WO2022147802A1

WO2022147802A1 - Downlink signal transmission method and apparatus

Info

Publication number: WO2022147802A1
Application number: PCT/CN2021/070978
Authority: WO
Inventors: 颜矛
Original assignee: 华为技术有限公司
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2022-07-14
Also published as: CN116762304A

Abstract

Disclosed are a downlink signal transmission method and apparatus, which are used for solving the problem of the transmission of a demodulation reference signal consuming transmission resources. The method comprises: a network device sending, to a terminal device, a downlink control channel and a first demodulation reference signal, wherein the first demodulation reference signal is associated with the downlink control channel, the downlink control channel is used for scheduling a downlink data channel, and the first demodulation reference signal is used for demodulating the downlink control channel and the downlink data channel; and the network device sending the downlink data channel to the terminal device.

Description

Downlink signal transmission method and device

technical field

The present application relates to the field of communication technologies, and in particular, to a method and apparatus for transmitting downlink signals.

Background technique

In a wireless communication system, wireless signal transmission is affected by channel fading, and the receiver needs channel information to recover the channel. In general, the receiver can obtain channel information by demodulation reference signal (DMRS), and then demodulate the wireless signal carried by the channel.

At present, downlink signals are usually set to be associated with DMRSs, such as downlink data channels and downlink control channels having their associated DMRSs. In downlink transmission, different downlink signals need to be sent together with their associated DMRS, and then the receiver can demodulate the downlink signal sent together with the DMRS based on the DMRS. DMRS occupies resource elements, consumes transmission resources, and has large signaling overhead.

SUMMARY OF THE INVENTION

The present application provides a method and device for transmitting downlink signals, so as to realize multiplexing of demodulation reference signals, so as to reduce the consumption of transmission resources and signaling overhead.

In a first aspect, the present application provides a method for transmitting downlink signals, comprising: a network device sending a downlink control channel and a first demodulation reference signal to a terminal device, the first demodulation reference signal being associated with the downlink control channel, The downlink control channel is used to schedule a downlink data channel, and the first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel; the network device sends the downlink data to the terminal device channel. By setting the demodulation reference signal associated with the downlink control channel, it can be used to demodulate the downlink data channel, realize the multiplexing of the demodulation reference signal, and reduce the consumption of transmission resources and signaling overhead.

In an optional implementation manner, one or more of the following conditions are satisfied: the downlink control channel and the downlink data channel use the same transmission mode; the first link associated with the downlink control channel and the downlink data channel The second demodulation reference signal adopts the same transmission mode; the first demodulation reference signal and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the first demodulation reference signal and the downlink data channel The modulation reference signal adopts the same transmission method. By setting the transmission mode of the downlink data channel, the downlink control channel that schedules it, and the demodulation reference signal associated with the downlink control channel to be the same, the demodulation reference signal associated with the downlink control channel can be used to demodulate the downlink data channel, and the demodulation reference signal can be realized. multiplexing of signals.

In an optional implementation manner, the method further includes: the network device sending first indication information to the terminal device, where the first indication information is used to indicate one or more of the following: the The downlink control channel and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode; the first demodulation reference signal and the The downlink data channel adopts the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel adopt the same transmission mode.

In this application, the network device informs the terminal device through the first indication information that the downlink data channel is in the same transmission mode as the downlink control channel that schedules it and the demodulation reference signal associated with the downlink control channel, so as to realize the multiplexing of the demodulation reference signal, and the terminal device The downlink data channel can be demodulated according to the demodulation reference signal associated with the downlink control channel. There is no need for the network device to issue the demodulation reference signal associated with the downlink control channel, which can reduce the consumption of transmission resources and reduce signaling overhead.

In an optional implementation manner, the same transmission manner includes the same transmission resource, the same precoding, and the same precoding granularity.

In an optional implementation manner, the method further includes: sending, by the network device, a second demodulation reference signal associated with the downlink data channel to the terminal device. In this way, the terminal device can combine the first demodulation reference signal and the second demodulation reference signal to demodulate the downlink data channel, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the method further includes: sending, by the network device, second indication information to the terminal device, where the second indication information is used to indicate the amount of time occupied by the second demodulation reference signal. Time domain resource location and/or frequency domain resource location. In this way, the time-frequency resource location where the second demodulation reference signal is located is directly and explicitly indicated to the terminal device.

In an optional implementation manner, the method further includes: the network device sending second indication information to the terminal device, where the second indication information includes information used to indicate the first time domain offset ; wherein, the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel (for example: the time domain resource of the downlink control channel starts from the distance between the start position of the downlink control channel or the end position of the time domain resource of the downlink control channel), or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the first solution the distance between the time domain resource positions of the demodulation reference signal, or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal from the time domain resource of the downlink data channel. The distance between the start position (or, the end position of the time domain resource). In this way, the time domain resource location where the second demodulation reference signal is located can be indirectly or implicitly indicated to the terminal device, and the terminal device is based on the combination of the time domain resource location where the first demodulation reference signal/downlink control channel is located. The position of the second demodulation reference signal can be known by the first time-domain offset.

In an optional implementation manner, the method further includes: the network device sending third indication information to the terminal device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, One or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference A signal is associated with the downstream data channel. In this way, the terminal device can demodulate some or all of the downlink data channels sent by the network device according to the third indication information and the first demodulation reference signal, so as to realize the multiplexing of the demodulation reference signals, which can reduce the number of downlink data channels. The transmission resource occupied by the associated second demodulation reference signal reduces signaling overhead.

In an optional implementation manner, the precoding granularity of the downlink control channel is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the downlink control channel is related to the second demodulation reference The precoding granularity of the signal is related; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the first demodulation reference signal. The precoding granularity of the second demodulation reference signal is related.

In a second aspect, the present application provides a method for transmitting a downlink signal, including: a terminal device receives a downlink control channel and a first demodulation reference signal from a network device, where the first demodulation reference signal is associated with the downlink control channel , the downlink control channel is used to schedule the downlink data channel, and the first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel; demodulating the downlink control channel; the terminal device receives the downlink data channel from the network device, and demodulates the downlink data channel according to the first demodulation reference signal. By setting the demodulation reference signal associated with the downlink control channel, it can be used to demodulate the downlink data channel, realize the multiplexing of the demodulation reference signal, and reduce the consumption of transmission resources and signaling overhead.

In an optional implementation manner, when the terminal device receives the downlink control channel from the network device, and receives (obtains) the downlink data channel from the network device based on the downlink control channel, firstly according to the The first demodulation reference signal demodulates the downlink control channel and the downlink data channel respectively; or, the terminal device may first receive the downlink control channel from the network device, that is, first demodulate the downlink control channel according to the first demodulation reference signal channel, and then based on the control information in the downlink control channel, receive (acquire) the downlink data channel from the network device, and demodulate the downlink data channel according to the first demodulation reference signal.

In an optional implementation manner, the method further includes: receiving, by the terminal device, first indication information from the network device, where the first indication information is used to indicate one or more of the following: The downlink control channel and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode; the first demodulation reference signal and the downlink data channel adopts the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel adopt the same transmission mode.

In this application, the network device informs the terminal device through the first indication information that the downlink data channel is in the same transmission mode as the downlink control channel that schedules it and the demodulation reference signal associated with the downlink control channel, so as to realize the multiplexing of the demodulation reference signal, and the terminal device The downlink data channel can be demodulated according to the demodulation reference signal associated with the downlink control channel. There is no need for the network device to issue the demodulation reference signal associated with the downlink control channel, which can reduce the consumption of transmission resources and reduce the signaling overhead.

In an optional implementation manner, the method further includes: receiving, by the terminal device, a second demodulation reference signal associated with the downlink data channel from the network device; demodulate the reference signal and the second demodulation reference signal, and demodulate the downlink data channel. In this way, the terminal device can combine the first demodulation reference signal and the second demodulation reference signal to demodulate the downlink data channel, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the method further includes: receiving second indication information from the network device, where the second indication information is used to indicate time domain resources occupied by the second demodulation reference signal location and/or frequency domain resource location. In this way, the time-frequency resource location where the second demodulation reference signal is located is directly and explicitly indicated to the terminal device.

In an optional implementation manner, the method further includes: receiving second indication information from the network device, where the second indication information includes information used to indicate the first time domain offset; wherein, The first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel (for example: the time domain resource start position of the downlink control channel or the distance between the time domain resource end position of the downlink control channel), or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the first demodulation reference signal The distance between the time-domain resource positions of the , or the first time-domain offset is used to characterize the time-domain resource position of the second demodulation reference signal and the time-domain resource start position of the downlink data channel ( Alternatively, the distance between the end positions of the time domain resources). In this way, the time domain resource location where the second demodulation reference signal is located can be indirectly or implicitly indicated to the terminal device, and the terminal device is based on the combination of the time domain resource location where the first demodulation reference signal/downlink control channel is located. The position of the second demodulation reference signal can be known by the first time-domain offset.

In an optional implementation manner, the method further includes: receiving, by the terminal device, third indication information from the network device, where the third indication information is used to indicate the precoding granularity of the downlink control channel , one or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation A reference signal is associated with the downlink data channel. In this way, the terminal device can demodulate some or all of the downlink data channels sent by the network device according to the third indication information and the first demodulation reference signal, so as to realize the multiplexing of the demodulation reference signals, which can reduce the number of downlink data channels. The transmission resource occupied by the associated second demodulation reference signal reduces signaling overhead.

In an optional implementation manner, the terminal device demodulating the downlink data channel according to the first demodulation reference signal includes: the terminal device demodulating the downlink data channel according to the first demodulation reference signal and the first demodulation reference signal. The third indication information is to demodulate part or all of the downlink data channel sent by the network device.

In an optional implementation manner, the terminal device demodulates part or all of the downlink data channel sent by the network device according to the first demodulation reference signal and the third indication information, Including: the terminal device determines the transmission mode of the downlink data channel and the transmission of the first demodulation reference signal according to the third indication information and the downlink control channel demodulated by the first demodulation reference signal wherein, the downlink data channel and the second demodulation reference signal use the same transmission mode, the first demodulation reference signal and the downlink control channel use the same transmission mode, and the transmission mode includes pre- Coding, precoding granularity, transmission resources.

If the transmission mode of the downlink data channel is the same as the transmission mode of the first demodulation reference signal, the terminal device demodulates all the downlink data channels according to the first demodulation reference signal; if The transmission mode of the downlink data channel is partially the same as the transmission mode of the first demodulation reference signal, and the terminal device demodulates part of the downlink data channel according to the first demodulation reference signal.

In an optional implementation manner, the terminal device demodulates part or all of the downlink data channel sent by the network device according to the first demodulation reference signal and the third indication information, It includes: the terminal device determines, according to the third indication information, that the precoding granularity of the downlink data channel is the same as the precoding granularity of the first demodulation reference signal; The reference signal demodulates all the downlink data channels sent by the network device; or, the terminal device demodulates according to the first demodulation reference signal, which is sent by the network device and is the same as the first demodulation reference signal. The signal occupies the downlink data channel of the same frequency domain resource.

In an optional implementation manner, the terminal device demodulates part or all of the downlink data channel sent by the network device according to the first demodulation reference signal and the third indication information, Including: the terminal device determines, according to the third indication information, that the precoding granularity of the downlink data channel is different from that of the first demodulation reference signal, and the precoding resource block group of the downlink data channel is different from the precoding resource block group of the downlink data channel. The precoding resource block group of the first demodulation reference signal is partially overlapped; the terminal device demodulates the precoding resource block group of the overlapping portion according to the first demodulation reference signal in the precoding resource block group of the overlapping portion. Downlink data channel.

In a third aspect, the present application provides an apparatus for transmitting downlink signals, which is applied to network equipment. The apparatus includes: a processing module configured to generate a downlink control channel, a first demodulation reference signal, and a downlink data channel, the first A demodulation reference signal is associated with the downlink control channel, the downlink control channel is used to schedule the downlink data channel, and the first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel; The communication module is configured to send the downlink control channel and the first demodulation reference signal to the terminal device; the communication module is further configured to send the downlink data channel to the terminal device. By setting the demodulation reference signal associated with the downlink control channel, it can be used to demodulate the downlink data channel, realize the multiplexing of the demodulation reference signal, and reduce the consumption of transmission resources and signaling overhead.

In an optional implementation manner, the communication module is further configured to send first indication information to the terminal device, where the first indication information is used to indicate one or more of the following: the downlink control The channel and the downlink data channel use the same transmission mode; the downlink control channel and the second demodulation reference signal associated with the downlink data channel use the same transmission mode; the first demodulation reference signal and the downlink data channel use the same transmission mode; The data channel adopts the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel adopt the same transmission mode.

