WO2022089200A1 - 用于小区切换的方法和装置 - Google Patents

用于小区切换的方法和装置 Download PDF

Info

Publication number
WO2022089200A1
WO2022089200A1 PCT/CN2021/123323 CN2021123323W WO2022089200A1 WO 2022089200 A1 WO2022089200 A1 WO 2022089200A1 CN 2021123323 W CN2021123323 W CN 2021123323W WO 2022089200 A1 WO2022089200 A1 WO 2022089200A1
Authority
WO
WIPO (PCT)
Prior art keywords
cell
target cell
terminal
information
configuration information
Prior art date
Application number
PCT/CN2021/123323
Other languages
English (en)
French (fr)
Inventor
王君
吕永霞
王婷
马江镭
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.)
Filing date
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 EP21884929.7A priority Critical patent/EP4221339A4/en
Publication of WO2022089200A1 publication Critical patent/WO2022089200A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • 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
    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00838—Resource reservation for handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a method and apparatus for cell handover, a communication system, a chip system, a computer-readable storage medium, and a computer program.
  • the English full text of the fifth generation (5G) wireless access technology is New Radio, or NR for short.
  • a terminal In the NR system, a terminal (User Equipment: UE) has three states: an idle (Idle) state, an inactive (Inactive) state, and a connected (Connected) state.
  • an idle (Idle) state In the NR system, a terminal (User Equipment: UE) has three states: an idle (Idle) state, an inactive (Inactive) state, and a connected (Connected) state.
  • FIG. 1 shows a schematic diagram of cell handover of a UE in a connected state in the prior art.
  • a connected UE moves from cell 1 to cell 2, from cell 2 to cell 3, and from cell 3 to cell 4, cell handover occurs.
  • Each cell handover includes four steps: measurement configuration Issue G1, measurement report G2, handover command (Handover Command: HO CMD) or conditional handover command (Conditional Handover Command: CHO CMD) to issue G3 and random access G4.
  • the serving cell of the UE delivers the measurement configuration to the UE in advance.
  • the serving cell refers to the measurement report reported by the UE (optionally, it may not refer to the measurement report), selects the target cell to be handed over by the UE, and notifies the target cell to prepare for handover-related Resources (for example, the frequency of the target cell and the physical layer cell identity (Physical-layer Cell Identity: PCI), dedicated preamble (Preamble), data radio bearer (Data Radio Bearer: DRB) configuration, resource-free (Grant Free: GF) ) configuration, etc.), and then deliver the handover-related resources of the target cell to the UE through a handover command.
  • PCI Physical-layer Cell Identity
  • Preamble dedicated preamble
  • DRB data radio bearer
  • DRB resource-free
  • Grant Free resource-free
  • the UE After receiving the handover command or conditional handover command issued by the serving cell, the UE initiates access to the target cell (for example, accesses the target cell through a dedicated preamble or a common preamble), and sends Handover complete (HO complete) message to the target cell. So far, from the perspective of the air interface, a complete handover process of the UE in the connected state is completed.
  • the target cell for example, accesses the target cell through a dedicated preamble or a common preamble
  • HO complete Handover complete
  • the cell handover of the UE in the connected state is controlled by the network.
  • the inventor found that the cell handover controlled by the network uses a lot of handover-related control signaling (for example, measurement configuration issuance, measurement report reporting, and handover command issuance), and the UE transmits and receives these control signaling.
  • the power of the UE will be consumed, especially if the high-speed moving UE is always in the connected state, the UE will frequently perform cell switching, which will cause the power consumption of the UE to be very fast.
  • the embodiments of the present application provide a method and apparatus for cell handover, by which terminal energy saving can be achieved.
  • a first aspect provides a method for cell handover, the method comprising: a terminal receiving at least one configuration information from a serving cell, the at least one configuration information is provided by at least one target cell; the terminal selecting a cell to be handed over a first target cell, wherein the first target cell is one of the at least one target cell; the terminal switches to the first target cell according to the selection; and the terminal switches according to the first target cell
  • the configuration information corresponding to a target cell is communicated.
  • the terminal selects the target cell to be handed over and switches to the selected target cell according to the selection, that is, the terminal autonomously selects the cell to be handed over and switches to the selected cell without the need for network control. In this process, the terminal does not need to upload
  • the measurement report and the handover command issued by the cell reduce the signaling overhead related to the handover and correspondingly reduce the power consumption of the terminal, thus enabling the terminal to save energy.
  • the selecting, by the terminal, the first target cell to be handed over includes: the terminal receiving, by the terminal, a cell reselection parameter delivered by the serving cell; The terminal performs a cell reselection process based on the received cell reselection parameters to select the first target cell as the cell to be handed over. The terminal adopts the cell reselection process to select the cell to be handed over, and can quickly select the cell to be handed over.
  • the selecting, by the terminal, the first target cell to be handed over includes: the terminal measuring signal quality of at least adjacent cells of the serving cell; the The terminal determines that the signal quality of at least a first neighbor cell is such that a specified measurement event is satisfied and the first neighbor cell is one of the at least one target cell; and, the terminal selects the first neighbor cell A cell is used as the first target cell.
  • the terminal selects the cell to be handed over based on the measurement event, and can accurately select the cell that can be handed over.
  • the terminal performing communication according to the configuration information corresponding to the first target cell includes: the The terminal sends uplink data or signaling.
  • the terminal notifies that it has switched to the selected target cell by sending uplink data or signaling, so that the selected target cell can quickly know which cell the terminal is currently in, and send downlink control information and data scheduling to the terminal in time. Therefore, the fast scheduling and transmission of downlink data can still be satisfied while saving the switching signaling overhead of the terminal.
  • the configuration information includes uplink synchronization information associated with the at least one target cell.
  • the configuration information includes uplink synchronization information associated with the cell, and the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing the time required for uploading data and/or signaling. extension.
  • the configuration information includes: reserved resources and valid time information corresponding to the resources.
  • the uplink synchronization information includes a timing advance.
  • the uplink synchronization information includes the use timing advance, which can advantageously prevent the data and/or signaling uploaded by the terminal from interfering with the signal reception of the cell.
  • the uplink synchronization information includes a mapping relationship between different values of measurement parameters and timing advance
  • the uploading of data or signaling by the terminal includes: the terminal obtains the actual value of the measurement parameter; the terminal determines, according to the actual value of the measurement parameter and the mapping relationship associated with the first target cell, to determine the timing advance of the first target cell; and, the terminal sends the uplink data or signaling according to the determined timing advance.
  • the terminal can send uplink data and/or signaling using a timing advance that is relatively matched with the actual situation of the terminal, thereby more advantageously avoiding The data and/or signaling uploaded by the terminal interfere with the signal reception of the cell.
  • the measurement parameter includes at least one of the following: time information, the first target cell and/or or the signal quality of downlink signals of one or more neighboring cells, the geographic location of the terminal, and the separation distance between the terminal and the first target cell.
  • the method further includes: while or after sending the uplink data or signaling, The terminal sends at least one of the following to the first target cell: the identity of the serving cell and the identity of the terminal in the serving cell; the information of the at least one target cell; A message of configuration information of more target cells of the terminal.
  • the first target cell can obtain data related to the terminal from the serving cell (eg, , the downlink data that has been received by the serving cell but has not been successfully sent to the terminal, the uplink data that the serving cell has successfully received from the terminal but has not been successfully forwarded to the core network element and/or the terminal context information, etc.), so as to send the downlink data of the terminal backlogged in the serving cell to the terminal to ensure that no packet loss occurs.
  • the serving cell eg, the downlink data that has been received by the serving cell but has not been successfully sent to the terminal, the uplink data that the serving cell has successfully received from the terminal but has not been successfully forwarded to the core network element and/or the terminal context information, etc.
  • the first target cell By sending the information of the at least one target cell to the first target cell, the first target cell can determine whether the terminal needs more configuration information of the target cell, and deliver it to the terminal in advance when necessary More configuration information of the target cell, thereby preventing the terminal from frequently asking for the configuration information of the target cell during the moving process.
  • the first target cell By sending a message for requesting the configuration information of more target cells of the terminal to the first target cell, the first target cell can deliver the configuration information to the terminal in advance before the terminal switches to other cells. Configuration information of the multi-target cell.
  • the at least one target cell when there are multiple at least one target cell, includes At least two target cells for serial handover.
  • the terminal has in advance the configuration information of the target cell for subsequent serial handover, and after the terminal completes access to a new target cell each time, The previously received configuration information of the target cell of the serial handover is not discarded, and the configuration information is not discarded until the valid time corresponding to the configuration information expires. Therefore, the terminal can avoid frequently asking for the configuration information of the target cell.
  • the method further includes: before or after handover to the first target cell , the terminal sends notification information to the serving cell, where the notification information indicates that the terminal has been handed over to another cell.
  • the terminal sends notification information to the serving cell, where the notification information indicates that the terminal has been handed over to another cell.
  • the UE sends notification information to the serving cell to indicate that the UE has been handed over to another cell.
  • the UE sends notification information to the serving cell to indicate that the UE has been handed over to another cell.
  • the original serving cell can disconnect the connection with the original serving cell in time to stop downlink scheduling for the terminal and release the allocated Resources for a terminal are used by other terminals, which can improve resource utilization.
  • a second aspect provides a method for cell handover, comprising: determining a target cell; sending a request message to the target cell, the request message requesting the target cell to reserve resources for a terminal;
  • the cell receives configuration information, where the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell; and sends the terminal to the terminal. configuration information.
  • the resources reserved for the terminal by the potential target cells are delivered to the terminal in advance. Therefore, after camping on and switching to these potential target cells, the terminal can directly use the resources delivered in advance for uplink data or signaling transmission, which can speed up the uplink data. or signaling transmission.
  • the uplink synchronization information associated with the potential target cell is delivered to the terminal in advance, so that when the cell switched by the terminal is the potential target cell, the terminal can perform uplink data and/or data without using a contention-based random access procedure. or signaling, thereby reducing the upload delay of data and/or signaling.
  • the effective time information corresponding to the resource reserved to the terminal is issued to the terminal in advance. Therefore, after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to provide it to other End use, which can improve resource utilization.
  • the request message includes the proposed resource effective time information, and/or the proposed uplink synchronization information and/or the information used to determine the uplink synchronization information.
  • the request message sent to the target cell includes the information on the effective time of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information, which can help the target cell to effectively determine the Effective time information corresponding to the resources reserved by the terminal and uplink synchronization information associated with the target cell.
  • the uplink synchronization information includes a timing advance, or different values of measurement parameters and timing advance The mapping relationship between the quantities.
  • the timing advance in the uplink synchronization information, it can advantageously prevent the data and/or signaling uploaded by the UE from interfering with the signal reception of the cell.
  • the terminal can send uplink data and/or signaling using a timing advance that is relatively matched with the actual situation of the terminal, thereby more advantageously avoiding The data and/or signaling uploaded by the terminal interfere with the signal reception of the cell.
  • the measurement parameter includes time information, signal quality of a downlink signal of a cell, a geographic location of the terminal, or The separation distance between the terminal and the cell.
  • a third aspect provides a method for cell handover, the method comprising: receiving a request message from a serving cell, the request message requesting a target cell to reserve resources for a terminal; and sending configuration information to the serving cell,
  • the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the resource reserved by the target cell for the terminal is delivered to the terminal by the serving cell. Therefore, after camping on and switching to the target cell, the terminal can directly use the resource for uplink data or signaling transmission, thereby speeding up uplink data or signaling. transmission.
  • the uplink synchronization information associated with the target cell is delivered to the terminal by the serving cell, so that when the cell switched by the terminal is the target cell, the terminal can perform uplink data and/or data without using a contention-based random access procedure. or signaling, thereby reducing the upload delay of data and/or signaling.
  • the effective time information corresponding to the resource reserved for the terminal is delivered to the terminal by the serving cell. Therefore, after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to provide it Used by other terminals, which can improve resource utilization.
  • the request message includes the information on the effective time of the proposed resource, and/or the proposed uplink synchronization information and/or the information used to determine the uplink synchronization information.
  • the auxiliary information, and the effective time information corresponding to the reserved resources and/or the uplink synchronization information associated with the target cell are based on the effective time information of the proposed resources, and/or, the proposed uplink synchronization information and / or set for auxiliary information for determining uplink synchronization information.
  • the effective time information of the resources proposed by the serving cell and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information, it can help the target cell to effectively determine the corresponding resources reserved for the terminal.
  • effective time information and uplink synchronization information associated with the target cell can help the target cell to effectively determine the corresponding resources reserved for the terminal.
  • the method further includes: receiving uplink information of the terminal; and registering the terminal is the terminal handed over to the target cell.
  • the terminal's uplink information is received for the first time, the terminal is registered as a terminal to be handed over to the target cell, so that the target cell can know that the terminal has been handed over to it, so as to send downlink control information and schedule data to the terminal in time.
  • an apparatus for cell handover includes a receiving unit, a selecting unit, a switching unit and a communication unit.
  • the receiving unit is configured to receive at least one configuration information from a serving cell, where the at least one configuration information is provided by at least one target cell.
  • the selection unit is configured to select a first target cell to be handed over, wherein the first target cell is one of the at least one target cell.
  • the switching unit is configured to switch to the first target cell according to the selection.
  • the communication unit is configured to communicate according to the configuration information corresponding to the first target cell.
  • the terminal selects the target cell to be handed over and switches to the selected target cell according to the selection, that is, the terminal autonomously selects the cell to be handed over and switches to the selected cell without the need for network control. In this process, the terminal does not need to upload
  • the measurement report and the handover command issued by the cell reduce the signaling overhead related to the handover and correspondingly reduce the power consumption of the terminal, thus enabling the terminal to save energy.
  • the receiving unit is further configured to receive a cell reselection parameter delivered by the serving cell
  • the selecting unit is further configured to, based on the received A cell reselection process is performed to select the first target cell as the cell to be handed over.
  • the terminal adopts the cell reselection process to select the cell to be handed over, and can quickly select the cell to be handed over.
  • the apparatus further includes a measuring unit for measuring signal quality of at least the neighboring cells of the serving cell, wherein the selecting unit further uses for determining the signal quality of at least a first neighboring cell such that the specified measurement event is satisfied and the first neighboring cell is one of the at least one target cell, and selecting the first neighboring cell as the Describe the first target cell.
  • the terminal selects the cell to be handed over based on the measurement event, and can accurately select the cell that can be handed over.
  • the communication unit is further configured to send uplink data or signaling.
  • the terminal notifies that it has switched to the selected target cell by sending uplink data or signaling, so that the selected target cell can quickly know which cell the terminal is currently in, and send downlink control information and data scheduling to the terminal in time. Therefore, the fast scheduling and transmission of downlink data can still be satisfied while saving the switching signaling overhead of the terminal.
  • the configuration information includes uplink synchronization information associated with the at least one target cell.
  • the configuration information includes uplink synchronization information associated with the cell, and the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing the time required for uploading data and/or signaling. extension.
  • the configuration information includes: reserved resources and valid time information corresponding to the resources.
  • the uplink synchronization information includes a timing advance.
  • the uplink synchronization information includes the use timing advance, which can advantageously prevent the data and/or signaling uploaded by the terminal from interfering with the signal reception of the cell.
  • the uplink synchronization information includes a mapping relationship between different values of measurement parameters and timing advance
  • the apparatus further includes an acquisition unit for acquiring the actual value of the measurement parameter and for determining the first target cell according to the actual value of the measurement parameter and the mapping relationship associated with the first target cell A unit for determining the timing advance of the target cell
  • the communication unit is further configured to send the uplink data or signaling according to the determined timing advance.
  • the terminal can send uplink data and/or signaling using a timing advance that is relatively matched with the actual situation of the terminal, thereby more advantageously avoiding The data and/or signaling uploaded by the terminal interfere with the signal reception of the cell.
  • the measurement parameter includes at least one of the following: time information, the first target cell and/or or the signal quality of downlink signals of one or more neighboring cells, the geographic location of the terminal, and the separation distance between the terminal and the first target cell.
  • the communication unit is further configured to, while or after sending the uplink data or signaling, Send at least one of the following to the first target cell: the identity of the serving cell and the identity of the terminal in the serving cell; the information of the at least one target cell; more information about the configuration of the target cell.
  • the first target cell can obtain data related to the terminal from the serving cell (eg, , the downlink data that has been received by the serving cell but has not been successfully sent to the terminal, the uplink data that the serving cell has successfully received from the terminal but has not been successfully forwarded to the core network element and/or the terminal context information, etc.), so as to send the downlink data of the terminal backlogged in the serving cell to the terminal to ensure that no packet loss occurs.
  • the serving cell eg, the downlink data that has been received by the serving cell but has not been successfully sent to the terminal, the uplink data that the serving cell has successfully received from the terminal but has not been successfully forwarded to the core network element and/or the terminal context information, etc.
  • the first target cell By sending the information of the at least one target cell to the first target cell, the first target cell can determine whether the terminal needs more configuration information of the target cell, and deliver it to the terminal in advance when necessary More configuration information of the target cell, thereby preventing the terminal from frequently asking for the configuration information of the target cell during the moving process.
  • the first target cell By sending a message for requesting the configuration information of more target cells of the terminal to the first target cell, the first target cell can deliver the configuration information to the terminal in advance before the terminal switches to other cells. Configuration information of the multi-target cell.
  • the at least one target cell when the at least one target cell is multiple, the at least one target cell includes at least two target cell for serial handover.
  • the terminal already has the configuration information of the target cell for subsequent handovers in advance, and the terminal originally receives the The configuration information of the target cell of the serial handover is not discarded, and the configuration information is not discarded until the valid time corresponding to the configuration information expires. Therefore, the terminal can avoid frequently asking for the configuration information of the target cell.
  • the apparatus further includes a sending unit, and the sending unit is configured to switch to the first After a target cell, notification information is sent to the serving cell, the notification information indicating that the terminal has been handed over to another cell. After switching to another cell, the terminal sends notification information to the original serving cell to inform the terminal that the terminal has been switched to another cell, and the original serving cell can release the resources allocated to the terminal in time for use by other terminals, which can improve resource utilization.
  • an apparatus for cell handover includes a determining unit, a first sending unit, a receiving unit, and a second sending unit.
  • the determining unit is used to determine the target cell.
  • the first sending unit is configured to send a request message to the target cell, where the request message requests the target cell to reserve resources for the terminal.
  • the receiving unit is configured to receive configuration information from the target cell, where the configuration information includes reserved resources, and valid time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the second sending unit is configured to send the configuration information to the terminal.
  • the resources reserved for the terminal by the potential target cells are delivered to the terminal in advance.
  • the terminal can directly use the resources delivered in advance for uplink data or signaling transmission, which can speed up the uplink data. or signaling transmission.
  • the uplink synchronization information associated with the potential target cell is delivered to the terminal in advance, so that when the cell switched by the terminal is the potential target cell, the terminal can perform uplink data and/or data without using a contention-based random access procedure. or signaling, thereby reducing the upload delay of data and/or signaling.
  • the effective time information corresponding to the resource reserved to the terminal is issued to the terminal in advance. Therefore, after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to provide it to other End use, which can improve resource utilization.
  • the request message includes the information on the effective time of the proposed resource, and/or the proposed uplink synchronization information and/or the information used to determine the uplink synchronization information.
  • the request message sent to the target cell includes the information on the effective time of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information, which can help the target cell to effectively determine the Effective time information corresponding to the resources reserved by the terminal and uplink synchronization information associated with the target cell.
  • the uplink synchronization information includes a timing advance, or different values of measurement parameters and timing advance The mapping relationship between the quantities.
  • the timing advance in the uplink synchronization information, it can advantageously prevent the data and/or signaling uploaded by the UE from interfering with the signal reception of the cell.
  • the terminal can send uplink data and/or signaling using a timing advance that is relatively matched with the actual situation of the terminal, thereby more advantageously avoiding The data and/or signaling uploaded by the terminal interfere with the signal reception of the cell.
  • the measurement parameter includes time information, signal quality of a downlink signal of a cell, a geographic location of the terminal, or a relationship between the terminal and the cell. interval distance.
  • an apparatus for cell handover includes a receiving unit and a sending unit.
  • the receiving unit is configured to receive a request message from the serving cell, where the request message requests the target cell to reserve resources for the terminal.
  • the sending unit is configured to send configuration information to the serving cell, where the configuration information includes reserved resources, and valid time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the resource reserved by the target cell for the terminal is delivered to the terminal by the serving cell. Therefore, after camping on and switching to the target cell, the terminal can directly use the resource for uplink data or signaling transmission, thereby speeding up uplink data or signaling. transmission.
  • the uplink synchronization information associated with the target cell is delivered to the terminal by the serving cell, so that when the cell switched by the terminal is the target cell, the terminal can perform uplink data and/or data without using a contention-based random access procedure. or signaling, thereby reducing the upload delay of data and/or signaling.
  • the effective time information corresponding to the resource reserved for the terminal is delivered to the terminal by the serving cell. Therefore, after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to provide it Used by other terminals, which can improve resource utilization.
  • the request message includes the proposed resource effective time information, and/or the proposed uplink synchronization information and/or the information used to determine the uplink synchronization information.
  • Auxiliary information, the effective time information corresponding to the reserved resources and/or the uplink synchronization information associated with the target cell is based on the effective time information of the proposed resources, and/or, the proposed uplink synchronization information and/or It is set for auxiliary information for determining uplink synchronization information.
  • the effective time information of the resources proposed by the serving cell and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information, it can help the target cell to effectively determine the corresponding resources reserved for the terminal.
  • effective time information and uplink synchronization information associated with the target cell can help the target cell to effectively determine the corresponding resources reserved for the terminal.
  • the receiving unit is further configured to receive uplink information of the terminal, wherein the apparatus is further A registration unit is included for registering the terminal as a terminal for handover to the target cell.
  • the terminal's uplink information is received for the first time, the terminal is registered as a terminal to be handed over to the target cell, so that the target cell can know that the terminal has been handed over to it, so as to send downlink control information and schedule data to the terminal in time.
  • a seventh aspect provides a communication system, the communication system comprising the fifth aspect or the apparatus in any possible implementation manner of the fifth aspect above and the sixth aspect or the apparatus in any possible implementation manner of the sixth aspect above .
  • a communication device comprising a communication interface and a logic circuit, wherein the logic circuit performs the method in the first aspect or any possible implementation manner of the above first aspect, the second aspect or the above second aspect A method of any possible implementation of the aspect, or a method of the third aspect or any of the possible implementations of the third aspect above.
  • a computer-readable storage medium having program instructions stored thereon, the program instructions, when executed by a computer, cause the computer to perform the first aspect or any of the possible implementations of the first aspect above.
  • a ninth aspect provides a computer program comprising program instructions that, when executed by a computer, cause the computer to perform the method of the first aspect or any possible implementation manner of the first aspect above, and the second aspect or a method in any possible implementation of the second aspect above, or, the third aspect or a method in any possible implementation of the third aspect above.
  • a tenth aspect provides a method for cell handover, the method comprising: a terminal receiving at least one configuration information from a serving cell, the at least one configuration information is provided by at least one target cell, and the at least one configuration information includes The resources reserved for the terminal, and the effective time information corresponding to the resources and/or the uplink synchronization information associated with the at least one target cell; the terminal acquires the first target cell to be handed over, the first target cell A target cell is determined under the control of the serving cell; the terminal switches to the first target cell; and the terminal sends uplink information to the first target cell based on the configuration information to notify The terminal has been handed over to the first target cell.
  • the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing data and/or signaling upload delay.
  • the effective time information of the resource reserved for the terminal in the configuration information after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to be used by other terminals. , thereby improving resource utilization.
  • An eleventh aspect provides a method for cell handover, the method comprising: a terminal receiving at least one configuration information from a serving cell, the at least one configuration information is provided by at least one target cell, the at least one configuration information Including resources reserved for the terminal; the terminal acquires a first target cell to be handed over, the first target cell is determined under the control of the serving cell; the terminal switches to the first target cell; And, the terminal sends simplified uplink signaling to the first target cell based on the configuration information, so as to notify the terminal that the terminal has been handed over to the first target cell.
  • the cell can quickly know which cell the terminal is currently in, and send downlink control information and schedule data to the terminal in time. Therefore, the downlink data can still be met while saving the switching signaling overhead of the terminal. fast dispatch/send.
  • a twelfth aspect provides an apparatus for cell handover, the apparatus comprising: a receiving unit configured to receive at least one configuration information from a serving cell, the at least one configuration information is provided by at least one target cell, the The at least one configuration information includes resources reserved for the terminal, and the effective time information corresponding to the resources and/or the uplink synchronization information associated with the at least one target cell; the obtaining unit is configured to obtain the first target to be handed over a cell, the first target cell is determined under the control of the serving cell; a handover unit, configured to switch the terminal to the first target cell; and, a sending unit, configured based on the configuration information Send uplink information to the first target cell to notify the terminal that the terminal has been handed over to the first target cell.
  • the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing data and/or signaling upload delay.
  • the effective time information of the resource reserved for the terminal in the configuration information after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to be used by other terminals. , thereby improving resource utilization.
  • a thirteenth aspect provides an apparatus for cell handover, the apparatus comprising: a receiving unit configured to receive at least one configuration information from a serving cell, the at least one configuration information is provided by at least one target cell, the At least one configuration information includes resources reserved for the terminal; an acquisition unit is used to acquire a first target cell to be handed over, the first target cell is determined under the control of the serving cell; a handover unit is used to the terminal switches to the first target cell; and a sending unit, configured to send simplified uplink signaling to the first target cell based on the configuration information, so as to notify the terminal that the terminal has been switched to the first target community.
