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WO2024207295A1 - Procédé et appareil de réception/transmission d'informations - Google Patents

Procédé et appareil de réception/transmission d'informations Download PDF

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Publication number
WO2024207295A1
WO2024207295A1 PCT/CN2023/086519 CN2023086519W WO2024207295A1 WO 2024207295 A1 WO2024207295 A1 WO 2024207295A1 CN 2023086519 W CN2023086519 W CN 2023086519W WO 2024207295 A1 WO2024207295 A1 WO 2024207295A1
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WIPO (PCT)
Prior art keywords
information
cell
downlink
adjacent candidate
reference signal
Prior art date
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PCT/CN2023/086519
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English (en)
Chinese (zh)
Inventor
孙刚
张健
贾美艺
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Fujitsu Ltd
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Fujitsu Ltd
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Publication date
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Priority to PCT/CN2023/086519 priority Critical patent/WO2024207295A1/fr
Publication of WO2024207295A1 publication Critical patent/WO2024207295A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the embodiments of the present application relate to the field of communication technologies.
  • Mobility management is an essential mechanism for cellular mobile communication systems, which can assist the new wireless NR system to achieve load balancing, provide users with a better experience and improve the overall performance of the system.
  • a terminal device moves from the coverage area of one cell to the coverage area of another cell, it is necessary to switch the serving cell of the terminal device.
  • the service cell switching of the terminal device is triggered by the measurement of layer 3, and the service cell is reconfigured through the radio resource control RRC signaling.
  • RRC signaling reconfigures the service cell
  • the operation of layer 1 and layer 2 of the communication system needs to be reset, which brings about a large system delay, signaling load and a long communication interruption time. Therefore, it is proposed to trigger through the measurement results of layer 1 and switch the service cell through layer 1/layer 2 signaling, which can effectively reduce the system delay, signaling load and communication interruption time.
  • the timing of switching the service cell of the terminal device is as follows: the network device sends the measurement and reporting configuration signaling of the adjacent candidate cells to the terminal device, the terminal device performs measurements according to the configuration signaling and reports the measurement results to the base station, the network device selects the target cell to be switched after obtaining the measurement results, and sends a switching instruction to the terminal device, after receiving the switching instruction, the terminal device starts to prepare for the switching, such as adjusting the RF frequency, resetting the baseband processing, etc.
  • the terminal device After the terminal device completes the corresponding switching preparation, it starts the process of downlink synchronization with the target cell, and then sends an uplink random access signal to start uplink synchronization, after receiving the random access signal, the network device sends a response signal to the terminal device, after receiving the response signal, the terminal device completes a switching process and starts to send and receive data in the new target cell. From the time the terminal device receives the switching instruction to the time the terminal device completes the switching process and sends and receives data in the new target cell During the period from when the data is received to when the terminal device is disconnected from the communication.
  • the time when the terminal device is in a communication interruption state includes the processing time for switching preparation after receiving a switching instruction, the time for downlink synchronization and the time for uplink synchronization, and the communication interruption time is relatively long.
  • an embodiment of the present application provides a method and device for sending and receiving information.
  • an information transceiver device which is applied to a network device, and the device includes:
  • a first sending unit which sends indication information of an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance to a terminal device;
  • a second sending unit is configured to send a cell switching command to the terminal device.
  • an information transceiver device which is applied to a terminal device, and the device includes:
  • a second receiving unit which receives indication information of an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance sent by a network device;
  • a third receiving unit is configured to receive a cell switching command sent by the network device.
  • an information transceiver device which is applied to a terminal device, and the device includes:
  • a first reporting unit configured to report a measurement result to a network device, wherein the measurement result includes a measurement result of one or more reference signals;
  • the second processing unit selects an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance according to the reported measurement result, and maintains downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam.
  • a communication system including a terminal device and/or a network device, wherein the terminal device includes the information transceiver device described in the aforementioned first aspect, and the network device includes the information transceiver device described in the aforementioned other aspect.
  • One of the beneficial effects of the embodiments of the present application is that before the network device sends a cell switching command to the terminal device, the terminal device maintains downlink synchronization with the adjacent candidate cell or the downlink beam of the adjacent candidate cell, thereby reducing the communication interruption time of the terminal device due to switching cells and reducing system delays.
  • FIG1 is a schematic diagram of a communication system of the present application.
  • FIG2 is a schematic diagram of a method for sending and receiving information according to an embodiment of the present application
  • FIG3 is a timing diagram of a cell switching according to an embodiment of the present application.
  • FIG4 is a schematic diagram of a method for sending and receiving information according to an embodiment of the present application.
  • FIG5 is a schematic diagram of a cell switching method according to an embodiment of the present application.
  • FIG6 is a schematic diagram of a method for sending and receiving information according to an embodiment of the present application.
  • FIG7 is a schematic diagram of a cell switching method according to an embodiment of the present application.
  • FIG8 is a schematic diagram of an information transceiver device according to an embodiment of the present application.
  • FIG9 is a schematic diagram of an information transceiver device according to an embodiment of the present application.
  • FIG10 is a schematic diagram of an information transceiver device according to an embodiment of the present application.
  • FIG11 is a schematic diagram of a network device according to an embodiment of the present application.
  • FIG12 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • FIG13 is a schematic diagram of a cell switching method according to an embodiment of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements in terms of title, but do not represent the spatial arrangement or time order of these elements, etc., and these elements should not be limited by these terms.
  • the term “and/or” includes any one and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having”, etc. refer to the existence of the stated features, elements, components or components, but do not exclude the existence or addition of one or more other features, elements, components or components.
  • the term “communication network” or “wireless communication network” may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), and the like.
  • LTE Long Term Evolution
  • LTE-A enhanced Long Term Evolution
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • communication between devices in the communication system may be carried out according to communication protocols of any stage, such as but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), future 6G, etc., and/or other communication protocols currently known or to be developed in the future.
  • 1G generation
  • 2G 2.5G
  • 2.75G 3G
  • 4G 4G
  • 4.5G and 5G 3G
  • NR New Radio
  • future 6G etc.
  • communication protocols currently known or to be developed in the future.
  • the term "network device” refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device.
  • the network device may include, but is not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.
  • base stations may include but are not limited to: NodeB (NodeB or NB), evolved NodeB (eNodeB or eNB) and 5G base station (gNB), etc., and may also include remote radio heads (RRH, Remote Radio Head), remote radio units (RRU, Remote Radio Unit), relays or low-power nodes (such as femeto, pico, etc.).
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relays or low-power nodes such as femeto, pico, etc.
  • base station may include some or all of their functions, and each base station may provide communication coverage for a specific geographical area.
  • the term "cell” may refer to a base station and/or its coverage area, It depends on the context in which the term is used.
  • the term "user equipment” (UE) or “terminal equipment” (TE) refers to, for example, a device that accesses a communication network through a network device and receives network services.
  • the terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and the like.
  • terminal devices may include but are not limited to the following devices: cellular phones, personal digital assistants (PDA, Personal Digital Assistant), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, cordless phones, smart phones, smart watches, digital cameras, etc.
  • PDA personal digital assistants
  • wireless modems wireless communication devices
  • handheld devices machine-type communication devices
  • laptop computers cordless phones
  • smart phones smart watches, digital cameras, etc.
  • the terminal device can also be a machine or device for monitoring or measuring, such as but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device to device (D2D) terminal, machine to machine (M2M) terminal, and so on.
  • MTC machine type communication
  • D2D device to device
  • M2M machine to machine
  • network side refers to one side of the network, which may be a base station, or may include one or more network devices as above.
  • user side or “terminal side” or “terminal device side” refers to one side of the user or terminal, which may be a UE, or may include one or more terminal devices as above.
  • device may refer to either a network device or a terminal device.
  • uplink control signal and “uplink control information (UCI)” or “physical uplink control channel (PUCCH)” are interchangeable, and the terms “uplink data signal” and “uplink data information” or “physical uplink shared channel (PUSCH)” are interchangeable if no confusion is caused;
  • downlink control signal and “downlink control information (DCI)” or “physical downlink control channel (PDCCH)” are interchangeable, and the terms “downlink data signal” and “downlink data information” or “physical downlink shared channel (PDSCH)” are interchangeable.
