CN111867038B

CN111867038B - Communication method and device

Info

Publication number: CN111867038B
Application number: CN201910345962.3A
Authority: CN
Inventors: 谢信乾; 龙毅; 郭志恒; 费永强; 毕文平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2023-09-05
Anticipated expiration: 2039-04-26
Also published as: CN111867038A; WO2020216130A1

Abstract

In the communication method, a terminal device receives first indication information from a network device, wherein the first indication information indicates a first time-frequency resource for bearing downlink data, and the time-frequency resource for bearing a demodulation reference signal for demodulating the downlink data is a second time-frequency resource; if the second time-frequency resource and the third time-frequency resource overlap in the time domain, the terminal device receives downlink data from the network device on a fourth time-frequency resource, wherein the third time-frequency resource comprises a time-frequency resource for bearing a synchronous signal, the time-frequency resource for bearing a broadcast channel block and one or more reserved time-frequency resources, the fourth time-frequency resource is a time-frequency resource which is located outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource. The terminal device can only receive the downlink data in the frequency domain range in which the network device can send the demodulation reference signal, so that the accuracy of the terminal device in receiving the downlink data can be effectively improved.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

In the new air interface (NR) technology in the fifth generation mobile communication system (the fifth generation, 5G), a synchronization signal/broadcast channel block (SS/PBCH block, SSB) is defined, and one SSB occupies 4 consecutive orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols in the time domain and occupies 240 consecutive subcarriers, i.e., 20 resource blocks in the frequency domain.

In the prior art, when a network device transmits demodulation reference signals (demodulation reference signal, DMRS) corresponding to a physical downlink shared channel (physical downlink shared channel, PDSCH) to a terminal device, SSB is avoided as much as possible. Since SSB occupies 4 consecutive OFDM symbols, for example, the 4 OFDM symbols may be the 3 rd to 6 th symbols in one slot, there are many limitations when the network device schedules DMRS corresponding to PDSCH, and the scheduling complexity is high, which may cause resource waste. If the DMRS corresponding to the PDSCH and the SSB are allowed to overlap in the time domain, the DMRS cannot be transmitted by the network device on a part of the frequency domain resources, and the channel estimation error of the part of the PDSCH is larger, which affects the accuracy of the terminal device in receiving the PDSCH.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which are used for reducing the scheduling complexity of network equipment and improving the accuracy of receiving downlink data by terminal equipment.

In a first aspect, an embodiment of the present application provides a communication method, including: receiving first indication information from a network device, wherein the first indication information is used for indicating a first time-frequency resource, the first time-frequency resource is used for bearing downlink data, and the time-frequency resource used for bearing a demodulation reference signal for demodulating the downlink data is a second time-frequency resource; if the second time-frequency resource and the third time-frequency resource overlap in the time domain, downlink data is received from the network device on the fourth time-frequency resource, the third time-frequency resource comprises a time-frequency resource used for bearing the synchronous signal and/or the broadcast channel block or a reserved time-frequency resource, the fourth time-frequency resource is a time-frequency resource which is located outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource. The method can be applied to the terminal equipment or the chip in the terminal equipment.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, the network equipment can not transmit the demodulation reference signal on the time-frequency resource with the second time-frequency resource overlapped with the third time-frequency resource, so that the terminal equipment can receive the downlink data on the fourth time-frequency resource except the first frequency domain range in the first time-frequency resource, and the accuracy of receiving the downlink data by the terminal equipment can be effectively improved. Meanwhile, when the network equipment schedules and demodulates the demodulation reference signal of the downlink data, the second time-frequency resource and the third time-frequency resource can be allowed to overlap, so that the scheduling complexity of the network equipment can be reduced, and the resource utilization rate of the system can be improved.

In one possible design, the method further comprises: if the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, and the first time-frequency resource and the third time-frequency resource are overlapped in the time domain, receiving downlink data from the network equipment in a fifth time-frequency resource, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, the terminal equipment can receive downlink data on the time-frequency resource except the third time-frequency resource in the first time-frequency resource, so that the resource utilization rate of the system can be improved.

In one possible design, the first indication information is further used to indicate the second time-frequency resource, so that the communication method is more flexible.

In one possible design, if all time domain symbols included in the second time-frequency resource overlap with the third time-frequency resource, the terminal device may receive downlink data from the network device on a fourth time-frequency resource, where the fourth time-frequency resource is a time-frequency resource in the first time-frequency resource that is located outside the first frequency-domain range; otherwise, if there is a time domain symbol in the second time-frequency resource, which does not overlap with the third time-frequency resource, the terminal device may receive downlink data from the network device on a fifth time-frequency resource, where the fifth time-frequency resource is a time-frequency resource in the first time-frequency resource except the third time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, the second time-frequency resource can be completely overlapped with the third time-frequency resource in the time domain, and can also be partially overlapped. Under the condition that the second time-frequency resource and the third time-frequency resource are completely overlapped in the time domain, the terminal equipment can not receive downlink data from the time-frequency resource which is positioned in the first frequency domain range in the first time-frequency resource, so that the accuracy of receiving the downlink data by the terminal equipment is improved; under the condition that the second time-frequency resource and the third time-frequency resource are partially overlapped in the time domain, the terminal equipment can receive downlink data from the time-frequency resources except the third time-frequency resource in the first time-frequency resource, so that the resource utilization rate of the system can be improved.

In a second aspect, an embodiment of the present application provides a communication method, including: transmitting first indication information to the terminal equipment, wherein the first indication information is used for indicating a first time-frequency resource, the first time-frequency resource is used for bearing downlink data, and the time-frequency resource used for bearing a demodulation reference signal for demodulating the downlink data is a second time-frequency resource; if the second time-frequency resource and the third time-frequency resource overlap in the time domain, downlink data is sent to the terminal equipment on the fourth time-frequency resource, the third time-frequency resource comprises a time-frequency resource used for bearing a synchronous signal and/or a broadcast channel block or a reserved time-frequency resource, the fourth time-frequency resource is a time-frequency resource which is located outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource. The method can be applied to a network device or a chip in the network device.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, the network equipment can not transmit the demodulation reference signal on the time-frequency resource with the second time-frequency resource overlapped with the third time-frequency resource, so that in order to improve the accuracy of receiving the downlink data by the terminal equipment, the network equipment can correspondingly transmit the downlink data to the terminal equipment on a fourth time-frequency resource except the first frequency domain range in the first time-frequency resource. Meanwhile, when the network equipment schedules downlink data and demodulates the demodulation reference signals of the downlink data, the downlink data and the third time-frequency resource are allowed to overlap, so that the scheduling complexity of the network equipment can be reduced, and the resource utilization rate of the system can be improved.

In one possible design, the method further comprises: if the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, and the first time-frequency resource and the third time-frequency resource are overlapped in the time domain, downlink data is sent to the terminal equipment on a fifth time-frequency resource, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, the network equipment can send downlink data on the time-frequency resources except the third time-frequency resource in the first time-frequency resource under the condition that the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, so that the resource utilization rate of the system can be improved.

In one possible design, the first indication information is further used to indicate the second time-frequency resource, thereby making the communication method more flexible.

