TECHNICAL FIELD

This application relates to the field of wireless communication technologies, and in particular, to a communication method and a communications apparatus.

BACKGROUND

In a wireless communications system, a terminal and a network transmit data to each other based on radio communication technologies. However, before the data is transmitted, the terminal usually needs to first access the network, to establish a connection to the network.

Generally, the connection between the terminal and the network may be denoted as a link for short. Two endpoints of a link are respectively used to represent two devices that respectively receive and send data. One endpoint represents a device that enjoys a network service, such as a terminal. The other endpoint represents a device that provides the network service, such as a base station. A connection line between the two endpoints is used to represent a path of data transmission. Links are further classified into an uplink (UL) and a downlink (DL) based on a direction of data transmission.

For data transmission between the terminal and the network, both the uplink and the downlink between the terminal and the network are essential. In addition, to ensure validity and reliability of data transmission, the uplink and the downlink further need to cooperate with each other. For example, in data retransmission, the terminal receives data in the downlink, and if the terminal detects that data transmission fails, the terminal needs to feed back, in the uplink cooperating with the downlink, that a transmission status of the data is “failure”, to trigger the base station to retransmit the data. Correspondingly, after sending data in the downlink, the base station also needs to monitor a feedback of the terminal in the uplink cooperating with the downlink. Such cooperation between the uplink and the downlink is usually long-term and fixed, and is also referred to as “paired” or “coupled”. In this case, the connection between the terminal and the network may be understood as the paired uplink and downlink.

In a 5G new radio (NR) system under discussion, maximum bandwidth of a carrier may be 400 MHz, but a maximum bandwidth capability supported by the terminal may not reach such wide bandwidth. When the terminal does not support a bandwidth capability of a carrier, the base station cannot directly allocate a resource to the terminal within a range of carrier bandwidth as in a long term evolution (LTE) system, but first configures one or more bandwidth parts (BP) for the terminal on the carrier, and then allocates a resource to the terminal within a range of the BP. In NR, the base station may configure a plurality of uplink BPs and a plurality of downlink BPs for the terminal. When data transmission needs to be performed, the base station activates some or all of the uplink BPs configured for the terminal, and activates some or all of the downlink BPs configured for the terminal, for data transmission on the activated uplink BPs and downlink BPs.

SUMMARY

This application provides a communication method, to resolve a problem of association between an uplink BP and a downlink BP.

According to a first aspect, this application provides a communication method, and the communication 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.

In this way, 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. This can effectively improve spectrum resource utilization.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; and the sending, by a network device, indication information to a terminal includes: sending, by the network device, the indication information to the terminal on the first BP.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; and the performing signal transmission, by the network device, with the terminal on the first BP and the at least one second BP includes: receiving, by the network device, uplink data that is sent by the terminal on the at least one second BP corresponding to an uplink scheduling grant in the first BP.

In a possible design, the first BP is an uplink BP, and the second BP is a downlink BP; and the performing signal transmission, by the network device, with the terminal on the first BP and the at least one second BP includes: receiving, by the network device on the first BP, at least one piece of HARQ feedback information sent by the terminal, where the HARQ feedback information corresponds to a HARQ of the at least one second BP.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; or the first BP is an uplink BP, and the second BP is a downlink BP.

In a possible design, the first BP and the at least one second BP belong to a same cell.

In a possible design, the method is applied to at least a TDD system and an FDD system.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; and the method further includes: receiving, by the network device, an SRS sent by the terminal on an uplink measurement BP, where the uplink measurement BP is obtained based on the at least one second BP; and obtaining, by the network device, channel quality of the first BP based on the SRS.

According to a second aspect, this application provides a communication method, and the communication method includes: receiving, by a terminal, indication information sent by a network device, where the indication information is used to indicate at least one second BP associated with a first BP; and performing signal transmission, by the terminal, with the network device on the first BP and the at least one second BP.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; and the receiving, by a terminal, indication information sent by a network device includes: receiving, by the terminal on the first BP, the indication information sent by the network device.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; and the performing signal transmission, by the terminal, with the network device on the first BP and the at least one second BP includes: sending, by the terminal, uplink data to the network device on the at least one second BP corresponding to an uplink scheduling grant in the first BP.

In a possible design, the first BP is an uplink BP, and the second BP is a downlink BP; and the performing signal transmission, by the terminal, with the network device on the first BP and the at least one second BP includes: sending, by the terminal on the first BP, at least one piece of HARQ feedback information to the network device, where the HARQ feedback information corresponds to a HARQ of the at least one second BP.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; or the first BP is an uplink BP, and the second BP is a downlink BP.