In an optional implementation manner, the communication module is further configured to send the second demodulation reference signal associated with the downlink data channel to the terminal device. In this way, the terminal device can combine the first demodulation reference signal and the second demodulation reference signal to demodulate the downlink data channel, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the communication module is further configured to send second indication information to the terminal device, where the second indication information is used to indicate the time domain occupied by the second demodulation reference signal Resource location and/or frequency domain resource location.

In an optional implementation manner, the communication module is further configured to send second indication information to the terminal device, where the second indication information includes information used to indicate the first time domain offset; wherein , the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel (for example: the time domain resource start position of the downlink control channel) or the distance between the time domain resource end position of the downlink control channel), or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the first demodulation reference The distance between the time domain resource positions of the signal, or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource start position of the downlink data channel (or, the distance between where the temporal resource ends). In this way, the time domain resource location where the second demodulation reference signal is located can be indirectly or implicitly indicated to the terminal device, and the terminal device is based on the combination of the time domain resource location where the first demodulation reference signal/downlink control channel is located. The position of the second demodulation reference signal can be known by the first time-domain offset.

In an optional implementation manner, the communication module is further configured to send third indication information to the terminal device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, the One or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference signal and the The downlink data channel is associated. In this way, the terminal device can demodulate some or all of the downlink data channels sent by the network device according to the third indication information and the first demodulation reference signal, so as to realize the multiplexing of the demodulation reference signals, which can reduce the number of downlink data channels. The transmission resource occupied by the associated second demodulation reference signal reduces signaling overhead.

In a fourth aspect, the present application provides an apparatus for transmitting downlink signals, which is applied to terminal equipment. The apparatus includes: a communication module configured to receive a downlink control channel and a first demodulation reference signal from a network device, the first A demodulation reference signal is associated with the downlink control channel, the downlink control channel is used to schedule a downlink data channel, and the first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel; processing module , used for demodulating the downlink control channel according to the first demodulation reference signal; the communication module is also used for receiving the downlink data channel from the network device; the processing module is also used for receiving the downlink data channel according to the first demodulation reference signal; The first demodulation reference signal demodulates the downlink data channel. By setting the demodulation reference signal associated with the downlink control channel, it can be used to demodulate the downlink data channel, realize the multiplexing of the demodulation reference signal, and reduce the consumption of transmission resources and signaling overhead.

In an optional implementation manner, the communication module is specifically configured to receive a downlink control channel from a network device, and receive (acquire) the downlink data channel from the network device based on the downlink control channel; The processing module is specifically configured to demodulate the downlink control channel and the downlink data channel respectively according to the first demodulation reference signal; or, the communication module may first receive the downlink control channel from the network device, and the processing module is The downlink control channel is first demodulated according to the first demodulation reference signal; the communication module then receives (acquires) the downlink data channel from the network device based on the control information in the downlink control channel, and the processing module then receives (acquires) the downlink data channel according to the The first demodulation reference signal demodulates the downlink data channel.

In an optional implementation manner, the communication module is further configured to receive first indication information from the network device, where the first indication information is used to indicate one or more of the following: the The downlink control channel and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode; the first demodulation reference signal and the The downlink data channel adopts the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel adopt the same transmission mode.

In an optional implementation manner, the communication module is further configured to receive a second demodulation reference signal associated with the downlink data channel from the network device; the processing module is further configured to The first demodulation reference signal and the second demodulation reference signal demodulate the downlink data channel. In this way, the terminal device can combine the first demodulation reference signal and the second demodulation reference signal to demodulate the downlink data channel, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the communication module is further configured to send second indication information to the terminal device, where the second indication information is further used to indicate the time occupied by the second demodulation reference signal domain resource location and/or frequency domain resource location.

In an optional implementation manner, the communication module is further configured to receive third indication information from the network device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, the one or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference signal associated with the downlink data channel. In this way, the terminal device can demodulate some or all of the downlink data channels sent by the network device according to the third indication information and the first demodulation reference signal, so as to realize the multiplexing of the demodulation reference signals, which can reduce the number of downlink data channels. The transmission resource occupied by the associated second demodulation reference signal reduces signaling overhead.

In an optional implementation manner, the processing module is further configured to demodulate the downlink data channel sent by the network device according to the first demodulation reference signal and the third indication information. some or all.

In an optional implementation manner, the processing module is specifically configured to: determine the downlink data channel according to the third indication information and the downlink control channel demodulated by the first demodulation reference signal. The transmission mode and the transmission mode of the first demodulation reference signal; wherein, the downlink data channel and the second demodulation reference signal adopt the same transmission mode, and the first demodulation reference signal and the downlink control signal use the same transmission mode. The channel adopts the same transmission mode, and the transmission mode includes precoding, precoding granularity, and transmission resources. If the transmission mode of the downlink data channel is the same as the transmission mode of the first demodulation reference signal, demodulate all the downlink data channels according to the first demodulation reference signal; if the downlink data channel The transmission mode of the channel is partially the same as the transmission mode of the first demodulation reference signal, and then part of the downlink data channel is demodulated according to the first demodulation reference signal.

In an optional implementation manner, the processing module is specifically configured to: determine the precoding granularity of the downlink data channel and the precoding granularity of the first demodulation reference signal according to the third indication information same. All of the downlink data channels sent by the network device are demodulated according to the first demodulation reference signal; or, the terminal device demodulates according to the first demodulation reference signal, which is sent by the network device and is related to The first demodulation reference signal occupies a downlink data channel of the same frequency domain resource.

In an optional implementation manner, the processing module is specifically configured to: determine, according to the third indication information, that the precoding granularity of the downlink data channel and the first demodulation reference signal are different, and the precoding granularity of the downlink data channel is different from that of the first demodulation reference signal. The precoding resource block group of the downlink data channel partially overlaps the precoding resource block group of the first demodulation reference signal. The downlink data channel in the precoding resource block group of the overlapping part is demodulated according to the first demodulation reference signal in the precoding resource block group of the overlapping part.

In a fifth aspect, the present application provides a communication device, comprising a processor, the processor is coupled with a memory, the memory is used for storing a computer program or an instruction, and the processor is used for executing the computer program or instruction to execute Each implementation method of the above first aspect or the second aspect. The memory may be located within the device or external to the device. The number of the processors is one or more.

In a sixth aspect, the present application provides a communication device, including: a processor and an interface circuit, where the interface circuit is configured to communicate with other devices, and the processor is used for each implementation method of the first aspect or the second aspect.

In a seventh aspect, the present application provides a communication system, including: a network device for executing the implementation methods of the first aspect, and a terminal device for executing the implementation methods of the second aspect.

In an eighth aspect, the present application further provides a chip system, including: a processor configured to execute each implementation method of the first aspect or the second aspect.

In a ninth aspect, the present application further provides a computer program product, the computer product includes a computer program, and when the computer program runs, each implementation method of the above-mentioned first aspect or the second aspect is executed.

In a tenth aspect, the present application further provides a computer-readable storage medium, where computer programs or instructions are stored in the computer-readable storage medium, and when the instructions are run on a computer, the above-mentioned first aspect or second aspect is implemented of each implementation method.

For the technical effects that can be achieved by the fifth aspect to the tenth aspect, please refer to the technical effects brought by the corresponding technical solutions in the first aspect to the second aspect, which will not be repeated here.

Description of drawings

1 is a schematic structural diagram of a transmission resource;

FIG. 2 is one of schematic diagrams of the distribution of demodulation reference signals provided by an embodiment of the present application;

3 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

4 is a schematic diagram of an interaction flow of information transmission between a network device and a terminal device;

FIG. 5 is one of the schematic flowcharts of the downlink signal transmission method provided by the embodiment of the present application;

FIG. 6 is a second schematic flowchart of a downlink signal transmission method provided by an embodiment of the present application;

FIG. 7 is a third schematic flowchart of a downlink signal transmission method provided by an embodiment of the present application;

FIG. 8a is the second schematic diagram of the distribution of the demodulation reference signal provided by the embodiment of the present application;

FIG. 8b is the third schematic diagram of the distribution of the demodulation reference signal provided by the embodiment of the present application;

FIG. 9a is one of the schematic diagrams of precoding of a demodulation reference signal provided by an embodiment of the present application;

FIG. 9b is a second schematic diagram of precoding of a demodulation reference signal provided by an embodiment of the present application;

FIG. 9c is a third schematic diagram of precoding of a demodulation reference signal provided by an embodiment of the present application;

FIG. 9d is a fourth schematic diagram of precoding of a demodulation reference signal provided by an embodiment of the present application;

FIG. 10 is a fourth schematic flowchart of a downlink signal transmission method provided by an embodiment of the present application;

FIG. 11 is a fifth schematic flowchart of a downlink signal transmission method provided by an embodiment of the present application;

FIG. 12 is a structural block diagram of a downlink signal transmission apparatus provided by an embodiment of the present application;

FIG. 13 is one of schematic structural diagrams of a communication device provided by an embodiment of the present application;

FIG. 14 is a second schematic structural diagram of a communication apparatus provided by an embodiment of the present application.

Detailed ways

The embodiments of the present application may be applied to wireless communication networks, such as 4G networks (eg, LTE), 5G networks, or future networks, etc. The present application will be further described in detail below with reference to the accompanying drawings.

First of all, some terms provided in this application are explained to facilitate the understanding of those skilled in the art:

(1) Network equipment and terminal equipment

The network equipment can communicate with the terminal equipment to provide wireless access services for the terminal equipment. The network device may also be referred to as a base station device, and may also be referred to as a base station, a relay station, an access node (AN), or the like. Exemplarily, the network device may be a base transceiver station (BTS) in a global system for mobile communication (GSM) or a code division multiple access (CDMA) network, or It can be an NB (NodeB) in a wideband code division multiple access (WCDMA) network, or an eNB or an eNodeB (Evolutional NodeB) in a long term evolution (long term evolution, LTE) system. The network device may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario. The network device may also be a base station device in a 5G network or a network device in a future evolved PLMN network. The network device can also be a wearable device or a vehicle-mounted device.

Terminal equipment may also be referred to as user equipment (UE), access terminal, terminal unit, end station, mobile station, mobile station, remote station, remote terminal, mobile device, mobile terminal, terminal, wireless communication device, terminal agent or terminal device, etc. Exemplarily, the terminal device may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), Handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, automotive vehicles, in-vehicle devices or in-vehicle modules, wearable devices, terminal devices in 5G networks or in future evolved PLMN networks Wait.

(2) Downlink control channel, downlink data channel

In the downlink transmission process, the signal sent by the network device to the terminal device is also called the downlink signal, and the downlink signal includes the downlink control signal and the downlink data signal. The downlink control channel in the embodiment of the present application is used to refer to the downlink control signal, that is, the downlink control channel can also be understood as a downlink control signal, and the downlink control channel can be a physical downlink control channel (physical downlink control channel, PDCCH). The downlink control channel in the embodiment of the present application is used to refer to the downlink data signal, that is, the downlink data channel can also be understood as a downlink data signal, and the downlink data channel can be a physical downlink shared channel (physical downlink shared channel, PDSCH). For higher layers, these channels correspond to resource elements (resource elements, REs) that carry bit information of upper layers (eg, layer 2); for air interfaces, these channels carry wireless signals.

The downlink control channel is used to schedule the downlink data channel. For example, the PDCCH is used to transmit PDSCH-related scheduling and configuration information. The PDCCH carries downlink control information (DCI), and the DCI is used to indicate the configuration information of the PDSCH (for example, time /frequency position, modulation information, etc.).

(3) Random access

The downlink transmission involved in the embodiments of the present application includes a process in which a network device sends a message to a terminal device in a random access (random access, RA) process, and a downlink transmission between the network device and the terminal device after the terminal device accesses.

Wherein, random access is an information exchange mechanism (or process) for establishing a connection between a device not accessing the network and the network in an LTE or 5G communication system with access control. Since the random access process is carried by the random access channel (RACH), RA and RACH are often mixed to indicate random access in protocols and spoken language. Random access is divided into contention-based random access and non-contention random access. Contention-based random access is usually divided into 4 steps, each step corresponds to a message: including message 1, message 2, message 3, and message 4, which respectively carry different signaling or information. Non-contention based random access has only the first 2 steps. In addition, in order to reduce the access time of the 4-step contention-based random access, there are further 2-step random access. In 2-step random access, it consists of message A and message B, where message A includes the preamble and the first data information (for example, similar to message 1 and message 3 in 4-step random access), and message B includes Including contention resolution and uplink scheduling (eg, similar to message 2 and message 4 in 4-step random access).

