WO2023051114A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2023051114A1
WO2023051114A1 PCT/CN2022/114612 CN2022114612W WO2023051114A1 WO 2023051114 A1 WO2023051114 A1 WO 2023051114A1 CN 2022114612 W CN2022114612 W CN 2022114612W WO 2023051114 A1 WO2023051114 A1 WO 2023051114A1
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Prior art keywords
information
mbs
cell
access network
terminal device
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PCT/CN2022/114612
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English (en)
Chinese (zh)
Inventor
沙桐
李秉肇
常俊仁
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华为技术有限公司
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Publication of WO2023051114A1 publication Critical patent/WO2023051114A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management

Definitions

  • the present application relates to the technical field of communication, and in particular to a communication method and device.
  • a terminal device in an idle state or an inactive state can measure the signal quality of the serving cell and neighboring cells. If the signal quality of the serving cell is poor and the signal quality of the neighboring cell is good, the terminal device can actively Reselecting a cell with better signal quality as the serving cell is called cell reselection.
  • MBS service is a service for multiple terminal devices, such as live broadcast service, public safety service, batch software update service, etc.
  • the present application provides a communication method and device for improving the continuity of MBS services.
  • the present application provides a communication method, and the execution subject of the method may be a terminal device, or may be a chip or a circuit, or a device or module in the terminal device.
  • the method includes: sending first information to an access network device corresponding to the serving cell, wherein the first information is used to request MBS configuration information of neighboring cells of the serving cell; and receiving second information from the access network device, the second information It includes MBS configuration information of at least one neighboring cell of the serving cell.
  • the terminal device Compared with the terminal device after reselecting to the adjacent cell (new cell) of the serving cell, it reads the MBS dedicated system information of the new cell to obtain the configuration information of the MBS control channel, and then reads the MBS control channel to obtain the new cell
  • the terminal device can request the MBS configuration information of the neighboring cell in the serving cell, so that the MBS configuration information of the neighboring cell can be obtained in advance, and there is no need to obtain the MBS configuration information of the cell after reselecting to a new cell.
  • Control channel MBS control channel, MCCH
  • the terminal device may send the first information when a trigger condition is met.
  • the trigger condition may include: there is a cell whose signal quality satisfies a preset condition in a neighboring cell of the serving cell.
  • the trigger condition may include: there is at least one cell whose signal quality meets the preset condition in the neighboring cells of the serving cell, or there are N cells whose signal quality meets the preset condition in the neighboring cells of the serving cell, that is, the serving cell's
  • the number of cells whose signal quality meets the preset condition in the neighboring cell is greater than or equal to N, where N is a positive integer greater than 1, or the proportion of cells whose signal quality meets the preset condition in the neighboring cell of the serving cell is greater than or equal to the threshold value , such as a ratio greater than 0.2.
  • the trigger condition may further include: the signal quality of the serving cell within the time interval T is less than or equal to the fifth threshold.
  • the cell whose signal quality meets the preset condition includes at least one of the following:
  • the second type of cell whose signal quality is greater than the signal quality of the serving cell within the time interval T;
  • a third type of cell whose signal quality is greater than or equal to a third threshold within the time interval T;
  • a third type of cell whose signal quality is greater than that of the serving cell within the time interval T;
  • a fourth type of cell whose signal quality is greater than or equal to a fourth threshold within the time interval T;
  • the first type of cell includes at least one of the following: a cell with a different frequency point with a higher priority than the service frequency point, and a cell with a different system frequency point with a higher priority than the service frequency point;
  • the second type of cell is a cell with different frequency points with the same priority as the service frequency point;
  • the third type of cell is a cell with the same frequency as the service frequency
  • the fourth type of cell includes at least one of the following: a cell of a different frequency point with a lower priority than the serving frequency point, and a cell of a different system frequency point with a lower priority than the serving frequency point.
  • the first information carries an identifier of at least one cell whose signal quality meets a preset condition.
  • the identifier of the at least one cell whose signal quality meets the preset condition may be the identifier of all the cells in the cells whose signal quality meets the preset condition, or the identifiers of some cells in the cells whose signal quality meets the preset condition.
  • the first information is carried in random access message 3 or random access message 5 .
  • the third information from the access network device may be received, and the third information is used to notify the MCCH change; receiving the second information from the access network device
  • the information includes: receiving the second information in the MCCH.
  • the third information carries indication information, and the indication information is used to instruct the MCCH to change the MBS configuration information used for broadcasting neighboring cells.
  • the terminal device can receive the MCCH according to its own needs to obtain the second information, and this method helps to reduce power consumption of the terminal device.
  • the present application provides a communication method, and the execution body of the method may be an access network device, or may be a chip or a circuit, or a device or module in the access network device.
  • the method includes: receiving first information from a terminal device and sending second information to the terminal device, wherein the first information is used to request multicast broadcast service MBS configuration information of neighboring cells of the serving cell, and the second information includes at least MBS configuration information of a neighboring cell.
  • the terminal device Compared with the terminal device after reselecting to the adjacent cell (new cell) of the serving cell, it reads the MBS dedicated system information of the new cell to obtain the configuration information of the MBS control channel, and then reads the MBS control channel to obtain the new cell
  • the terminal device can request the MBS configuration information of the neighboring cell in the serving cell, so that the MBS configuration information of the neighboring cell can be obtained in advance, and there is no need to obtain the cell MCCH after reselecting to a new cell. , so as to reduce the time delay of obtaining the MBS configuration information of the new cell when moving, and improve the continuity of the MBS service.
  • the first information carries an identifier of at least one cell.
  • the first information is carried in random access message 3 or random access message 5 .
  • third information may be sent to the terminal device, where the third information is used to notify the MCCH change.
  • Sending the second information to the terminal device includes: sending the second information in the MCCH.
  • the third information carries indication information, and the indication information is used to instruct the MCCH to change the MBS configuration information used for broadcasting neighboring cells.
  • the terminal device can receive the MCCH according to its own needs to obtain the second information, and this method helps to reduce power consumption of the terminal device.
  • the present application provides a communication method, and the execution body of the method may be a terminal device, or may be a chip or a circuit, or a device or module in the terminal device.
  • the method includes: determining that the first frequency satisfies a preset condition, wherein the preset condition includes that some or all of the candidate cells on the first frequency can provide the first MBS service; or, the preset condition includes that the candidate cells on the first frequency
  • the number or proportion of candidate cells capable of providing the first MBS service is greater than a threshold value; the first frequency is determined to be the frequency with the highest priority in cell reselection evaluation.
  • a judgment condition about the candidate cell on the first frequency providing the current MBS service is added, which can reduce the reselection of the terminal device to a degree that does not support the current MBS service.
  • the probability of the cell which can improve the continuity of the broadcast service.
  • radio resource control radio resource control
  • the method before determining that the first frequency satisfies the preset condition, the method further includes: acquiring first information, where the first information is used to indicate that the first MBS service is provided on the first frequency by Some cells provide the first MBS service.
  • the terminal device may reselect to a cell that does not support the MBS service that the terminal device wants to receive during cell reselection.
  • the judgment condition for determining the first frequency as the highest priority frequency in cell reselection is added, that is, the "candidate cells on the first frequency
  • Some or all of the candidate cells that can provide the first MBS service, or the number or proportion of candidate cells that can provide the first MBS service among the candidate cells on the first frequency is greater than the threshold value"
  • the first frequency is the frequency with the highest priority according to the existing judgment conditions, and the existing method for determining the frequency with the highest priority can be reused as much as possible, and the modification to the protocol is minor.
  • the first information is carried in the system information of the serving cell, or the first information is included in a user service description (USD) provided by the application layer or the service layer of the terminal device.
  • USD user service description
  • the terminal device may also receive second information, where the second information carries a list of cells capable of providing the first MBS service.
  • the terminal device may acquire the PCIs of one or more candidate cells on the first frequency, and a list of PCIs of neighboring cells capable of providing the first MBS service.
  • the terminal device can determine whether the first frequency satisfies the preset condition by comparing the PCI of the candidate cell with the PCI list of the neighboring cell.
