CN115484006A

CN115484006A - Communication method and device

Info

Publication number: CN115484006A
Application number: CN202110602670.0A
Authority: CN
Inventors: 宣一荻; 谢信乾; 郭志恒
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-12-16
Also published as: WO2022253166A1

Abstract

The application provides a communication method and a device, and the method comprises the following steps: the method comprises the steps that terminal equipment receives first indication information from network equipment, wherein the first indication information is used for indicating that no demodulation reference signal (DMRS) is loaded on first time-frequency resources or no DMRS is loaded on time-frequency resources corresponding to partial frequency resources in the first time-frequency resources, and the terminal equipment receives data signals on the first time-frequency resources; the terminal equipment acquires DMRS information associated with the data signal and demodulates the data signal according to the DMRS information. According to the method, the first time-frequency resource is indicated to not bear the DMRS (demodulation reference signal) through the indication information, or the time-frequency resource corresponding to part of the frequency domain resources in the first time-frequency resource is not borne the DMRS, so that the flexible configuration of the DMRS can be realized, the expenditure of the DMRS is reduced, the resources for data transmission are saved, and the efficiency for data transmission is improved.

Description

Communication method and device

Technical Field

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

Background

In a wireless communication system, in order to correctly acquire transmission data, a terminal device needs to obtain a channel coefficient of a transmission channel by means of a demodulation reference signal (DMRS) to perform channel estimation to correctly demodulate the transmitted data.

Currently, when a network device transmits downlink data to a terminal device, each time slot of a downlink signal scheduled by Downlink Control Information (DCI) sent by the network device includes a DMRS, but for a fixed access scenario in which a channel is slowly changed, since the channel is basically the same in a plurality of consecutive time slots, if each downlink signal scheduled by the DCI includes the DMRS, transmission overhead of the DMRS is too large. Therefore, how to implement flexible indication of the DMRS through Downlink Control Information (DCI) according to time-frequency resource configuration of the DMRS under the condition that the DMRS is not configured in a part of time slots is an urgent problem to be solved.

Disclosure of Invention

The application provides a communication method and device, which can realize flexible configuration and indication of DMRS and further reduce the overhead of the DMRS.

In a first aspect, a method of communication is provided, where the method may be performed by a terminal device, or may also be performed by a chip or a circuit configured in the terminal device, and this application is not limited thereto. The method comprises the following steps: the method comprises the steps that terminal equipment receives first indication information from network equipment, wherein the first indication information is used for indicating that the number of Code Division Multiplexing (CDM) groups of DMRS which are not used for carrying data on a first time-frequency resource is 0, or the first indication information is used for indicating that the number of time-domain symbols corresponding to the DMRS on the first time-frequency resource is 0, and the first time-frequency resource comprises at least one first time slot in the time domain; and the terminal equipment receives a data signal on the first time-frequency resource, wherein the first time-frequency resource does not carry the DMRS.

Based on the scheme, the indication information indicates that the DMRS is not loaded on the current time-frequency resource, so that the flexible configuration of the DMRS can be realized, and the overhead of the DMRS is reduced.

With reference to the first aspect, in some implementations of the first aspect, the terminal device obtains at least one DMRS, where the at least one DMRS is carried on a second time-frequency resource, and the second time-frequency resource includes at least one second time slot in a time domain, a frequency domain resource of the second time-frequency resource is the same as a frequency domain resource of the first time-frequency resource, and the at least one second time slot and the at least one first time slot are in one uplink and downlink time slot configuration period; and the terminal equipment demodulates the data signal according to the at least one DMRS.

Based on the above scheme, by obtaining the DMRS related to the data carried on the first time-frequency resource, when the DMRS is not carried on the first time-frequency resource, the demodulation of the data signal on the first time-frequency resource can be achieved.

With reference to the first aspect, in some implementations of the first aspect, the second timeslot is any timeslot that is before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the first aspect, in certain implementations of the first aspect, the terminal device receives downlink control information, where the downlink control information is used to schedule the terminal device to receive the at least one DMRS in the second time slot.

With reference to the first aspect, in certain implementations of the first aspect, the first indication information is further used to indicate at least one DMRS port, the at least one DMRS port being associated with a data signal carried on the first time-frequency resource; and the terminal equipment acquires at least one DMRS of the at least one DMRS port.

In a second aspect, a method for communication is provided, where the method may be performed by a terminal device, or may also be performed by a chip or a circuit configured in the terminal device, and this application is not limited in this respect. The method comprises the following steps: the method comprises the steps that terminal equipment receives first indication information from network equipment, wherein the first indication information is used for indicating that no DMRS is loaded on a time-frequency resource corresponding to a first frequency-domain resource in first time-frequency resources, the first frequency-domain resource is a part of frequency-domain resources in the first time-frequency resources, and the first time-frequency resources comprise at least one first time slot in a time domain; and the terminal equipment receives a data signal on the first time-frequency resource.

Based on the scheme, the indication information indicates that the time-frequency resources corresponding to part of the frequency-domain resources are not loaded with the DMRS, so that the flexible configuration of the DMRS can be realized, and the overhead of the DMRS is reduced.

With reference to the second aspect, in certain implementations of the second aspect, the terminal device obtains at least one DMRS, where the at least one DMRS is carried on a second time-frequency resource, the second time-frequency resource includes at least one second time slot in a time domain, the frequency-domain resource of the second time-frequency resource is the same as the first frequency-domain resource, and the at least one second time slot and the at least one first time slot are in a single uplink and downlink time slot configuration period; and the terminal equipment demodulates the data signal corresponding to the first frequency domain resource in the data signal according to the at least one DMRS.

Based on the above scheme, by obtaining the DMRS related to the data carried on the first time-frequency resource, when part of the frequency domain resources of the first time-frequency resource do not carry the DMRS, the demodulation of the data signal on the first time-frequency resource can be achieved.

With reference to the second aspect, in some implementations of the second aspect, the second timeslot is any timeslot before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the second aspect, in certain implementations of the second aspect, the terminal device receives downlink control information, where the downlink control information is used to schedule the terminal device to receive the at least one DMRS in the second time slot.

With reference to the second aspect, in some implementations of the second aspect, the terminal device receives second indication information indicating at least one DMRS port associated with a data signal carried on the first time-frequency resource; and the terminal equipment acquires at least one DMRS of the at least one DMRS port.

In a third aspect, a method of communication is provided, where the method may be performed by a terminal device, or may also be performed by a chip or a circuit configured in the terminal device, and this is not limited in this application. The method comprises the following steps: a terminal device receives first indication information from a network device, where the first indication information is used to indicate that a DMRS is not loaded on a first time-frequency resource, and the first indication information is further used to indicate a second time slot, where the first time-frequency resource includes a first time slot in a time domain, the DMRS loaded on a second time-frequency resource corresponding to the second time slot is associated with the data signal loaded on the first time-frequency resource, the second time-frequency resource includes the second time slot in the time domain, a frequency domain resource of the second time-frequency resource is the same as a frequency domain resource of the first time-frequency resource, and the second time slot and the first time slot are in an uplink and downlink time slot configuration period; and the terminal equipment receives a data signal on the first time-frequency resource.

Based on the above scheme, by obtaining the DMRS related to the data carried on the first time-frequency resource, the demodulation of the data signal on the first time-frequency resource may be achieved when the DMRS is not carried on the first time-frequency resource.

With reference to the third aspect, in some implementations of the third aspect, the terminal device obtains the DMRS carried on the second time-frequency resource; and the terminal equipment demodulates the data information according to the DMRS loaded on the second time frequency resource.

With reference to the third aspect, in some implementations of the third aspect, the second timeslot is a timeslot that is before the first timeslot in the uplink and downlink timeslot configuration period.

In a fourth aspect, a method of communication is provided, where the method may be performed by a network device, or may also be performed by a chip or a circuit configured in the network device, and this application is not limited thereto. The method comprises the following steps: the method comprises the steps that a network device sends first indication information to a terminal device, wherein the first indication information is used for indicating that the number of Code Division Multiplexing (CDM) groups of a DMRS which is not used for carrying data on a first time-frequency resource is 0, or the first indication information is used for indicating that the number of time domain symbols corresponding to the DMRS on the first time-frequency resource is 0, wherein the first time-frequency resource comprises at least one first time slot in the time domain; the network device transmits a data signal on the first time-frequency resource.

With reference to the fourth aspect, in some implementations of the fourth aspect, the network device sends, to the terminal device, at least one DMRS for demodulating the data signal, where the at least one DMRS is carried on a second time-frequency resource, and the second time-frequency resource includes, in a time domain, at least one second time slot, and a frequency-domain resource of the second time-frequency resource is the same as a frequency-domain resource of the first time-frequency resource, and the at least one second time slot and the at least one first time slot are in an uplink and downlink slot configuration period.

With reference to the fourth aspect, in some implementations of the fourth aspect, the second timeslot is any timeslot before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the fourth aspect, in some implementations of the fourth aspect, the network device sends downlink control information to the terminal device, where the downlink control information is used to schedule the terminal device to receive the at least one DMRS in the second time slot.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the first indication information is further used to indicate at least one DMRS port associated with a data signal carried on the first time-frequency resource; the network device transmits the at least one DMRS of the at least one DMRS port to the terminal device.

