Abstract: Embodiments of the present invention disclose a link re-establishment method and a device, and relate to the communications field: When detecting that a first downlink beam pair set is invalid, UE sends a first uplink signal to a base station at a moment n by using a first uplink beam pair set through a first uplink channel, where the first uplink signal is used to notify the base station that the first downlink beam pair set is invalid; and the UE detects, at a moment n+k, a first downlink signal sent by the base station by using a second downlink beam pair set through a first downlink channel.

Abstract: The present disclosure discloses an example signal transmission method and an example terminal device. One example signal transmission method includes monitoring, by a terminal device and based on a size of first downlink control information (DCI), the first DCI and second DCI that are sent by a network device, where the first DCI is carried on a power saving signal shared by a plurality of terminal devices including the terminal device, and the second DCI is carried on a terminal device specific power saving signal. It is determined by the terminal device and based on at least one of the first DCI or the second DCI, whether to monitor a data channel in a first time period.

Abstract: A downlink control channel monitoring method includes determining a first search space (SS) set and a second SS set. The method also includes determining, based on a first priority of the first SS set and a second priority of the second SS set, whether to monitor a first physical downlink control channel (PDCCH) on a first downlink control channel candidate resource of the first SS set, and whether to monitor a second PDCCH on a second downlink control channel candidate resource of the second SS set. The first priority of the first SS set is equal to the second priority of the second SS set.

Abstract: A method, an apparatus, a UE, and a base station for transmitting a HARQ-ACK are disclosed. The method includes: determining a channel for transmitting a HARQ-ACK; determining a HARQ-ACK feedback bit; and sending the HARQ-ACK feedback bit on the channel. According to this application, transmission of a HARQ-ACK between a UE and a base station can be implemented in a scenario where carrier aggregation is performed between base stations having a non-ideal backhaul.

Abstract: Example resource allocation methods and apparatus are described to resolve a problem of resource congestion and collision occurring in a communications system when virtual resource blocks (VRBs) scheduled for different terminal devices are mapped to physical resource blocks (PRBs). In one example method, system bandwidth of the communications system is divided into a plurality of fixed interleaving regions. Therefore, a network device can indicate a type of a virtual resource unit in a form of a frequency domain range occupied by one interleaving region. Using the foregoing solution can enable the network device to set the type of the virtual resource unit more conveniently.

Abstract: Embodiments of the present invention provide a detecting method, a transmitting method and an apparatus for a common control channel. The detecting method includes: determining a candidate resource set within virtual downlink resources of a current cell. The candidate resource set can include at least one candidate resource carrying a common control channel of the current cell. A detection is performed on at least one candidate resource in the candidate resource set, so as to acquire the common control channel of the current cell. In the embodiments of the present invention, a selection range of resources for transmitting a common control channel is extended, so that inter-cell interference of the common control channel can be coordinated, and a detection performance of the common control channel can be improved.

Abstract: Embodiments provide resource scheduling method, user equipment, and an access network device. The method includes: receiving, by user equipment over a first control channel, first indication information corresponding to a transport block, where time-frequency resources occupied by a data channel in which the transport block is located include a first resource set and a second resource set, and the first indication information is used to indicate the first resource set and a time-frequency resource of a second control channel; receiving, by the user equipment, second indication information over the second control channel, where the second indication information is used to indicate the second resource set; and determining, by the user equipment, the transport block based on the first resource set and the second resource set. This can reduce control signaling overheads and improve flexibility of control channel resource scheduling.

Abstract: A communication method includes receiving monitoring information, where the monitoring information comprises information of a search space set corresponding to a wake-up signal (WUS); determining at least one of a monitoring periodicity of the WUS or a monitoring occasion in the monitoring periodicity based on the information of the search space set; receiving the WUS from the network device, where the WUS comprises wake-up information of at least one terminal device; and performing PDCCH monitoring based on wake-up information of the terminal device in on duration of at least one discontinuous reception DRX cycle corresponding to the WUS, where the wake-up information of at least one terminal device comprises the wake-up information of the terminal device.

Abstract: This application provides a wireless communication method, a terminal device, and a network device. The wireless communication method includes: A terminal device selects, based on a first parameter, a value set from a first value set and a second value set that are of slot offsets and that are configured by a network device, wherein all slot offsets in the first value set are greater than a first threshold, and at least one slot offset in the second value set is equal to the first threshold; and receive DCI, wherein a slot offset carried in the DCI belongs to the selected value set, and the slot offset is used to indicate an offset in a quantity of slots of a PDSCH scheduled by the DCI relative to the DCI. According to the technical solutions in this application, the different value sets correspond to different data channel scheduling mechanisms.

Abstract: The present invention discloses a carrier switching method, a base station, and user equipment, where the method includes: determining, according to carrier switching capability information of user equipment UE, a carrier switching policy according to which the UE performs carrier switching; and sending carrier switching indication information to the UE, where the carrier switching indication information is used for indicating the carrier switching policy, so that the UE performs carrier switching according to the carrier switching policy. In the carrier switching method, the base station and the user equipment according to embodiments of the present invention, the UE having no carrier aggregation capability is enabled to dynamically perform switching between at least two carriers, so that quality of service of a service of the UE can be improved, user experience can be improved, and system performance can be improved.