Random access opportunity: Random access opportunity, also known as random access resource (RACH resource), random access opportunity (RACH occasion/RACH transmission occasion/RACH opportunity/RACH chance, RO), is used to carry one or more time and frequency resources for a random access preamble. Logically, a random access opportunity is used to carry the information/signal of the physical random access channel (PRACH). Sometimes it is also called equivalently as physical random access opportunity (PRACH occasion, RO), physical random access resource (PRACH resource).

Message 1 (message 1, Msg1): that is, a random access preamble (preamble or sequence), which is carried through a physical random access channel (PRACH). It is usually used for terminal devices to initiate connection requests, handover requests, synchronization requests, and scheduling requests to network devices.

Message 2 (message 2, Msg2): Also known as a random access response (random access response, RAR) message. It is the response of the network device side to the received message 1, and one message 2 can respond to multiple Msg1s. For a single random access preamble, there is a specific random access response message at the MAC. The network device often encapsulates all the random access preamble responses detected on a random access opportunity together to form a Msg2. That is, after the terminal device sends the random access preamble, it searches the corresponding message 2 for the random access response message corresponding to the random access preamble sent by itself, and ignores the response messages for other random access preambles. If the network side receives message 1, it will encapsulate at least one of the following information into a random access response (RAR) and send: the index of message 1 (random access preamble identity, RAPID), uplink scheduling grant (uplink grant) , time advance (timing advance), temporary cell radio network temporary identity (TC-RNTI), etc. The network side can respond to multiple Msg1s simultaneously in the same Msg2, that is, including multiple RARs.

Message 3 (message 3, Msg3): Also known as the first uplink scheduled transmission, it is the scheduled transmission by the UL grant in message 2, or the retransmission scheduled by the DCI scrambled by the TC-RNTI. The transmission content of Msg3 is a high-level message, such as a connection establishment request message (specifically, the identification information of the user who initiates the connection request). The function of this message is for contention resolution. If multiple different devices use the same Msg1 for random access, Msg3 and Msg4 can jointly determine whether there is a conflict. The definition of Msg3 on the protocol: Message transmitted on UL-SCH (uplink shared channel) containing a C-RNTI MAC (Medium access control) CE (control element) or CCCH (Common Control Channel) SDU (Service Data Unit), submitted from upper layer and associated with the UE Contention Resolution Identity, as part of a Random Access procedure. The transmission of message 3 includes retransmission and power control (that is, in the UL grant that schedules initial transmission or retransmission, there is power control information).

Message 4 (message 4, Msg4): used for contention resolution. It usually includes the CCCH SDU carried in message 3. If the device detects the CCCH SDU sent by itself in message 4, it considers that the contention for random access is successful, and continues the next communication process. Message 4 is retransmitted, that is, the corresponding physical uplink control channel (PUCCH) transmits feedback information (whether message 4 is successfully detected), and the device transmits feedback information on PUCCH with power control.

Transmit power, also known as output power. It can be defined as the output power measured on all or part of the supported frequencies or frequency bands or bandwidths within a given time and/or period. For example, the measured time is at least 1 ms, and for example, the measured time is at least one time slot corresponding to a certain subcarrier interval. In one embodiment, power obtained for a time period of at least 1 ms of measurement is used.

(4) Modulation and demodulation

Modulation is the process of processing the information of the signal source and adding it to the carrier to make it into a form suitable for channel transmission. Different modes correspond to different modulation methods, such as multi-carrier modulation or single-carrier modulation, quadrature amplitude modulation (quadrature Amplitude modulation, QAM), pulse amplitude modulation (pulse amplitude modulation, PAM), phase shift keying (phase shift keying) keying, PSK) modulation, amplitude keying (amplitude shift keying, ASK) modulation and so on. Demodulation is the reverse process of modulation, recovering the original data bits or symbols from the signal. Demodulation can also sometimes be referred to as detection.

(5) Reference signal, demodulation reference signal

Reference signal (RS) is used to obtain known signals affected by external factors (such as spatial channels, non-idealities of transmitting or receiving devices) during transmission, and perform channel estimation, auxiliary signal demodulation, detection, etc. The transmitting end (or the receiving end) knows or can infer the time and frequency position where the reference signal is located, and other wireless signals/symbols carried on the time and frequency according to a predetermined rule. According to function division, reference signals include demodulation reference signal (DMRS), channel state information reference signal (CSI-RS), phase tracking reference signal (PTRS), channel state information reference signal (CSI-RS), Sounding reference signal (sounding reference signal, SRS) and so on. Among them, DMRS and CSI-RS are used to obtain channel information, and PTRS is used to obtain phase change information.

The embodiments of the present application focus on the application of the demodulation reference signal DMRS in the downlink transmission process. The downlink signal sent by the network device is affected by channel fading, and the terminal device needs to obtain channel information through the DMRS to restore the channel, and then demodulate the downlink signal according to the channel information obtained by the DMRS.

Usually, the terminal device knows or can infer the DMRS sent by the network device according to predetermined rules. As an implementation method, the terminal device can perform the channel channel through the linear channel model according to the DMRS received from the network device and the DMRS sent by the aforementioned network device. estimate. The linear channel model is as follows: y=Hx+n; where y is the signal received by the receiver, which can be the DMRS received by the aforementioned terminal device; H represents the channel, or can also be understood as channel information; x is the signal sent by the transmitter The signal can be the DMRS sent by the network device; n is the noise, which can be a set known quantity. Further, the terminal device can infer the downlink signal sent by the network device through the channel based on the channel estimation result, that is, the terminal device can recover x based on the channel H, for example, ignoring channel noise, x=H ^-1 y. Here, x indicates the downlink signal sent by the network equipment, and the downlink signal also experiences the channel H, and y indicates the downlink signal received by the terminal equipment.

(6) Precoding and codebook

In a communication system with multiple antennas, such as a multiple input multiple output (MIMO) system, the signals of multiple transmitting antennas will be superimposed on any receiving antenna, so the method of transmitting signals by the transmitting end affects the system performance. performance, and it is often complicated when the receiver recovers the transmitted signal that has experienced the MIMO channel. In this context, precoding can be introduced to deform the linear channel model as: y=HPx+n, where y is the received signal, H is the MIMO channel, x is the transmitted signal, n is noise, and P indicates precoding. As an implementation manner, P can be selected from a predefined matrix (or vector) set, and the set is called a codebook (Codebook). Then, the method in which the transmitter sends a signal is also called a codebook-based transmission method. As another implementation, if the sender can know all the information of H, and P can also be obtained by the sender, the method of sending the signal by the sender is also called the non-codebook sending method (non-codebook, NCB). There are two ways of precoding: open loop or closed loop. In the open-loop mode, the sender determines the precoding codebook to be sent by itself. In the closed-loop mode, the transmitting end determines the precoding codebook to send based on the feedback information/or indication information of the receiving end. The introduction of precoding (Precoding) is used on the one hand to reduce system overhead and maximize the system capacity of MIMO, and on the other hand, it is used to reduce the complexity of the implementation of eliminating the influence between channels at the receiving end. However, it should be noted that the introduction of precoding means that the receiver also performs channel estimation through DMRS, but the estimated channel is actually the HP defined by the sender to introduce precoding. When applied to the downlink transmission process, the above-mentioned sending end may specifically be a network device, and the receiving end may specifically be a terminal device.

(7) Transmission resources

The transmission resources involved in the embodiments of the present application include time domain resources and frequency domain resources. The time domain resource may refer to any one of the following: a time slot, or a bundle of multiple time slots (bundle, group), where one time slot includes multiple consecutive orthogonal frequency division multiplexing (orthogonal frequency divided multiplexing, OFDM) ) symbol, the number of OFDM symbols is related to the subcarrier spacing (SCS). The frequency domain resource may refer to any one of the following: resource blocks, resource block groups, and precoding resource block groups. A resource block (RB): also called a physical resource block (PRB), is a basic unit of frequency resources in an OFDM-based communication system. A resource block generally consists of N resource elements (resource elements, REs), and one resource element is also called one subcarrier. where N is generally 12. Several resource blocks form a resource block group (RBG), or also called a physical resource block group. In general, precoding is performed in units of resource blocks or resource block groups, and the basic unit for precoding transmission is also called a precoding resource block group (Precoding Resource Block Group, PRG). One precoded resource block group may not be smaller than one resource block group. The number of resource blocks RB or resource element groups REG included in the precoding resource block group can be represented by the precoding granularity.

For the PDCCH, the composition of N resource elements (resource elements, REs) may also be referred to as resource element groups (resource element groups, REGs).

(8) Control resource collection and search space

The transmission resources involved in the downlink transmission process can be divided into a control area available for transmission of downlink control channels and a data area available for transmission of downlink data channels. As shown in FIG. 1 is a schematic structural diagram of a transmission resource, where the transmission resource distinguishes a control area and a data area. The control region includes time domain resources and frequency domain resources that can be occupied by downlink control channels, and the data region includes time domain resources and frequency domain resources that can be occupied by downlink data channels. As an implementation manner, the location where the PDCCH exists may be determined in the control region, and the location where the PDSCH exists may be determined in the data region.

A control resource set (control-resource set, CORESET) is a piece of time-frequency resource within the control area. A CORESET corresponds to a group of terminal equipment, terminal equipment or user equipment (UE). It is also illustrated in Figure 1 that CORESET 1 and CORESET 2 are included in the control area. Exemplarily, if CORESET 1 corresponds to UE1, UE2, UE3 and UE4, and CORESET2 corresponds to UE4, UE5, UE6 and UE7. Then the PDCCHs of UE1, UE2, UE3 and UE4 can be sent on CORESET 1, and the PDCCHs of UE4, UE5, UE6 and UE7 can be sent on CORESET 2. In addition, one terminal device may also correspond to multiple CORESETs, and the numerology (parameter sets) on these CORESETs may be the same or different. The parameter set here includes subcarrier spacing SCS and cyclic prefix (cyclic prefix, CP) length. For example, there exists UE8 corresponding to CORESET 1 and CORESET 2, and the PDCCH of UE8 may be sent on CORESET 1 and/or CORESET 2. For any terminal device in a group of terminal devices corresponding to a CORESET, any terminal device has its corresponding search space (search space) on the CORESET, and the resources of the search space are less than or equal to the resources of the CORESET. Taking the aforementioned UE1 as an example, specifically, the PDCCH of the UE1 may be sent in the search space corresponding to the UE1 on the CORESET 1. As above, it should be noted that one CORESET can be bound to multiple SearchSpaces, but one SearchSpace can only be bound to one CORESET.

As an implementation manner, CORESET is used to indicate the time and frequency range in the time slot where the PDCCH may exist. The search space SearchSpace is used to determine the time slots and OFDM symbol positions where the PDCCH may exist. A CORESET and a SearchSpace can be bound to determine the PDCCH configuration.

The following describes the configuration of the main parameters of the control resource set with reference to Table 1.

Table 1

Further explanations are being made on CCE and REG. One CCE is composed of 6 REGs, and one REG corresponds to one resource block RB on one OFDM symbol, that is, one REG includes resources corresponding to one symbol in the time domain and one RB in the frequency domain. The resources possibly occupied by the PDCCH and the resources actually occupied by the PDCCH can be described by the CCE.

The following describes the main parameter configuration of the search space in conjunction with Tables 2 to 3.

Table 2

Among them, the following Table 3 shows that SearchSpace has many types:

table 3

Further explanation about PDCCH candidate. After the terminal device determines the candidate time-frequency position of the PDCCH according to the SearchSpace and CORESET configuration, the UE does not know which CCE the PDCCH will be sent on, so it needs to perform blind detection in sequence. The PDCCH candidate is in these candidate time-frequency positions, which may include the position of the UE PDCCH. In order to reduce the number of blind detections of the UE, the network (network) will place these PDCCHs according to some rules, and the terminal device can reduce the number of blind detections according to some rules.

(9) Relationship between demodulation reference signal DMRS and downlink signal

In the downlink transmission process, the demodulation reference signals can be divided into demodulation reference signals associated with downlink control channels and demodulation reference signals associated with downlink data channels. In the embodiments of the present application, the first demodulation reference signal is used to represent the demodulation reference signal associated with the downlink control channel, and the second demodulation reference signal is used to represent the demodulation signal associated with the downlink data channel.

The transmission mode of the first demodulation reference signal and the downlink control channel is the same, and the transmission mode of the second demodulation reference signal and the downlink data channel is the same.