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • sending or receiving PUSCH can be understood as sending or receiving uplink data carried by PUSCH
  • sending or receiving PUCCH can be understood as sending or receiving uplink information carried by PUCCH
  • sending or receiving PRACH can be understood as sending or receiving preamble carried by PRACH
  • uplink signals may include uplink Data signals and/or uplink control signals, etc., may also be referred to as uplink transmission (UL transmission) or uplink information or uplink channels.
  • Sending uplink transmission on uplink resources may be understood as sending the uplink transmission using the uplink resources.
  • downlink data/signals/channels/information may be understood accordingly.
  • the high-level signaling may be, for example, a radio resource control (RRC) signaling; for example, an RRC message (RRC message), including, for example, MIB, system information (system information), a dedicated RRC message; or an RRC IE (RRC information element).
  • RRC radio resource control
  • the high-level signaling may also be, for example, a MAC (Medium Access Control) signaling; or a MAC CE (MAC control element).
  • RRC radio resource control
  • FIG1 is a schematic diagram of a communication system according to an embodiment of the present application, schematically illustrating a situation taking a terminal device and a network device as an example.
  • a communication system 100 may include a network device 101 and terminal devices 102 and 103.
  • FIG1 only illustrates two terminal devices and one network device as an example, but the embodiment of the present application is not limited thereto.
  • existing services or future services can be sent between the network device 101 and the terminal devices 102 and 103.
  • these services may include but are not limited to: enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable and low-latency communication
  • the terminal device 102 may send data to the network device 101, for example, using an authorized or unauthorized transmission mode.
  • the network device 101 may receive data sent by one or more terminal devices 102, and feedback information to the terminal device 102, such as confirmation ACK/non-confirmation NACK information, etc.
  • the terminal device 102 may confirm the end of the transmission process, or may perform new data transmission, or may retransmit the data according to the feedback information.
  • FIG1 shows that both terminal devices 102 and 103 are within the coverage of the network device 101, but the present application is not limited thereto. Both terminal devices 102 and 103 may not be within the coverage of the network device 101, or one terminal device 102 is within the coverage of the network device 101 and the other terminal device 103 is outside the coverage of the network device 101.
  • layer 1 includes the physical layer
  • layer 2 includes the radio link control RLC layer and the media access MAC layer
  • layer 3 includes the RRC layer.
  • a The servingAdditionalPCIList-r17 information field is associated with each reference signal in the reference signal set.
  • the measurement resource configuration of the synchronization signal block for layer 1 measurement can be expressed using ASN.I syntax as follows:
  • the servingAdditionalPCIList-r17 information field its content is the physical cell ID index of the adjacent candidate cell. When its value is 0, it indicates that the reference signal is the reference signal of the current serving cell. When it is not 0, the value is AdditionalPCIIndex-r17, indicating that the reference signal is the reference signal of the adjacent candidate cell.
  • the physical cell ID index value AdditionalPCIIndex-r17 of the neighboring candidate cell is configured in the SSB measurement timing configuration information element (SSB-MTC). It can be expressed using ASN.I syntax as follows:
  • the measurement timing configuration information element SSB-MTC for the adjacent candidate cell SSB includes an SSB-MTC-AdditionalPCI-r17 information field, including the physical cell ID index (AdditionalPCIIndex-r17), the physical cell ID, and measurement-related parameters such as the period of measuring SSB, the time domain position of SSB, and power.
  • SSB-MTC-AdditionalPCI-r17 information field including the physical cell ID index (AdditionalPCIIndex-r17), the physical cell ID, and measurement-related parameters such as the period of measuring SSB, the time domain position of SSB, and power.
  • the time that the terminal device is in a communication interruption state includes the processing time for switching preparation after receiving the switching instruction, the time for downlink synchronization and the time for uplink synchronization.
  • the communication interruption time is relatively long. Therefore, in the mobility management triggered by layer 1/layer 2, in order to reduce the communication interruption time, it is possible to consider completing the relevant processes of downlink synchronization before the network device sends the cell switching instruction.
  • the current standard does not support a method to advance the downlink synchronization to before the cell switching.
  • an embodiment of the present application provides a method and device for sending and receiving information, which are described below in conjunction with the accompanying drawings and embodiments.
  • An embodiment of the present application provides a method for sending and receiving information, which is described from the perspective of a network device.
  • FIG. 2 is a schematic diagram of a method for sending and receiving information according to an embodiment of the present application. As shown in FIG. 2 , the method includes:
  • the network device sends indication information of the neighboring candidate cell or the neighboring candidate cell downlink beam related to downlink synchronization maintenance to the terminal device;
  • the network device sends a cell switching command to the terminal device.
  • FIG2 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto.
  • the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG2.
  • the terminal device before the network device sends a cell switching command to the terminal device, the terminal device performs downlink synchronization maintenance with the adjacent candidate cell or the downlink beam of the adjacent candidate cell through the indication information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell related to downlink synchronization maintenance sent by the network device, thereby advancing the time for downlink synchronization to before receiving the cell switching command, reducing the terminal device caused by switching cells.
  • the communication interruption time caused by this function can be reduced, thus reducing the system delay.
  • the measurement of the neighboring candidate cell is used for layer 1/layer 2 triggered mobility management, or the layer 1 measurement of the neighboring candidate cell is used to support the layer 1/layer 2 switching of the neighboring candidate cell, that is, the switching of the serving cell is performed through layer 1/layer 2 signaling.
  • the following description is made by taking the measurement of the adjacent candidate cells for the mobility management triggered by layer 1/layer 2 as an example, but the embodiments of the present application are not limited to this.
  • the target cell below refers to the cell to be switched. It should be noted that in the following embodiments, the name of the information field, the data type and the value range are only for illustrative purposes, and the embodiments of the present application are not limited to this. The following examples are provided.
  • the downlink synchronization process is a process in which the terminal determines the frame boundary/frame header in the time domain of the downlink signal of a certain cell or the downlink beam of the cell from the received downlink signal.
  • Downlink synchronization maintenance or maintenance of downlink synchronization may refer to the process in which the terminal device maintains the downlink synchronization information of one or more adjacent candidate cells or one or more downlink beams of adjacent candidate cells in advance for the final downlink synchronization of the target cell or the downlink beam of the target cell.
  • the downlink synchronization information is the position information of the frame boundary/frame header in the time domain in the downlink signal received by the terminal device for the cell or the downlink beam of the cell.
  • the maintenance process includes acquiring and saving, updating and saving the downlink synchronization information of one or more adjacent candidate cells or one or more downlink beams of adjacent candidate cells.
  • the terminal device can use the downlink synchronization information to determine the position of the frame boundary/frame header in the time domain in the downlink signal of the target cell or the downlink beam of the target cell indicated in the cell switching command. Therefore, the object of downlink synchronization maintenance is the frame boundary/frame header position information in the time domain in the downlink signal of one or more adjacent candidate cells or the downlink beam of the adjacent candidate cell.
  • “maintain” can also be referred to as "keep” or "record”, which is not limited in the present embodiment. The specific process of the downlink synchronization information and the downlink synchronization information maintenance will be described later.
  • the adjacent candidate cells may be one or more candidate cells adjacent to the current serving cell of the terminal device, and the one or more adjacent candidate cells may be one or more cells among the cells measured by the terminal device, but the embodiments of the present application are not limited to this.
  • the downlink beam of an adjacent candidate cell may also be referred to as an adjacent candidate cell reference signal or a downlink beam corresponding to an adjacent candidate cell reference signal.
  • the adjacent candidate cell downlink beam may be one or more downlink beams (reference signals) in the downlink beam (reference signal) measured by the terminal device.
  • the embodiment of the present application does not limit this.
  • the reference signal includes SSB and CSI-RS. The following takes SSB as an example.
  • the downlink synchronization maintenance process of the terminal device can be advanced to before the cell switching command.
  • the object of downlink synchronization maintenance is the adjacent candidate cell or the downlink beam of the adjacent candidate cell.
  • Fig. 3 is a timing diagram of cell switching according to an embodiment of the present application.
  • the network device performs corresponding configuration for the measurement and reporting of adjacent candidate cells and sends it to the terminal device.