In a fifth aspect, a method for communication is provided, where the method may be performed by a network device, or may also be performed by a chip or a circuit configured in the network device, and this application is not limited in this respect. The method comprises the following steps: the method comprises the steps that network equipment sends first indication information to terminal equipment, wherein the first indication information is used for indicating that no DMRS is loaded on a time-frequency resource corresponding to a first frequency-domain resource in first time-frequency resources, the first frequency-domain resource is a part of frequency-domain resources in the first time-frequency resources, and the first time-frequency resources comprise at least one first time slot in a time domain; and the network equipment transmits a data signal on the first time-frequency resource.

Based on the above scheme, by obtaining the DMRS related to the data carried on the first time-frequency resource, the demodulation of the data signal on the first time-frequency resource may be implemented when no DMRS is carried on part of the frequency-domain resources of the first time-frequency resource.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further comprises: the network equipment sends at least one DMRS to the terminal equipment, the at least one DMRS is used for demodulating a data signal corresponding to a first frequency domain resource in the data signal, the at least one DMRS is carried on a second time frequency resource, the second time frequency resource comprises at least one second time slot in a time domain, the frequency domain resource of the second time frequency resource is the same as the first frequency domain resource, and the at least one second time slot and the at least one first time slot are in an uplink and downlink time slot configuration period.

With reference to the fifth aspect, in some implementations of the fifth aspect, the second timeslot is any timeslot before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further comprises: and the network equipment sends downlink control information to the terminal equipment, wherein the downlink control information is used for scheduling the terminal equipment to receive the at least one DMRS in the second time slot.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the method further comprises: the network equipment sends second indication information to the terminal equipment, wherein the second indication information is used for indicating at least one DMRS port, and the at least one DMRS port is associated with a data signal loaded on the first time-frequency resource; the network device transmits the at least one DMRS of the at least one DMRS port to the terminal device.

In a sixth aspect, a method for communication is provided, where the method may be performed by a network device, or may also be performed by a chip or a circuit configured in the network device, and this application is not limited in this respect. The method comprises the following steps: the method comprises the steps that network equipment sends first indication information to terminal equipment, wherein the first indication information is used for indicating that no DMRS is loaded on a first time-frequency resource, and the first indication information is also used for indicating a second time slot, the first time-frequency resource comprises a first time slot in a time domain, the DMRS loaded on a second time-frequency resource corresponding to the second time slot is associated with a data signal loaded on the first time-frequency resource, the second time-frequency resource comprises a second time slot in the time domain, the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, and the second time slot and the first time slot are in an uplink and downlink time slot configuration period; the network device transmits a data signal on the first time-frequency resource.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the method further includes: and the network equipment sends the DMRS loaded on the second time-frequency resource to the terminal equipment.

With reference to the sixth aspect, in some implementations of the sixth aspect, the second timeslot is a timeslot before the first timeslot in the uplink and downlink timeslot configuration period.

In a seventh aspect, an apparatus for communication is provided, which may be a terminal apparatus or a terminal device.

The device includes: a transceiver module, configured to receive first indication information from a network device, where the first indication information is used to indicate that a number of code division multiplexing, CDM, groups of a DMRS that is not used for carrying data on a first time-frequency resource is 0, or the first indication information is used to indicate that a number of time-domain symbols corresponding to the DMRS on the first time-frequency resource is 0, where the first time-frequency resource includes at least one first slot in a time domain; the transceiver module is further configured to receive a data signal on the first time-frequency resource, where the first time-frequency resource does not carry the DMRS.

Based on the beneficial effects of the foregoing schemes, reference may be made to the corresponding description of the first aspect, and for brevity, this application is not described herein again.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the apparatus further includes: a processing module, configured to obtain at least one DMRS, where the at least one DMRS is loaded on a second time-frequency resource, and the second time-frequency resource includes at least one second time slot in a time domain, the frequency-domain resource of the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, and the at least one second time slot and the at least one first time slot are in an uplink and downlink time slot configuration period; the processing module is further configured to demodulate the data signal according to the at least one DMRS.

With reference to the seventh aspect, in some implementations of the seventh aspect, the second timeslot is any timeslot that is before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver module is further configured to receive downlink control information, where the downlink control information is used to schedule the transceiver module to receive the at least one DMRS in the second time slot.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the first indication information is further used to indicate at least one DMRS port, where the at least one DMRS port is associated with a data signal carried on the first time-frequency resource, and the processing module is specifically configured to: obtaining at least one DMRS of the at least one DMRS port.

In an eighth aspect, an apparatus for communication is provided, which may be a terminal apparatus or a terminal device.

The device includes: a transceiver module, configured to receive first indication information from a network device, where the first indication information is used to indicate that no DMRS is loaded on a time-frequency resource corresponding to a first frequency-frequency resource in first time-frequency resources, and the first frequency-frequency resource is a partial frequency-frequency resource in the first time-frequency resources, where the first time-frequency resource includes at least one first time slot in a time domain; the transceiver module is further configured to receive a data signal on the first time-frequency resource.

Based on the beneficial effects of the foregoing schemes, reference may be made to the corresponding description of the second aspect, and for brevity, this application is not described herein again.

With reference to the eighth aspect, in certain implementations of the eighth aspect, the apparatus further includes: a processing module, configured to obtain at least one DMRS, where the at least one DMRS is loaded on a second time-frequency resource, and the second time-frequency resource includes at least one second time slot in a time domain, the frequency-domain resource of the second time-frequency resource is the same as the first frequency-domain resource, and the at least one second time slot and the at least one first time slot are in an uplink and downlink time slot configuration cycle; the processing module is further configured to demodulate a data signal corresponding to a first frequency domain resource in the data signal according to the at least one DMRS.

With reference to the eighth aspect, in some implementations of the eighth aspect, the second timeslot is any timeslot before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the eighth aspect, in some implementations of the eighth aspect, the transceiver module is further configured to receive downlink control information, where the downlink control information is used to schedule the transceiver module to receive the at least one DMRS in the second time slot.

With reference to the eighth aspect, in some implementations of the eighth aspect, the terminal device receives second indication information, where the second indication information is used to indicate at least one DMRS port, and the at least one DMRS port is associated with a data signal carried on the first time-frequency resource, and the processing module is specifically configured to: obtaining at least one DMRS of the at least one DMRS port.

In a ninth aspect, a communication apparatus is provided, which may be a terminal apparatus or a terminal device.

The device includes: a transceiver module, configured to receive first indication information from a network device, where the first indication information is used to indicate that no DMRS is loaded on a first time-frequency resource, and the first indication information is also used to indicate a second time slot, where the first time-frequency resource includes a first time slot in a time domain, the DMRS loaded on a second time-frequency resource corresponding to the second time slot is associated with the data signal loaded on the first time-frequency resource, the second time-frequency resource includes the second time slot in the time domain, a frequency domain resource of the second time-frequency resource is the same as a frequency domain resource of the first time-frequency resource, and the second time slot and the first time slot are in an uplink and downlink time slot configuration period; the transceiver module is further configured to receive a data signal on the first time-frequency resource.

Based on the beneficial effects of the above scheme, reference may be made to the corresponding description of the third aspect, and for brevity, this application is not described herein again.

With reference to the ninth aspect, in certain implementations of the ninth aspect, the apparatus further includes: the processing module is used for acquiring the DMRS loaded on the second time frequency resource; and the processing module is further configured to demodulate the data information according to the DMRS carried on the second time-frequency resource.

With reference to the ninth aspect, in some implementations of the ninth aspect, the second timeslot is a timeslot before the first timeslot in the uplink and downlink timeslot configuration period.

In a tenth aspect, an apparatus for communication is provided, which may be a network apparatus or a network device. The device comprises: a transceiver module, configured to send first indication information to a terminal device, where the first indication information is used to indicate that a number of code division multiplexing, CDM, groups of a DMRS that is not used for carrying data on a first time-frequency resource is 0, or the first indication information is used to indicate that a number of time-domain symbols corresponding to the DMRS on the first time-frequency resource is 0, where the first time-frequency resource includes at least one first slot in a time domain; the transceiver module is further configured to send a data signal on the first time-frequency resource.

Based on the beneficial effects of the foregoing scheme, reference may be made to the corresponding description of the fourth aspect, and for brevity, this application is not described herein again.

With reference to the tenth aspect, in some implementations of the tenth aspect, the transceiver module is configured to transmit at least one DMRS to the terminal device, where the at least one DMRS is used to demodulate the data signal, and the at least one DMRS is carried on a second time-frequency resource, and the second time-frequency resource includes at least one second time slot in a time domain, the frequency-domain resource of the second time-frequency resource is the same as the frequency-domain resource of the first time-frequency resource, and the at least one second time slot and the at least one first time slot are in one uplink and downlink time slot configuration period.

With reference to the tenth aspect, in some implementations of the tenth aspect, the second timeslot is any timeslot that is before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the tenth aspect, in some implementations of the tenth aspect, the transceiver module is configured to send downlink control information to the terminal device, where the downlink control information is used to schedule the terminal device to receive the at least one DMRS in the second time slot.

With reference to the tenth aspect, in certain implementations of the tenth aspect, the first indication information is further used to indicate at least one DMRS port associated with a data signal carried on the first time-frequency resource; the transceiver module is specifically configured to transmit the at least one DMRS of the at least one DMRS port to the terminal device.

