换时使用的T304定时器。如果在该定时器超时时，仍未接收到所述第一备选基站返回的与所述终端对应的PDCCH(Physical Downlink Control Channel，物理下行控制信道)的调度信息，则终端确定从当前小区请求切换到第一备选基站覆盖的小区失败。
此时终端可以不进行小区重建，而是确定第二备选基站。可选地，本公开实施例中，终端可以在源基站返回的所述多个备选基站中确定第二备选基站，所述第二备选基站是所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站。
例如，多个备选基站包括基站A、基站B和基站C。所述第一备选基站为基站A，基站A已经接收过终端发送的小区重配完成消息，基站B和基站C未接收到终端发送的小区重配完成消息。则终端可以在基站B和基站C中选取参考信号质量满足预设的小区选择条件的一个备选基站，假设为基站B作为第二备选基站，并将所述第二备选基站作为所述第二备选基站。
如果基站B和基站C均未接收到终端发送的小区重配完成消息、且均满足参考信号质量满足预设的小区选择条件，则可以选择参考信号质量较好的一个备选基站作为所述第二备选基站。
针对上述步骤102，终端在确定了第二备选基站之后，可以按照相关技术向第二备选基站再次发送小区重配完成消息。同时，终端会按照相关技术再次启动定时器。可选地，该定时器可以是系统切换时使用的T304定时器。
针对上述步骤103，如果在上述T304定时器超时之前，终端接收到第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以按照相关技术执行小区切换过程，切换到所述第二备选基站覆盖的小区中。
上述实施例中，终端可以在进行小区切换失败之后，再次进行小区切换，避免进行小区重建所造成的较大时延，提升了终端性能。
在一实施例中，参照3所示，图3是根据图2所示的实施例示出的另一种小区切换方法流程图，如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，所述小区切换方法还可以包括以下步骤：
在步骤104中，丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。
相关技术中，终端在接收到源基站发送的小区切换命令消息之后，会更新自身PDCP层的加密和完整性保护的算法以及密钥，之后PDCP层收到RRC层生成的重配完成消息后，根据新的加密和完整性保护算法进行 后续处理。
其中，加密和完整性保护的算法所对应的输入参数包括：DIRECTION，BEARER和COUNT。其中DIRECTION用于表征数据传输方向；BEARER用于表终端的无线承载标识；COUNT为计数器，由HFN(HyperFrameNumber，超极子帧号)和PDCP层发送序列号组成，PDCP层每传输一个PDCP对应的数据单元，所述发送序列号加一。
本公开实施例中，由于之前终端请求切换到第一备选基站失败了，PDCP层对应的数据单元的发送序列号已经进行了加一。为了确保终端可以再次向第二备选基站发起小区重配完成消息，可以丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。可选地，所述PDCP层对应的数据单元包括PDU(Protocol Data Unit，协议数据单元)和SDU(service Data Unit，业务数据单元)。
终端可以在执行步骤104之后，再向所述第二备选基站发送小区重配完成消息。如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
上述实施例中，终端可以在从当前小区请求切换到第一备选基站覆盖的小区失败之后，丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。确保终端在PDCP层的加密和完整性保护算法的准确性，以便后续终端可以向第二备选基站再次发送小区重配完成消息。
在一实施例中，参照4所示，图4是根据图2所示的实施例示出的另一种小区切换方法流程图，所述方法还包括：
在步骤100-1中，向当前接入的源基站发送测量报告，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换；
本步骤中，终端先按照相关技术向当前接入的源基站发送测量报告， 所述源基站可以根据该测量报告确定所述终端是否需要进行小区切换。
在步骤100-2中，如果接收到所述源基站返回的携带多个备选基站的小区切换命令消息，则将所述多个备选基站中参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站；
本步骤中，如果需要进行小区切换，则所述源基站会按照相关技术确定多个备选基站，并向多个备选基站发送小区切换请求，多个备选基站各自返回确认消息允许所述终端进行小区切换之后，所述源基站返回携带多个备选基站的小区切换命令消息到所述终端，所述终端可以按照相关技术进行接收。