  • the terminal device performs measurement according to the received configuration and reports the measurement results to the network device.
  • the duration of this processing is called “measurement reporting time”, and the measurement reporting time is, for example, T1.
  • the terminal device also maintains the downlink synchronization of adjacent candidate cells or downlink beams of adjacent candidate cells, for example, maintains the downlink synchronization of one or more adjacent candidate cells or one or more downlink beams of adjacent candidate cells.
  • the duration of this processing is called “downlink synchronization (maintenance) time", and the downlink synchronization (maintenance) time is, for example, T2.
  • the network device sends a cell switching command to the terminal device, and the cell switching command, for example, includes the target cell or target cell.
  • the terminal device selects the downlink synchronization information corresponding to the target cell or the downlink beam of the target cell directly from the downlink synchronization information of the adjacent candidate cells or one or more downlink beams of the adjacent candidate cells maintained by it, and completes the downlink synchronization of the target cell or the downlink beam of the target cell. That is, the terminal device completes the downlink synchronization process of the target cell or the downlink beam of the target cell at the same time as receiving the cell switching command, and starts subsequent processing, such as the reception and transmission of new cell data, or uplink synchronization.
  • the terminal device sends a random access signaling to the network device
  • the network device sends a random access signaling response to the terminal device.
  • the downlink synchronization time T2 is reduced in the communication interruption time T3. Therefore, the communication interruption time caused by the cell switching can be reduced.
  • the uplink synchronization process that is, the duration T4 of the uplink synchronization, is after the cell switching command time t3, but the embodiment of the present application is not limited to this.
  • the uplink synchronization process can also be performed in advance before the network device sends the cell switching command, and the embodiment of the present application does not limit this.
  • the measurement reporting time T1 overlaps with the downlink synchronization (maintenance) time T2.
  • the terminal device can perform multiple measurements and reports, and after the first measurement and report, it starts the downlink synchronization maintenance.
  • the embodiments of the present application are not limited to this.
  • the measurement reporting time T1 and the downlink synchronization (maintenance) time T2 may not overlap, that is, after the terminal device completes the measurement report, the downlink synchronization maintenance is performed.
  • the embodiments of the present application do not limit this.
  • the following describes how to determine the adjacent candidate cells or adjacent candidate cell downlink beams that require downlink synchronization maintenance.
  • the network device may send an indication message to the terminal device to indicate
  • the neighboring candidate cell or the neighboring candidate cell downlink beam that needs to be maintained for downlink synchronization may be a newly designed information element or information field dedicated to indicating the neighboring candidate cell or the neighboring candidate cell downlink beam.
  • the indication information may reuse the existing information element or information field for other functions to indirectly determine the neighboring candidate cell or the neighboring candidate cell downlink beam.
  • the indication information may be carried by RRC signaling, MAC CE signaling, or DCI signaling.
  • the indication information may be a newly designed information element or information field, including one or more physical cell identification indexes, and the neighboring candidate cells corresponding to the one or more physical cell identification indexes need to perform downlink synchronization maintenance.
  • the network device sends neighboring candidate cell configuration information to the terminal device, the neighboring candidate cell configuration information includes information of neighboring candidate cells configured for neighboring candidate cell measurement, and the neighboring candidate cells corresponding to the one or more physical cell identification indexes are one or more of the neighboring candidate cells configured for neighboring candidate cell measurement.
  • the neighboring candidate cell measurement list configured by the network device for layer 1/layer 2 cell switching can be used to indicate the neighboring candidate cells that need to be maintained for downlink synchronization. That is, in the aforementioned example 2, the measurement timing configuration information element SSB-MTC for the neighboring candidate cell SSB contains an SSB-MTC-AdditionalPCI-r17 information field, which configures the information of the neighboring candidate cells for the neighboring candidate cell measurement, for example, including the physical cell ID index (AdditionalPCIIndex-r17), the physical cell ID, and the measurement-related parameters such as the period of measuring SSB, the time domain position of SSB, and power.
  • the measurement timing configuration information element SSB-MTC for the neighboring candidate cell SSB contains an SSB-MTC-AdditionalPCI-r17 information field, which configures the information of the neighboring candidate cells for the neighboring candidate cell measurement, for example, including the physical cell ID index (AdditionalPCIIndex-r17), the physical cell ID,
  • one or more neighboring candidate cells that need to be maintained for downlink synchronization can be indicated from the neighboring candidate cells indicated by AdditionalPCIIndex-r17, that is, the one or more physical cell identification indexes indicated by the indication information are one or more physical cell identification indexes of the neighboring candidate cells indicated by AdditionalPCIIndex-r17.
  • the PCI index of the adjacent candidate cell indicated by AdditionalPCIIndex-r17 is 1, 4, 7 (corresponding to 001, 100, 111 in binary), and the one or more physical cell identifier indexes included in the indication information of this application can be 4, 7 (100, 111).
  • the network device configures a list of adjacent candidate cells that need to be measured, including adjacent candidate cells 1, 4, and 7, and selects adjacent candidate cells 4 and 7 from them to indicate to the terminal device as adjacent candidate cells that need to perform downlink synchronization maintenance.
  • the terminal device can determine the (measured) downlink beam (reference signal) corresponding to the indicated adjacent candidate cell, and then perform downlink synchronization maintenance on the downlink beam of the adjacent candidate cell.
  • the indication information may be a newly designed information element or information field, including reference signal indication information, and one or more adjacent candidate cell downlink beams corresponding to the reference signal indication information need to be Downlink synchronization maintenance.
  • the network device sends reference signal configuration information to the terminal device, the reference signal configuration information includes information of a reference signal set configured for downlink beam measurement of an adjacent candidate cell, and the reference signal indicated by the reference signal indication information is a reference signal in the reference signal set.
  • the reference signal set configured by the network device for the measurement of the adjacent candidate cells can be used to indicate the downlink beam of the adjacent candidate cells that need to be maintained for downlink synchronization. That is, in the aforementioned example one, a servingAdditionalPCIList-r17 information field is included in the reference signal measurement resource configuration CSI-SSB-ResourceSet for layer 1 measurement, and the information field is associated with each reference signal in the reference signal set, that is, each configured reference signal is associated with the PCI index of the cell (correspondence relationship).
  • the indication information selects the reference signal that needs to be maintained for downlink synchronization from the configured reference signal set. According to the correspondence relationship, the adjacent candidate cell associated with the indicated reference signal can be determined, thereby determining the adjacent candidate cell reference signal (downlink beam) that needs to be maintained.
  • the reference signal indication information is a bitmap
  • the length of the bitmap is determined according to the number of reference signals in the reference signal set
  • the value of each bit is used to indicate whether the corresponding adjacent candidate cell downlink beam needs to perform downlink synchronization maintenance. For example, when the bit value is 0, it indicates that the adjacent candidate cell downlink beam corresponding to the reference signal does not need to perform downlink synchronization maintenance. When the bit value is 1, it indicates that the adjacent candidate cell downlink beam corresponding to the reference signal needs to perform downlink synchronization maintenance, and vice versa.
  • the reference signal indication information includes N bits, and the N bits correspond to reference signal #0, reference signal #1, ..., reference signal #N-1 in the reference signal set respectively.
  • N 8
  • the bitmap is 10001101
  • the adjacent candidate cell downlink beams corresponding to reference signals #0, #4, #5, and #7 (the index is a reference signal resource indication identifier) in the reference signal set need to perform downlink synchronization maintenance.
  • the embodiment of the present application is not limited to this.
  • N can also be 64.
  • the reference signal set may be an SSB reference signal set or a CSI-RS reference signal set, which is not limited in this embodiment of the present application.
  • the reference signal indication information includes resource indication identifiers (SSBRI/CRI: SSB/CSI-RS resource indicators, also referred to as reference signal resource indicators or reference signal resource indication information or reference signal resource indication) of one or more reference signals in the reference signal set
  • the resource indication identifier of the reference signal is the index of the reference signal in the reference signal set
  • the adjacent candidate cell downlink beams corresponding to the reference signals indexed 0, 4, 5, 7 in the reference signal set need to be maintained.
  • the embodiment of the present application is not limited to this, for example, N may also be 64.