In an eleventh aspect, an apparatus for communication is provided, which may be a network apparatus or a network device.

The device includes: a transceiver module, configured to send first indication information to a terminal device, where the first indication information is used to indicate that a time-frequency resource corresponding to a first frequency-domain resource in a first time-frequency resource does not carry a DMRS, and the first frequency-domain resource is a part of frequency-domain resources in the first time-frequency resource, where the first time-frequency resource includes at least one first time slot in a time domain; the transceiver module is further configured to transmit a data signal on the first time-frequency resource.

Based on the beneficial effects of the foregoing schemes, reference may be made to the corresponding description of the fifth aspect, and for brevity, this application is not described herein again.

With reference to the eleventh aspect, in some implementations of the eleventh aspect, the transceiver module is further configured to transmit at least one DMRS to the terminal device, where the at least one DMRS is used to demodulate a data signal corresponding to a first frequency-domain resource in the data signal, and the at least one DMRS is carried on a second time-frequency resource, and the second time-frequency resource includes at least one second time slot in a time domain, the frequency-domain resource of the second time-frequency resource is the same as the first frequency-domain resource, and the at least one second time slot and the at least one first time slot are in one uplink and downlink time slot configuration period.

With reference to the eleventh aspect, in some implementations of the eleventh aspect, the second timeslot is any timeslot that is before the first timeslot in the uplink and downlink timeslot configuration period.

With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the apparatus further includes: and the transceiver module is configured to send downlink control information to the terminal device, where the downlink control information is used to schedule the terminal device to receive the at least one DMRS in the second time slot.

With reference to the eleventh aspect, in certain implementations of the eleventh aspect, the transceiver module is configured to transmit second indication information to the terminal device, where the second indication information indicates at least one DMRS port, and the at least one DMRS port is associated with a data signal carried on the first time-frequency resource; the network device transmits the at least one DMRS of the at least one DMRS port to the terminal device.

In a twelfth aspect, an apparatus for communication is provided, which may be a network apparatus or a network device.

The device includes: a transceiver module, configured to send first indication information to a terminal device, where the first indication information is used to indicate that a DMRS is not loaded on a first time-frequency resource, and the first indication information is further used to indicate a second time slot, where the first time-frequency resource includes a first time slot in a time domain, the DMRS loaded on a second time-frequency resource corresponding to the second time slot is associated with the data signal loaded on the first time-frequency resource, the second time-frequency resource includes the second time slot in the time domain, a frequency-domain resource of the second time-frequency resource is the same as a frequency-domain resource of the first time-frequency resource, and the second time slot and the first time slot are in an uplink and downlink time slot configuration period; the transceiver module is further configured to transmit a data signal on the first time-frequency resource.

Based on the beneficial effects of the foregoing schemes, reference may be made to the corresponding description of the sixth aspect, and for brevity, this application is not described herein again.

With reference to the twelfth aspect, in some implementations of the twelfth aspect, the transceiver module is configured to send, to the terminal device, the DMRS carried on the second time-frequency resource.

With reference to the twelfth aspect, in some implementations of the twelfth aspect, the second timeslot is a timeslot that is before the first timeslot in the uplink and downlink timeslot configuration period.

In a thirteenth aspect, an apparatus for communication is provided, which is configured to perform the methods provided in the first to third aspects. In particular, the apparatus may comprise means and/or modules, such as processing modules and/or transceiver modules, for performing the methods provided by the first to third aspects.

In one implementation, the apparatus is a terminal device. When the device is a terminal device, the communication module may be a transceiver, or an input/output interface; the processing module may be a processor.

In another implementation, the apparatus is a chip, a system of chips, or a circuit for use in a terminal device. When the device is a chip, a system of chips or a circuit in a device for switching a carrier, the transceiver module unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the system of chips or the circuit; the processing module may be a processor, a processing circuit, a logic circuit, or the like.

Based on the beneficial effects of the above scheme, reference may be made to the corresponding descriptions of the first to third aspects, and for brevity, the description of this application is not repeated herein.

Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In a fourteenth aspect, an apparatus for communication is provided, which is configured to perform the method provided in the fourth to sixth aspects. In particular, the apparatus may comprise means and/or modules, such as processing means and/or transceiver means, for performing the methods provided by the fourth to sixth aspects.

In one implementation, the apparatus is a network device. When the device is a network device, the transceiver module may be a transceiver, or an input/output interface; the processing module may be a processor.

In another implementation, the apparatus is a chip, a system of chips, or a circuit for use in a network device. When the device is a chip, a system of chips or a circuit in a device for switching a carrier, the transceiver module unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the system of chips or the circuit; the processing module may be a processor, processing circuitry, logic circuitry, or the like.

Based on the beneficial effects of the foregoing schemes, reference may be made to the corresponding descriptions of the fourth to sixth aspects, and for brevity, the description of the present application is not repeated herein.

In a fifteenth aspect, a communication device is provided, the device comprising: a memory for storing a program; a processor for executing the memory-stored program, the processor being configured to perform the methods provided in the first to sixth aspects described above when the memory-stored program is executed.

In one implementation, the apparatus is a terminal device or a network device.

In another implementation, the apparatus is a chip, a system of chips, or a circuit used in a terminal device or a network device.

In a sixteenth aspect, the present application provides a processor for performing the method provided by the above aspects. In the course of performing these methods, the processes of the above-mentioned methods regarding the transmission of the above-mentioned information and the acquisition/reception of the above-mentioned information may be understood as a process of outputting the above-mentioned information by a processor, and a process of receiving the above-mentioned information inputted by a processor. Upon outputting the information, the processor outputs the information to the transceiver for transmission by the transceiver. This information may also require additional processing after being output by the processor before reaching the transceiver. Similarly, when the processor receives the input information, the transceiver acquires/receives the information and inputs the information into the processor. Further, after the transceiver receives the information, the information may need to be processed before being input to the processor.

The operations relating to the processor, such as transmitting, sending and acquiring/receiving, may be understood more generally as operations relating to processor output and receiving, input, etc., rather than operations relating directly to transmitting, sending and receiving by the rf circuitry and antenna, if not specifically stated or if not contradicted by their actual role or inherent logic in the associated description.

In implementation, the processor may be a processor dedicated to performing the methods, or may be a processor, such as a general-purpose processor, that executes computer instructions in a memory to perform the methods. The Memory may be a non-transitory Memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor or disposed on different chips, and the embodiment of the present invention is not limited to the type of the Memory and the arrangement manner of the Memory and the processor.

A seventeenth aspect provides a computer-readable storage medium storing program code for execution by a device, the program code comprising instructions for performing the methods provided by the first through sixth aspects above.

In an eighteenth aspect, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the method provided in the first to the sixth aspect described above.

Nineteenth aspect provides a chip, the chip comprises a processor and a communication interface, the processor reads instructions stored on a memory through the communication interface, and executes the methods provided by the first to sixth aspects.

Optionally, as an implementation manner, the chip may further include a memory, where the memory stores instructions, and the processor is configured to execute the instructions stored on the memory, and when the instructions are executed, the processor is configured to execute the methods provided in the first aspect to the sixth aspect.

Drawings

Fig. 1 illustrates an exemplary architecture diagram of a communication system 100 of one embodiment of the present application.

Fig. 2 shows a schematic diagram of DMRS configuration on a first time-frequency resource provided by the present application.

Fig. 3 is a flowchart illustrating a method 300 for communication according to an embodiment of the present application.

Fig. 4 is a flowchart illustrating a method 400 for demodulating a data signal according to an embodiment of the present application.

Fig. 5 is a schematic diagram illustrating a relationship between a first time slot and a second time slot according to an embodiment of the present application.

Fig. 6 is a flowchart illustrating a method 600 of communication according to an embodiment of the present application.

Fig. 7 is a flowchart illustrating a method 700 for communication according to an embodiment of the present application.

Fig. 8 illustrates a schematic diagram of a relationship between a first time slot and a second time slot according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of an example of a network device of the present application.

Fig. 10 is a schematic block diagram of an example of a terminal device of the present application.

Fig. 11 is a schematic diagram of a communication device according to an embodiment of the present application.

Fig. 12 is a schematic diagram of a communication device according to another example of the present application.

Fig. 13 is a schematic configuration diagram of a terminal device of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD) System, a Universal Mobile Telecommunications System (UMTS) System, a Worldwide Interoperability for Microwave Access (WiMAX) communication System, a fifth generation (5G) System or a New Radio System (NR), a next generation communication System (e.g., a 6G System), a Multiple Access System, or a converged communication System.

Terminal equipment in embodiments of the present application may refer to user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G Network or a terminal device in a next generation communication system (e.g., a 6G communication system), or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment.

The Network device in this embodiment may be a device for communicating with a terminal device, and the Network device may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) System or a Code Division Multiple Access (CDMA) System, may also be a Base Station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) System, may also be an evolved node b (eNB, or eNodeB) in an LTE System, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay Station, an Access point, a vehicle-mounted device, a wearable device, a Network device in a 5G Network or a Network device in a next-generation communication System (e.g., a 6G communication System), or a Network device in a PLMN Network in the future, and the like, and the embodiments of the present invention are not limited.

