WO2020164461A1

WO2020164461A1 - Downlink transmission method and device thereof

Info

Publication number: WO2020164461A1
Application number: PCT/CN2020/074671
Authority: WO
Inventors: 缪德山; 孙韶辉; 康绍莉
Original assignee: 电信科学技术研究院有限公司
Priority date: 2019-02-14
Filing date: 2020-02-10
Publication date: 2020-08-20
Also published as: CN111565458A; CN111565458B

Abstract

Disclosed by the present application are a downlink transmission method and a device thereof. In the present application, a terminal receives a downlink reference signal and obtains frequency domain resource allocation information of a downlink channel according to the sequence and/or frequency domain location of the downlink reference signal; or the terminal receives information transmitted on a dedicated channel and obtains the frequency domain resource allocation information of the downlink channel according to said information transmitted on the dedicated channel, wherein the frequency domain resource allocation information comprises a bandwidth and/or frequency domain resource location, and the downlink channel comprises a downlink data channel and/or a downlink control channel. The terminal thus obtains information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

Description

Downlink transmission method and device

Cross references to related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on February 14, 2019, the application number is 201910115173.0, and the application name is "a downlink transmission method and device", the entire content of which is incorporated into this application by reference in.

Technical field

This application relates to the field of wireless communication technology, and in particular to a downlink transmission method and device.

Background technique

In satellite communications, due to the limitation of Peak to Average Power Ratio (PAPR), the downlink transmission uses Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing, DFT- S-OFDM) waveform, and only one DFT transform is used in the total transmission bandwidth of multiple users. Considering that multiple users share time-frequency resources for downlink transmission, the physical downlink shared channel (PDSCH) and the physical downlink control channel (PDCCH) of multiple users will be sent at the same time. Among them, PDSCH can be used to transmit user data and is called a control channel, and PDCCH can be used to transmit control information and is called a control channel.

When transmitting signals based on DFT-S-OFDM, the receiving end needs to perform Inverse Discrete Fourier Transform (IDFT) first, and then perform data detection. When performing IDFT conversion, the number of IDFT points is the number of subcarriers actually occupied, which requires the terminal to know the bandwidth occupied by the transmitted signal (that is, the number of subcarriers) in advance. Therefore, how to indicate the bandwidth of the sender to the receiver is a problem that needs to be solved at present.

Summary of the invention

The present application provides a downlink transmission method and device for indicating frequency domain resource allocation information for downlink transmission to a terminal during downlink transmission.

In a first aspect, a downlink transmission method is provided, including: a terminal receives a downlink reference signal, and obtains frequency domain resource allocation information of a downlink channel according to a sequence and/or frequency domain position of the downlink reference signal, or the terminal receives Information transmitted on the dedicated channel, and the frequency domain resource allocation information of the downlink channel is obtained according to the information transmitted on the dedicated channel; wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel Including downlink data channel and/or downlink control channel. The terminal obtains the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

In a possible implementation, the terminal obtaining the frequency domain resource allocation information of the downlink channel according to the frequency domain position of the downlink reference signal includes: the subcarrier position occupied by the terminal according to the downlink reference signal, Obtain frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal.

Further, the position of the subcarrier occupied by the downlink reference signal includes at least one of the following: the number of subcarrier intervals between the subcarriers occupied by the downlink reference signal, and the position of the subcarrier occupied by the downlink reference signal Offset.

In a possible implementation manner, the terminal obtaining the frequency domain resource allocation information of the downlink channel according to the sequence of the downlink reference signal includes: the terminal obtains according to the initial generation function of the sequence of the downlink reference signal Frequency domain resource allocation information of the downlink channel, where the initial generation function of the sequence of the downlink reference signal is calculated according to the index of the frequency domain resource allocation information of the downlink channel; or, the terminal is calculated according to the downlink reference signal index A bit at a designated position in the sequence is used to obtain frequency domain resource allocation information of the downlink channel, where the bit at a designated position in the sequence of the downlink reference signal is used to indicate an index of the frequency domain resource allocation information of the downlink channel.