  • the cell can quickly know which cell the terminal is currently in, and send downlink control information and schedule data to the terminal in time. Therefore, the downlink data can still be met while saving the switching signaling overhead of the terminal. fast dispatch/send.
  • a fourteenth aspect provides a communication method, the communication method comprising: a terminal receiving configuration information from a serving cell, where the configuration information includes resources reserved by the serving cell for the terminal, and, corresponding to the resources effective time information and/or uplink synchronization information associated with the serving cell; and, the terminal sends uplink data and/or signaling to the serving cell based on the received configuration information.
  • the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing data and/or signaling upload delay.
  • the resource can be released to be used by other terminals. , thereby improving resource utilization.
  • a fifteenth aspect provides a communication device, the communication device includes a receiving unit and a sending unit, wherein the receiving unit is configured to receive configuration information from a serving cell, where the configuration information includes the serving cell to the terminal the reserved resources, and the effective time information corresponding to the resources and/or the uplink synchronization information associated with the serving cell, and the sending unit is configured to send the uplink to the serving cell based on the received configuration information data and/or signaling.
  • the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing data and/or signaling upload delay.
  • the resource can be released to be used by other terminals. , thereby improving resource utilization.
  • a sixteenth aspect provides a communication method, the communication method comprising: determining configuration information corresponding to a terminal, where the configuration information includes resources reserved by the serving cell for the terminal, and validating the corresponding resources time information and/or uplink synchronization information associated with the serving cell; and sending the configuration information to the terminal.
  • the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing data and/or signaling upload delay.
  • the effective time information of the resource reserved for the terminal in the configuration information after the effective time of the resource has elapsed, if the resource is still not used by the terminal, the resource can be released to be used by other terminals. , thereby improving resource utilization.
  • a seventeenth aspect provides a communication device, the communication device includes a determining unit and a sending unit, wherein the determining unit is configured to determine configuration information corresponding to a terminal, the configuration information including the serving cell to the terminal The reserved resources, and the effective time information corresponding to the resources and/or the uplink synchronization information associated with the serving cell, and the sending unit is configured to send the configuration information to the terminal.
  • the terminal can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing data and/or signaling upload delay.
  • the resource can be released to be used by other terminals. , thereby improving resource utilization.
  • a communication device comprising a processor and a memory connected to the processor, wherein the memory stores program instructions, the program instructions when executed by the processor causing the processor to perform the method of the first aspect or any possible implementation of the first aspect above, the method of the second aspect or any possible implementation of the second aspect above, or the third aspect or the above The method in any possible implementation manner of the three aspects.
  • FIG. 1 shows a schematic diagram of cell handover of a UE in a connected state in the prior art
  • FIG. 2 shows a schematic diagram of a signal transmission scenario according to an embodiment of the present application
  • FIG. 3 shows a schematic diagram of the user plane and control plane protocol stacks of the base station and the UE;
  • FIG. 4 shows a schematic diagram of a system architecture according to an embodiment of the present application
  • 5A shows a schematic diagram of a method for cell handover according to the first embodiment of the present application
  • 5B shows a schematic diagram of the steps of selecting a target cell to be handed over according to an embodiment of the present application
  • 5C shows a schematic diagram of the steps of selecting a target cell to be handed over according to an embodiment of the present application
  • 5D shows a schematic diagram of a method for cell handover according to the second embodiment of the present application.
  • 5E shows a schematic diagram of a method for cell handover according to the third embodiment of the present application.
  • FIG. 6A shows a schematic diagram of an apparatus for cell handover according to the first embodiment of the present application
  • FIG. 6B shows a schematic diagram of an apparatus for cell handover according to the second embodiment of the present application.
  • 6C shows a schematic diagram of an apparatus for cell handover according to the third embodiment of the present application.
  • FIG. 7 shows a schematic diagram of a communication system according to an embodiment of the present application.
  • FIG. 8 shows a schematic diagram of a method for cell handover according to the first exemplary implementation of the present application
  • FIG. 9A shows a schematic diagram of a method for uplink data transmission according to a second exemplary implementation of the present application.
  • FIG. 9B shows a schematic diagram of a simplified handover process based on simplified uplink signaling according to an embodiment of the present application.
  • FIG. 9C shows a schematic diagram of an exemplary mapping relationship according to an embodiment of the present application.
  • 10A shows a schematic diagram of a contention-based 4-step random access procedure
  • 10B shows a schematic diagram of a contention-based 2-step random access procedure
  • 10C shows a schematic diagram of a non-contention-based 4-step random access procedure
  • 10D shows a schematic diagram of a non-contention-based 2-step random access procedure
  • 11A shows a schematic diagram of a method for downlink data transmission according to a third exemplary implementation of the present application.
  • FIG. 11B shows a schematic diagram of configuration information delivery according to an embodiment of the present application.
  • FIG. 12A shows a schematic diagram of a method for cell handover according to a fourth exemplary implementation of the present application.
  • FIG. 12B shows a schematic diagram of a method for cell handover according to a fifth exemplary implementation of the present application.
  • FIG. 12C shows a schematic diagram of a communication method in a non-handover scenario according to the sixth exemplary implementation of the present application.
  • FIG. 13 shows a schematic diagram of a communication device according to an embodiment of the present application.
  • FIG. 14 shows a schematic diagram of a communication device according to an embodiment of the present application.
  • first, second, third or similar terms such as module A, module B, module C in the description and the claims are only used to distinguish similar objects and do not represent a specific ordering of objects. Where permitted, the specific order or sequence may be interchanged to enable the embodiments of the application described herein to be practiced in sequences other than those illustrated or described herein.
  • PLMN Public Land Mobile Network, public land mobile network: refers to the operator or network management system. It is a network established and operated by the government or its approved operators (such as mobile operators, Unicom operators or telecom operators, etc.) for the purpose of providing land mobile communication services to the public.
  • LTE Long Term Evolution: refers to the long-term evolution of the UMTS (Universal Mobile Telecommunications System: Universal Mobile Telecommunications System) technical standard formulated by the 3GPP (The 3rd Generation Partnership Project: 3rd Generation Partnership Project).
  • NR refers to the fifth generation (referred to as 5G) wireless access technology, also known as New Radio, its full English name is New Radio Access Technology in 3GPP, also referred to as 5G-NR.
  • eNB Evolved Node B: Evolved Node B: refers to the base station of LTE.
  • gNB refers to the base station of NR.
  • eMBB Enhance Mobile Broadband: Enhanced Mobile Broadband Service
  • 5G the most intuitive feeling brought by 5G in this regard is the substantial increase in network speed. Even when watching 4K high-definition video, the peak value can reach 10Gbps.
  • eMBB refers to high-traffic mobile broadband services such as 3D/UHD video.
  • URLLC Ultra-reliable and Low Latency Communication: ultra-reliable and low-latency communication
  • It is characterized by high reliability, low latency, and extremely high availability. It includes the following scenarios and applications: industrial application and control, traffic safety and control, remote manufacturing, remote training, remote surgery, etc.
  • URLLC has a lot of potential in the driverless business.
  • URLLC is also very important to the security industry.
  • URLLC can refer to services that require low-latency, high-reliability connections, such as autonomous driving and industrial automation.
  • MTC refers to machine-type communication, its full English name is Machine-Type Communication, or M2M for short. MTC features low cost and enhanced coverage.
  • mMTC Massive Machine Type Communication: large-scale machine communication: refers to large-scale Internet of Things business, the main scenarios include the Internet of Vehicles, intelligent logistics, intelligent asset management, etc.
  • IoT refers to the Internet of Things, its full English name is Internet of Things. IoT is an extension and expansion network based on the Internet. It combines various information sensing devices with the Internet to form a huge network, which realizes the interconnection of people, machines and things at any time and any place. IoT includes narrowband IoT.
  • NB-IoT refers to the Narrow Band Internet of Things, its full English name is Narrow Band Internet of Thing.
  • NB-IoT has the characteristics of wide coverage, multiple connections, low speed, low cost, low power consumption, and excellent architecture, such as massive connections, lower power consumption and lower chip cost.
  • NB-IoT can be applied to, for example, smart water meters, smart parking, smart pet tracking, smart bicycles, smart smoke detectors, smart toilets, smart vending machines, wearable devices, etc.
  • D2D refers to device to device, its full English name is Device-to-Device.
  • D2D communication is a new technology that allows terminals to communicate directly by reusing cell resources under the control of the system.
  • CPE Customer Premise Equipment: refers to the mobile signal access equipment that receives mobile signals and forwards them with wireless WIFI signals.
  • the CPE can also be a device that converts high-speed 4G signals or 5G signals into WIFI signals, and the number of mobile UEs that can support simultaneous Internet access is also large.
  • CPE can be widely used in wireless network access in rural areas, towns, hospitals, units, factories, communities, etc., which can save the cost of laying wired networks.
  • AR refers to augmented reality, its full English name is Augmented Reality.
  • VR refers to virtual reality, its full English name is Virtual Reality.
  • V2X refers to the Internet of Vehicles, its full English name is vehicle to everything. V2X is a key technology for future intelligent transportation systems. It enables communication between vehicles, vehicles and base stations, base stations and base stations, and obtains a series of traffic information such as real-time road conditions, road information, and pedestrian information, thereby improving driving safety, reducing congestion, improving traffic efficiency, and providing in-vehicle entertainment information. Wait.
  • FIG. 2 shows a schematic diagram of a signal transmission scenario according to an embodiment of the present application.
  • the signal transmission scenario includes a base station 10 and a UE 20 , wherein the base station 10 is located in a cell and can send a signal to the UE 20 , and the UE 20 can also send a signal to the base station 10 .
  • the base station 10 is a radio base station in the network and also a network element of a radio access network, which may be, for example, an LTE base station eNB, a 5G base station gNB, a satellite, a base station of a future communication system or a base station of other communication systems.
  • a radio access network which may be, for example, an LTE base station eNB, a 5G base station gNB, a satellite, a base station of a future communication system or a base station of other communication systems.
  • the base station 10 may be a macro base station or a small base station, wherein the small base station may be, for example, a micro base station (Micro gNB/NodeB), a pico base station (Pico gNB/NodeB), or a femto base station (Femto gNB/NodeB).
  • a micro base station Mocro gNB/NodeB
  • a pico base station Pico gNB/NodeB
  • Femto gNB/NodeB femto base station
  • the base station 10 may also be a TRP (transmission and receiver point: transceiver node), which may receive signals sent by the UE and/or send signals to the UE.
  • TRP transmission and receiver point: transceiver node
  • the base station 10 is responsible for all functions related to the air interface. Specifically, the base station 10 is responsible for the radio link maintenance function to maintain the radio link with the UE 20, and is also responsible for protocol conversion between radio link data and IP (Internet Protocol: Internet Protocol) data quality monitoring. In addition, the base station 10 is also responsible for radio resource management functions, including establishment and release of radio links, scheduling and allocation of radio resources, and the like. In addition, the base station 10 is also responsible for some mobility management functions, including configuring the UE to perform measurements, evaluating the quality of the UE's radio link, and deciding on the handover of the UE between cells.
  • the base station 10 is responsible for some mobility management functions, including configuring the UE to perform measurements, evaluating the quality of the UE's radio link, and deciding on the handover of the UE between cells.
  • UE 20 may also be referred to as user equipment or mobile station, etc., which may be vehicle-mounted, portable, or handheld, and the like.
  • the physical device of the UE 20 and the mobile user can be completely independent, and all the information related to the user can be stored in a smart card (Subscriber Identity Module: SIM), and the smart card can be used on the UE 20.
  • SIM Subscriber Identity Module
  • the UE 20 can complete the direct air interface interaction with the base station 10 .
  • UE 20 may transmit and/or receive signals.
  • the base station 10 and the UE 20 may respectively include a physical layer (physical layer: PHY), a medium access management layer (Medium Access Control: MAC), a radio link management layer (Radio link control: RLC), and a packet data convergence protocol layer (Packet Data Convergence Protocol: PDCP), service data adaptation protocol layer (Service Data Adaptation Protocol: SDAP) and radio resource control layer (Radio Resource Control: RRC).
  • the base station 10 and the UE 20 may include a user plane protocol and a control plane protocol, respectively.
  • Figure 3 shows a schematic diagram of the user plane and control plane protocol stacks of the base station and the UE.
  • PHY, MAC, RLC and PDCP are located on the user plane and control plane of the base station and UE, SDAP is only located on the user plane of the base station and UE, and RRC is located on the control plane of the base station and UE.
  • the present application is also applicable to a communication scenario between a UE and a UE, a communication scenario between a base station and a base station, a communication scenario between a UE and a satellite, or the Internet of Vehicles, Communication scenarios such as the Internet of Things, Industrial Internet, etc.
  • a communication scenario between UEs at least one UE acts as a regular base station.
  • at least one base station acts as a regular UE, such as a wireless gateway device on a bus.
  • the satellite acts as a regular base station.
  • a base station may include a conventional base station or any other suitable device acting as a conventional base station in communication
  • a UE may include a conventional UE or any other suitable device acting as a conventional UE in communication device of.
  • This application is applicable to both homogeneous network and heterogeneous network scenarios, and there is no limit to the transmission point, which can be multi-point coordinated transmission between macro base station and macro base station, micro base station and micro base station, and macro base station and micro base station.
  • This application is applicable to both FDD (Frequency Division Duplexing: Frequency Division Duplexing) and TDD (Time Division Duplexing: Time Division Duplexing) systems.
  • FDD Frequency Division Duplexing
  • TDD Time Division Duplexing
  • This application is also applicable to low-frequency scenarios, high-frequency scenarios, terahertz scenarios, and optical communication scenarios.
  • This application may be applicable to 5G communication systems, satellite communication systems, future evolved communication systems or other communication systems, etc., which is not limited in this application.
  • FIG. 4 shows a schematic diagram of a system architecture according to an embodiment of the present application.
  • the system architecture shown in FIG. 4 includes a base station 10, a UE 20, and a core network 30, wherein the base station 10 and the UE 20 communicate with each other through an air interface, and the base station 10 and the core network 30 communicate with each other.
  • the base station 10 and the UE 20 have been described in detail above with reference to FIG. 2 and FIG. 3 , and will not be repeated here.
  • a mobile communication network is usually divided into three parts: a base station subsystem, a network subsystem, and a system support part (eg, security management, etc.).
  • the core network 30 is located in the network subsystem, and its main function is to connect call requests or data requests from the air interface to different networks.
  • the core network 30 plays a role of linking the previous and the next, and is mainly responsible for handling the mobility management, session management and data transmission of the UE.
  • the core network 30 mainly provides user connection, user management and bearer connection (Access to), as the bearer network provides an interface to an external network.
  • User connection includes mobility management (Mobility Management: MM), Calling Management (Calling Management: CM), switching/routing, recording notification (complete the connection relationship to the peripheral equipment of the intelligent network in combination with the intelligent network service) and other functions.
  • User management includes user description, quality of service (quality of service: QoS) description (including description of user service QoS), user communication record (Accounting), virtual home environment (Virtual Home Environment: VHE) (with the intelligent network platform)
  • the dialogue provides a virtual home environment), security (corresponding security measures provided by the authentication center include security management of mobile services and security processing of external network access).
  • Bearer connections include to the external public interactive telephone network (Public Switched Telephone Network: PSTN), external circuit data network and packet data network, Internet (Internet), intranet (Intranet), and Short Message Service (Short Message Service: SMS) ) server connection, etc.
  • PSTN Public Switched Telephone Network
  • Internet Internet
  • Intranet Intranet
  • SMS Short Message Service
  • the basic services that the core network can provide include mobile office, e-commerce, communications, entertainment services, travel and location-based services, remote sensing services (Telemetry), and simple messaging services (monitoring and control).
  • the core network 30 may be a 5G core network.
  • the 5G core network has three new enhancements on the basis of the Evolved Packet Core Network (EPC): service-based architecture, support for network slicing, and separation of control and user planes.
  • EPC Evolved Packet Core Network
  • the split architecture includes the separation of network functions, and the separation of control plane and user plane.
  • the separation of network functions absorbs the cloud-native design idea of Network Function Virtualization (NFV), and builds the network in a software-based, modular, and service-based manner.
  • NFV Network Function Virtualization
  • the separation of the control plane and the user plane frees the user plane function from the "centralization" constraint, so that it can be flexibly deployed in the core network as well as in the access network.
  • FIG. 5A shows a schematic diagram of a method for cell handover according to the first embodiment of the present application.
  • the method 500 shown in FIG. 5A includes steps S504-S516.
  • the UE receives at least one configuration information from the serving cell, where the at least one configuration information is provided by at least one target cell.
  • the UE may be in a connected state, an idle state or an inactive state.
  • the at least one target cell may be a cell to which the UE is likely to be handed over.
  • the configuration information at least includes resources reserved by the at least one target cell for the UE, and the resources may include, but are not limited to, at least one of the following: Cell-Radio Network Temporary Identity: C -RNTI), Scheduling Request (SR), Random Access Channel (Random Access Channel: RACH) resources (for example, common preamble (preamble) or dedicated preamble), Signaling Radio Bearer (Signal Radio Bearer: SRB) ) or data radio bearer (Data Radio Bearer: DRB) configuration, resource (grant) or configuration resource (Configured Grant: CG) or resource-free (Grant Free: GF) configuration, secret key, compression algorithm configuration, Physical Layer (Physical Layer) : PHY) and/or Media Access Control (Media Access Control: MAC) and/or Radio Link Control (Radio Link Control: RLC) and/or Packet Data Convergence Protocol (PDCP) and/or Or service data adaptation protocol layer (Service Data Adaptation Protocol: SDAP) configuration, etc.
  • C -RNTI Cell
  • step S508 the UE selects a first target cell to be handed over, wherein the first target cell is one of the at least one target cell.
  • the UE may use one of the first solution, the second solution and the third solution mentioned in step S820 of FIG. 8 to select the target cell to be handed over.
  • step S512 the UE switches to the first target cell according to the selection.
  • step S5166 the UE communicates according to the configuration information corresponding to the first target cell. Through step S516, the first target cell will be informed that the UE has been handed over to it.
  • the UE selects the target cell to be handed over and switches to the selected target cell according to the selection, that is, the UE autonomously selects the cell to be handed over and switches to the selected cell without network control. In this process, the UE does not need to upload
  • the measurement report and the handover command issued by the cell reduce the signaling overhead related to the handover and correspondingly reduce the power consumption of the UE, thus enabling the UE to save energy.
  • step S508 may include steps S5080 and S5082.
  • step S5080 the UE receives the cell reselection parameters delivered by the serving cell.
  • step S5082 the UE performs a cell reselection process based on the received cell reselection parameters to select the first target cell as the cell to be handed over.
  • the UE may use the solution 1 mentioned in step S820 of FIG. 8 to select the cell to be handed over.
  • the UE adopts the cell reselection process to select the cell to be handed over, and can quickly select the cell to be handed over.
  • step S508 may include steps S5084 and S5086.
  • step S5084 the UE measures the signal quality of at least one neighboring cell of the serving cell.
  • step S5086 the UE selects a first neighboring cell from the at least one neighboring cell as the first target cell, wherein the signal quality of the first neighboring cell satisfies a specified measurement event and the first neighboring cell A neighbor cell is one of the at least one target cell.
  • the UE selects the cell to be handed over based on the measurement event, and can accurately select the cell that can be handed over.
  • step S516 further includes: the UE sends uplink data or signaling.
  • the uplink data or signaling may be data or signaling to be uploaded by the UE immediately after the handover, or the uplink data or signaling may be used to notify the UE that the UE has been handed over to the first Simplified UL Signaling of the target cell.
  • the UE notifies that it has switched to the selected target cell by sending uplink data or signaling, so that the selected target cell can quickly know which cell the UE is currently in, and send downlink control information and schedule data to the UE in time. Therefore, the fast scheduling/transmission of downlink data can still be satisfied while saving the switching signaling overhead of the UE.
  • the configuration information includes uplink synchronization information associated with the at least one target cell.
  • the configuration information includes uplink synchronization information associated with the cell, and the UE can transmit uplink data and/or signaling without using the contention-based random access procedure, thereby reducing the time required for uploading data and/or signaling. extension.
  • the configuration information includes reserved resources and valid time information corresponding to the resources.
  • the effective time information may be the effective start time of the resource, or a time period used to indicate the effective start time and effective end time of the resource, or the effective end time of the resource (in this case, for example, but not limited to) , the effective start time of the default resource starts when the resource reservation is successful or the handover command (Handover Command: HO CMD) or conditional handover command (Conditional Handover Command: CHO CMD) is successfully issued to the UE).
  • the resource can be released to provide it for use by other UEs, thereby Improve resource utilization.
  • the uplink synchronization information includes a timing advance.
  • the uplink synchronization information includes the use timing advance, which can advantageously avoid the data and/or signaling uploaded by the UE from interfering with the signal reception of the cell.
  • the uplink synchronization information includes a mapping relationship between different values of measurement parameters and timing advance
  • the uploading of data or signaling by the UE includes: the UE obtains the actual value of the measurement parameter; and, the UE determines the timing advance of the first target cell according to the actual value of the measurement parameter and the mapping relationship associated with the first target cell; and, the UE determines the timing advance according to the determined time
  • the uplink data or signaling is sent in advance.
  • the UE can send the uplink data and/or signaling by using the timing advance that is relatively matched with the actual situation of the UE, so that it can be more advantageous Therefore, the data and/or signaling uploaded by the UE can be prevented from interfering with the signal reception of the cell.
  • the measurement parameters include at least one of the following: time information, signal quality of downlink signals of the first target cell and/or one or more neighboring cells thereof, the geographic location of the UE, and The separation distance between the UE and the first target cell.
  • the measurement parameters may be of a single cell or of multiple cells, such as serving cell only, single neighbor cell only, multiple neighbor cells, serving cell and multiple neighbor cells It can also be a measurement parameter of UE granularity (such as UE location).
  • the method may further include step S520.
  • step S520 while or after sending the uplink data or signaling, the UE sends at least one of the following to the first target cell: the identity of the serving cell and the fact that the UE is in the serving cell ; information of the at least one target cell; and a message for requesting configuration information of more target cells of the UE.
  • the information of the at least one target cell may be, for example, but not limited to, the at least one configuration information provided by the at least one target cell received by the UE from the serving cell.
  • the first target cell can obtain data related to the UE from the serving cell (eg, , the downlink data that the serving cell has received but has not yet successfully sent to the UE, the uplink data that the serving cell has successfully received from the UE but has not yet successfully forwarded to the core network element and/or the UE context information, etc.), so as to send the downlink data of the UE backlogged in the serving cell to the UE to ensure that no packet loss occurs.
  • data related to the UE eg, the downlink data that the serving cell has received but has not yet successfully sent to the UE, the uplink data that the serving cell has successfully received from the UE but has not yet successfully forwarded to the core network element and/or the UE context information, etc.
  • the first target cell can determine whether the UE needs more configuration information of the target cell, and deliver it to the UE in advance when necessary More configuration information of the target cell, so as to avoid the UE frequently asking for the configuration information of the target cell during the moving process.
  • the first target cell can deliver the configuration information to the UE in advance before the UE switches to other cells. Configuration information of the multi-target cell.
  • the at least one target cell when the at least one target cell is plural, the at least one target cell includes at least two target cells for serial handover.
  • the target cell of the serial handover refers to the cell to which the UE continues the handover (for example, assuming that the at least two target cells of the serial handover are the target cells B1, B2 and B3, the serial handover refers to: the UE first switches from the target cell to the target cell B3. B1 is handed over to B2, and then when appropriate, the UE is handed over from the target cell B2 to B3).
  • the UE already has configuration information of the target cells for subsequent serial handovers in advance, and after each time the UE completes access to a new target cell, the original The received configuration information of the target cell of the serial handover is not discarded, and the configuration information is not discarded until the valid time corresponding to the configuration information expires. Therefore, the UE can be prevented from frequently requesting the configuration information of the target cell.
  • the method may further include step S524.
  • step S524 before or after handover to the first target cell, the UE sends notification information to the serving cell, the notification information indicating that the UE has been handed over to another cell.
  • the UE sends notification information to the serving cell to indicate that the UE has handed over to another cell.
  • HO CMD handover command
  • CHO CMD conditional handover command
  • the UE sends notification information to the serving cell to indicate that the UE has been handed over to another cell.
  • the original serving cell can disconnect the connection with the original serving cell in time to stop downlink scheduling for the UE and release the allocated
  • the resources given to the UE are used by other UEs, which can improve resource utilization.
  • FIG. 5D shows a schematic diagram of a method for cell handover according to the second embodiment of the present application.
  • the method 530 shown in FIG. 5D can be performed by, for example, but not limited to, the serving cell of the UE.
  • Method 530 may include steps S534-S546.
  • the serving cell determines the target cell.
  • the target cell is a cell that the UE may hand over.
  • the target cell can be determined according to the movement trajectory of the UE and the like.
  • the serving cell sends a request message to the target cell, where the request message requests the target cell to reserve resources for the UE.
  • the resources may include, for example, C-RNTI, SR, RACH resources (eg, public or dedicated preamble, etc.), SRB or DRB configuration, grant or CG or GF configuration, secret key, compression algorithm configuration, PHY and/or Or MAC and/or RLC and/or PDCP and/or SDAP configuration, etc.
  • the serving cell receives configuration information from the target cell, the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink associated with the target cell Synchronization information.
  • the effective time information may be the effective start time of the resource, or the effective end time of the resource, or a time period used to indicate the effective start time and the effective end time of the resource.
  • step S546 the serving cell sends the configuration information to the UE.
  • the resources reserved by the potential target cells for the UE are delivered to the UE in advance, so the UE can directly use the resources delivered in advance to perform uplink data or signaling after camping on and switching to these potential target cells. order transmission, so as to speed up the transmission of uplink data or signaling.
  • the uplink synchronization information associated with the potential target cell is delivered to the UE in advance, so that when the cell switched by the UE is the potential target cell, the UE does not need to use contention-based random access In this process, uplink data and/or signaling can be transmitted, thereby reducing the upload delay of data and/or signaling.
  • the effective time information corresponding to the resource reserved to the UE is delivered to the UE in advance. Therefore, after the effective time of the resource has elapsed, if the resource is still not used by the UE, it can be released. This resource can be provided to other UEs for use, which can improve resource utilization.
  • the request message may include the effective time information of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information.
  • the effective time information of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information it can help the target The cell effectively determines the effective time information corresponding to the resources reserved for the UE and the uplink synchronization information associated with the target cell.
  • the uplink synchronization information may include a timing advance, or a mapping relationship between different values of the measurement parameter and the timing advance.
  • the uplink synchronization information includes the use timing advance, which can advantageously avoid the data and/or signaling uploaded by the UE from interfering with the signal reception of the cell.
  • the UE can send the uplink data and/or signaling by using the timing advance that is relatively matched with the actual situation of the UE, so that it can be more advantageously avoided.
  • the data and/or signaling uploaded by the UE interferes with the signal reception of the cell.
  • the measurement parameters include time information, signal quality of downlink signals of the cell, geographic location of the UE, or separation distance between the UE and the cell.
  • FIG. 5E shows a schematic diagram of a method for cell handover according to the third embodiment of the present application.
  • the method 560 shown in FIG. 5E can be performed by, for example, but not limited to, a target cell that the UE may hand over.
  • Method 560 may include steps S564-S576.
  • step S564 the target cell receives a request message from the serving cell, the request message requesting the target cell to reserve resources for the UE.
  • step S568 the target cell sends configuration information to the serving cell, where the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink associated with the target cell Synchronization information.
  • the resource reserved by the target cell for the UE is delivered to the UE by the serving cell, so the UE can directly use the resource for uplink data or signaling transmission after camping on and switching to the target cell, Thus, the transmission of uplink data or signaling can be accelerated.