Fig. 1 is an exemplary architecture diagram of a communication system 100 of one embodiment of the present application. The method in the embodiment of the present application may be applied to the communication system 100 shown in fig. 1. It should be understood that more network devices or terminal devices may be included in the communication system 100 to which the methods of the embodiments of the present application may be applied.

The network device or the terminal device in fig. 1 may be hardware, or may be functionally divided into software, or a combination of the two. The network devices or terminal devices in fig. 1 may communicate with each other through other devices or network elements.

In the communication system 100 shown in fig. 1, a network device 110 and a terminal device 101 constitute one communication system 100. In this communication system 100, the network device 110 can transmit downlink data to the terminal devices 101 to 106. It should be appreciated that terminal device 101 may be, for example, a cellular telephone, a smart phone, a laptop computer, a handheld communication device, a handheld computing device, a satellite radio, a global positioning system, a Personal Digital Assistant (PDA), and/or any other suitable device for communicating over wireless communication system 100.

The communication system 100 may be a PLMN network, a device-to-device (D2D) network, a machine-to-machine (M2M) network, an internet of things (IoT), or other networks.

For ease of understanding, some of the terms appearing herein are introduced:

1. subcarrier: in an Orthogonal Frequency Division Multiplexing (OFDM) system, a frequency domain resource is divided into a plurality of sub-resources, and a sub-resource in each frequency domain may be referred to as a sub-carrier. The subcarriers may also be understood as the smallest granularity of frequency domain resources.

2. Subcarrier spacing: in the OFDM system, the value of the interval between the center positions or peak positions of two subcarriers adjacent in the frequency domain. For example, the subcarrier spacing in the LTE system is 15kHz, the subcarrier spacing in the NR system in the 5G system may be 15kHz, or 30kHz, or 60kHz, or 120kHz, or the like.

3. Resource block: the N subcarriers consecutive in the frequency domain may be referred to as one resource block. For example, one resource block in the LTE system includes 12 subcarriers, and one resource block in the NR system in 5G also includes 12 subcarriers. As the communication system evolves, the number of subcarriers included in one resource block may be other values.

4. Time slot: in the 5G NR system, one time slot comprises 14 OFDM symbols, the time slot length corresponding to the 15kHz subcarrier interval is 1ms, and the time slot length corresponding to the 30kHz subcarrier interval is 0.5ms.

5. And a subframe: the time length of one subframe in the 5G NR system is 1ms.

6. OFDM symbol: the smallest time unit in the time domain in an OFDM system.

7. Time-frequency resource unit: the minimum resource granularity in the OFDM system is one OFDM symbol in the time domain and one subcarrier in the frequency domain.

8. Antenna port: in the 5G NR system, antenna ports are logical ports for transmission, and one antenna port includes a plurality of physical antennas. From the perspective of the receiving end, each antenna port corresponds to an independent wireless channel.

9. DMRS: the DMRS is a signal known to a receiving end, and the receiving end may determine a fading characteristic of a wireless channel, that is, a channel coefficient of the wireless channel, according to the received signal and the known DMRS signal, and is used to recover the received signal. In the 5G NR system, considering that channel coefficients from different antenna ports to a terminal are different, in order for a receiving end to obtain information transmitted on multiple spatial layers, it is necessary to estimate a channel coefficient between each antenna port and the terminal, so that it is necessary to configure a different DMRS for each antenna port, and DMRSs corresponding to different antenna ports may be multiplexed by using time division, frequency division, code division, and the like. Currently, a maximum of 12 MDRS ports can be supported by a 5G NR system.

10. Spatial layer: in an existing wireless communication system, a base station is equipped with multiple antennas to implement spatial multiplexing transmission by using a multiple-input multiple-output (MIMO) technology, that is, multiple uncorrelated data streams are transmitted on the same time-frequency resource, each uncorrelated data stream is transmitted on an independent spatial layer, and each spatial layer is mapped to a different antenna port for transmission.

11. Resource Block Group (RBG): one or more resource blocks constitute an RBG. The size of the RBG is configured in the 5G NR through a high-layer parameter.

11. Partial Bandwidth (Bandwidth Part, BWP): in 5G NR, a terminal device may be configured with a portion of the frequency domain resources in a carrier for data transmission, without requiring all of the frequency domain resources in the carrier.

12. A fixed access scenario: fixed Wireless Access (FWA) networks relying on Long Term Evolution (LTE) and 5G NR (NR) technologies provide Wireless or limited lan Access to end users through Customer Premises Equipment (CPE) indoors or outdoors. The CPE can provide a plurality of services such as internet, fixed telephone, television, intelligent home and the like for the end user.

13. Slowly varying channels in fixed wireless access scenarios: in the FWA scenario, the CPE device is fixed-position mounted, and its channel state can theoretically be kept constant without moving reflectors around. However, considering the influence of the moving reflectors around, the channel state cannot be assumed as completely stationary even for a terminal with a fixed position. Based on the results of the external field channel test, it has been preliminarily concluded that: for typical Non-Line-of-Sight (NLOS) and Line-of-Sight (LOS) channel environments, the channel variation of a fixed-location terminal may be assumed at a moving speed of 1 km/h. Therefore, for a fixed-location terminal, the channel variation amplitude in a plurality of consecutive time slots is lower than that of a mobile terminal, that is, for a fixed-location terminal, the channel is slowly changed in the time domain.

Fig. 2 shows a schematic diagram of DMRS configuration on a first time-frequency resource provided in the present application.

It should be noted that, in this application, the first time-frequency resource is used for carrying a data signal, the time domain of the first time-frequency resource may include at least one time slot, and the frequency domain resource includes frequency domain resources under all time domain symbols of the at least one time slot. It should be understood that, in the present application, receiving a data signal on a first time frequency resource may be understood as receiving a physical downlink shared channel on the first time frequency resource, or may be understood as receiving data on a physical downlink shared channel on the first time frequency resource. The physical downlink shared channel may include all of the frequency domain resources of the first time-frequency resource in the frequency domain, and may include only a part of the time domain resources of the first time-frequency resource in the time domain. The portion of the time domain resource of the first time frequency resource may be a time domain resource allocated by the network device to the scheduled terminal device, that is, may be indicated by indication information (for example, indication information carried in a time domain resource allocation field of DCI) for the network device to the terminal device. Alternatively, in this application, receiving a data signal on a first time-frequency resource may also be understood as receiving a plurality of physical downlink shared channels on the first time-frequency resource, or may also be understood as receiving data on a plurality of physical downlink shared channels on the first time-frequency resource. Any one of the physical downlink shared channels may include, in a frequency domain, all of the frequency domain resources of the first time-frequency resource, and may include, in a time domain, only a portion of the time domain resources of the first time-frequency resource. The portion of the time domain resource of the first time frequency resource may be the time domain resource allocated by the network device to the scheduled terminal device, that is, the portion may be indicated by the network device to the terminal device through indication information (for example, a time domain resource allocation field in DCI).

For example, if the first time-frequency resource includes one time slot, the first time-frequency resource may be represented as (a) in fig. 2.

When the first time-frequency resource is configured as one slot in the time domain, the DMRS configuration on the first time-frequency resource may be denoted as (b) and (c) in this application. In the step (b), DMRS is not carried on the time-frequency resources corresponding to all the frequency-domain resources. (c) It is shown that the DMRS is not carried on the time-frequency resource corresponding to the first frequency-frequency resource in the first time-frequency resources. It should be understood that the DMRS in (c) may be carried on time-frequency resources other than the first frequency-domain resource, that is, the DMRS in (c) may be carried on time-frequency resources corresponding to other time-domain symbols without changing frequency domain. In addition, the frequency domain range of the first frequency domain resource may also be changed, and the present application is not limited to this, and all of the frequency domain ranges may be within the protection scope of the present application.

It should be understood that fig. 2 is only an example, and is also within the scope of the present application when the first time-frequency resource includes a plurality of time slots.

To facilitate understanding of the embodiments of the present application, the process of sending the indication information described below may be performed by the network device, or may be performed by a chip configured in the network device. For convenience of description, hereinafter, collectively referred to as network devices.

Fig. 3 is a flowchart illustrating a method 300 of communication according to an embodiment of the present application, where as shown in fig. 3, the method of communication includes:

s301, the network device sends first indication information to the terminal device.

Specifically, the network device sends, to the terminal device, first indication information, where the first indication information is used to indicate that the number of code division multiplexing, CDM, groups of the DMRS that is not used for carrying data on the first time-frequency resource is 0, or the first indication information is used to indicate that the number of time-domain symbols corresponding to the DMRS on the first time-frequency resource is 0. The Code Division Multiplexing (CDM) group of the DMRS can be a preset time-frequency resource which can be used for bearing the DMRS, and a plurality of DMRSs can be transmitted on the time-frequency resource in a code division multiplexing mode. For example, in the NR standard, a CDM group of 2 DMRSs is defined when DMRS type 1 is used, and a CDM group of 3 DMRSs is defined when DMRS type 1 is used. In the NR system, in order to reduce overhead for transmitting the DMRS, the DMRS may not be carried in the code division multiplexing CDM group of the DMRS, and the overall transmission rate may be increased by carrying data in the CDM group of the DMRS. In the existing NR standard, the terminal device may be notified of the number of code division multiplexing CDM groups of the DMRS that are not used for carrying data by means of dynamic indication, where the number of code division multiplexing CDM groups of the DMRS that are not used for carrying data that are dynamically indicated may be 1 and 2 when DMRS type 1 is used, and the number of code division multiplexing CDM groups of the DMRS that are not used for carrying data that are dynamically indicated may be 1, 2, and 3 when DMRS type 1 is used.

