Abstract: Embodiments of this application disclose a beam time synchronization method, for a terminal device to report, to an access network device, that time synchronization information meets a preset condition. The method in embodiments of this application includes: The terminal device determines the time synchronization information based on a time synchronization value of a first beam and a time synchronization value of a second beam. The second beam is a candidate beam or a previous serving beam, and the first beam is a current serving beam. The terminal device sends indication information to the access network device if the time synchronization information meets the preset condition, where the indication information indicates that the time synchronization information meets the preset condition.

Abstract: This application provides a resource configuration method and apparatus. A multiplexing type between a second functional unit and each of one or more antenna panels of a first functional unit is indicated to an IAB node, so that the IAB node obtains a resource configuration of an MT or a resource configuration of a DU based on the multiplexing type. This helps implement a resource configuration in the IAB node in a case of a plurality of antenna panels.

Abstract: This application provides a beam failure recovery method and an apparatus. The method includes: A terminal device receives configuration information of a cell, where the configuration information of the cell includes M beam failure detection resource groups and M candidate beam resource groups, the M beam failure detection resource groups are in a one-to-one correspondence with the M candidate beam resource groups, and M is an integer. When M is an integer greater than 1, and a beam failure occurs in at least one of the M beam failure detection resource groups, the terminal device sends, by using a first media access control control element (MAC CE), beam failure recovery information corresponding to the cell. According to the beam failure recovery method provided in this application, beam failure recovery can be performed in time.

Abstract: This application provides a power control parameter determining method and an apparatus, to simplify a beam indication process and a power control parameter indication process, and reduce signaling overheads. The method and apparatus may be applied to a 5G communication system and a future communication system. The method includes: A terminal device receives, from a network device, first signaling that includes a first value of a DCI field, where the first value indicates a first TCI state in at least one activated TCI state; and obtains, based on a mapping relationship, a power control parameter set corresponding to the first TCI state. The mapping relationship includes a mapping relationship between an identifier of at least one mapping parameter subset and at least one value of the DCI field, or a mapping relationship between an identifier of at least one mapping parameter subset and the at least one activated TCI state.

Abstract: A communication method and apparatus.

Abstract: This application provides a wireless communication method and apparatus. The wireless communication method includes: receiving indication information of a first pattern, where the first pattern is one of a plurality of patterns, each of the plurality of patterns indicates distribution of at least one resource in frequency domain, and the at least one resource includes at least one of a first resource, a second resource, and a third resource, where the first resource is a definitely available resource, the second resource is an unavailable resource, and availability of the third resource depends on a further indication of an upper-level node; and communicating with a second network device and/or a terminal device based on the first pattern.

Abstract: This application discloses a channel measurement method and apparatus. A network device sends downlink signaling, to indicate or activate a beam. A terminal device determines the beam indicated or activated by using the downlink signaling, determines, based on an association relationship between a beam and a channel measurement configuration, a channel measurement configuration associated with the beam, performs channel measurement based on the channel measurement configuration, to obtain a channel measurement result, and reports the channel measurement result to the network device. According to the channel measurement solution in this application, when channel quality of a new beam needs to be measured, the network device does not need dedicated signaling to indicate a channel measurement configuration associated with the new beam. When the beam is indicated or activated, the terminal device is triggered to perform channel measurement, to implement low-latency and low-overhead channel measurement.

Abstract: This application provides a method for reporting a measurement result of interference measurement, to implement interference management performed by a parent node on a child node in an IAB system. The method includes: performing, by a second node, interference measurement to obtain one or more measurement results, the interference measurement includes interference measurement in a first mode and/or interference measurement in a second mode, and sending, by the second node, an uplink signal to the first node, the uplink signal includes the one or more measurement results, the uplink signal includes an indication field, and the indication field is used to indicate a mode of interference measurement corresponding to each of the one or more measurement results.

Abstract: An IAB node reports first information to a donor node of the IAB node, where the first information indicates a first condition, and the first condition is a condition under which an MT of the IAB node and a DU of the IAB node work synchronously; and under the first condition, the DU of the IAB node communicates with a lower-level node of the IAB node or a terminal device, and synchronously, the MT of the IAB node communicates with an upper-level node of the IAB node.

Abstract: A transmission timing determining method and apparatus are provided, to determine a transmission timing of an IAB node. The method is applied to a first node, and a second node may be an upper-level node or a donor node of the first node. The method includes: The first node receives control information from the second node, where the control information includes scheduling information of uplink transmission, and the control information includes first scrambling information. The first node determines a first timing type associated with the first scrambling information. The first node determines a transmission timing of the uplink transmission based on the first timing type.

Abstract: Embodiments of this application provide a beam management method and an apparatus, to efficiently notify a beam, avoid a complex and redundant indication instruction, and reduce signaling overheads. The method includes: A terminal device receives beam configuration information from a network device, where the beam configuration information includes configuration information of one or more common beams, and the one or more common beams include any one of the following: a separate common beam used for uplink transmission or downlink transmission and a joint common beam used for uplink transmission and downlink transmission. The terminal device receives beam activation information from the network device, where the beam activation information is used to activate some of the one or more common beams. The terminal device receives beam indication information from the network device, where the beam indication information indicates one or more of the some common beams.