  • the present application provides a communication method, and the execution subject of the method may be a terminal device, or may be a chip or a circuit, or a device or module in the terminal device.
  • the method includes: determining to receive the multicast broadcast service MBS service on N frequency points, wherein, N is an integer greater than 1; determining the frequency point with the highest priority in cell reselection evaluation according to the MBS services provided by the N frequency points respectively.
  • the terminal equipment preferentially camps on the frequency point that can provide more MBS services during the cell reselection process, so as to ensure the continuity of more MBS services; or, the highest priority can be guaranteed first
  • the continuity of the MBS service; or, the continuity of the currently ongoing MBS service can be guaranteed first.
  • the frequency point with the highest priority may satisfy the following condition: the number of MBS services that can be provided is the largest.
  • the frequency point with the highest priority may satisfy the following condition: the MBS service that can be provided has the highest priority.
  • the frequency point with the highest priority may satisfy the following condition: it can provide the first MBS service, and the first MBS service is the MBS service currently being received by the terminal device.
  • the continuity of the currently ongoing MBS service can be guaranteed first.
  • the terminal device can first determine the frequency point that can provide the most MBS services that the terminal device is receiving or is interested in as a high-priority frequency point. If there are multiple frequency points that can provide the same number of MBS services, select Among them, the frequency corresponding to the highest MBS service priority is the highest priority.
  • the terminal device first determines the frequency point where the MBS service with the highest priority is located as the high priority frequency point. If there are multiple frequency points with the same priority, select one of the frequency points that the terminal device is receiving or is interested in. The frequency point with the most MBS services is the highest priority.
  • the present application provides a communication method, and the execution body of the method may be a terminal device, or may be a chip or a circuit, or a device or module in the terminal device.
  • the method includes: sending first information to an access network device, where the first information includes information for requesting a first SI message (SI message) and information for requesting a first SIB or MCCH, where the first SIB carries In an SI message, the first SIB is used to configure the MCCH; the MCCH from the access network device is received, wherein the MCCH carries MBS configuration information.
  • SI message SI message
  • SIB a first SIB or MCCH
  • the terminal device can only request the SI message, and the access network device receives the request , it is not known whether the request is for the first SIB or other SIBs (such as SIB2-SIB14) in the SI message.
  • the access network device by explicitly indicating that the request is for the first SIB, that is, the information for requesting the first SIB is included in the first information, so that the access network device can accurately determine the purpose of the terminal device sending the first information It is used to request the first SIB or request MCCH, so that the access network device can start broadcasting MCCH in time, and the terminal device can obtain the configuration information necessary for receiving MBS service and start receiving broadcast data in time, thereby reducing the interruption time of MBS service , To ensure the continuity of the broadcasting business.
  • unnecessary signaling overhead caused by the access network device broadcasting the MCCH when the terminal device is actually requesting the second SIB can also be avoided, saving resources, especially saving control plane radio channel resources.
  • the first SIB may be received from the access network device.
  • the access network equipment can be made to send the configuration information of the MCCH in time, thereby contributing to the continuity of the MBS service.
  • second information may be received from the access network device, where the second information is used to indicate MCCH modification.
  • the terminal device can receive the MCCH in time, so that the continuity of the MBS service can be further improved.
  • the first SI message includes a first SIB and N second SIBs, where N is an integer greater than 0, and the first information may include a first bit corresponding to the first SIB for Indicates that the first SIB is requested.
  • the first information may also include bits corresponding to N second SIBs, respectively indicating whether to request the corresponding second SIB, N is the number of second SIBs included in the first SI message, and N is greater than 0 .
  • the present application provides a communication method.
  • the execution body of the method may be an access network device, or may be a chip or a circuit, or a device or module in the access network device.
  • the method includes: receiving first information from a terminal device, where the first information includes information for requesting a first SI message and information for requesting a first SIB, wherein the first SIB is carried in the first SI message, and the first The SIB is used to configure the MCCH; the first SIB is sent to the terminal equipment.
  • the terminal device can only request the SI message, and the access network device, after receiving the request, It is not known whether the request is for the first or other SIB in the SI message.
  • the access network device by explicitly indicating that the request is for the first SIB, that is, the information for requesting the first SIB is included in the first information, so that the access network device can accurately determine the purpose of the terminal device sending the first information It is used to request the first SIB, so that the access network device can start broadcasting MCCH in time, and the terminal device can obtain the configuration information necessary for receiving broadcast services in time and start receiving broadcast data, thereby reducing the time of MBS service interruption and ensuring broadcast business continuity.
  • unnecessary signaling overhead caused by the access network device broadcasting the MCCH when the terminal device is actually requesting the second SIB can also be avoided, saving resources, especially saving control plane radio channel resources.
  • second information may be sent to the terminal device, where the second information carries MBS configuration information.
  • the access network equipment can be made to send the MBS configuration information in time, thereby contributing to the continuity of the MBS service.
  • third information may be sent to the terminal device, where the third information is used to indicate MCCH modification; sending the second information to the terminal device includes: sending in the MCCH second information.
  • the first SI message includes a first SIB and N second SIBs, where N is an integer greater than 0, and the first information may include a first bit corresponding to the first SIB for Indicates that the first SIB is requested.
  • the first information may also include bits corresponding to N second SIBs, respectively indicating whether to request the corresponding second SIB, N is the number of second SIBs included in the first SI message, and N is greater than 0 .
  • the embodiment of the present application provides a communication device that can implement the method implemented by the terminal device in the first aspect or the third aspect or the fourth aspect or the fifth aspect or any possible design thereof.
  • the apparatus comprises corresponding units or components for performing the method described above.
  • the units included in the device may be implemented by software and/or hardware.
  • the apparatus may be, for example, a terminal device, or a component or a baseband chip, a chip system, or a processor that can support the implementation of the above method in the terminal device.
  • the communication device may include modular components such as a transceiver unit (or communication module, transceiver module) and a processing unit (or processing module), and these modules may perform the above-mentioned first aspect or the third aspect or the fourth aspect
  • the transceiver unit may be a transmitter and a receiver, or a transceiver obtained by integrating a transmitter and a receiver.
  • the transceiver unit may include an antenna and a radio frequency circuit, etc.
  • the processing unit may be a processor, such as a baseband chip.
  • the transceiver unit may be a radio frequency unit, and the processing unit may be a processor.
  • the transceiver unit may be an input-output interface of the system-on-a-chip, and the processing unit may be a processor of the system-on-a-chip, such as a central processing unit (CPU).
  • CPU central processing unit
  • the transceiver unit may be used to perform the receiving and/or sending actions performed by the terminal device in the first aspect or the third aspect or the fourth aspect or the fifth aspect or any possible design thereof.
  • the processing unit may be used to perform actions other than receiving and sending performed by the terminal device in the first aspect or the third aspect or the fourth aspect or the fifth aspect or any possible design thereof. For example, determining the first information, determining that there is a cell whose signal quality satisfies a preset condition in the neighboring cells of the serving cell, and the like. In another example, it is determined that the first frequency satisfies a preset condition, and it is determined that the first frequency is a frequency with the highest priority during cell reselection evaluation, and the like. For another example, it is determined to receive MBS on N frequency points, and the frequency point with the highest priority in cell reselection evaluation is determined according to the MBS services respectively provided by the N frequency points. Another example is to determine the first information and so on.
  • the embodiment of the present application provides a communication device that can implement the method implemented by the access network device in the second aspect or the sixth aspect or any possible design thereof.
  • the apparatus comprises corresponding units or components for performing the method described above.
  • the units included in the device may be implemented by software and/or hardware.
  • the apparatus may be, for example, an access network device, or a component or a baseband chip, a chip system, or a processor that can support the implementation of the above method in the access network device.
  • the communication device may include modular components such as a transceiver unit (or a communication module, a transceiver module) and a processing unit (or a processing module), and these modules may implement the second aspect or the sixth aspect or any of the above-mentioned Corresponding functions of the access network equipment in a possible design.