  • the uplink synchronization information associated with the target cell is provided by the target cell to the serving cell and then sent to the UE. Therefore, when the cell to be switched by the UE is the target cell, the UE does not need to use the contention-based In the random access process, uplink data and/or signaling can be transmitted, thereby reducing the upload delay of data and/or signaling.
  • the effective time information corresponding to the resource reserved for the UE is provided by the target cell to the serving cell and then sent to the UE. Therefore, after the effective time of the resource has elapsed, if the resource has not been If it is used by the UE, the resource can be released to be used by other UEs, which can improve resource utilization.
  • the request message includes the effective time information of the proposed resources, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information, and the corresponding information of the reserved resources
  • the effective time information and/or the uplink synchronization information associated with the target cell is based on the effective time information of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information. set.
  • Effective time information corresponding to the resource and uplink synchronization information associated with the target cell by using the effective time information of the resources proposed by the serving cell, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information.
  • the method 560 may further include steps S572-S576.
  • step S572 the uplink information of the UE is received, where, for example, the uplink information may be uplink data and/or signaling to be uploaded immediately after the UE switches to the target cell, or the uplink information may be, for example, It may be simplified uplink signaling for notifying the UE that the UE has been handed over to the target cell.
  • step S576 the UE is registered as a UE handed over to the target cell.
  • the UE when the UE's uplink information is received for the first time, the UE is registered as the UE to be handed over to the target cell, so that the target cell can know that the UE has been handed over to it, so as to send downlink control information and schedule data to the UE in time.
  • FIG. 6A shows a schematic diagram of an apparatus for cell handover according to the first embodiment of the present application.
  • the apparatus 600 shown in FIG. 6A can be implemented by, for example, but not limited to, the UE 20 or any other suitable device.
  • the apparatus 600 may include a receiving unit 604 , a selecting unit 608 , a switching unit 612 and a communication unit 616 .
  • the receiving unit 604 is configured to receive at least one configuration information from the serving cell, where the at least one configuration information is provided by at least one target cell.
  • the selection unit 608 is configured to select a first target cell to be handed over, wherein the first target cell is one of the at least one target cell.
  • the switching unit 612 is configured to switch to the first target cell according to the selection.
  • the communication unit 616 is configured to communicate according to the configuration information corresponding to the first target cell.
  • the receiving unit 604 may be further configured to receive cell reselection parameters delivered by the serving cell
  • the selecting unit 608 may be further configured to perform a cell reselection process based on the received cell reselection parameters to select the selected cell reselection parameters.
  • the first target cell is described as the cell to be handed over.
  • the apparatus 600 may further include a measuring unit 620 configured to measure the signal quality of at least the neighboring cells of the serving cell, wherein the selecting unit 608 is further configured to determine the signal quality of at least the first neighboring cell such that the specified measurement event is satisfied and the first neighbor cell is one of the at least one target cell, and the first neighbor cell is selected as the first target cell.
  • a measuring unit 620 configured to measure the signal quality of at least the neighboring cells of the serving cell
  • the selecting unit 608 is further configured to determine the signal quality of at least the first neighboring cell such that the specified measurement event is satisfied and the first neighbor cell is one of the at least one target cell, and the first neighbor cell is selected as the first target cell.
  • the communication unit 616 may be further configured to transmit uplink data or signaling.
  • the configuration information may include uplink synchronization information associated with the at least one target cell.
  • the configuration information may include: reserved resources and valid time information corresponding to the resources.
  • the uplink synchronization information may include a timing advance.
  • the uplink synchronization information may include a mapping relationship between different values of the measurement parameter and the timing advance
  • the apparatus 600 may further include an obtaining unit 624 for obtaining the actual value of the measurement parameter, and a The determining unit 628 for determining the timing advance of the first target cell according to the actual value of the measurement parameter and the mapping relationship associated with the first target cell, wherein the communication unit 616 may be further configured to The uplink data or signaling is sent with the determined timing advance.
  • the measurement parameters may include at least one of the following: time information, signal quality of downlink signals of the first target cell and/or one or more of its neighboring cells, the geographic location of the UE, and the UE's The separation distance from the first target cell.
  • the communication unit 616 may be further configured to send at least one of the following to the first target cell while or after sending the uplink data or signaling: the identity of the serving cell and the UE An identity in the serving cell; information of the at least one target cell; and a message for requesting configuration information of more target cells of the UE.
  • the at least one target cell when the at least one target cell is plural, the at least one target cell includes at least two target cells for serial handover.
  • the apparatus 600 may further include a sending unit 632, configured to send notification information to the serving cell before or after the handover to the first target cell, the notification information indicating that the UE has been handed over to the first target cell. another neighborhood.
  • FIG. 6B shows a schematic diagram of an apparatus for cell handover according to the second embodiment of the present application.
  • the apparatus 650 shown in FIG. 6B can be implemented by, for example, but not limited to, the base station of the serving cell of the UE or any other suitable device.
  • the apparatus 650 may include a determining unit 654 , a first sending unit 658 , a receiving unit 662 and a second sending unit 666 .
  • the determining unit 654 is used for determining the target cell.
  • the first sending unit 658 is configured to send a request message to the target cell, where the request message requests the target cell to reserve resources for the UE.
  • the receiving unit 662 is configured to receive configuration information from the target cell, where the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the second sending unit 666 is configured to send the configuration information to the UE.
  • the request message may include the effective time information of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information.
  • the uplink synchronization information may include a timing advance, or a mapping relationship between different values of the measurement parameter and the timing advance.
  • the measurement parameter may include time information, the signal quality of the downlink signal of the cell, the geographic location of the UE, or the separation distance between the UE and the cell.
  • FIG. 6C shows a schematic diagram of an apparatus for cell handover according to the third embodiment of the present application.
  • the apparatus 680 shown in FIG. 6C can be implemented by, for example, but not limited to, the base station of the target cell to which the UE is likely to be handed over or any other suitable device.
  • the apparatus 680 may include a receiving unit 684 and a sending unit 688 .
  • the receiving unit 684 is configured to receive a request message from the serving cell, where the request message requests the target cell to reserve resources for the UE.
  • the sending unit 688 is configured to send configuration information to the serving cell, where the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the request message includes the effective time information of the proposed resources, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information, and the corresponding information of the reserved resources
  • the effective time information and/or the uplink synchronization information associated with the target cell is based on the effective time information of the proposed resource, and/or the proposed uplink synchronization information and/or the auxiliary information for determining the uplink synchronization information. set.
  • the receiving unit 684 may also be configured to receive uplink information of the UE, wherein the apparatus 680 further includes a registration unit 692 configured to register the UE as a UE that is handed over to the target cell.
  • FIG. 7 shows a schematic diagram of a communication system according to an embodiment of the present application.
  • the communication system 700 may include the apparatus 650 shown in FIG. 6B and the apparatus 680 shown in FIG. 6C.
  • FIG. 8 shows a schematic diagram of a method for cell handover according to the first exemplary implementation of the present application. As shown in FIG. 8, the method 800 for cell handover includes steps S804-S824.
  • the serving cell 100 determines the target cells 110-1, 110-2, . . . , 110-N of the UE 20 in the connected state.
  • N is a positive integer.
  • the target cells 110-1, 110-2, . . . , 110-N are cells that the UE 20 may switch to, and the number of which may be one or more.
  • the serving cell 100 can predict the target cells 110-1, 110-2, .
  • step S808 the serving cell 100 sends a handover preparation (HO preparation) message to the target cells 110-1, 110-2, ..., 110-N, respectively.
  • the handover preparation message requests the target cell to reserve resources for the UE 20.
  • the target cells 110-1, 110-2, ..., 110-N respectively send a handover preparation response (HO preparation response) including configuration information to the serving cell 100.
  • the configuration information sent by the target cells 110-1, 110-2, . . . , 110-N may be the same or different.
  • the configuration information may only include resources reserved for UE 20.
  • the reserved resources may include, for example, but not limited to, at least one of the following: C-RNTI, SR, RACH resources (eg, public or dedicated preamble, etc.), SRB or DRB configuration, grant or CG or GF configuration , key, compression algorithm configuration, PHY and/or MAC and/or RLC and/or PDCP and/or SDAP configuration, etc.
  • the configuration information may include resources reserved for the UE 20, as well as valid time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the effective time information may be, for example, the effective start time of the reserved resources, or, the time period during which the reserved resources are effective, and the time period is defined by the effective start time and the effective end time, or, the reserved resources
  • the effective end time (in this case, for example, but not limited to, the effective start time of the default resource starts from the successful resource reservation or the successful issuance of a handover command (HO CMD) or conditional handover command (CHO CMD) to the UE ).
  • the configuration information may include one or more sets of resources reserved for the UE 20, and each set of resources may correspond to the same or different effective time information.
  • the uplink synchronization information may be, for example, a timing advance (Timing Advance: TA), or a mapping relationship between different values of measurement parameters and TA.
  • the measurement parameters may include, for example, but not limited to, one or more of the following: time information, signal quality of downlink signals of the serving cell and/or one or more of its neighbor cells, the geographic location of the UE, and the distance between the UE and the cell distance etc.
  • the time information may refer to, for example, the time, minutes, seconds, and the like.
  • the signal quality of the downlink signal may be, for example, a reference signal received power (Reference Signal Received Power: RSRP) value, a reference signal received quality (Reference Signal Receiving Quality: RSRQ) value, a signal to interference plus noise ratio (Signal to Interference plus Noise Ratio: SINR) value, Channel Quality Indication (Channel Quality Indication: CQI) value and/or Channel State Information (Channel State Information: CSI) value.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Receiving Quality
  • SINR Signal to interference plus noise ratio
  • SINR Signal to interference plus noise ratio
  • CQI Channel Quality Indication
  • CSI Channel State Information
  • the signal quality of the downlink signal may be, for example, but not limited to, a single cell, a single beam, and/or multiple cells and/or beams.
  • the signal quality of the downlink signal may be obtained, for example, but not limited to, based on one or more of the following measurements: a synchronization signal block (Synchronization Signal Block: SSB), a channel state information reference signal (Channel State Information-Reference Signal: CSI-RS) and A demodulation reference signal (Demodulation Reference Signal: DMRS), etc.
  • SSB Synchronization Signal Block
  • CSI-RS Channel State Information-Reference Signal
  • DMRS demodulation Reference Signal
  • the effective time information of the resources reserved for the UE 20 can be set with reference to the effective time information of the proposed resources.
  • the request message sent by the serving cell 100 to the target cells 110-1, 110-2, . -1, 110-2, ..., 110-N may refer to the proposed uplink synchronization information and/or auxiliary information to set the uplink synchronization information associated with the target cell.
  • the auxiliary information for determining the uplink synchronization information may include, but is not limited to, one or more of the following: the position, speed, moving direction and/or altitude information of the UE 20; the information of the serving cell 100 and/or its neighboring cells Downlink RSRP; and TA from UE 20 to serving cell 100, etc.
  • the serving cell 100 delivers the configuration information received from the target cells 110-1, 110-2, . . . , 110-N to the UE 20 by means of the base station of the serving cell 100.
  • the serving cell 100 may issue the configuration information to the UE 20 in advance through a handover command (HO CMD) or a conditional handover command (CHO CMD) before the UE 20 performs cell handover.
  • HO CMD handover command
  • CHO CMD conditional handover command
  • the serving cell 100 may also deliver the identification information of the target cells 110-1, 110-2, . -2, ..., 110-N frequency points, cell list and/or beam list, etc.
  • step S820 after receiving the configuration information issued by the serving cell 100 and, optionally, the identification information of the target cells 110-1, 110-2, ..., 110-N, the UE 20 does not have network control
  • the target cell to be handed over is autonomously selected, and handed over to the autonomously selected target cell.
  • the autonomously selected target cell is hereinafter referred to as the target cell 110-i.
  • the UE 20 may autonomously select the target cell 110-i to be handed over using, but not limited to, one of three schemes.
  • the UE 20 automatically selects the target cell to be handed over by performing a cell reselection (Cell Re-selection) process performed by the UE in the idle state. Specifically, the UE 20 first receives the cell reselection parameters delivered by the serving cell 100.
  • the cell reselection parameter can be, for example, a related parameter included in the system information block (System Information Block: SIB) 2 in the system information delivered by the serving cell 100 via the broadcast channel, and the related parameter has been described in 3GPP TS38.331 V16. It is described in detail in the 2.0 protocol and will not be repeated here.
  • SIB System Information Block
  • the cell reselection parameter may be, for example, a cell reselection-related parameter delivered to the UE 20 by the serving cell 100 in the Radio Resource Control (Radio Resource Control: RRC) configuration. Then, the UE 20 performs a cell reselection procedure using the received cell reselection parameters to find neighboring cells in which the UE 20 can camp. For example, the RSRPs of neighboring cells of the serving cell 100 may be measured during the cell reselection process, and then the neighboring cells that the UE 20 can camp on are determined based only on the measured RSRPs of the neighboring cells.
  • RRC Radio Resource Control
  • the RSRPs of the serving cell 100 and its neighboring cells may be measured during the cell reselection process, and then based on the measured RSRPs of the serving cell 100 and its neighboring cells, the neighboring cells in which the UE 20 can camp is determined (for example, Neighboring cells that satisfy the A3 event, i.e., neighboring cells whose RSRP is x dB higher than that of the serving cell 100).
  • the UE 20 selects a suitable adjacent cell from the found adjacent cells as the target cell to be handed over.
  • the suitable neighbor cell may be, for example, the neighbor cell with the best signal quality or the highest priority.
  • the suitable neighbor cell may be, for example, the neighbor cell with the best signal quality or the highest priority.
  • the suitable neighbor cell may be, for example, the neighbor cell with the best signal quality or the highest priority.
  • the suitable neighbor cell may be, for example, the neighbor cell with the best signal quality or the highest priority.
  • the suitable neighbor cell may be, for example, the neighbor cell with the best
  • the UE 20 measures the signal quality of at least one adjacent cell of the serving cell 100, or measures the signal quality of the serving cell 100 and at least one adjacent cell thereof.
  • the UE 20 checks whether there is a measurement event whose signal quality meets the specified measurement event in the at least one neighboring cell and which is one of the target cells 110-1, 110-2, . . . , 110-N. If the check result is positive, the UE 20 selects the adjacent cell that satisfies the condition as the target cell to be handed over.
  • the specified measurement event is notified to the UE 20 in advance by the serving cell 100, which may be, for example, but not limited to one or more of the following measurement events: A1 event, A2 event, A3 event, A4 event, A5 event, A6 event Events, B1 Events and B2 Events.
  • the A1 event indicates that the signal quality of the serving cell becomes higher than the threshold value
  • the A2 event indicates that the signal quality of the serving cell becomes lower than the threshold value
  • the A3 event indicates that the neighbor cell is higher than the main serving cell
  • the A4 event indicates that the neighbor cell
  • the signal quality of the cell is higher than the threshold value
  • the A5 event indicates that the signal quality of the serving cell is lower than the threshold value 1 and the signal quality of the neighboring cell is higher than the threshold value 2
  • the A6 event indicates that the neighboring cell is higher than the main serving cell
  • the B1 event Indicates that the signal quality of the inter-system neighbor cell is higher than the threshold value
  • the B2 event indicates that the primary serving cell quality is lower than the threshold value and the signal quality of the inter-system neighbor cell is higher than the threshold value.
  • A1-A6 events and B1-B2 events have been described in detail in the 3GPP TS38.331 V16.2.0 protocol, for example, and will not be repeated here.
  • solution 3 different from solutions 1 and 2 above, the network does not issue any parameters to affect the UE. Therefore, how the UE selects the target cell to be handed over is completely determined by the UE.
  • the UE20 switches the target cell 110-i, if the target cell 110-i is one of the target cells 110-1, 110-2, . . . , 110-N, the UE20 has a configuration corresponding to the target cell 110-i Therefore, UE20 obtains information such as C-RNTI and secret key of target cell 110-i in advance. Therefore, after handover to target cell 110-i, UE20 can directly monitor downlink control information of this cell to receive downlink data.
  • step S824 the UE 20 communicates with the autonomously selected target cell 110-i to inform the UE 20 that it has been handed over to the target cell 110-i.
  • the target cell 110-i can then directly use the allocated C-RNTI and related resources to perform downlink data transmission and downlink control information scheduling for the UE 20.
  • the UE autonomously selects the target cell to be handed over and switches to the autonomously selected target cell.
  • the UE does not need to upload the measurement report and the cell to issue the handover instruction, etc. Therefore, with Compared with the handover controlled by the existing network, the signaling overhead required for the handover is reduced, and the UE can save energy.
  • FIG. 9A shows a schematic diagram of a method for uplink data transmission according to the second exemplary implementation of the present application.
  • the method 900 shown in FIG. 9A is an exemplary implementation of step S824 shown in FIG. 8 .
  • the method 900 may include steps S904-S920.
  • step S904 after switching to the autonomously selected target cell 110-i, the UE 20 sends uplink information to the base station of the target cell 110-i to inform the UE 20 that it has switched to the target cell 110-i.
  • the uplink information may be the uplink data and/or signaling to be uploaded by the UE 20 immediately.
  • the uplink information may be a simplified uplink signaling (Simplified UL Signaling).
  • 9B shows a schematic diagram of a simplified handover process based on simplified uplink signaling according to an embodiment of the present application, wherein when the UE is handed over from cell 1 to cell 2, from cell 2 to cell 3, and from cell 3 to cell At 4:00, if the UE has no uplink data and/or signaling to upload immediately after the handover, the UE will send simplified uplink signaling to the target cell of the handover to inform the UE that the handover target cell has been handed over.
  • the simplified uplink signaling can be, for example, but not limited to one of the following: a dedicated preamble, a dedicated sounding reference signal (Sounding Reference Signal: SRS), a dedicated scheduling request (Scheduled Request: SR), a configuration resource (Configured Grant: Uplink Control Indication (UCI) sent by CG) or resource-free (Grant Free: GF), MAC control element (Control Element: CE) sent by CG or GF, Radio Resource Control (Radio Resource) sent by CG or GF Control: RRC) message, common random access channel message containing UE identity (eg, C-RNTI), common SRS containing UE identity, common SR containing UE identity, and resource message (Grant) containing UE identity.
  • SRS Sounding Reference Signal
  • SR dedicated scheduling request
  • a configuration resource Configured Grant: Uplink Control Indication (UCI) sent by CG) or resource-free (Grant Free: GF)
  • MAC control element Control element sent by CG or GF
  • the UE 20 faces the following situations when sending uplink information to the target cell 110-i.
  • the target cell 110-i is one of the target cells 110-1, 110-2, . . . , 110-N, and the serving cell 100 delivers the target cell 110-i of the UE 20 in advance
  • the corresponding configuration information only includes the resources reserved for the UE 20, but does not include the effective time information corresponding to the reserved resources and the uplink synchronization information associated with the target cell 110-i.
  • the UE 20 uses the reserved resources to communicate to the target cell 110-i through a non-contention-based random access procedure (eg, the non-contention-based random access procedure shown in FIG. 10C or FIG. 10D ). Send upstream information.
  • the target cell 110-i is one of the target cells 110-1, 110-2, . . . , 110-N, and the serving cell 100 delivers the target cell 110-i of the UE 20 in advance
  • the corresponding configuration information includes the resources reserved for the UE 20 and the effective time information corresponding to the reserved resources, but does not include the uplink synchronization information associated with the target cell 110-i.
  • the UE 20 first determines whether the reserved resource is currently effective based on the effective time information corresponding to the reserved resource. If valid, UE 20 sends uplink information to target cell 110-i through a non-contention-based random access procedure (eg, the non-contention-based random access procedure shown in FIG. 10C or FIG. 10D ) using the reserved resources . If not valid, the UE 20 sends uplink information to the target cell 110-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • the target cell 110-i is one of the target cells 110-1, 110-2, . . . , 110-N, and the serving cell 100 delivers the target cell 110-i of the UE 20 in advance
  • the corresponding configuration information includes the resources reserved for the UE 20 and the uplink synchronization information associated with the target cell 110-i, but does not include the effective time information corresponding to the reserved resources (in this case, it is reserved for the UE 20 by default. resources are always in effect).
  • the UE 20 uses the reserved resources to send uplink information to the target cell 110-i based on the uplink synchronization information.
  • the UE 20 uses the reserved resources to send uplink information to the target cell 110-i according to the TA.
  • the UE 20 If the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA, the UE 20 first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved The resource of 110-i sends uplink information to the target cell 110-i according to the retrieved TA.
  • FIG. 9C shows a schematic diagram of an exemplary mapping relationship according to an embodiment of the present application.
  • the measurement parameter is downlink RSRP
  • UE 20 first measures the actual value of downlink RSRP.
  • the target cell 110-i is one of the target cells 110-1, 110-2, . . . , 110-N, and the serving cell 100 delivers the target cell 110-i of the UE 20 in advance
  • the corresponding configuration information includes resources reserved for the UE 20, effective time information corresponding to the reserved resources, and uplink synchronization information associated with the target cell 110-i.
  • the UE 20 first determines whether the reserved resource is currently effective based on the effective time information corresponding to the reserved resource. If not valid, the UE 20 sends uplink information to the target cell 110-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • the UE 20 sends uplink information to the target cell 110-i based on the uplink synchronization information using the reserved resources.
  • the uplink synchronization information is a TA
  • the UE 20 uses the reserved resources to send uplink information to the target cell 110-i according to the TA.
  • the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA
  • the UE 20 first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved
  • the resource of 110-i sends uplink information to the target cell 110-i according to the retrieved TA.
  • the target cell 110-i is not the target cell 110-1, 110-2, . . . , 110-N.
  • the UE 20 sends uplink information to the target cell 110-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • step S908 after receiving the uplink information sent by the UE 20, the target cell 110-i registers the UE 20 as a UE that has been handed over to the target cell 110-i.
  • the target cell 110-i allocates corresponding resources to the UE 20.
  • the method 900 may further include steps S912 and S916.
  • step S912 while or after the UE 20 sends the uplink information, the UE 20 sends a request message to the base station of the target cell 110-i to request the target cell 110-i to allocate resources to the UE 20.
  • step S916 after receiving the request message from the UE 20, the target cell 110-i allocates corresponding resources to the UE 20.
  • the method 900 may further include step S920.
  • step S920 before or after the handover to the target cell 110-i, the UE 20 sends notification information to the base station of the serving cell 100 to notify the UE 20 that the handover to the target cell 110-i has occurred.
  • the UE 20 sends notification information to the serving cell 100 to indicate that the UE 20 has handed over to another cell.
  • HO CMD handover command
  • CHO CMD handover command
  • the UE 20 sends notification information to the serving cell 100 to indicate that the UE 20 has handed over to another cell.
  • the UE 20 sends the The serving cell 100 sends notification information to indicate that the UE 20 has been handed over to another cell.
  • the serving cell 100 can be disconnected from the original serving cell in time to stop downlink scheduling for the UE and release the resources allocated to the UE 20 for use by other UEs, thereby improving resource utilization.
  • the UE since the resources reserved by the potential target cells for the UE are delivered to the UE in advance, the UE can directly use the resources delivered in advance after camping on and switching to these potential target cells. Uplink data or signaling transmission, so that the transmission of uplink data or signaling can be accelerated.
  • the UE sends uplink information (for example, uplink data and/or signaling to be uploaded by the UE immediately, or simplified uplink signaling ( simplified UL signaling)), so that the new cell can quickly know which cell the UE is currently in, and send downlink control information and data scheduling to the UE in time. Therefore, it can still meet the downlink requirements while saving the UE's handover signaling overhead. Fast scheduling/sending of data.
  • uplink information for example, uplink data and/or signaling to be uploaded by the UE immediately, or simplified uplink signaling ( simplified UL signaling)
  • FIG. 10A shows a schematic diagram of a contention-based 4-step random access procedure.
  • the contention-based 4-step random access procedure includes steps S1000-S1012.
  • the UE sends a random access preamble (Random Access Preamble) (ie, message 1, Msg1) to the base station gNB of the cell.
  • the base station gNB of the cell sends a random access response (Random Access Response: RAR) (ie, message 2, Msg2) to the UE.
  • RAR Random Access Response
  • the UE performs the first uplink transmission (ie, message 3, Msg3) on the uplink shared channel.
  • the base station gNB of the cell sends a contention resolution message (ie, message 4, Msg4) to the UE.
  • FIG. 10B shows a schematic diagram of a contention-based 2-step random access procedure.
  • the contention-based 2-step random access procedure includes steps S1020-S1024.
  • the UE sends a random access preamble (Random Access Preamble) and a physical uplink shared channel (Physical Uplink Shared Channel: PUSCH) data (that is, message A, Msg A) to the base station gNB of the cell.
  • the base station gNB of the cell sends a contention resolution message (ie, message B, Msg B) to the UE.
  • a contention resolution message ie, message B, Msg B
  • FIG. 10C shows a schematic diagram of a non-contention based 4-step random access procedure.
  • the non-contention-based 4-step random access procedure includes steps S1040-S1052.
  • the base station of the cell assigns a non-contention random access preamble (ie, message 0, Msg0) to the UE through downlink dedicated signaling.
  • the UE transmits the assigned random access preamble (Msg1) on the RACH.
  • the base station gNB of the cell transmits the RAR (Msg2) to the UE.
  • the UE performs the first uplink transmission on the uplink shared channel (Msg3).
  • FIG. 10D shows a schematic diagram of a non-contention based 2-step random access procedure.
  • the non-contention-based 2-step random access procedure includes steps S1070-S1078.
  • step S1070 the base station of the cell assigns a non-contention random access preamble and PUSCH (ie, message 0, Msg0) to the UE through downlink dedicated signaling.
  • step S1074 the UE sends the assigned random access preamble and uplink data (Msg A) on the RACH.
  • the base station gNB of the cell sends the RAR (Msg B) to the UE.
  • FIG. 11A shows a schematic diagram of a method for downlink data transmission according to a third exemplary implementation of the present application.
  • the method 1100 shown in FIG. 11A may include steps S1104-S1116.
  • the UE 20 transmits to the target cell 110-i the identity of the serving cell 100 and where the UE 20 is An identity in the serving cell 100 (eg, C-RNTI, etc.).
  • step S1108 after receiving the identity of the serving cell 100 and the identity of the UE 20 in the serving cell 100, the target cell 110-i initiates a UE Context Fetch process, and sends a request message to the serving cell 100 to request and UE 20 related data.
  • the data related to the UE 20 may include, for example, but not limited to, downlink data that the original serving cell 100 has received but has not yet successfully sent to the UE 20, the original serving cell 100 has successfully received from the UE 20 but has not been successfully forwarded to the core network.
  • step S1112 after receiving the request message from the target cell 110-i, the serving cell 100 sends the data related to the UE 20 to the target cell 110-i.
  • step S1116 after receiving the data related to the UE 20, if the data related to the UE 20 includes downlink data to be sent to the UE 20, the target cell 110-i sends the downlink data to the UE 20.
  • Steps S1104 to S1116 when the UE moves away from the original serving cell and switches to another cell during data transmission, the downlink data of the UE backlogged in the original serving cell can be sent to the UE to ensure that no packet loss occurs Phenomenon. Steps S1104-S1116 are optional.
  • the method 1100 may further include steps S1120-S1128, so that the UE 20 can ask the current serving cell (ie, the target cell 110-i) for more configuration information of the potential target cell.
  • step S1120 the UE 20 sends a request message to the target cell 110-i to request more configuration information of the target cell.
  • the target cell 110-i negotiates with one or more target cells that the UE 20 may hand over to obtain configuration information corresponding to the one or more target cells.
  • the configuration information includes resources reserved for UE20.
  • the configuration information includes resources reserved for the UE 20, and valid time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • step S1128 the target cell 110-i sends the configuration information corresponding to the one or more target cells to the UE 20.
  • the method 1100 may further include steps S1132 to S1140 to configure the UE20 with more configuration information of potential target cells.
  • step S1132 the target cell 110-i obtains the configuration information corresponding to the target cells 110-1, 110-2, . . . , 110-N previously delivered to the UE20. For the configuration information corresponding to the target cells 110-1, 110-2, . get.
  • step S1136 after obtaining the configuration information corresponding to the target cells 110-1, 110-2, .
  • step S1140 if the determination result of step S736 is positive, the target cell 110-i acquires more configuration information corresponding to the target cell and delivers it to the UE20.
  • cell 1 delivers the configuration information of target cells 2, 3 and 4 to the UE in advance.
  • the target cell 4 obtains the target cell 2, 3 and 4, if it is judged that the UE may move to target cells 5 and 6 in the future, but the UE does not have the configuration information of target cells 5 and 6, then target cell 4 can further negotiate resources with target cells 5 and 6 and
  • the target cell 4 is sent to the UE in advance, so that when the UE moves and switches to cells 5 and 6, it only needs to send simplified uplink signaling (simplified UL signaling) when there is no data or signaling to be uploaded immediately after the switching. signaling), and there is no need to frequently acquire the configuration information of the target cell.
  • the UE in the connected state is taken as an example to describe the solution for cell handover controlled by the UE autonomously, however, the present application is not limited to this. In some other embodiments of the present application, the above-described solution for cell handover controlled by the UE autonomously is also applicable to the UE in the idle state and the UE in the inactive state.