Optionally, the first indication information may be carried in DCI.

Optionally, the frequency domain resources included in the first time frequency resources may be indicated by a frequency domain resource allocation field in the DCI.

In a possible implementation manner, when the first indication information is carried in the DCI, the first indication information may be a newly added indication field in the DCI, and the indication field carries the first indication information.

Or, in another possible implementation manner, the first indication information may also multiplex an indication field indicating a DMRS antenna port. Or, the first indication information may include an antenna port field in DCI. For example, the first indication information may be an antenna port field in the existing 3GPP standard TS 38.212.

Specifically, the first indication information may include first sub information and second sub information. The first sub-information is used for indicating a DMRS port associated with a data signal on the first time-frequency resource, and the second sub-information is used for indicating the number of Code Division Multiplexing (CDM) groups of a DMRS that is not used for carrying data on the first time-frequency resource, or the number of time domain symbols corresponding to the DMRS on the first time-frequency resource. It should be understood that, when the second sub-information indicates that the number of code division multiplexing, CDM, groups of the DMRS that are not used for carrying data on the first time-frequency resource is 0, or the second sub-information indicates that the number of time domain symbols corresponding to the DMRS on the first time-frequency resource is 0, it indicates that the DMRS is not carried on the first time-frequency resource, in other words, the first time-frequency resource is all used for carrying data signals, for example, it may be the (b) diagram in fig. 2.

It should be noted that the first time-frequency resource may include at least one time slot.

In a possible implementation manner, the first indication information may indicate an index in a predefined index table, and the index may correspond to the first sub information and the second sub information.

It should be understood that the "predefined" may mean preset, for example, protocol definition, and may be implemented by pre-saving corresponding codes, tables or other manners that may be used to indicate related information in the device, and the specific implementation manner of the present application is not limited thereto.

Alternatively, any index value in the index table may indicate the number of CDM groups and DMRS ports that are not used for DMRSs carrying data. There is at least one first index value in the index table, the index value indicating that the number of CDM groups not used for a DMRS carrying data is 0. Optionally, the DMRS ports indicated by the first index value are the same as the DMRS ports indicated by one or more second index values in the index table. The second index value is one of the other index values in the index table except the at least one first index value.

When the first indication information indicates an index in a predefined index table, for example, the predefined index table may include entries in an antenna port index table in current 3gpp TS 38.212 and entries having a DMRS CDM group number of 0 that is not used for carrying data. Illustratively, entries in the antenna port index Table 7.3.1.2.2-3 of 3gpp ts 38.212 with a single DMRS symbol and DMRS type 1 and 9 entries indicating that the number of CDM groups not used for carrying data is 0, i.e., 12 to 20, may be included in the predefined index Table, which may be the case as shown in Table 1 below.

TABLE 1

It should be noted that, in table 1, at least one DMRS port corresponding to an entry that "CDM group of DMRS not used for carrying data is 0" is the same as at least one DMRS port of an entry that "CDM group of DMRS not used for carrying data is not 0", for example, when an index indicated by the first indication information is 12, the first indication information indicates that all CDM groups of DMRS carried on the first time-frequency resource are used for carrying data, and the indicated antenna port numbers are the same as the antenna port numbers indicated by index value 0 and index value 3. As can be understood, although the DMRS is not carried on the first time-frequency resource, the data signal on the first time-frequency resource still needs to be demodulated, that is, the DMRS related information obtained at the antenna port associated with the first time-frequency resource is needed for demodulation. That is, the first indication information may simultaneously indicate related information of DMRSs used for demodulating the data signal, and may be obtained from a port of the DMRS indicated by the indication information.

Optionally, only one first index value may be included in the index table, where the first index indicates that the number of CDM groups of the DMRS that are not used for carrying data is 0, and the first index value does not indicate a DMRS port. When the terminal device receives the first indication information and the first indication information indicates the first index, the terminal device determines that the DMRS port associated with the data signal carried on the first time-frequency resource is the first DMRS port. The first DMRS port may be a DMRS port associated with a last data signal received by the terminal device. Or the first DMRS ports comprise DMRS ports with indexes of 0 to N-1, wherein N is the number of DMRS ports associated with the last data signal received by the terminal equipment. For example, the index table is shown in table 2. In table 2, index 12 indicates that the number of CDM groups not used for carrying data is 0, and index 12 does not indicate a DMRS port.

TABLE 2

Optionally, the network device may send higher layer signaling, which configures the terminal device to use the predefined index table.

Optionally, the terminal device may transmit capability information to the network device, the capability information indicating that the terminal device has a capability of receiving the data signal on the first time-frequency resource and not receiving the DMRS. This capability may also be understood as the capability of the terminal device to demodulate a data signal without receiving the DMRS on the first time-frequency resource. Further, the terminal device may use the predefined index table if it has the capability.

S302, the network equipment sends a data signal to the terminal equipment.

Specifically, the network device sends the data signal mapped on the first time-frequency resource to the terminal device.

S303, the terminal equipment receives the data signal.

Specifically, the terminal device receives a data signal carried on the first time-frequency resource according to the first indication information.

Based on the scheme, the communication method provided by the application indicates that the current time-frequency resource does not bear the DMRS through the indication information, and can realize flexible configuration of the DMRS, thereby reducing the expense of the DMRS.

Further, the present application also provides a method of demodulating a data signal, as shown in fig. 4.

S401, the terminal equipment acquires at least one DMRS.

Specifically, when the terminal device learns that the DMRS is not carried on the first time-frequency resource according to the first indication information shown in fig. 3, after the terminal device receives the data signal on the first time-frequency resource, the terminal device acquires the DMRS associated with the data signal.

Optionally, the obtaining, by the terminal device, the DMRS associated with the data signal may include obtaining at least one of the following DMRS related information: the signal of the DMRS, the part of the DMRS signal, and the channel estimation result obtained according to the DMRS, wherein the part of the DMRS signal can be the DMRS signal corresponding to one time domain symbol.

In one possible implementation, the terminal device may obtain, in the buffer, the at least one DMRS received in the at least one second slot.

Optionally, the terminal device may receive DCI sent by the network device, where the DCI is used to schedule the DMRS received by the terminal device in the second time slot, or the DCI includes indication information indicating that the DMRS may be received in the second time slot. It should be understood that, in this manner, the second time slot is a time slot that the terminal device indicated by the DCI can perform DMRS reception. Therefore, the terminal equipment acquires the DMRS which is received by the DCI scheduling terminal equipment under the condition that the terminal equipment can only acquire the DCI; if the DCI is lost or the terminal equipment does not demodulate a signal carrying the DCI correctly, so that the DCI which is not received, the terminal equipment cannot receive the corresponding DMRS according to the DCI.

The at least one DMRS acquired by the terminal device may be borne on a second time-frequency resource, where the second time-frequency resource includes at least one second time slot in a time domain. It should be understood that, since the DMRS received by the terminal device is used to demodulate the data signal on the first time-frequency resource, the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, and meanwhile, the at least one second time slot is in one uplink and downlink time slot configuration period as the first time slot in the embodiment shown in fig. 3. That is, when the terminal device can perform demodulation using the acquired DMRS-related information, the phases of the acquired DMRS and the missing DMRS should be kept continuous, and when the acquired DMRS and the DMRS in the missing first slot are in the two uplink and downlink slot configuration periods, the phases are discontinuous.

Optionally, the configuration of the uplink time domain resource and the downlink time domain resource of the terminal device is configured periodically by taking an uplink and downlink time slot configuration period as a unit. For example, in LTE, the uplink and downlink timeslot configuration period may be 5ms or 10ms; in NR, the uplink and downlink timeslot configuration period may be configured by parameters in a high layer signaling, such as dl-UL-transmission periodicity parameter configuration, and meanwhile, in NR, only one uplink and downlink switching point is included in one uplink and downlink timeslot configuration period.

For example, a schematic diagram of the relationship of the first time slot and the second time slot is shown in fig. 5. In fig. 5, the second slot may be any one slot before the first slot.

In (a), the first time slot is located in the 3 rd time slot in the uplink and downlink time slot configuration period, then, both of the first two time slots in the uplink and downlink time slot configuration period may serve as the second time slot, and the terminal device may acquire DMRS information carried on the first time slot to demodulate the data signal carried on the first time-frequency resource, and of course, may also acquire DMRS information carried on the second time slot to demodulate the data signal carried on the first time-frequency resource.

In (b), the first time slot is located in the last time slot in the uplink and downlink time slot configuration period, then, the time slots in the uplink and downlink time slot configuration period except the last time slot may all be regarded as the second time slot, and the terminal device may acquire any one or more DMRSs on the second time slot carrying the DMRS information to demodulate the data signal carried on the first time-frequency resource.

It should be understood that, if the first indication information received by the terminal device is also used to indicate at least one DMRS port, when acquiring the DMRS carried on the second time-frequency resource corresponding to the second time slot, the at least one DMRS information received by the port indicated by the indication information should be used to demodulate the data signal, or the DMRS corresponding to the DMRS port indicated by the indication information should be used to demodulate the data signal.