  • the transceiver unit may be a transmitter and a receiver, or a transceiver obtained by integrating a transmitter and a receiver.
  • the transceiver unit may include an antenna and a radio frequency circuit, etc.
  • the processing unit may be a processor, such as a baseband chip.
  • the transceiver unit When the communication device is a component having the functions of the above access network equipment, the transceiver unit may be a radio frequency unit, and the processing unit may be a processor.
  • the transceiver unit When the communication device is a system-on-a-chip, the transceiver unit may be an input-output interface of the system-on-a-chip, and the processing unit may be a processor of the system-on-a-chip, such as a CPU.
  • the transceiver unit may be used to perform the receiving and/or sending action performed by the access network device in the second aspect or the sixth aspect or any possible design thereof.
  • the processing unit may be used to perform actions other than receiving and sending performed by the access network device in the second aspect or the sixth aspect or any possible design thereof. Such as determining the second information and so on. Another example is to determine the first SIB and so on.
  • a communication system includes a communication device that executes the method shown in the first aspect or any possible design thereof, and executes the method shown in the second aspect or any possible design thereof method of communication means.
  • a communication system in a tenth aspect, includes a communication device for performing the method shown in the third aspect or any possible design thereof, and may further include an access network device.
  • a communication system in an eleventh aspect, includes a communication device for performing the method shown in the fourth aspect or any possible design thereof, and may further include an access network device.
  • a communication system in a twelfth aspect, includes a communication device performing the method shown in the fifth aspect or any possible design thereof, and executing the method described in the sixth aspect or any possible design thereof The communication device of the method shown.
  • a computer-readable storage medium the computer-readable storage medium is used for storing computer instructions, and when the computer instructions are run on a computer, the computer is made to perform the above-mentioned first to sixth aspects or its Any one of the possible designs is shown in the method.
  • a fourteenth aspect there is provided a computer program product containing instructions.
  • the computer program product is used to store computer instructions.
  • the computer instructions When the computer instructions are run on a computer, the computer executes the first to sixth aspects or any of them.
  • One possible design is shown in the approach.
  • a circuit the circuit is coupled to a memory, and the circuit is used to execute the method shown in the first aspect to the sixth aspect or any possible design thereof.
  • the circuitry may include chip circuitry.
  • FIG. 1 is a multicast schematic diagram of an embodiment of the present application
  • FIG. 2 is a schematic diagram of the architecture of a network system according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of an access network device according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • MBS is a service transmitted to multiple terminal devices at the same time, such as live broadcast service, public safety service, batch software update service, etc.
  • MBS may include multicast service, multicast service, broadcast service and so on.
  • the MBS comes from the data server. First, the data server sends the MBS data to the core network device, then the core network device sends the MBS data to the access network device, and finally the access network device sends the MBS data to at least one terminal that receives the MBS. equipment. When the core network device sends MBS data to the access network device, the MBS data is transmitted through a common transmission channel, that is, the MBS session.
  • the access network device When the access network device sends the data to the terminal device, there are two transmission methods: the first One can adopt point to multi-point (point to multi-point, PTM) transmission mode; the second can adopt point to point (point to point, PTP) transmission mode. As shown in Figure 1.
  • PTM point to multi-point
  • PTP point to point
  • MBS is only an exemplary naming of multicast services, and the naming of multicast services may be different under different communication standards.
  • multicast services may be called Multimedia broadcast multicast service (multimedia broadcast multicast service, MBMS), multicast service in new air interface (new radio, NR) can be called MBS, in future communication development, multicast service can also be named other, this application does not Be specific.
  • Cell reselection A terminal device in the RRC idle state/inactive state will measure the signal quality of the serving cell and neighboring cells. If the signal quality of the serving cell is poor and the signal quality of the neighboring cell is good, the terminal device will Actively reselect a cell with higher priority or better signal quality as the serving cell. This process is called cell reselection.
  • the process of cell reselection includes starting neighbor cell measurement (judging whether to start neighbor cell measurement according to the measurement start conditions), reselection evaluation judgment (judging whether the signal quality of the neighbor cell meets the cell reselection standard, if it meets the cell reselection, execute cell reselection, otherwise it will still stay In the current cell), cell reselection execution (receiving the system message of the target cell, and camping in the new cell if the target cell has no access restrictions) three stages.
  • the signal quality can be reference signal received power (reference signal received power, RSRP), or measured cell RX level value (Measured cell RX level value, Q rxlevmea ), or reference signal received quality (reference signal received quality, RSRQ), or measured Cell quality value (measured cell quality value, Q qualmeas ), or cell selection reception level value (S rxlev , Cell selection RX level value, unit dB), or cell selection quality value (S qual , Cell selection quality value, unit dB) , or the RSRP measurement quantity Q meas used for cell reselection, or the Rs of the serving cell in the cell ranking criterion, or the Rn of the neighboring cell in the cell ranking criterion, etc., which are not limited in this embodiment of the present application.
  • At least one in the embodiments of this application refers to one or more, and “multiple” refers to two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • the character "/" generally indicates that the contextual objects are an "or” relationship.
  • At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple .
  • first and second are used to distinguish multiple objects, and are not used to limit the size, content, order, and timing of multiple objects , priority or importance, etc.
  • first threshold and the second threshold are only used to distinguish different thresholds, and do not represent differences in size, priority, or importance of the two thresholds.
  • MBS services are services for multiple terminal devices, such as live broadcast services, public security services, and batch software update services.
  • a terminal device in an idle state or an inactive state can measure the signal quality of the serving cell and neighboring cells. If the signal quality of the serving cell is poor and the signal quality of the neighboring cell is good, the terminal device can actively reselect the priority The cell with the highest or better signal quality is used as the serving cell. This process is called cell reselection. Since the current cell reselection process is performed for unicast services, after the MBS service is introduced, if the existing cell reselection process is continued, the continuity of the MBS service will be affected.
  • the MBS service is configured in a two-step configuration manner: the access network device broadcasts an MBS-specific system message (such as an MBS SIB), and the MBS-specific system message carries MCCH configuration information.
  • the MBS configuration information is then transmitted on the MCCH within the configured transmission window.
  • a terminal device interested in the MBS service enters a cell that provides the above-mentioned MBS dedicated system message, and receives an MCCH change notification, it will obtain the MBS configuration information on the MCCH. Since the MBS configuration information is cell-level configuration information, which can include the ID of the MBS session provided by the cell, configuration and scheduling information of the MBS session, etc., the MBS configuration information carried by the MCCH of each cell may be different.
  • a terminal device in the reselection state When a terminal device in the reselection state performs cell reselection, it needs to read the MBS dedicated system information of the reselected cell to obtain the configuration information of the MCCH after accessing the reselected cell, and then read the MCCH to obtain the MBS configuration information of the reselected cell configuration information.
  • This method causes a large time delay, which causes interruption of the MBS service and affects the continuity of the MBS service.
  • the terminal device adopts the following mechanism to perceive the frequency point/area providing the MBS service: the application layer/service layer of the terminal device provides the user service description (user service description, USD) of the MBS service, where the USD includes MBS session ID such as temporary mobile group identity (temporary mobile group identity, TMGI), session start time and end time, frequency point of MBS session, MBS service area identity (service area identity, SAI), wherein each service area consists of a Composition of group districts.
  • the terminal device uses the following mechanism to perceive the frequency point/area that provides the MBS service: the serving cell broadcasts a system message (such as SIB15), and the MBS SAI of the current frequency point and each adjacent frequency point is provided in the system message.
  • a system message such as SIB15
  • Condition 1 If the serving cell does not broadcast system information (such as SIB15), but the frequency point is the frequency point provided in the USD of this MBS service; if the serving cell broadcasts system information (such as SIB15), then the frequency point broadcast in the system message
  • the SAI of the frequency point includes the SAI indicated for the frequency point in the USD of the MBS service.
  • the terminal device supports single-cell point-to-multipoint transmission (single-cell point-to-multipoint, SC-PTM) reception, and the candidate cell on the frequency point is broadcasting the MBS dedicated system message.