For example, the downlink control channel is the PDCCH, and the first demodulation reference signal may be the DMRS associated with the PDCCH, or simply referred to as the PDCCH DMRS. (a) in Figure 2 shows the distribution of PDCCH DMRS in one REG. It can be seen that the REG includes 12 resource elements (REs), the density of PDCCH DMRS is fixed at 1/4, and Time starts from the second RE of a REG. For the DMRS associated with the PDCCH, the channel experienced by the PDCCH symbol on a certain antenna port can be derived from the channel experienced by the DMRS symbol on the same antenna port, where the DMRS symbol associated with the PDCCH and the PDCCH symbol use the same precoding Transmission resources, or DMRS symbols associated with PDCCH and PDCCH symbols are in the same frequency resource, the same OFDM symbol (slot), and the same precoding resource block group (PRG). It can be understood that the frequency domain precoding granularity of PDCCH and PDCCH DMRS can be consistent with the precoding granularity of the CORESET where they are located.

For example, the downlink control channel is the PDSCH, and the second demodulation reference signal may be the DMRS associated with the PDSCH, or simply referred to as the PDSCH DMRS. (b) in Figure 2 shows the distribution of PDSCH DMRS in one RB using configuration type 1. It can be seen that the RB includes 12 resource elements (RE), PDSCH The density of DMRS is fixed at 1/2 and starts from the first RE of a REG in time. (c) in Figure 2 shows the distribution of PDSCH DMRS in one RB using configuration type 2. It can be seen that the RB includes 12 resource elements (RE), PDSCH The density of DMRS is fixed at 2/6, and two consecutive REs start from the first RE of a REG in time. For the DMRS associated with PDSCH, the channel experienced by the PDSCH symbol on a certain antenna port can be derived from the channel experienced by the DMRS symbol on the same antenna port. time slot, the same precoding block group (precoding resource block group, PRG).

It should be noted that the PDCCH DMRS shown in (a) in Figure 2, the PDSCH DMRS shown in Figure 2 (b), and the PDSCH DMRS shown in Figure 2 (c) mainly distinguish the distribution positions of PDCCH DMRS and PDSCH DMRS are different, Although the three use the same pattern to represent the PDCCH DMRS/PDSCH DMRS, it is only an example, and does not mean that the precoding of the three is limited to be the same.

In addition, for the PDSCH DMRS corresponding to messages (PBCH, SIB1, paging message, message 2, message 4, other system messages, RRC configuration messages, etc.) in the downlink broadcast/multicast/initial access process, configuration type 1 is mainly used. (configuration type 1), for downlink messages other than SIB1 (such as message 2, message 4, paging message, other system messages, RRC configuration messages, etc.), its PDSCH DMRS can also be configured as configuration type 2 (configuration type 2 ). These downlink messages will be explained in the subsequent content.

At present, the network device independently transmits the PDCCH and the PDCCH DMRS in the channel of a certain antenna port, and transmits the PDSCH and the PDSCH DMRS in the channel of another certain antenna port. The terminal device demodulates the PDCCH through the PDCCH DMRS, then obtains the PDSCH and PDSCH DMRS based on the demodulated PDCCH, and demodulates the PDSCH through the PDSCH DMRS. The network equipment independently transmits PDCCH DMRS and PDSCH DMRS, occupying resource elements, but the resource elements occupied by it cannot carry the bit information of the upper layer, which consumes transmission resources and makes the overhead larger. Based on this, the embodiment of the present application provides a method for transmitting downlink signals. By setting PDSCH DMRS and PDCCH DMRS multiplexing, the PDCCH DMRS can be used for PDSCH demodulation, reducing the resources occupied by the transmission PDSCH DMRS, and reducing the need for transmission resources. consumption and related costs.

The downlink signal transmission method provided in the embodiment of the present application can be applied to the communication system architecture as shown in FIG. 3 , where the communication system includes a network device and a terminal device.

The first demodulation reference signal configured by the network device can be used to demodulate the downlink control channel and the downlink data channel. The terminal device may demodulate respectively according to the first demodulation reference signal when receiving the downlink control channel from the network device and receiving (acquiring) the downlink data channel from the network device based on the downlink control channel. downlink control channel and downlink data channel; or, the terminal device may first receive the downlink control channel from the network device, that is, first demodulate the downlink control channel according to the first demodulation reference signal, and then based on the control channel in the downlink control channel information, receive (acquire) the downlink data channel from the network device, and demodulate the downlink data channel according to the first demodulation reference signal.

In addition, the network device may also indicate to the terminal device the transmission mode related to the downlink data channel, such as transmission resources, precoding, and precoding granularity. Then, the terminal device can demodulate part or all of the downlink data channel according to the first demodulation reference signal in combination with the instruction of the network device.

Scenarios to which the embodiments of the present application can be applied are described below. Referring to FIG. 4, taking the interaction flow of information transmission between a network device and a terminal device in 5G NR as an example, the downlink transmission involved in the embodiment of the present application includes the process of the network device sending a downlink message to the terminal device in the following steps. The transmission of the downlink message It involves PDCCH and PDSCH, such as PBCH, SIB1, paging message, message 2, message 4, other system messages, radio resource control (Radio resource control, RRC) configuration messages, etc. RRC configuration messages include (such as RRC Reconfiguration, RRC Connection Reconfiguration, etc. Among them, PDCCH is responsible for transmitting PDSCH-related scheduling and configuration information, for example, indicated by DCI. PDSCH is responsible for carrying downlink data.

The specific interaction flow of information transmission between the network device and the terminal device is as follows:

P100: A network device (or a base station) sends a synchronization signal at a specific location. In NR, the synchronization signal sent by the network device is called a synchronization/broadcast signal block (synchronization signal/Physical broadcast channel block, abbreviated as SS/PBCH block, and abbreviated as SSB), and the SS/PBCH block is periodically sent by the network device. The content carried by the physical broadcast channel is called a master information block (MIB), which indicates the search space (ie, searchSpaceZero) and control resource set (ie, controlResourceSetZero) of the SIB1.

After the UE (terminal/user equipment, User equipment) is powered on or needs to re-access the network, it scans the synchronization signal of the network device, performs downlink time and frequency synchronization, and simultaneously receives configuration information about random access resources in the system information.

P101: The network device sends system information at a specific location (send by broadcasting), and the signal carrying the system information is also called a system information block (SIB). In particular, the system information block No. 1 (SIB1) carries information such as random access configuration information, message 2/message 4, and other PDCCH search spaces (SearchSpace1).

P101b: The network device periodically sends paging information in the paging time window, and the terminal in the idle state periodically monitors the paging information, that is, searches for the PDCCH corresponding to the paging information, where the PDCCH is identified by the paging-wireless network temporary identifier (paging radio network temporary identifier, P-RNTI) scrambling. The load of the paging information is carried by the PDSCH, and the corresponding PDCCH indicates the time-frequency position where the PDSCH is located.

P102: The terminal selects a random access resource associated with the SSB according to the random access resource configuration information and the synchronized SSB, and the resource includes time, frequency resources, and code domain resources (random access preamble), and uses the random access resource. The access resource sends a random access signal, also called message 1 (Msg1). In NR, the association between the SSB and the random access resource enables the network device to acquire the downlink beam for sending message 2 and/or after detecting the random access preamble. Accordingly, the network device will attempt to receive the random access preamble.

P103: After receiving the message 1 sent by the UE, the network device estimates the timing advance of the UE according to the preamble sent by the user, and replies to the user with message 2 (Msg2), which includes the message 2 used by the UE to send message 3 (Msg3) Configuration information such as the location of time-frequency resources for conflict resolution, and the modulation and coding methods. The random access response (RAR) can be called message 2 at both the physical layer and the medium access control (MAC) layer. However, at the physical layer, it is also generally referred to as a response message corresponding to a specific random access preamble (eg, sent by the terminal); while at the MAC layer, it is a response message corresponding to a random access opportunity or multiple random access opportunities. , the combination of all random access preamble response messages detected by the network device is packaged in the form of MAC data units. After the terminal sends the random access preamble message 1, it will try to detect the message 2 within the random access response time window. It should be noted that the PDCCH search space corresponding to message 2 or message 4 in P105 here is SearchSpace1 mentioned in P101. If not configured in P101, it is the same as the search space/control resource set of SIB1 in P100.

P104: After receiving the message 2, the UE sends the message 3 in the corresponding time-frequency resource according to the configuration in the message 2.

P105: After receiving the message 3, the network device replies to the user with a message 4 (Msg4), indicating that the terminal device has successfully accessed.

The communication systems and application scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application.

The multiple involved in the embodiments of the present application refers to two or more. "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate that A exists, A and B exist at the same time, and B exists. The character "/" generally indicates that the associated objects are an "or" relationship. In addition, it should be understood that although the terms first, second, etc. may be used to describe various objects in the embodiments of the present application, these objects should not be limited by these terms. These terms are only used to distinguish each object from one another.

The terms "comprising" and "having" and any variations thereof mentioned in the description of the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes other unlisted steps or units, or optionally also Include other steps or units inherent to these processes, methods, products or devices. It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

The method for downlink signal transmission provided by the embodiments of the present application and the interaction process between the network device and the terminal device involved in different methods are described in detail below.

Method 1: Use a predefined method to set one or more of the following conditions: the downlink control channel and the downlink data channel use the same transmission mode; the first link associated with the downlink control channel and the downlink data channel; The second demodulation reference signal adopts the same transmission mode; the first demodulation reference signal and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the first demodulation reference signal and the downlink data channel If the modulation reference signal adopts the same transmission mode, the first demodulation reference signal can be used to demodulate the downlink control channel and the downlink data channel.

Wherein, using the same transmission mode includes using the same transmission resources (which may also be partially the same), the same precoding, and the same precoding granularity. In addition, using the same transmission resources can also be understood as: using the same time and frequency, time can refer to any one of the following: time slot, or a bundle of multiple time slots; frequency can refer to any one of the following: resource block, resource Block group; using the same precoding and the same precoding granularity can also be understood as: using the same precoding resource block group. The use of the same transmission mode may also indicate the use of the same transmit beam (antenna port). When the transmission resource part is the same, it may be on the same transmission resource, and the first demodulation reference signal can be used to demodulate the downlink control channel and the downlink data channel. Exemplarily, the downlink control channel is PDCCH, the first demodulation reference signal is PDCCH DMRS; the downlink data channel is PDSCH, and the second demodulation reference signal is PDSCH DMRS as an example, the DMRS or DMRS at the CORESET position where the PDCCH is located can also be pre-defined. PDCCH DMRS can be used to demodulate PDCCH and PDSCH, and the first condition must be satisfied. Or predefine the PDSCH DMRS and its associated PDSCH, and the PDCCH that schedules the PDSCH, the channel that the PDSCH symbol on a certain antenna port traverses can be from the PDCCH that schedules the PDSCH (or the CORESET where the PDCCH is located) The associated DMRS experienced. The channel, and/or derived from the channel experienced by the PDCCH that schedules the PDSCH, needs to satisfy the first condition. The first condition includes at least one of the following: (1) PDSCH DMRS symbols and PDSCH symbols are in the same (frequency) resource, same time slot, same precoding resource block group. (2) The PDSCH symbol and the PDCCH DMRS (or the DMRS in the CORESET where the PDCCH is located) are in the same (frequency) resource, the same time slot, and the same precoding resource block group. (3) The PDSCH symbol and the PDCCH (or CORESET where the PDCCH is located) symbol are in the same (frequency) resource, the same time slot, and the same precoding resource block group. (4) The antenna port of the PDSCH has a corresponding relationship with the antenna port of the PDCCH DMRS (or the DMRS in the CORESET where the PDCCH is located). (5) The antenna port of PDSCH has a corresponding relationship with the antenna port of PDCCH.

5 is a schematic flowchart of a downlink signal transmission method, the method includes the following steps:

S501a: The network device sends the first demodulation reference signal and the downlink control channel to the terminal device. The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel scheduled by the downlink control channel.

S501b: The network device sends the downlink data channel scheduled by the downlink control channel to the terminal device. It should be noted that S501a and S501b do not distinguish the order of priority.

S502: The terminal device acquires the downlink control channel and the first demodulation reference signal, and demodulates the downlink control channel by using the first demodulation reference signal.

S503: The terminal device acquires the downlink data channel based on the demodulated downlink control channel, and demodulates the downlink data channel according to the first demodulation reference signal.

In this embodiment of the present application, by setting the downlink data channel, the downlink control channel that schedules it, and the demodulation reference signal associated with the downlink control channel in the same transmission mode, the demodulation reference signal associated with the downlink control channel can be used to demodulate downlink data. channel, the network device does not need to send the demodulation reference signal associated with the downlink data channel to the terminal device, which reduces the occupation of transmission resources, reduces the DMRS overhead and reduces the demodulation (detection) complexity.

Method 2: The network device sends the downlink control channel, the first demodulation reference signal, and the downlink data channel in the same transmission mode, and sends first indication information to the terminal device, where the first indication information is used to indicate one of the following or more: (1) The downlink control channel and the downlink data channel adopt the same transmission mode. (2) The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode. (3) The first demodulation reference signal and the downlink data channel use the same transmission mode. (4) The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode. Then, according to the first indication information, the terminal device can determine that the first demodulation reference signal can be used to demodulate the downlink control channel and the downlink data channel.