In a possible design, the first BP and the at least one second BP belong to a same cell.

In a possible design, the method is applied to at least a time division duplex TDD system and a frequency division duplex FDD system.

In a possible design, the first BP is a downlink BP, and the second BP is an uplink BP; and the method further includes: sending, by the terminal, an SRS on an uplink measurement BP, where the uplink measurement BP is obtained based on the at least one second BP.

This application further provides a communication method, and the communication method includes: receiving, by a terminal, configuration information from a network device, where the configuration information is used to configure a first frequency domain resource and a frequency domain resource associated with the first frequency domain resource, the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource have a same center frequency, and the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource are in different transmission directions; and determining, by the terminal based on the configuration information, the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource.

In a possible design, the method further includes: receiving, by the terminal, first instruction information from the network device, where the first instruction information is used to instruct to activate the first frequency domain resource; and activating, by the terminal, the first frequency domain resource according to the first instruction information.

In a possible design, after the receiving, by the terminal, first instruction information from the network device, the method further includes: deactivating, by the terminal, a third frequency domain resource, where the third frequency domain resource and the first frequency domain resource are in a same transmission direction, and the third frequency domain resource and the first frequency domain resource have a same center frequency.

In a possible design, after the receiving, by the terminal, first instruction information from the network device, the method further includes: activating, by the terminal, the frequency domain resource associated with the first frequency domain resource, and deactivating a third frequency domain resource and a fourth frequency domain resource; where the third frequency domain resource and the first frequency domain resource are in a same transmission direction, and the third frequency domain resource and the first frequency domain resource have different center frequencies; and the third frequency domain resource and the fourth frequency domain resource are in different transmission directions, and the third frequency domain resource and the fourth frequency domain resource have a same center frequency.

In a possible design, a plurality of frequency domain resources are associated with the first frequency domain resource; and the activating, by the terminal, the frequency domain resource associated with the first frequency domain resource includes: receiving, by the terminal, second instruction information sent by the network device, where the second instruction information is used to instruct to activate a second frequency domain resource, and the second frequency domain resource is any one of the frequency domain resources associated with the first frequency domain resource; and activating, by the terminal, the second frequency domain resource according to the second instruction information.

In a possible design, the method further includes: activating, by the terminal based on the configuration information, the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource.

This application further provides a communication method, and the method includes: generating, by a network device, configuration information; and sending, by the network device, the configuration information to a terminal, where the configuration information is used to configure a first frequency domain resource and a frequency domain resource associated with the first frequency domain resource, the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource have a same center frequency, and the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource are in different transmission directions.

In a possible design, the method further includes: sending, by the network device, first instruction information to the terminal, where the first instruction information is used to instruct to activate the first frequency domain resource.

In a possible design, a plurality of frequency domain resources are associated with the first frequency domain resource; and the method further includes: sending, by the network device, second instruction information to the terminal, where the second instruction information is used to instruct to activate a second frequency domain resource, and the second frequency domain resource is any one of the frequency domain resources associated with the first frequency domain resource.

This application further provides a communication method, and the communication method includes: receiving, by a terminal, configuration information from a network device, where the configuration information is used to configure at least one frequency domain resource and a frequency domain resource associated with any frequency domain resource in the at least one frequency domain resource, the any frequency domain resource and the frequency domain resource associated with the any frequency domain resource have a same center frequency, and the any frequency domain resource and the frequency domain resource associated with the any frequency domain resource are in different transmission directions; and determining, by the terminal based on the configuration information, the at least one frequency domain resource and the frequency domain resource associated with the any frequency domain resource in the at least one frequency domain resource.

In a possible design, the method further includes: receiving, by the terminal, first instruction information from the network device, where the first instruction information is used to instruct to activate a first frequency domain resource, and the first frequency domain resource is any one of the at least one frequency domain resource; and activating, by the terminal, the first frequency domain resource according to the first instruction information.

In a possible design, after the receiving, by the terminal, first instruction information from the network device, the method further includes: deactivating, by the terminal, a third frequency domain resource, where the third frequency domain resource and the first frequency domain resource are in a same transmission direction, and the third frequency domain resource and the first frequency domain resource have a same center frequency.