  • SC-PTM single-cell point-to-multipoint
  • SI system message
  • the SI in the NR network is divided into minimum SI and other SI.
  • the minimum SI includes master information block (master information block, MIB) and system information block 1 (system information block 1, SIB1), and other SI contains multiple The SIBs broadcast in the smallest SI (eg SIBs other than SIB1).
  • SIB1 carries the scheduling information of the SI message.
  • Each SI message can carry one or more SIBs.
  • the terminal device can actively request broadcast, that is, request SI on-demand. For example, the terminal device can send an SI request message to the access network device to request an SI message containing the required SI.
  • the MBS SIB carrying MCCH configuration information belongs to other SIs. If the access network device supports on-demand request for SI, the terminal device can request the above MBS SIB in an on-demand manner. However, if the MBS SIB and other SIBs are in one SI message, since the terminal device can only request the SI Message, the access network device does not know whether the request is for the MBS SIB in the SI message or other SIBs after receiving the request.
  • the access network device When the access network device does not broadcast MCCH, for example, the access network device chooses to use On-demand MCCH to send MCCH, when the terminal device requests an SI message, if the access network device only broadcasts the SIB on the SI message instead of broadcasting If the MCCH is not used, the terminal device cannot obtain the MBS configuration information, which will result in the interruption of the MBS service or increase the delay in receiving the MBS service. However, if the access network device starts to broadcast the MCCH every time it receives a request message of the SI message containing the MBS dedicated system message, unnecessary signaling overhead and resource overhead may be brought.
  • embodiments of the present application provide a communication method and device for improving the continuity of MBS services.
  • the method and the device are based on the same inventive concept, and since the principles of the method and the device to solve problems are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • the communication method provided by this application can be applied to various communication systems, for example, it can be Internet of Things (Internet of Things, IoT), Narrow Band Internet of Things (NB-IoT), LTE, or the first
  • the fifth generation (5th generation, 5G) communication system can also be a hybrid architecture of LTE and 5G, or it can be a new communication system that appears in 6G or future communication development.
  • the 5G communication system described in this application may include at least one of a non-standalone (NSA) 5G communication system and a standalone (standalone, SA) 5G communication system.
  • the communication system may also be a machine to machine (machine to machine, M2M) network, a machine type communication (machine type communication, MTC) or other networks.
  • the communication method provided by the embodiment of the present application can be applied to a communication system, and the communication system includes an access network device and six terminal devices, that is, user equipment (user equipment, UE) 1-UE6.
  • UE1-UE6 can send uplink information to access network equipment, and the access network equipment can receive uplink data sent by UE1-UE6.
  • UE4-UE6 may also form a sub-communication system.
  • Access network devices can send downlink information to UE1, UE2, UE3, and UE5, and UE5 can send downlink information to UE4 and UE6 based on device-to-device (D2D) technology, or between UE4 and UE6 can be based on device-to-device (D2D) technology.
  • D2D device-to-device
  • D2D technologies communicate with each other.
  • inventions of the present application can also be used in other communication systems, as long as multicast transmission is required in the communication system.
  • the embodiments of the application are applicable not only to the scenario where one access network device communicates with multiple UEs, but also to the scenario where multiple access network devices cooperate to communicate with one or more UEs at the same time (for example, a single frequency network (single frequency network) , SFN).
  • Figure 2 is only a schematic diagram, and does not specifically limit the type of the communication system, and the number and type of devices included in the communication system.
  • the terminal equipment shown above may be a UE, a terminal (terminal), an access terminal, a terminal unit, a terminal station, a mobile station (mobile station, MS), a remote station, a remote terminal, a mobile terminal (mobile terminal), a wireless communication device, Terminal agent, terminal equipment, cellular telephone, cordless telephone, session initiation protocol (SIP) telephone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (PDA) equipment, with Handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in future 5G networks or terminal devices in future evolved PLMN networks, etc.
  • Terminal agent terminal equipment
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • the terminal device may have a wireless transceiver function, which can communicate with one or more access network devices of one or more communication systems (such as wireless communication), and accept network services provided by the access network devices.
  • access The network equipment includes but not limited to the access network equipment shown in FIG. 2 .
  • terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; terminal equipment can also be deployed on water (such as ships, etc.); terminal equipment can also be deployed in the air (such as aircraft, balloons and satellites, etc.) .
  • the terminal device may be a mobile phone, a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal, an augmented reality (augmented reality, AR) terminal, an industrial control (industrial control ), wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety , wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the terminal device may also be a communication chip with a communication module, or a vehicle with a communication function, or a vehicle-mounted device (such as a vehicle-mounted communication device, a vehicle-mounted communication chip), etc.
  • Access network equipment refers to equipment that provides network access functions, such as wireless access network (radio access network, RAN) base station (or RAN equipment) and so on. Access network equipment can be specific Including a base station (base station, BS), or including a base station and a radio resource management device for controlling the base station, etc.
  • the access network device may also include a relay station (relay device), an access point, and a base station in the future 5G network, The base station or NR base station in the future evolution of the PLMN network.
  • the access network device can be a wearable device or a vehicle-mounted device.
  • the access network device can also be a communication chip with a communication module.
  • access network equipment includes but is not limited to: next-generation base station (g nodeB, gNB) in 5G, evolved node B (evolved node B, eNB) in LTE system, radio network controller (radio network controller, RNC) ), the wireless controller under the cloud radio access network (cloud radio access network, CRAN) system, the base station controller (base station controller, BSC), the home base station (for example, home evolved nodeB, or home node B, HNB), Baseband unit (baseBand unit, BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, can also be the evolution type (eNB or eNodeB) in LTE , can also be a base station device in a 5G network or an access network device in a future evolved PLMN network, or a wearable device or a vehicle-mounted device.
  • next-generation base station g nodeB, gNB
  • evolved node B evolved node B
  • the access network equipment may include a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU).
  • the access network device may also include an active antenna unit (active antenna unit, AAU).
  • the CU implements some functions of the access network equipment, and the DU implements some functions of the access network equipment.
  • the CU is responsible for processing non-real-time protocols and services, and implements RRC and packet data convergence protocol (PDCP) layer functions.
  • the DU is responsible for processing physical layer protocols and real-time services, realizing the functions of the radio link control (radio link control, RLC) layer, media access control (media access control, MAC) layer and physical layer (physical layer, PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical layer
  • the AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , or, sent by DU+AAU.
  • the access network device may be a device including one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into access network equipment in the RAN, and the CU can also be divided into access network equipment (which can be called CN equipment) in the core network (core network, CN), which is not limited in this application. .
  • the access network equipment can be connected to the CN equipment, and the core network equipment can be used to provide core network services for terminal equipment connected to the access network equipment.
  • Core network devices may correspond to different devices in different systems.
  • the core network equipment can correspond to the serving GPRS support node (SGSN) of general packet radio service (GPRS) and/or the gateway GPRS Support Node (GGSN) of GPRS .
  • the core network equipment may correspond to a mobility management entity (mobility management entity, MME) and/or a serving gateway (serving gateway, S-GW), etc.
  • core network equipment can correspond to access and mobility management function (access and mobility management function, AMF) entity, session management function (session management function, SMF) entity or user plane function (user plane function, UPF) entity, etc. .
  • Fig. 3 shows a possible structural schematic diagram of the device.
  • the device shown in Figure 3 may be a communication device, or a chip applied in a communication device, or other combined devices, components (or components) having functions of the communication device shown in this application, etc., wherein the communication device may be the communication device of this application
  • the access network device shown in the embodiment or may also be the terminal device shown in the embodiment of the present application.
  • the device may include a processing module 310 and a transceiving module 320 .
  • the transceiver module 320 may be a functional module, and the functional module can complete both the sending operation and the receiving operation.
  • the transceiver module 320 may be used to perform all sending operations and receiving operations performed by the communication device.