进一步地，终端可以在源基站提供的多个备选基站中选取参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站。可选地，所述参考信号质量可以用RSRP和RSRQ中的至少一项来表征。
在步骤100-3中，从当前小区请求切换到所述第一备选基站覆盖的小区。
本步骤中，终端会向第一备选基站发送小区重配完成消息，同时终端会启动定时器，可选地，该定时器可以是系统切换时使用的T304定时器。如果在该定时器超时之前，终端接收到第一备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以继续按照相关技术执行小区切换流程，切换到所述第一备选基站覆盖的小区中。
如果终端在上述定时器超时之前，未接收到第一备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端从当前小区请求切换到第一备选基站覆盖的小区失败。此时终端可以执行上述步骤101至步骤103，切换到第二备选基站覆盖的小区中。
上述实施例中，终端可以向源基站发送测量报告，由所述源基站根据所述测量报告确定所述终端是否需要进行小区切换。如果终端接收到源基站返回的携带多个备选基站的小区切换命令消息，终端可以在多个备选基站中选择参考信号质量满足预设的小区选择条件的一个备选基站作为第 一备选基站，然后从当前小区请求切换到所述第一备选基站覆盖的小区。可用性高。
在一实施例中，上述步骤101确定第二备选基站的过程可以包括：将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
本公开实施例中，终端可以在源基站返回的所述多个备选基站中确定第二备选基站，所述第二备选基站是所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站。可选地，参考信号质量可以用RSRP和RSRQ中的至少一项来表征。
进一步地，终端可以在确定了第二备选基站之后，向所述第二备选基站发送小区重配完成消息，如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
在一实施例中，参照5所示，图5是根据图4所示的实施例示出的另一种小区切换方法流程图，上述小区切换方法还可以包括：
在步骤105中，如果未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，重复所述确定第二备选基站的步骤，并在之后向所述第二备选基站发送小区重配完成消息，直到成功切换到所述第二备选基站覆盖的小区中。
本步骤中，如果终端向所述第二备选基站发送小区重配完成消息，如果在T304定时器超时之前未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以再次确定新的第二备选基站。
按照上述步骤101-1，在所述多个备选基站中再次选择未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件 的一个备选基站作为新的第二备选基站。
例如，多个备选基站包括基站A、基站B和基站C。所述第一备选基站为基站A，基站A已经接收过终端发送的小区重配完成消息，基站B和基站C未接收到终端发送的小区重配完成消息。则终端可以在基站B和基站C中选取参考信号质量满足预设的小区选择条件的一个备选基站，假设为基站B，将基站B作为第二备选基站。
如果终端向基站B发送小区重配完成消息，如果在T304定时器超时之前未接收到基站B返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以在上述多个备选基站中再次确定新的第二备选基站，此时可以将基站C作为新的第二备选基站。
终端在确定新的第二备选基站之后，向新的第二备选基站发送小区重配完成消息，如果在T304定时器超时之前，接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以按照相关技术切换到所述第二备选基站覆盖的小区中。如果终端没有接收到新的第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，可以再次重复上述步骤101-1，并在之后向所述第二备选基站发送小区重配完成消息，直到终端成功切换到所述第二备选基站覆盖的小区中。
上述实施例中，如果终端未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，那么重复之前确定第二备选基站的步骤，并在之后向所述第二备选基站发送小区重配完成消息，直到成功切换到第二备选基站覆盖的小区中。在上述实施例中，终端在从当前小区请求切换到第一备选基站覆盖的小区失败之后，可以请求切换到第二备选基站，如果切换再次失败，可以重新确定新的第二备选基站，再次进行小区切换直到成功切换到第二备选基站覆盖的小区中。避免进行小区重建所造成的较大时延，提升了终端性能。