In a possible design, after the receiving, by the terminal, first instruction information from the network device, the method further includes: activating, by the terminal, a frequency domain resource associated with the first frequency domain resource, and deactivating a third frequency domain resource and a fourth frequency domain resource; where the third frequency domain resource and the first frequency domain resource are in a same transmission direction, and the third frequency domain resource and the first frequency domain resource have different center frequencies; and the third frequency domain resource and the fourth frequency domain resource are in different transmission directions, and the third frequency domain resource and the fourth frequency domain resource have a same center frequency.

In a possible design, a plurality of frequency domain resources are associated with the first frequency domain resource; and the activating, by the terminal, a frequency domain resource associated with the first frequency domain resource includes: receiving, by the terminal, second instruction information sent by the network device, where the second instruction information is used to instruct to activate a second frequency domain resource, and the second frequency domain resource is any one of the frequency domain resources associated with the first frequency domain resource; and activating, by the terminal, the second frequency domain resource according to the second instruction information.

In a possible design, the method further includes: activating, by the terminal based on the configuration information, the first frequency domain resource and the frequency domain resource associated with the first frequency domain resource, where the first frequency domain resource is any one of the at least one frequency domain resource.

This application further provides a communication method, and the method includes: generating, by a network device, configuration information; and sending, by the network device, the configuration information to a terminal, where the configuration information is used to configure at least one frequency domain resource and a frequency domain resource associated with any frequency domain resource in the at least one frequency domain resource, the any frequency domain resource and the frequency domain resource associated with the any frequency domain resource have a same center frequency, and the any frequency domain resource and the frequency domain resource associated with the any frequency domain resource are in different transmission directions.

In a possible design, the method further includes: sending, by the network device, first instruction information to the terminal, where the first instruction information is used to instruct to activate the first frequency domain resource, and the first frequency domain resource is any one of the at least one frequency domain resource.

In a possible design, a plurality of frequency domain resources are associated with the first frequency domain resource; and the method further includes: sending, by the network device, second instruction information to the terminal, where the second instruction information is used to instruct to activate a second frequency domain resource, and the second frequency domain resource is any one of the frequency domain resources associated with the first frequency domain resource.

This application further provides a communication method, and the method includes: receiving, by a terminal, third instruction information from a network device, where the third instruction information is used to instruct to activate a first frequency domain resource pair, and the first frequency domain resource pair includes an uplink frequency domain resource and a downlink frequency domain resource that are associated with each other; and activating, by the terminal, the first frequency domain resource pair according to the third instruction information.

In a possible design, before the receiving, by a terminal, third instruction information from a network device, the method further includes: receiving, by the terminal, configuration information from the network device, where the configuration information is used to configure at least one frequency domain resource pair, and the first frequency domain resource pair is any one or more of the at least one frequency domain resource pair; and determining, by the terminal, the at least one frequency domain resource pair based on the configuration information.

In a possible design, after the receiving, by a terminal, third instruction information from a network device, the method further includes: deactivating, by the terminal, a second frequency domain resource pair, where the second frequency domain resource pair is an activated frequency domain resource pair in the at least one frequency domain resource pair except the first frequency domain resource pair.

In a possible design, the third instruction information includes an identifier of the first frequency domain resource pair.

In a possible design, the frequency domain resources in the first frequency domain resource pair have a same center frequency.

This application further provides a communication method, and the method includes: generating, by a network device, third instruction information, where the third instruction information is used to instruct to activate a first frequency domain resource pair, and the first frequency domain resource pair includes an uplink frequency domain resource and a downlink frequency domain resource that are associated with each other; and sending, by the network device, the third instruction information to a terminal.

In a possible design, the method further includes: sending, by the network device, configuration information to the terminal, where the configuration information is used to configure at least one frequency domain resource pair, and the first frequency domain resource pair is any one or more of the at least one frequency domain resource pair.

In a possible design, the third instruction information includes an identifier of the first frequency domain resource pair.

In a possible design, the frequency domain resources in the first frequency domain resource pair have a same center frequency.

According to a third aspect, this application provides a communications apparatus, where the communications apparatus may be a network device, or may be a chip in the network device, and the communications apparatus has functions of implementing the method example in the first aspect. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more modules corresponding to the functions.

In a possible design, a structure of the communications apparatus includes a sending module, a receiving module, and a processing module. These modules may perform corresponding functions in the example of the first aspect, specifically including: sending 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 with the terminal on the first BP and the at least one second BP.