  • the transceiver module 320 can be considered as a sending module, and when the receiving operation is performed, the transceiver module 320 can be considered as a receiving module; or, the transceiver module 320 can also be two functional modules, and the transceiver module 320 can be regarded as the two A general term for two functional modules, the two functional modules are the sending module and the receiving module, the sending module is used to complete the sending operation, for example, the sending module can be used to perform all the sending operations performed by the communication device, and the receiving module is used to complete the receiving Operation, the receiving module may be used to perform all receiving operations performed by the communication device.
  • the transceiver module 320 may include a transceiver and/or a communication interface.
  • Transceivers may include antennas and radio frequency circuits, among others.
  • the communication interface is such as an optical fiber interface.
  • the processing module 310 may be a processor, such as a baseband processor, and the baseband processor may include one or more CPUs.
  • the transceiver module 320 may be a radio frequency unit, and the processing module 310 may be a processor, such as a baseband processor.
  • the transceiver module 320 may be an input/output interface of a chip (such as a baseband chip), and the processing module 310 may be a processor of the system-on-a-chip, and may include one or more central processing units.
  • processing module 310 in the embodiment of the present application may be implemented by a processor or a processor-related circuit component
  • transceiver module 320 may be implemented by a transceiver or a transceiver-related circuit component.
  • the processing module 310 can be used to perform all the operations performed by the access network device in the embodiment of the present application except the transceiving operation , such as processing operations, and/or other processes used to support the techniques described herein.
  • the transceiver module 320 may be used to perform all receiving and sending operations performed by the access network device in the embodiment of the present application, and/or to support other processes of the technology described herein.
  • the processing module 310 can be used to perform all the operations performed by the terminal device in the embodiment of the application except the sending and receiving operations, such as processing operation, and/or other processes for supporting the technology described herein, such as determining that there is a cell whose signal quality satisfies a preset condition in the neighboring cells of the serving cell.
  • the transceiver module 320 may be used to perform all the receiving and sending operations performed by the terminal device in the embodiment of the present application, and/or to support other processes of the technologies described herein.
  • Fig. 4 shows another possible structural diagram of a terminal device.
  • the communication device includes structures such as a processor, a memory, a radio frequency unit (or radio frequency circuit), an antenna, and an input and output device.
  • the processor is mainly used to process communication protocols and communication data, control devices, execute software programs, process data of software programs, and the like.
  • Memory is primarily used to store software programs and data.
  • the radio frequency unit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal equipment may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 4 only one memory and processor are shown in FIG. 4 . In an actual terminal device product, there may be one or more processors and one or more memories.
  • a memory may also be called a storage medium or a storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in this embodiment of the present application.
  • the antenna and the radio frequency circuit with the transceiver function can be regarded as the transceiver unit of the terminal equipment (the transceiver unit can be a functional unit, and the functional unit can realize the sending function and the receiving function; or, the transceiver unit can also be It includes two functional units, namely a receiving unit capable of receiving functions and a sending unit capable of transmitting functions), and the processor with processing functions is regarded as the processing unit of the terminal device.
  • the terminal device includes a transceiver unit 410 and a processing unit 420 .
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, and the like.
  • a processing unit may also be called a processor, a processing board, a processing module, a processing device, and the like.
  • the device in the transceiver unit 410 for realizing the receiving function may be regarded as a receiving unit
  • the device in the transceiver unit 410 for realizing the sending function may be regarded as a sending unit, that is, the transceiver unit 410 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes also be referred to as a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit, etc.
  • the sending unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit, etc.
  • the transceiver unit 410 may correspond to the transceiver module 320 , or in other words, the transceiver module 320 may be implemented by the transceiver unit 410 .
  • the transceiver unit 410 is configured to perform the sending operation and the receiving operation of the terminal device in the embodiments shown in this application, and/or other processes for supporting the technologies described herein.
  • the processing unit 420 may correspond to the processing module 310, or in other words, the processing module 310 may be realized by the processing unit 420.
  • the processing unit 420 is configured to perform other operations on the terminal device in the embodiment shown in this application except the transceiving operation, for example, to perform all receiving and sending operations performed by the terminal device in the embodiment shown in this application, and/or or other processes used to support the techniques described herein.
  • Fig. 5 shows another possible structural diagram of an access network device.
  • the access network device includes structures such as a processor, a memory, a radio frequency unit (or radio frequency circuit) or an antenna.
  • the processor is mainly used to process communication protocols and communication data, control access network devices, execute software programs, and process data of software programs.
  • Memory is primarily used to store software programs and data.
  • the radio frequency unit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • the access network device may include a transceiver unit 510 and a processing unit 520, wherein the transceiver unit 510 may include a sending unit and a receiving unit, or the transceiver unit 510 may be a unit.
  • the transceiving unit 510 may correspond to the transceiving module 320 in FIG. 3 , that is, the transceiving unit 510 performs the actions performed by the transceiving module 320 .
  • the transceiver unit 510 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 511 and a radio frequency unit 512 .
  • the transceiver unit 510 is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals.
  • the processing unit 520 is mainly used to perform baseband processing, control access network equipment, and the like.
  • the transceiver unit 510 and the processing unit 520 may be physically set together, or physically separated, that is, distributed access network equipment.
  • the transceiver unit 510 may include one or more radio frequency units, such as a remote radio unit (remote radio unit, RRU), and the processing unit 520 may include one or more BBUs (also referred to as DUs).
  • RRU remote radio unit
  • BBUs also referred to as DUs
  • the processing unit 520 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network of a single access standard (such as an LTE network), or may separately support wireless access networks of different access standards. Radio access network (such as LTE network, 5G network or other networks).
  • the processing unit 520 also includes a memory 521 and a processor 522 .
  • the memory 521 is used to store necessary instructions and data.
  • the processor 522 is used to control the access network device to perform necessary actions, for example, to control the access network device to execute the operation procedures related to the access network device in the embodiments shown in this application.
  • the memory 521 and the processor 522 may serve one or more single boards. That is to say, memory and processors can be set independently on each single board. It may also be that multiple single boards share the same memory and processor. In addition, necessary circuits can also be set on each single board.
  • the network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
  • the MBS service may also be called “MBS service”, “MBS broadcast service”, “MBS session”, “MBS broadcast service”, “MBS” and so on.
  • frequency and "frequency point" can be replaced with each other.
  • FIG. 6 it is a schematic flowchart of a communication method provided by the present application. The method includes:
  • the terminal device sends first information to the access network device corresponding to the serving cell.
  • the access network device receives the first information.
  • the first information is used to request MBS configuration information of neighboring cells of the serving cell.
  • the terminal device may send the first information to the access network device on the serving cell.
  • the access network device corresponding to the serving cell may refer to the access network device that implements the function of the serving cell.
  • the serving cell may also be a cell where the terminal device currently resides (or accesses).
  • the adjacent cell refers to a cell adjacent to the serving cell, or a cell at a frequency adjacent to the current serving frequency, where the serving frequency is the frequency of the cell where the terminal device currently resides.
  • the terminal device may send the first information when a trigger condition is met.
  • the trigger condition may include: there is a cell whose signal quality satisfies a preset condition in a neighboring cell of the serving cell.
  • the terminal device may send the first information when it is determined that there is a cell whose signal quality meets a preset condition in a neighboring cell of the serving cell.
  • the trigger condition may include: there is at least one cell whose signal quality satisfies a preset condition among the neighboring cells of the serving cell.
  • the trigger condition may include: there are N cells whose signal quality meets the preset condition in the neighboring cells of the serving cell, that is, the number of cells whose signal quality meets the preset condition in the neighboring cells of the serving cell is greater than or equal to N, in an example , the terminal device may determine that there are N cells whose signal quality meets the preset condition in the neighboring cells of the serving cell, that is, when the number of cells whose signal quality meets the preset condition in the neighboring cells of the serving cell is greater than or equal to N, send For the first information, N is an integer greater than 1.
  • the trigger condition may include: the ratio of cells whose signal quality meets the preset condition in the neighboring cells of the serving cell is greater than or equal to a threshold value, for example, the ratio is greater than 0.2.