在一实施例中，终端如果长时间或多次进行小区切换，同样会造成 较大时延，影响终端业务。因此，本公开实施例中，源基站在向所述终端返回的小区切换命令消息中可以携带切换参数。所述切换参数包括切换定时器参数和切换计数器参数中的任一项；其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。
终端可以根据上述切换参数控制自身进行小区切换的时长或累计进行小区切换的次数。
在一实施例中，参照6所示，图6是根据图5所示的实施例示出的另一种小区切换方法流程图，上述小区切换方法还可以包括：
在步骤106中，如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
本步骤中，终端可以从当前小区请求切换到第一备选基站覆盖的小区失败时，启动切换定时器，切换定时器的时长为所述切换定时器参数所指示的有效时长。终端向所述第二备选基站发送小区重配完成消息，如果切换定时器超时时，终端仍未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以停止进行小区切换，按照相关技术启动小区重建流程。
可选地，终端可以从当前小区请求切换到第一备选基站覆盖的小区时就启动所述切换定时器，如果终端从当前小区请求切换到第一备选基站覆盖的小区失败，终端向所述第二备选基站发送小区重配完成消息，在切换定时器超时时，如果终端仍未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以停止进行小区切换，按照相关技术启动小区重建流程。
在一实施例中，参照7所示，图7是根据图5所示的实施例示出的另一种小区切换方法流程图，上述小区切换方法还可以包括：
在步骤107中，如果所述终端累计进行小区切换的次数达到所述切 换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
本步骤中，终端可以从当前小区请求切换到第一备选基站覆盖的小区失败之后，启动切换计数器，该切换计数器的初始值为零。终端每向所述第二备选基站发送一次小区重配完成消息，则将切换计数器的数值加一。如果所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，即切换计数器统计的次数达到所述最大值，
并且终端仍未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以停止进行小区切换，按照相关技术启动小区重建流程。
可选地，所述终端可以从当前小区请求切换到第一备选基站覆盖的小区时就启动所述切换计数器，该切换计数器的初始值为零。如果终端从当前小区请求切换到第一备选基站覆盖的小区失败，切换计数器的数值加一。终端每向所述第二备选基站发送一次小区重配完成消息，切换计数器的数值也加一。在所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，即切换计数器统计的次数达到所述最大值，并且终端仍未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则终端可以停止进行小区切换，按照相关技术启动小区重建流程。
上述实施例中，源基站可以在返回切换命令消息时携带切换参数，所述切换参数可以是切换定时器参数和切换计数器参数中的任一项。其中，可选地，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。终端可以根据所述切换参数，控制进行小区切换的时长或控制累计进行小区切换的次数，从而在小区切换时长较长或累计进行小区切换次数较多的情况下，启动小区重建流程，避免终端多次进行小区切换造成较大时延。 确保终端业务的正常进行。
在一实施例中，参照8所示，图8是根据一实施例示出的另一种小区切换方法流程图，所述小区切换方法可以包括：
在步骤201中，终端向当前接入的源基站发送测量报告；
其中，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换。
在步骤202中，源基站返回的携带多个备选基站和切换参数的小区切换命令消息到终端。
本步骤中，源基站确定终端需要进行小区切换，则由源基站向多个第二备选基站发送切换请求，多个第二备选基站确认完成后，由源基站发送小区切换命令消息给所述终端(图8中未示出)，所述小区切换命令消息中携带所述多个第二备选基站各自覆盖的目标小区的配置信息。
所述切换参数包括切换定时器参数和切换计数器参数中的任一项；其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。
在步骤203中，终端在多个备选基站中确定第一备选基站。
在步骤204中，终端向所述第一备选基站发送小区重配完成消息。
在步骤205中，终端从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站。