In one possible design, if all time domain symbols included in the second time-frequency resource overlap with the third time-frequency resource, the network device may send downlink data to the terminal device on a fourth time-frequency resource, where the fourth time-frequency resource is a time-frequency resource located outside the first frequency domain range in the first time-frequency resource; otherwise, if there is a time domain symbol in the second time-frequency resource, which does not overlap with the third time-frequency resource, the network device may send downlink data to the terminal device on a fifth time-frequency resource, where the fifth time-frequency resource is a time-frequency resource in the first time-frequency resource except the third time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, the second time-frequency resource can be completely overlapped with the third time-frequency resource in the time domain, and can also be partially overlapped. Under the condition that the second time-frequency resource and the third time-frequency resource are completely overlapped in the time domain, the network equipment can not send downlink data on the time-frequency resource which is positioned in the first frequency domain range in the first time-frequency resource, so that the accuracy of receiving the downlink data by the terminal equipment is improved; under the condition that the second time-frequency resource and the third time-frequency resource are partially overlapped in the time domain, the network equipment can send downlink data on the time-frequency resources except the third time-frequency resource in the first time-frequency resource, so that the resource utilization rate of the system can be improved.

In a third aspect, an embodiment of the present application provides another communication method, including: the terminal equipment receives first indication information from the network equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources; if there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain, receiving the demodulation reference signal from the network device on the sixth time-frequency resource, where the third time-frequency resource includes a time-frequency resource for carrying the synchronization signal/broadcast channel block SSB or a reserved time-frequency resource, and the sixth time-frequency resource includes a seventh time-frequency resource, where the seventh time-frequency resource is located in the first time-frequency resource and is the same as a time domain occupied by the third time-frequency resource. The method can be applied to the terminal equipment or the chip in the terminal equipment.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, the terminal equipment can receive the demodulation reference signal from the network equipment on the seventh time-frequency resource, and because the time domain occupied by the seventh time-frequency resource is the same as the time domain occupied by the third time-frequency resource, the terminal equipment can correctly decode the downlink data which is transmitted in the first frequency domain range in the first time-frequency resource according to the demodulation reference signal received on the seventh time-frequency resource, thereby improving the accuracy of the terminal equipment for receiving the downlink data. Meanwhile, when the network equipment schedules downlink data and demodulates the demodulation reference signals of the downlink data, the downlink data and the third time-frequency resource are allowed to overlap, so that the scheduling complexity of the network equipment can be reduced, and the resource utilization rate of the system can be improved.

In one possible design, the sixth time-frequency resource further includes a time-frequency resource of the second time-frequency resource other than the third time-frequency resource.

In one possible design, the method further comprises: downlink data is received from the network device on an eighth time-frequency resource, which is a time-frequency resource of the first time-frequency resource other than the third time-frequency resource and the seventh time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, the third time-frequency resource is the time-frequency resource used for bearing the synchronous signal and/or the broadcast channel block or the reserved time-frequency resource, the seventh time-frequency resource is the time-frequency resource used for bearing the demodulation reference signal, and downlink data can be received on the eighth time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource, so that the resource utilization rate of the system is improved.

In a fourth aspect, an embodiment of the present application provides another communication method, including: the network equipment sends first indication information to the terminal equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources; if the second time-frequency resource and the third time-frequency resource overlap in time domain, sending a demodulation reference signal to the terminal equipment on the sixth time-frequency resource, wherein the third time-frequency resource comprises a time-frequency resource used for bearing the synchronous signal/broadcast channel block SSB or a reserved time-frequency resource, the sixth time-frequency resource comprises a seventh time-frequency resource, and the seventh time-frequency resource is located in the first time-frequency resource and is the same as a time domain occupied by the third time-frequency resource in different frequency domains. The method can be applied to a network device, or a chip of the network device.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, the network equipment can send the demodulation reference signal to the terminal equipment on the seventh time-frequency resource, and because the time domain occupied by the seventh time-frequency resource and the time domain occupied by the third time-frequency resource are different in frequency domain, the terminal equipment can correctly decode the downlink data sent in the first frequency domain range in the first time-frequency resource according to the demodulation reference signal received on the seventh time-frequency resource, thereby improving the accuracy of the terminal equipment for receiving the downlink data. Meanwhile, when the network equipment schedules downlink data and demodulates the demodulation reference signals of the downlink data, the downlink data and the third time-frequency resource are allowed to overlap, so that the scheduling complexity of the network equipment can be reduced, and the resource utilization rate of the system can be improved.

In one possible design, the method further comprises: and transmitting downlink data to the terminal equipment on an eighth time-frequency resource, wherein the eighth time-frequency resource is a time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, the third time-frequency resource is the time-frequency resource used for bearing the synchronous signal and/or the broadcast channel block or the reserved time-frequency resource, the seventh time-frequency resource is the time-frequency resource used for bearing the demodulation reference signal, and the network equipment can send downlink data on the eighth time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource, so that the resource utilization rate of the system is improved.

In a fifth aspect, an embodiment of the present application provides a further communication method, including:

the terminal equipment receives first indication information from the network equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources; if the second time-frequency resource and the third time-frequency resource overlap in the time domain, and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-frequency resource, receiving the downlink data from the network device on the fourth time-frequency resource, wherein the third time-frequency resource comprises the time-frequency resource or reserved time-frequency resource used for bearing the synchronization signal and/or the broadcast channel block, the fourth time-frequency resource is the time-frequency resource which is located outside the first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource. The method can be applied to the terminal equipment or the chip of the terminal equipment.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-frequency resource, the terminal equipment can not correctly decode the downlink data sent on the time-frequency resource which is positioned in the first frequency domain range in the first time-frequency resource according to the demodulation reference signals received on the time-frequency resources which are positioned in the second time-frequency resource and are positioned in the third time-frequency resource, so that the terminal equipment can receive the downlink data from the network equipment on the fourth time-frequency resource which is positioned in the first time-frequency resource and is positioned outside the first frequency domain range, thereby improving the accuracy of the downlink data received by the terminal equipment.

In one possible design, the method further comprises: if the second time-frequency resource and the third time-frequency resource overlap in the time domain, and the precoding granularity of the downlink data is equal to the bandwidth of the first time-domain resource, the downlink data is received from the network device on a fifth time-frequency resource, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain and the precoding granularity of the downlink data is equal to the bandwidth of the first time-frequency resource, the terminal equipment can correctly decode the downlink data sent on the time-frequency resource which is positioned in the first frequency domain range in the first time-frequency resource according to the demodulation reference signals received on the time-frequency resources which are positioned in the second time-frequency resource and are positioned in the third time-frequency resource, so that the terminal equipment can receive the downlink data from the network equipment on the time-frequency resources which are positioned in the first time-frequency resource and are positioned in the third time-frequency resource, thereby improving the resource utilization rate of the system.

In a sixth aspect, an embodiment of the present application provides a further communication method, the method being applicable to a network device, the method comprising: the method comprises the steps of sending first indication information to terminal equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources; if the second time-frequency resource and the third time-frequency resource overlap in the time domain, and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-frequency resource, the downlink data is sent to the terminal equipment on the fourth time-frequency resource, the third time-frequency resource comprises the time-frequency resource or reserved time-frequency resource used for bearing the synchronous signal and/or the broadcast channel block, the fourth time-frequency resource is the time-frequency resource which is located outside the first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-frequency resource, the terminal equipment can not correctly decode the downlink data sent on the time-frequency resource which is positioned in the first frequency domain range in the first time-frequency resource according to the demodulation reference signals received on the time-frequency resources which are positioned in the second time-frequency resource and are positioned in the third time-frequency resource, so that the network equipment can send the downlink data to the terminal equipment on the fourth time-frequency resource which is positioned in the first time-frequency resource and is positioned outside the first frequency domain range, thereby improving the accuracy of the downlink data received by the terminal equipment.