  • FIG. 12A shows a schematic diagram of a method for cell handover according to a fourth exemplary implementation of the present application.
  • the method 1200 shown in FIG. 12A may include steps S1204-S1228.
  • the serving cell 100A determines the target cells 112-1, 112-2, . . . , 112-N of the UE 20A in the connected state.
  • N is a positive integer.
  • the target cells 112-1, 112-2, . . . , 112-N are cells that the UE 20A may handover to, and the number of which may be one or more.
  • the serving cell 100A can predict the target cells 112-1, 112-2, .
  • step S1208 the serving cell 100A sends a handover preparation (HO preparation) message to the target cells 112-1, 112-2, ..., 112-N, respectively.
  • the handover preparation message requests the target cell to reserve resources for the UE 20A.
  • the target cells 112-1, 112-2, ..., 112-N respectively send a handover preparation response (HO preparation response) including configuration information to the serving cell 100A.
  • the configuration information sent by the target cells 112-1, 112-2, . . . , 112-N may be the same or different.
  • the configuration information may include resources reserved for the UE 20A, and valid time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the reserved resources may include, for example, but not limited to, at least one of the following: C-RNTI, SR, RACH resources (eg, public or dedicated preamble, etc.), SRB or DRB configuration, grant or CG or GF configuration , key, compression algorithm configuration, PHY and/or MAC and/or RLC and/or PDCP and/or SDAP configuration, etc.
  • the effective time information may be, for example, the effective start time of the reserved resources, or, the time period during which the reserved resources are effective, and the time period is defined by the effective start time and the effective end time, or, the reserved resources are effective.
  • the effective end time of the resource (in this case, for example, but not limited to, the effective start time of the default resource is from the successful resource reservation or the handover command (HO CMD) or the conditional handover command (CHO CMD) issued to the UE. start successfully).
  • the configuration information may include one or more sets of resources reserved for the UE 20A, and each set of resources may correspond to the same or different effective time information.
  • the uplink synchronization information may be, for example, TA, or a mapping relationship between different values of measurement parameters and TA.
  • the measurement parameters may include, for example, but not limited to, one or more of the following: time information, signal quality of downlink signals of the serving cell and/or one or more of its neighbor cells, the geographic location of the UE, and the distance between the UE and the cell distance etc.
  • the time information may refer to, for example, the time, minutes, seconds, and the like.
  • the signal quality of the downlink signal may be, for example, but not limited to, an RSRP value, an RSRQ value, an SINR value, a CQI value, and/or a CSI value, and the like.
  • the signal quality of the downlink signal may be, for example, but not limited to, a single cell, a single beam, and/or multiple cells and/or beams.
  • the signal quality of the downlink signal may be obtained, for example, but not limited to, based on one or more of the following measurements: SSB, CSI-RS, DMRS, and the like.
  • the request message sent by the serving cell 100A to the target cells 112-1, 112-2, . 112-N can set the effective time information of the resource reserved for the UE 20A with reference to the effective time information of the proposed resource.
  • the request message sent by the serving cell 100A to the target cells 112-1, 112-2, . . . , 112-N further includes suggested uplink synchronization information and/or suggested auxiliary information for determining uplink synchronization information, then
  • the target cells 112-1, 112-2, . . . , 112-N may refer to the proposed uplink synchronization information and/or auxiliary information to set uplink synchronization information associated with the target cells.
  • the auxiliary information for determining the uplink synchronization information may include, but is not limited to, one or more of the following: the position, speed, moving direction and/or altitude information of the UE 20A; the information of the serving cell 100A and/or its neighboring cells Downlink RSRP; and, UE 20A to TA of serving cell 100A, etc.
  • the serving cell 100A delivers the configuration information received from the target cells 112-1, 112-2, . . . , 112-N to the UE 20A by means of the base station of the serving cell 100A.
  • the serving cell 100A may issue the configuration information to the UE 20A in advance through a handover command (HO CMD) or a conditional handover command (CHO CMD) before the UE 20A performs cell handover.
  • HO CMD handover command
  • CHO CMD conditional handover command
  • the serving cell 100A can also deliver the identification information of the target cells 112-1, 112-2, . -2, ..., 112-N frequency points, cell list and/or beam list, etc.
  • the UE 20A acquires the target cell to be handed over.
  • the serving cell 100A determines the target cell to be handed over by the UE 20A and issues the identification of the determined target cell to the UE 20A, so that the UE 20A obtains the target cell to be handed over.
  • the UE 20A switches the configuration according to the conditions previously issued by the serving cell 100A, and measures the signal quality of the serving cell 100A and its neighboring cells, or only measures the signal quality of the neighboring cells of the serving cell 100A; If the signal quality of the cell satisfies the measurement event specified in the conditional handover configuration, the UE 20A determines the certain neighboring cell as the target cell to be handed over.
  • the serving cell 100A determines the target cell to be handed over by the UE 20A during the regular handover procedure and that the UE 20A determines the target cell to be handed over during the CHO procedure, such as but not limited to in 3GPP TS38.300 V16.3.0 section 9.2.
  • the cell handover process recorded in 3.2 and the CHO process recorded in 3GPP TS38.300 V16.3.0 have already been described, so they will not be repeated here.
  • the target cell to be handed over by the UE 20A is hereinafter referred to as the target cell 112-i.
  • step S1224 after camping on and handing over to the target cell 112-i, the UE 20A sends uplink information to the base station of the target cell 112-i to inform the UE 20A that it has been handed over to the target cell 112-i.
  • the uplink information may be the uplink data and/or signaling to be uploaded by the UE 20A immediately.
  • the uplink information is a conventional uplink signaling used to notify the UE 20A that it has switched to the target cell 112-i
  • the conventional uplink signaling may include, but is not limited to, RRC connection reconfiguration complete (RRC Connection Reconfiguration Complete) signaling, for example.
  • the UE 20A faces the following situations when sending uplink information to the target cell 112-i.
  • the target cell 112-i is one of the target cells 112-1, 112-2, . . . , 112-N, and the serving cell 100A delivers the target cell 112-i to the UE 20A in advance
  • the corresponding configuration information includes the resources reserved for the UE 20 and the effective time information corresponding to the reserved resources, but does not include the uplink synchronization information associated with the target cell 112-i.
  • the UE 20A first determines whether the reserved resource is currently effective based on the effective time information corresponding to the reserved resource. If valid, UE 20A sends uplink information to target cell 112-i through a non-contention-based random access procedure (eg, the non-contention-based random access procedure shown in FIG. 10C or FIG. 10D ) using the reserved resources . If not valid, UE 20A sends uplink information to target cell 112-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • the target cell 112-i is one of the target cells 112-1, 112-2, . . . , 112-N, and the serving cell 100A delivers the target cell 112-i to the UE 20A in advance
  • the corresponding configuration information includes the resources reserved for the UE 20A and the uplink synchronization information associated with the target cell 112-i, but does not include the effective time information corresponding to the reserved resources (in this case, it is reserved for the UE 20A by default. resources are always in effect).
  • UE 20A sends uplink information to target cell 112-i based on the uplink synchronization information using the reserved resources.
  • the UE 20A uses the reserved resources to send uplink information to the target cell 112-i according to the TA.
  • the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA
  • UE 20A first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved The resource of 112-i sends uplink information to the target cell 112-i according to the retrieved TA.
  • the target cell 112-i is one of the target cells 112-1, 112-2, . . . , 112-N, and the serving cell 100A delivers the target cell 112-i to the UE 20A in advance
  • the corresponding configuration information includes resources reserved for the UE 20A, effective time information corresponding to the reserved resources, and uplink synchronization information associated with the target cell 112-i.
  • the UE 20A first determines whether the reserved resource is currently effective based on the effective time information corresponding to the reserved resource. If not valid, UE 20A sends uplink information to target cell 112-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • UE 20A sends uplink information to target cell 112-i based on the uplink synchronization information using the reserved resources.
  • the uplink synchronization information is a TA
  • the UE 20A uses the reserved resources to send uplink information to the target cell 112-i according to the TA.
  • the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA
  • UE 20A first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved
  • the resource of 112-i sends uplink information to the target cell 112-i according to the retrieved TA.
  • the target cell 110-i is not the target cell 112-1, 112-2, . . . , 112-N.
  • UE 20A sends uplink information to target cell 112-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • step S1228 after receiving the uplink information sent by the UE 20A, the target cell 112-i registers the UE 20A as a UE that has been handed over to the target cell 112-i.
  • Fig. 12B shows a schematic diagram of a method for cell handover according to the fifth exemplary implementation of the present application, and the method 1240 shown in Fig. 12B may include steps S1244-S1268.
  • the serving cell 100B determines the target cells 114-1, 114-2, . . . , 114-N of the UE 20B in the connected state.
  • N is a positive integer.
  • the target cells 114-1, 114-2, . . . , 114-N are cells that the UE 20B may switch to, and the number of which may be one or more.
  • the serving cell 100B can predict the target cells 114-1, 114-2, . . . , 114-N through the movement trajectory of the UE 20B.
  • step S1248 the serving cell 100B sends a handover preparation (HO preparation) message to the target cells 114-1, 114-2, ..., 114-N, respectively.
  • the handover preparation message requests the target cell to reserve resources for the UE 20B.
  • the target cells 114-1, 114-2, ..., 114-N respectively send a handover preparation response (HO preparation response) including configuration information to the serving cell 100B.
  • the configuration information sent by the target cells 114-1, 114-2, . . . , 114-N may be the same or different.
  • the configuration information may only include resources reserved for UE 20B.
  • the reserved resources may include, for example, but not limited to, at least one of the following: C-RNTI, SR, RACH resources (eg, public or dedicated preamble, etc.), SRB or DRB configuration, grant or CG or GF configuration , key, compression algorithm configuration, PHY and/or MAC and/or RLC and/or PDCP and/or SDAP configuration, etc.
  • the configuration information may include resources reserved for the UE 20B, as well as valid time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the effective time information may be, for example, the effective start time of the reserved resources, or, the time period during which the reserved resources are effective, and the time period is defined by the effective start time and the effective end time, or, the reserved resources are effective.
  • the effective end time of the resource (in this case, for example, but not limited to, the effective start time of the default resource is from the successful resource reservation or the handover command (HO CMD) or the conditional handover command (CHO CMD) issued to the UE. start successfully).
  • the configuration information may include one or more sets of resources reserved for the UE 20B, and each set of resources may correspond to the same or different effective time information.
  • the uplink synchronization information may be, for example, TA, or a mapping relationship between different values of measurement parameters and TA.
  • the measurement parameters may include, for example, but not limited to, one or more of the following: time information, signal quality of downlink signals of the serving cell and/or one or more of its neighbor cells, the geographic location of the UE, and the distance between the UE and the cell distance etc.
  • the time information may refer to, for example, the time, minutes, seconds, and the like.
  • the signal quality of the downlink signal may be, for example, but not limited to, an RSRP value, an RSRQ value, an SINR value, a CQI value, and/or a CSI value, and the like.
  • the signal quality of the downlink signal may be, for example, but not limited to, a single cell, a single beam, and/or multiple cells and/or beams.
  • the signal quality of the downlink signal may be obtained, for example, but not limited to, based on one or more of the following measurements: SSB, CSI-RS, DMRS, and the like.
  • the request message sent by the serving cell 100B to the target cells 114-1, 114-2, . 114-N can set the effective time information of the resource reserved for the UE 20B with reference to the effective time information of the proposed resource.
  • the request message sent by the serving cell 100B to the target cells 114-1, 114-2, ..., 114-N further includes the proposed uplink synchronization information and/or the proposed auxiliary information for determining the uplink synchronization information, then
  • the target cells 114-1, 114-2, . . . , 114-N may refer to the proposed uplink synchronization information and/or auxiliary information to set uplink synchronization information associated with the target cells.
  • the auxiliary information for determining the uplink synchronization information may include, but is not limited to, one or more of the following: the position, speed, moving direction and/or altitude information of the UE 20B; the information of the serving cell 100B and/or its neighboring cells Downlink RSRP; and, TA from UE 20B to serving cell 100B, etc.
  • the serving cell 100B sends the configuration information received from the target cells 11B-1, 11B-2, . . . , 11B-N to the UE 20B by means of the base station of the serving cell 100B.
  • the serving cell 100B may issue the configuration information to the UE 20B in advance through a handover command (HO CMD) or a conditional handover command (CHO CMD) before the UE 20B performs cell handover.
  • HO CMD handover command
  • CHO CMD conditional handover command
  • the serving cell 100B may also deliver the identification information of the target cells 114-1, 114-2, . -2, ..., 114-N frequency points, cell list and/or beam list, etc.
  • the UE 20B acquires the target cell to be handed over.
  • the serving cell 100B determines the target cell to be handed over by the UE 20B and issues the identification of the determined target cell to the UE 20B, so that the UE 20B obtains the target cell to be handed over.
  • the UE 20B measures the signal quality of the serving cell 100B and its adjacent cells according to the CHO configuration previously issued by the serving cell 100B, or only measures the signal quality of the adjacent cells of the serving cell 100B; if a certain adjacent cell If the signal quality meets the measurement event specified in the CHO configuration, the UE 20B determines the certain neighboring cell as the target cell to be handed over.
  • the serving cell 100B determines the target cell to be handed over by the UE 20B in the regular handover procedure and the UE 20B determines the target cell to be handed over in the CHO procedure, such as but not limited to in 3GPP TS38.300 V16.3.0 section 9.2.
  • the cell handover process recorded in 3.2 and the CHO process recorded in 3GPP TS38.300 V16.3.0 have been described, and will not be repeated here.
  • the target cell to be handed over by the UE 20B is hereinafter referred to as the target cell 114-i.
  • step S1264 after camping on and handing over to the target cell 114-i, the UE 20B sends uplink information to the base station of the target cell 114-i to inform the UE 20B that it has been handed over to the target cell 114-i.
  • the uplink information may be the uplink data and/or signaling to be uploaded by the UE 20B immediately.
  • the uplink information is a simplified uplink signaling (Simplified UL Signaling).
  • the simplified uplink signaling may be, for example, but not limited to one of the following: a dedicated preamble, a dedicated SRS, a dedicated SR, UCI sent by CG or GF, MAC CE sent by CG or GF, RRC message sent by CG or GF , a common random access channel message containing the UE identity (eg, C-RNTI), a common SRS containing the UE identity, a common SR containing the UE identity, and a resource message (Grant) containing the UE identity.
  • a dedicated preamble e.g, a dedicated SRS, a dedicated SR, UCI sent by CG or GF, MAC CE sent by CG or GF, RRC message sent by CG or GF , a common random access channel message containing the UE identity (eg, C-RNTI), a common SRS containing the UE identity, a common SR containing the UE identity, and a resource message (Grant) containing the UE identity
  • the UE 20B faces the following situations when sending uplink information to the target cell 114-i.
  • the target cell 114-i is one of the target cells 114-1, 114-2, . . . , 114-N, and the serving cell 100B delivers the target cell 114-i to the UE 20B in advance
  • the corresponding configuration information only includes the resources reserved for the UE 20B, but does not include the effective time information corresponding to the reserved resources and the uplink synchronization information associated with the target cell 114-i.
  • the UE 20B uses the reserved resources to communicate to the target cell 114-i through a non-contention-based random access procedure (eg, the non-contention-based random access procedure shown in FIG. 10C or FIG. 10D ). Send upstream information.
  • the target cell 114-i is one of the target cells 114-1, 114-2, . . . , 114-N, and the serving cell 100B delivers the target cell 114-i to the UE 20B in advance
  • the corresponding configuration information includes the resources reserved for the UE 20B and the effective time information corresponding to the reserved resources, but does not include the uplink synchronization information associated with the target cell 114-i.
  • UE 20B first determines whether the reserved resource is currently effective based on the effective time information corresponding to the reserved resource. If effective, UE 20B sends uplink information to target cell 114-i through a non-contention-based random access procedure (eg, the non-contention-based random access procedure shown in FIG.
  • UE 20B sends uplink information to target cell 114-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • a contention-based random access procedure eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B .
  • the target cell 114-i is one of the target cells 114-1, 114-2, . . . , 114-N, and the serving cell 100B delivers the target cell 114-i to the UE 20B in advance
  • the corresponding configuration information includes the resources reserved for the UE 20B and the uplink synchronization information associated with the target cell 114-i, but does not include the effective time information corresponding to the reserved resources (in this case, it is reserved for the UE 20B by default. resources are always in effect).
  • the UE 20B uses the reserved resources to send uplink information to the target cell 114-i based on the uplink synchronization information.
  • the UE 20B uses the reserved resources to send uplink information to the target cell 114-i according to the TA.
  • the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA
  • UE 20B first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved The resource of 114-i sends uplink information to the target cell 114-i according to the retrieved TA.
  • the target cell 114-i is one of the target cells 114-1, 114-2, . . . , 114-N, and the serving cell 100 delivers the target cell 114-i to the UE 20B in advance
  • the corresponding configuration information includes resources reserved for the UE 20B, effective time information corresponding to the reserved resources, and uplink synchronization information associated with the target cell 114-i.
  • the UE 20B first determines whether the reserved resource is currently effective based on the effective time information corresponding to the reserved resource. If not valid, UE 20B sends uplink information to target cell 114-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • UE 20B sends uplink information to target cell 114-i based on the uplink synchronization information using the reserved resources.
  • the uplink synchronization information is a TA
  • the UE 20B uses the reserved resources to send uplink information to the target cell 114-i according to the TA.
  • the uplink synchronization information is the mapping relationship between different values of the measurement parameters and the TA
  • the UE 20B first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved
  • the resource of 114-i sends uplink information to the target cell 114-i according to the retrieved TA.
  • the target cell 114-i is not the target cell 114-1, 114-2, . . . , 114-N.
  • UE 20B sends uplink information to target cell 114-i through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • step S1268 after receiving the uplink information sent by the UE 20B, the target cell 114-i registers the UE 20B as a UE that has been handed over to the target cell 114-i.
  • the following describes a schematic diagram of a communication method in a non-handover scenario provided by the sixth exemplary implementation of the present application with reference to FIG. 12C .
  • the communication method 1280 shown in FIG. 12C may include steps S1284-S1288.
  • the serving cell 130 determines and delivers configuration information to the UE 40 residing in the serving cell 130.
  • the UE 40 may be an idle state, an inactive state, or a connected state UE.
  • the serving cell 130 may, for example, but not limited to, deliver the configuration to the UE 40 or the UE group to which the UE 40 belongs via the SIB in the system information carried by the broadcast channel.
  • the serving cell 130 sends the information to the UE 40 via RRC or non-access stratum (Non-Access Stratum: NAS) signaling.
  • RRC Non-Access Stratum
  • the serving cell 130 may, for example, but not limited to, deliver the configuration information to the UE 40 via the SIB in the system information carried by the broadcast channel or via RRC signaling.
  • the configuration information may only include the resources reserved by the serving cell 130 for the UE 40 or the UE group to which the UE 40 belongs.
  • the configuration information may include, for example, the resources reserved by the serving cell 130 for the UE 40 or the UE group to which the UE 40 belongs, and the effective time information corresponding to the reserved resources and/or the uplink synchronization associated with the serving cell 130 information.
  • the reserved resources may, for example, include but are not limited to at least one of the following: C-RNTI, SR, RACH resources (for example, public or dedicated preamble, etc.), SRB or DRB configuration, resource (grant) or CG or GF configuration etc.
  • the effective time information may be, for example, the effective start time of the reserved resources, or the time period defined by the effective start time and the effective end time of the reserved resources, or, the effective time of the reserved resources. End time (for example, but not limited to, the default effective start time starts from the successful resource reservation or the successful delivery of configuration information to the UE 40).
  • the configuration information may include one or more sets of resources reserved for the UE 40, and each set of resources may correspond to the same or different effective time information.
  • the uplink synchronization information may be, for example, TA, or a mapping relationship between different values of measurement parameters and TA.
  • the measurement parameters may include, for example, but not limited to, one or more of the following: time information, signal quality of downlink signals of the serving cell and/or one or more of its neighbor cells, the geographic location of the UE, and the distance between the UE and the cell distance etc.
  • the time information may refer to, for example, the time, minutes, seconds, and the like.
  • the signal quality of the downlink signal may be, for example, but not limited to, an RSRP value, an RSRQ value, an SINR value, a CQI value, and/or a CSI value, and the like.
  • the signal quality of the downlink signal may be, for example, but not limited to, a single cell, a single beam, and/or multiple cells and/or beams.
  • the signal quality of the downlink signal may be obtained, for example, but not limited to, based on one or more of the following measurements: SSB, CSI-RS, DMRS, and the like.
  • step S1288 after receiving the configuration information sent by the serving cell 130, when the UE 40 wants to send uplink data and/or signaling to the serving cell 130, the UE 40 sends the configuration information to the serving cell 130 based on the received configuration information. Uplink data and/or signaling.
  • the UE 40 faces the following situations when sending the uplink data and/or signaling to the serving cell 130 based on the received configuration information.
  • the configuration information delivered by the serving cell 130 to the UE 40 only includes the resources reserved for the UE 40 or the UE group to which the UE 40 belongs, but does not include the effective time information corresponding to the reserved resources and the service
  • the uplink synchronization information associated with the cell 130, the UE 40 uses the reserved resources to pass the non-contention-based random access process (for example, the non-contention-based random access process shown in FIG. 10C or FIG. 10D ) to the serving cell. 130 Send uplink data and/or signaling.
  • the configuration information delivered by the serving cell 130 to the UE 40 includes the resources reserved for the UE 40 or the UE group to which the UE 40 belongs and the effective time information corresponding to the reserved resources, but does not include the information related to the serving cell. 130 associated uplink synchronization information, the UE 40 first determines whether the reserved resource is currently valid based on the valid time information corresponding to the reserved resource. If valid, the UE 40 uses the reserved resources to send uplink data and/or to the serving cell 130 through a non-contention-based random access procedure (eg, the non-contention-based random access procedure shown in FIG. 10C or FIG. 10D ). or signaling. If not valid, UE 40 sends uplink data and/or signaling to serving cell 130 through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ).
  • a non-contention-based random access procedure eg, the non-contention-based random access procedure shown in FIG. 10C or FIG. 10
  • the configuration information delivered by the serving cell 130 to the UE 40 includes the resources reserved for the UE 40 or the UE group to which the UE 40 belongs and the uplink synchronization information associated with the serving cell 130, but does not include the reserved resources.
  • the effective time information corresponding to the resource in this case, the resources reserved for the UE 40 are always effective, then the UE 40 uses the reserved resources to send uplink data and/or signaling to the serving cell 130 based on the uplink synchronization information .
  • the UE 40 uses the reserved resource to send uplink data and/or signaling to the serving cell 130 according to the TA.
  • the UE40 If the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA, the UE40 first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved The resource sends uplink data and/or signaling to the serving cell 130 according to the retrieved TA.
  • the configuration information delivered by the serving cell 130 to the UE 40 includes the resources reserved for the UE 40 or the UE group to which the UE 40 belongs, the effective time information corresponding to the reserved resources, and the information associated with the serving cell 130.
  • Upstream synchronization information The UE 40 first determines whether the reserved resource is currently valid based on the valid time information corresponding to the reserved resource. If not valid, UE 40 sends uplink data and/or signaling to serving cell 130 through a contention-based random access procedure (eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B ). If valid, UE 40 sends uplink data and/or signaling to serving cell 130 based on the uplink synchronization information using the reserved resources.
  • a contention-based random access procedure eg, the contention-based random access procedure shown in FIG. 10A or FIG. 10B
  • the UE 40 uses the reserved resource to send uplink data and/or signaling to the serving cell 130 according to the TA. If the uplink synchronization information is a mapping relationship between different values of measurement parameters and TA, the UE40 first obtains the actual value of the measurement parameter, then retrieves the TA corresponding to the actual value from the mapping relationship, and finally uses the reserved The resource sends uplink data and/or signaling to the serving cell 130 according to the retrieved TA.
  • the serving cell delivers configuration information to the UE residing in it in advance. Therefore, when the UE sends uplink data and/or signaling to the serving cell, if the serving cell gives the UE a If the reserved resources are valid and the configuration information includes uplink synchronization information associated with the serving cell, the UE can directly use the reserved resources without going through the random access procedure to send uplink data to the serving cell according to the uplink synchronization information associated with the serving cell. and/or signaling, thereby speeding up the transmission of uplink data and signaling.
  • FIG. 13 shows a schematic diagram of a communication device according to an embodiment of the present application.
  • the communication device 1300 shown in FIG. 13 may be, for example, but not limited to, a chip or the like.
  • Communication device 1300 may include communication interface 1310 and logic circuit 1320 .
  • the communication interface 1310 of the communication device 1300 receives at least one configuration information from the serving cell, the at least one configuration information being provided by at least one target cell.
  • the logic circuit 1320 of the communication apparatus 1300 may, for example, select a first target cell to be handed over as shown in the method 500 of FIG. 5A , wherein the first target cell is one of the at least one target cell, and, Handover to the first target cell and so on according to the selection.
  • the logic circuit 1320 of the communication device 1300 may, for example, determine the target cell as shown in the method 530 of FIG. 5D .
  • the communication interface 1310 of the communication device 1300 may perform the following operations, for example: sending a request message to the target cell, the request message requesting the target cell to reserve resources for the UE; receiving configuration information from the target cell, the configuration The information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell; and sending the configuration information to the UE.
  • the communication interface 1310 of the communication device 1300 may, for example, receive a request message from the serving cell, the request message requesting the target cell to reserve resources for the UE, and send a configuration to the serving cell information, the configuration information includes reserved resources, and effective time information corresponding to the reserved resources and/or uplink synchronization information associated with the target cell.
  • the logic circuit 1320 of the communication apparatus 1300 may, for example, as shown in the method 560 of FIG. 5E , register the UE as the UE handed over to the target cell when receiving the uplink information of the UE.
  • FIG. 14 shows a schematic diagram of a communication device according to an embodiment of the present application.
  • the communication device 1400 shown in FIG. 14 may include a processor 1410 and a memory 1420 connected to the processor 1410 .
  • the memory 1420 stores program instructions that, when executed by the processor 1410, cause the processor 1410 to perform the method 500 shown in FIG. 5A, or the method 530 shown in FIG. 5D, or the method 560 shown in FIG. 5E.
  • the processor 1410 can be, but is not limited to, a general-purpose processor, a digital signal processor (Digital Signal Processor: DSP), an application specific integrated circuit (Application Specific Integrated Circuit: ASIC), a Field Programmable Gate Array (Field Programmable Gate Array: FPGA) or Other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • a general-purpose processor may be either a microprocessor or the processor, any conventional processor, or the like.
  • the memory 1420 can be, for example, but not limited to, a portable computer disk, a hard disk, a read-only memory (Read-Only Memory: ROM), a random access memory (Random Access Memory: RAM), an erasable programmable read-only memory (Electrically Erasable Programmable read only memory: EPROM), optical fiber, portable compact disk read only memory (Compact Disc Read-Only Memory: CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above.
  • the processor and memory can be discrete or integrated.
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.
  • Embodiments of the present application further provide a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, causes the processor to execute a method for cell handover, and the method includes the methods described in the foregoing embodiments. at least one of the options.
  • the processor may be, but is not limited to, a general purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
  • a general-purpose processor may be either a microprocessor or the processor, any conventional processor, or the like.
  • the computer storage medium of the embodiments of the present application may adopt any combination of one or more computer-readable media.
  • the computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium.
  • the computer readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the above. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, RAM, ROM, EPROM, optical fibers, CD-ROMs, optical storage devices , a magnetic memory device, or any suitable combination of the above.
  • a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.
  • a computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave, with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing.
  • a computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device .
  • the program code embodied on the computer-readable medium may be transmitted by any suitable medium, including, but not limited to, wireless, wire, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the above.
  • suitable medium including, but not limited to, wireless, wire, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the above.
  • Computer program code for carrying out the operations of the present application may be written in one or more programming languages, including, for example, but not limited to, object-oriented programming languages—such as Java, Smalltalk, C++, or a combination thereof. , but also conventional procedural programming languages - such as "C" or similar programming languages.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server.
  • the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or Wide Area Network (WAN), or it may be connected to an external computer (eg use an internet service provider to connect via the internet).
  • LAN Local Area Network
  • WAN Wide Area Network
  • an external computer eg use an internet service provider to connect via the internet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本申请涉及用于小区切换的方法和装置，该方法包括：终端从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的；所述终端选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一；所述终端根据所述选择切换到所述第一目标小区；所述终端根据所述第一目标小区对应的配置信息进行通信。利用该方法和装置，能够实现终端节能。