Optionally, the network device may send the first indication information before sending the first demodulation reference signal and/or the downlink control channel to the terminal device; alternatively, the network device may also use the downlink control channel to carry the first indication information, and the downlink control The channel carries the first indication information, and the first indication information is sent to the terminal device. Exemplarily, taking the downlink control channel as the PDCCH as an example, the first indication information may be specifically carried in the DCI, and the first indication information may specifically be a field defined in the DCI.

To sum up, referring to the schematic flowchart of a downlink signal transmission method shown in FIG. 6 , the method includes the following steps:

S601a: The network device sends the first demodulation reference signal and the downlink control channel to the terminal device. The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel scheduled by the downlink control channel, and the downlink control channel carries the aforementioned first indication information.

S601b: The network device sends the downlink data channel scheduled by the downlink control channel to the terminal device. It should be noted that S501a and S501b do not distinguish the order of priority.

S602: The terminal device obtains the downlink control channel and the first demodulation reference signal, demodulates the downlink control channel by using the first demodulation reference signal, obtains first indication information, and determines based on the first indication information that the first demodulation reference signal can be used for Demodulate downlink control channel and downlink data channel.

S603: The terminal device acquires the downlink data channel based on the demodulated downlink control channel, and demodulates the downlink data channel according to the first demodulation reference signal.

In the embodiment of the present application, the network device transmits the demodulation reference signal associated with the downlink data channel, the downlink control channel and the downlink control channel that schedule it in the same transmission mode, and indicates to the terminal device that the related transmission mode is the same. This enables both parties in the communication to know that the demodulation reference signal associated with the downlink control channel can be used to demodulate the downlink data channel. Then the network device does not need to send the demodulation reference signal associated with the downlink data channel to the terminal device, which reduces the occupation of transmission resources, reduces the DMRS overhead and reduces the demodulation (detection) complexity.

Method 3: On the basis of method 1 or method 2, the network device may further send a second demodulation reference signal associated with the downlink data channel. Then, the terminal device can demodulate the downlink data channel according to the first method or the second method, or can demodulate the downlink data channel by using the second demodulation reference signal. The terminal device demodulates the downlink data channel in combination with the first demodulation reference signal and the second demodulation reference signal, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the network device may directly and explicitly indicate to the terminal device the transmission resources occupied by the second demodulation reference signal, for example, the network device sends second indication information to the terminal device, the second The indication information is used to indicate whether there is a second demodulation reference signal in the transmission resource except the time domain position occupied by the downlink control channel, the number of the second demodulation reference signal, the time domain resource position of the second demodulation reference signal and/ or one or more of the frequency domain resource locations. The transmission resource here indicates the same transmission resource used by the second demodulation reference signal and the first demodulation reference signal, downlink control channel and downlink data channel. For the definition of this transmission resource, please refer to Method 1 for understanding. This is not repeated in the application embodiment.

In another optional implementation manner, the network device may indicate the transmission resources occupied by the second demodulation reference signal to the terminal device in an implicit and indirect manner. For example, the network device sends second indication information to the terminal device, where the second indication information includes information used to indicate the first time domain offset, so as to realize the time domain resource location of the second demodulation reference signal instructions. The first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel (for example, the time domain resource start of the downlink control channel) position or the end position of the time domain resource of the downlink control channel), or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the first demodulation the distance between the time domain resource positions of the reference signal, or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource start of the downlink data channel The distance between locations (or, where the temporal resource ends).

Based on this embodiment, the time domain position of the second demodulation reference signal can be adjusted according to different channel conditions, so as to better match the channel and make the demodulation performance better. For example, in a scenario with high mobility, the channel time variation will be relatively large, so the distance between the second demodulation reference signal and the first demodulation reference can be slightly larger, so that the estimated channel is more accurate and the demodulation performance is improved. better.

Optionally, the network device may send the foregoing second indication information before sending the first demodulation reference signal and/or the downlink control channel to the terminal device; or, the network device may also use the downlink control channel to carry the second indication information, as follows: The second indication information is sent to the terminal device in a manner of carrying the second indication information in the control channel. Exemplarily, taking the downlink control channel as the PDCCH as an example, the second indication information may be specifically carried in the DCI, and the second indication information may specifically be a field defined in the DCI. It should be noted that, on the basis of method 2, the first indication information and the second indication information may be carried in the DCI and sent together, or carried in other messages (for example, RRC messages) and sent to the terminal together equipment. In addition, the second indication information and the first indication information can also be regarded as or combined into one piece of information, which can indicate the content indicated by the first indication information or the content indicated by the second indication information. This embodiment of the present application This is not limited.

Referring to a schematic flowchart of a downlink signal transmission method shown in FIG. 7 , the method includes the following steps:

S701a: The network device sends the first demodulation reference signal and the downlink control channel to the terminal device. The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel scheduled by the downlink control channel. Optionally, the downlink control channel carries the foregoing first indication information and/or second indication information.

S701b: The network device sends the downlink data channel scheduled by the downlink control channel and the second demodulation reference signal associated with the downlink data channel to the terminal device. It should be noted that S501a and S501b do not distinguish the order of priority.

S702: The terminal device acquires the downlink control channel and the first demodulation reference signal, and demodulates the downlink control channel by using the first demodulation reference signal. Optionally, the terminal device may also obtain the first indication information and/or the second indication information, and determine based on the first indication information and/or the second indication information that the first demodulation reference signal can be used to demodulate the downlink control channel and downlink data. channel.

S703: The terminal device acquires the downlink data channel and the second demodulation reference signal based on the demodulated downlink control channel, and demodulates the downlink data channel according to the first demodulation reference signal and the second demodulation reference signal.

For example, the downlink control channel is PDCCH, the first demodulation reference signal is PDCCH DMRS, the downlink data channel is PDSCH, and the second demodulation reference signal is PDSCH DMRS. Referring to a schematic diagram of a demodulation reference signal distribution shown in FIG. 8a, it shows that the transmission mode of PDSCH is the same as that of PDCCH (or the CORESET where it is located), and there is no PDSCH DMRS in the non-PDCCH position in the time slot where the PDSCH is located. , that is, the second indication information may be used to indicate that there is no PDSCH DMRS in the non-PDCCH position in the time slot where the PDSCH is located in the same transmission resource. Then the terminal device receives the second indication information, and can demodulate the PDSCH according to the PDCCH DMRS sent by the network device.

For example, the downlink control channel is PDCCH, the first demodulation reference signal is PDCCH DMRS, the downlink data channel is PDSCH, and the second demodulation reference signal is PDSCH DMRS. Referring to Fig. 8b, it is shown that the transmission mode of PDSCH is the same as that of PDCCH (or the CORESET where it is located), the PDSCH DMRS exists in the non-PDCCH position in the time slot where the PDSCH is located, and the position of the PDSCH DMRS is the same as that of the PDCCH DMRS (or where the PDCCH is located). The CORESET) interval is K3 OFDM symbols. The K3 OFDMs are the aforementioned first time domain offsets. Then the second indication information may include K3, to indicate the time domain resource position of the PDSCH DMRS relative to the time domain position of the PDCCH, and the network equipment sends the second indication information to indicate that the network equipment has sent the PDSCH DMRS in an implicit manner. , so that the terminal device knows that the PDSCH can be demodulated according to the PDCCH DMRS and PDSCH DMRS sent by the network device, so as to improve the detection performance of the PDSCH. The case of K3=7 is specifically illustrated in FIG. 8b. However, it should be noted that the embodiment of the present application does not limit the value of K3, and the embodiment of the present application does not limit the first time-domain offset, and the first time-domain frequency shift may be embodied in the OFDM is represented by K3 OFDMs; the first time-domain frequency shift amount may also be an offset on a time slot, or the like.

It should be understood that in this application (eg, method 1, method 2, or method 3), the bandwidth of the downlink data channel may be smaller than the bandwidth of the downlink control channel (or the CORESET where the downlink control channel is located). Further, the location of the frequency resource block where the downlink data channel is located (or the set of indexes of resource blocks) belongs to a subset of the location of the frequency resource block of the downlink control channel (or the CORESET where the downlink control channel is located).

Method 4: The network device sends the downlink control channel, the first demodulation reference signal, and the downlink data channel to the terminal device, and sends third indication information to the terminal device, where the third indication information is used to indicate the preset of the downlink control channel. One or more of the coding granularity, the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second A demodulation reference signal is associated with the downlink data channel. The terminal device may demodulate part or all of the downlink data channel sent by the network device according to the third indication information and the first demodulation reference signal.

Optionally, the network device may send the third indication information before sending the first demodulation reference signal and/or the downlink control channel; alternatively, the network device may also use the downlink control channel to carry the third indication information, which is carried in the downlink control channel. By means of the third indication information, the third indication information is sent to the terminal device. Exemplarily, taking the downlink control channel as the PDCCH as an example, the third indication information may be specifically carried in the DCI, and the first indication information may specifically be a field defined in the DCI.

Optionally, the terminal device can demodulate part or all of the downlink data channel sent by the network device according to the third indication information and the first demodulation reference signal, which can be implemented by referring to the following manner: Three indication information and the downlink control channel demodulated by the first demodulation reference signal, determine the transmission mode of the downlink data channel or the transmission mode of the second demodulation reference signal, the transmission mode includes precoding, One or more of precoding granularity and transmission resources. Further, the terminal device determines whether the transmission mode of the downlink control channel (or the first demodulation reference signal) is the same as the transmission mode of the downlink data channel (or the second demodulation reference signal). The reference signal demodulates part of the downlink data channel sent by the network device; when all are the same, the terminal device can demodulate all of the downlink data channel sent by the network device according to the first demodulation reference signal.

The following describes in detail how the terminal device determines the transmission mode of the downlink data channel or the transmission mode of the second demodulation reference signal in different situations indicated by the third indication information sent by the network device.

The first case: a pre-defined way is used to set the network equipment and the terminal equipment to know the following relationship: the precoding granularity of the downlink control channel is related to the precoding granularity of the downlink data channel; or, the downlink control channel The precoding granularity of the channel is related to the precoding granularity of the second demodulation reference signal; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the downlink data channel; or, the The precoding granularity of the first demodulation reference signal is related to the precoding granularity of the second demodulation reference signal. The first demodulation reference signal and the downlink control channel use the same precoding granularity, and the second demodulation reference signal and the downlink data channel use the same precoding granularity. For example, the precoding granularity of PDCCH DMRS and PDCCH is the same, the precoding granularity of PDCCH is K1 REGs, and K1 can be any one of 2, 3, 4, 6, and bandwidth; PDSCH DMRS and PDSCH have the same precoding granularity, PDSCH The precoding granularity is K2 RBs (REGs), and K2 can take any of the values 2 and 4. It can be pre-defined that when the precoding granularity of PDCCH is 2 REGs, the precoding granularity of PDSCH is 2 RBs; when the precoding granularity of PDCCH is 4 REGs, the precoding granularity of PDSCH is 4 RBs; the precoding granularity of PDCCH is 4 RBs. When there are 3 REGs, the precoding granularity of PDSCH is 2 RBs; when the precoding granularity of PDCCH is 6 REGs, the precoding granularity of PDSCH is 3 RBs.

The third indication information sent by the network device indicates any one of the precoding granularity of the downlink control channel and the precoding granularity of the first demodulation reference signal. The third indication information is to determine other precoding granularities not indicated by the network device. For example, the third indication information sent by the network device indicates the precoding granularity of the downlink control channel, and the terminal device can determine the precoding granularity of the downlink data channel, the precoding granularity of the second demodulation reference signal, and the first demodulation reference signal. precoding granularity.

Taking the transmission mode of the downlink data channel determined by the terminal device as an example, if the precoding granularity of the downlink data channel known by the terminal device is the same as the precoding granularity of the first demodulation reference signal, the terminal device determines that the downlink data channel is the same as the first demodulation reference signal. The reference signal adopts the same precoding resource block group, and the terminal device can demodulate all the downlink data channels sent by the network device according to the first demodulation reference signal, or demodulate all the downlink data channels sent by the network device according to the first demodulation reference signal, and The downlink data channel is the same as the frequency position (or frequency domain resource) of the first demodulation reference signal. For example, as shown in Figure 9a, the vertical direction represents the time domain dimension, the horizontal direction represents the frequency domain dimension, the PDCCH and PDCCH DMRS are located in the 0th OFDM symbol, and the PDSCH and PDSCH DMRS start from the 1st OFDM symbol (the number of continuous OFDM symbols is not limited). The precoding granularity of PDCCH is K1 REGs, and K1 is 2; the precoding granularity of PDSCH is K2 REGs (or RBs), and K2 is 2. The precoding resource block group of PDCCH and the precoding resource block group of PDSCH at the same frequency position use the same precoding, as shown in Figure 9a with the same pattern, PDSCH PRG j and PDCCH precoding (precoding) REG group j are used The precoding is the same, and the precoding used by PDSCH PRG j+1 and PDCCH precoding (precoding) REG group j+1 is the same. The terminal device can demodulate all of the PDSCH sent by the network device according to the PDCCH DMRS, or demodulate the downlink data channel sent by the network device according to the first demodulation reference signal and having the same frequency position as the first demodulation reference signal.