S402, the terminal equipment demodulates the data signal according to the at least one DMRS.

Specifically, when the terminal device acquires a data signal carried on the first time-frequency resource and acquires at least one DMRS corresponding to the data signal, the terminal device demodulates the data signal using the at least one DMRS.

Based on the above scheme, according to the data demodulation method provided by the application, when the terminal device does not receive the DMRS for demodulating data on the time-frequency resource, the terminal device demodulates the data signal by acquiring at least one DMRS on the second time slot.

It should be understood that the premise that the terminal device can correctly demodulate data by using the DMRS is that the terminal device stores the corresponding DMRS in the second time slot, and therefore, further, in this application, the terminal device needs to store the DMRS carried by the second time-frequency resource. In the application, when the terminal device is in an uplink and downlink timeslot configuration period, if the terminal device receives the DMRS on one time-frequency resource, the terminal device stores the received DMRS. And when the terminal equipment receives the first indication information and determines that the first time-frequency resource does not bear the DMRS, the terminal equipment acquires the DMRS corresponding to the data signal borne on the first time-frequency resource from the cache and demodulates the data signal.

Optionally, the terminal device stores the DMRS in the at least one third time slot. The third time slot is other time slots except the last time slot in the uplink and downlink time slot configuration period. In the first embodiment, when the terminal device receives DCI for scheduling the terminal device to receive the DMRS in the third slot, the terminal device stores the DMRS in the third slot. It is to be understood that the DMRS in the at least one third time slot stored by the terminal device includes the DMRS in the second time slot. Therefore, the terminal device can acquire the DMRS of the second slot in the buffer. In a second implementation manner, the terminal device stores a signal corresponding to the first time domain symbol in each third time slot, where the third time slot is any time slot except the last time slot in the uplink and downlink time slot switching period. It should be understood that the terminal device stores that the signal corresponding to the first time domain symbol in each third slot includes the DMRS in the second slot. Therefore, the terminal device can acquire the DMRS of the second slot in the buffer. The first time domain symbol may be predefined, and DMRS may be carried on time-frequency resources corresponding to the first time domain symbol, for example, DMRS may be carried on time-frequency resources corresponding to 2 nd and 3 rd time domain symbols in one timeslot specified in the NR standard, and thus, the first time domain symbol may be 2 nd and/or 3 rd time domain symbols in the timeslot, and thus, the terminal device may store signals in the 2 nd and/or 3 rd time domain symbols, and use the DMRS in the signals for demodulation of the data signal received in the first time slot.

In addition, in order to save resources, the terminal device may discard the stored DMRSs, that is, empty the DMRSs in the buffer, after one uplink and downlink timeslot configuration period ends. Or, the terminal device only stores the DMRS in the second time slot until the uplink and downlink time slot configuration period where the second time slot is located is finished.

In another possible implementation manner, if the terminal device does not store the DMRS related to the data carried on the first time-frequency resource, or the first time slot corresponding to the first time-frequency resource is located in the first time slot of one uplink and downlink time slot configuration period, or the terminal device is instructed to receive the DCI of the DMRS on the second time-frequency resource and cannot acquire the DMRS, the terminal device does not perform the operation of receiving the data. It should be understood that, at this time, even if the terminal device receives the data signal, the terminal device cannot correctly demodulate the data signal, and therefore, in order to save resources of the terminal device, the terminal device may discard the first indication information and subsequently not receive the data signal sent by the network device.

Optionally, the terminal device may not discard the first indication information, and after receiving the data signal, perform channel estimation and demodulate the data signal by using a blind channel estimation algorithm.

Fig. 6 is a flowchart illustrating a method 600 of communication according to an embodiment of the present application, where as shown in fig. 6, the method of communication includes:

s601, the network device sends first indication information to the terminal device.

Specifically, the network device sends first indication information to the terminal device, where the first indication information is used to indicate that no DMRS is loaded on a time-frequency resource corresponding to a first frequency-frequency resource in the first time-frequency resource, the first frequency-frequency resource is a part of frequency-frequency resources in the first time-frequency resource, and the first time-frequency resource includes at least one first time slot in a time domain.

Optionally, the first indication information may be carried in DCI.

Optionally, the first frequency domain resource is a part of frequency domain resources in the first time frequency resource, which may be understood as the first frequency domain resource is a part of frequency domain resources indicated by a frequency domain resource allocation field in DCI, or may be understood as the first frequency domain resource is a part of frequency domain resources allocated to a scheduled terminal device for receiving a data signal.

In a possible implementation manner, when the first indication information is carried in the DCI, the first indication information may be a new indication field in the DCI, where the indication field carries the first indication information.

It should be understood that, since the first indication information is used to indicate that no DMRS is carried in a part of frequency domains of the first time-frequency resource, DMRS is carried on other time-frequency resources except for the time-frequency resource corresponding to the first time-frequency resource in the first time-frequency resource, for example, the DMRS may be carried in (c) diagram in fig. 2.

Optionally, the first indication information may indicate one or more resource block groups in a bitmap manner, where the one or more resource block groups belong to the first frequency domain resource, and the resource block group includes one or more resource blocks.

Alternatively, the size of the one or more resource block groups may be determined by a higher layer parameter.

Alternatively, the size of the one or more resource block groups may be determined by a coefficient k, where k is an integer greater than 1, and the coefficient k is predefined or configured for the network device through higher layer signaling. The size of the resource block group is

Wherein the content of the first and second substances,

the size of the resource block group configured for the higher layer parameters.

Further, the size of the one or more resource block groups may be determined according to the length of the predefined first indication information. The size of the resource block group is

Wherein, the first and the second end of the pipe are connected with each other,

m is a length of the predefined first indication information, which is a size of a fractional Bandwidth (BWP).

Optionally, when the first frequency domain resource is a continuous frequency domain resource, the first indication information indicates continuous resource blocks RB in the frequency domain of the first time frequency resource by means of a Resource Indication Value (RIV). That is, when the frequency domain resource allocation type 1 is adopted, that is, when resource allocation is continuous, the first indication information may indicate a starting frequency domain position of the first frequency domain resource in the frequency domain resource of the first time frequency resource and the number of RBs included in the first frequency domain resource by means of an RIV. The calculation of RIV may be as in 3gpp ts 38.214. Alternatively, the first indication information may indicate consecutive resource block groups in the frequency domain of the first time-frequency domain resource by means of RIV. The resource block group includes one or more RBs. Illustratively, the resource block group includes k RBs, where k is predefined in a standard or configured for a network device through higher layer parameters.

S602, the network equipment sends a data signal to the terminal equipment.

S603, the terminal equipment receives the data signal.

Based on the scheme, the communication method provided by the application can realize flexible configuration of the DMRS by indicating that the time-frequency resources corresponding to part of the frequency-domain resources are not loaded with the DMRS through the indication information, so that the overhead of the DMRS is reduced.

It should be understood that, after the terminal device receives the data signal, the terminal device demodulates the received data, and therefore, the terminal device needs to store the DMRS carried by the second time-frequency resource, and may demodulate the received data signal by using the method shown in fig. 4, for simplicity, this embodiment only introduces the differences from the method shown in fig. 4:

(1) The difference from step S401 is that:

the step S401 may be used for the terminal device to acquire at least one DMRS carried on a second time-frequency resource, where the second time-frequency resource includes at least one second time slot in a time domain. It should be appreciated that since the DMRS received by the terminal device is used to demodulate the data signal on the first time-frequency resource, the frequency-domain resource of the second time-frequency resource is the same as the first frequency-domain resource.

It should be understood that, since only the DMRS corresponding to the second frequency-domain resource is obtained in the above steps, only the DMRS corresponding to the first frequency-domain resource can be used for demodulating the data signal. Thus, the terminal device acquiring the at least one DMRS further includes: the terminal device needs to acquire the DMRS associated with another part of the data signal, and since the DMRS is carried on other time-frequency resources in the first time-frequency resource except the time-frequency resource corresponding to the first frequency-frequency resource, the terminal device may acquire the DMRS through direct reception.

Fig. 7 is a flowchart illustrating a method 700 for communication according to an embodiment of the present application, where as shown in fig. 7, the method for communication includes:

s701, the network equipment sends first indication information to the terminal equipment.

Specifically, the network device sends first indication information to the terminal device, where the first indication information is used to indicate that the DMRS is not carried on the first time-frequency resource, and the first indication information is also used to indicate the second time slot. The first time-frequency resource comprises a first time slot in a time domain, a DMRS (demodulation reference signal) loaded on a second time-frequency resource corresponding to the second time slot is associated with the data signal loaded on the first time-frequency resource, the second time-frequency resource comprises the second time slot in the time domain, the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, and the second time slot and the first time slot are in an uplink and downlink time slot configuration cycle.

It should be understood that the first indication information is used to indicate that the DMRS is not carried in the first time-frequency resource, and may be (b) diagram in fig. 2, for example.

Optionally, the first indication information may be carried in DCI.

It should be noted that the first indication information indicates the second time slot, may be an index directly indicating the second time slot, or may indicate the second time slot by an indirect indication manner, for example, the first indication information indicates a time slot offset between the second time slot and the first time slot.