Description

用于小区切换的方法和装置 技术领域
本申请涉及通信技术领域，尤其涉及用于小区切换的方法和装置、通信系统、芯片系统、计算机可读存储介质和计算机程序。
背景技术
第五代(简称5G)无线接入技术英文全文是New Radio，简称NR。
在NR的系统中，终端(User Equipment：UE)具有三个状态：空闲(Idle)态、非激活(Inactive)态和连接(Connected)态。
连接态的UE当从一个小区移动到另一小区时要进行小区切换。图1示出了现有技术的连接态的UE的小区切换的示意图。如图1所示，连接态的UE从小区1移动到小区2、从小区2移动到小区3和从小区3移动到小区4时都会发生小区切换，每次小区切换包括四个步骤：测量配置下发G1、测量上报G2、切换命令(Handover Command:HO CMD)或条件切换命令(Conditional Handover Command:CHO CMD)下发G3和随机接入G4。在测量配置下发G1步骤，UE的服务小区提前向UE下发测量配置。在测量上报G2步骤，在下发的测量配置中指定的测量事件满足后，UE将测量报告上报给服务小区。在切换命令或条件切换命令下发G3步骤，服务小区参考UE上报的测量报告(可选地，也可以不参考该测量报告)，选择UE要切换的目标小区并通知该目标小区准备切换相关的资源(例如，目标小区的频点和物理层小区标识(Physical-layer Cell Identity:PCI)、专用前导码(Preamble)、数据无线承载(Data Radio Bearer:DRB)配置、免资源(Grant Free:GF)配置等)，然后通过切换命令将目标小区的切换相关的资源下发给UE。在随机接入G4步骤，在收到服务小区下发的切换命令或条件切换命令之后，UE发起目标小区的接入(例如，通过专用前导码或公用前导码接入到目标小区)，并发送切换完成(HO complete)消息给目标小区。至此，从空口来看，连接态的UE的一个完整切换流程就完成了。
由上述可见，在现有技术中，连接态的UE的小区切换由网络控制。发明人在做出本申请时发现，由网络控制的小区切换使用很多切换相关控制信令(例如，测量配置下发、测量报告上报和切换命令下发)，而UE对这些控制信令的收发会消耗UE的电能，特别是如果高速移动的UE一直处于连接态，则UE会频繁进行小区切换，这会导致UE电能消耗很快。
发明内容
考虑到现有技术的以上缺陷，本申请的实施例提供用于小区切换的方法和装置，利用该方法和装置能够实现终端节能。
第一方面，提供一种用于小区切换的方法，所述方法包括：终端从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的；所述 终端选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一；所述终端根据所述选择切换到所述第一目标小区；以及，所述终端根据所述第一目标小区对应的配置信息进行通信。终端选择要切换的目标小区并且根据该选择切换到所选择的目标小区，即终端在无需网络控制的情况下自主选择要切换的小区并切换到所选择的小区，在此过程中不需终端上传测量报告和小区下发切换命令，减少了切换相关信令开销，相应地减少了终端电能消耗，因此能够实现终端节能。
根据第一方面，在所述方法的第一种可能实现方式中，所述终端选择要切换的第一目标小区包括：所述终端接收所述服务小区下发的小区重选参数；以及，所述终端基于所接收的小区重选参数执行小区重选过程以选取所述第一目标小区作为要切换的小区。终端采用小区重选过程来选择要切换的小区，可以快速选择要切换的小区。
根据第一方面，在所述方法的第二种可能实现方式中，所述终端选择要切换的第一目标小区包括：所述终端测量至少所述服务小区的相邻小区的信号质量；所述终端确定至少第一相邻小区的信号质量使得指定的测量事件被满足且所述第一相邻小区是所述至少一个目标小区的其中之一；以及，所述终端选取所述第一相邻小区作为所述第一目标小区。终端基于测量事件来选择要切换的小区，可以准确地选择能够切换的小区。
根据第一方面，或以上第一方面的任一可能实现方式，在所述方法的第三种可能实现方式中，所述终端根据所述第一目标小区对应的配置信息进行通信包括：所述终端发送上行数据或信令。终端通过发送上行数据或信令来告知其已切换到所选择的目标小区，可以使得所选择的目标小区能够快速获知终端当前在哪个小区下，并及时对终端进行下行控制信息发送和数据调度，因此，在节省终端的切换信令开销的情况下仍然能够满足下行数据的快速调度和发送。
根据第一方面或以上第一方面的任一可能实现方式，在所述方法的第四种可能实现方式中，所述配置信息包括与所述至少一个目标小区关联的上行同步信息。在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。
根据第一方面或以上第一方面的任一可能实现方式，在所述方法的第五种可能实现方式中，所述配置信息包括：预留的资源以及所述资源对应的生效时间信息。通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
根据第一方面或以上第一方面的任一可能实现方式，在所述方法的第六种可能实现方式中，所述上行同步信息包括时间提前量。通过上行同步信息包括使用时间提前量，能够有利地避免终端上传的数据和/或信令对小区的信号接收进行干扰。
根据第一方面或以上第一方面的任一可能实现方式，在所述方法的第七种可能实现方式中，所述上行同步信息包括测量参数的不同取值与时间提前量的映射关系，其中，所述终端上传数据或信令包括：所述终端获取所述测量参数的实际值；所述终端根据所述测量参数的实际值和与所述第一目标小区关联的所述映射关系，确定 所述第一目标小区的时间提前量；以及，所述终端按照所确定的时间提前量发送所述上行数据或信令。通过上行同步信息包括测量参数的不同取值与时间提前量的映射关系，终端能够使用与终端的实际情形相对较匹配的时间提前量来发送上行数据和/或信令，从而能够更有利地避免终端上传的数据和/或信令对小区的信号接收进行干扰。
根据第一方面或以上第一方面的任一可能实现方式，在所述方法的第八种可能实现方式中，所述测量参数包括以下至少一种：时间信息、所述第一目标小区和/或其一个或多个相邻小区的下行信号的信号质量、所述终端的地理位置和所述终端与所述第一目标小区的间隔距离。通过以上测量参数，可以容易地确定与UE的实际情形相对较匹配的时间提前量。
根据第一方面或以上第一方面的任一可能实现方式，在所述方法的第九种可能实现方式中，所述方法还包括：在发送所述上行数据或信令的同时或之后，所述终端向所述第一目标小区发送以下至少之一：所述服务小区的标识和所述终端在所述服务小区中的标识；所述至少一个目标小区的信息；以及，用于请求所述终端的更多目标小区的配置信息的消息。通过向所述第一目标小区发送所述服务小区的标识和所述终端在所述服务小区中的标识，所述第一目标小区能够从所述服务小区获取与所述终端相关的数据(例如，所述服务小区已接收但还未成功发送给所述终端的下行数据、所述服务小区已成功从所述终端接收但还未成功转发给核心网网元的上行数据和/或所述终端的上下文信息等)，从而把积压在所述服务小区中的所述终端的下行数据发送给所述终端，保证不发生丢包现象。通过向所述第一目标小区发送所述至少一个目标小区的信息，所述第一目标小区能够判断所述终端是否需要更多目标小区的配置信息，并在需要时向所述终端提前下发更多目标小区的配置信息，从而避免所述终端在移动过程频繁索要目标小区的配置信息。通过向所述第一目标小区发送用于请求所述终端的更多目标小区的配置信息的消息,所述第一目标小区能够在所述终端切换到其它小区之前给所述终端提前下发更多目标小区的配置信息。
根据第一方面，或以上第一方面的任一种可能实现方式，在所述方法的第十种可能实现方式中，当所述至少一个目标小区为多个时，所述至少一个目标小区包括至少两个串行切换的目标小区。在所述至少一个目标小区包括至少两个串行切换的目标小区的情况下，终端已提前具有随后接续串行切换的目标小区的配置信息，并且终端在每次完成新目标小区接入后，原先收到的串行切换的目标小区的配置信息不丢弃，直到该配置信息对应的生效时间过期后才丢弃该配置信息，因此，能够避免终端频繁索要目标小区的配置信息。
根据第一方面，或以上第一方面的任一种可能实现方式，在所述方法的第十一种可能实现方式中，所述方法还包括：在切换到所述第一目标小区之前或之后，所述终端向所述服务小区发送通知信息，所述通知信息指示所述终端已切换到另一小区。例如但不局限于，对于硬切换情形，在UE使用所述第一目标小区分配的资源与所述第一目标小区进行通信之前(例如但不局限于，在收到切换命令(Handover Command:HO CMD)或条件切换命令(Conditional Handover Command:CHO CMD)之后且在离开所述服务小区之前)，所述UE向所述服务小区发送通知信息以指示所述UE已切换到另一小区。例如但不局限于，对于软切换情形，在所述UE切换到所 述第一目标小区之前或之后，在所述UE从所述第一目标小区接收到指示与原服务小区断开的消息的情况下，所述UE向所述服务小区发送通知信息以指示所述UE已切换到另一小区。通过在切换到另一小区之前或之后终端向原服务小区发送通知信息以告知终端已切换到其它小区，原服务小区能够及时断开与原服务小区的连接以停止对终端的下行调度和释放已分配给终端的资源给其它终端使用，这能提高资源利用率。
第二方面，提供一种用于小区切换的方法，所述包括：确定目标小区；向所述目标小区发送请求消息，所述请求消息请求所述目标小区给终端预留资源；从所述目标小区接收配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息；以及，向所述终端发送所述配置信息。给终端提前下发潜在目标小区给终端预留的资源，因此终端在驻留和切换到这些潜在目标小区之后，可以直接使用提前下发的资源进行上行数据或信令传输，从而能够加快上行数据或信令的传输。此外，给终端提前下发与潜在目标小区关联的上行同步信息，从而，当终端切换的小区是该潜在目标小区时，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，给终端提前下发给终端预留的资源对应的生效时间信息，因此，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，这能提高资源利用率。
根据第二方面，在所述方法的第一种可能实现方式中，所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息。通过向目标小区发送的请求消息中包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，能够有助于目标小区有效地确定给终端预留的资源对应的生效时间信息和与目标小区关联的上行同步信息。
根据第二方面或第二方面的第一种可能实现方式，在所述方法的第二种可能实现方式中，所述上行同步信息包括时间提前量，或者，测量参数的不同取值与时间提前量之间的映射关系。通过上行同步信息包括使用时间提前量，能够有利地避免UE上传的数据和/或信令对小区的信号接收进行干扰。通过上行同步信息包括测量参数的不同取值与时间提前量的映射关系，终端能够使用与终端的实际情形相对较匹配的时间提前量来发送上行数据和/或信令，从而能够更有利地避免终端上传的数据和/或信令对小区的信号接收进行干扰。
根据第二方面或以上第二方面的任一可能实现方式，在所述方法的第三种可能实现方式中，所述测量参数包括时间信息、小区的下行信号的信号质量、终端的地理位置或者终端与小区的间隔距离。通过以上测量参数，可以容易地确定与终端的实际情形相对较匹配的时间提前量。
第三方面，提供一种用于小区切换的方法，所述方法包括：从服务小区接收请求消息，所述请求消息请求目标小区给终端预留资源；以及，向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。目标小区给终端预留的资源被服务小区下发给终端，因此终端在驻留和切换到该目标小区之后，可以直接使用该资源进行上 行数据或信令传输，从而能够加快上行数据或信令的传输。此外，与目标小区关联的上行同步信息被服务小区下发给终端，从而，当终端切换的小区是该目标小区时，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，给终端预留的资源对应的生效时间信息被服务小区下发给终端，因此，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，这能提高资源利用率。
根据第三方面，在所述方法的第一种可能实现方式中，所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息是基于所建议的资源的生效时间信息，和/或，所建议的上行同步信息和/或用于决定上行同步信息的辅助信息而设置的。通过使用服务小区建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，能够有助于目标小区有效地确定给终端预留的资源对应的生效时间信息和与目标小区关联的上行同步信息。
根据第三方面或第三方面的第一种可能实现方式，在所述方法的第二种可能实现方式中，所述方法还包括：接收所述终端的上行信息；以及，将所述终端登记为切换到所述目标小区的终端。当第一次接收终端的上行信息时将终端登记为切换到目标小区的终端，能够使目标小区获知终端当前已切换到其下，以便及时对终端进行下行控制信息发送和数据调度。
第四方面，提供一种用于小区切换的装置，所述装置包括接收单元、选择单元、切换单元和通信单元。所述接收单元用于从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的。所述选择单元用于选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一。所述切换单元用于根据所述选择切换到所述第一目标小区。所述通信单元用于根据所述第一目标小区对应的配置信息进行通信。终端选择要切换的目标小区并且根据该选择切换到所选择的目标小区，即终端在无需网络控制的情况下自主选择要切换的小区并切换到所选择的小区，在此过程中不需终端上传测量报告和小区下发切换命令，减少了切换相关信令开销，相应地减少了终端电能消耗，因此能够实现终端节能。
根据第四方面，在所述装置的第一种可能实现方式中，所述接收单元还用于接收所述服务小区下发的小区重选参数，以及，所述选择单元进一步用于基于所接收的小区重选参数执行小区重选过程以选取所述第一目标小区作为要切换的小区。终端采用小区重选过程来选择要切换的小区，可以快速选择要切换的小区。
根据第四方面，在所述装置的第二种可能实现方式中，所述装置还包括用于测量至少所述服务小区的相邻小区的信号质量的测量单元，其中，所述选择单元进一步用于确定至少第一相邻小区的信号质量使得指定的测量事件被满足且所述第一相邻小区是所述至少一个目标小区的其中之一，以及，选取所述第一相邻小区作为所述第一目标小区。终端基于测量事件来选择要切换的小区，可以准确地选择能够切换的小区。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第三种 可能实现方式中，所述通信单元进一步用于发送上行数据或信令。终端通过发送上行数据或信令来告知其已切换到所选择的目标小区，可以使得所选择的目标小区能够快速获知终端当前在哪个小区下，并及时对终端进行下行控制信息发送和数据调度，因此，在节省终端的切换信令开销的情况下仍然能够满足下行数据的快速调度和发送。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第四种可能实现方式中，所述配置信息包括与所述至少一个目标小区关联的上行同步信息。在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第五种可能实现方式中，所述配置信息包括：预留的资源以及所述资源对应的生效时间信息。通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第六种可能实现方式中，所述上行同步信息包括时间提前量。通过上行同步信息包括使用时间提前量，能够有利地避免终端上传的数据和/或信令对小区的信号接收进行干扰。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第七种可能实现方式中，所述上行同步信息包括测量参数的不同取值与时间提前量的映射关系，其中，所述装置还包括用于获取所述测量参数的实际值的获取单元和用于根据所述测量参数的实际值和与所述第一目标小区关联的所述映射关系来确定所述第一目标小区的时间提前量的确定单元，其中，所述通信单元进一步用于按照所确定的时间提前量发送所述上行数据或信令。通过上行同步信息包括测量参数的不同取值与时间提前量的映射关系，终端能够使用与终端的实际情形相对较匹配的时间提前量来发送上行数据和/或信令，从而能够更有利地避免终端上传的数据和/或信令对小区的信号接收进行干扰。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第八种可能实现方式中，所述测量参数包括以下至少一种：时间信息、所述第一目标小区和/或其一个或多个相邻小区的下行信号的信号质量、终端的地理位置和终端与所述第一目标小区的间隔距离。通过以上测量参数，可以容易地确定与UE的实际情形相对较匹配的时间提前量。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第九种可能实现方式中，所述通信单元还用于在发送所述上行数据或信令的同时或之后，向所述第一目标小区发送以下至少之一：所述服务小区的标识和所述终端在所述服务小区中的标识；所述至少一个目标小区的信息；以及，用于请求所述终端的更多目标小区的配置信息的消息。通过向所述第一目标小区发送所述服务小区的标识和所述终端在所述服务小区中的标识，所述第一目标小区能够从所述服务小区获取与所述终端相关的数据(例如，所述服务小区已接收但还未成功发送给所述终端的下行数据、所述服务小区已成功从所述终端接收但还未成功转发给核心网网元的上行数据和/或所述终端的上下文信息等)，从而把积压在所述服务小区中的所述终端的下行数据发送给 所述终端，保证不发生丢包现象。通过向所述第一目标小区发送所述至少一个目标小区的信息，所述第一目标小区能够判断所述终端是否需要更多目标小区的配置信息，并在需要时向所述终端提前下发更多目标小区的配置信息，从而避免所述终端在移动过程频繁索要目标小区的配置信息。通过向所述第一目标小区发送用于请求所述终端的更多目标小区的配置信息的消息,所述第一目标小区能够在所述终端切换到其它小区之前给所述终端提前下发更多目标小区的配置信息。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第十种可能实现方式中，当所述至少一个目标小区为多个时，所述至少一个目标小区包括至少两个串行切换的目标小区。在所述至少一个目标小区包括至少两个串行切换的目标小区的情况下，终端已提前具有随后接续切换的目标小区的配置信息，并且终端在每次完成新目标小区接入后，原先收到的串行切换的目标小区的配置信息不丢弃，直到该配置信息对应的生效时间过期后才丢弃该配置信息，因此，能够避免终端频繁索要目标小区的配置信息。
根据第四方面或以上第四方面的任一可能实现方式，在所述装置的第十一种可能实现方式中，所述装置还包括发送单元，所述发送单元用于在切换到所述第一目标小区之后，向所述服务小区发送通知信息，所述通知信息指示所述终端已切换到另一小区。通过在切换到另一小区之后终端向原服务小区发送通知信息以告知终端已切换到其它小区，原服务小区能够及时释放已分配给终端的资源以提供给其它终端使用，这能提高资源利用率。
第五方面，提供一种用于小区切换的装置，所述装置包括确定单元、第一发送单元、接收单元和第二发送单元。确定单元用于确定目标小区。第一发送单元用于向所述目标小区发送请求消息，所述请求消息请求所述目标小区给终端预留资源。接收单元用于从所述目标小区接收配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。第二发送单元用于向所述终端发送所述配置信息。给终端提前下发潜在目标小区给终端预留的资源，因此终端在驻留和切换到这些潜在目标小区之后，可以直接使用提前下发的资源进行上行数据或信令传输，从而能够加快上行数据或信令的传输。此外，给终端提前下发与潜在目标小区关联的上行同步信息，从而，当终端切换的小区是该潜在目标小区时，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，给终端提前下发给终端预留的资源对应的生效时间信息，因此，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，这能提高资源利用率。
根据第五方面，在所述装置的第一种可能实现方式中，所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息。通过向目标小区发送的请求消息中包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，能够有助于目标小区有效地确定给终端预留的资源对应的生效时间信息和与目标小区关联的上行同步信息。
根据第五方面或第五方面的第一种可能实现方式，在所述装置的第二种可 能实现方式中，所述上行同步信息包括时间提前量，或者，测量参数的不同取值与时间提前量之间的映射关系。通过上行同步信息包括使用时间提前量，能够有利地避免UE上传的数据和/或信令对小区的信号接收进行干扰。通过上行同步信息包括测量参数的不同取值与时间提前量的映射关系，终端能够使用与终端的实际情形相对较匹配的时间提前量来发送上行数据和/或信令，从而能够更有利地避免终端上传的数据和/或信令对小区的信号接收进行干扰。
根据第五方面的第二种可能实现方式，在所述装置的第三种可能实现方式中，所述测量参数包括时间信息、小区的下行信号的信号质量、终端的地理位置或者终端与小区的间隔距离。通过以上测量参数，可以容易地确定与终端的实际情形相对较匹配的时间提前量。
第六方面，提供一种用于小区切换的装置，所述装置包括接收单元和发送单元。接收单元用于从服务小区接收请求消息，所述请求消息请求目标小区给终端预留资源。发送单元用于向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。目标小区给终端预留的资源被服务小区下发给终端，因此终端在驻留和切换到该目标小区之后，可以直接使用该资源进行上行数据或信令传输，从而能够加快上行数据或信令的传输。此外，与目标小区关联的上行同步信息被服务小区下发给终端，从而，当终端切换的小区是该目标小区时，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，给终端预留的资源对应的生效时间信息被服务小区下发给终端，因此，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，这能提高资源利用率。
根据第六方面，在所述装置的第一种可能实现方式中，所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息是基于所建议的资源的生效时间信息，和/或，所建议的上行同步信息和/或用于决定上行同步信息的辅助信息而设置的。通过使用服务小区建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，能够有助于目标小区有效地确定给终端预留的资源对应的生效时间信息和与目标小区关联的上行同步信息。
根据第六方面或第六方面的第一种可能实现方式，在所述装置的第二种可能实现方式中，所述接收单元还用于接收所述终端的上行信息，其中，所述装置还包括用于将所述终端登记为切换到所述目标小区的终端的登记单元。当第一次接收终端的上行信息时将终端登记为切换到目标小区的终端，能够使目标小区获知终端当前已切换到其下，以便及时对终端进行下行控制信息发送和数据调度。
第七方面，提供一种通信系统，所述通信系统包括第五方面或以上第五方面的任一可能实现方式中的装置和第六方面或以上第六方面的任一可能实现方式中的装置。
第八方面，提供一种通信装置，所述通信装置包括通信接口和逻辑电路， 其中逻辑电路执行第一方面或以上第一方面的任一可能实现方式中的方法，第二方面或以上第二方面的任一可能实现方式中的方法，或者，第三方面或以上第三方面的任一可能实现方式中的方法。
第八方面，提供一种计算机可读存储介质，其上存储有程序指令，所述程序指令当被计算机执行时使得所述计算机执行第一方面或以上第一方面的任一可能实现方式中的方法，第二方面或以上第二方面的任一可能实现方式中的方法，或者，第三方面或以上第三方面的任一可能实现方式中的方法。
第九方面，提供一种计算机程序，其包括有程序指令，所述程序指令当被计算机执行时使得所述计算机执行第一方面或以上第一方面的任一可能实现方式中的方法，第二方面或以上第二方面的任一可能实现方式中的方法，或者，第三方面或以上第三方面的任一可能实现方式中的方法。
第十方面，提供一种用于小区切换的方法，所述方法包括：终端从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的，所述至少一个配置信息包括给所述终端预留的资源，以及，所述资源对应的生效时间信息和/或与所述至少一个目标小区关联的上行同步信息；所述终端获取要切换的第一目标小区，所述第一目标小区是在所述服务小区的控制下确定的；所述终端切换到所述第一目标小区；以及，所述终端基于所述配置信息向所述第一目标小区发送上行信息，以通知所述终端已切换到所述第一目标小区。这里，通过在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
第十一方面，提供一种用于小区切换的方法，所述方法包括：终端从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的，所述至少一个配置信息包括给终端预留的资源；所述终端获取要切换的第一目标小区，所述第一目标小区是在所述服务小区的控制下确定的；所述终端切换到所述第一目标小区；以及，所述终端基于所述配置信息向所述第一目标小区发送简化上行信令，以通知所述终端已切换到所述第一目标小区。这里，通过简化上行信令，小区能够快速获知终端当前在哪个小区下，并及时对终端进行下行控制信息发送和数据调度，因此，在节省终端的切换信令开销的情况下仍然能够满足下行数据的快速调度/发送。
第十二方面，提供一种用于小区切换的装置，所述装置包括：接收单元，用于从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的，所述至少一个配置信息包括给终端预留的资源，以及，所述资源对应的生效时间信息和/或与所述至少一个目标小区关联的上行同步信息；获取单元，用于获取要切换的第一目标小区，所述第一目标小区是在所述服务小区的控制下确定的；切换单元，用于将所述终端切换到所述第一目标小区；以及，发送单元，用于基于所述配置信息向所述第一目标小区发送上行信息，以通知所述终端已切换到所述第一目标小区。这里，通过在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞 争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
第十三方面，提供一种用于小区切换的装置，所述装置包括：接收单元，用于从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的，所述至少一个配置信息包括给终端预留的资源；获取单元，用于获取要切换的第一目标小区，所述第一目标小区是在所述服务小区的控制下确定的；切换单元，用于将所述终端切换到所述第一目标小区；以及，发送单元，用于基于所述配置信息向所述第一目标小区发送简化上行信令，以通知所述终端已切换到所述第一目标小区。这里，通过简化上行信令，小区能够快速获知终端当前在哪个小区下，并及时对终端进行下行控制信息发送和数据调度，因此，在节省终端的切换信令开销的情况下仍然能够满足下行数据的快速调度/发送。
第十四方面，提供一种通信方法，所述通信方法包括：终端从服务小区接收配置信息，所述配置信息包括所述服务小区给所述终端预留的资源，以及，所述资源对应的生效时间信息和/或与所述服务小区关联的上行同步信息；以及，所述终端基于所接收的配置信息向所述服务小区发送上行数据和/或信令。这里，通过在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
第十五方面，提供一种通信装置，所述通信装置包括接收单元和发送单元，其中，所述接收单元用于从服务小区接收配置信息，所述配置信息包括所述服务小区给所述终端预留的资源，以及，所述资源对应的生效时间信息和/或与所述服务小区关联的上行同步信息，以及，所述发送单元用于基于所接收的配置信息向所述服务小区发送上行数据和/或信令。这里，通过在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
第十六方面，提供一种通信方法，所述通信方法包括：确定终端对应的配置信息，所述配置信息包括所述服务小区给所述终端预留的资源，以及，所述资源对应的生效时间信息和/或与所述服务小区关联的上行同步信息；以及，向所述终端发送所述配置信息。这里，通过在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
第十七方面，提供一种通信装置，所述通信装置包括确定单元和发送单元，其中，所述确定单元用于确定终端对应的配置信息，所述配置信息包括所述服务小区给所述终端预留的资源，以及，所述资源对应的生效时间信息和/或与所述服务小区关联的上行同步信息，以及，所述发送单元用于向所述终端发送所述配置信息。这里，通过在配置信息中包括与小区关联的上行同步信息，终端可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，通过在配置信息中包括给终端预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被终端使用，则可以释放该资源以将其提供给其它终端使用，从而提高资源利用率。
第十八方面，提供一种通信设备，所述通信设备包括处理器和与所述处理器连接的存储器，其中，所述存储器存储有程序指令，所述程序指令当被所述处理器执行时使得所述处理器执行第一方面或以上第一方面的任一可能实现方式中的方法，第二方面或以上第二方面的任一可能实现方式中的方法，或者，第三方面或以上第三方面的任一可能实现方式中的方法。
附图说明
以下参照附图来进一步说明本申请的各个特征和各个特征之间的联系。附图均为示例性的，一些特征并不以实际比例示出，并且一些附图中可能省略了本申请所涉及领域的惯常的且对于本申请非必要的特征，或是额外示出了对于本申请非必要的特征，附图所示的各个特征的组合并不用以限制本申请。具体的附图说明如下：
图1示出了现有技术的连接态的UE的小区切换的示意图；
图2示出了按照本申请的实施例的信号传输场景的示意图；
图3示出了基站和UE的用户面和控制面协议栈的示意图；
图4示出了按照本申请的实施例的系统架构的示意图；
图5A示出了按照本申请的第一实施例的用于小区切换的方法的示意图；
图5B示出了按照本申请的实施例的选择要切换的目标小区的步骤的示意图；
图5C示出了按照本申请的实施例的选择要切换的目标小区的步骤的示意图；
图5D示出了按照本申请的第二实施例的用于小区切换的方法的示意图；
图5E示出了按照本申请的第三实施例的用于小区切换的方法的示意图；
图6A示出了按照本申请的第一实施例的用于小区切换的装置的示意图；
图6B示出了按照本申请的第二实施例的用于小区切换的装置的示意图；
图6C示出了按照本申请的第三实施例的用于小区切换的装置的示意图；
图7示出了按照本申请的实施例的通信系统的示意图；
图8示出了按照本申请的第一示例性实现的用于小区切换的方法的示意图；
图9A示出了按照本申请的第二示例性实现的上行数据传输的方法的示意图；
图9B示出了按照本申请的实施例的基于简化上行信令的简化切换流程的示意图；
图9C示出了按照本申请的实施例的示例性的映射关系的示意图；
图10A示出了基于竞争的4步随机接入过程的示意图；
图10B示出了基于竞争的2步随机接入过程的示意图；
图10C示出了基于非竞争的4步随机接入过程的示意图；
图10D示出了基于非竞争的2步随机接入过程的示意图；
图11A示出了按照本申请的第三示例性实现的下行数据传输的方法的示意图；
图11B示出了按照本申请的实施例的配置信息下发的示意图；
图12A示出了按照本申请的第四示例性实现的用于小区切换的方法的示意图；
图12B示出了按照本申请的第五示例性实现的用于小区切换的方法的示意图；
图12C示出了按照本申请的第六示例性实现的非切换场景情况下的通信方法的示意图；
图13示出了按照本申请的实施例的通信装置的示意图；以及
图14示出了按照本申请的实施例的通信设备的示意图。
具体实施方式
说明书和权利要求书中的词语第一、第二、第三或模块A、模块B、模块C等类似用语，仅用于区别类似的对象，不代表针对对象的特定排序，可以理解地，在允许的情况下可以互换特定的顺序或先后次序，以使这里描述的本申请实施例能够以除了在这里图示或描述的以外的顺序实施。
在以下的描述中，所涉及的表示步骤的标号，如S110、S120……等，并不表示一定会按此步骤执行，在允许的情况下可以互换前后步骤的顺序，或同时执行。
说明书和权利要求书中使用的术语“包括”不应解释为限制于其后列出的内容；它不排除其它的元件或步骤。因此，其应当诠释为指定所提到的所述特征、整体、步骤或部件的存在，但并不排除存在或添加一个或更多其它特征、整体、步骤或部件及其组群。因此，表述“包括装置A和B的设备”不应局限为仅由部件A和B组成的设备。此外，说明书和权利要求书中使用的术语“多个”表示两个或两个以上。
本说明书中提到的“一些实施例”或“实施例”意味着与该实施例结合描述的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，在本说明书各处出现的用语“在一些实施例中”或“在实施例中”并不一定都指相同实施例，但可以指相同实施例。此外，在一个或多个实施例中，能够以任何适当的方式组合各特定特征、结构或特性，如从本公开对本领域的普通技术人员显而易见的那样。
为了准确地对本申请中的技术内容进行叙述，以及为了准确地理解本申请中的技术内容，在对具体实施方式进行说明之前先对本说明书中所使用的术语给出如下的解释说明或定义。
PLMN(Public Land Mobile Network，公共陆地移动网络)：指运营商或网管系统。它是由政府或它所批准的经营者(比如，移动运营商、联通运营商或电信运营商等)为公众提供陆地移动通信业务目的而建立和经营的网络。
LTE(Long Term Evolution：长期演进)：指3GPP(The 3rd Generation Partnership Project：第三代合作伙伴计划)组织制定的UMTS(Universal Mobile Telecommunications System：通用移动通信系统)技术标准的长期演进。
NR：指第五代(简称5G)无线接入技术，也叫做New Radio，其英文全 称是New Radio Access Technology in 3GPP，也可简称为5G-NR。
eNB(Evolved Node B：演进型Node B)：指LTE的基站。
gNB：指NR的基站。
eMBB(Enhance Mobile Broadband：增强移动宽带业务)：指在现有移动宽带业务场景的基础上，对于用户体验等性能的进一步提升，这也是最贴近我们日常生活的应用场景。5G在这方面带来的最直观的感受就是网速的大幅提升，即便是观看4K高清视频，峰值能够达到10Gbps。比如eMBB指3D/超高清视频等大流量移动宽带业务。
URLLC(Ultra Reliable and Low Latency Communication：超可靠低时延通信)：其特点是高可靠、低时延、极高的可用性。它包括以下各类场景及应用：工业应用和控制、交通安全和控制、远程制造、远程培训、远程手术等。URLLC在无人驾驶业务方面拥有很大潜力。此外，URLLC对于安防行业也十分重要。例如，URLLC可以指无人驾驶、工业自动化等需要低时延、高可靠连接的业务。
MTC：指机器型通信，其英文全称为Machine-Type Communication，也可简称为M2M。MTC具有低成本和覆盖增强的特点。
mMTC(Massive Machine Type Communication：大规模机器通信)：指大规模物联网业务，主要场景包括车联网、智能物流、智能资产管理等。
IoT：指物联网，其英文全称为Internet of Things。IoT是互联网基础上的延伸和扩展的网络，其将各种信息传感设备与互联网结合起来而形成的一个巨大网络，实现在任何时间和任何地点等，人、机、物的互联互通。IoT包括窄带物联网。
NB-IoT：指窄带物联网，其英文全称为Narrow Band Internet of Thing。NB-IoT具有覆盖广、连接多、速率低、成本低、功耗低、架构优等特点，比如海量连接、更低功耗和更低芯片成本。NB-IoT可以应用于例如智能水表、智能停车、宠物智能跟踪、智能自行车、智能烟雾检测器、智能马桶、智能售货机、可穿戴设备等。
D2D:指设备到设备，其英文全称为Device-to-Device。D2D通信是一种在系统的控制下，允许终端之间通过复用小区资源直接进行通信的新型技术。
CPE(Customer Premise Equipment：客户前置设备)：指接收移动信号并以无线WIFI信号转发出来的移动信号接入设备。CPE也可以是将高速4G信号或者5G信号转换成WIFI信号的设备，可支持同时上网的移动UE数量也较多。CPE可以大量应用于农村、城镇、医院、单位、工厂、小区等无线网络接入，能节省铺设有线网络的费用。
AR：指增强现实，其英文全称为Augmented Reality。
VR：指虚拟现实，其英文全称为Virtual Reality。
V2X：指车联网，其英文全称为vehicle to everything。V2X是未来智能交通运输系统的关键技术。它使得车与车、车与基站、基站与基站之间能够通信，获得实时路况、道路信息、行人信息等一系列交通信息，从而提高驾驶安全性、减少拥堵、提高交通效率、提供车载娱乐信息等。
本申请以信号传输场景为背景。图2示出了按照本申请的实施例的信号传 输场景的示意图。如图2所示，信号传输场景包括基站10和UE 20，其中，基站10位于小区中并且可以向UE20发送信号，UE20也可以向基站10发送信号。
基站10是网络中的无线基站，也是无线接入网的网元，其可以是例如LTE基站eNB、5G基站gNB、卫星、未来通信系统的基站或其它通信系统的基站等。
基站10可以是宏基站或者小基站，其中，小基站例如可以是微基站(Micro gNB/NodeB)、微微基站(Pico gNB/NodeB)或毫微微基站(Femto gNB/NodeB)等。
基站10还可以是TRP(transmission and receiver point：收发结点)，其可以接收UE发送的信号，和/或向UE发送信号。
基站10负责空中接口相关的所有功能。具体地，基站10负责无线链路维护功能，以保持与UE20间的无线链路，同时负责无线链路数据和IP(Internet Protocol：互联网协议)数据质监的协议转换。此外，基站10还负责无线资源管理功能，包括无线链路的建立和释放、无线资源的调度和分配等。此外，基站10还负责部分移动性管理功能，包括配置UE进行测量、评估UE无线链路质量、决策UE在小区间的切换等。
UE 20也可以称为用户设备或移动台等，其可以是车载型的、便携型的或手持型的等。UE 20的物理设备与移动用户可以是完全独立的，与用户有关的全部信息可以都储存在智能卡(Subscriber Identity Module：SIM)中，该智能卡可以在UE20上使用。UE20可以完成与基站10直接的空口接口的交互。UE20可以发送信号和/或接收信号。