In one possible design, the method further comprises: if the second time-frequency resource and the third time-frequency resource overlap in the time domain, and the precoding granularity of the downlink data is equal to the bandwidth of the first time-domain resource, sending the downlink data to the terminal equipment on a fifth time-frequency resource, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

By adopting the technical scheme provided by the embodiment of the application, under the condition that the second time-frequency resource and the third time-frequency resource are overlapped in the time domain and the precoding granularity of the downlink data is equal to the bandwidth of the first time-frequency resource, the terminal equipment can correctly decode the downlink data sent on the time-frequency resource which is positioned in the first frequency domain range in the first time-frequency resource according to the demodulation reference signals received on the time-frequency resources which are positioned in the second time-frequency resource and are positioned in the third time-frequency resource, so that the network equipment can send the downlink data to the terminal equipment on the time-frequency resources which are positioned in the first time-frequency resource and are positioned in the third time-frequency resource, thereby improving the resource utilization rate of the system.

In a seventh aspect, embodiments of the present application provide a communication apparatus having a function of implementing the terminal device in any one of the possible designs of the first aspect or the first aspect, or having a function of implementing the terminal device in any one of the possible designs of the third aspect or the third aspect. The communication device may be a terminal device, for example, a handheld terminal device, a vehicle-mounted terminal device, or the like, or may be a device included in a terminal device, for example, a chip, or may be a device including the terminal device. The functions of the terminal device may be implemented by hardware, or may be implemented by executing corresponding software by hardware, where the hardware or software includes one or more modules corresponding to the functions.

In one possible design, the communication device includes a processing module and a transceiver module in a structure, where the processing module is configured to support the communication device to perform the corresponding function in the first aspect or any of the designs of the first aspect, or to perform the corresponding function in the third aspect or any of the designs of the eighth aspect. The transceiver module is configured to support communication between the communication apparatus and other communication devices, for example, to receive first indication information from the network device or receive downlink data from the network device. The communication device may also include a memory module coupled to the processing module that holds the program instructions and data necessary for the communication device. As an example, the processing module may be a processor, the communication module may be a transceiver, and the storage module may be a memory, where the memory may be integrated with the processor or may be separately provided from the processor, and the present application is not limited thereto.

In another possible design, the communication device may include a processor in a structure, and may further include a memory, where the processor is coupled to the memory, and is configured to execute the computer program instructions stored in the memory, to cause the communication device to perform the method in the first aspect or any one of the possible designs of the first aspect, or to perform the method in the third aspect or any one of the possible designs of the third aspect. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface. When the communication device is a terminal device, the communication interface may be a transceiver or an input/output interface; when the communication means is a chip contained in the terminal device, the communication interface may be an input/output interface of the chip. Alternatively, the transceiver may be a transceiver circuit and the input/output interface may be an input/output circuit.

In an eighth aspect, an embodiment of the present application provides a chip system, including: a processor coupled to a memory for storing a program or instructions that when executed by the processor cause the chip system to implement the method in any one of the possible designs of the first aspect described above, or to implement the method in any one of the possible designs of the third aspect described above.

Alternatively, the processor in the system-on-chip may be one or more. The processor may be implemented in hardware or in software. When implemented in hardware, the processor may be a logic circuit, an integrated circuit, or the like. When implemented in software, the processor may be a general purpose processor, implemented by reading software code stored in a memory.

Alternatively, the memory in the system-on-chip may be one or more. The memory may be integral with the processor or separate from the processor, and the application is not limited. The memory may be a non-transitory processor, such as a ROM, which may be integrated on the same chip as the processor, or may be separately provided on different chips, and the type of memory and the manner of providing the memory and the processor are not particularly limited in the present application.

In a ninth aspect, embodiments of the present application provide a computer-readable storage medium having stored therein computer-readable instructions which, when read and executed by a computer, cause the computer to perform the method of any one of the possible designs of the first aspect described above, or to perform the method of any one of the possible designs of the third aspect described above.

In a tenth aspect, embodiments of the present application provide a computer program product which, when read and executed by a computer, causes the computer to perform the method of any one of the possible designs of the first aspect described above, or to perform the method of any one of the possible designs of the third aspect described above.

In an eleventh aspect, embodiments of the present application provide a communications apparatus having a function of implementing a network device in any one of the possible designs of the second aspect or the second aspect, or having a function of implementing a network device in any one of the possible designs of the fourth aspect or the fourth aspect. The communication means may be a network device, such as a base station, or may be a device, such as a chip, comprised in a network device. The functions of the network device may be implemented by hardware, or may be implemented by executing corresponding software by hardware, where the hardware or software includes one or more modules corresponding to the functions.

In one possible design, the communication device includes a processing module and a transceiver module in a structure, where the processing module is configured to support the communication device to perform the corresponding function in the second aspect or any of the designs of the second aspect, or perform the corresponding function in the fourth aspect or any of the designs of the fourth aspect. The transceiver module is configured to support communication between the communication apparatus and other communication devices, for example, to send first indication information to the terminal device or send downlink data to the terminal device. The communication device may also include a memory module coupled to the processing module that holds the program instructions and data necessary for the communication device. As an example, the processing module may be a processor, the communication module may be a transceiver, and the storage module may be a memory, where the memory may be integrated with the processor or may be separately provided from the processor, and the present application is not limited thereto.

In another possible design, the communication device includes a processor in a structure, and may further include a memory, where the processor is coupled to the memory, and is configured to execute the computer program instructions stored in the memory, to cause the communication device to perform the method in the second aspect or any one of the possible designs of the second aspect, or perform the method in the fourth aspect or any one of the possible designs of the fourth aspect. Optionally, the communication device further comprises a communication interface, and the processor is coupled to the communication interface. When the communication apparatus is a network device, the communication interface may be a transceiver or an input/output interface; when the communication means is a chip contained in the network device, the communication interface may be an input/output interface of the chip. Alternatively, the transceiver may be a transceiver circuit and the input/output interface may be an input/output circuit.

In a twelfth aspect, an embodiment of the present application provides a chip system, including: a processor coupled to a memory for storing a program or instructions that when executed by the processor cause the chip system to implement the method of any one of the possible designs of the second aspect described above or to implement the method of any one of the possible designs of the fourth aspect described above.

In a thirteenth aspect, embodiments of the present application provide a computer-readable storage medium having stored therein computer-readable instructions that, when read and executed by a computer, cause the computer to perform the method of any one of the possible designs of the second aspect described above, or perform the method of any one of the possible designs of the fourth aspect described above.

In a fourteenth aspect, embodiments of the present application provide a computer program product which, when read and executed by a computer, causes the computer to perform the method of any one of the possible designs of the second aspect described above, or to perform the method of any one of the possible designs of the fourth aspect described above.

In a fifteenth aspect, an embodiment of the present application provides a communication system including the network device and at least one terminal device described in the above aspects.