本步骤中，终端将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
在步骤206中，终端向第二备选基站发送小区重配完成消息。
在步骤207中，如果终端未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则重复上述步骤205至206。
在步骤208中，如果终端接收到所述第二备选基站返回的与所述终 端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
在步骤209中，如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长或所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
对上述实施例进一步举例说明如下。
例子1，终端接收到源基站发送的小区切换命令消息时，小区切换命令消息中携带多个备选基站包括基站A、基站B和基站C,同时小区切换命令消息中携带切换定时器参数T。终端向基站A发送小区重配完成消息进行小区切换失败之后，终端丢弃当前存储的PDCP层对应的数据单元，包括PDU和SDU，并将PDCP层对应的数据单元的发送序列号减一，并启动切换定时器，该切换定时器的时长为T。
终端对基站B和基站C进行测量，如果基站B的参考信号质量满足预设的小区选择条件，则终端向B基站发送小区重配完成消息。如果终端再次发生小区切换失败的情况，此时终端再次丢弃当前存储的PDCP层对应的数据单元，包括PDU和SDU，并将PDCP层对应的数据单元的发送序列号减一。
如果基站C的参考信号质量满足预设的小区选择条件，则终端向基站C发送小区重配完成消息。
如果切换成功，则停止切换计时器。如果切换定时器超时，则终端启动小区重建流程。
例子2，终端接收到源基站发送的小区切换命令消息时，小区切换命令消息中携带多个备选基站包括基站A、基站B和基站C,同时小区切换命令消息中携带切换计数器参数CT。终端向基站A发送小区重配完成消息进行小区切换失败之后，终端丢弃当前存储的PDCP层对应的数据单元， 包括PDU和SDU，并将PDCP层对应的数据单元的发送序列号减一，由零开始每发起一次小区切换，则将终端累计进行小区切换的次数加一。
终端对基站B和基站C进行测量，如果基站B的参考信号质量满足预设的小区选择条件，则终端向B基站发送小区重配完成消息。如果终端再次发生小区切换失败的情况，此时终端再次丢弃当前存储的PDCP层对应的数据单元，包括PDU和SDU，并将PDCP层对应的数据单元的发送序列号减一。并将终端累计进行小区切换的次数再加一。
如果基站C的参考信号质量满足预设的小区选择条件，则终端向基站C发送小区重配完成消息。
如果切换成功，则停止累加终端累计进行小区切换的次数。如果终端累计进行小区切换的次数达到最大次数，则终端启动小区重建流程。
上述实施例中，终端可以在进行小区切换失败之后，再次进行小区切换，避免进行小区重建所造成的较大时延，提升了终端性能。另外，终端可以根据所述切换参数，控制进行小区切换的时长或控制累计进行小区切换的次数，从而在小区切换时间较长或累计切换次数较多的情况下，进行小区重建，避免终端多次进行小区切换造成较大时延。确保终端业务的正常进行。
与前述应用功能实现方法实施例相对应，本公开还提供了应用功能实现装置、及相应的终端的实施例。
参照图9，图9是根据一示例性实施例示出的一种小区切换装置框图，所述装置用于终端，所述装置包括：
第一确定模块310，被配置为如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
第一发送模块320，被配置为向所述第二备选基站发送小区重配完成消息；
第一切换模块330，被配置为如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述 第二备选基站覆盖的小区中。
参照图10，图10是根据图9所示实施例的基础上示出的另一种小区切换装置框图，所述装置还包括：
执行模块340，被配置为丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。
参照图11，图11是根据图9所示实施例的基础上示出的另一种小区切换装置框图，所述装置还包括：
第二发送模块350，被配置为向当前接入的源基站发送测量报告，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换；
第二确定模块360，被配置为如果接收到所述源基站返回的携带多个备选基站的小区切换命令消息，则将所述多个备选基站中参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站；
第二切换模块370，被配置为从当前小区请求切换到所述第一备选基站覆盖的小区。
参照图12，图12是根据图11所示实施例的基础上示出的另一种小区切换装置框图，所述第一确定模块310包括：