  • the reference signal set may be an SSB reference signal set or a CSI-RS reference signal set, which is not limited in the embodiment of the present application.
  • the above indication information can be carried by RRC signaling, MAC CE signaling or DCI signaling, but the embodiments of the present application are not limited to this.
  • TCI state activation information may be used as indication information to indicate the neighboring candidate cell or the neighboring candidate cell downlink beam that needs to perform downlink synchronization maintenance.
  • the indication information includes TCI state activation information. If TCI state activation information is received before the cell switching command, the TCI state activation information may be used as the indication information to determine the neighboring candidate cell or the neighboring candidate cell downlink beam that needs to perform downlink synchronization maintenance.
  • TCI state activation information can be carried by MAC CE, and one or more reference signals in the source reference signal indicated by the TCI state activated by the TCI state activation information correspond to the adjacent candidate cell or the adjacent candidate cell downlink beam, which needs to be maintained for downlink synchronization.
  • the network device activates the TCI state through MAC CE, for example, MAC CE includes an information field of A bits, A is equal to the number of TCI states in the TCI state list, each bit corresponds to a TCI state, when the bit value is 1, the corresponding TCI state is indicated (activated), when the bit value is 0, the corresponding TCI state is not indicated (not activated), according to the activated TCI state, the corresponding source reference signal can be determined, and the terminal device can select one or more reference signals (downlink beams) in the source reference signal for downlink synchronization maintenance, for example, select one or more reference signals with the largest reference signal measurement result for maintenance, or select all source reference signals for downlink synchronization maintenance, for details, please refer to the embodiment of the second aspect.
  • A is equal to the number of TCI states in the TCI state list
  • each bit corresponds to a TCI state, when the bit value is 1, the corresponding TCI state is indicated (activated), when the bit value is 0, the corresponding TCI state is not indicated (
  • the MAC CE includes an information field of B bits, where the B bits are used to represent the ID of the activated TCI state.
  • the activated TCI state can be determined according to the value of the B bits to determine the corresponding source reference signal.
  • the terminal device can select one or more reference signals (downlink beams) from the source reference signal for downlink synchronization maintenance, such as selecting one or more reference signals with the largest reference signal measurement results for maintenance, or selecting all source reference signals for downlink synchronization maintenance. Examples are not given one by one here.
  • the indication information includes configuration information and TCI state activation information, wherein the configuration information includes the aforementioned one or more physical cell identifier indexes, or the aforementioned reference signal indication information, and one or more adjacent candidate cells or adjacent candidate cell downlink beams indicated by the configuration information and/or the TCI state activation information need to perform downlink synchronization maintenance.
  • the source reference signal of the TCI state indicated by the TCI state activation information or the adjacent candidate cell corresponding to the source reference signal is included or not included in the configuration information indication. or the reference signal or the neighboring candidate cell indicated by the configuration information includes or does not include the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal.
  • the network device first sends the aforementioned reference signal indication information to the terminal device, and then sends the TCI state activation information to the terminal device.
  • the source reference signal of the TCI state activated by the TCI state activation information is included in the reference signal indicated by the reference signal indication information (the terminal device expects the source reference signal of the TCI state activated by the TCI state activation information to be one or more of the reference signals indicated by the network device for the configuration information), that is, the adjacent candidate cell downlink beam corresponding to the source reference signal of the TCI state activated by the TCI state activation information is one or more of the adjacent candidate cell downlink beams that need to be maintained for downlink synchronization configured by the configuration information.
  • the behavior on the terminal device side will be described in the embodiment of the second aspect described later.
  • the above is only an example description, but the embodiments of the present application are not limited to this.
  • the source reference signal of the TCI state indicated by the TCI state activation information may not be included in the reference signal indicated by the configuration information.
  • the behavior on the terminal device side is different from the aforementioned embodiment, which will be specifically described in the embodiment of the second aspect.
  • the network device first sends the aforementioned one or more physical cell identification indexes to the terminal device, and then sends TCI state activation information to the terminal device.
  • the adjacent candidate cell corresponding to the source reference signal of the TCI state activated by the TCI state activation information is included in the adjacent candidate cells indicated by the one or more physical cell identification indexes (the terminal device expects that the adjacent candidate cell corresponding to the source reference signal of the TCI state activated by the TCI state activation information is one or more of the adjacent candidate cells indicated by the network device for the configuration information), that is, the adjacent candidate cell corresponding to the source reference signal of the TCI state activated by the TCI state activation information is one or more of the adjacent candidate cells that need to be downlink synchronized and maintained as configured by the configuration information.
  • the behavior on the terminal device side will be described in the second embodiment described later.
  • the above is only an example description, but the embodiments of the present application are not limited to this.
  • the adjacent candidate cell corresponding to the source reference signal of the TCI state indicated by the TCI state activation information may not be included in the adjacent candidate cell indicated by the configuration information.
  • the behavior on the terminal device side is different from the aforementioned embodiment, which will be specifically described in the embodiment of the second aspect.
  • the network device first sends TCI state activation information to the terminal device, and then sends one or more physical cell identification indexes to the terminal device.
  • the adjacent candidate cells indicated by the one or more physical cell identification indexes are included in the adjacent candidate cells corresponding to the source reference signal of the TCI state activated by the TCI state activation information (the terminal device expects that the adjacent candidate cells indicated by the configuration information are one or more of the adjacent candidate cells corresponding to the source reference signal of the TCI state activated by the TCI state activation information).
  • the behavior will be described in the embodiment of the second aspect described later. The above is only an example, but the embodiments of the present application are not limited to this.
  • the adjacent candidate cell indicated by the configuration information may not be included in the adjacent candidate cell corresponding to the source reference signal of the TCI state indication activated by the TCI state activation information.
  • the behavior on the terminal device side is different from the aforementioned embodiment, which will be specifically described in the embodiment of the second aspect.
  • the network device first sends TCI state activation information to the terminal device, and then sends reference signal indication information to the terminal device.
  • the reference signal indicated by the reference signal indication information is included in the source reference signal of the TCI state activated by the TCI state activation information (the terminal device expects that the reference signal indicated by the configuration information is one or more of the source reference signals of the TCI state activated by the TCI state activation information).
  • the behavior on the terminal device side will be described in the embodiment of the second aspect described later. The above is only an example description, but the embodiments of the present application are not limited to this.
  • the reference signal indicated by the configuration information may not be included in the source reference signal of the TCI state indication activated by the TCI state activation information. At this time, the behavior on the terminal device side is different from the aforementioned embodiment, which will be specifically described in the embodiment of the second aspect.
  • the network device selects one or more (with better measurement results or randomly selected) or all adjacent candidate cells or adjacent candidate cell downlink beams and indicates them to the terminal device through the indication information, but the embodiments of the present application are not limited to this.
  • the network device receives the measurement result sent by the terminal device; and, after receiving the measurement result, sends the indication information.
  • the network device sends the configuration information of the measurement and reporting of the adjacent candidate cell or the adjacent candidate cell downlink beam to the terminal device, receives the measurement result of the adjacent candidate cell or the adjacent candidate cell downlink beam sent by the terminal device, and configures/indicates the indication information of the adjacent candidate cell or the adjacent candidate cell downlink beam that needs to be maintained for downlink synchronization for the terminal device according to the measurement result, for example, configures/indicates one or more adjacent candidate cells or adjacent candidate cell downlink beams with better measurement results as the adjacent candidate cell or adjacent candidate cell downlink beam that needs to be maintained for downlink synchronization, and sends the indication information to the terminal device, but the embodiment of the present application is not limited to this, the indication information can also be sent after sending the configuration information of the measurement and reporting of the adjacent candidate cell or the adjacent candidate cell downlink beam, or the indication information is carried in the configuration information, etc
  • the cell switching command includes a target cell or a target cell downlink wave.
  • the target cell or the target cell downlink beam is one of the adjacent candidate cells or the adjacent candidate cell downlink beams indicated by the indication information. That is, the terminal device expects that the target cell or the target cell downlink beam indicated in the cell switching command is one of the adjacent candidate cells or the adjacent candidate cell downlink beams for which it performs downlink synchronization maintenance.