  • a threshold value for example, the ratio is greater than 0.2.
  • the cell whose signal quality meets the preset condition may include, but is not limited to, at least one of the following:
  • the first type of cell whose signal quality is greater than or equal to the first threshold within the time interval T, wherein the first type of cell includes: a cell with a different frequency point with a higher priority than the service frequency point, a cell with a different frequency point with a higher priority than the service frequency point The cell of the system frequency point, etc.;
  • the second type of cell whose signal quality is greater than or equal to the second threshold within the time interval T, wherein the second type of cell includes: a cell with a different frequency point with the same priority as the service frequency point, a cell with a different frequency point with the same priority as the service frequency point The cell of the system frequency point, etc.;
  • the second type of cell whose signal quality is greater than the signal quality of the serving cell within the time interval T;
  • the third type of cells whose signal quality is greater than or equal to the third threshold within the time interval T may include: cells with the same frequency as the service frequency;
  • a third type of cell whose signal quality is greater than that of the serving cell within the time interval T;
  • the fourth type of cells whose signal quality is greater than or equal to the fourth threshold within the time interval T may include: cells with different frequency points lower in priority than the service frequency point, cells with lower priority than the service frequency point Cells with different system frequencies, etc.
  • the trigger condition may further include: the signal quality of the serving cell within the time interval T is less than or equal to the fifth threshold.
  • the first threshold, the second threshold, the third threshold, the fourth threshold, and the fifth threshold may be the same or different, which are not specifically limited here.
  • the above thresholds can be fixed in the protocol, or obtained by receiving signaling from the access network device, where the signaling can be high-level signaling such as RRC layer signaling, MAC layer signaling, etc., or the signaling can be It is physical layer signaling, such as downlink control information (DCI), or a combination of high-level signaling and physical layer signaling, which is not limited by the embodiments of the present application.
  • DCI downlink control information
  • the first information is used to trigger the access network device to send the MBS configuration information of the neighboring cells of the serving cell, and the access network device specifically sends the MBS configuration information of the neighboring cells, which may be the terminal device Indicated by the first information, for example, the first information may carry an identifier of at least one neighboring cell.
  • the MBS configuration information of the neighboring cells to be sent by the access network device may also be determined by the access network device itself.
  • the first information may carry the identifier of at least one neighboring cell of the serving cell, specifically, may carry at least An identifier of a cell whose signal quality satisfies a preset condition.
  • the identifier of the at least one cell whose signal quality meets the preset condition may be the identifier of all the cells in the cells whose signal quality meets the preset condition, or the identifiers of some cells in the cells whose signal quality meets the preset condition.
  • the identity of the cell may be a physical cell identity (physical cell identity, PCI) or the like.
  • the first information may not carry the identifier of the neighboring cell.
  • the access network device may determine which neighboring cell's MBS configuration information is sent by the access network device.
  • the first information may also carry MBS session identification information requested by the terminal device, such as TMGI, and/or MBS session ID.
  • the access network device may send the MBS configuration information corresponding to the MBS session identifier information.
  • the access network device sends the second information to the terminal device.
  • the terminal device receives the second information.
  • the second information includes MBS configuration information of at least one neighboring cell of the serving cell.
  • the MBS configuration information may be MBS broadcast configuration information in the 3GPP protocol, or may be MBS-related configuration information in future communication development, such as MBS multicast configuration information, MBS-specific configuration information, and the like.
  • the MBS configuration information of the neighboring cell may include at least one of the following: an ongoing MBS session identifier (identification, ID) of the neighboring cell, a group radio network temporary identifier (G-RNTI), a broadcast MBS radio bearer (MBS radio bearer, MRB) configuration, MBS traffic channel (MBS traffic channel, MTCH) scheduling information, etc.
  • ID an ongoing MBS session identifier
  • G-RNTI group radio network temporary identifier
  • MBS radio bearer MRB
  • MBS traffic channel MBS traffic channel
  • MTCH MBS traffic channel scheduling information
  • the access network device may obtain the MBS configuration information of the neighboring cell through the X2 interface or operations administration & maintenance (operations administration&maintenance, OAM) and other methods.
  • OAM operations administration & maintenance
  • the serving cell and the neighboring cell belong to the same access network device, or the DU corresponding to the serving cell and the DU corresponding to the neighboring cell are connected to the same CU, then the access network device corresponding to the serving cell can Obtain the MBS configuration information of the neighboring cell.
  • the terminal device Compared with the terminal device after reselecting to the adjacent cell (new cell) of the serving cell, it reads the MBS dedicated system information of the new cell to obtain the configuration information of the MBS control channel, and then reads the MBS control channel to obtain the new cell
  • the terminal device can request the MBS configuration information of the neighboring cell in the serving cell, so that the MBS configuration information of the neighboring cell can be obtained in advance, and there is no need to obtain the cell MCCH after reselecting to a new cell. , so as to reduce the time delay of obtaining the MBS configuration information of the new cell when moving, and improve the continuity of the MBS service.
  • the sending time of the first information may be earlier than the completion of cell reselection, or the sending time of the first information may be before the terminal equipment camps on the reselected cell, for example, the sending time of the first information may be earlier than The time when the terminal equipment receives the system information block (such as SIB1) of the reselected cell.
  • SIB1 system information block
  • the terminal device when the terminal device is in an idle state or an inactive state, it sends the first information to the access network device corresponding to the serving cell when the foregoing trigger condition is met.
  • the first information may be indicated by the random access message 3 or the random access message 5, for example, the first information may be carried in the random access message 3 or the random access message 5.
  • the random access message 3 may be an RRC establishment request message (RRCSetupRequest), or an RRC recovery request message (RRCResumeRequest), or an RRC reestablishment request message (RRCReestablishmentRequest), etc.
  • the random access message 5 may be an RRC setup complete message (RRCSetupComplete) or an RRC recovery complete message (RRCResumeComplete), or an RRC reestablishment complete message (RRCReestablishmentComplete), etc.
  • the first information may be indicated by random access message 1, for example, the terminal device may indicate the first information by using a dedicated preamble (preamble) or a dedicated random access channel opportunity (RACH occasion, RO).
  • preamble a dedicated preamble
  • RACH occasion a dedicated random access channel opportunity
  • the second information may be carried in the MCCH, that is, the terminal device may receive the second information in the MCCH.
  • the access network device may send third information to the terminal device before sending the second information, where the third information is used to notify the MCCH change, for example, the third information may be MCCH change notify.
  • the MCCH change notification indicated by the third information is used to indicate that the content of the current MCCH is changed.
  • the third information when the third information notifies that the MCCH is changed, it may not indicate the changed MCCH, or may also indicate the changed MCCH, which is not specifically limited here.
  • the third information may also carry indication information, and the indication information is used to instruct the MCCH to change the MBS configuration information used for broadcasting neighboring cells.
  • the terminal device that wants to receive the MBS configuration information of the neighboring cell can acquire the updated MCCH within the MCCH transmission window according to the configured MCCH repetition period.
  • the third information may also indicate that the MCCH content of the current cell has not been changed or the MBS configuration information of the current cell has not been changed.
  • the terminal device can decide whether to receive the MCCH according to its own needs to obtain the second information. For example, a terminal device that does not want to receive the configuration information of the adjacent cell MCCH or the adjacent cell MBS (for example, a terminal without mobility requirements) may not Deduplication detection and/or reception of MCCH, which helps to reduce power consumption of terminal equipment.
  • the second information may also be sent through dedicated signaling.
  • the access network device may send the second information through the random access message 4, and the random access message 4 may be an RRC recovery message (RRCResume message) or an RRC establishment ( RRCSetup message) or RRC re-establishment (RRCReestablishment message) and so on.
  • the access network device may send the second information by using another RRC message.
  • the terminal device can request the MBS configuration information of the neighboring cell in the serving cell, so that the MBS configuration information of the neighboring cell can be obtained in advance, and there is no need to obtain the MCCH of the cell after reselecting to a new cell, thereby reducing the need to obtain the MBS configuration information when moving.