Drawings

Fig. 1 is a schematic diagram of a network architecture of a communication system to which an embodiment of the present application is applicable;

fig. 2 is a schematic diagram of a demodulation reference signal DMRS according to an embodiment of the present application;

fig. 3 is a schematic diagram of a synchronization signal/broadcast channel block SSB according to an embodiment of the present application;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 5a is a schematic diagram of a first time-frequency resource and a second time-frequency resource according to an embodiment of the present application;

fig. 5b is a schematic diagram of a third time-frequency resource and a fourth time-frequency resource according to an embodiment of the present application;

fig. 5c is a schematic diagram of a fifth time-frequency resource according to an embodiment of the present application;

fig. 5d is a schematic diagram of a second time-frequency resource and a third time-frequency resource partially overlapping in a time domain according to an embodiment of the present application;

Fig. 6 is a flow chart of another communication method according to an embodiment of the present application;

fig. 7 is a schematic diagram of a sixth time-frequency resource and a seventh time-frequency resource provided in an embodiment of the present application;

fig. 8 is a flow chart of another communication method according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 is another schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 12 is another schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, such as: global system for mobile communications (global system for mobile communications, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, WIMAX) communication system, fifth generation (5th generation,5G) system or New Radio (NR), or application to future communication systems or other similar communication systems, etc.

Fig. 1 is a schematic diagram of a network architecture of a communication system according to an embodiment of the present application. The communication system comprises a network device 110, a terminal device 120, a terminal device 130 and a terminal device 140. The network device may communicate with at least one terminal device, such as terminal device 120, via an Uplink (UL) and a Downlink (DL).

The network device in fig. 1 may be an access network device, such as a base station. Wherein the access network devices correspond to different devices in different systems, e.g. in the fourth generation mobile communication technology (the 4) ^th generation, 4G) may correspond to an eNB in a system and to an access network device in 5G, such as a gNB, in a system of 5G. Although only terminal device 120, terminal device 130, and terminal device 140 are shown in fig. 1, it should be understood that a network device may serve multiple terminal devices, and the number of terminal devices in the communication system is not limited in the embodiments of the present application. Similarly, the terminal device in fig. 1 is illustrated by taking a mobile phone as an example, and it should be understood that the terminal device in the embodiment of the present application is not limited thereto.

In the following, some terms in the embodiments of the present application are explained for easy understanding by those skilled in the art.

1) A terminal device, which may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., is a device that provides voice and/or data connectivity to a user. The terminal device may communicate with the core network via a radio access network (radio access network, RAN), exchanging voice and/or data with the RAN. For example, the terminal device may be a handheld device, an in-vehicle device, or the like having a wireless connection function. Currently, examples of some terminal devices are: a mobile phone, a tablet, a notebook, a palm, a mobile internet device (mobile internet device, MID), a wearable device, a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.

2) The network device is a device in a network for accessing a terminal device to a wireless network. The network device may be a node in a radio access network, also referred to as a base station, and also referred to as a radio access network (radio access network, RAN) node (or device). The network device may be operable to inter-convert the received air frames with Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB) or an eNB or an e-NodeB, evolutional Node B) in a long term evolution (long term evolution, LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (next generation Node B, gNB) in a New Radio (NR) system of a fifth generation mobile communication technology (5th generation,5G), or may also include a transmission receiving point (transmission reception point, TRP), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), or a WiFi Access Point (AP), etc., and may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud radio access network, cloudRAN) system, and the embodiment of the present application is not limited.

3) The demodulation reference signal DMRS refers to a reference signal for demodulation at a receiving end. Due to the fading characteristic of the wireless channel, signals carried on Resource Elements (REs) are distorted after being transmitted through the channel, and the signal distortion is represented as a signal coefficient. In order to be able to recover the signal at the receiving end, the signal coefficients need to be estimated. The demodulation reference signal is one of the means, that is, a transmitting end transmits a known signal on a specific RE, a receiving end estimates a channel coefficient according to the received signal and the known signal, and performs reception demodulation on a data signal by using the estimated channel coefficient. As shown in fig. 2, when a network device transmits a PDSCH of a physical downlink shared channel carrying downlink data information to a terminal device, the network device may simultaneously transmit DMRS corresponding to the PDSCH.

4) The synchronization signal/broadcast channel block SSB, SSB includes a primary synchronization signal (primary synchronization signal, PSS), a secondary synchronization signal (secondary synchronization signal, SSS), and a physical broadcast channel (physical broadcast channel, PBCH). One SSB occupies 4 consecutive OFDM symbols in the time domain and 240 consecutive subcarriers in the frequency domain, the 240 subcarriers being numbered from 0 to 239. Typically one resource block comprises 12 consecutive sub-carriers, 12 sub-carriers numbered from 0 to 11, such that 240 sub-carriers occupied by one SSB are contained in 20 resource blocks, and the 20 resource blocks are numbered from 0 to 19.

As shown in fig. 3, the 1 st OFDM symbol from the left in SSB is used to carry PSS, the occupied subcarriers are the subcarriers numbered 56 to 182, the remaining subcarriers in the OFDM symbol are set to 0, that is, the subcarriers numbered 0 to 55, and the subcarriers numbered 183 to 239 are set to 0. The 2 nd OFDM symbol and the 4 th OFDM symbol from the left are used for bearing the PBCH, and one DMRS corresponding to the PBCH is arranged in every 4 continuous subcarriers. The 3 rd OFDM symbol from the left is used to carry SSS and PBCH, where subcarriers numbered 56 to 182 are used to carry SSS, subcarriers numbered 1 to 47 and 192 to 239 are used to carry PBCH, and the remaining word carriers in the OFDM symbol are set to 0.

5) And the downlink data channel is used for bearing downlink data information. For example, a physical downlink shared channel (physical downlink shared channel, PDSCH), or an enhanced physical downlink shared channel (enhanced physical downlink control channel, EPDSCH), or other downlink control channel. Herein, the downlink data channel is described by taking PDSCH as an example.

6) The terms "system" and "network" in embodiments of the application may be used interchangeably. "plurality" means two or more, and "plurality" may also be understood as "at least two" in this embodiment of the present application. "at least one" may be understood as one or more, for example as one, two or more. For example, including at least one means including one, two or more, and not limiting what is included. For example, at least one of A, B and C is included, then A, B, C, A and B, A and C, B and C, or A and B and C may be included. Likewise, the understanding of the description of "at least one" and the like is similar. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/", unless otherwise specified, generally indicates that the associated object is an "or" relationship.

Unless stated to the contrary, the embodiments of the present application refer to ordinal numbers such as "first," "second," etc., for distinguishing between multiple objects, but are not used to define an order, timing, priority, or importance of the multiple objects, and the descriptions of "first," "second," etc. do not necessarily define the objects to be different.

Fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application. The method comprises the following steps S401 to S402:

step S401, the terminal device receives the first indication information from the network device.

In the embodiment of the present application, the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource used for carrying downlink data, for example, the first time-frequency resource may be a time-frequency resource occupied by a downlink data channel (such as PDSCH). The time-frequency resource used for carrying the demodulation reference signal for demodulating the downlink data is a second time-frequency resource, for example, the time-frequency resource occupied by the DMRS corresponding to the PDSCH may be a second time-frequency resource. In one possible design, the first indication information may be used to indicate only the first time-frequency resource, or the first indication information may also be used to indicate the first time-frequency resource and the second time-frequency resource.

Fig. 5a schematically illustrates a first time-frequency resource and a second time-frequency resource in an embodiment of the application. As shown in fig. 5a, the first time-frequency resource may be used to carry PDSCH, where the time domain range corresponding to the first time-frequency resource is a first time segment, and the terminal device may receive PDSCH from the network device in the first time segment; the second time-frequency resource may be used to carry DMRS corresponding to the PDSCH, where a time domain range corresponding to the second time-frequency resource is a second time segment, and the terminal device may receive the DMRS corresponding to the PDSCH from the network device in the second time segment. In fig. 5a, the first time segment includes 10 OFDM symbols and the second time segment includes 2 OFDM symbols, but it should be understood that this is only an example, and the number of OFDM symbols included in the first time segment and the second time segment is not particularly limited by the present application.