Taking the transmission mode of the downlink data channel determined by the terminal device as an example, if the precoding granularity of the downlink data channel known by the terminal device is different from the precoding granularity of the first demodulation reference signal, and the terminal device determines that the downlink data channel is different from the precoding granularity of the first demodulation reference signal The precoding resource block group used by the reference signal is partially overlapped, and the terminal device can demodulate the downlink data channel in the overlapped part according to the first demodulation reference signal of the overlapped part.

For example, as shown in Figure 9b, the vertical dimension represents the time domain dimension, and the horizontal dimension represents the frequency domain dimension. The PDCCH and PDCCH DMRS are located in the 0th OFDM symbol, and the PDSCH and PDSCH DMRS start from the 1st OFDM symbol (the number of continuous OFDM symbols is not limited). The precoding granularity of PDCCH is K1 REGs, and K1 is 3; the precoding granularity of PDSCH is K2 REGs (or RBs), and K2 is 2. The precoding resource block group of PDCCH and the precoding resource block group of PDSCH partially overlap, as shown in Figure 9b, PDSCH PRG j, PDCCH precoding (precoding) REG group j: PDCCH precoding (precoding) REG group j includes PDSCH PRG j, the precoding of the overlapping part, that is, the PDSCH PRG j, is the same as the precoding of the PDCCH precoding (precoding) REG group j. In FIG. 9b, the same pattern is used to indicate that the precoding is the same. The terminal equipment can demodulate the PDSCH in the PDSCH PRG j according to the PDCCH DMRS. In addition, for the precoding of PDSCH PRG j+1, it can be set that the precoding of PDSCH PRG j+1 is the same as the precoding method of the PDCCH corresponding to the position of the smallest RB in the precoding of PDSCH PRG j+1, as shown in Figure 9b It is also shown that the precoding of PDSCH PRG j+1 is the same as the precoding of PDCCH precoding (precoding) REG group j. The terminal device may determine the precoding of PDSCH PRG j+1 based on the setting.

As shown in Fig. 9c, the vertical dimension represents the time domain dimension, and the horizontal dimension represents the frequency domain dimension. The PDCCH and PDCCH DMRS are located in the 0th OFDM symbol, and the PDSCH and PDSCH DMRS start from the 1st OFDM symbol (the number of continuous OFDM symbols is not limited). The precoding granularity of PDCCH is K1 REGs, and K1 is 3; the precoding granularity of PDSCH is K2 REGs (RBs), and K2 is 2. The precoding resource block group of PDCCH and the precoding resource block group of PDSCH partially overlap, as shown in FIG. 9c , PDSCH PRG j, PDCCH precoding (precoding) REG group j. The PDCCH precoding (precoding) REG group j includes the PDSCH PRG j, and the precoding of the overlapping part, that is, the PDSCH PRG j is the same as the precoding of the PDCCH precoding (precoding) REG group j. In Figure 9c, the same pattern is used to indicate that the precoding is the same. The terminal equipment can demodulate the PDSCH in the PDSCH PRG j according to the PDCCH DMRS. In addition, for the precoding of PDSCH PRG j+1, the precoding of PDSCH PRG j+1 can be set to be the same as the precoding method of the PDCCH corresponding to the position of the largest RB in the precoding of PDSCH PRG j+1, as shown in Figure 9c It is also shown that the precoding of PDSCH PRG j+1 is the same as the precoding of PDCCH precoding (precoding) REG group j+1, and the terminal device can determine the precoding of PDSCH PRG j+1 based on this setting.

As shown in Fig. 9d, the vertical dimension represents the time domain dimension, and the horizontal dimension represents the frequency domain dimension. The PDCCH and PDCCH DMRS are located in the 0th OFDM symbol, and the PDSCH and PDSCH DMRS start from the 1st OFDM symbol (the number of continuous OFDM symbols is not limited). The precoding granularity of PDCCH is K1 REGs, and K1 is 3; the precoding granularity of PDSCH is K2 REGs (RBs), and K2 is 2. The precoding resource block group of PDCCH and the precoding resource block group of PDSCH partially overlap, as shown in FIG. 9d, PDSCH PRG j, PDCCH precoding (precoding) REG group j. The PDCCH precoding (precoding) REG group j includes the PDSCH PRG j, and the precoding of the overlapping part, that is, the PDSCH PRG j is the same as the precoding of the PDCCH precoding (precoding) REG group j. In Figure 9d, the same pattern is used to indicate that the precoding is the same. The terminal device can demodulate the PDSCH in the PDSCH PRG j according to the PDCCH DMRS. In addition, the precoding for PDSCH PRG j+1 is not set, and the network device side can send it arbitrarily.

In another implementation manner, the precoding resource block group of the PDCCH and the precoding resource block group of the PDSCH have partially overlapping precoding, and the terminal device may determine the precoding of the non-overlapping part according to the precoding of the overlapping part. For example, in Figure 9d, PDSCH PRG j partially overlaps with PDCCH REG group j, that is, PDSCH PRG j. The terminal equipment can determine the precoding P1 of PDSCH PRG j+1 according to the precoding P0 of the PDCCH REG group j (or the precoding P0 of the PDSCH PRG j), which is denoted as P1=P×P0; The precoding vector determined by the configuration information; for example,

In this way, the indication overhead of PDSCH precoding can be reduced, and at the same time, through more flexible precoding, the diversity of PDSCH can be increased, and the transmission performance can be improved.

It should be understood that in this application (for example, method 4), the bandwidth of the downlink data channel may be different from the bandwidth of the downlink control channel (or the CORESET where the downlink control channel is located). Further, only a part of the frequency resource block position where the downlink data channel is located (or the set of resource block indices) and the frequency resource block position of the downlink control channel (or CORESET where the downlink control channel is located) may be the same.

Case 2: The default precoding granularity of the second demodulation reference signal or the downlink data channel is set in a pre-defined manner. Wherein, the second demodulation reference signal and the downlink data channel use the same precoding granularity. For example, in NR, the precoding granularity of PDSCH corresponding to messages (PBCH, SIB1, paging message, message 2, other system messages, message 4, RRC configuration message, etc.) in the downlink broadcast/multicast/initial access process, the default for 2 RBs.

The third indication information sent by the network device indicates any one of the precoding granularity of the downlink control channel and the precoding granularity of the first demodulation reference signal. The precoding granularity of the downlink control channel is the same as the precoding granularity of the first demodulation reference signal. For example, in NR, the precoding granularity of PDCCH (or PDCCH DMRS) is the same as the CORESET precoding granularity where it is located. The CORESET precoding granularity configured by the network device can be 2, 4, 6 REGs, or the entire CORESET bandwidth, which is determined by the base station in the configured in SIB1. In addition, in NR, the terminal equipment can also assume that the CORESET precoding granularity corresponding to the paging message, message 2 and message 4 is exactly the same as the SIB1 CORESET precoding granularity, and can also be configured by the base station in SIB1. The terminal device may determine the precoding granularity of the downlink data channel and the second demodulation reference signal, and the precoding granularity of the downlink control channel and the first demodulation reference signal based on the third indication information and the aforementioned default precoding granularity. Further, the terminal device demodulates part or all of the downlink data channel sent by the network device according to the third indication information and the first demodulation reference signal, which can be implemented with reference to the example in the first case described above, which is not the case in the embodiment of the present application. Let's go into details.

The third case: the third indication information sent by the network device indicates any one of the precoding granularity of the downlink control channel, the precoding granularity of the first demodulation reference signal, and the downlink data Any one of the precoding granularity of the channel and the precoding granularity of the second demodulation reference signal. The precoding granularity of the downlink control channel is the same as the precoding granularity of the first demodulation reference signal; the precoding granularity of the downlink data channel is the same as the precoding granularity of the second demodulation reference signal. The terminal device may determine, based on the third indication information, the precoding granularity of the downlink data channel and the second demodulation reference signal, and the precoding granularity of the downlink control channel and the first demodulation reference signal. Further, the terminal device demodulates part or all of the downlink data channel sent by the network device according to the third indication information and the first demodulation reference signal, which can be implemented with reference to the example in the first case described above, which is not the case in the embodiment of the present application. Let's go into details.

Corresponding to the above three situations, referring to FIG. 10 , an embodiment of the present application provides a schematic flowchart of a downlink signal transmission method, and the method includes the following steps:

S1001a: The network device sends the first demodulation reference signal and the downlink control channel to the terminal device. The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel scheduled by the downlink control channel. Optionally, the third indication information is carried in the downlink control channel, and the content indicated by the third indication information is different in different situations, which can be understood with reference to the above three situations.

S1001b: The network device sends the downlink data channel scheduled by the downlink control channel to the terminal device. It should be noted that S501a and S501b do not distinguish the order of priority.

S1002: The terminal device acquires the downlink control channel and the first demodulation reference signal, and demodulates the downlink control channel by using the first demodulation reference signal. Optionally, the terminal device may also acquire third indication information.

S1003: The terminal device acquires the downlink data channel based on the demodulated downlink control channel, and demodulates part or all of the downlink data channel sent by the network device according to the first demodulation reference signal and the third indication information.

Method 5: On the basis of method 4, the network device may further send the second demodulation reference signal associated with the downlink data channel. Then, the terminal device can demodulate the downlink data channel according to method 4, or can demodulate the downlink data channel by using the second demodulation reference signal. The terminal device demodulates the downlink data channel in combination with the first demodulation reference signal and the second demodulation reference signal, which can improve the detection performance of the downlink data channel.

11, an embodiment of the present application provides a schematic flowchart of a downlink signal transmission method, and the method includes the following steps:

S1101a: The network device sends the first demodulation reference signal and the downlink control channel to the terminal device. The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel scheduled by the downlink control channel. Optionally, the downlink control channel carries the foregoing third indication information, and the content indicated by the third indication information may be implemented with reference to Method 4, which is not repeated in this embodiment of the present application.

S1101b: The network device sends the downlink data channel scheduled by the downlink control channel and the second demodulation reference signal associated with the downlink data channel to the terminal device. It should be noted that S501a and S501b do not distinguish the order of priority.

S1102: The terminal device acquires the downlink control channel and the first demodulation reference signal, and demodulates the downlink control channel by using the first demodulation reference signal. Optionally, the terminal device may also acquire third indication information.

S1103: The terminal device acquires the downlink data channel and the second demodulation reference signal based on the demodulated downlink control channel, and demodulates the downlink data channel sent by the network device according to the first demodulation reference signal and the second demodulation reference signal.

Based on the same concept, referring to FIG. 12 , an embodiment of the present application provides an apparatus 1200 for transmitting downlink signals. The apparatus 1200 includes a processing module 1201 and a communication module 1202 . The communication apparatus 1200 may be a network device, or a device applied to a network device, capable of supporting the network device to perform a method for transmitting downlink signals, or the communication device 1200 may be a terminal device, or a device applied to a terminal device, capable of An apparatus for supporting a terminal device to perform a downlink signal transmission method.

The communication module may also be referred to as a transceiver module, a transceiver, a transceiver, a transceiver, or the like. The processing module may also be referred to as a processor, a processing board, a processing unit, a processing device, and the like. Optionally, the device used for realizing the receiving function in the communication module may be regarded as a receiving unit. It should be understood that the communication module is used to perform the sending and receiving operations on the network device side or the terminal device side in the above method embodiments, and the communication The device used to realize the sending function in the module is regarded as a sending unit, that is, the communication module includes a receiving unit and a sending unit. When the apparatus 1200 is applied to a network device, the receiving unit included in the communication module 1202 is used to perform receiving operations on the network device side, such as receiving an uplink signal (uplink control channel/uplink data channel) from the terminal device; the communication module 1202 includes The sending unit is used to perform sending operations on the network device side, such as sending downlink signals to the terminal device. When the apparatus 1200 is applied to a terminal device, the receiving unit included in the communication module 1202 thereof is used to perform a receiving operation on the side of the terminal device, such as receiving a downlink signal from a network device. The sending unit included in the communication module 1202 thereof is used to perform a sending operation on the terminal device side, such as sending an uplink signal to a network device. In addition, it should be noted that, if the device is implemented by a chip/chip circuit, the communication module may be an input-output circuit and/or a communication interface, and perform input operations (corresponding to the aforementioned receiving operations) and output operations (corresponding to the aforementioned sending operations); The processing module is an integrated processor or microprocessor or integrated circuit.

