Abstract: This application relates to the field of communications technologies, and discloses a bandwidth indication method and apparatus, to provide a solution of indicating, by a base station, an allocated bandwidth part to a terminal when the terminal does not know a carrier bandwidth. The method is: determining, by the base station, a virtual bandwidth allocated to the terminal, where the virtual bandwidth is a part of a carrier bandwidth, and a bandwidth allocated to the terminal falls within the virtual bandwidth; and sending, by the base station, position information of the virtual bandwidth to the terminal, where the position information is used to indicate a position of the virtual bandwidth.

Abstract: A power control method includes determining priorities of uplink transmission and sidelink transmission, where the uplink transmission is used to transmit uplink information by a first terminal device to a network device, and the sidelink transmission is used to transmit sidelink information by the first terminal device to a second terminal device; determining target information that is in the sidelink information and that overlaps with the uplink information in time domain in a scheduling time unit; determining transmit powers of the uplink information and the target information based on the target information and the priorities of the uplink transmission and the sidelink transmission; and sending the uplink information based on the transmit power of the uplink information, or sending the target information based on the transmit power of the target information.

Abstract: A communication method and an apparatus are provided. An example method includes: receiving initially transmitted first data in a first cell based on a correspondence between the first cell and a first hybrid automatic repeat request (HARQ) entity; receiving first indication information, wherein the first indication information indicates a correspondence between a second cell and the first HARQ entity; and receiving retransmitted first data in the second cell based on the correspondence between the second cell and the first HARQ entity.

Abstract: A communication method and a communications apparatus are provided. The method includes: sending, by a network device, indication information to a terminal, where the indication information is used to indicate at least one second BP associated with a first BP; and performing signal transmission, by the network device, with the terminal on the first BP and the at least one second BP. It may be learned that the network device indicates, to the terminal by using the indication information, the at least one second BP associated with the first BP, so that the network device and the terminal can transmit signals on BPs that are associated with each other. In addition, there may be a plurality of second BPs associated with the first BP.

Abstract: A resource indication method, a device, and a system relate to the field of communications technologies. The method includes: allocating, by a base station, a BP to a terminal device, and sending, to the terminal device, a first message indicating a resource position of the BP; and receiving, by the terminal device, the first message sent by the base station, and then determining the resource position of the BP based on resource position information of at least one sub-BP, where the BP includes the at least one sub-BP, the BP is not greater than a maximum bandwidth supported by the terminal device, and the first message includes the resource position information of the at least one sub-BP. The BP is allocated by using a sub-BP as a granularity, so that signaling overheads can be reduced while a requirement for more flexible resource allocation is satisfied.

Abstract: This application provides a communication method and apparatus. The method includes: A terminal receives first configuration information from a network device, and determines a time unit aggregation based on the first configuration information, where the time unit aggregation includes at least one time unit. The terminal receives control information from the network device, and determines at least one first time subunit and at least one second time subunit in the time unit aggregation based on the control information. The terminal receives, in the at least one first time subunit, data corresponding to a first transport block, and receives, in the at least one second time subunit, data corresponding to a second transport block.

Abstract: This application provides a communication method and apparatus. The method includes: A terminal receives first control information, where the first control information is used to trigger a channel state information (CSI) operation corresponding to a first secondary component carrier, the first secondary component carrier is in a deactivated state, and the CSI operation includes one or more of the following: aperiodic CSI reporting, aperiodic CSI measurement, semi-persistent CSI reporting, or semi-persistent CSI measurement. The terminal performs, based on the first control information, the CSI operation corresponding to the first secondary component carrier.

Abstract: Disclosed are a communication method and an apparatus. The method includes: when a first terminal device supports sending of an uplink signal and a sidelink signal in a first time unit on a first carrier, determining, by the first terminal device based on priorities of the uplink signal and the sidelink signal, a first transmit power of the uplink signal and a second transmit power of the sidelink signal; and sending, by the first terminal device, the uplink signal based on the first transmit power, and/or sending the sidelink signal based on the second transmit power.

Abstract: This application discloses a resource configuration method, a method for determining a bandwidth part, a method for indicating a bandwidth part, and a device. The method for indicating a bandwidth part includes: determining, by a base station, the bandwidth part based on a mapping relationship between a first carrier bandwidth and a first bandwidth part set and/or a mapping relationship between a capability bandwidth of a terminal device and a second bandwidth part set, where the first bandwidth part set includes a plurality of bandwidth parts, the first bandwidth part set includes the bandwidth part, the second bandwidth part set includes a plurality of bandwidth parts, and the second bandwidth part set includes the bandwidth part; and indicating, by the base station, the bandwidth part to the terminal device.

Abstract: An apparatus includes a communications interface, a non-transitory memory storage including non-transitory computer-executable instructions, and one or more processors in communication with the communications interface and the non-transitory memory storage. The one or more processors are configured to execute the non-transitory computer-executable instructions to cause the apparatus to perform operations including performing sidelink communication in a first carrier bandwidth part (BWP) in a first time unit. A first frame structure numerology is useable for the sidelink communication in the first time unit. The first frame structure numerology is the same as a frame structure numerology of a common BWP. The first BWP is the common BWP or a first dedicated BWP. A frame structure numerology of the first dedicated BWP is the same as the frame structure numerology of the common BWP. Bandwidth of the first dedicated BWP includes bandwidth of the common BWP.