基站10和UE20分别可以包括物理层(physical layer：PHY)、媒体接入管理层(Medium Access Control：MAC)、无线链路管理层(Radio link control：RLC)、分组数据汇聚协议层(Packet Data Convergence Protocol：PDCP)、业务数据适配协议层(Service Data Adaptation Protocol：SDAP)和无线资源控制层(Radio Resource Control：RRC)。基站10和UE20分别可以包括用户面(user plane)协议和控制面(control plane)协议。图3示出了基站和UE的用户面和控制面协议栈的示意图。从图3可以看出，PHY、MAC、RLC和PDCP位于基站和UE的用户面和控制面，SDAP仅位于基站和UE的用户面，而RRC位于基站和UE的控制面。
除了适用于基站和UE之间的常规通信场景之外，本申请也适用于UE与UE之间的通信场景、基站和基站之间的通信场景、UE与卫星之间的通信场景或者车联网、物联网、工业互联网等的通信场景等。其中，在UE与UE之间的通信场景中，至少一个UE充当常规基站的角色。在基站和基站之间的通信场景中，至少一个基站充当常规UE的角色，例如公交车上的无线网关设备等。在UE与卫星之间的通信场景中，卫星充当常规基站的角色。因此，在本申请中，除了特别说明之外，基站可以包括常规基站或在通信中充当常规基站的其它任何合适的设备，以及，UE可以包括常规UE或在通信中充当常规UE的其它任何合适的设备。
本申请对于同构网络与异构网络的场景均适用，同时对于传输点也无限制，可以是宏基站与宏基站、微基站与微基站和宏基站与微基站之间的多点协同传输。本申请对FDD(Frequency Division Duplexing：频分双工)和TDD(Time Division Duplexing：时分双工)系统均适用。本申请也适用于低频场景、高频场景、太赫兹场 景和光通信场景等。本申请可以适用于5G通信系统、卫星通信系统、未来演进的通信系统或者其他通信系统等，本申请对此不做限定。
图4示出了按照本申请的实施例的系统架构的示意图。图4所示的系统架构包括基站10、UE 20和核心网30，其中，基站10和UE20通过空口相互通信，基站10和核心网30相互通信。基站10和UE20已经在上面结合图2和图3详细描述，在此不再赘述。
移动通信网络通常划分为三个部分：基站子系统、网络子系统和系统支撑部分(例如，安全管理等)。核心网30位于网络子系统内，其主要作用是把空口上来的呼叫请求或数据请求，接续到不同的网络上。核心网30作为移动通信网络的核心部分，起着承上启下的作用，主要负责处理UE的移动管理、会话管理以及数据传输。具体地，核心网30主要提供用户连接、用户管理和承载连接(Access to)，作为承载网络提供到外部网络的接口。用户连接包括移动性管理(Mobility Management：MM)、呼叫管理(Calling Management：CM)、交换/路由、录音通知(结合智能网业务完成到智能网外围设备的连接关系)等功能。用户管理包括用户的描述、业务质量(quality of service：Qos)描述(包括对用户业务Qos的描述)、用户通信记录(Accounting)、虚拟家庭环境(Virtual Home Environment：VHE)(与智能网平台的对话提供虚拟居家环境)、安全性(由鉴权中心提供相应的安全性措施包含了对移动业务的安全性管理和对外部网络访问的安全性处理)。承载连接包括到外部的公共交互电话网(Public Switched Telephone Network：PSTN)、外部电路数据网和分组数据网、因特网(Internet)、企业内部网(Intranet)、以及短信息服务(Short Message Service：SMS)服务器的连接等。核心网可以提供的基本业务包括移动办公、电子商务、通信、娱乐性业务、旅行和基于位置的服务、遥感业务(Telemetry)、简单消息传递业务(监视控制)等。
核心网30可以是5G核心网。5G核心网在演进型分组核心网(Evolved Packet Core Network：EPC)的基础上有三个新的增强方面：以服务为基础的架构、支持网络切片、控制面和用户面分离。5G核心网30相比于4G核心网再次向分离式的架构演进。该分离式的架构包括网络功能的分离，以及，控制面和用户面的分离。网络功能的分离吸收了网络功能虚拟化(Network Function Virtualization：NFV)云原生的设计思想，以软件化、模块化、服务化的方式来构建网络。控制面和用户面的分离让用户面功能摆脱“中心化”的约束，使其既可灵活部署于核心网，也可部署于接入网。
图5A示出了按照本申请的第一实施例的用于小区切换的方法的示意图。图5A所示的方法500包括步骤S504-S516。
在步骤S504，UE从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的。其中，所述UE可以是连接态的、空闲态的或非激活态的。所述至少一个目标小区可以是所述UE有可能切换到的小区。所述配置信息至少包括所述至少一个目标小区给所述UE预留的资源，所述资源例如可以包括但不 局限于以下至少之一：小区无线网络临时标识(Cell-Radio Network Temporary Identity：C-RNTI)、调度请求(Scheduling Request：SR)、随机接入信道(Random Access Channel：RACH)资源(例如，公共前导码(preamble)或专用前导码)、信令无线承载(Signal Radio Bearer：SRB)或数据无线承载(Data Radio Bearer：DRB)配置、资源(grant)或配置资源(Configured Grant：CG)或免资源(Grant Free：GF)配置、秘钥、压缩算法配置、物理层(Physical Layer:PHY)和/或媒体访问控制层(Media Access Control：MAC)和/或无线链路控制层(Radio Link Control：RLC)和/或分组数据汇聚协议层(Packet Data Convergence Protocol：PDCP)和/或业务数据适配协议层(Service Data Adaptation Protocol：SDAP)配置等。
在步骤S508，所述UE选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一。例如但不局限于，所述UE可以采用图8的步骤S820所提到的方案一、方案二和方案三之一来选择要切换的目标小区。
在步骤S512，所述UE根据所述选择切换到所述第一目标小区。
在步骤S516，所述UE根据所述第一目标小区对应的配置信息进行通信。通过步骤S516，所述第一目标小区将被告知所述UE已切换到其下。
UE选择要切换的目标小区并且根据该选择切换到所选择的目标小区，即UE在无需网络控制的情况下自主选择要切换的小区并切换到所选择的小区，在此过程中不需UE上传测量报告和小区下发切换命令，减少了切换相关信令开销，相应地减少了UE电能消耗，因此能够实现UE节能。
在一些实施例中，如图5B所示，步骤S508可以包括步骤S5080和S5082。
在步骤S5080，所述UE接收所述服务小区下发的小区重选参数。
在步骤S5082，所述UE基于所接收的小区重选参数执行小区重选过程以选取所述第一目标小区作为要切换的小区。例如，所述UE可以采用图8的步骤S820所提到的方案一来选取要切换的小区。
UE采用小区重选过程来选择要切换的小区，可以快速选择要切换的小区。
在一些实施例中，如图5C所示，步骤S508可以包括步骤S5084和S5086。
在步骤S5084，所述UE测量所述服务小区的至少一个相邻小区的信号质量。
在步骤S5086，所述UE从所述至少一个相邻小区中选取第一相邻小区作为所述第一目标小区，其中所述第一相邻小区的信号质量满足指定的测量事件且所述第一相邻小区是所述至少一个目标小区的其中之一。
UE基于测量事件来选择要切换的小区，可以准确地选择能够切换的小区。
在一些实施例中，步骤S516进一步包括：所述UE发送上行数据或信令。这里，所述上行数据或信令可以是在切换之后所述UE立即要上传的数据或信令，或者，所述上行数据或信令可以是用于通知所述UE已切换到所述第一目标小区的简化上行信令(Simplified UL Signaling)。UE通过发送上行数据或信令来告知其已切换到所选择的目标小区，可以使得所选择的目标小区能够快速获知UE当前在哪个小区下，并及时对UE进行下行控制信息发送和数据调度，因此，在节省UE的切换信令开销的情况下仍然能够满足下行数据的快速调度/发送。
在一些实施例中，所述配置信息包括与所述至少一个目标小区关联的上行同步信息。在配置信息中包括与小区关联的上行同步信息，UE可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。
在一些实施例中，所述配置信息包括预留的资源以及所述资源对应的生效时间信息。所述生效时间信息可以是资源的生效起始时间，或用于指示资源的生效起始时间和生效结束时间的时间段，或资源的生效结束时间(在这种情况下，例如但不局限于，默认资源的生效起始时间从资源预留成功或给UE下发切换命令(Handover Command:HO CMD)或条件切换命令(Conditional Handover Command:CHO CMD)成功开始)。通过在配置信息中包括给UE预留的资源的生效时间信息，在该资源的生效时间过去之后，如果该资源仍没有被UE使用，则可以释放该资源以将其提供给其它UE使用，从而提高资源利用率。
在一些实施例中，所述上行同步信息包括时间提前量。这里，通过上行同步信息包括使用时间提前量，能够有利地避免UE上传的数据和/或信令对小区的信号接收进行干扰。
在一些实施例中，所述上行同步信息包括测量参数的不同取值与时间提前量的映射关系，其中，所述UE上传数据或信令包括：所述UE获取所述测量参数的实际值；以及，所述UE根据所述测量参数的实际值和与所述第一目标小区关联的所述映射关系，确定所述第一目标小区的时间提前量；以及，所述UE按照所确定的时间提前量发送所述上行数据或信令。这里，通过上行同步信息包括测量参数的不同取值与时间提前量的映射关系，UE能够使用与UE的实际情形相对较匹配的时间提前量来发送上行数据和/或信令，从而能够更有利地避免UE上传的数据和/或信令对小区的信号接收进行干扰。
在一些实施例中，所述测量参数包括以下至少一种：时间信息、所述第一目标小区和/或其一个或多个相邻小区的下行信号的信号质量、所述UE的地理位置和所述UE与所述第一目标小区的间隔距离。换言之，例如但不局限于，所述测量参数可以是单个小区的或多个小区的，例如仅服务小区的、仅单个相邻小区的、多个相邻小区的、服务小区和多个邻区的等，也可以是UE粒度的测量参数(如UE位置)。通过以上测量参数，可以容易地确定与UE的实际情形相对较匹配的时间提前量。
在一些实施例中，所述方法还可以包括步骤S520。在步骤S520，在发送所述上行数据或信令的同时或之后，所述UE向所述第一目标小区发送以下至少之一：所述服务小区的标识和所述UE在所述服务小区中的标识；所述至少一个目标小区的信息；以及，用于请求所述UE的更多目标小区的配置信息的消息。所述至少一个目标小区的信息例如可以是但不局限于所述UE从所述服务小区接收的所述至少一个目标小区提供的所述至少一个配置信息。通过向所述第一目标小区发送所述服务小区的标识和所述UE在所述服务小区中的标识，所述第一目标小区能够从所述服务小区获取与所述UE相关的数据(例如，所述服务小区已接收但还未成功发送给所述UE的下行数据、所述服务小区已成功从所述UE接收但还未成功转发给核心网网元的上行数据和/或所述UE的上下文信息等)，从而把积压在所述服务小区中的所述UE的下 行数据发送给所述UE，保证不发生丢包现象。通过向所述第一目标小区发送所述至少一个目标小区的信息，所述第一目标小区能够判断所述UE是否需要更多目标小区的配置信息，并在需要时向所述UE提前下发更多目标小区的配置信息，从而避免所述UE在移动过程频繁索要目标小区的配置信息。通过向所述第一目标小区发送用于请求所述UE的更多目标小区的配置信息的消息,所述第一目标小区能够在所述UE切换到其它小区之前给所述UE提前下发更多目标小区的配置信息。
在一些实施例中，当所述至少一个目标小区为多个时，所述至少一个目标小区包括至少两个串行切换的目标小区。这里，串行切换的目标小区是指UE接续切换的小区(例如，假设该至少两个串行切换的目标小区是目标小区B1、B2和B3，那么串行切换是指：UE首先从目标小区B1切换到B2，然后在合适的时候，UE从目标小区B2切换到B3)。在所述至少一个目标小区包括至少两个串行切换的目标小区的情况下，UE已提前具有后续串行切换的目标小区的配置信息，并且UE在每次完成新目标小区接入后，原先收到的串行切换的目标小区的配置信息不丢弃，直到该配置信息对应的生效时间过期后才丢弃该配置信息，因此，能够避免UE频繁索要目标小区的配置信息。
在一些实施例中，所述方法还可以包括步骤S524。在步骤S524，在切换到所述第一目标小区之前或之后，所述UE向所述服务小区发送通知信息，所述通知信息指示所述UE已切换到另一小区。例如但不局限于，对于硬切换情形，在UE使用所述第一目标小区分配的资源与所述第一目标小区进行通信之前(例如但不局限于，在收到切换命令(HO CMD)或条件切换命令(CHO CMD)之后且在离开所述服务小区之前)，所述UE向所述服务小区发送通知信息以指示所述UE已切换到另一小区。例如但不局限于，对于软切换情形，在所述UE切换到所述第一目标小区之前或之后，在所述UE从所述第一目标小区接收到指示与原服务小区断开的消息的情况下，所述UE向所述服务小区发送通知信息以指示所述UE已切换到另一小区。通过在切换到另一小区之前或之后UE向原服务小区发送通知信息以告知UE已切换到其它小区，原服务小区能够及时断开与原服务小区的连接以停止对UE的下行调度和释放已分配给UE的资源给其它UE使用，这能提高资源利用率。
图5D示出了按照本申请的第二实施例的用于小区切换的方法的示意图。图5D所示的方法530例如可以但不局限于由UE的服务小区来执行。方法530可以包括步骤S534-S546。
在步骤S534，服务小区确定目标小区。这里，目标小区是UE可能会切换的小区。例如，可以根据UE的移动轨迹等来确定目标小区。
在步骤S538，所述服务小区向所述目标小区发送请求消息，所述请求消息请求所述目标小区给UE预留资源。所述资源例如可以包括C-RNTI、SR、RACH资源(例如，公共或专用前导码等)、SRB或DRB配置、资源(grant)或CG或GF配置、秘钥、压缩算法配置、PHY和/或MAC和/或RLC和/或PDCP和/或SDAP配置等。
在步骤S542，所述服务小区从所述目标小区接收配置信息，所述配置信 息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。这里，所述生效时间信息可以是资源的生效起始时间、或资源的生效结束时间、或用于指示资源的生效起始时间和生效结束时间的时间段。
在步骤S546，所述服务小区向所述UE发送所述配置信息。
在本实施例的方案中，给UE提前下发潜在目标小区给UE预留的资源，因此UE在驻留和切换到这些潜在目标小区之后，可以直接使用提前下发的资源进行上行数据或信令传输，从而能够加快上行数据或信令的传输。此外，在本实施例的方案中，给UE提前下发与潜在目标小区关联的上行同步信息，从而，当UE切换的小区是该潜在目标小区时，UE可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，在本实施例的方案中，给UE提前下发给UE预留的资源对应的生效时间信息，因此，在该资源的生效时间过去之后，如果该资源仍没有被UE使用，则可以释放该资源以将其提供给其它UE使用，这能提高资源利用率。
在一些实施例中，所述请求消息可以包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息。这里，通过在服务小区向目标小区发送的请求消息中包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，能够有助于目标小区有效地确定给UE预留的资源对应的生效时间信息和与目标小区关联的上行同步信息。
在一些实施例中，所述上行同步信息可以包括时间提前量，或者，测量参数的不同取值与时间提前量之间的映射关系。这里，通过上行同步信息包括使用时间提前量，能够有利地避免UE上传的数据和/或信令对小区的信号接收进行干扰。通过上行同步信息包括测量参数的不同取值与时间提前量的映射关系，UE能够使用与UE的实际情形相对较匹配的时间提前量来发送上行数据和/或信令，从而能够更有利地避免UE上传的数据和/或信令对小区的信号接收进行干扰。
在一些实施例中，所述测量参数包括时间信息、小区的下行信号的信号质量、UE的地理位置或者UE与小区的间隔距离。通过以上测量参数，可以容易地确定与UE的实际情形相对较匹配的时间提前量。
图5E示出了按照本申请的第三实施例的用于小区切换的方法的示意图。图5E所示的方法560例如可以但不局限于由UE可能会切换的目标小区来执行。方法560可以包括步骤S564-S576。
在步骤S564，目标小区从服务小区接收请求消息，所述请求消息请求目标小区给UE预留资源。
在步骤S568，所述目标小区向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。
在本实施例的方案中，目标小区给UE预留的资源被服务小区下发给UE，因此UE在驻留和切换到该目标小区之后，可以直接使用该资源进行上行数据或信令传输，从而能够加快上行数据或信令的传输。此外，在本实施例的方案中，与目标小 区关联的上行同步信息被目标小区提供给服务小区以下发给UE，从而，当UE切换的小区是该目标小区时，UE可以不需使用基于竞争的随机接入过程就能进行上行数据和/或信令的传输，从而能够减少数据和/或信令的上传时延。此外，在本实施例的方案中，给UE预留的资源对应的生效时间信息被目标小区提供给服务小区以下发给UE，因此，在该资源的生效时间过去之后，如果该资源仍没有被UE使用，则可以释放该资源以将其提供给其它UE使用，这能提高资源利用率。
在一些实施例中，所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息是基于所建议的资源的生效时间信息，和/或，所建议的上行同步信息和/或用于决定上行同步信息的辅助信息而设置的。这里，通过使用服务小区建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，能够有助于目标小区有效地确定给UE预留的资源对应的生效时间信息和与目标小区关联的上行同步信息。
在一些实施例中，方法560还可以包括步骤S572-S576。在步骤S572，接收所述UE的上行信息，这里，所述上行信息例如可以是所述UE切换到所述目标小区之后立即要上传的上行数据和/或信令，或者，所述上行信息例如可以是用于通知所述UE已切换到所述目标小区的简化上行信令。在步骤S576，将所述UE登记为切换到所述目标小区的UE。这里，当第一次接收UE的上行信息时将UE登记为切换到目标小区的UE，能够使目标小区获知UE当前已切换到其下，以便及时对UE进行下行控制信息发送和数据调度。
上文结合图5A-5E详细描述了本申请的用于小区切换的方法实施例，下面结合图6A-6C详细描述本申请的用于小区切换的装置实施例。应理解，方法实施例的描述与装置实施例的描述相互对应，因此，在装置实施例中未详细描述的部分可以参见前面方法实施例。
图6A示出了按照本申请的第一实施例的用于小区切换的装置的示意图。图6A所示的装置600例如但不局限于可以由UE 20或其它任何合适的设备来实现。
如图6A所示，装置600可以包括接收单元604、选择单元608、切换单元612和通信单元616。接收单元604用于从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的。选择单元608用于选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一。切换单元612用于根据所述选择切换到所述第一目标小区。通信单元616用于根据所述第一目标小区对应的配置信息进行通信。
在一些实施例中，接收单元604还可以用于接收所述服务小区下发的小区重选参数，以及，选择单元608进一步用于基于所接收的小区重选参数执行小区重选过程以选取所述第一目标小区作为要切换的小区。
在一些实施例中，装置600还可以包括测量单元620，其用于测量至少所述服务小区的相邻小区的信号质量，其中，选择单元608进一步用于确定至少第一相邻小区的信号质量使得指定的测量事件被满足且所述第一相邻小区是所述至少一个 目标小区的其中之一，以及，选取所述第一相邻小区作为所述第一目标小区。
在一些实施例中，通信单元616可以进一步用于发送上行数据或信令。
在一些实施例中，所述配置信息可以包括与所述至少一个目标小区关联的上行同步信息。
在一些实施例中，所述配置信息可以包括：预留的资源以及所述资源对应的生效时间信息。
在一些实施例中，所述上行同步信息可以包括时间提前量。
在一些实施例中，所述上行同步信息可以包括测量参数的不同取值与时间提前量的映射关系，其中，装置600还可以包括用于获取所述测量参数的实际值的获取单元624和用于根据所述测量参数的实际值和与所述第一目标小区关联的所述映射关系来确定所述第一目标小区的时间提前量的确定单元628，其中，通信单元616可以进一步用于按照所确定的时间提前量发送所述上行数据或信令。
在一些实施例中，所述测量参数可以包括以下至少一种：时间信息、所述第一目标小区和/或其一个或多个相邻小区的下行信号的信号质量、UE的地理位置和UE与所述第一目标小区的间隔距离。
在一些实施例中，通信单元616还可以用于在发送所述上行数据或信令的同时或之后，向所述第一目标小区发送以下至少之一：所述服务小区的标识和所述UE在所述服务小区中的标识；所述至少一个目标小区的信息；以及，用于请求所述UE的更多目标小区的配置信息的消息。
在一些实施例中，当所述至少一个目标小区为多个时，所述至少一个目标小区包括至少两个串行切换的目标小区。
在一些实施例中，装置600还可以包括发送单元632，用于在切换到所述第一目标小区之前或之后，向所述服务小区发送通知信息，所述通知信息指示所述UE已切换到另一小区。
图6B示出了按照本申请的第二实施例的用于小区切换的装置的示意图。图6B所示的装置650例如但不局限于可以由UE的服务小区的基站或其它任何合适的设备来实现。
如图6B所示，装置650可以包括确定单元654、第一发送单元658、接收单元662和第二发送单元666。其中，确定单元654用于确定目标小区。第一发送单元658用于向所述目标小区发送请求消息，所述请求消息请求所述目标小区给UE预留资源。接收单元662用于从所述目标小区接收配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。第二发送单元666用于向所述UE发送所述配置信息。
在一些实施例中，所述请求消息可以包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息。
在一些实施例中，所述上行同步信息可以包括时间提前量，或者，测量参数的不同取值与时间提前量之间的映射关系。
在一些实施例中，所述测量参数可以包括时间信息、小区的下行信号的信 号质量、UE的地理位置或者UE与小区的间隔距离。
图6C示出了按照本申请的第三实施例的用于小区切换的装置的示意图。图6C所示的装置680例如但不局限于可以由UE有可能切换到的目标小区的基站或其它任何合适的设备来实现。
如图6C所示，装置680可以包括接收单元684和发送单元688。其中，接收单元684用于从服务小区接收请求消息，所述请求消息请求目标小区给UE预留资源。发送单元688用于向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。
在一些实施例中，所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息是基于所建议的资源的生效时间信息，和/或，所建议的上行同步信息和/或用于决定上行同步信息的辅助信息而设置的。
在一些实施例中，接收单元684还可以用于接收所述UE的上行信息，其中，装置680还包括登记单元692，用于将所述UE登记为切换到所述目标小区的UE。
图7示出了按照本申请的实施例的通信系统的示意图。如图7所示，通信系统700可以包括图6B所示的装置650和图6C所示的装置680。
下面，以连接态的UE进行小区切换为例，详细说明本申请的用于小区切换的方案的示例性具体实现。
图8示出了按照本申请的第一示例性实现的用于小区切换的方法的示意图。如图8所示，用于小区切换的方法800包括步骤S804-S824。
在步骤S804，服务小区100确定连接态的UE 20的目标小区110-1、110-2、…、110-N。N是正整数。目标小区110-1、110-2、…、110-N是UE 20有可能会切换到的小区，其数量可以是一个或多个。例如但不局限于，服务小区100可以通过UE 20的移动轨迹等来预测得到目标小区110-1、110-2、…、110-N。
在步骤S808，服务小区100分别向目标小区110-1、110-2、…、110-N发送切换准备(HO preparation)消息。该切换准备消息请求目标小区给UE 20预留资源。
在步骤S812，目标小区110-1、110-2、…、110-N分别向服务小区100发送包含配置信息的切换准备响应(HO preparation response)。目标小区110-1、110-2、…、110-N各自发送的配置信息可以相同，也可以不同。
该配置信息可以仅包括给UE 20预留的资源。所预留的资源可以包括例如但不局限于以下至少之一：C-RNTI、SR、RACH资源(例如，公共或专用前导码等)、SRB或DRB配置、资源(grant)或CG或GF配置、秘钥、压缩算法配置、PHY和/或MAC和/或RLC和/或PDCP和/或SDAP配置等。
或者，该配置信息可以包括给UE 20预留的资源，以及，所预留的资源对 应的生效时间信息和/或与目标小区关联的上行同步信息。
生效时间信息例如可以是所预留的资源的生效起始时间，或者，所预留的资源生效的时间段，该时间段由生效起始时间和生效结束时间限定，或者，所预留的资源的生效结束时间(在这种情况下，例如但不局限于，默认资源的生效起始时间从资源预留成功或给UE下发切换命令(HO CMD)或条件切换命令(CHO CMD)成功开始)。该配置信息可以包括一套或多套给UE 20预留的资源，每套资源可以对应相同或不同的生效时间信息。
上行同步信息例如可以是时间提前量(Timing Advance:TA)，或者，测量参数的不同取值与TA的映射关系。测量参数可以包括例如但不局限于以下一个或多个：时间信息，服务小区和/或其一个或多个相邻小区的下行信号的信号质量，UE的地理位置，以及，UE与小区的间隔距离等。这里，时间信息例如可以指几点几分几秒等。下行信号的信号质量例如可以是参考信号接收功率(Reference Signal Received Power：RSRP)值、参考信号接收质量(Reference Signal Receiving Quality：RSRQ)值、信号与干扰加噪声比(Signal to Interference plus Noise Ratio：SINR)值、信道质量指示(Channel Quality Indication:CQI)值和/或信道状态信息(Channel State Information：CSI)值。下行信号的信号质量例如可以是但不局限于单个小区的、单个波束(beam)的和/或多个小区和/或波束的。下行信号的信号质量例如可以是但不局限于基于以下一个或多个测量得到：同步信号块(Synchronization Signal Block：SSB)、信道状态信息参考信号(Channel State Information-Reference Signal：CSI-RS)和解调参考信号(Demodulation Reference Signal：DMRS)等。
如果服务小区100向目标小区110-1、110-2、…、110-N发送的请求消息包括有建议的资源的生效时间信息，则目标小区110-1、110-2、…、110-N可以参考该建议的资源的生效时间信息来设置给UE 20预留的资源的生效时间信息。
如果服务小区100向目标小区110-1、110-2、…、110-N发送的请求消息包括有建议的上行同步信息和/或建议的用于决定上行同步信息的辅助信息，则目标小区110-1、110-2、…、110-N可以参考该建议的上行同步信息和/或辅助信息来设置与目标小区关联的上行同步信息。这里，用于决定上行同步信息的辅助信息例如可以包括但不局限于以下一个或多个：UE 20的位置、速度、移动方向和/或高度信息；服务小区100和/或其相邻小区的下行RSRP；以及，UE 20到服务小区100的TA等。
在步骤S816，服务小区100把从目标小区110-1、110-2、…、110-N收到的配置信息，借助于服务小区100的基站下发给UE 20。例如但不局限于，服务小区100可以通过切换命令(HO CMD)或条件切换命令(CHO CMD)将该配置信息在UE 20进行小区切换之前提前下发给UE 20。
可选地，服务小区100还可以向UE 20下发目标小区110-1、110-2、…、110-N的标识信息，该标识信息例如可以包括但不局限于目标小区110-1、110-2、…、110-N的频点、小区列表和/或波束列表等。
在步骤S820，在接收到服务小区100下发的配置信息，以及，可选地目标小区110-1、110-2、…、110-N的标识信息之后，UE 20在没有网络控制的情况下自主选择要切换的目标小区，并切换到该自主选择的目标小区。为了便于描述，下面将 该自主选择的目标小区称为目标小区110-i。
UE 20可以利用但不局限于三种方案之一来自主选择要切换的目标小区110-i。
在方案一中，UE 20通过执行空闲态的UE所执行的小区重选(CellRe-selection)过程来自主选择要切换的目标小区。具体地，UE 20首先接收服务小区100下发的小区重选参数。该小区重选参数例如可以是服务小区100经由广播信道下发的系统信息中的系统信息块(System Information Block:SIB)2所包括的相关参数，该相关参数例如已经在3GPP TS38.331 V16.2.0协议中详细描述，在此不再对其赘述。或者，该小区重选参数例如可以是服务小区100在无线资源控制(Radio Resource Control：RRC)配置中给UE 20下发的与小区重选相关的参数。然后，UE 20利用所接收的小区重选参数执行小区重选过程，以找出UE 20能够驻留的相邻小区。例如，可以在小区重选过程中测量服务小区100的相邻小区的RSRP，然后仅基于所测量的相邻小区的RSRP来确定UE20能够驻留的相邻小区。或者，例如可以在小区重选过程中测量服务小区100及其相邻小区的RSRP，然后基于所测量的服务小区100及其相邻小区的RSRP，确定UE20能够驻留的相邻小区(比如，满足A3事件的相邻小区，即其RSRP比服务小区100的RSRP高x dB的相邻小区)。最后，UE 20从所找出的相邻小区中，选取一个合适的相邻小区作为要切换的目标小区。这里，该合适的相邻小区例如可以是信号质量最好或优先级最高的相邻小区。或者，可选地，在接收到服务小区100提前下发的目标小区110-1、110-2、…、110-N的标识信息的情况下，该合适的相邻小区例如只能从目标小区110-1、110-2、…、110-N中选取。
在方案二中，UE 20测量服务小区100的至少一个相邻小区的信号质量，或者，测量服务小区100及其至少一个相邻小区的信号质量。UE 20检查该至少一个相邻小区中是否存在其信号质量满足指定的测量事件且其是目标小区110-1、110-2、…、110-N之一。如果检查结果为肯定，则UE 20选取该满足条件的相邻小区作为要切换的目标小区。
这里，所述指定的测量事件由服务小区100提前告知UE 20，其例如可以是但不局限于以下测量事件中一个或多个：A1事件、A2事件、A3事件、A4事件、A5事件、A6事件、B1事件和B2事件。其中，A1事件表示服务小区信号质量变得高于门限值，A2事件表示服务小区信号质量变得低于门限值，A3事件表示邻小区高于主服务小区的偏滞，A4事件表示邻小区信号质量高于门限值，A5事件表示服务小区信号质量低于门限值1且邻小区信号质量高于门限值2、A6事件表示邻小区高于主服务小区的偏滞、B1事件表示异系统邻小区信号质量高于门限值，以及，B2事件表示主服务小区质量低于门限值并且异系统邻小区信号质量高于门限值。A1-A6事件和B1-B2事件例如已经在3GPP TS38.331 V16.2.0协议中详细描述，在此不再对其赘述。
在方案三中，与上面的方案一和方案二不同，网络不下发任何参数来影响UE，从而，UE如何选择要切换的目标小区，完全由UE自主决定。
可选地，在UE20切换目标小区110-i之后，如果目标小区110-i是目标小区110-1、110-2、…、110-N之一，则UE20具有目标小区110-i对应的配置信息，从而UE20提前获取了目标小区110-i的C-RNTI和秘钥等信息，因此UE20切换到目标 小区110-i之后，可以直接监听该小区的下行控制信息来接收下行数据。
可选地，在步骤S824，UE 20与自主选择的目标小区110-i进行通信，以告知UE 20已切换到目标小区110-i。
可选地，在告知UE 20已切换到目标小区110-i之后，目标小区110-i随后就可以直接对UE20使用已分配的C-RNTI及相关资源进行下行数据传输和下行控制信息调度。
在上述第一示例性实现的方案中，UE自主选择要切换的目标小区并切换到该自主选择的目标小区，在这个过程中不需要UE上传测量报告和小区下发切换指令等，因此，与现有的网络控制的切换相比，减少了切换所需的信令开销，能够实现UE节能。
图9A示出了按照本申请的第二示例性实现的上行数据传输的方法的示意图。图9A所示的方法900是图8所示的步骤S824的示例性实现。方法900可以包括步骤S904-S920。
在步骤S904，在切换到自主选择的目标小区110-i之后，UE 20向目标小区110-i的基站发送上行信息，以告知UE 20已切换到目标小区110-i。
如果UE 20在切换到目标小区110-i之后立即有上行数据和/或信令要上传，则所述上行信息可以是UE 20立即要上传的上行数据和/或信令。
如果UE 20在切换到目标小区110-i之后没有立即上传的上行数据和/或信令，则所述上行信息可以是一个简化上行信令(Simplified UL Signaling)。图9B示出了按照本申请的实施例的基于简化上行信令的简化切换流程的示意图，其中，当UE从小区1切换到小区2、从小区2切换到小区3和从小区3切换到小区4时，如果在切换之后UE没有立即要上传的上行数据和/或信令，则UE都会发送简化上行信令给本次切换的目标小区，以告知UE已切换该切换的目标小区。
其中，该简化上行信令例如可以是但不局限于以下之一：专用前导码、专用探测参考信号(Sounding Reference Signal：SRS)、专用调度请求(Scheduled Request:SR)、配置资源(Configured Grant：CG)或免资源(Grant Free：GF)发送的上行控制指示(Uplink Control Indication：UCI)、CG或GF发送的MAC控制单元(Control Element：CE)、CG或GF发送的无线资源控制(Radio Resource Control:RRC)消息、包含UE标识(例如，C-RNTI)的公共随机接入信道消息、包含UE标识的公共SRS、包含UE标识的公共SR和包含UE标识的资源消息(Grant)。
UE 20向目标小区110-i发送上行信息面临以下几种情形。
在第一种情形中，目标小区110-i是目标小区110-1、110-2、…、110-N的其中之一，并且，服务小区100提前下发给UE 20的目标小区110-i对应的配置信息仅包括给UE 20预留的资源，但不包括该预留的资源对应的生效时间信息和与目标小区110-i关联的上行同步信息。对于第一种情形，UE 20使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)，向目标小区110-i发送上行信息。
在第二种情形中，目标小区110-i是目标小区110-1、110-2、…、110-N的 其中之一，并且，服务小区100提前下发给UE 20的目标小区110-i对应的配置信息包括给UE 20预留的资源和该预留的资源对应的生效时间信息，但不包括与目标小区110-i关联的上行同步信息。对于第二种情形，UE 20首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果生效，则UE 20使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)向目标小区110-i发送上行信息。如果不生效，则UE 20通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区110-i发送上行信息。
在第三种情形中，目标小区110-i是目标小区110-1、110-2、…、110-N的其中之一，并且，服务小区100提前下发给UE 20的目标小区110-i对应的配置信息包括给UE 20预留的资源和与目标小区110-i关联的上行同步信息，但不包括该预留的资源对应的生效时间信息(在这种情况下，默认给UE20预留的资源一直生效)。对于第三种情形，UE 20使用该预留的资源基于该上行同步信息向目标小区110-i发送上行信息。
其中，如果该上行同步信息是TA，则UE 20使用该预留的资源按照该TA向目标小区110-i发送上行信息。
如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE 20首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向目标小区110-i发送上行信息。
图9C示出了按照本申请的实施例的示例性的映射关系的示意图。在图9C所示的示例性的映射关系中，测量参数是下行RSRP，其中，示例性的映射关系为{{下行RSRP<-90dbm,TA＝1},{-90dbm<＝下行RSRP<＝-110dbm,TA＝2},{下行RSRP>-110dbm,TA＝3}}。对于图9C所示的示例性的映射关系，UE 20首先测量下行RSRP的实际值。然后，UE 20从该示例性的映射关系中检索出与下行RSRP的实际值对应的TA，其中，当下行RSRP的实际值<-90dbm时对应的TA等于1，当-90dbm<＝下行RSRP的实际值<＝-110dbm时对应的TA等于2，以及，当下行RSRP的实际值>-110dbm时对应的TA等于3。最后，UE 20使用该预留的资源按照检索的TA向目标小区110-i发送上行信息。
在第四种情形中，目标小区110-i是目标小区110-1、110-2、…、110-N的其中之一，并且，服务小区100提前下发给UE 20的目标小区110-i对应的配置信息包括给UE 20预留的资源、该预留的资源对应的生效时间信息和与目标小区110-i关联的上行同步信息。对于第四种情形，UE 20首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果不生效，则UE 20通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区110-i发送上行信息。如果生效，则UE 20使用该预留的资源基于该上行同步信息向目标小区110-i发送上行信息。其中，如果该上行同步信息是TA，则UE 20使用该预留的资源按照该TA向目标小区110-i发送上行信息。如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE 20首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向目标小区 110-i发送上行信息。
在第五种情形中，目标小区110-i不是目标小区110-1、110-2、…、110-N。在这种情况下，UE 20通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区110-i发送上行信息。