In a possible implementation, the terminal obtaining the frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel includes: the terminal according to the signal sequence transmitted on the dedicated channel or the dedicated channel The modulation symbol of the channel obtains the frequency domain resource allocation information of the downlink channel.

In a possible implementation manner, among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed and then discrete Fourier transform is performed Or, in the frequency domain resources of the downlink channel, among the symbols occupied by the control channel, the control channel and the data channel are time-domain multiplexed, and the symbols occupied by the data channel In this method, data signals of multiple users are time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform for transmission.

In a possible implementation manner, the terminal obtaining the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel includes: the terminal according to the bandwidth position of the downlink channel, The information received on the downlink channel within the bandwidth is transformed from frequency domain to time domain to obtain the time domain samples of the downlink channel; the terminal performs blind detection at a specified position in the time domain samples to obtain all The control information transmitted on the control channel, where the control information includes the resource position of the data channel before the time domain to frequency domain conversion; the terminal according to the resource position of the data channel before the time domain to frequency domain conversion, Obtain the information transmitted on the data channel from the time-domain samples of the downlink channel.

In a second aspect, a downlink transmission method is provided, including:

The network device generates a downlink reference signal, the sequence and/or frequency domain position of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel, and the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position. The channel includes a downlink data channel and/or a downlink control channel; the network device sends the downlink reference signal.

In a possible implementation manner, the frequency domain position of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel, including: a subcarrier position occupied by the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; Wherein, the position of the subcarrier occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel.

In a possible implementation, the sequence of the downlink reference signal indicates the frequency domain resource allocation information of the downlink channel, including: the initial generation function of the sequence of the downlink reference signal indicates the frequency domain resource allocation information of the downlink channel, where The initial generation function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the initial generation function of the sequence of the downlink reference signal is calculated according to the index of the frequency domain resource allocation information of the downlink channel Or, the bit at the specified position in the sequence of the downlink reference signal indicates the index of the frequency domain resource allocation information of the downlink channel.

In a possible implementation manner, the method further includes: among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the network device first performs time-domain multiplexing on the control channel and the data channel. Used for transmission after performing discrete Fourier transform; or, in the frequency domain resources of the downlink channel, time domain multiplexing the control channel and the data channel in the symbols occupied by the control channel, The data signals of multiple users are time-domain multiplexed in the symbols occupied by the data channel, and the time-domain multiplexed signal is subjected to discrete Fourier transform for transmission.

Further, in the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the network device first performs time domain multiplexing on the control channel and the data channel, and then performs discrete Fourier transform The transmission includes: the network device performs time-domain continuous mapping of the control information that needs to be transmitted on the control channel according to the symbols occupied by the control channel, and the signal corresponding to the control channel obtained after continuous mapping in the time domain For unoccupied positions of samples, time-domain mapping is performed on the information that needs to be transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

The network device performs discrete Fourier transform on the time domain signal samples of the control channel and the data channel to obtain the frequency domain signal samples of the control signal and the data channel;

The network device performs frequency domain mapping on the frequency domain signal samples of the control channel and the data channel according to the bandwidth of the control channel and the data channel.

Further, after obtaining the time-domain signal samples of the control channel and the data channel, the method further includes: if the bandwidth of the data channel is less than a specified bandwidth, the network device is configured according to the bandwidth of the data channel and the Specify the bandwidth, and fill the time domain samples of the redundant signal in the time domain signal samples of the control channel and the data channel. The network device performing discrete Fourier transform on the time-domain signal samples of the control channel and the data channel includes: the network device transforms the time-domain signal samples of the control channel and the data channel and The time-domain samples of the redundant signal are uniformly subjected to discrete Fourier transform.

In a third aspect, a downlink transmission method is provided, including: a network device generates information for transmission on a dedicated channel, the information is used to indicate frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information Including bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; the network device sends the information on the dedicated channel.

In a possible implementation, the signal sequence transmitted on the dedicated channel or the modulation symbol of the dedicated channel indicates the frequency domain resource allocation information of the downlink channel; wherein, the signal sequence and the modulation symbol of the downlink channel The frequency domain resource allocation information corresponds, and the modulation symbol of the dedicated channel corresponds to the frequency domain resource allocation information of the downlink channel.