  • the terminal device after receiving the cell switching command, the terminal device directly selects the downlink synchronization information corresponding to the target cell or the target cell downlink beam from the downlink synchronization information of one or more downlink beams of the maintained adjacent candidate cells or adjacent candidate cells, and completes the downlink synchronization of the target cell or the target cell downlink beam. That is, the terminal device completes the downlink synchronization process of the target cell or the target cell downlink beam at the same time as receiving the cell switching command.
  • the terminal device before the network device sends a cell switching command to the terminal device, the terminal device maintains the downlink synchronization with the adjacent candidate cell or the downlink beam of the adjacent candidate cell through the indication information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell related to the downlink synchronization maintenance sent by the network device.
  • the time for performing downlink synchronization is advanced to before receiving the cell switching command, thereby reducing the communication interruption time of the terminal device caused by switching cells and reducing system delays.
  • An embodiment of the present application provides a method for sending and receiving information, which is described from the terminal device side, and the contents that are the same as the embodiment of the first aspect are not repeated.
  • FIG4 is a schematic diagram of a method for sending and receiving information according to an embodiment of the present application. As shown in FIG4 , the method includes:
  • the terminal device receives indication information of an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance sent by a network device;
  • the terminal device receives a cell switching command sent by the network device.
  • FIG. 4 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto.
  • the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 4.
  • the implementation of 401-402 corresponds to 201-202.
  • the terminal device receives indication information of a neighboring candidate cell or a neighboring candidate cell downlink beam related to downlink synchronization maintenance sent by a network device, and maintains the downlink synchronization maintenance according to the indication information.
  • the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell For example, the terminal device obtains and saves the downlink synchronization information, and updates and saves the downlink synchronization information.
  • the terminal device obtains the downlink synchronization information including: performing downlink synchronization on the adjacent candidate cell or the adjacent candidate cell downlink beam to obtain the downlink synchronization information, or obtaining the downlink synchronization information from the downlink synchronization process when measuring the signal quality of the adjacent candidate cell or the candidate cell downlink beam.
  • maintaining downlink synchronization includes: the terminal device re-performs the synchronization process of the adjacent candidate cell downlink beam once or more times to obtain and save the downlink synchronization information, and performs the downlink synchronization process again to update the downlink synchronization information, or the terminal device can obtain and save the downlink synchronization information from the downlink synchronization process performed when measuring the signal quality of the downlink beam of the adjacent candidate cell in history, and performs downlink synchronization again based on the historical information to update the downlink synchronization information.
  • the process of performing downlink synchronization includes the terminal device detecting the position of the adjacent candidate cell downlink beam (corresponding reference signal) in the time domain, determining the frame boundary/frame header position, and using the frame boundary/frame header position as the downlink synchronization information.
  • the maintenance of downlink synchronization is completed by obtaining, saving and updating the downlink synchronization information.
  • the indication information includes one or more physical cell identity indexes, and the neighboring candidate cells corresponding to the one or more physical cell identity indexes need to perform downlink synchronization maintenance.
  • the terminal device determines the adjacent candidate cell that needs to be maintained according to the indicated one or more physical cell identification indexes, and selects one or more downlink beams of the adjacent candidate cell from the reference signal (downlink beam) of the adjacent candidate cell that it has measured according to its implementation algorithm for downlink synchronization maintenance, but the embodiments of the present application are not limited to this.
  • a beam with the best signal quality such as L1-RSRP or L1-SINR
  • the maintenance method is as described above and will not be repeated here.
  • the indication information includes reference signal indication information, and one or more adjacent candidate cell downlink beams corresponding to the reference signal indication information need to perform downlink synchronization maintenance.
  • the terminal device determines the downlink beam (corresponding to the reference signal) that needs to be maintained and the associated adjacent candidate cells based on the indicated reference signal, and performs downlink synchronization maintenance on this part of the downlink beam.
  • the maintenance method is as described above and will not be repeated here.
  • the indication information includes TCI state activation information, and the adjacent candidate cells or adjacent candidate cell downlink beams corresponding to one or more reference signals in the source reference signal of the TCI state indication activated by the TCI state activation information need to perform downlink synchronization maintenance.
  • the terminal device can maintain the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell according to the information of the reference signal. That is, the terminal device performs downlink synchronization maintenance on the adjacent candidate cell or the downlink beam of the adjacent candidate cell corresponding to one or more reference signals in the source reference signal indicated by the TCI state activated by the TCI state activation information.
  • the terminal device can maintain the downlink synchronization information corresponding to one or more reference signals in the source reference signal.
  • the downlink synchronization information corresponding to one or more reference signals with the best measured reference signal quality (L1-RSRP or L1-SINR) is selected for maintenance.
  • L1-RSRP or L1-SINR the best measured reference signal quality
  • the embodiments of the present application are not limited to this.
  • the downlink synchronization information corresponding to all reference signals in the source reference signal can also be maintained.
  • the maintenance method is as described above and will not be repeated here.
  • the indication information includes configuration information and TCI state activation information, wherein the configuration information includes the aforementioned one or more physical cell identifier indexes, or the aforementioned reference signal indication information, and one or more adjacent candidate cells or adjacent candidate cell downlink beams indicated by the configuration information and/or the TCI state activation information need to perform downlink synchronization maintenance.
  • the source reference signal of the TCI state indication activated by the TCI state activation information or the adjacent candidate cell corresponding to the source reference signal is included or not included in the reference signal or the adjacent candidate cell indicated by the configuration information; or the reference signal or the adjacent candidate cell indicated by the configuration information is included or not included in the source reference signal of the TCI state indication activated by the TCI state activation information or the adjacent candidate cell corresponding to the source reference signal.
  • the terminal device when the terminal device receives the configuration information, it performs downlink synchronization maintenance according to one or more adjacent candidate cells or adjacent candidate cell downlink beams indicated by the configuration information (obtaining a downlink synchronization maintenance list, including one or more downlink synchronization information); when the TCI state activation information is received after receiving the configuration information, the adjacent candidate cells or adjacent candidate cell downlink beams that need to perform downlink synchronization maintenance are updated according to the TCI state activation information.
  • the step of updating the adjacent candidate cell or the adjacent candidate cell downlink beam that needs to be maintained for downlink synchronization includes: the terminal device re-synchronizes the adjacent candidate cell or the adjacent candidate cell downlink beam corresponding to the source reference signal activated by the TCI state activation information, and adds it to the downlink synchronization maintenance list (for example, the adjacent candidate cell downlink synchronization maintenance list or the adjacent candidate cell downlink beam downlink synchronization maintenance list).
  • the downlink synchronization maintenance list for example, the adjacent candidate cell downlink synchronization maintenance list or the adjacent candidate cell downlink beam downlink synchronization maintenance list.
  • the terminal device also The downlink synchronization maintenance list may be updated to retain only the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell corresponding to the source reference signal.
  • the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell that is not corresponding to the source reference signal is no longer maintained, and only the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell corresponding to the source reference signal is maintained.
  • the step of updating the adjacent candidate cell or the adjacent candidate cell downlink beam that needs to be maintained for downlink synchronization includes: the terminal device updates the downlink synchronization maintenance list, deletes the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam that is not corresponding to the source reference signal, and only retains the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam that is corresponding to the source reference signal.
  • the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam that is not corresponding to the source reference signal is no longer maintained, and only the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam that is corresponding to the source reference signal is maintained.
  • the terminal device when the terminal device receives the TCI state activation information, it performs downlink synchronization maintenance on one or more adjacent candidate cells or adjacent candidate cell downlink beams corresponding to the reference signal activated by the TCI state activation information (obtaining a downlink synchronization maintenance list, including one or more downlink synchronization information); when the configuration information is received after receiving the TCI state activation information, the adjacent candidate cells or adjacent candidate cell downlink beams that need to perform downlink synchronization maintenance are updated according to the configuration information.
  • the step of updating the adjacent candidate cell or the adjacent candidate cell downlink beam that needs to perform downlink synchronization maintenance includes: the terminal device re-downlink synchronizes the adjacent candidate cell indicated by the configuration information or the adjacent candidate cell downlink beam, and adds it to the downlink synchronization maintenance list (for example, the adjacent candidate cell downlink synchronization maintenance list or the adjacent candidate cell downlink beam downlink synchronization maintenance list).