Abstract: Example methods and apparatus for sending an uplink control channel and receiving an uplink control channel are described. One example method for sending an uplink control channel includes determining a resource set to be used for an uplink control channel by a terminal device, where the uplink control channel carries uplink control information and a demodulation reference signal (DMRS). The resource set includes N resource subsets, each of the N resource subsets includes a plurality of consecutive symbols in time domain, and N is greater than or equal to 1. The terminal device determines, for each of the N resource subsets, a quantity of symbols used to carry the DMRS, where the quantity of symbols is one of at least two candidate symbol quantities. The terminal device sends the uplink control channel by using the resource set.

Abstract: The present disclosure relates to information sending methods and devices. One example method includes determining, by a network device, a physical downlink control channel, where the physical downlink control channel includes at least one control channel element (CCE), the at least one CCE is mapped to a resource element group (REG) bundle set, the REG bundle set includes N REG clusters that are discrete in frequency domain, each REG cluster includes a plurality of consecutive physical resource blocks in frequency domain, N is less than M, M is a quantity of REG clusters included in a control resource set, and both N and M are positive integers, and sending, by the network device, downlink control information by using the physical downlink control channel.

Abstract: A communication method and a communications device are provided, to improve flexibility of transmitting a physical uplink shared channel resource. In at least some embodiments, first indication information is generated by a network device, where the first indication information is used to indicate one or more frequency hopping bandwidths used by a terminal device to send a physical uplink shared channel resource to the network device. The first indication information is sent by the network device to the terminal device. The methods provided in the embodiments may be applied to a communications system, e.g., vehicle to everything (V2X), vehicle-to-vehicle (V2V), internet of vehicles (IoV), to improve an autonomous driving capability of a vehicle.

Abstract: This application provides a reference signal receiving method, a reference signal sending method, and an apparatus. The reference signal receiving method includes: when a terminal device is out of a first time period, detecting, by the terminal device, a first signal, and determining, based on a detection result of the first signal, whether to use a first reference signal to perform time-frequency tracking and/or channel measurement; and receiving, by the terminal device, a second reference signal when the terminal device is in the first time period, where the first reference signal and the second reference signal are reference signals used for time-frequency tracking and/or channel measurement.

Abstract: Embodiments of this application provide a control channel configuration method, a base station, and a terminal device. The method includes: determining, by a base station, a configuration of a time-frequency resource unit from at least two configurations of a time-frequency resource unit of a control channel; and sending, by the base station, indication information to a terminal device, where the indication information is used to indicate the configuration of the time-frequency resource unit, and the at least two configurations of a time-frequency resource unit include a first configuration and a second configuration. In the embodiments of this application, the base station can flexibly configure the time-frequency resource unit of the control channel. In addition, flexibly configuring a time-frequency resource unit can reduce a probability that time-frequency resource units of different structures are blocked, thereby reducing complexity of detecting the control channel by the terminal device.

Abstract: In a method and apparatus for determining a search space, a control resource set of a terminal device is corresponding to at least two aggregation levels. The at least two aggregation levels include a maximum aggregation level and a first aggregation level, the first aggregation level is less than the maximum aggregation level, and the maximum aggregation level is the highest aggregation level of the at least two aggregation levels. Based on the method and the apparatus, a first search space corresponding to the first aggregation level is determined based on a quantity of control channel elements (CCEs) included in the control resource set of the terminal device and the maximum aggregation level.

Abstract: Embodiment of this application provide methods and apparatuses for communicating downlink control information. One method includes: dividing, by a terminal device, target resources into M resource subsets; determining, by the terminal device, a resource set from the M resource subsets, wherein the resource set consists of N control channel bearing resource units, N?2, at least two of the N control channel bearing resource units belong to different resource subsets of the M resource subsets, and at least two of the N control channel bearing resource units are not consecutive in the frequency domain, wherein each of the N control channel bearing resource units includes at least two resource element groups (REGs) that are consecutive in the frequency domain, and wherein each REG of the at least two REGs comprises a plurality of resource elements (REs); and receiving, by the terminal device, downlink control information on the resource set.

Abstract: Embodiments of the present invention provide a resource mapping method and an apparatus, and relate the communications field, so as to flexibly implement resource mapping of a channel or a signal. First information is obtained. The first information is used to indicate a cyclic shift start resource block location or a cyclic shift end resource block location for resource mapping of a first channel or a first signal in a resource block cyclic shift manner in a bandwidth used by user equipment. A resource mapping location of the first channel or the first signal in the bandwidth used by the user equipment is determined according to the resource block cyclic shift manner and the first information. The first channel or the first signal is received or sent at the resource mapping location. The resource mapping method and the apparatus are used to map a resource.

Abstract: This application discloses a message sending method, a message receiving method, an apparatus, and a device. The message sending method includes: A network device sends, by using a physical downlink control channel PDCCH, DCI with s a cyclic redundancy check CRC bit, wherein the DCI is in a first DCI format or a second DCI format, wherein the DCI is used to indicate a terminal device to enter a sleep mode at a first moment. The network device receives a response message that is sent by the terminal device based on the DCI.

Abstract: A communications method and apparatus are provided. The method includes: determining one or more occasions on which a first channel is sent; and sending the first channel on the one or more occasions to at least one terminal device The first channel carries first information. The first information includes one or more information blocks. Each information block corresponds to one of the at least one terminal device. Each information block corresponds to a different terminal device. Each information block includes one first information field set. The first information field set is used to indicate information about detection performed on a second channel by a terminal device corresponding to an information block in which the first information field set is located.