According to a fourth aspect, this application provides a communications apparatus, where the communications apparatus may be a terminal, or may be a chip in the terminal, and the communications apparatus has functions of implementing the method example in the second aspect. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more modules corresponding to the functions.

In a possible design, a structure of the communications apparatus includes a sending module, a receiving module, and a processing module. These modules may perform corresponding functions in the example of the second aspect, specifically including: receiving indication information sent by a network device, where the indication information is used to indicate at least one second BP associated with a first BP; and performing signal transmission with the network device on the first BP and the at least one second BP.

This application provides a communications apparatus, where the communications apparatus may be a terminal, or may be a chip in the terminal, and the communications apparatus has functions of implementing the method example. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more modules corresponding to the functions.

In a possible design, a structure of the communications apparatus includes a sending module, a receiving module, and a processing module. These modules may perform corresponding functions in the method example, specifically including: receiving third instruction information from a network device, where the third instruction information is used to instruct to activate a first frequency domain resource pair, and the first frequency domain resource pair includes an uplink frequency domain resource and a downlink frequency domain resource that are associated with each other; and activating the first frequency domain resource pair according to the third instruction information.

This application further provides a communications apparatus, where the communications apparatus may be a network device, or may be a chip in the network device, and the communications apparatus has functions of implementing the method example. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or the software includes one or more modules corresponding to the functions.

In a possible design, a structure of the communications apparatus includes a sending module, a receiving module, and a processing module. These modules may perform corresponding functions in the method example, specifically including: generating third instruction information, where the third instruction information is used to instruct to activate a first frequency domain resource pair, and the first frequency domain resource pair includes an uplink frequency domain resource and a downlink frequency domain resource that are associated with each other; and sending the third instruction information to a terminal.

According to a fifth aspect, this application provides a communications apparatus, where the communications apparatus may be a network device, or may be a chip in the network device, the communications apparatus has functions of implementing the method example in the first aspect, and the communications apparatus includes a communications module and a processor.

The communications module is configured to communicate and interact with another device, specifically, is configured to: send indication information to a terminal, where the indication information is used to indicate at least one second BP associated with a first BP; and perform signal transmission with the terminal on the first BP and the at least one second BP.

The communications module may be an RF circuit, a Wi-Fi module, a communications interface, a Bluetooth module, or the like.

The processor is configured to implement a function of the processing module in the third aspect, for example, including: determining the indication information.

Optionally, the communications apparatus may further include the memory, configured to store a program and the like. Specifically, the program may include program code, and the program code includes an instruction. The memory may include a RAM, and may further include a non-transitory storage (e.g., non-transitory memory), for example, at least one magnetic disk memory. The processor executes the application program stored in the memory, to implement the foregoing function.

In a possible manner, the communications module, the processor, and the memory may be interconnected by using the bus. The bus may be a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, or the like. The bus may be classified into an address bus, a data bus, a control bus, and the like.

According to a sixth aspect, this application provides a communications apparatus, where the communications apparatus may be a network device, or may be a chip in the network device, the communications apparatus has functions of implementing the method example in the second aspect, and the communications apparatus includes a communications module.

The communications module is configured to communicate and interact with another device, specifically, is configured to: receive indication information sent by a network device, where the indication information is used to indicate at least one second BP associated with a first BP; and perform signal transmission with the network device on the first BP and the at least one second BP.

The communications module may be an RF circuit, a Wi-Fi module, a communications interface, a Bluetooth module, or the like.

The processor is configured to implement a function of the processing module in the fourth aspect, for example, including: parsing the indication information.

Optionally, the communications apparatus may further include the memory, configured to store a program and the like. Specifically, the program may include program code, and the program code includes an instruction. The memory may include a RAM, and may further include a non-transitory storage (non-transitory memory), for example, at least one magnetic disk memory. The processor executes the application program stored in the memory, to implement the foregoing function.

In a possible manner, the communications module, the processor, and the memory may be interconnected by using the bus. The bus may be a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, or the like. The bus may be classified into an address bus, a data bus, a control bus, and the like.

This application further provides a computer-readable storage medium. The storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the communication method provided in any one of the foregoing designs.

This application further provides a computer program product including an instruction. When the instruction is run on a computer, the computer is enabled to perform the communication method provided in any one of the foregoing designs.

This application further provides a computer program. When the computer program is run on a computer, the computer is enabled to perform the communication method provided in any one of the foregoing designs.