  • the terminal device can also update the downlink synchronization maintenance list, and only retain the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam indicated by the configuration information.
  • the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam that is not indicated by the configuration information is no longer maintained, and only the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam indicated by the configuration information is maintained.
  • the step of updating the adjacent candidate cells or the downlink beams of the adjacent candidate cells that need downlink synchronization maintenance includes: the terminal device updates the downlink synchronization maintenance list, deletes the downlink synchronization information of the adjacent candidate cells or the downlink beams of the adjacent candidate cells that are not indicated by the configuration information, and only retains the downlink synchronization information of the adjacent candidate cells or the downlink beams of the adjacent candidate cells indicated by the configuration information.
  • the downlink synchronization information of the adjacent candidate cells or the downlink beams of the adjacent candidate cells that are not indicated by the configuration information is no longer maintained, and only the downlink synchronization information of the adjacent candidate cells or the downlink beams of the adjacent candidate cells indicated by the configuration information is maintained.
  • the terminal device upon receiving the indication information, the terminal device starts to maintain the downlink synchronization information until the terminal device receives the cell switching command.
  • the cell switching command includes relevant information of the target cell or the target cell downlink beam
  • the terminal device expects that the target cell or the target cell downlink beam is one of the adjacent candidate cells or adjacent candidate cell downlink beams indicated by the indication information. Therefore, the terminal device receives the cell switching command sent by the network device, after which the terminal device selects the downlink synchronization information of the target cell or the target cell downlink beam from the downlink synchronization information it maintains, completes the downlink synchronization of the target cell or the target cell downlink beam, performs subsequent processing (as shown in Figure 3 above), and resets the downlink synchronization information it maintains.
  • the terminal device before receiving the cell switching command from the network device, the terminal device receives the indication information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell related to the downlink synchronization maintenance, and maintains the downlink synchronization with the adjacent candidate cell or the downlink beam of the adjacent candidate cell.
  • the time for performing the downlink synchronization is advanced to before receiving the cell switching command, thereby reducing the communication interruption time of the terminal device caused by switching cells and reducing the system delay.
  • FIG5 is a schematic diagram of the cell switching method triggered by layer 1/layer 2 in the embodiment of the present application. As shown in FIG5, the method includes:
  • the network device sends a neighboring candidate cell measurement report configuration signaling to the terminal device;
  • the terminal device performs measurement and reports the measurement result
  • the network device sends instruction information to the terminal device
  • the terminal device performs downlink synchronization maintenance
  • the network device sends a cell switching command to the terminal device
  • the terminal device selects the downlink synchronization information of the target cell or the downlink beam of the target cell, and completes the downlink synchronization of the target cell or the downlink beam of the target cell;
  • the terminal device sends a random entry signaling to the network device
  • the network device sends a random access signaling response to the terminal device to complete the cell switching.
  • FIG. 5 also includes a step not shown: the terminal device resets the downlink synchronization information it maintains.
  • FIG. 13 is a schematic diagram of a cell switching method triggered by layer 1/layer 2 according to an embodiment of the present application. As shown in FIG. 13 , the method includes:
  • the network device sends a neighboring candidate cell measurement report configuration signaling to the terminal device;
  • the terminal device performs measurement and reports the measurement result
  • the network device sends configuration information to the terminal device
  • the terminal device performs downlink synchronization maintenance according to the configuration information
  • the network device sends TCI status activation information to the terminal device;
  • the terminal device updates the downlink synchronization maintenance according to the TCI status activation information
  • the network device sends a cell switching command to the terminal device
  • the terminal device selects the downlink synchronization information of the target cell or the downlink beam of the target cell, and completes the downlink synchronization of the target cell or the downlink beam of the target cell;
  • the terminal device sends a random entry signaling to the network device
  • the network device sends a random access signaling response to the terminal device to complete the cell switching.
  • FIG. 13 also includes a step not shown: the terminal device resets the downlink synchronization information it maintains.
  • terminal configuration information in 1303-1304 can be replaced with TCI state activation information
  • the TCI state activation information in 1305-1306 can be replaced with configuration information, which will not be illustrated one by one here.
  • the embodiment of the present application provides a method for sending and receiving information, which is described from the perspective of a terminal device.
  • the difference between the embodiments is that the network device does not send indication information of adjacent candidate cells or adjacent candidate cell downlink beams related to downlink synchronization maintenance to the terminal device (including not configuring the adjacent candidate cell or adjacent candidate cell downlink beam, or not activating the TCI state before sending the cell switching command), and the terminal device determines which adjacent candidate cells or adjacent candidate cell downlink beams need to maintain downlink synchronization information, and the repetitions with the previous embodiments are not repeated here.
  • FIG6 is a schematic diagram of a method for sending and receiving information according to an embodiment of the present application. As shown in FIG6 , the method includes:
  • the terminal device reports a measurement result to a network device, where the measurement result includes measurement results of one or more reference signals;
  • the terminal device selects an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance according to the reported measurement result, and maintains downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam.
  • FIG. 6 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto.
  • the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 6.
  • the terminal device may maintain downlink synchronization information of an adjacent candidate cell or a downlink beam of an adjacent candidate cell based on the measurement results reported to the network device.
  • the terminal device selects one or more neighboring candidate cells or neighboring candidate cell downlink beams corresponding to the reference signals according to the measurement results of the reference signals reported to the network device to maintain the downlink synchronization information.
  • the downlink synchronization information of the reference signal (corresponding neighboring candidate cell downlink beam) corresponding to one or more results with the best quality (L1-RSRP or L1-SINR) in the reported measurement results is selected for maintenance.
  • the embodiments of the present application are not limited to this.
  • the downlink synchronization information of all reference signals (corresponding neighboring candidate cell downlink beams) of the reported measurement results can also be maintained.
  • the terminal device when the terminal device reports measurement results to the network device multiple times, the terminal device selects an adjacent candidate cell or an adjacent candidate cell downlink beam that needs to be maintained for downlink synchronization from the most recently reported measurement results, but the embodiments of the present application are not limited to this.
  • the terminal device can also make a selection based on the measurement results reported multiple times. For example, from the measurement results reported multiple times, select the reference signal corresponding to the best one or more measurement results, and maintain the downlink synchronization information of the reference signal (corresponding to the adjacent candidate cell downlink beam).
  • the embodiments of the present application do not limit the specific selection method. For example, it is determined by the implementation algorithm of the terminal device. Determine the corresponding selection method.
  • the terminal device after the terminal device reports the measurement results to the network device for the first time, the terminal device begins to maintain the downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam until the terminal device receives the cell switching command, and the terminal device selects the downlink synchronization information of the target cell or the target cell downlink beam from the downlink synchronization information it maintains, completes the downlink synchronization of the target cell or the target cell downlink beam, performs subsequent processing (as shown in Figure 3 above), and resets the downlink synchronization information it maintains.
  • the terminal device maintains the downlink synchronization information of the selected adjacent candidate cell or the downlink beam of the adjacent candidate cell.
  • the specific maintenance method can refer to the embodiment of the second aspect, which will not be repeated here.
  • the method may further include:
  • the terminal device receives a cell switching command sent by the network device, where the cell switching command includes relevant information of a target cell or a target cell downlink beam, and the target cell or the target cell downlink beam is one of the adjacent candidate cells or adjacent candidate cell downlink beams of the downlink synchronization information maintained by the terminal device.
  • the terminal device receives a cell switching command sent by a network device, and the terminal device expects that the target cell or the downlink beam of the target cell indicated in the cell switching command is one of the adjacent candidate cells or the downlink beams of the adjacent candidate cells for which the terminal device maintains downlink synchronization information.
  • the network device receives the measurement result reported by the terminal device, and the network device sends a cell switching command to the terminal device.
  • the embodiment of the present application does not limit the processing method on the network device side. For the specific content on the network device side, reference can be made to the relevant technology.
  • the terminal device before receiving a cell switching command from a network device, the terminal device selects an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance according to the reported measurement results and maintains the corresponding downlink synchronization information, and maintains downlink synchronization with the adjacent candidate cell or the adjacent candidate cell downlink beam.