确定子模块311，被配置为将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
参照图13，图13是根据图12所示实施例的基础上示出的另一种小区切换装置框图，所述装置还包括：
控制模块380，被配置为如果未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，控制所述第一确定模块310重复所述确定第二备选基站，并在之后控制所述第一发送模块320向所述第二备选基站发送小区重配完成消息，直到成功切换到所述第二备选基站覆盖的小区中。
可选地，所述小区切换命令消息中携带切换参数；所述切换参数包括切换定时器参数和切换计数器参数中的任一项；
其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；
所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。
参照图14，图14是根据图13所示实施例的基础上示出的另一种小区切换装置框图，所述装置还包括：
第一启动模块410，被配置为如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
参照图15，图15是根据图13所示实施例的基础上示出的另一种小区切换装置框图，所述装置还包括：
第二启动模块420，被配置为如果所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
对于装置实施例而言，由于其基本对应于方法实施例，所以相关之处参见方法实施例的部分说明即可。以上所描述的装置实施例仅仅是示意性的，其中上述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本公开方案的目的。本领域普通技术人员在不付出创造性劳动的情况下，即可以理解并实施。
相应地，本公开还提供了一种计算机可读存储介质，所述存储介质存储有计算机程序，所述计算机程序用于执行上述任一所述的小区切换方 法。
相应地，本公开还提供了一种小区切换装置，所述装置用于终端，包括：
处理器；
用于存储处理器可执行指令的存储器；
其中，所述处理器被配置为：
如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
向所述第二备选基站发送小区重配完成消息；
如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
图16是根据一示例性实施例示出的一种小区切换装置的结构示意图。如图16所示，根据一示例性实施例示出的一种小区切换装置1600，该装置1600可以是计算机，移动电话，数字广播终端，消息收发设备，游戏控制台，平板设备，医疗设备，健身设备，个人数字助理等终端。
参照图16，装置1600可以包括以下一个或多个组件：处理组件1601，存储器1602，电源组件1603，多媒体组件1604，音频组件1605，输入/输出(I/O)的接口1606，传感器组件1607，以及通信组件1608。
处理组件1601通常控制装置1600的整体操作，诸如与显示，电话呼叫，数据通信，相机操作和记录操作相关联的操作。处理组件1601可以包括一个或多个处理器1609来执行指令，以完成上述的方法的全部或部分步骤。此外，处理组件1601可以包括一个或多个模块，便于处理组件1601和其它组件之间的交互。例如，处理组件1601可以包括多媒体模块，以方便多媒体组件1604和处理组件1601之间的交互。
存储器1602被配置为存储各种类型的数据以支持在装置1600的操作。这些数据的示例包括用于在装置1600上操作的任何应用程序或方法的指令，联系人数据，电话簿数据，消息，图片，视频等。存储器1602可以 由任何类型的易失性或非易失性存储设备或者它们的组合实现，如静态随机存取存储器(SRAM)，电可擦除可编程只读存储器(EEPROM)，可擦除可编程只读存储器(EPROM)，可编程只读存储器(PROM)，只读存储器(ROM)，磁存储器，快闪存储器，磁盘或光盘。
电源组件1603为装置1600的各种组件提供电力。电源组件1603可以包括电源管理系统，一个或多个电源，及其它与为装置1600生成、管理和分配电力相关联的组件。
多媒体组件1604包括在所述装置1600和用户之间的提供一个输出接口的屏幕。在一些实施例中，屏幕可以包括液晶显示器(LCD)和触摸面板(TP)。如果屏幕包括触摸面板，屏幕可以被实现为触摸屏，以接收来自用户的输入信号。触摸面板包括一个或多个触摸传感器以感测触摸、滑动和触摸面板上的手势。所述触摸传感器可以不仅感测触摸或滑动动作的边界，而且还检测与所述触摸或滑动操作相关的持续时间和压力。在一些实施例中，多媒体组件1604包括一个前置摄像头和/或后置摄像头。当装置1600处于操作模式，如拍摄模式或视频模式时，前置摄像头和/或后置摄像头可以接收外部的多媒体数据。每个前置摄像头和后置摄像头可以是一个固定的光学透镜系统或具有焦距和光学变焦能力。