In one possible design, the first indication information may be carried in downlink control information (downlink control information, DCI) carried on a physical downlink control channel (physical downlink control channel, PDCCH), or may also be carried in media access control (media access control, MAC) layer signaling, or radio resource control (radio resource control, RRC) signaling, which is not limited by the present application.

In step S402, if the second time-frequency resource overlaps with the third time-frequency resource, the terminal device receives downlink data from the network device on the fourth time-frequency resource.

In the embodiment of the present application, the third time-frequency resource may be a time-frequency resource for carrying the synchronization signal and/or the broadcast channel block SSB, or may also be a reserved time-frequency resource. The reserved time-frequency resources refer to time-frequency resources which are not used for bearing downlink data and/or demodulation reference signals used for decoding the downlink data, namely, the time-frequency resources which are not used for bearing the PDSCH and/or the DMRS corresponding to the PDSCH can be understood.

As described above, the second time-frequency resource is a time-frequency resource for carrying the DMRS, and the second time-frequency resource may overlap with the third time-frequency resource in the time domain. If the second time-frequency resource and the third time-frequency resource overlap in the time domain, in the embodiment of the present application, the frequency domain range in which the second time-frequency resource and the third time-frequency resource overlap is referred to as the first frequency domain range. In the case that the second time-frequency resource and the third time-frequency resource overlap in the time domain, the terminal device may receive downlink data from the network device in a fourth time-frequency resource, where the fourth time-frequency resource is a time-frequency resource located outside the first frequency-domain range in the first time-frequency resource.

Taking the first time-frequency resource as a time-frequency resource indicated by the network device and used for bearing the PDSCH, the second time-frequency resource as a time-frequency resource for bearing the DMRS corresponding to the PDSCH, the third time-frequency resource as a time-frequency resource for bearing the SSB as an example, fig. 5b illustrates the third time-frequency resource and the fourth time-frequency resource in the embodiment of the present application. As shown in fig. 5b, in the second time segment, the second time-frequency resource overlaps with the third time-frequency resource in the time domain, and the second time-frequency resource overlaps with the third time-frequency resource in the frequency domain, that is, the first frequency domain range is the frequency domain range occupied by the SSB. In the first time segment, the time-frequency resource in the first frequency domain is not used for transmitting the PDSCH, and the time-frequency resource outside the first frequency domain is the fourth time-frequency resource in the first time-frequency resource, which can be used for transmitting the PDSCH. In the embodiment of the application, the terminal device can only receive the PDSCH from the network device on the fourth time-frequency resource, and accordingly, the network device can only send the PDSCH to the terminal device on the fourth time-frequency resource. Because the network device can not send the PDSCH to the terminal device on the frequency domain resource block without the DMRS, the accuracy of the terminal device in receiving the PDSCH can be effectively improved, and the data transmission efficiency is improved. Meanwhile, when the network equipment schedules the PDSCH and the DMRS corresponding to the PDSCH, the DMRS and the time-frequency resources occupied by the SSB are allowed to overlap, so that the scheduling complexity of the network equipment can be reduced, and the resource utilization rate of the system is improved.

In one possible design, if the second time-frequency resource and the third time-frequency resource do not overlap in the time domain, but there is an overlap in the time domain between the first time-frequency resource and the third time-frequency resource, the terminal device may receive downlink data from the network device on the fifth time-frequency resource. The fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource. Fig. 5c illustrates a fifth time-frequency resource in an embodiment of the application. As shown in fig. 5c, the time-frequency resources where the first time-frequency resource and the third time-frequency resource overlap are time-frequency resources occupied by the SSB, and the fifth time-frequency resource is the rest of time-frequency resources except the third time-frequency resource occupied by the SSB in the first time-frequency resource.

In one possible design, the second time-frequency resource may overlap with the third time-frequency resource entirely in the time domain, or may overlap partially in the time domain. The fact that the second time-frequency resource and the third time-frequency resource overlap completely in the time domain means that all time-domain symbols included in the second time-frequency resource overlap with the third time-frequency resource, for example, as shown in fig. 5b, at this time, the terminal device may receive downlink data from the network device on a fourth time-frequency resource, where the fourth time-frequency resource is a time-frequency resource in the first time-frequency resource except for the first frequency domain range. That is, since the second time-frequency resource and the third time-frequency resource are completely overlapped in the time domain, the network device may not transmit the DMRS in the first frequency domain, and accordingly, the network device does not transmit the PDSCH in the first time-frequency resource located in the first frequency domain, so that the problem that the terminal device cannot correctly decode the PDSCH transmitted in the first time-frequency resource located in the first frequency domain can be avoided.

The fact that the second time-frequency resource and the third time-frequency resource are partially overlapped in the time domain means that there is a time-domain symbol that does not overlap with the third time-frequency resource in the second time-frequency resource, as shown in fig. 5d, at this time, the terminal device may receive downlink data from the network device on a fifth time-frequency resource, where the fifth time-frequency resource is a time-frequency resource other than the third time-frequency resource in the first time-frequency resource. That is, if the second time-frequency resource and the third time-frequency resource only partially overlap in the time domain, the network device may further transmit a portion of the DMRS in the frequency domain where the second time-frequency resource and the third time-frequency resource overlap, so that the network device may transmit the PDSCH on the time-frequency resource located in the first frequency domain in the first time-frequency resource, so that the terminal device may decode the PDSCH according to the portion of the DMRS received in the first frequency domain.

Fig. 6 is a flow chart of another communication method according to an embodiment of the application. The method comprises the following steps S601 to S602:

step S601, the terminal device receives first indication information from the network device.

In the embodiment of the present application, the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource used for carrying downlink data, for example, the first time-frequency resource may be a time-frequency resource occupied by a downlink data channel (such as PDSCH). The time-frequency resource used for carrying the demodulation reference signal for demodulating the downlink data is a second time-frequency resource, for example, the time-frequency resource occupied by the DMRS corresponding to the PDSCH may be a second time-frequency resource. In one possible design, the first indication information may be used to indicate only the first time-frequency resource, or the first indication information may also be used to indicate the first time-frequency resource and the second time-frequency resource. As shown in fig. 5a, the first time-frequency resource may be used to carry PDSCH, where the time domain range corresponding to the first time-frequency resource is a first time segment, and the terminal device may receive PDSCH from the network device in the first time segment; the second time-frequency resource may be used to carry DMRS corresponding to the PDSCH, where a time domain range corresponding to the second time-frequency resource is a second time segment, and the terminal device may receive the DMRS corresponding to the PDSCH from the network device in the second time segment.

Similarly, the first indication information may be carried in downlink control information (downlink control information, DCI) carried on a physical downlink control channel (physical downlink control channel, PDCCH), or may also be carried in media access control (media access control, MAC) layer signaling, or radio resource control (radio resource control, RRC) signaling, which is not limited by the present application.

In step S602, if there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain, the terminal device receives the demodulation reference signal from the network device on the sixth time-frequency resource.

As described above, the second time-frequency resource is a time-frequency resource for carrying the DMRS, and if there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain, in the embodiment of the present application, the frequency domain range where the second time-frequency resource overlaps with the third time-frequency resource may be referred to as the first frequency domain range.