The following will describe in detail an implementation manner in which the apparatus 1200 is applied to a network device. The apparatus 1200 includes:

A processing module 1201, configured to generate a downlink control channel, a first demodulation reference signal, and a downlink data channel, where the first demodulation reference signal is associated with the downlink control channel, and the downlink control channel is used to schedule the downlink data The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel.

A communication module 1202, configured to send the downlink control channel and the first demodulation reference signal to a terminal device.

The communication module 1202 is further configured to send the downlink data channel to the terminal device.

In the embodiment of the present application, by setting the demodulation reference signal associated with the downlink control channel, it can be used to demodulate the downlink data channel, implement multiplexing of the demodulation reference signal, and reduce the consumption of transmission resources and signaling overhead.

In an optional implementation manner, the communication module 1202 is further configured to send first indication information to the terminal device, where the first indication information is used to indicate one or more of the following: the downlink The control channel and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode; the first demodulation reference signal and the The downlink data channel adopts the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel adopt the same transmission mode.

In this embodiment of the present application, by setting the downlink data channel, the downlink control channel that schedules it, and the demodulation reference signal associated with the downlink control channel in the same transmission mode, the demodulation reference signal associated with the downlink control channel can be used to demodulate downlink data. channel to implement multiplexing of demodulation reference signals. The network device notifies the terminal device through the first indication information without delivering the demodulation reference signal associated with the downlink control channel, which can reduce the consumption of transmission resources and reduce signaling overhead.

One or more of the following conditions are met: the downlink control channel and the downlink data channel use the same transmission mode; the second demodulation reference signal associated with the downlink control channel and the downlink data channel use the same transmission mode ; the first demodulation reference signal and the downlink data channel use the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode. By setting the transmission mode of the downlink data channel, the downlink control channel that schedules it, and the demodulation reference signal associated with the downlink control channel to be the same, the demodulation reference signal associated with the downlink control channel can be used to demodulate the downlink data channel, and the demodulation reference signal can be realized. multiplexing of signals.

In this application, the network device notifies the terminal device through the first indication information that the downlink data channel is in the same transmission mode as the downlink control channel that schedules it and the demodulation reference signal associated with the downlink control channel, and the multiplexing of the demodulation reference signal is implemented. The downlink data channel can be demodulated according to the demodulation reference signal associated with the downlink control channel. There is no need for the network device to issue the demodulation reference signal associated with the downlink control channel, which can reduce the consumption of transmission resources and reduce the signaling overhead.

In an optional implementation manner, the communication module 1202 is further configured to send the second demodulation reference signal associated with the downlink data channel to the terminal device. In this way, the terminal device can combine the first demodulation reference signal and the second demodulation reference signal to demodulate the downlink data channel, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the communication module 1202 is further configured to send second indication information to the terminal device, where the second indication information is used to indicate the time occupied by the second demodulation reference signal domain resource location and/or frequency domain resource location.

In an optional implementation manner, the communication module 1202 is further configured to send second indication information to the terminal device, where the second indication information includes information used to indicate the first time domain offset; The first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel (for example, the time domain resource start of the downlink control channel) position or the end position of the time domain resource of the downlink control channel), or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the first demodulation the distance between the time domain resource positions of the reference signal, or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource start of the downlink data channel The distance between locations (or, where the temporal resource ends). In this way, the time domain resource location where the second demodulation reference signal is located can be indirectly or implicitly indicated to the terminal device, and the terminal device is based on the combination of the time domain resource location where the first demodulation reference signal/downlink control channel is located. The position of the second demodulation reference signal can be known by the first time-domain offset.

In an optional implementation manner, the communication module 1202 is further configured to send third indication information to the terminal device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, the one or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference signal associated with the downlink data channel. In this way, the terminal device can demodulate some or all of the downlink data channels sent by the network device according to the third indication information and the first demodulation reference signal, and implement multiplexing of the demodulation reference signals, which can reduce downlink data channels. The transmission resource occupied by the associated second demodulation reference signal reduces signaling overhead.

The following describes in detail an embodiment in which the apparatus 1200 is applied to a terminal device. The apparatus 1200 includes:

A communication module 1202, configured to receive a downlink control channel and a first demodulation reference signal from a network device, where the first demodulation reference signal is associated with the downlink control channel, and the downlink control channel is used to schedule a downlink data channel, The first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel.

The processing module 1201 is configured to demodulate the downlink control channel according to the first demodulation reference signal.

The communication module 1202 is further configured to receive the downlink data channel from the network device.

The processing module 1201 is further configured to demodulate the downlink data channel according to the first demodulation reference signal.

In an optional implementation manner, the communication module 1202 is specifically configured to receive a downlink control channel from a network device, and receive (acquire) the downlink data channel from the network device based on the downlink control channel; The processing module 1201 is specifically configured to demodulate the downlink control channel and the downlink data channel respectively according to the first demodulation reference signal; or, the communication module 1202 may first receive the downlink control channel from the network device, and the The processing module 1201 first demodulates the downlink control channel according to the first demodulation reference signal; the communication module 1202 then receives (obtains) the downlink data channel from the network device based on the control information in the downlink control channel, The processing module 1201 further demodulates the downlink data channel according to the first demodulation reference signal.

In an optional implementation manner, one or more of the following conditions are satisfied: the downlink control channel and the downlink data channel use the same transmission mode; the first link associated with the downlink control channel and the downlink data channel The second demodulation reference signal adopts the same transmission mode; the first demodulation reference signal and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the first demodulation reference signal and the downlink data channel The modulation reference signal adopts the same transmission method. By setting the downlink data channel, the downlink control channel that schedules it, and the demodulation reference signal associated with the downlink control channel in the same transmission mode, the demodulation reference signal associated with the downlink control channel can be used to demodulate the downlink data channel, and the demodulation reference signal is realized. multiplexing of signals.

In an optional implementation manner, the communication module 1202 is further configured to receive first indication information from the network device, where the first indication information is used to indicate one or more of the following: the The downlink control channel and the downlink data channel adopt the same transmission mode; the second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode; the first demodulation reference signal and The downlink data channel adopts the same transmission mode; the first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel adopt the same transmission mode.

In an optional implementation manner, the communication module 1202 is further configured to receive a second demodulation reference signal associated with the downlink data channel from the network device; the processing module 1201 is further configured to The first demodulation reference signal and the second demodulation reference signal demodulate the downlink data channel. In this way, the terminal device can combine the first demodulation reference signal and the second demodulation reference signal to demodulate the downlink data channel, which can improve the detection performance of the downlink data channel.

In an optional implementation manner, the communication module 1202 is further configured to send second indication information to the terminal device, where the second indication information is further used to indicate the space occupied by the second demodulation reference signal Time domain resource location and/or frequency domain resource location.

In an optional implementation manner, the communication module 1202 is further configured to send second indication information to the terminal device,

The second indication information includes information used to indicate a first time domain offset; wherein, the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the The distance between the time domain resource positions of the downlink control channel (for example: the start position of the time domain resource of the downlink control channel or the end position of the time domain resource of the downlink control channel), or the first time domain offset is used to represent the distance between the time domain resource position of the second demodulation reference signal and the time domain resource position of the first demodulation reference signal, or the first time domain offset is used to characterize the second demodulation The distance between the time domain resource position of the reference signal and the time domain resource start position (or, the time domain resource end position) of the downlink data channel is adjusted. In this way, the time domain resource location where the second demodulation reference signal is located can be indirectly or implicitly indicated to the terminal device, and the terminal device is based on the combination of the time domain resource location where the first demodulation reference signal/downlink control channel is located. The position of the second demodulation reference signal can be known by the first time-domain offset.

In an optional implementation manner, the communication module 1202 is further configured to receive third indication information from the network device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, One or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference A signal is associated with the downstream data channel. In this way, the terminal device can demodulate part or all of the downlink data channel sent by the network device according to the third indication information and the first demodulation reference signal, and implement multiplexing of the demodulation reference signal, which can reduce downlink data channels The transmission resource occupied by the associated second demodulation reference signal reduces signaling overhead.

In an optional implementation manner, the processing module 1201 is further configured to demodulate the downlink data channel sent by the network device according to the first demodulation reference signal and the third indication information part or all of it.

In an optional implementation manner, the processing module 1201 is specifically configured to: determine the downlink data channel according to the third indication information and the downlink control channel demodulated by the first demodulation reference signal The transmission mode of the first demodulation reference signal and the transmission mode of the first demodulation reference signal; wherein, the downlink data channel and the second demodulation reference signal adopt the same transmission mode, and the first demodulation reference signal and the downlink The control channel adopts the same transmission mode, and the transmission mode includes precoding, precoding granularity, and transmission resources. If the transmission mode of the downlink data channel is the same as the transmission mode of the first demodulation reference signal, demodulate all the downlink data channels according to the first demodulation reference signal; if the downlink data channel The transmission mode of the channel is partially the same as the transmission mode of the first demodulation reference signal, and then part of the downlink data channel is demodulated according to the first demodulation reference signal.

In an optional implementation manner, the processing module 1201 is specifically configured to: determine the precoding granularity of the downlink data channel and the precoding of the first demodulation reference signal according to the third indication information The granularity is the same. All of the downlink data channels sent by the network device are demodulated according to the first demodulation reference signal; or, the terminal device demodulates according to the first demodulation reference signal, which is sent by the network device and is related to The first demodulation reference signal occupies a downlink data channel of the same frequency domain resource.

In an optional implementation manner, the processing module 1201 is specifically configured to: determine, according to the third indication information, that the precoding granularity of the downlink data channel is different from that of the first demodulation reference signal, and The precoding resource block group of the downlink data channel partially overlaps the precoding resource block group of the first demodulation reference signal. The downlink data channel in the precoding resource block group of the overlapping part is demodulated according to the first demodulation reference signal in the precoding resource block group of the overlapping part.

Based on the same concept, as shown in FIG. 13 , an embodiment of the present application provides a communication apparatus 1300 , and the communication apparatus 1300 may be a chip or a chip system. Optionally, in this embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The communication device 1300 may include at least one processor 1310 coupled to a memory, which may optionally be located within the device or external to the device. For example, the communication device 1300 may also include at least one memory 1320 . The memory 1320 stores necessary computer programs, configuration information, computer programs or instructions and/or data to implement any of the above embodiments; the processor 1310 may execute the computer programs stored in the memory 1320 to complete the methods in any of the above embodiments.

The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1310 may cooperate with the memory 1320. The specific connection medium between the transceiver 1330, the processor 1310, and the memory 1320 is not limited in the embodiments of the present application.

The communication apparatus 1300 may further include a transceiver 1330, and the communication apparatus 1300 may exchange information with other devices through the transceiver 1330. The transceiver 1330 may be a circuit, a bus, a transceiver, or any other device that can be used for information exchange, or referred to as a signal transceiving unit. As shown in FIG. 13 , the transceiver 1330 includes a transmitter 1331 , a receiver 1332 and an antenna 1333 . In addition, when the communication device 1300 is a chip-type device or circuit, the transceiver in the device 1300 can also be an input-output circuit and/or a communication interface, which can input data (or receive data) and output data (or The processor is an integrated processor or a microprocessor or an integrated circuit, and the processor can determine the output data according to the input data.

In a possible implementation manner, the communication apparatus 1300 may be applied to a network device, and the specific communication apparatus 1300 may be a network device, or a device capable of supporting a network device and implementing the functions of the network device in any of the above-mentioned embodiments. device. The memory 1320 holds the necessary computer programs, computer programs or instructions and/or data to implement the functions of the network device in any of the above-described embodiments. The processor 1310 can execute the computer program stored in the memory 1320 to complete the method executed by the network device in any of the foregoing embodiments. Applied to network equipment, the transmitter 1331 in the communication apparatus 1300 can be used to send transmission control configuration information to the terminal equipment through the antenna 1333 , and the receiver 1332 can be used to receive the transmission information sent by the terminal equipment through the antenna 1333 .

In another possible implementation manner, the communication apparatus 1300 may be applied to a terminal device, and the specific communication apparatus 1300 may be a terminal device or a terminal device capable of supporting the functions of the terminal device in any of the above-mentioned embodiments. installation. The memory 1320 stores necessary computer programs, computer programs or instructions and/or data to implement the functions of the terminal device in any of the above embodiments. The processor 1310 can execute the computer program stored in the memory 1320 to complete the method executed by the terminal device in any of the foregoing embodiments. Applied to terminal equipment, the receiver 1332 in the communication apparatus 1300 can be used to receive transmission control configuration information sent by the network equipment through the antenna 1333 , and the transmitter 1331 can be used to send transmission information to the network equipment through the antenna 1333 .