音频组件1605被配置为输出和/或输入音频信号。例如，音频组件1605包括一个麦克风(MIC)，当装置1600处于操作模式，如呼叫模式、记录模式和语音识别模式时，麦克风被配置为接收外部音频信号。所接收的音频信号可以被进一步存储在存储器1602或经由通信组件1608发送。在一些实施例中，音频组件1605还包括一个扬声器，用于输出音频信号。
I/O接口1606为处理组件1601和外围接口模块之间提供接口，上述外围接口模块可以是键盘，点击轮，按钮等。这些按钮可包括但不限于：主页按钮、音量按钮、启动按钮和锁定按钮。
传感器组件1607包括一个或多个传感器，用于为装置1600提供各个方面的状态评估。例如，传感器组件1607可以检测到装置1600的打开/ 关闭状态，组件的相对定位，例如所述组件为装置1600的显示器和小键盘，传感器组件1607还可以检测装置1600或装置1600一个组件的位置改变，用户与装置1600接触的存在或不存在，装置1600方位或加速/减速和装置1600的温度变化。传感器组件1607可以包括接近传感器，被配置用来在没有任何的物理接触时检测附近物体的存在。传感器组件1607还可以包括光传感器，如CMOS或CCD图像传感器，用于在成像应用中使用。在一些实施例中，该传感器组件1607还可以包括加速度传感器，陀螺仪传感器，磁传感器，压力传感器或温度传感器。
通信组件1608被配置为便于装置1600和其它设备之间有线或无线方式的通信。装置1600可以接入基于通信标准的无线网络，如WiFi，2G或3G，或它们的组合。在一个示例性实施例中，通信组件1608经由广播信道接收来自外部广播管理系统的广播信号或广播相关信息。在一个示例性实施例中，所述通信组件1608还包括近场通信(NFC)模块，以促进短程通信。例如，在NFC模块可基于射频识别(RFID)技术，红外数据协会(IrDA)技术，超宽带(UWB)技术，蓝牙(BT)技术和其它技术来实现。
在示例性实施例中，装置1600可以被一个或多个应用专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、现场可编程门阵列(FPGA)、控制器、微控制器、微处理器或其它电子元件实现，用于执行上述方法。
在示例性实施例中，还提供了一种包括指令的非临时性计算机可读存储介质，例如包括指令的存储器1602，上述指令可由装置1600的处理器1609执行以完成上述方法。例如，所述非临时性计算机可读存储介质可以是ROM、随机存取存储器(RAM)、CD-ROM、磁带、软盘和光数据存储设备等。
其中，当所述存储介质中的指令由所述处理器执行时，使得装置1600能够执行上述任一所述的用于终端侧的小区切换方法。
本领域技术人员在考虑说明书及实践这里公开的发明后，将容易想到本公开的其它实施方案。本公开旨在涵盖本公开的任何变型、用途或者适应性变化，这些变型、用途或者适应性变化遵循本公开的一般性原理并包括本公开未公开的本技术领域中的公知常识或者惯用技术手段。说明书和实施例仅被视为示例性的，本公开的真正范围和精神由下面的权利要求指出。
应当理解的是，本公开并不局限于上面已经描述并在附图中示出的精确结构，并且可以在不脱离其范围进行各种修改和改变。本公开的范围仅由所附的权利要求来限制。

Claims (18)

  1. 一种小区切换方法，其特征在于，所述方法用于终端，所述方法包括：
    如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
    向所述第二备选基站发送小区重配完成消息；
    如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
  2. 根据权利要求1所述的方法，其特征在于，如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，所述方法还包括：
    丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。
  3. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    向当前接入的源基站发送测量报告，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换；
    如果接收到所述源基站返回的携带多个备选基站的小区切换命令消息，则将所述多个备选基站中参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站；
    从当前小区请求切换到所述第一备选基站覆盖的小区。
  4. 根据权利要求3所述的方法，其特征在于，所述确定第二备选基站，包括：