In the case where there is overlap in the time domain between the second time-frequency resource and the third time-frequency resource, the terminal device may receive the DMRS from the network device on the sixth time-frequency resource and receive the PDSCH from the network device on the eighth time-frequency resource. The sixth time-frequency resource comprises a seventh time-frequency resource and a time-frequency resource except the third time-frequency resource in the second time-frequency resource, and the eighth time-frequency resource is a time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource.

Fig. 7 illustrates a sixth time-frequency resource and a seventh time-frequency resource in an embodiment of the present application. As shown in fig. 7, the seventh time-frequency resource is located in the first time-frequency resource and is the same as the time domain occupied by the third time-frequency resource in different frequency domains. I.e. the frequency domain range occupied by the seventh time-frequency resource is also the first frequency domain range, but the number of time-domain symbols occupied by the seventh time-frequency resource may be smaller than the number of symbols comprised in the first time segment. The seventh time-frequency resource may be understood as a time-frequency resource of the DMRS that is additionally transmitted in a frequency domain where the DMRS cannot be transmitted because the DMRS overlaps with the time-frequency resource occupied by the SSB in the time domain. In addition to the seventh time-frequency resource, the terminal device may also receive the demodulation reference signal on a time-frequency resource other than the third time-frequency resource in the second time-frequency resource.

It can be seen that the network device can additionally transmit the DMRS to the terminal device on the time-frequency resource located in the first frequency domain in the first time-frequency resource, so that the problem that the terminal device cannot correctly demodulate the PDSCH transmitted on the time-frequency resource located in the first frequency domain in the first time-frequency resource due to the fact that the network device cannot transmit the DMRS on the frequency domain where the second time-frequency resource overlaps with the third time-frequency resource can be effectively avoided, and the accuracy of receiving the PDSCH by the terminal device is improved.

In one possible design, if the second time-frequency resource and the third time-frequency resource do not overlap in the time domain, but the first time-frequency resource and the third time-frequency resource overlap, the terminal device may receive downlink data from the network device on a fifth time-frequency resource, where the fifth time-frequency resource is a time-frequency resource other than the third time-frequency resource in the first time-frequency resource, as shown in fig. 5 c.

Fig. 8 is a flow chart of another communication method according to an embodiment of the application. The method includes steps S801 to S802 as follows:

step S801, the terminal device receives first indication information from the network device.

In the embodiment of the present application, the first indication information is used to indicate a first time-frequency resource, where the first time-frequency resource is a time-frequency resource used for carrying downlink data, for example, the first time-frequency resource may be a time-frequency resource occupied by a downlink data channel (such as PDSCH). The time-frequency resource used for carrying the demodulation reference signal for demodulating the downlink data is a second time-frequency resource, for example, the time-frequency resource occupied by the DMRS corresponding to the PDSCH may be a second time-frequency resource. In one possible design, the first indication information may be used to indicate only the first time-frequency resource, or the first indication information may also be used to indicate the first time-frequency resource and the second time-frequency resource. As shown in fig. 5a, the first time-frequency resource and the second time-frequency resource may be used to carry PDSCH, where the time domain range corresponding to the first time-frequency resource is a first time segment, and the terminal device may receive PDSCH from the network device in the first time segment; the second time-frequency resource may be used to carry DMRS corresponding to the PDSCH, where a time domain range corresponding to the second time-frequency resource is a second time segment, and the terminal device may receive the DMRS corresponding to the PDSCH from the network device in the second time segment.

Step 802: if the second time-frequency resource and the third time-frequency resource overlap in the time domain and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-frequency resource, the terminal equipment receives the downlink data from the network equipment in the fourth time-frequency resource.

As described above, the second time-frequency resource is a time-frequency resource for carrying the DMRS, and the second time-frequency resource may overlap with the third time-frequency resource in the time domain. If the second time-frequency resource and the third time-frequency resource overlap in the time domain, in the embodiment of the present application, the frequency domain range in which the second time-frequency resource and the third time-frequency resource overlap is referred to as the first frequency domain range. The fourth time-frequency resource is a time-frequency resource which is located outside the first frequency domain range in the first time-frequency resource.

In order to adapt to the channel quality, when the network device transmits PDSCH or DMRS corresponding to PDSCH to the terminal device, the network device may perform precoding on the signal, where precoding may also be understood as a signal preprocessing. The network device may use different precoding granularity for different frequency domain resources, taking into account the different wireless channel quality at different frequency domain locations. The precoding granularity may be 2 resource blocks, 4 resource blocks, etc. which are smaller than a PDSCH bandwidth, or may be all frequency domain resources occupied by a PDSCH with a PDSCH bandwidth area. The precoding granularity refers to that if the precoding granularity is 2 resource blocks, the terminal device can consider that the precoding modes in the 2 frequency domain resource blocks are the same, and the precoding modes among the different 2 frequency domain resource blocks are different; if the precoding granularity is all the frequency domain resources occupied by the PDSCH, the terminal device may consider that the precoding manner of all the frequency domain resource blocks is the same.

Therefore, in step S802, if there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain, the network device may not be able to transmit the DMRS on the time-frequency resource where the second time-frequency resource overlaps with the third time-frequency resource. If the precoding granularity of the PDSCH is smaller than the bandwidth of the first time-frequency resource, the terminal device cannot correctly decode the PDSCH transmitted by the network device on the time-frequency resource located in the first frequency domain in the first time-frequency resource according to the DMRS received from the rest of time-frequency resources except the third time-frequency resource in the second time-frequency resource. At this time, the terminal device may only receive the PDSCH transmitted by the network device on the remaining time-frequency resources (i.e., the fourth time-frequency resource) located outside the first frequency domain in the first time-frequency resource, so that the accuracy of the terminal device in receiving the downlink data channel may be effectively improved, and the data transmission efficiency may be improved.

In one possible design, if the second time-frequency resource overlaps with the third time-frequency resource in the time domain, and the precoding granularity of the downlink data channel is equal to the bandwidth of the first time-domain resource, the bandwidth of the first time-domain resource is all the frequency domain resources occupied by the PDSCH. At this time, the terminal device may receive the downlink data from the network device on a fifth time-frequency resource other than the third time-frequency resource in the first time-frequency resource. In this way, even if the terminal device cannot receive the DMRS on the time-frequency resource where the second time-frequency resource overlaps with the third time-frequency resource, the terminal device can correctly decode the PDSCH transmitted on the time-frequency resource located in the first frequency domain range in the first time-frequency resource according to the DMRS received from the time-frequency resource other than the third time-frequency resource in the second time-frequency resource because the precoding granularity of the PDSCH is equal to all the frequency domain resources occupied by the PDSCH, thereby improving the accuracy of the terminal device in receiving the downlink data channel and improving the data transmission efficiency.

Referring to fig. 9, a schematic structural diagram of a communication device according to an embodiment of the present application is provided, and the communication device 900 includes: a transceiver module 910 and a processing module 920. The communication device may be used to implement the functionality relating to the terminal device in any of the method embodiments described above. For example, the communication means may be a terminal device, such as a handheld terminal device or a vehicle mounted terminal device; the communication apparatus may also be a chip included in the terminal device or an apparatus including the terminal device, such as various types of vehicles, or the like.

When the communication apparatus is used as a terminal device and the method embodiment shown in fig. 4 is executed, the processing module 920 is configured to receive, through the transceiver module 910, downlink data from the network device on the fourth time-frequency resource if there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain; the transceiver module 910 is configured to receive the first indication information from the network device and receive a demodulation reference signal.