在步骤S908，在接收到UE 20发送的上行信息之后，目标小区110-i将UE20登记为已切换到目标小区110-i的UE。
可选地，当上行信息是UE 20通过基于竞争的随机接入过程发送的时，目标小区110-i向UE 20分配相应的资源。
可选地，方法900还可以包括步骤S912和S916。在步骤S912，在UE 20发送上行信息的同时或之后，UE 20向目标小区110-i的基站发送请求消息以请求目标小区110-i给UE 20分配资源。在步骤S916，在接收到来自UE 20的请求消息之后，目标小区110-i给UE 20分配相应的资源。
可选地，方法900还可以包括步骤S920。在步骤S920，在切换到目标小区110-i之前或之后，UE 20向服务小区100的基站发送通知信息，以通知UE 20已切换到目标小区110-i。例如但不局限于，对于硬切换情形，在UE 20使用目标小区110-i分配的资源与目标小区110-i进行通信之前(例如但不局限于，在收到切换命令(HO CMD)或条件切换命令(CHO CMD)之后且在离开服务小区100之前)，UE 20向服务小区100发送通知信息以指示UE20已切换到另一小区。例如但不局限于，对于软切换情形，在UE20切换到目标小区110-i之前或之后，在UE20从目标小区110-i接收到指示与原服务小区断开的消息的情况下，UE 20向服务小区100发送通知信息以指示UE20已切换到另一小区。
通过步骤S920，可以使得服务小区100及时断开与原服务小区的连接以停止对UE的下行调度和释放分配给UE 20的资源给其它UE使用，从而提高资源利用率。
在上述第二示例性实现的方案中，由于给UE提前下发潜在目标小区给UE预留的资源，因此UE在驻留和切换到这些潜在目标小区之后，可以直接使用提前下发的资源进行上行数据或信令传输，从而能够加快上行数据或信令的传输。
此外，在上述第二示例性实现的方案中，UE在驻留和切换到新小区之后就发送上行信息(例如，UE立即要上传的上行数据和/或信令，或者，简化上行信令(simplified UL signaling))，从而该新小区能够快速获知UE当前在哪个小区下，并及时对UE进行下行控制信息发送和数据调度，因此，在节省UE的切换信令开销的情况下仍然能够满足下行数据的快速调度/发送。
图10A示出了基于竞争的4步随机接入过程的示意图。如图10A所示，基于竞争的4步随机接入过程包括步骤S1000-S1012。在步骤S1000，UE向小区的基站gNB发送随机接入前导码(Random Access Preamble)(即消息1，Msg1)。在步骤S1004，小区的基站gNB向UE发送随机接入响应(Random Access Response:RAR)(即消息2，Msg2)。在步骤S1008，UE在上行共享信道上进行第一次上行传输(即消息3，Msg3)。在步骤S1012，小区的基站gNB向UE发送竞争解决消息(即消息 4，Msg4)。
图10B示出了基于竞争的2步随机接入过程的示意图。如图10B所示，基于竞争的2步随机接入过程包括步骤S1020-S1024。在步骤S1020，UE向小区的基站gNB发送随机接入前导码前导码(Random Access Preamble)和物理上行共享信道(Physical Uplink Shared Channel:PUSCH)数据(即消息A，Msg A)。在步骤S1024，小区的基站gNB向UE发送发送竞争解决消息(即消息B，Msg B)。
图10C示出了基于非竞争的4步随机接入过程的示意图。如图10C所示，基于非竞争的4步随机接入过程包括步骤S1040-S1052。在步骤S1040，小区的基站通过下行专用信令向UE指派非竞争的随机接入前导码(即消息0，Msg0)。在步骤S1044，UE在RACH上发送指派的随机接入前导码(Msg1)。在步骤S1048，小区的基站gNB向UE发送RAR(Msg2)。在步骤S1052，UE在上行共享信道上进行第一次上行传输(Msg3)。
图10D示出了基于非竞争的2步随机接入过程的示意图。如图10D所示，基于非竞争的2步随机接入过程包括步骤S1070-S1078。在步骤S1070，小区的基站通过下行专用信令向UE指派非竞争的随机接入前导码和PUSCH(即消息0，Msg0)。在步骤S1074，UE在RACH上发送指派的随机接入前导码和上行数据(Msg A)。在步骤S1078，小区的基站gNB向UE发送RAR(Msg B)。
图11A示出了按照本申请的第三示例性实现的下行数据传输的方法的示意图。图11A所示的方法1100可以包括步骤S1104-S1116。
在步骤S1104，在UE 20与目标小区110-i进行通信以告知UE 20已切换到目标小区110-i之时或之后，UE 20向目标小区110-i发送服务小区100的标识和UE 20在服务小区100中的标识(例如，C-RNTI等)。
在步骤S1108，在接收到服务小区100的标识和UE 20在服务小区100中的标识之后，目标小区110-i发起UE上下文提取(UE Context Fetch)流程，向服务小区100发送请求消息以请求与UE 20相关的数据。其中，与UE 20相关的数据可以包括例如但不局限于原服务小区100已接收但还未成功发送给UE20的下行数据、原服务小区100已成功从UE 20接收但还未成功转发给核心网CN网元的上行数据和/或UE 20的上下文信息等。
在步骤S1112，在收到来自目标小区110-i的请求消息之后，服务小区100将与UE 20相关的数据发送给目标小区110-i。
在步骤S1116，在收到与UE 20相关的数据之后，如果与UE 20相关的数据包括有要发送给UE 20的下行数据，则目标小区110-i向UE 20发送该下行数据。
通过步骤S1104-步骤S1116，在UE在进行数据传输时移动离开原服务小区并切换到另一小区的情况下，能够把积压在原服务小区中的UE的下行数据发送给UE，保证不发生丢包现象。步骤S1104-步骤S1116是可选的。
可选地，方法1100还可以包括步骤S1120-步骤S1128，以使得UE20能够向当前服务小区(即目标小区110-i)索要更多潜在目标小区的配置信息。
在步骤S1120，UE 20向目标小区110-i发送请求消息以请求更多目标小区的配置信息。
在步骤S1124，目标小区110-i与UE 20有可能会切换的一个或多个目标小区协商，以获取该一个或多个目标小区对应的配置信息。其中，该配置信息包括给UE20预留的资源。或者，该配置信息包括给UE20预留的资源，以及，该预留的资源对应的生效时间信息和/或与目标小区关联的上行同步信息。
在步骤S1128，目标小区110-i把该一个或多个目标小区对应的配置信息发送给UE20。
可选地，方法1100还可以包括步骤S1132-步骤S1140，以向UE20配置更多潜在目标小区的配置信息。
在步骤S1132，目标小区110-i获取原先给UE20下发的目标小区110-1、110-2、…、110-N对应的配置信息。对于该原先给UE20下发的目标小区110-1、110-2、…、110-N对应的配置信息，目标小区110-i例如可以通过UE20上传、向UE20索要或者向原服务小区100索要等来获得。
在步骤S1136，在获取目标小区110-1、110-2、…、110-N对应的配置信息之后，目标小区110-i判断是否需要向UE20下发更多目标小区的配置信息。
在步骤S1140，如果步骤S736的判断结果为肯定，则目标小区110-i获取更多目标小区对应的配置信息并下发给UE20。
以图11B为例，小区1给UE提前下发目标小区2、3和4的配置信息。在UE切换并接入目标小区4或即将离开目标小区4时，目标小区4通过UE的上传、向UE索要或向小区1索要等来获得小区1给UE提前下发的目标小区2、3和4的配置信息，若判断UE后续有可能会进一步移动到目标小区5和6、但该UE还没有目标小区5和6的配置信息，则目标小区4可以进一步与目标小区5和6协商资源并通过目标小区4提前下发给该UE，这样后续该UE移动并切换到小区5和6时，在切换后没有立即要上传的数据或信令的情况下仅需发送简化上行信令(simplified UL signaling)即可，无需频繁获取目标小区的配置信息。
在上面的示例性实现中，以连接态的UE为例描述了UE自主控制的用于小区切换的方案，然而，本申请并不局限于此。在本申请的其它一些实施例中，上面描述的UE自主控制的用于小区切换的方案也适用于空闲态的UE和非激活态的UE。
图12A示出了按照本申请的第四示例性实现的用于小区切换的方法的示意图。图12A所示的方法1200可以包括步骤S1204-S1228。
在步骤S1204，服务小区100A确定连接态的UE 20A的目标小区112-1、112-2、…、112-N。N是正整数。目标小区112-1、112-2、…、112-N是UE 20A有可能会切换到的小区，其数量可以是一个或多个。例如但不局限于，服务小区100A可以通过UE 20A的移动轨迹等来预测得到目标小区112-1、112-2、…、112-N。
在步骤S1208，服务小区100A分别向目标小区112-1、112-2、…、112-N 发送切换准备(HO preparation)消息。该切换准备消息请求目标小区给UE 20A预留资源。
在步骤S1212，目标小区112-1、112-2、…、112-N分别向服务小区100A发送包含配置信息的切换准备响应(HO preparation response)。目标小区112-1、112-2、…、112-N各自发送的配置信息可以相同，也可以不同。
该配置信息可以包括给UE 20A预留的资源，以及，所预留的资源对应的生效时间信息和/或与目标小区关联的上行同步信息。
所预留的资源可以包括例如但不局限于以下至少之一：C-RNTI、SR、RACH资源(例如，公共或专用前导码等)、SRB或DRB配置、资源(grant)或CG或GF配置、秘钥、压缩算法配置、PHY和/或MAC和/或RLC和/或PDCP和/或SDAP配置等。
所述生效时间信息例如可以是所预留的资源的生效起始时间，或者，所预留的资源生效的时间段，该时间段由生效起始时间和生效结束时间限定，或者，所预留的资源的生效结束时间(在这种情况下，例如但不局限于，默认资源的生效起始时间从资源预留成功或给UE下发切换命令(HO CMD)或条件切换命令(CHO CMD)成功开始)。该配置信息可以包括一套或多套给UE 20A预留的资源，每套资源可以对应相同或不同的生效时间信息。
所述上行同步信息例如可以是TA，或者，测量参数的不同取值与TA的映射关系。测量参数可以包括例如但不局限于以下一个或多个：时间信息，服务小区和/或其一个或多个相邻小区的下行信号的信号质量，UE的地理位置，以及，UE与小区的间隔距离等。这里，时间信息例如可以指几点几分几秒等。下行信号的信号质量例如可以是但不局限于RSRP值、RSRQ值、SINR值、CQI值和/或CSI值等。下行信号的信号质量例如可以是但不局限于单个小区的、单个波束(beam)的和/或多个小区和/或波束的。下行信号的信号质量例如可以是但不局限于基于以下一个或多个测量得到：SSB、CSI-RS和DMRS等。
可选地，服务小区100A向目标小区112-1、112-2、…、112-N发送的请求消息还包括建议的资源的生效时间信息，则目标小区112-1、112-2、…、112-N可以参考该建议的资源的生效时间信息来设置给UE 20A预留的资源的生效时间信息。
可选地，服务小区100A向目标小区112-1、112-2、…、112-N发送的请求消息还包括建议的上行同步信息和/或建议的用于决定上行同步信息的辅助信息，则目标小区112-1、112-2、…、112-N可以参考该建议的上行同步信息和/或辅助信息来设置与目标小区关联的上行同步信息。这里，用于决定上行同步信息的辅助信息例如可以包括但不局限于以下一个或多个：UE 20A的位置、速度、移动方向和/或高度信息；服务小区100A和/或其相邻小区的下行RSRP；以及，UE 20A到服务小区100A的TA等。
在步骤S1216，服务小区100A把从目标小区112-1、112-2、…、112-N收到的配置信息，借助于服务小区100A的基站下发给UE 20A。例如但不局限于，服务小区100A可以通过切换命令(HO CMD)或条件切换命令(CHO CMD)将该配置信息在UE 20A进行小区切换之前提前下发给UE 20A。
可选地，服务小区100A还可以向UE 20A下发目标小区112-1、112-2、…、112-N的标识信息，该标识信息例如可以包括但不局限于目标小区112-1、112-2、…、112-N的频点、小区列表和/或波束列表等。
在步骤S1220，UE 20A获取要切换的目标小区。其中，对于常规切换过程，服务小区100A确定UE 20A要切换的目标小区并把该确定的目标小区的标识下发给UE 20A，以使UE 20A获取要切换的目标小区。对于CHO过程，UE 20A根据服务小区100A之前下发的条件切换配置，测量服务小区100A及其相邻小区的信号质量，或者仅测量服务小区100A的相邻小区的信号质量；如果某一相邻小区的信号质量满足条件切换配置中指定的测量事件，则UE 20A将该某一相邻小区确定为要切换的目标小区。在常规切换过程中服务小区100A确定UE 20A要切换的目标小区和在CHO过程中UE 20A确定要切换的目标小区是现有技术，其例如但不限于在3GPP TS38.300 V16.3.0section 9.2.3.2记载的小区切换过程和3GPP TS38.300 V16.3.0记载的CHO过程等中已描述，因此不再对其进行赘述。为了便于叙述，下面将UE 20A要切换的目标小区称为目标小区112-i。
在步骤S1224，在驻留和切换到目标小区112-i之后，UE 20A向目标小区112-i的基站发送上行信息，以告知UE 20A已切换到目标小区112-i。
如果UE 20A在切换到目标小区112-i之后立即有上行数据和/或信令要上传，则所述上行信息可以是UE 20A立即要上传的上行数据和/或信令。
如果UE 20A在切换到目标小区112-i之后没有立即上传的上行数据和/或信令，则所述上行信息是一个用于通知UE 20A已切换到目标小区112-i的常规上行信令，所述常规上行信令例如可以包括但不局限于RRC连接重配置完成(RRC Connection Reconfiguration Complete)信令等。
UE 20A向目标小区112-i发送上行信息面临以下几种情形。
在第一种情形中，目标小区112-i是目标小区112-1、112-2、…、112-N的其中之一，并且，服务小区100A提前下发给UE 20A的目标小区112-i对应的配置信息包括给UE 20预留的资源和该预留的资源对应的生效时间信息，但不包括与目标小区112-i关联的上行同步信息。对于第一种情形，UE 20A首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果生效，则UE 20A使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)向目标小区112-i发送上行信息。如果不生效，则UE 20A通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区112-i发送上行信息。
在第二种情形中，目标小区112-i是目标小区112-1、112-2、…、112-N的其中之一，并且，服务小区100A提前下发给UE 20A的目标小区112-i对应的配置信息包括给UE 20A预留的资源和与目标小区112-i关联的上行同步信息，但不包括该预留的资源对应的生效时间信息(在这种情况下，默认给UE20A预留的资源一直生效)。对于第二种情形，UE 20A使用该预留的资源基于该上行同步信息向目标小区112-i发送上行信息。
其中，如果该上行同步信息是TA，则UE 20A使用该预留的资源按照该 TA向目标小区112-i发送上行信息。
如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE 20A首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向目标小区112-i发送上行信息。
在第三种情形中，目标小区112-i是目标小区112-1、112-2、…、112-N的其中之一，并且，服务小区100A提前下发给UE 20A的目标小区112-i对应的配置信息包括给UE 20A预留的资源、该预留的资源对应的生效时间信息和与目标小区112-i关联的上行同步信息。对于第三种情形，UE 20A首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果不生效，则UE 20A通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区112-i发送上行信息。如果生效，则UE 20A使用该预留的资源基于该上行同步信息向目标小区112-i发送上行信息。其中，如果该上行同步信息是TA，则UE 20A使用该预留的资源按照该TA向目标小区112-i发送上行信息。如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE 20A首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向目标小区112-i发送上行信息。
在第四种情形中，目标小区110-i不是目标小区112-1、112-2、…、112-N。在这种情况下，UE 20A通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区112-i发送上行信息。
在步骤S1228，在接收到UE 20A发送的上行信息之后，目标小区112-i将UE 20A登记为已切换到目标小区112-i的UE。
图12B示出了按照本申请的第五示例性实现的用于小区切换的方法的示意图，图12B所示的方法1240可以包括步骤S1244-S1268。
在步骤S1244，服务小区100B确定连接态的UE 20B的目标小区114-1、114-2、…、114-N。N是正整数。目标小区114-1、114-2、…、114-N是UE 20B有可能会切换到的小区，其数量可以是一个或多个。例如但不局限于，服务小区100B可以通过UE 20B的移动轨迹等来预测得到目标小区114-1、114-2、…、114-N。
在步骤S1248，服务小区100B分别向目标小区114-1、114-2、…、114-N发送切换准备(HO preparation)消息。该切换准备消息请求目标小区给UE 20B预留资源。
在步骤S1252，目标小区114-1、114-2、…、114-N分别向服务小区100B发送包含配置信息的切换准备响应(HO preparation response)。目标小区114-1、114-2、…、114-N各自发送的配置信息可以相同，也可以不同。
该配置信息可以仅包括给UE 20B预留的资源。所预留的资源可以包括例如但不局限于以下至少之一：C-RNTI、SR、RACH资源(例如，公共或专用前导码等)、SRB或DRB配置、资源(grant)或CG或GF配置、秘钥、压缩算法配置、PHY和/或MAC和/或RLC和/或PDCP和/或SDAP配置等。
或者，该配置信息可以包括给UE 20B预留的资源，以及，所预留的资源 对应的生效时间信息和/或与目标小区关联的上行同步信息。
所述生效时间信息例如可以是所预留的资源的生效起始时间，或者，所预留的资源生效的时间段，该时间段由生效起始时间和生效结束时间限定，或者，所预留的资源的生效结束时间(在这种情况下，例如但不局限于，默认资源的生效起始时间从资源预留成功或给UE下发切换命令(HO CMD)或条件切换命令(CHO CMD)成功开始)。该配置信息可以包括一套或多套给UE 20B预留的资源，每套资源可以对应相同或不同的生效时间信息。
所述上行同步信息例如可以是TA，或者，测量参数的不同取值与TA的映射关系。测量参数可以包括例如但不局限于以下一个或多个：时间信息，服务小区和/或其一个或多个相邻小区的下行信号的信号质量，UE的地理位置，以及，UE与小区的间隔距离等。这里，时间信息例如可以指几点几分几秒等。下行信号的信号质量例如可以是但不局限于RSRP值、RSRQ值、SINR值、CQI值和/或CSI值等。下行信号的信号质量例如可以是但不局限于单个小区的、单个波束(beam)的和/或多个小区和/或波束的。下行信号的信号质量例如可以是但不局限于基于以下一个或多个测量得到：SSB、CSI-RS和DMRS等。
可选地，服务小区100B向目标小区114-1、114-2、…、114-N发送的请求消息还包括建议的资源的生效时间信息，则目标小区114-1、114-2、…、114-N可以参考该建议的资源的生效时间信息来设置给UE 20B预留的资源的生效时间信息。
可选地，服务小区100B向目标小区114-1、114-2、…、114-N发送的请求消息还包括建议的上行同步信息和/或建议的用于决定上行同步信息的辅助信息，则目标小区114-1、114-2、…、114-N可以参考该建议的上行同步信息和/或辅助信息来设置与目标小区关联的上行同步信息。这里，用于决定上行同步信息的辅助信息例如可以包括但不局限于以下一个或多个：UE 20B的位置、速度、移动方向和/或高度信息；服务小区100B和/或其相邻小区的下行RSRP；以及，UE 20B到服务小区100B的TA等。
在步骤S1256，服务小区100B把从目标小区11B-1、11B-2、…、11B-N收到的配置信息，借助于服务小区100B的基站下发给UE 20B。例如但不局限于，服务小区100B可以通过切换命令(HO CMD)或条件切换命令(CHO CMD)将该配置信息在UE 20B进行小区切换之前提前下发给UE 20B。
可选地，服务小区100B还可以向UE 20B下发目标小区114-1、114-2、…、114-N的标识信息，该标识信息例如可以包括但不局限于目标小区114-1、114-2、…、114-N的频点、小区列表和/或波束列表等。
在步骤S1260，UE 20B获取要切换的目标小区。其中，对于常规切换过程，服务小区100B确定UE 20B要切换的目标小区并把该确定的目标小区的标识下发给UE 20B，以使UE 20B获取要切换的目标小区。对于CHO过程，UE 20B根据服务小区100B之前下发的CHO配置，测量服务小区100B及其相邻小区的信号质量，或者仅测量服务小区100B的相邻小区的信号质量；如果某一相邻小区的信号质量满足CHO配置中指定的测量事件，则UE 20B将该某一相邻小区确定为要切换的目标小区。在常规切换过程中服务小区100B确定UE 20B要切换的目标小区和在CHO过程中 UE 20B确定要切换的目标小区是现有技术，其例如但不限于在3GPP TS38.300 V16.3.0 section 9.2.3.2记载的小区切换过程和3GPP TS38.300 V16.3.0记载的CHO过程等中已描述，在此不再对此赘述。为了便于叙述，下面将UE 20B要切换的目标小区称为目标小区114-i。
在步骤S1264，在驻留和切换到目标小区114-i之后，UE 20B向目标小区114-i的基站发送上行信息，以告知UE 20B已切换到目标小区114-i。
如果UE 20B在切换到目标小区114-i之后立即有上行数据和/或信令要上传，则所述上行信息可以是UE 20B立即要上传的上行数据和/或信令。
如果UE 20B在切换到目标小区114-i之后没有立即上传的上行数据和/或信令，则所述上行信息是一个简化上行信令(Simplified UL Signaling)。
其中，该简化上行信令例如可以是但不局限于以下之一：专用前导码、专用SRS、专用SR、CG或GF发送的UCI、CG或GF发送的MAC CE、CG或GF发送的RRC消息、包含UE标识(例如，C-RNTI)的公共随机接入信道消息、包含UE标识的公共SRS、包含UE标识的公共SR和包含UE标识的资源消息(Grant)。
UE 20B向目标小区114-i发送上行信息面临以下几种情形。
在第一种情形中，目标小区114-i是目标小区114-1、114-2、…、114-N的其中之一，并且，服务小区100B提前下发给UE 20B的目标小区114-i对应的配置信息仅包括给UE 20B预留的资源，但不包括该预留的资源对应的生效时间信息和与目标小区114-i关联的上行同步信息。对于第一种情形，UE 20B使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)，向目标小区114-i发送上行信息。
在第二种情形中，目标小区114-i是目标小区114-1、114-2、…、114-N的其中之一，并且，服务小区100B提前下发给UE 20B的目标小区114-i对应的配置信息包括给UE 20B预留的资源和该预留的资源对应的生效时间信息，但不包括与目标小区114-i关联的上行同步信息。对于第二种情形，UE 20B首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果生效，则UE 20B使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)向目标小区114-i发送上行信息。如果不生效，则UE 20B通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区114-i发送上行信息。
在第三种情形中，目标小区114-i是目标小区114-1、114-2、…、114-N的其中之一，并且，服务小区100B提前下发给UE 20B的目标小区114-i对应的配置信息包括给UE 20B预留的资源和与目标小区114-i关联的上行同步信息，但不包括该预留的资源对应的生效时间信息(在这种情况下，默认给UE20B预留的资源一直生效)。对于第三种情形，UE20B使用该预留的资源基于该上行同步信息向目标小区114-i发送上行信息。
其中，如果该上行同步信息是TA，则UE 20B使用该预留的资源按照该TA向目标小区114-i发送上行信息。
如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE 20B 首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向目标小区114-i发送上行信息。
在第四种情形中，目标小区114-i是目标小区114-1、114-2、…、114-N的其中之一，并且，服务小区100提前下发给UE 20B的目标小区114-i对应的配置信息包括给UE 20B预留的资源、该预留的资源对应的生效时间信息和与目标小区114-i关联的上行同步信息。对于第四种情形，UE 20B首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果不生效，则UE 20B通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区114-i发送上行信息。如果生效，则UE 20B使用该预留的资源基于该上行同步信息向目标小区114-i发送上行信息。其中，如果该上行同步信息是TA，则UE 20B使用该预留的资源按照该TA向目标小区114-i发送上行信息。如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE 20B首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向目标小区114-i发送上行信息。
在第五种情形中，目标小区114-i不是目标小区114-1、114-2、…、114-N。在这种情况下，UE 20B通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向目标小区114-i发送上行信息。
在步骤S1268，在接收到UE 20B发送的上行信息之后，目标小区114-i将UE 20B登记为已切换到目标小区114-i的UE。
下面结合图12C描述本申请的第六示例性实现提供的在非切换场景情况下的通信方法的示意图。图12C所示的通信方法1280可以包括步骤S1284-S1288。
在步骤S1284，服务小区130确定和给驻留在服务小区130中的UE 40下发配置信息。这里，UE 40可以是空闲态的、非激活态的或连接态的UE。当UE 40是空闲态的UE或非激活态的UE时，服务小区130例如可以但不局限于经由广播信道携带的系统信息中的SIB向UE 40或UE 40所属的UE组下发所述配置信息，或者，在UE40转入空闲态或非激活态之前，即在UE40处于连接态时，服务小区130经由RRC或非接入层(Non-Access Stratum：NAS)信令向UE 40下发所述配置信息，然后，UE40在转入空闲态或非激活态之后保留所接收的配置信息。当UE 40是连接态的UE时，服务小区130例如可以但不局限于经由广播信道携带的系统信息中的SIB或经由RRC信令等向UE 40下发所述配置信息。
所述配置信息例如可以仅包括服务小区130给UE 40或UE 40所属的UE组预留的资源。或者，所述配置信息例如可以包括服务小区130给UE 40或UE 40所属的UE组预留的资源，以及，该预留的资源对应的生效时间信息和/或与服务小区130关联的上行同步信息。
所述预留的资源例如可以包括但不局限于以下至少之一：C-RNTI、SR、RACH资源(例如，公共或专用前导码等)、SRB或DRB配置、资源(grant)或CG或GF配置等。
所述生效时间信息例如可以是所预留的资源的生效起始时间，或者，所预 留的资源的由生效起始时间和生效结束时间限定的时间段，或者，所预留的资源的生效结束时间(例如但不局限于，默认生效开始时间从资源预留成功或给UE40下发配置信息成功开始)。该配置信息可以包括一套或多套给UE 40预留的资源，每套资源可以对应相同或不同的生效时间信息。
所述上行同步信息例如可以是TA，或者，测量参数的不同取值与TA的映射关系。测量参数可以包括例如但不局限于以下一个或多个：时间信息，服务小区和/或其一个或多个相邻小区的下行信号的信号质量，UE的地理位置，以及，UE与小区的间隔距离等。这里，时间信息例如可以指几点几分几秒等。下行信号的信号质量例如可以是但不局限于RSRP值、RSRQ值、SINR值、CQI值和/或CSI值等。下行信号的信号质量例如可以是但不局限于单个小区的、单个波束(beam)的和/或多个小区和/或波束的。下行信号的信号质量例如可以是但不局限于基于以下一个或多个测量得到：SSB、CSI-RS和DMRS等。
在步骤S1288，在接收到服务小区130下发的配置信息之后，当UE 40欲向服务小区130发送上行数据和/或信令时，UE 40基于所接收的配置信息向服务小区130发送所述上行数据和/或信令。
UE 40基于所接收的配置信息向服务小区130发送所述上行数据和/或信令面临以下几种情形。
在第一种情形中，服务小区130给UE 40下发的配置信息仅包括给UE 40或UE40所属的UE组预留的资源，但不包括该预留的资源对应的生效时间信息和与服务小区130关联的上行同步信息，则UE 40使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)，向服务小区130发送上行数据和/或信令。
在第二种情形中，服务小区130给UE 40下发的配置信息包括给UE 40或UE40所属的UE组预留的资源和该预留的资源对应的生效时间信息，但不包括与服务小区130关联的上行同步信息，则UE40首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果生效，则UE 40使用该预留的资源通过基于非竞争的随机接入过程(例如，图10C或图10D所示的基于非竞争的随机接入过程)向服务小区130发送上行数据和/或信令。如果不生效，则UE 40通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向服务小区130发送上行数据和/或信令。
在第三种情形中，服务小区130给UE 40下发的配置信息包括给UE 40或UE40所属的UE组预留的资源和与服务小区130关联的上行同步信息，但不包括该预留的资源对应的生效时间信息(在这种情况下，默认给UE40预留的资源一直生效)，则UE 40使用该预留的资源基于该上行同步信息向服务小区130发送上行数据和/或信令。
其中，如果该上行同步信息是TA，则UE40使用该预留的资源按照该TA向服务小区130发送上行数据和/或信令。
如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE40首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最 后使用该预留的资源按照该检索的TA向服务小区130发送上行数据和/或信令。
在第四种情形中，服务小区130给UE 40下发的配置信息包括给UE 40或UE40所属的UE组预留的资源、该预留的资源对应的生效时间信息和与服务小区130关联的上行同步信息。UE40首先基于该预留的资源对应的生效时间信息判断该预留的资源当前是否生效。如果不生效，则UE 40通过基于竞争的随机接入过程(例如，图10A或图10B所示的基于竞争的随机接入过程)向服务小区130发送上行数据和/或信令。如果生效，则UE 40使用该预留的资源基于该上行同步信息向服务小区130发送上行数据和/或信令。其中，如果该上行同步信息是TA，则UE40使用该预留的资源按照该TA向服务小区130发送上行数据和/或信令。如果该上行同步信息是测量参数的不同取值与TA的映射关系，则UE40首先获取测量参数的实际值，然后从该映射关系中检索出与该实际值对应的TA，最后使用该预留的资源按照该检索的TA向服务小区130发送上行数据和/或信令。
在本实施例中，在非切换场景下服务小区提前给驻留在其内的UE下发配置信息，因此，在UE向服务小区发送上行数据和/或信令时，如果服务小区给UE预留的资源生效且该配置信息包括有与服务小区关联的上行同步信息，则UE能够不经过随机接入过程直接使用该预留的资源按照与服务小区关联的上行同步信息向服务小区发送上行数据和/或信令，从而加快上行数据和信令的传输。
图13示出了按照本申请的实施例的通信装置的示意图。图13所示的通信装置1300例如可以是但不局限于芯片等。通信装置1300可以包括通信接口1310和逻辑电路1320。
当通信装置1300位于UE中时，通信装置1300的通信接口1310从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的。通信装置1300的逻辑电路1320例如可以如图5A的方法500所示的，选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一，以及，根据所述选择切换到所述第一目标小区等。
当通信装置1300位于服务小区的基站中时，通信装置1300的逻辑电路1320例如可以如图5D的方法530中所示的，确定目标小区。通信装置1300的通信接口1310例如可以执行以下等操作：向所述目标小区发送请求消息，所述请求消息请求所述目标小区给UE预留资源；从所述目标小区接收配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息；以及，向所述UE发送所述配置信息。
当通信装置1300位于目标小区的基站中时，通信装置1300的通信接口1310例如可以从服务小区接收请求消息，所述请求消息请求目标小区给UE预留资源，以及，向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。通信装置1300的逻辑电路1320例如可以如图5E的方法560中所示出的，当接收所述UE的上行信息时将所述UE登记为切换到所述目标小区的UE。
图14示出了按照本申请的实施例的通信设备的示意图。图14所示的通信设备1400可以包括处理器1410和与处理器1410连接的存储器1420。存储器1420存储有程序指令，所述程序指令当被处理器1410执行时使得处理器1410执行图5A所示的方法500，或者图5D所示的方法530，或者图5E所示的方法560。处理器1410可以是但不限于通用处理器、数字信号处理器(Digital Signal Processor:DSP)、专用集成电路(Application Specific Integrated Circuit:ASIC)、现场可编程门阵列(Field Programmable Gate Array:FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。通用处理器既可以是微处理器或者该处理器，也可以是任何常规的处理器等。存储器1420例如可以是但不局限于：便携式计算机磁盘、硬盘、只读存储器(Read-Only Memory:ROM)、随机存取存储器(Random Access Memory:RAM)、可擦式可编程只读存储器(Electrically Erasable Programmable read only memory:EPROM)、光纤、便携式紧凑磁盘只读存储器(Compact Disc Read-Only Memory：CD-ROM)、光存储器件、磁存储器件、或者上述的任意合适的组合。处理器和存储器可以分立，也可以集成在一起。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一 台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
本申请实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时使得处理器执行用于小区切换的方法，该方法包括上述各个实施例所描述的方案中的至少之一。所述处理器可以是但不限于通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器既可以是微处理器或者该处理器，也可以是任何常规的处理器等。
本申请实施例的计算机存储介质，可以采用一个或多个计算机可读的介质的任意组合。计算机可读介质可以是计算机可读信号介质或者计算机可读存储介质。计算机可读存储介质例如可以是，但不限于，电、磁、光、电磁、红外线、或半导体的系统、装置或器件，或者任意以上的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括：具有一个或多个导线的电连接、便携式计算机磁盘、硬盘、RAM、ROM、EPROM、光纤、CD-ROM、光存储器件、磁存储器件、或者上述的任意合适的组合。在本文件中，计算机可读存储介质可以是任何包含或存储程序的有形介质，该程序可以被指令执行系统、装置或者器件使用或者与其结合使用。
计算机可读的信号介质可以包括在基带中或者作为载波一部分传播的数据信号，其中承载了计算机可读的程序代码。这种传播的数据信号可以采用多种形式，包括但不限于电磁信号、光信号或上述的任意合适的组合。计算机可读的信号介质还可以是计算机可读存储介质以外的任何计算机可读介质，该计算机可读介质可以发送、传播或者传输用于由指令执行系统、装置或者器件使用或者与其结合使用的程序。
计算机可读介质上包含的程序代码可以用任何适当的介质传输，包括、但不限于无线、电线、光缆、射频(Radio Frequency：RF)等，或者上述的任意合适的组合。
可以以一种或多种程序设计语言或其组合来编写用于执行本申请操作的计算机程序代码，所述程序设计语言包括例如但不局限于面向对象的程序设计语言—诸如Java、Smalltalk、C++，还包括常规的过程式程序设计语言—诸如“C”语言或类似的程序设计语言等。程序代码可以完全地在用户计算机上执行、部分地在用户计算机上执行、作为一个独立的软件包执行、部分在用户计算机上部分在远程计算机上执行、或者完全在远程计算机或服务器上执行。在涉及远程计算机的情形中，远程计算机可以通过任意种类的网络，包括局域网(Local Area Network：LAN)或广域网(Wide Area Network：WAN)，连接到用户计算机，或者，可以连接到外部计算机(例如利用因特网服务提供商来通过因特网连接)。
注意，上述仅为本申请的一些实施例及所运用的技术原理。本领域技术人员会理解，本发明不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此，虽然通过以上实施例对本申请进行了较为详细的说明，但是本发明不仅仅限于以上实施例，在不脱离本发明的构思的情况下，还可以包括更多其他等效实施例，均属于本发明的保护范畴。