    将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    如果未接收到所述第二备选基站返回的与所述终端对应的物理下行控 制信道PDCCH的调度信息，重复所述确定第二备选基站的步骤，并在之后向所述第二备选基站发送小区重配完成消息，直到成功切换到所述第二备选基站覆盖的小区中。
  6. 根据权利要求3-5任一项所述的方法，其特征在于，所述小区切换命令消息中携带切换参数；所述切换参数包括切换定时器参数和切换计数器参数中的任一项；
    其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；
    所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大值。
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
  8. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    如果所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
  9. 一种小区切换装置，其特征在于，所述装置用于终端，所述装置包括：
    第一确定模块，被配置为如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
    第一发送模块，被配置为向所述第二备选基站发送小区重配完成消息；
    第一切换模块，被配置为如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
  10. 根据权利要求9所述的装置，其特征在于，所述装置还包括：
    执行模块，被配置为丢弃当前存储的分组数据汇聚协议PDCP层对应的数据单元，以及将所述PDCP层对应的数据单元的发送序列号减一。
  11. 根据权利要求9所述的装置，其特征在于，所述装置还包括：
    第二发送模块，被配置为向当前接入的源基站发送测量报告，所述测量报告用于所述源基站确定所述终端是否需要进行小区切换；
    第二确定模块，被配置为如果接收到所述源基站返回的携带多个备选基站的小区切换命令消息，则将所述多个备选基站中参考信号质量满足预设的小区选择条件的一个备选基站作为所述第一备选基站；
    第二切换模块，被配置为从当前小区请求切换到所述第一备选基站覆盖的小区。
  12. 根据权利要求11所述的装置，其特征在于，所述第一确定模块包括：
    确定子模块，被配置为将所述多个备选基站中未接收到所述终端发送的小区重配完成消息、且参考信号质量满足预设的小区选择条件的一个备选基站作为所述第二备选基站。
  13. 根据权利要求12所述的装置，其特征在于，所述装置还包括：
    控制模块，被配置为如果未接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，控制所述第一确定模块重复所述确定第二备选基站，并在之后控制所述第一发送模块向所述第二备选基站发送小区重配完成消息，直到成功切换到所述第二备选基站覆盖的小区中。
  14. 根据权利要求11-13任一项所述的装置，其特征在于，所述小区切换命令消息中携带切换参数；所述切换参数包括切换定时器参数和切换计数器参数中的任一项；
    其中，所述切换定时器参数用于指示所述终端进行小区切换的有效时长；
    所述切换计数器参数用于指示所述终端累计进行小区切换次数的最大 值。
  15. 根据权利要求14所述的装置，其特征在于，所述装置还包括：
    第一启动模块，被配置为如果所述终端进行小区切换的时长达到所述切换定时器参数所指示的有效时长，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
  16. 根据权利要求14所述的装置，其特征在于，所述装置还包括：
    第二启动模块，被配置为如果所述终端累计进行小区切换的次数达到所述切换计数器参数所指示的最大值，并且未收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则启动小区重建流程。
  17. 一种计算机可读存储介质，其特征在于，所述存储介质存储有计算机程序，所述计算机程序用于执行上述权利要求1-8任一所述的小区切换方法。
  18. 一种小区切换装置，其特征在于，所述装置用于终端，包括：
    处理器；
    用于存储处理器可执行指令的存储器；
    其中，所述处理器被配置为：
    如果从当前小区请求切换到第一备选基站覆盖的小区失败之后，确定第二备选基站；
    向所述第二备选基站发送小区重配完成消息；
    如果接收到所述第二备选基站返回的与所述终端对应的物理下行控制信道PDCCH的调度信息，则切换到所述第二备选基站覆盖的小区中。
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