  • the time delay of the MBS configuration information of the new cell improves the continuity of the MBS service.
  • the access network device can explicitly indicate in the MCCH change notification that the MCCH change is used to provide MBS configuration information of neighboring cells, so that the terminal device can judge whether to The updated MCCH needs to be obtained, so that terminal equipment without mobility requirements can avoid repeatedly receiving the MCCH, and avoid additional power consumption to the terminal equipment.
  • FIG. 7 it is a schematic flowchart of another communication method provided by the present application.
  • the method includes:
  • the terminal device determines that the first frequency satisfies a preset condition.
  • the preset condition includes that some or all of the candidate cells on the first frequency can provide the first MBS service; or, the preset condition includes the number of candidate cells that can provide the first MBS service among the candidate cells on the first frequency Or the ratio is greater than the threshold.
  • the terminal device may determine whether the candidate cell on the first frequency can provide the first MBS service in the following manner: the terminal device receives second information, and the second information carries a list of cells capable of providing the first MBS service.
  • the terminal device can obtain the PCI of one or more candidate cells on the first frequency by measuring the synchronization signal and physical broadcast channel block (synchronization signal and PBCH block, SSB) of the neighboring cell.
  • the terminal device acquires the list of neighboring cells capable of providing the first MBS service through the neighboring cell information carried in the MCCH broadcast by the serving cell.
  • the terminal device can determine whether the first frequency satisfies the preset condition by comparing the PCI of the candidate cell on the first frequency with the PCI list of neighboring cells providing the first MBS service.
  • the preset conditions may also include the following conditions:
  • Condition 1 If the serving cell does not broadcast a system message (such as SIB15) for MBS service continuity, but the first frequency is the frequency provided in the USD of this MBS service; if the serving cell broadcasts a system message for MBS service continuity system message (such as SIB15), the one or more identifiers of the frequency point broadcast in the system message include the identifier provided in the USD of this MBS service, or one or more identifiers of the frequency point broadcast in the system message The ID is the same as the identifier provided in the USD of this MBS service, and the identifier can be at least one of MBS session ID, or TMGI, or MBS session group identifier, or TMGI group identifier, or service area identifier, or cell group identifier , or a combination of the above.
  • a system message such as SIB15
  • SIB15 system message for MBS service continuity system message
  • the SIB1 of the candidate cell on the first frequency includes the scheduling information of the first SIB; or the candidate cell on the first frequency can provide the first SIB, wherein the first SIB is used to configure the MCCH SIBs, such as the first SIB is the MBS SIB.
  • Condition three the terminal device is receiving or is interested in receiving the first MBS service, and can only camp on the first frequency to receive the first MBS service.
  • the terminal device determines that the first frequency is the frequency with the highest priority during cell reselection evaluation.
  • the terminal device may also use a cell capable of providing the first MBS service on the first frequency as a high priority cell during cell reselection.
  • a cell capable of providing the first MBS service on the first frequency as a high priority cell during cell reselection.
  • the terminal device does not change the priority of the cell during cell reselection.
  • the terminal device may reselect to a cell that does not support the MBS service that the terminal device wants to receive during cell reselection.
  • the condition that the candidate cell on the first frequency provides the current MBS service is added, which can reduce the reselection of the terminal device to a cell that does not support the current MBS service to a certain extent. The probability, which can improve the continuity of the MBS third information.
  • the embodiment of the present application can effectively prevent terminal devices from accessing a cell that cannot provide the MBS service that the terminal device wants to receive , which can effectively avoid the occurrence of cell congestion in the above situation.
  • the terminal device may execute the method shown in FIG. 7 under the condition that the mode of providing the first MBS service on the first frequency is to provide the first MBS service on some cells of the first frequency.
  • the terminal device may determine the manner in which the first MBS service is provided on the first frequency in the following manner: the terminal device may obtain a system message broadcast by the access network device for service continuity of the MBS service (For example, SIB15) Determine the way to provide the first MBS service on the first frequency.
  • the system message broadcast by the access network device for the continuity of the MBS service may carry the first information, and the first information indicates that the first information is provided on the first frequency. The way of the first MBS service.
  • the access network device may carry frequency information and MBS information corresponding to the frequency in the system information of the serving cell, such as carrying information about MBS services that can be provided by the current frequency and adjacent frequencies, for example, carrying the current frequency and related The MBS service ID and/or TMGI, or the MBS service group ID that can be provided by adjacent frequencies.
  • the access network device also indicates whether the MBS service is deployed on all cells of the frequency or some cells.
  • the manner of providing the first MBS service on the first frequency is indicated by 1 bit information.
  • the access network device may obtain frequency information and MBS information corresponding to the frequency through an X2 interface or OAM.
  • the terminal device may also determine the method of providing the first MBS service on the first frequency in the following manner: the terminal device may obtain the first information from the USD provided by the application layer or the service layer of the terminal device, and the first information indicates that on the first frequency A manner of providing the first MBS service.
  • the terminal device can obtain the frequency for providing MBS services through the USD provided by the application layer or the service layer, and at the same time, the USD also indicates whether the MBS service is deployed on all cells of the frequency, or only on a part of the frequency Community deployment.
  • the manner of providing the first MBS service on the first frequency is indicated by 1 bit information.
  • providing the first MBS service on some cells of the first frequency means that there are cells that cannot provide the first MBS service on the first frequency in a given geographical area, or, the On the first frequency, only cells located in a specific area can provide the first MBS service, and the cells in the specific area may refer to cells deployed with the first MBS service.
  • “Providing the first MBS service on some cells of the first frequency” can also be described as “providing the first MBS service dynamically on the first frequency", “providing the first MBS service on the first frequency according to the cell granularity (per cell)” service", “the first MBS service is deployed on the first frequency according to the cell” and so on.
  • Providing the first MBS service on all cells on the first frequency means that all cells on the first frequency in a given geographical area can provide the first MBS service.
  • the geographical area may be in the tracking area ( Tracking area, TA), or within the range of the RAN, or within the effective area of the SIB, which is not limited in this embodiment of the present application.
  • Providing the first MBS service on all cells of the first frequency can also be described as “providing the first MBS service non-dynamically (or statically) on the cells of the first frequency", “providing the first MBS service on the first frequency according to frequency granularity" An MBS service", "the first MBS service is deployed on the first frequency according to the frequency” and so on.
  • FIG. 8 it is a schematic flowchart of another communication method provided by the present application.
  • the embodiment of the present application when the terminal device is interested in one or more MBS services on multiple frequency points, the embodiment of the present application designs a frequency point priority judgment mechanism so that the terminal device can A frequency point with the highest priority is determined to camp on first.
  • the method includes:
  • the terminal device determines to receive the MBS service on N frequency points, where N is an integer greater than 1.
  • the terminal device determines a frequency point with the highest priority during cell reselection evaluation according to the MBS services respectively provided by the N frequency points.
  • the frequency point with the highest priority may meet at least one of the following conditions: the number of MBS services that can be provided is the largest; the priority of the MBS services that can be provided is the highest; the first MBS service can be provided, and the first MBS service is The MBS service currently being received by the terminal device.
  • the frequency point that can provide the largest number of MBS services may be selected as the frequency point with the highest priority.
  • the priority of the frequency points may be sorted according to the number of MBS services that the terminal equipment is receiving or is interested in receiving at the frequency point. The more the number of MBS services that can be provided on the frequency point, the higher the priority of the frequency point.
  • the frequency point where the MBS service with the highest priority is located may be selected as the frequency point with the highest priority.
  • the priorities of the frequency points may be sorted according to the priorities of the MBS services provided by the frequency points. The higher the priority of the frequency point capable of providing the MBS service, the higher the priority of the frequency point.
  • an implementation manner is that the priority of the MBS service is provided in the USD, or provided in a system message (such as SIB15) for MBS service continuity.
  • the terminal device may select the frequency point where the currently receiving MBS service is located as the highest priority. For example, when a terminal device starts to be interested in a new MBS service during the process of cell reselection, it will give priority to ensuring the continuity of the currently receiving MBS service. service frequency.