  • the time for performing downlink synchronization is advanced to before receiving the cell switching command, thereby reducing the communication interruption time of the terminal device caused by switching cells and reducing system delays.
  • FIG. 7 is a schematic diagram of a cell switching method triggered by layer 1/layer 2 in an embodiment of the present application. As shown in FIG. 7 , the method includes:
  • the network device sends a neighboring candidate cell measurement report configuration signaling to the terminal device;
  • the terminal device reports the measurement result to the network device
  • the terminal device selects an adjacent candidate cell or an adjacent candidate cell downlink beam according to the measurement result and maintains downlink synchronization information;
  • the network device sends a cell switching command to the terminal device
  • the terminal device selects the downlink synchronization information of the target cell or the downlink beam of the target cell, and completes the downlink synchronization of the target cell or the downlink beam of the target cell;
  • the terminal device sends a random entry signaling to the network device
  • the network device sends a random access signaling response to the terminal device to complete the cell switching.
  • FIG. 7 also includes a step not shown: the terminal device resets the downlink synchronization information it maintains.
  • FIG. 7 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto.
  • the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG. 7.
  • the embodiment of the present application provides an information transceiver device.
  • the device may be, for example, a network device, or may be one or more components or assemblies configured in the network device, and the same contents as those in the embodiment of the first aspect will not be repeated.
  • FIG8 is a schematic diagram of an information transceiver device according to an embodiment of the present application. As shown in FIG8 , the information transceiver device 800 includes:
  • a first sending unit 801 which sends indication information of a neighboring candidate cell or a downlink beam of a neighboring candidate cell related to downlink synchronization maintenance to a terminal device;
  • the second sending unit 802 sends a cell switching command to the terminal device.
  • the information transceiver device 800 may also include other components or modules, and the specific contents of these components or modules may refer to the relevant technologies.
  • FIG8 only exemplifies the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned various components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.
  • the embodiment of the present application provides an information transceiver device.
  • the device may be, for example, a terminal device, or may be one or more components or assemblies configured in the terminal device, and the same contents as those in the embodiment of the first aspect will not be repeated.
  • FIG9 is a schematic diagram of an information transceiver device according to an embodiment of the present application. As shown in FIG9 , the information transceiver device 900 includes:
  • a second receiving unit 901 which receives indication information of a neighboring candidate cell or a downlink beam of a neighboring candidate cell related to downlink synchronization maintenance sent by a network device;
  • the third receiving unit 902 is configured to receive a cell switching command sent by the network device.
  • the embodiment of the present application provides an information transceiver device.
  • the device may be, for example, a terminal device, or may be one or more components or assemblies configured in the terminal device, and the contents that are the same as those in the embodiment of the third aspect will not be repeated.
  • FIG10 is a schematic diagram of an information transceiver device according to an embodiment of the present application. As shown in FIG10 , the information transceiver device 1000 includes:
  • a first reporting unit 1001 which reports a measurement result to a network device, where the measurement result includes measurement results of one or more reference signals;
  • the second processing unit 1002 selects a neighboring candidate cell or a neighboring candidate cell downlink beam related to downlink synchronization maintenance according to the reported measurement result, and maintains downlink synchronization information of the neighboring candidate cell or the neighboring candidate cell downlink beam.
  • the information transceiver devices 900 and 1000 may also include other components or modules, and the specific contents of these components or modules may refer to the relevant technology.
  • FIG9 and FIG10 only exemplarily illustrate the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned various components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.
  • An embodiment of the present application also provides a communication system, and reference may be made to FIG1 .
  • the contents that are the same as those of the first to fifth embodiments will not be repeated herein.
  • the communication system 100 may include at least: a network device 101 and/or a terminal device 102, wherein the network device 101 includes the information transceiving device 900 in the embodiment of the fourth aspect, and the terminal device 102 includes the information transceiving device 900 or 1000 in the embodiment of the fifth aspect, which will not be repeated here.
  • An embodiment of the present application further provides a network device, which may be, for example, a base station, but the present application is not limited thereto and may also be other network devices.
  • a network device which may be, for example, a base station, but the present application is not limited thereto and may also be other network devices.
  • FIG11 is a schematic diagram of the composition of a network device according to an embodiment of the present application.
  • the network device 1100 may include: a processor 1110 (e.g., a central processing unit CPU) and a memory 1120; the memory 1120 is coupled to the processor 1110.
  • the memory 1120 may store various data; in addition, it may store a program 1130 for information processing, and the program 1130 may be executed under the control of the processor 1110.
  • the processor 1110 may be configured to execute a program to implement the information sending and receiving method as described in the embodiment of the first aspect.
  • the network device 1100 may further include: a transceiver 1140 and an antenna 1150, etc.; wherein the functions of the above components are similar to those of the prior art and are not described in detail here. It is worth noting that the network device 1100 does not necessarily include all the components shown in FIG11 ; in addition, the network device 1100 may also include components not shown in FIG11 , which may refer to the prior art.
  • the embodiment of the present application also provides a terminal device, but the present application is not limited thereto and may also be other devices.
  • FIG12 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • the terminal device 1200 may include a processor 1210 and a memory 1220; the memory 1220 stores data and programs and is coupled to the processor 1210.
  • Device 1210. It should be noted that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.
  • the processor 1210 may be configured to execute a program to implement the information sending and receiving method as described in the embodiments of the second or third aspect.
  • the terminal device 1200 may further include: a communication module 1230, an input device 1240, a display 1250, and a power supply 1260.
  • the functions of the above components are similar to those in the prior art and are not described in detail here. It is worth noting that the terminal device 1200 does not necessarily include all the components shown in FIG12 , and the above components are not necessary; in addition, the terminal device 1200 may also include components not shown in FIG12 , and reference may be made to the prior art.
  • An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program enables the terminal device to execute the information sending and receiving method described in the embodiment of the second or third aspect.
  • An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the information sending and receiving method described in the embodiment of the second or third aspect.
  • An embodiment of the present application also provides a computer program, wherein when the program is executed in a network device, the program enables the network device to execute the information sending and receiving method described in the embodiment of the first aspect.
  • An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a network device to execute the information sending and receiving method described in the embodiment of the first aspect.
  • the above devices and methods of the present application can be implemented by hardware, or by hardware combined with software.
  • the present application relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above-mentioned devices or components, or enables the logic component to implement the various methods or steps described above.
  • the present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.
  • the method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams shown in the figure and/or one or more combinations of the functional block diagrams may correspond to various software modules of the computer program flow or to various hardware modules.
  • These software modules may correspond to the various steps shown in the figure, respectively.
  • These hardware modules may be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).
  • FPGA field programmable gate array
  • the software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor so that the processor can read information from the storage medium. information, and can write information to the storage medium; or the storage medium can be a component of the processor.
  • the processor and the storage medium can be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or the large-capacity flash memory device.
  • the functional blocks described in the drawings and/or one or more combinations of functional blocks it can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present application.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • it can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.
  • a method for sending and receiving information, applied to a network device comprising:
  • the network device sends indication information of an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance to the terminal device;
  • the network device sends a cell switching command to the terminal device.
  • the indication information includes one or more physical cell identification indexes
  • the adjacent candidate cells corresponding to the one or more physical cell identification indexes need to perform downlink synchronization maintenance.
  • the network device sends neighboring candidate cell configuration information to the terminal device, wherein the neighboring candidate cell configuration information includes information of neighboring candidate cells configured for neighboring candidate cell measurement, and the neighboring candidate cells corresponding to the one or more physical cell identification indexes are one or more of the neighboring candidate cells configured for neighboring candidate cell measurement.
  • the indication information includes reference signal indication information
  • one or more adjacent candidate cell downlink beams corresponding to the reference signal indication information need to perform downlink synchronization maintenance.
  • the network device sends reference signal configuration information to the terminal device, the reference signal configuration information includes information of a reference signal set configured for downlink beam measurement of an adjacent candidate cell, and the reference signal indicated by the reference signal indication information is a reference signal in the reference signal set.
  • the reference signal indication information is a bit map
  • the length of the bit map is determined according to the number of reference signals in the reference signal set, and the value of each bit is used to indicate whether the corresponding adjacent candidate cell downlink beam needs to perform downlink synchronization maintenance.