Because the communication apparatus 1300 provided in this embodiment can be applied to a network device to complete the method executed by the network device, or applied to a terminal device to complete the method executed by the terminal device. Therefore, the technical effects that can be obtained can be referred to the above method embodiments, which will not be repeated here.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or The methods, steps and logic block diagrams disclosed in the embodiments of this application are executed. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

In this embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or may also be a volatile memory (volatile memory), for example Random-access memory (RAM). The memory may also be, but is not limited to, any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory in this embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, for storing computer programs, computer programs or instructions and/or data.

Based on the above embodiments, referring to FIG. 14 , an embodiment of the present application further provides another communication apparatus 1400, including: an interface circuit 1410 and a processor 1420; the interface circuit 1410 is configured to receive code instructions and transmit them to the processor; the processor 1420 , which is used to run code instructions to execute the method executed by the network device or the method executed by the terminal device in any of the foregoing embodiments.

Because the communication apparatus 1400 provided in this embodiment can be applied to a network device to execute the method executed by the foregoing network device, or applied to a terminal device to execute the method executed by the terminal device. Therefore, the technical effects that can be obtained can be referred to the above method embodiments, which will not be repeated here.

Based on the above embodiments, embodiments of the present application further provide a communication system, where the communication system includes at least one communication device applied to a network device and at least one communication device applied to a terminal device. For the technical effects that can be obtained, reference may be made to the foregoing method embodiments, which will not be repeated here.

Based on the above embodiments, the embodiments of the present application further provide a computer-readable storage medium, where computer programs or instructions are stored in the computer-readable storage medium, and when the instructions are executed, the method for executing the network device in any of the foregoing embodiments is performed. The method implemented or executed by the terminal device is implemented. The computer-readable storage medium may include: a USB flash drive, a removable hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and other media that can store program codes.

In order to realize the functions of the communication apparatuses in the above-mentioned FIG. 12 to FIG. 14 , an embodiment of the present application further provides a chip, including a processor, for supporting the communication apparatus to implement the functions involved in the network equipment or terminal equipment in the foregoing method embodiments. In a possible design, the chip is connected to a memory or the chip includes a memory for storing computer programs or instructions and data necessary for the communication device.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowcharts and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams, can be implemented by computer programs or instructions. These computer programs or instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer programs or instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the The instruction means implement the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer programs or instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operational steps are performed on the computer or other programmable device to produce a computer-implemented process for execution on the computer or other programmable device The instructions provide steps for implementing the functions specified in one or more of the flowcharts and/or one or more blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A method for transmitting downlink signals, comprising:

The network device sends a downlink control channel and a first demodulation reference signal to the terminal device, the first demodulation reference signal is associated with the downlink control channel, the downlink control channel is used to schedule a downlink data channel, and the first demodulation reference signal is used to schedule a downlink data channel. A modulation reference signal is used to demodulate the downlink control channel and the downlink data channel;

The network device sends the downlink data channel to the terminal device.
The method of claim 1, wherein one or more of the following conditions are satisfied:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The method of claim 1, wherein the method further comprises:

The network device sends first indication information to the terminal device, where the first indication information is used to indicate one or more of the following:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The method according to claim 2 or 3, wherein the same transmission mode includes the same transmission resource, the same precoding and the same precoding granularity.
The method according to any one of claims 2-4, wherein the method further comprises:

The network device sends the second demodulation reference signal associated with the downlink data channel to the terminal device.
The method of claim 5, wherein the method further comprises:

The network device sends second indication information to the terminal device, where the second indication information is used to indicate a time domain resource location and/or a frequency domain resource location of the second demodulation reference signal.
The method of claim 5, wherein the method further comprises:

The network device sends second indication information to the terminal device, where the second indication information includes information used to indicate a first time domain offset; wherein the first time domain offset is used to characterize the the distance between the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel, or the first time domain offset is used to characterize the second demodulation reference signal. The distance between the time domain resource position and the time domain resource position of the first demodulation reference signal, or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the time domain resource position. The distance between the start positions of the time domain resources of the downlink data channel.
The method of claim 1, wherein the method further comprises:

The network device sends third indication information to the terminal device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, the precoding granularity of the first demodulation reference signal, the downlink granularity One or more of the precoding granularity of the data channel and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference signal is associated with the downlink data channel.
The method of claim 8, wherein the precoding granularity of the downlink control channel is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the downlink control channel is related to the second The precoding granularity of the demodulation reference signal is related; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the second demodulation reference signal.
A method for transmitting downlink signals, comprising:

The terminal device receives a downlink control channel and a first demodulation reference signal from a network device, the first demodulation reference signal is associated with the downlink control channel, the downlink control channel is used to schedule a downlink data channel, and the first demodulation reference signal is used to schedule a downlink data channel. A demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel;

The terminal device demodulates the downlink control channel according to the first demodulation reference signal;

The terminal device receives the downlink data channel from the network device, and demodulates the downlink data channel according to the first demodulation reference signal.
The method of claim 10, wherein one or more of the following conditions are satisfied:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The method of claim 10, wherein the method further comprises:

The terminal device receives first indication information from the network device, where the first indication information is used to indicate one or more of the following:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The method according to claim 11 or 12, wherein the same transmission mode includes the same transmission resource, the same precoding and the same precoding granularity.
The method according to any one of claims 11-13, wherein the method further comprises:

receiving, by the terminal device, a second demodulation reference signal associated with the downlink data channel from the network device;

The terminal device demodulates the downlink data channel according to the first demodulation reference signal and the second demodulation reference signal.
The method of claim 14, wherein the method further comprises:

Receive second indication information from the network device, where the second indication information is used to indicate a time domain resource location and/or a frequency domain resource location occupied by the second demodulation reference signal.
The method of claim 14, wherein the method further comprises:

receiving second indication information from the network device, where the second indication information includes information used to indicate a first time domain offset; wherein the first time domain offset is used to characterize the second the distance between the time domain resource position of the demodulation reference signal and the time domain resource position of the downlink control channel, or the first time domain offset is used to characterize the time domain resource of the second demodulation reference signal the distance between the position and the time domain resource position of the first demodulation reference signal, or the first time domain offset is used to characterize the time domain resource position of the second demodulation reference signal and the downlink The distance between the start positions of the time domain resources of the data channel.
The method of claim 10, wherein the method further comprises:

The terminal device receives third indication information from the network device, where the third indication information is used to indicate the precoding granularity of the downlink control channel, the precoding granularity of the first demodulation reference signal, the One or more of the precoding granularity of the downlink data channel and the precoding granularity of the second demodulation reference signal; wherein the second demodulation reference signal is associated with the downlink data channel.
The method of claim 17, wherein the precoding granularity of the downlink control channel is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the downlink control channel is related to the second The precoding granularity of the demodulation reference signal is related; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the second demodulation reference signal.
A device for transmitting downlink signals, characterized in that it is applied to network equipment, the device comprising:

a processing module, configured to generate a downlink control channel, a first demodulation reference signal and a downlink data channel, the first demodulation reference signal is associated with the downlink control channel, and the downlink control channel is used to schedule the downlink data channel , the first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel;

a communication module, configured to send the downlink control channel and the first demodulation reference signal to a terminal device;

The communication module is further configured to send the downlink data channel to the terminal device.
The device of claim 19, wherein one or more of the following conditions are satisfied:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The apparatus of claim 19, wherein the communication module is further configured to send first indication information to the terminal device, where the first indication information is used to indicate one or more of the following:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The apparatus according to claim 20 or 21, wherein the same transmission mode includes the same transmission resource, the same precoding and the same precoding granularity.
The apparatus according to any one of claims 20-22, wherein the communication module is further configured to send the second demodulation reference signal associated with the downlink data channel to the terminal device.
The apparatus of claim 23, wherein the communication module is further configured to send second indication information to the terminal device, where the second indication information is used to indicate that the second demodulation reference signal is in The time domain resource location and/or the frequency domain resource location occupied in the transmission resource.
The apparatus according to claim 23, wherein the communication module is further configured to send second indication information to the terminal device, wherein the second indication information includes an indicator used to indicate the first time domain offset. information; wherein the first time domain offset is used to represent the distance between the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel, or the first time domain offset The time domain offset is used to characterize the distance between the time domain resource position of the second demodulation reference signal and the time domain resource position of the first demodulation reference signal, or the first time domain offset It is used to characterize the distance between the time domain resource position of the second demodulation reference signal and the start position of the time domain resource of the downlink data channel.
The apparatus of claim 19, wherein the communication module is further configured to send third indication information to the terminal device, where the third indication information is used to indicate the precoding granularity of the downlink control channel , one or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein the second demodulation A reference signal is associated with the downlink data channel.
The apparatus of claim 26, wherein the precoding granularity of the downlink control channel is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the downlink control channel is related to the second The precoding granularity of the demodulation reference signal is related; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the second demodulation reference signal.
A device for transmitting downlink signals, characterized in that it is applied to terminal equipment, the device comprising:

A communication module, configured to receive a downlink control channel and a first demodulation reference signal from a network device, the first demodulation reference signal is associated with the downlink control channel, and the downlink control channel is used to schedule a downlink data channel, so the first demodulation reference signal is used to demodulate the downlink control channel and the downlink data channel;

a processing module, configured to demodulate the downlink control channel according to the first demodulation reference signal;

the communication module, further configured to receive the downlink data channel from the network device;

The processing module is further configured to demodulate the downlink data channel according to the first demodulation reference signal.
The device of claim 28, wherein one or more of the following conditions are satisfied:

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The apparatus of claim 28, wherein the communication module is further configured to receive first indication information from the network device, where the first indication information is used to indicate one or more of the following :

The downlink control channel and the downlink data channel use the same transmission mode;

The second demodulation reference signal associated with the downlink control channel and the downlink data channel adopts the same transmission mode;

the first demodulation reference signal and the downlink data channel adopt the same transmission mode;

The first demodulation reference signal and the second demodulation reference signal associated with the downlink data channel use the same transmission mode.
The apparatus according to claim 29 or 30, wherein the same transmission mode includes the same transmission resource, the same precoding and the same precoding granularity.
The device of any one of claims 29-31, wherein,

The communication module is further configured to receive a second demodulation reference signal associated with the downlink data channel from the network device;

The processing module is further configured to demodulate the downlink data channel according to the first demodulation reference signal and the second demodulation reference signal.
The apparatus of claim 32, wherein the communication module is further configured to receive second indication information from the network device, where the second indication information is further used to indicate the second demodulation reference The time domain resource position and/or the frequency domain resource position occupied by the signal in the transmission resource.
The apparatus of claim 32, wherein the communication module is further configured to receive second indication information from the network device, the second indication information comprising a first time domain offset information; wherein the first time domain offset is used to represent the distance between the time domain resource position of the second demodulation reference signal and the time domain resource position of the downlink control channel, or the first time domain offset A time domain offset is used to represent the distance between the time domain resource position of the second demodulation reference signal and the time domain resource position of the first demodulation reference signal, or the first time domain offset The quantity is used to characterize the distance between the time domain resource position of the second demodulation reference signal and the time domain resource starting position of the downlink data channel.
The apparatus of claim 28, wherein the communication module is further configured to receive third indication information from the network device, where the third indication information is used to indicate precoding of the downlink control channel Granularity, one or more of the precoding granularity of the first demodulation reference signal, the precoding granularity of the downlink data channel, and the precoding granularity of the second demodulation reference signal; wherein, the second demodulation reference signal A tuning reference signal is associated with the downlink data channel.
The apparatus of claim 35, wherein the precoding granularity of the downlink control channel is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the downlink control channel is related to the second The precoding granularity of the demodulation reference signal is related; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the downlink data channel; or, the precoding granularity of the first demodulation reference signal is related to the precoding granularity of the second demodulation reference signal.
A communication device, characterized in that it includes:

a processor coupled to a memory, the memory for storing computer programs or instructions, the processor for executing the computer programs or instructions to implement the method of any one of claims 1-9 or The method of any of claims 10-18.
A communication device, characterized by comprising: a processor and an interface circuit, the interface circuit is used for communicating with other devices, and the processor is used for executing the method of any one of claims 1-9 or claim 10 - The method of any one of 18.
A computer-readable storage medium, characterized in that a computer program or instruction is stored on the computer-readable storage medium, and when the instruction is executed on a computer, the method of any one of claims 1-9 is implemented Or the method of any one of claims 10-18.