In a possible implementation manner, when the first indication information indicates the index of the second slot, a field of the first indication information may include two bits, and a value of the field may indicate different positions of the second slot, as shown in table 3 below.

TABLE 3

Field value	Means of
		01	DMRS-less, associated n-1 time slots
10	DMRS-less, associated n-2 time slots
		11	DMRS-less, associated n-3 time slots

In table 3, if the terminal device receives data in the nth slot, and when the bit value of the first indication information is 01, the first indication information indicates that the nth slot has no DMRS, and the data signal carried on the first time-frequency resource is associated with the DMRS corresponding to the nth-1 slot. When the bit value of the first indication information is 10, the first indication information indicates that the nth time slot has no DMRS, and the data signal carried on the first time-frequency resource is associated with the DMRS corresponding to the (n-2) th time slot. And when the bit value of the first indication information is 11, the first indication information indicates that the nth time slot has no DMRS, and the data signal carried on the first time-frequency resource is associated with the DMRS corresponding to the (n-3) th time slot. The first indication information indicating resource configuration may be as shown in fig. 8, the terminal device does not receive the DMRS on the time-frequency resource of the nth slot, and the first indication information may indicate the DMRS in the slot associated with the data signal on the slot n to the terminal device by using a bit value.

It should be understood that table 3 is only an example and not a limitation, and the bit values and corresponding meanings thereof may be recombined, which is not limited in the present application. Furthermore, the field of the first indication information may include a larger number of bits for indicating a larger number of second slot positions, i.e. other variations to table 3 should be within the scope of the present application.

In an implementable manner, the first indication information may also indicate that the DMRS is carried on the first time-frequency resource, at which time, the table 3 may be changed to a form as in table 4 below.

TABLE 4

Field value	Means of
		00	With DMRS
01	DMRS-less, associated n-1 time slots
		10	DMRS-less, associated n-2 time slots
11	DMRS-less, associated n-3 time slots

In table 4, when the bit value of the first indication information is 00, the first indication information indicates that the nth slot has the DMRS, and values of other fields may be the same as those described in table 3 above, which is not described herein again.

S702, the network equipment sends a data signal to the terminal equipment.

And S703, the terminal equipment receives the data signal.

Based on the scheme, the communication method provided by the application indicates that the time-frequency resource does not bear the DMRS through the indication information, and simultaneously indicates the time slot of the DMRS associated with the data signal borne on the time-frequency resource, so that the flexible configuration of the DMRS can be realized, and the expense of the DMRS is reduced.

It should be understood that, since the first indication information indicates the DMRS associated with the data on the first time-frequency resource, the terminal device may acquire the DMRS carried on the time-frequency resource of the second time slot indicated by the first indication information to demodulate the data.

It should be noted that, when the first time-frequency resource indicated by the first indication information received by the terminal device is in the first time slot, that is, the first time slot is the first time slot of a configuration period with an uplink time slot and a downlink time slot, the first indication information cannot indicate the second time slot for the terminal device, and at this time, the terminal device may discard the first indication information, and step 703 is not performed.

Optionally, when the first indication information fails to indicate the second timeslot for the terminal device, the terminal device executes step 703, and at this time, the terminal device performs channel estimation by using a blind channel estimation algorithm, and demodulates the data signal.

It should be noted that, because the second time slot is located before the first time slot, the terminal device needs to store the DMRS of the second time slot, and at this time, the terminal device may demodulate the data signal according to the method shown in fig. 4, which is not described herein again.

The method provided by the embodiment of the present application is described in detail above with reference to fig. 3 to 8. Hereinafter, a communication device according to an embodiment of the present application will be described in detail with reference to fig. 9 to 13.

Fig. 9 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown, the communication device 10 may include a processing module 11 and a transceiver module 12.

In one possible design, the communication device 10 may correspond to the network equipment in the above method embodiment.

In particular, the communication apparatus 10 may correspond to the network device in the method 300, the method 600 and the method 700 according to the embodiment of the present application, and the communication apparatus 10 may include a module for performing the method performed by the network device in the method 300 in fig. 3, the method 600 in fig. 6 or the method 700 in fig. 7. Also, the units and other operations and/or functions described above in the communication device 10 are intended to implement the corresponding flows of the method 300 in fig. 3 or the method 600 in fig. 6 or the method 700 in fig. 7, respectively.

When the communication device 10 is used to execute the method 300 in fig. 3, the transceiver module 12 may be used to execute steps 301 and 302 in the method 300.

When the communication device 10 is used to execute the method 600 in fig. 6, the transceiver module 12 may be used to execute steps 601 and 602 in the method 600.

When the communication device 10 is used to execute the method 700 in fig. 7, the transceiver module 12 may be used to execute steps 701 and 702 in the method 700.

Fig. 10 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown, the communication device 20 may include a transceiver module 21 and a processing module 22.

In a possible design, the communication device 20 may correspond to the terminal device in the above method embodiment, or a chip configured in the terminal device.

In particular, the communication apparatus 20 may correspond to the terminal device in the

methods

300, 400, 600 and 700 according to the embodiments of the present application, and the communication apparatus 20 may include a module for performing the method performed by the terminal device in the method 300 in fig. 3, 400 in fig. 4, 600 in fig. 6 or 700 in fig. 7. Also, the units and other operations and/or functions described above in the communication device 20 are respectively for implementing the corresponding flows of the method 300 in fig. 3 or the method 400 in fig. 4 or the method 600 in fig. 6 or the method 700 in fig. 7.

When the communication device 20 is used to execute the method 300 in fig. 3, the transceiver module 21 may be used to execute steps 301 and 302 in the method 300. The processing module 22 may be used to perform step 303 of the method 300.

When the communication device 20 is used to perform the method 400 in fig. 4, the processing module 22 may be used to perform steps 401 and 402 in the method 400.

When the communication device 20 is used to perform the method 600 in fig. 6, the transceiver module 21 may be used to perform the steps 601 and 602 in the method 600. The processing module 22 may be used to perform step 603 of the method 600.

When the communication device 20 is used to execute the method 700 in fig. 7, the transceiver module 21 may be used to execute steps 701 and 702 in the method 700. The processing module 22 may be configured to perform step 703 of the method 700.

Fig. 11 is a schematic diagram of a communication apparatus 30 provided in the embodiment of the present application according to the foregoing method, and as shown in fig. 11, the apparatus 30 may be a communication device including a network element having an access management function, such as an AMF.

The apparatus 30 may include a processor 31 (i.e., an example of a processing module) and a memory 32. The memory 32 is configured to store instructions, and the processor 31 is configured to execute the instructions stored in the memory 32, so as to enable the apparatus 30 to implement the steps performed by the network device in the method corresponding to fig. 3, or fig. 6 or fig. 7.

Further, the apparatus 30 may further include an input port 33 (i.e., one side of the transceiver module) and an output port 34 (i.e., another side of the transceiver module). Further, the processor 31, memory 32, input port 33, and output port 34 may communicate with each other via internal connection paths to communicate control and/or data signals. The memory 32 is used for storing a computer program, and the processor 31 may be used for calling and running the computer program from the memory 32 to control the input port 33 to receive signals and the output port 34 to send signals, so as to complete the steps of the network device in the above method. The memory 32 may be integrated in the processor 31 or may be provided separately from the processor 31.

Alternatively, the input port 33 may be a receiver and the output port 34 may be a transmitter. Wherein the receiver and the transmitter may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver.

Alternatively, if the communication device 30 is a chip or a circuit, the input port 33 is an input interface, and the output port 34 is an output interface.

As an implementation manner, the functions of the input port 33 and the output port 34 may be implemented by a transceiver circuit or a dedicated chip for transceiving. The processor 31 may be considered to be implemented by a dedicated processing chip, processing circuitry, a processor, or a general purpose chip.

As another implementation manner, a manner of using a general-purpose computer to implement the communication device provided in the embodiment of the present application may be considered. Program code that implements the functions of the processor 31, the input ports 33 and the output ports 34 is stored in the memory 32, and a general-purpose processor implements the functions of the processor 31, the input ports 33 and the output ports 34 by executing the code in the memory 32.

Each unit or unit in the communication apparatus 30 may be configured to execute each action or processing procedure executed by the network device in the foregoing method, and a detailed description thereof is omitted here to avoid redundancy.

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the apparatus 30, reference is made to the descriptions of the foregoing methods or other embodiments, which are not repeated herein.

Fig. 12 is a schematic diagram of a communication device 40 according to the foregoing method, where as shown in fig. 12, the device 40 may be a terminal device.

The apparatus 40 may include a processor 41 (i.e., an example of a processing module) and a memory 42. The memory 42 is configured to store instructions, and the processor 41 is configured to execute the instructions stored in the memory 42, so as to enable the apparatus 40 to implement the steps performed by the terminal device in fig. 3, fig. 4, fig. 6, or fig. 7.

Further, the apparatus 40 may further include an input port 43 (i.e., one side of the transceiver module) and an output port 44 (i.e., another side of the transceiver module). Further, the processor 41, the memory 42, the input port 43 and the output port 44 may communicate with each other via internal connection paths, passing control and/or data signals. The memory 42 is used for storing a computer program, and the processor 41 can be used for calling and running the computer program from the memory 42 to control the input port 43 to receive signals and the output port 44 to send signals, so as to complete the steps of the terminal device in the above method. The memory 42 may be integrated in the processor 41 or may be provided separately from the processor 41.