  • the reference signal indication information includes a resource indication identifier of one or more reference signals in the reference signal set
  • the resource indication identifier of the reference signal is the index of the reference signal in the reference signal set
  • one or more adjacent candidate cell downlink beams corresponding to the one or more reference signals need to perform downlink synchronization maintenance.
  • the indication information includes TCI state activation information, and the adjacent candidate cells or adjacent candidate cell downlink beams corresponding to one or more reference signals in the source reference signal of the TCI state indication activated by the TCI state activation information need to perform downlink synchronization maintenance.
  • the indication information includes configuration information and TCI state activation information
  • the configuration information includes one or more physical cell identifier indexes, or reference signal indication information
  • one or more adjacent candidate cells or adjacent candidate cell downlink beams indicated by the configuration information and/or the TCI state activation information need to perform downlink synchronization maintenance.
  • the source reference signal of the TCI state indicated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal is included in the reference signal or the neighboring candidate cell indicated by the configuration information; or,
  • the reference signal or the neighboring candidate cell indicated by the configuration information is included in the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal.
  • the source reference signal indicated by the TCI state activated by the TCI state activation information or the adjacent candidate cell corresponding to the source reference signal is not included in the reference signal or the adjacent candidate cell indicated by the configuration information; or,
  • the reference signal or the neighboring candidate cell indicated by the configuration information is not included in the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal.
  • the cell switching command includes relevant information of a target cell or a target cell downlink beam
  • the target cell or the target cell downlink beam is one of the adjacent candidate cells or adjacent candidate cell downlink beams indicated by the indication information.
  • the network device receives the measurement result sent by the terminal device; and sends the indication information after receiving the measurement result.
  • the measurement results are used for layer 1/layer 2 triggered mobility management.
  • a method for sending and receiving information, applied to a terminal device characterized in that the method comprises:
  • the terminal device receives indication information of an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance sent by a network device;
  • the terminal device receives a cell switching command sent by the network device.
  • the cell switching command includes relevant information of the target cell or the target cell downlink beam
  • the target cell or the target cell downlink beam is one of the adjacent candidate cells or the adjacent candidate cell downlink beams indicated by the indication information.
  • the terminal device maintains the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell according to the indication information.
  • the terminal device obtains and saves the downlink synchronization information, and updates and saves the downlink synchronization information.
  • the terminal device obtains the downlink synchronization information by performing downlink synchronization on the adjacent candidate cell or the downlink beam of the adjacent candidate cell to obtain the downlink synchronization information, or obtains the downlink synchronization information from a downlink synchronization process when measuring the signal quality of the adjacent candidate cell or the downlink beam of the candidate cell.
  • the terminal device selects the downlink synchronization information of the target cell or the target cell downlink beam from the downlink synchronization information it maintains, and resets the downlink synchronization information it maintains.
  • the terminal device receives the neighboring candidate cell configuration information sent by the network device, the neighboring candidate cell configuration information includes information of the neighboring candidate cells configured for the neighboring candidate cell measurement, and the neighboring candidate cells corresponding to the one or more physical cell identification indexes are one or more of the neighboring candidate cells configured for the neighboring candidate cell measurement.
  • the indication information includes reference signal indication information
  • one or more adjacent candidate cell downlink beams corresponding to the reference signal indication information need to perform downlink synchronization maintenance.
  • the terminal device receives reference signal configuration information sent by the network device, the reference signal configuration information includes information of a reference signal set configured for downlink beam measurement of an adjacent candidate cell, and the reference signal indicated by the reference signal indication information is a reference signal in the reference signal set.
  • the reference signal indication information is a bit map
  • the length of the bit map is determined according to the number of reference signals in the reference signal set, and the value of each bit is used to indicate whether the corresponding adjacent candidate cell downlink beam needs to perform downlink synchronization maintenance.
  • the reference signal indication information includes a resource indication identifier of one or more reference signals in the reference signal set
  • the resource indication identifier of the reference signal is an index of the reference signal in the reference signal set
  • one or more adjacent candidate cell downlink beams corresponding to the one or more reference signals need to perform downlink synchronization maintenance.
  • the indication information includes TCI state activation information
  • the neighboring candidate cells or neighboring candidate cell downlink beams corresponding to one or more reference signals in the source reference signals indicated by the TCI state activated by the TCI state activation information need to perform downlink synchronization maintenance.
  • the indication information includes configuration information and TCI state activation information
  • the configuration information includes one or more physical cell identifier indexes, or reference signal indication information
  • one or more adjacent candidate cells or adjacent candidate cell downlink beams indicated by the configuration information and the TCI state activation information need to perform downlink synchronization maintenance.
  • the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal is included in the reference signal or the neighboring candidate cell indicated by the configuration information, or,
  • the reference signal or the neighboring candidate cell indicated by the configuration information is included in the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal.
  • the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal is not included in the reference signal or the neighboring candidate cell indicated by the configuration information, or,
  • the reference signal or the neighboring candidate cell indicated by the configuration information is not included in the source reference signal indicated by the TCI state activated by the TCI state activation information or the neighboring candidate cell corresponding to the source reference signal.
  • a method according to any one of Notes 30 to 32, wherein, when the terminal device receives the configuration information, it performs downlink synchronization maintenance according to one or more adjacent candidate cells or adjacent candidate cell downlink beams indicated by the configuration information; when the TCI state activation information is received after receiving the configuration information, the adjacent candidate cells or adjacent candidate cell downlink beams that need to perform downlink synchronization maintenance are updated according to the TCI state activation information; or,
  • the terminal device When the terminal device receives the TCI state activation information, it performs downlink synchronization maintenance on one or more adjacent candidate cells or adjacent candidate cell downlink beams corresponding to the reference signal activated by the TCI state activation information; when the terminal device receives the configuration information after receiving the TCI state activation information, it updates the adjacent candidate cells or adjacent candidate cell downlink beams that need to perform downlink synchronization maintenance according to the configuration information.
  • a method for sending and receiving information, applied to a terminal device characterized in that the method comprises:
  • the terminal device reports the measurement result to the network device, and the measurement result includes one or more reference signals The measurement results;
  • the terminal device selects an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance according to the reported measurement result, and maintains downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam.
  • the terminal device receives a cell switching command sent by the network device, and the target cell or the target cell downlink beam is one of the adjacent candidate cells or adjacent candidate cell downlink beams of the downlink synchronization information maintained by the terminal device.
  • the measurement results are used for layer 1/layer 2 triggered mobility management.
  • a network device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the method as described in any one of Notes 1 to 15.
  • a terminal device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the method as described in any one of Notes 16 to 38.
  • An information transceiver device applied to a terminal device, characterized in that the device comprises:
  • a first reporting unit configured to report a measurement result to a network device, wherein the measurement result includes a measurement result of one or more reference signals;
  • the second processing unit selects an adjacent candidate cell or an adjacent candidate cell downlink beam related to downlink synchronization maintenance according to the reported measurement result, and maintains downlink synchronization information of the adjacent candidate cell or the adjacent candidate cell downlink beam.
  • a fourth receiving unit receives a cell switching command sent by the network device, wherein the cell switching command includes relevant information of a target cell or a target cell downlink beam, and the target cell or the target cell downlink beam is one of the adjacent candidate cells or adjacent candidate cell downlink beams of the downlink synchronization information maintained by the terminal device.
  • the second processing unit starts to maintain the downlink synchronization information of the adjacent candidate cell or the downlink beam of the adjacent candidate cell until the fourth receiving unit receives the cell switching command.

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

Abstract

Des modes de réalisation de la présente demande concernent un procédé et un appareil de réception/transmission d'informations. L'appareil comprend : une première unité de transmission qui envoie à un dispositif terminal des informations d'indication d'une cellule candidate voisine ou d'un faisceau de liaison descendante de cellule candidate voisine, relatives à une maintenance de synchronisation de liaison descendante ; et une seconde unité de transmission qui envoie une commande de transfert de cellule au dispositif terminal.
PCT/CN2023/086519 2023-04-06 2023-04-06 Procédé et appareil de réception/transmission d'informations Pending WO2024207295A1 (fr)

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