Abstract: A method for sending a synchronization signal in a relay system, and the method includes receiving, by a relay node, synchronization signal information sent by a parent node through an air interface, where the synchronization signal information comprises at least one of a subcarrier spacing of a synchronization signal, information about an operating frequency band of the relay node, information about a physical broadcast channel of the relay node, a synchronization signal periodicity, or indication information of a synchronization signal obtaining manner, and sending, by the relay node, the synchronization signal based on the synchronization signal information.

Abstract: A cell handover method and an apparatus. Indication information is received from a source cell, where the indication information indicates to a first transmission configuration indicator TCI state and cell handover; initiating random access to a target cell according to the indication information. In response to first response information returned by the target cell being received, second response information is returned to the source cell, where the second response information indicates that the first TCI state is successfully activated. Cell handover is implemented through beam switch to reduce a delay of a terminal device during the cell handover. The terminal device returns the second response information to the source cell only after receiving the first response information returned by the target cell.

Abstract: This application provides a beam failure recovery method, an apparatus, and a system. In this solution, a terminal device receives first configuration information from a network device, and performs cell-level beam failure recovery or transmission reception point level (TRP-level) beam failure recovery based on the first configuration information. The first configuration information is used to configure a plurality of sets of beam failure detection resources and a plurality of sets of candidate beam resources. Based on this solution, the terminal device may perform partial beam failure recovery based on the plurality of sets of beam failure detection resources and the plurality of sets of candidate beam resources, so that the terminal device can detect a TRP-level beam failure and recover the TRP-level beam failure in time. This effectively improves smooth system evolution.

Abstract: This application provides a resource configuration method and apparatus. A multiplexing type between a second functional unit and each of one or more antenna panels of a first functional unit is indicated to an IAB node, so that the IAB node obtains a resource configuration of an MT or a resource configuration of a DU based on the multiplexing type. This helps implement a resource configuration in the IAB node in a case of a plurality of antenna panels.

Abstract: This application provides a flow control method and apparatus, and relates to the field of communications technologies. A relay device indicates flow control to an upper-level node to avoid spectrum resources waste because of excessively small amount of data transmission or an excessively large amount of data transmission from an upper-level node. The method includes: A first node determines to indicate a second node to perform flow control; and the first node sends a first flow control indication to the second node. The first flow control indication is carried in adaptation layer control signaling, an RLC control message, or a MAC CE. The first flow control indication includes identifiers of one or more bearers and flow control information. The second node is a relay node or a donor base station.

Abstract: This application provides a communication method and apparatus, to expect to better implement spatial multiplexing of an access link and a backhaul link of an IAB node. The method is applied to an MT of the IAB node. The method includes: obtaining transmission resource configurations, where the transmission resource configurations include a first configuration and a second configuration, the first configuration indicates that a start time domain resource is a downlink time domain resource and/or an end time domain resource is an uplink time domain resource in one configuration period, and the second configuration indicates that a start time domain resource is an uplink time domain resource and/or an end time domain resource is a downlink time domain resource in one configuration period; and determining, according to a specified rule.

Abstract: This application provides a wireless communication method. The method includes: receiving first information, where the first information is for configuring a parameter of a first beam set, the first beam set includes at least one first beam, and the first beam is a beam shared by a plurality of channels and/or a plurality of reference signals; receiving second information, and determining information about a first beam subset based on the second information, where the first beam subset belongs to the first beam set; and receiving third information, and determining information about the first beam based on the third information, where the first beam belongs to the first beam subset, and the first beam is a common beam. In this application, beams of all channels/reference signals can be uniformly indicated by configuring, activating, and indicating a common beam. This simplifies implementation and reduces signaling overheads.

Abstract: Embodiments of this application disclose a beam-based communication method. The method includes: receiving configuration information of a physical downlink control channel (PDCCH) from a network device, wherein the PDCCH is corresponding to a control resource set 0 (CORESET0); receiving indication information from the network device, wherein the indication information indicates a first beam; where the configuration information of the PDCCH includes a first parameter, the first parameter indicates that the PDCCH uses the first beam; and receiving the PDCCH by using the first beam.

Abstract: Embodiments of this application disclose a communication method and an apparatus, and relate to the communication field, to support a terminal device in performing beam failure detection in a common beam scenario. The method includes: A terminal device receives a first transmission configuration indicator (TCI) from an access network device, where the TCI may indicate a common beam. For example, the first TCI includes information about a first uplink reference signal and/or information about a first downlink reference signal, a spatial transmission filter corresponding to the first uplink reference signal is used for sending a plurality of uplink channels, and the first downlink reference signal and demodulation reference signals DMRSs of a plurality of downlink channels meet a quasi co-location QCL relationship.