When the communication apparatus is used as a terminal device and performs the method embodiment shown in fig. 6, the processing module 920 is configured to receive, by using the transceiver module 910, a demodulation reference signal from the network device on a sixth time-frequency resource when there is an overlap between the second time-frequency resource and the third time-frequency resource in a time domain; the transceiver module 910 is configured to receive first indication information from a network device and receive downlink data.

When the communication apparatus is used as a terminal device and the method embodiment shown in fig. 8 is executed, the processing module 920 is configured to receive, through the transceiver module 910, downlink data from a network device on a fourth time-frequency resource when there is an overlap between the second time-frequency resource and the third time-frequency resource in a time domain and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-domain resource; the transceiver module 910 is configured to receive first indication information from a network device and receive a demodulation reference signal.

The processing module 920 involved in the communication device may be implemented by a processor or processor-related circuit component and the transceiver module 910 may be implemented by a transceiver or transceiver-related circuit component. The operations and/or functions of the respective modules in the communication device are not described herein for brevity in order to implement the respective flows of the methods shown in fig. 4, 6 and 8.

Fig. 10 is a schematic diagram of another structure of a communication device according to an embodiment of the application. The communication device may specifically be a terminal device. For easy understanding and ease of illustration, in fig. 10, a mobile phone is taken as an example of the terminal device. As shown in fig. 10, the terminal device includes a processor, and may further include a memory, and of course, may also include a radio frequency circuit, an antenna, an input/output device, and the like. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is mainly used for storing software programs and data. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of terminal apparatuses may not have an input/output device.

When data need to be sent, the processor carries out baseband processing on the data to be sent and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signal and then sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives a 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. For ease of illustration, only one memory and processor is shown in fig. 10. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, as the embodiments of the application are not limited in this respect.

In the embodiment of the application, the antenna and the radio frequency circuit with the receiving and transmitting functions can be regarded as a receiving and transmitting unit of the terminal equipment, and the processor with the processing function can be regarded as a processing unit of the terminal equipment. As shown in fig. 10, the terminal device includes a transceiving unit 1010 and a processing unit 1020. The transceiver unit may also be referred to as a transceiver, transceiver device, etc. The processing unit may also be called a processor, a processing board, a processing module, a processing device, etc. Alternatively, a device for implementing a receiving function in the transceiver unit 1010 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver unit 1010 may be regarded as a transmitting unit, i.e., the transceiver unit 1010 includes a receiving unit and a transmitting unit. The transceiver unit may also be referred to as a transceiver, transceiver circuitry, or the like. The receiving unit may also be referred to as a receiver, or receiving circuit, among others. The transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc. It should be understood that, the transceiver 1010 is configured to perform the transmitting operation and the receiving operation on the terminal device side in the above method embodiment, and the processing unit 1020 is configured to perform other operations on the terminal device other than the transmitting operation in the above method embodiment.

Referring to fig. 11, a schematic structural diagram of another communication device provided in an embodiment of the present application is shown, and the communication device 1100 includes: a transceiver module 1110 and a processing module 1120. The communication means may be adapted to implement the functions relating to the network device in any of the method embodiments described above. The communication means may be, for example, a network device or a chip comprised in a network device.

When the communication apparatus is used as a network device and performs the method embodiment shown in fig. 4, a transceiver module 1110 is configured to send first indication information to a terminal device; and a processing module 1120, configured to send, through the transceiver module 1110, the downlink data to the terminal device on the fourth time-frequency resource when the second time-frequency resource overlaps with the third time-frequency resource in the time domain.

When the communication apparatus is used as a network device and performs the method embodiment shown in fig. 6, a transceiver module 1110 is configured to send first indication information to a terminal device; a processing module 1120, configured to send, through the transceiver module 1110, the demodulation reference signal to the terminal device on the sixth time-frequency resource when there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain.

When the communication apparatus is used as a network device and performs the method embodiment shown in fig. 8, a transceiver module 1110 is configured to send first indication information to a terminal device; a processing module 1120, configured to send, through the transceiver module 1110, the downlink data to the terminal device on the fourth time-frequency resource when there is an overlap between the second time-frequency resource and the third time-frequency resource in the time domain and the precoding granularity of the downlink data is smaller than the bandwidth of the first time-domain resource.

It is to be appreciated that the processing module 1120 involved in the communication device may be implemented by a processor or processor-related circuit component and that the transceiver module 1110 may be implemented by a transceiver or transceiver-related circuit component. The operations and/or functions of the respective modules in the communication device are not described herein for brevity in order to implement the respective flows of the methods shown in fig. 4, 6 and 8.

Fig. 12 is a schematic diagram of another communication device according to an embodiment of the application. The communication means may in particular be a network device, such as a base station, for implementing the functions of the network device as described in any of the method embodiments above.

The network device includes: one or more radio frequency units, such as a remote radio frequency unit (remote radio unit, RRU) 1201 and one or more baseband units (BBU) (also referred to as digital units, DUs) 1202. The RRU 1201 may be referred to as a transceiver unit, transceiver circuitry, or transceiver, etc., which may include at least one antenna 12011 and a radio frequency unit 12012. The RRU 1201 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals. The BBU 1202 is mainly used for baseband processing, control of a base station, and the like. The RRU 1201 and BBU 1202 may be physically located together or physically separate, i.e., distributed base stations.

The BBU 1202 is a control center of a base station, and may also be referred to as a processing unit, and is mainly configured to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on. For example, the BBU 1202 may be configured to control a base station to perform the above-described operation procedures with respect to the network device in the method embodiment.

In one example, the BBU 1202 may be configured by one or more single boards, where the multiple single boards may support a single access indicated radio access network (e.g., an LTE network), or may support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks) respectively. The BBU 1202 can also include a memory 12021 and a processor 12022, the memory 12021 for storing necessary instructions and data. The processor 12022 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the transmitting operation in the foregoing method embodiment. The memory 12021 and processor 12022 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits.

The embodiment of the application also provides a chip system, which comprises: a processor coupled to a memory for storing programs or instructions which, when executed by the processor, cause the system-on-a-chip to implement the method of any of the method embodiments described above.

The system-on-chip may be, for example, a field programmable gate array (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

It should be understood that the steps in the above-described method embodiments may be accomplished by integrated logic circuitry in hardware in a processor or instructions in the form of software. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution.

Embodiments of the present application also provide a computer-readable storage medium having stored therein computer-readable instructions which, when read and executed by a computer, cause the computer to perform the method of any of the method embodiments described above.

Embodiments of the present application also provide a computer program product which, when read and executed by a computer, causes the computer to perform the method of any of the method embodiments described above.

The embodiment of the application also provides a communication system which comprises network equipment and at least one terminal equipment in each method embodiment.

It should be appreciated that the processors referred to in embodiments of the present application may be central processing units (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the memory referred to in embodiments of the present application may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

Note that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) is integrated into the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, the method comprising:

receiving first indication information from a network device, wherein the first indication information is used for indicating a first time-frequency resource, the first time-frequency resource is used for bearing downlink data, and the time-frequency resource used for bearing a demodulation reference signal for demodulating the downlink data is a second time-frequency resource;

and if the second time-frequency resource and the third time-frequency resource overlap in the time domain, receiving the downlink data from the network device on a fourth time-frequency resource, wherein the third time-frequency resource comprises a time-frequency resource used for bearing a synchronous signal and/or a broadcast channel block or a reserved time-frequency resource, the fourth time-frequency resource is a time-frequency resource which is located outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource.