Claims (40)

  1. 一种用于小区切换的方法，其特征在于，包括：
    终端从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的；
    所述终端选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一；
    所述终端根据所述选择切换到所述第一目标小区；以及
    所述终端根据所述第一目标小区对应的配置信息进行通信。
  2. 如权利要求1所述的方法，其特征在于，所述终端选择要切换的第一目标小区包括：
    所述终端接收所述服务小区下发的小区重选参数；以及
    所述终端基于所接收的小区重选参数执行小区重选过程以选取所述第一目标小区作为要切换的小区。
  3. 如权利要求1所述的方法，其特征在于，所述终端选择要切换的第一目标小区包括：
    所述终端测量至少所述服务小区的相邻小区的信号质量；
    所述终端确定至少第一相邻小区的信号质量使得指定的测量事件被满足且所述第一相邻小区是所述至少一个目标小区的其中之一；以及
    所述终端选取所述第一相邻小区作为所述第一目标小区。
  4. 如权利要求1-3中任一项所述的方法，其特征在于，
    所述终端根据所述第一目标小区对应的配置信息进行通信包括：所述终端发送上行数据或信令。
  5. 如权利要求4所述的方法，其特征在于，
    所述配置信息包括与所述至少一个目标小区关联的上行同步信息。
  6. 如权利要求4所述的方法，其特征在于，
    所述配置信息包括：预留的资源以及所述资源对应的生效时间信息。
  7. 如权利要求5所述的方法，其特征在于，
    所述上行同步信息包括时间提前量。
  8. 如权利要求5所述的方法，其特征在于，
    所述上行同步信息包括测量参数的不同取值与时间提前量的映射关系，
    其中，所述终端上传数据或信令包括：
    所述终端获取所述测量参数的实际值；
    所述终端根据所述测量参数的实际值和与所述第一目标小区关联的所述映射关系，确定所述第一目标小区的时间提前量；以及
    所述终端按照所确定的时间提前量发送所述上行数据或信令。
  9. 如权利要求8所述的方法，其特征在于，
    所述测量参数包括以下至少一种：时间信息、所述第一目标小区和/或其一个或多个相邻小区的下行信号的信号质量、所述终端的地理位置和所述终端与所述第一目标小区的间隔距离。
  10. 如权利要求4-9中任一项所述的方法，其特征在于，所述方法还包括：
    在发送所述上行数据或信令的同时或之后，所述终端向所述第一目标小区发送以下至少之一：
    所述服务小区的标识和所述终端在所述服务小区中的标识；
    所述至少一个目标小区的信息；以及
    用于请求所述终端的更多目标小区的配置信息的消息。
  11. 如权利要求1-10中任一项所述的方法，其特征在于，
    当所述至少一个目标小区为多个时，所述至少一个目标小区包括至少两个串行切换的目标小区。
  12. 一种用于小区切换的方法，其特征在于，包括：
    确定目标小区；
    向所述目标小区发送请求消息，所述请求消息请求所述目标小区给终端预留资源；
    从所述目标小区接收配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息；以及
    向所述终端发送所述配置信息。
  13. 如权利要求12所述的方法，其特征在于，
    所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息。
  14. 如权利要求12或13所述的方法，其特征在于，所述上行同步信息包括时间提前量，或者，测量参数的不同取值与时间提前量之间的映射关系。
  15. 如权利要求14所述的方法，其特征在于
    所述测量参数包括时间信息、小区的下行信号的信号质量、终端的地理位置或者终端与小区的间隔距离。
  16. 一种用于小区切换的方法，其特征在于，包括：
    从服务小区接收请求消息，所述请求消息请求目标小区给终端预留资源；以及
    向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。
  17. 如权利要求16所述的方法，其特征在于，
    所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，
    所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息是基于所建议的资源的生效时间信息，和/或，所建议的上行同步信息和/或用于决定上行同步信息的辅助信息而设置的。
  18. 如权利要求16-17中任一项所述的方法，其特征在于，还包括：
    接收所述终端的上行信息；以及
    将所述终端登记为切换到所述目标小区的终端。
  19. 一种用于小区切换的装置，其特征在于，包括：
    接收单元，用于从服务小区接收至少一个配置信息，所述至少一个配置信息是至少一个目标小区提供的；
    选择单元，用于选择要切换的第一目标小区，其中，所述第一目标小区是所述至少一个目标小区的其中之一；
    切换单元，用于根据所述选择切换到所述第一目标小区；以及
    通信单元，用于根据所述第一目标小区对应的配置信息进行通信。
  20. 如权利要求19所述的装置，其特征在于，
    所述接收单元还用于接收所述服务小区下发的小区重选参数，以及
    所述选择单元进一步用于基于所接收的小区重选参数执行小区重选过程以选取所述第一目标小区作为要切换的小区。
  21. 如权利要求19所述的装置，其特征在于，所述装置还包括：
    测量单元，用于测量至少所述服务小区的相邻小区的信号质量，
    其中，所述选择单元进一步用于确定至少第一相邻小区的信号质量使得指定的测量事件被满足且所述第一相邻小区是所述至少一个目标小区的其中之一，以及，选取所述第一相邻小区作为所述第一目标小区。
  22. 如权利要求19-21中任一项所述的装置，其特征在于，
    所述通信单元进一步用于发送上行数据或信令。
  23. 如权利要求22所述的装置，其特征在于，
    所述配置信息包括与所述至少一个目标小区关联的上行同步信息。
  24. 如权利要求22所述的装置，其特征在于，
    所述配置信息包括：预留的资源以及所述资源对应的生效时间信息。
  25. 如权利要求23所述的装置，其特征在于，
    所述上行同步信息包括时间提前量。
  26. 如权利要求23所述的装置，其特征在于，
    所述上行同步信息包括测量参数的不同取值与时间提前量的映射关系，
    其中，所述装置还包括：
    获取单元，用于获取所述测量参数的实际值；以及
    确定单元，用于根据所述测量参数的实际值和与所述第一目标小区关联的所述映射关系，确定所述第一目标小区的时间提前量，
    其中，所述通信单元进一步用于按照所确定的时间提前量发送所述上行数据或信令。
  27. 如权利要求26所述的装置，其特征在于，
    所述测量参数包括以下至少一种：时间信息、所述第一目标小区和/或其一个或多个相邻小区的下行信号的信号质量、终端的地理位置和终端与所述第一目标小区的间隔距离。
  28. 如权利要求22-27中任一项所述的装置，其特征在于，
    所述通信单元还用于在发送所述上行数据或信令的同时或之后，向所述第一目标小区发送以下至少之一：
    所述服务小区的标识和所述终端在所述服务小区中的标识；
    所述至少一个目标小区的信息；以及
    用于请求所述终端的更多目标小区的配置信息的消息。
  29. 如权利要求19-28中任一项所述的装置，其特征在于，
    当所述至少一个目标小区为多个时，所述至少一个目标小区包括至少两个串行切换的目标小区。
  30. 一种用于小区切换的装置，其特征在于，包括：
    确定单元，用于确定目标小区；
    第一发送单元，用于向所述目标小区发送请求消息，所述请求消息请求所述目标小区给终端预留资源；
    接收单元，用于从所述目标小区接收配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息； 以及
    第二发送单元，用于向所述终端发送所述配置信息。
  31. 如权利要求30所述的装置，其特征在于，
    所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息。
  32. 如权利要求30-31中任一项所述的装置，其特征在于，所述上行同步信息包括时间提前量，或者，测量参数的不同取值与时间提前量之间的映射关系。
  33. 如权利要求32所述的装置，其特征在于
    所述测量参数包括时间信息、小区的下行信号的信号质量、终端的地理位置或者终端与小区的间隔距离。
  34. 一种用于小区切换的装置，其特征在于，包括：
    接收单元，用于从服务小区接收请求消息，所述请求消息请求目标小区给终端预留资源；以及
    发送单元，用于向所述服务小区发送配置信息，所述配置信息包括预留的资源，以及，所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息。
  35. 如权利要求34所述的装置，其特征在于，
    所述请求消息包括建议的资源的生效时间信息，和/或，建议的上行同步信息和/或用于决定上行同步信息的辅助信息，
    所预留的资源对应的生效时间信息和/或与所述目标小区关联的上行同步信息是基于所建议的资源的生效时间信息，和/或，所建议的上行同步信息和/或用于决定上行同步信息的辅助信息而设置的。
  36. 如权利要求34-35中任一项所述的装置，其特征在于，
    所述接收单元还用于接收所述终端的上行信息，
    其中，所述装置还包括登记单元，用于将所述终端登记为切换到所述目标小区的终端。
  37. 一种通信系统，其特征在于，包括：
    权利要求30-33中任一项所述的装置；以及
    权利要求34-36中任一项所述的装置。
  38. 一种通信装置，其特征在于，包括：
    通信接口；以及
    逻辑电路，其执行权利要求1-11中任一项所述的方法或权利要求12-18中任一 项所述的方法。
  39. 一种计算机可读存储介质，其特征在于，其上存储有程序指令，所述程序指令当被处理器执行时使得所述处理器执行权利要求1-18中任一项所述的方法。
  40. 一种通信设备，其特征在于，包括：
    处理器；以及
    存储器，其与所述处理器连接，其中，所述存储器存储有程序指令，所述程序指令当被所述处理器执行时使得所述处理器执行权利要求1-11中任一项所述的方法或者权利要求12-18中任一项所述的方法。
PCT/CN2021/123323 2020-10-31 2021-10-12 用于小区切换的方法和装置 WO2022089200A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21884929.7A EP4221339A4 (en) 2020-10-31 2021-10-12 CELL TRANSFER METHOD AND APPARATUS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011198660.7A CN114449594A (zh) 2020-10-31 2020-10-31 用于小区切换的方法和装置
CN202011198660.7 2020-10-31

Publications (1)

Publication Number Publication Date
WO2022089200A1 true WO2022089200A1 (zh) 2022-05-05

Family

ID=81357314

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/123323 WO2022089200A1 (zh) 2020-10-31 2021-10-12 用于小区切换的方法和装置

Country Status (3)

Country Link
EP (1) EP4221339A4 (zh)
CN (1) CN114449594A (zh)
WO (1) WO2022089200A1 (zh)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017049630A1 (zh) * 2015-09-25 2017-03-30 华为技术有限公司 小区切换方法、装置及设备
CN110493830A (zh) * 2018-05-14 2019-11-22 中兴通讯股份有限公司 切换方法及装置
WO2020024880A1 (zh) * 2018-07-31 2020-02-06 夏普株式会社 由用户设备执行的方法以及用户设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101932052B (zh) * 2009-06-23 2016-08-24 华为技术有限公司 一种切换方法、用户终端及网络侧设备
EP3316625B1 (en) * 2015-08-04 2020-10-07 Huawei Technologies Co., Ltd. Method, network device, and user equipment for secondary base station handover
US12047893B2 (en) * 2019-02-12 2024-07-23 Sony Group Corporation Timing advance validation
CN113491155B (zh) * 2019-02-26 2023-07-07 Lg电子株式会社 基于服务小区质量的移动性条件的放宽

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017049630A1 (zh) * 2015-09-25 2017-03-30 华为技术有限公司 小区切换方法、装置及设备
CN110493830A (zh) * 2018-05-14 2019-11-22 中兴通讯股份有限公司 切换方法及装置
WO2020024880A1 (zh) * 2018-07-31 2020-02-06 夏普株式会社 由用户设备执行的方法以及用户设备

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
3GPP TS 38.300
3GPP TS 38.331
3GPP TS38.300
CMCC: "Remaining Issues of LTE Conditional Handover", 3GPP DRAFT; R2-1905948, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), SOPHIA-ANTIPOLIS CEDEX ; FRANCE, 13 May 2019 (2019-05-13), Reno, USA; 20190513 - 20190517, XP051729440 *
ERICSSON: "Supported scenarios for RACH-less handover", 3GPP DRAFT; R2-1906229 - SUPPORTED SCENARIOS FOR RACH-LESS HO, 3RD GENERATION PARTNERSHIP PROJECT (3GPP),SOPHIA-ANTIPOLIS CEDEX ; FRANCE, 8 May 2019 (2019-05-08), Reno, Nevada, USA; 20190513 - 20190517, XP051740262 *
See also references of EP4221339A4

Also Published As

Publication number Publication date
CN114449594A (zh) 2022-05-06
EP4221339A4 (en) 2024-04-03
EP4221339A1 (en) 2023-08-02

Similar Documents

Publication Publication Date Title
US11805461B2 (en) Method for measurement report event operation and network signaling in UE autonomous handover
US11412429B2 (en) Method for measurement report event operation and network signaling in UE autonomous handover
KR102714036B1 (ko) 무선 통신 디바이스 및 무선 통신 방법
US20210136642A1 (en) Telecommunications system, terminal device, infrastructure equipment and methods
CN111356161B (zh) 无线网络通信方法、基站、终端及通信装置
JP2019532604A (ja) セルハンドオーバ方法、装置、およびシステム
WO2020200135A1 (zh) 一种资源配置方法及通信装置
CN110720238A (zh) 用于实施群组切换的方法和装置
US11516852B2 (en) Random access method of communications apparatus, apparatus, and storage medium
CN104272801A (zh) 小区切换方法、用户设备及基站
CN113747478A (zh) 通信方法及装置
KR20140133463A (ko) 이중 연결성 설정 방법
KR20150046527A (ko) 무선 통신 시스템에서 핸드오버 장치 및 방법
WO2021134522A1 (zh) 用于切换的方法和装置
CN115152277A (zh) 提供网络切片的方法和通信装置
KR20230124693A (ko) 포지셔닝 설정 방법 및 전자 장치
CN112868253B (zh) 条件触发的配置方法及相关产品
WO2022089200A1 (zh) 用于小区切换的方法和装置
WO2022120574A1 (zh) 物理小区的波束管理方法以及相关装置
EP3714614B1 (en) Information transmission method and apparatus, and network device
JP2023523521A (ja) リソースの処理方法、装置、機器及び記憶媒体
WO2024152978A1 (zh) 测量预测方法与装置、终端设备、网络设备和芯片
WO2024221136A1 (zh) 小区切换的方法、终端设备及网络设备
WO2024032271A1 (zh) 通信方法及装置
WO2024216589A1 (zh) 通信的方法和装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21884929

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021884929

Country of ref document: EP

Effective date: 20230427

NENP Non-entry into the national phase

Ref country code: DE