Alternatively, the input port 43 may be a receiver and the output port 44 may be a transmitter. Wherein the receiver and the transmitter may be the same or different physical entities. When the same physical entity, may be collectively referred to as a transceiver.

Alternatively, if the communication device 40 is a chip or a circuit, the input port 43 is an input interface, and the output port 44 is an output interface.

As an implementation manner, the functions of the input port 43 and the output port 44 may be realized by a transceiver circuit or a dedicated chip for transceiving. The processor 41 may be considered to be implemented by a dedicated processing chip, processing circuitry, a processor, or a general-purpose chip.

As another implementation manner, a manner of using a general-purpose computer to implement the communication device provided in the embodiment of the present application may be considered. Program codes that will realize the functions of the processor 41, the input port 43, and the output port 44 are stored in the memory 42, and the general-purpose processor realizes the functions of the processor 41, the input port 43, and the output port 44 by executing the codes in the memory 42.

Each module or unit in the communication apparatus 40 may be configured to execute each action or processing procedure executed by the terminal device in the foregoing method, and a detailed description thereof is omitted here to avoid redundancy.

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the apparatus 40, please refer to the descriptions of the foregoing methods or other embodiments, which are not repeated herein.

Fig. 13 is a schematic structural diagram of a terminal device 50 provided in the present application. For convenience of explanation, fig. 13 shows only main components of the terminal device. As shown in fig. 13, the terminal device 50 includes a processor, a memory, a control circuit, an antenna, and an input-output means.

The processor is mainly configured to process a communication protocol and communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above embodiment of the method for indicating a transmission precoding matrix. The memory is mainly used for storing software programs and data, for example, the codebook described in the above embodiments. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are primarily intended for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after baseband processing is carried out on the data to be sent, and the radio frequency circuit sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna after radio frequency processing is carried out on the baseband signal. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 13 shows only one memory and processor for the sake of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal device, execute a software program, and process data of the software program. The processor in fig. 13 integrates the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

As shown in fig. 13, the terminal device 50 includes a transceiving unit 51 and a processing unit 52. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Alternatively, a device for implementing a receiving function in the transceiver unit 51 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver unit 51 may be regarded as a transmitting unit, that is, the transceiver unit 51 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitting circuit, etc.

The terminal device shown in fig. 13 may perform each action performed by the terminal device in the

above methods

300, 400, 600, or 700, and a detailed description thereof is omitted here for avoiding redundancy.

It should be understood that in the embodiments of the present application, the processor may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a Read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (Static RAM), dynamic Random Access Memory (DRAM), synchronous DRAM (Synchronous DRAM, SDRAM), double data rate SDRAM (double data rate SDRAM, DDR SDRAM), enhanced SDRAM (Enhanced SDRAM, ESDRAM), synchronous Link DRAM (SLDRAM), and Direct memory bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer instructions or the computer program are loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to 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 implementation. 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 is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by 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, comprising:

the terminal device receives first indication information from the network device, the first indication information indicating that the number of code division multiplexing, CDM, groups of the DMRS which are not used for carrying data on the first time-frequency resource is 0,

alternatively, the first and second electrodes may be,

the first indication information is used for indicating that the number of time domain symbols corresponding to the DMRS on the first time-frequency resource is 0,

wherein the first time-frequency resource comprises at least one first time slot in the time domain;

and the terminal equipment receives a data signal on the first time-frequency resource, wherein the first time-frequency resource does not carry the DMRS.

2. The method of claim 1, further comprising:

the terminal equipment acquires at least one DMRS (demodulation reference signal), wherein the at least one DMRS is borne on a second time-frequency resource, the second time-frequency resource comprises at least one second time slot in a time domain, the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, and the at least one second time slot and the at least one first time slot are in an uplink and downlink time slot configuration period;

and the terminal equipment demodulates the data signal according to the at least one DMRS.

3. The method of claim 2,

the second time slot is any time slot before the first time slot in the uplink and downlink time slot configuration period.

4. The method of claim 2, further comprising:

and the terminal equipment receives downlink control information, wherein the downlink control information is used for scheduling the terminal equipment to receive the at least one DMRS in the second time slot.

5. The method of claim 3 or 4,

the first indication information is further used for indicating at least one DMRS port, where the at least one DMRS port is associated with a data signal carried on the first time-frequency resource, and the obtaining, by the terminal device, at least one DMRS includes:

and the terminal equipment acquires at least one DMRS of the at least one DMRS port.

6. A method of communication, comprising:

the terminal equipment receives first indication information from the network equipment, wherein the first indication information is used for indicating that no DMRS is loaded on a time-frequency resource corresponding to a first frequency resource in first time-frequency resources, and the first frequency resource is a part of frequency resources in the first time-frequency resources,

and the terminal equipment receives a data signal on the first time-frequency resource.

7. The method of claim 6, further comprising:

the terminal equipment acquires at least one DMRS, wherein the at least one DMRS is borne on a second time-frequency resource, the second time-frequency resource comprises at least one second time slot in the time domain, the frequency domain resource of the second time-frequency resource is the same as the first frequency domain resource, and the at least one second time slot and the at least one first time slot are in an uplink and downlink time slot configuration cycle;

and the terminal equipment demodulates the data signal corresponding to the first frequency domain resource in the data signal according to the at least one DMRS.

8. The method of claim 7,

9. The method of claim 7, further comprising:

10. The method according to claim 8 or 9, characterized in that the method further comprises:

the terminal device receives second indication information, where the second indication information is used to indicate at least one DMRS port, and the at least one DMRS port is associated with a data signal carried on the first time-frequency resource, where the terminal device acquires the at least one DMRS, and the method includes:

11. A method of communication, comprising:

the terminal equipment receives first indication information from the network equipment, wherein the first indication information is used for indicating that the DMRS is not carried on the first time-frequency resource and is also used for indicating a second time slot,

the first time-frequency resource comprises a first time slot in the time domain, a DMRS (demodulation reference signal) carried on a second time-frequency resource corresponding to the second time slot is associated with the data signal carried on the first time-frequency resource, the second time-frequency resource comprises the second time slot in the time domain, the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, and the second time slot and the first time slot are in an uplink and downlink time slot configuration period;

12. The method of claim 11, further comprising:

the terminal equipment acquires the DMRS loaded on the second time-frequency resource;

and the terminal equipment demodulates the data information according to the DMRS loaded on the second time frequency resource.

13. The method according to claim 11 or 12,

the second time slot is a time slot before the first time slot in the uplink and downlink time slot configuration period.

14. A method of communication, comprising:

the network device transmits first indication information to the terminal device, the first indication information indicating that the number of code division multiplexing, CDM, groups of the DMRS which are not used for carrying data on the first time-frequency resource is 0,

alternatively, the first and second liquid crystal display panels may be,

and the network equipment transmits a data signal on the first time-frequency resource.

15. A method of communication, comprising:

the network equipment sends first indication information to the terminal equipment, wherein the first indication information is used for indicating that the time-frequency resource corresponding to a first frequency-domain resource in a first time-frequency resource does not bear the DMRS, the first frequency-domain resource is a part of the frequency-domain resource in the first time-frequency resource,

the network device transmits a data signal on the first time-frequency resource.

16. A method of communication, comprising:

the network equipment sends first indication information to the terminal equipment, wherein the first indication information is used for indicating that the DMRS is not carried on the first time-frequency resource and is also used for indicating a second time slot,

17. The method of claim 16, further comprising:

and the network equipment sends the DMRS loaded on the second time frequency resource to the terminal equipment.

18. The method of claim 16 or 17,

19. A communications device comprising means for performing a method as claimed in any one of claims 1 to 18.

20. A communication apparatus, characterized in that,

comprises a processor and a memory; the memory is for storing one or more computer programs that, when executed, cause the method of any of claims 1-5 to be performed, or cause the method of any of claims 6-10 to be performed, or cause the method of any of claims 11-13 to be performed.

21. A communication apparatus, characterized in that,

comprises a processor and a memory; the memory is for storing one or more computer programs that, when executed, cause the method of claim 14 to be performed, or cause the method of claim 15 to be performed, or cause the method of any of claims 16-18 to be performed.

22. A computer-readable storage medium, characterized in that,

the computer readable storage medium is for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 5, or causes the computer to perform the method of any one of claims 6 to 10, or causes the computer to perform the method of any one of claims 11 to 13.

23. A computer-readable storage medium, characterized in that,

the computer-readable storage medium is used for storing a computer program which, when run on a computer, causes the computer to perform the method of claim 14, or causes the computer to perform the method of claim 15, or causes the computer to perform the method of any one of claims 16 to 18.

24. A computer program product comprising, in combination,

the computer program product comprises: computer program code for implementing a method according to any one of claims 1 to 5, or for implementing a method according to any one of claims 6 to 10, or for implementing a method according to any one of claims 11 to 13, when said computer program code is run.

25. A computer program product comprising, in a computer readable medium,

the computer program product comprises: computer program code for implementing the method of claim 14, or for implementing the method of claim 15, or for implementing the method of any of claims 16 to 18, when said computer program code is run.