Abstract: This application provides example sidelink resource configuration methods and apparatuses. One example method includes receiving, by a first terminal, first configuration information of a sidelink resource, where the sidelink resource configured by using the first configuration information includes a common resource in resource pools or sidelink bandwidth part BWP resources of N terminals in a terminal group, the terminal group includes the first terminal, and N is a positive integer. The first terminal can then perform sidelink communication with a terminal in the terminal group on the sidelink resource.

Abstract: A communications method and apparatus are provided. The method includes: receiving first configuration information, where the first configuration information is used to configure a first bandwidth part (BWP); and sending sidelink data on a resource included in a first transmission resource pool, where a frequency range of the first transmission resource pool is included in a frequency range of the first BWP and a frequency range of a second BWP, and the second BWP is an activated uplink BWP. The communications method and apparatus in this application can implement terminal device communication on the first BWP and the second BWP, and reduce a time of switching between the first BWP and the second BWP, thereby improving efficiency of the communication on the first BWP and the second BWP.

Abstract: Embodiments of this application provide a communication method, a communications apparatus, and a communications system, to determine a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) is inconsistent with a center frequency of a carrier. The method includes: receiving, by a terminal, an SS from a network device; determining, by the terminal, a first PRB grid based on the SS; receiving, by the terminal, first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first PRB grid and a second PRB grid; and determining, by the terminal, the second PRB grid based on the first PRB grid and the first frequency offset.

Abstract: Embodiments of this application provide a communications method and apparatus. The method includes: receiving, by a first terminal device, first information sent by a network device, where the first information is used to configure a BWP set; the BWP set includes a first BWP and a second BWP; and the first BWP is used for communication between the first terminal device and the network device, and the second BWP is used for communication between the first terminal device and a second terminal device; and communicating, by the first terminal device, on at least one first BWP and/or at least one second BWP in the BWP set. The foregoing method provides a BWP configuration idea and method, so that the first terminal device can communicate on the first BWP and the second BWP at the same time.

Abstract: This application provides a data transmission method and a related apparatus. The method includes determining, by a first node, a transmission periodicity, where the transmission periodicity includes a first time unit and a second time unit. In the transmission periodicity, data of a first service is transmitted in only the first time unit, and a physical signal is transmitted in the second time unit. The method further includes transmitting, by the first node, the data of the first service in the first time unit, and/or transmitting the physical signal in the second time unit.

Abstract: A method, system, and device to obtain a basic subcarrier spacing, or a channel bandwidth, or a maximum transmission bandwidth, or a usable subcarrier spacing set via a predefined mapping rule is provided. In an embodiment, a method in a network component to determine a system numerology includes determining, by the network component, one or more subcarrier spacing options from a candidate subcarrier spacing set that is associated with a carrier frequency band. The method also includes transmitting, by the network component, a signal indicating to one or more UEs one or more subcarrier spacing options from the candidate subcarrier spacing set.

Abstract: Embodiments of this application provide a communication method, a communications apparatus, and a communications system, to determine a physical resource block (PRB) grid when a center frequency of a synchronization signal (SS) is inconsistent with a center frequency of a carrier. The method includes: receiving, by a terminal, an SS from a network device; determining, by the terminal, a first PRB grid based on the SS; receiving, by the terminal, first indication information from the network device, where the first indication information is used to indicate a first frequency offset between the first PRB grid and a second PRB grid; and determining, by the terminal, the second PRB grid based on the first PRB grid and the first frequency offset.

Abstract: This application provides a sidelink resource configuration method and apparatus. The method includes: configuring, by a network device, sidelink bandwidth part (SL BWP) configuration information for a terminal device, where the SL BWP configuration information is used to indicate a common first parameter of M resource pools in the SL BWP; and configuring, by the terminal device, the M resource pools in the SL BWP based on the SL BWP configuration information in a process of configuring the resource pools in the SL BWP, where the M resource pools have at least one same parameter, and the at least one parameter is determined based on the first parameter. Therefore, communication between different terminal devices can be implemented by configuring the resource pools in the SL BWP.

Abstract: This application provides a method for deactivating a carrier and an apparatus. The method includes: A terminal receives first information, where the first information indicates a default bandwidth part (BWP). The terminal deactivates a secondary carrier based on the default BWP. According to the provided embodiments, the secondary carrier is deactivated by using physical layer control information for activating or deactivating a BWP.

Abstract: A signal transmission method and an apparatus are provided. The signal transmission method includes receiving a first message in an active first carrier bandwidth part BWP, and then determining, based on the first message, that a new active BWP of a terminal device is a second BWP, where the second BWP is a BWP in one or more to-be-activated BWPs of the terminal device, and then transmitting a signal in the second BWP. In embodiments of this application, the one or more to-be-activated BWPs is configured, where the to-be-activated BWP is a state configured by a network device for the terminal device. In addition to the first BWP in an active state, the second BWP in a to-be-activated state further exists at the same moment.