2. The method according to claim 1, wherein the method further comprises:

and if the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, and the first time-frequency resource and the third time-frequency resource are overlapped in the time domain, receiving the downlink data from the network equipment in a fifth time-frequency resource, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

3. A method of communication, the method comprising:

transmitting first indication information to terminal equipment, wherein the first indication information is used for indicating first time-frequency resources, and the first time-frequency resources are used for bearing downlink data;

if the second time-frequency resource and the third time-frequency resource overlap in the time domain, downlink data is sent to the terminal equipment on a fourth time-frequency resource, wherein the second time-frequency resource is a time-frequency resource used for bearing demodulation reference signals, the third time-frequency resource comprises a time-frequency resource used for bearing synchronizing signals and/or broadcasting channel blocks or a reserved time-frequency resource, the fourth time-frequency resource is a time-frequency resource which is located outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource.

4. A method according to claim 3, characterized in that the method further comprises:

and if the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, and the first time-frequency resource and the third time-frequency resource are overlapped in the time domain, transmitting the downlink data to the terminal equipment on a fifth time-frequency resource, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

5. A method of communication, the method comprising:

and if the second time-frequency resource and the third time-frequency resource overlap in the time domain, receiving the demodulation reference signal from the network equipment on a sixth time-frequency resource, wherein the third time-frequency resource comprises a time-frequency resource used for bearing a synchronous signal/broadcast channel block (SSB) or a reserved time-frequency resource, the sixth time-frequency resource comprises a seventh time-frequency resource, and the seventh time-frequency resource is positioned in the first time-frequency resource and is the same as a time domain and a frequency domain occupied by the third time-frequency resource.

6. The method of claim 5, wherein the sixth time-frequency resource further comprises a time-frequency resource of the second time-frequency resource other than the third time-frequency resource.

7. The method of claim 5, wherein the method further comprises:

and receiving the downlink data from the network equipment on an eighth time-frequency resource, wherein the eighth time-frequency resource is a time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource.

8. The method according to any one of claims 5 to 7, further comprising:

9. A method of communication, the method comprising:

transmitting first indication information to terminal equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources;

if the second time-frequency resource and the third time-frequency resource overlap in time domain, the demodulation reference signal is sent to the terminal device on a sixth time-frequency resource, wherein the third time-frequency resource comprises a time-frequency resource for bearing a synchronization signal/broadcast channel block SSB or a reserved time-frequency resource, the sixth time-frequency resource comprises a seventh time-frequency resource, and the seventh time-frequency resource is located in the first time-frequency resource and is the same as a time domain and a frequency domain occupied by the third time-frequency resource.

10. The method of claim 9, wherein the sixth time-frequency resource further comprises a time-frequency resource of the second time-frequency resource other than the third time-frequency resource.

11. The method according to claim 9, wherein the method further comprises:

and transmitting the downlink data to the terminal equipment on an eighth time-frequency resource, wherein the eighth time-frequency resource is a time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource.

12. The method according to any one of claims 9 to 11, further comprising:

13. A communication device, the device comprising:

the receiving and transmitting module is used for receiving first indication information from the network equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources;

And the processing module is used for receiving the downlink data on a fourth time-frequency resource through the receiving and transmitting module if the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, wherein the third time-frequency resource comprises a time-frequency resource or a reserved time-frequency resource used for bearing a synchronous signal and/or a broadcast channel block, the fourth time-frequency resource is a time-frequency resource which is positioned outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource.

14. The apparatus of claim 13, wherein the processing module is further configured to:

and if the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, and the first time-frequency resource and the third time-frequency resource are overlapped in the time domain, receiving the downlink data from the network equipment on a fifth time-frequency resource through the transceiver module, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

15. A communication device, the device comprising:

the receiving and transmitting module is used for sending first indication information to the terminal equipment, wherein the first indication information is used for indicating first time-frequency resources, and the first time-frequency resources are used for bearing downlink data;

And the processing module is used for sending downlink data to the terminal equipment on a fourth time-frequency resource through the receiving and transmitting module if the second time-frequency resource and the third time-frequency resource are overlapped in the time domain, wherein the second time-frequency resource is used for bearing demodulation reference signals, the third time-frequency resource comprises time-frequency resources or reserved time-frequency resources used for bearing synchronous signals and/or broadcast channel blocks, the fourth time-frequency resource is a time-frequency resource which is located outside a first frequency domain range in the first time-frequency resource, and the first frequency domain range is the same as the frequency domain occupied by the third time-frequency resource.

16. The apparatus of claim 15, wherein the processing module is further configured to:

and if the second time-frequency resource and the third time-frequency resource are not overlapped in the time domain, and the first time-frequency resource and the third time-frequency resource are overlapped in the time domain, sending the downlink data to the terminal equipment on a fifth time-frequency resource through the transceiver module, wherein the fifth time-frequency resource is a time-frequency resource except the third time-frequency resource in the first time-frequency resource.

17. A communication device, the device comprising:

and the processing module is configured to receive, through the transceiver module, the demodulation reference signal from the network device on a sixth time-frequency resource if the second time-frequency resource overlaps with a third time-frequency resource, where the third time-frequency resource includes a time-frequency resource for carrying a synchronization signal/broadcast channel block SSB or a reserved time-frequency resource, the sixth time-frequency resource includes a seventh time-frequency resource, and the seventh time-frequency resource is located in the first time-frequency resource and is the same as a time-domain different frequency domain occupied by the third time-frequency resource.

18. The apparatus of claim 17, wherein the sixth time-frequency resource further comprises a time-frequency resource of the second time-frequency resource other than the third time-frequency resource.

19. The apparatus of claim 17, wherein the processing module is further configured to:

and receiving the downlink data from the network equipment on an eighth time-frequency resource by the transceiver module, wherein the eighth time-frequency resource is a time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource.

20. The apparatus of any one of claims 17 to 19, wherein the processing module is further configured to:

21. A communication device, the device comprising:

the receiving and transmitting module is used for sending first indication information to the terminal equipment, wherein the first indication information is used for indicating first time-frequency resources, the first time-frequency resources are used for bearing downlink data, and the time-frequency resources used for bearing demodulation reference signals for demodulating the downlink data are second time-frequency resources;

and the processing module is configured to send, if the second time-frequency resource and the third time-frequency resource overlap in time domain, the demodulation reference signal to the terminal device through the transceiver module on a sixth time-frequency resource, where the third time-frequency resource includes a time-frequency resource for carrying a synchronization signal/broadcast channel block SSB or a reserved time-frequency resource, the sixth time-frequency resource includes a seventh time-frequency resource, and the seventh time-frequency resource is located in the first time-frequency resource and is the same as a time domain and a different frequency domain occupied by the third time-frequency resource.

22. The apparatus of claim 21, wherein the sixth time-frequency resource further comprises a time-frequency resource of the second time-frequency resource other than the third time-frequency resource.

23. The apparatus of claim 21, wherein the processing module is further configured to:

and transmitting the downlink data to the terminal equipment on an eighth time-frequency resource by the transceiver module, wherein the eighth time-frequency resource is a time-frequency resource except the third time-frequency resource and the seventh time-frequency resource in the first time-frequency resource.

24. The apparatus of any one of claims 21 to 23, wherein the processing module is further configured to:

25. A communication apparatus, the apparatus comprising at least one processor coupled with at least one memory:

The at least one processor configured to execute a computer program or instructions stored in the at least one memory to cause the apparatus to perform the method of any one of claims 1 to 12.

26. A computer-readable storage medium, in which a computer program or instructions is stored which, when read and executed by a computer, cause the computer to perform the method of any one of claims 1 to 12.