  • the terminal device can select any one of the frequency points as the frequency point with the highest priority, or select a frequency point according to preset rules As the frequency point with the highest priority, for example, the preset rule may be the best signal quality and so on.
  • the terminal device can first determine the frequency point that can provide the most MBS services that the terminal device is receiving or is interested in receiving as a high-priority frequency point.
  • the number of MBS services that can be provided by each frequency point is the same, and the frequency point corresponding to the highest MBS service priority is selected as the highest priority; or, the terminal device first determines the frequency point where the MBS service with the highest priority is located as the high priority frequency point, If there are multiple frequency points with the same priority, the frequency point that can provide the most MBS services that the terminal device is receiving or is interested in receiving is selected as the highest priority.
  • the terminal equipment preferentially camps on a frequency point that can provide a larger number of MBS services during the cell reselection process, thereby ensuring the continuity of more MBS services; or, it can give priority to ensuring the highest Continuity of the priority MBS service; or, priority can be given to ensure the continuity of the currently ongoing MBS service.
  • FIG. 9 it is a schematic flowchart of a communication method provided by the present application.
  • the method includes:
  • the terminal device sends first information to the access network device.
  • the access network device receives the first information.
  • the first information includes information for requesting the first SI message and information for requesting the first SIB, where the first SIB is carried in the first SI message, and the first SIB is used to configure the MCCH, for example, the first The SIB may be the SIB carrying MCCH configuration information.
  • the first SIB may be the MBS SIB, or SIB15, etc.
  • the first information may be an SI request message (RRCSystemInfoRequest).
  • the "information for requesting the first SIB" may also be described as "information for requesting the MCCH”.
  • the first SI message may include a first SIB (such as MBS SIB, SIB15, etc.) and at least one second SIB (such as SIB2 to SIB14).
  • a first SIB such as MBS SIB, SIB15, etc.
  • at least one second SIB such as SIB2 to SIB14.
  • the terminal device can only request the SI message. After receiving the request, the access network device does not know whether the request is for the first SIB or other SIBs in the SI message. SIB (such as the second SIB).
  • the first SIB is requested by explicitly indicating that the first SIB is the MBS SIB used to configure the MCCH, that is, the first information includes the information used to request the first SIB, or the first information includes Including information for requesting MCCH, so that the access network device can accurately determine that the purpose of the terminal device sending the first information is to request the first SIB or to request MCCH, so that the access network device can start broadcasting the MCCH in time , the terminal device can obtain the necessary configuration information for receiving the broadcast service in time and start to receive the broadcast data, thereby reducing the receiving delay of the MBS service, avoiding the interruption of the MBS service, and ensuring the continuity of the MBS service.
  • unnecessary signaling overhead caused by the access network device broadcasting the MCCH when the terminal device is actually requesting the second SIB i.e. non-MBS SIB
  • the terminal device that wants to receive the MBS service may send the first SIB to the access network device
  • One piece of information, for example, the first piece of information is sent through random access message 3.
  • the access network device broadcasts the MCCH, where the MCCH carries MBS configuration information.
  • the terminal device receives the MCCH from the access network device.
  • the access network device may further send the first SIB to the terminal device.
  • the access network device may send second information to the terminal device before sending the MCCH, where the second information is used to notify MCCH modification, for example, the second information may be an MCCH modification notification.
  • the terminal device can receive the MCCH in time, so that the continuity of receiving the MBS service by the terminal device can be further improved.
  • the first information Take the first SI message including the first SIB and N second SIBs as an example, where N is an integer greater than 0, and the first information may include the first bit, where the first bit and Corresponding to the first SIB, used to indicate whether to request the first SIB, for example, if the state of the first bit is 0, it may indicate that the terminal device does not request the first SIB; if the state of the first bit is 1, it may indicate that the terminal device The first SIB is requested.
  • the first bit in the first information may be 1.
  • the first information may include a first bit, where the first bit is used to indicate whether to request the MCCH.
  • the first bit in the first information may be 1.
  • the first information may be as follows:
  • the Requested-SI-List field may include information for requesting the first SI message
  • the Spare field may include information for requesting the first SIB or MCCH, that is, the first bit whose state is 1.
  • the first information may further include bits respectively corresponding to the N second SIBs, respectively indicating whether to request the corresponding second SIBs.
  • N bits respectively corresponding to the N second SIBs may also be included in the Spare field.
  • the access network device supporting MBS service chooses to broadcast MCCH on demand due to resource load, signaling overhead, etc.
  • a terminal device residing in a cell wants to receive MBS service
  • the mechanism of On-demand SI requests the access network device to send the first SIB carrying MCCH configuration, so that the access network device can accurately determine that the purpose of the terminal device sending the first information is to request the first SIB or request MCCH, so that The access network device can start broadcasting MCCH in time, and the terminal device can obtain the configuration information necessary for receiving broadcast services and start receiving broadcast data in time, thereby reducing the delay in receiving MBS services, avoiding interruption of MBS services, and ensuring the continuity of broadcast services.
  • it can also avoid unnecessary signaling overhead caused by the access network device broadcasting the MCCH when the on-demand SI request message sent by the terminal device is actually used to request the second SIB, saving resources, especially saving control plane wireless channels resource.
  • An embodiment of the present application provides a communication device.
  • the communication device may be used to implement the terminal device involved in the foregoing embodiments, and the communication device may include the structure shown in FIG. 3 and/or FIG. 4 .
  • An embodiment of the present application provides a communication device.
  • the communication device may be used to implement the access network equipment involved in the foregoing embodiments, and the communication device may include the structure shown in FIG. 3 and/or FIG. 5 .
  • the communication system may include at least one terminal device and at least one access network device, where the terminal device and the access network device in the communication system may execute the method shown in any one of the above method embodiments.
  • the embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a computer, the computer can implement any one of the above-mentioned method embodiments. Processes related to end devices or network devices.
  • the embodiment of the present application also provides a computer program product, which is used to store a computer program.
  • the computer program When the computer program is executed by a computer, the computer can realize any one of the above method embodiments shown in the embodiment and the terminal device. Or network device-related processes.
  • the embodiment of the present application also provides a chip or a chip system, the chip may include a processor, and the processor may be used to call programs or instructions in the memory, and execute any one of the above method embodiments shown in the embodiment and the terminal device Or a process related to the first access network device.
  • the system-on-a-chip may include the chip, and other components such as a memory or a transceiver.
  • An embodiment of the present application further provides a circuit, which can be coupled with a memory, and can be used to execute a procedure related to a terminal device or a network device in any one of the foregoing method embodiments.
  • the system-on-a-chip may include the chip, and other components such as a memory or a transceiver.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions
  • the device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande concerne un procédé et un appareil de communication, destinés à être utilisés pour améliorer la continuité d'un service de diffusion/multidiffusion (MBS). Le procédé consiste à : envoyer des premières informations à un dispositif de réseau d'accès correspondant à une cellule de desserte, les premières informations étant utilisées pour demander des informations de configuration MBS de cellules voisines de la cellule de desserte ; et recevoir des secondes informations en provenance du dispositif de réseau d'accès, les secondes informations comprenant des informations de configuration MBS d'au moins une cellule voisine de la cellule de desserte. Des informations de configuration MBS de cellules voisines sont demandées dans la cellule de desserte, de telle sorte que les informations de configuration MBS des cellules voisines peuvent être obtenues à l'avance, et il n'est pas nécessaire d'obtenir, après resélection vers une nouvelle cellule, des informations de configuration MBS de la cellule, ce qui permet de réduire le retard de resélection de cellule pendant le déplacement, et d'améliorer la continuité du MBS.
PCT/CN2022/114612 2021-09-29 2022-08-24 Procédé et appareil de communication WO2023051114A1 (fr)

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Citations (1)

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INTEL CORPORATION: "Further details on relay reselection", 3GPP DRAFT; R2-2100625, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Electronic Meeting; 20210125 - 20210205, 15 January 2021 (2021-01-15), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051973749 *
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