Further, in the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the network device performs time domain multiplexing on the control channel and the data channel first, and then performs discrete Fourier transform. Perform transmission, including:

According to the symbols occupied by the control channel, the network device performs time-domain continuous mapping of the control information that needs to be transmitted on the control channel, and the signal samples corresponding to the control channel obtained after continuous mapping in the time domain are unoccupied Position, time-domain mapping the information that needs to be transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

In a fourth aspect, a downlink transmission method is provided, including: a terminal obtains frequency domain resource allocation information of a downlink channel; the terminal obtains information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel; wherein , The frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; symbols occupied by the control channel in the frequency domain resources of the downlink channel Wherein, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform before transmission; or in the frequency domain resources of the downlink channel, among the symbols occupied by the control channel, The control channel and the data channel are time-domain multiplexed, among the symbols occupied by the data channel, the data signals of multiple users are time-domain multiplexed, and then the time-domain multiplexed signal is subjected to discrete Fourier Transmit after leaf transformation.

In a fifth aspect, a terminal is provided, including: a receiving module, configured to receive a downlink reference signal; and a processing module, configured to obtain frequency domain resource allocation information of a downlink channel according to a sequence and/or frequency domain position of the downlink reference signal; Wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; and, according to the frequency domain resource allocation information of the downlink channel, all the resources are obtained. The information transmitted on the downlink channel.

In a possible implementation manner, the processing module is specifically configured to:

According to the position of the subcarrier occupied by the downlink reference signal, the frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal is obtained.

In a possible implementation, the position of the subcarrier occupied by the downlink reference signal includes at least one of the following:

The number of subcarrier intervals between subcarriers occupied by the downlink reference signal;

The position offset of the subcarrier occupied by the downlink reference signal.

The frequency domain resource allocation information of the downlink channel is obtained according to the initial generation function of the downlink reference signal sequence; wherein the initial generation function of the downlink reference signal sequence is calculated according to the index of the frequency domain resource allocation information of the downlink channel Get; or

The frequency domain resource allocation information of the downlink channel is obtained according to the bits at the specified position in the sequence of the downlink reference signal; wherein the bits at the specified position in the sequence of the downlink reference signal are used to indicate the frequency domain resource allocation information of the downlink channel index.

In a possible implementation manner, among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed and then discrete Fourier transform is performed Transfer later; or

In the frequency domain resources of the downlink channel, among the symbols occupied by the control channel, the control channel and the data channel are time-domain multiplexed, and among the symbols occupied by the data channel, multiple users’ The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.

Transform the information received on the downlink channel in the bandwidth from the frequency domain to the time domain according to the bandwidth position of the downlink channel to obtain the time domain samples of the downlink channel;

Perform blind detection at a specified position in the time domain sample to obtain control information transmitted on the control channel, where the control information includes the resource position of the data channel before time domain to frequency domain conversion;

According to the resource position of the data channel before the time domain to frequency domain conversion, the information transmitted on the data channel is obtained from the time domain samples of the downlink channel.

In a sixth aspect, a terminal is provided, including: a receiving module, configured to receive information transmitted on a dedicated channel; a processing module, configured to obtain frequency domain resource allocation information of a downlink channel according to the information transmitted on the dedicated channel; wherein, The frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; and, according to the frequency domain resource allocation information of the downlink channel, the downlink channel is obtained. Information transmitted on the channel.

According to the signal sequence transmitted on the dedicated channel or the modulation symbol of the dedicated channel, the frequency domain resource allocation information of the downlink channel is obtained.

In a seventh aspect, a network device is provided, including: a processing module configured to generate a downlink reference signal, the sequence and/or frequency domain position of the downlink reference signal indicating frequency domain resource allocation information of a downlink channel, and the frequency domain resource The allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; a sending module is used to send the downlink reference signal.

In a possible implementation, the frequency domain position of the downlink reference signal indicating frequency domain resource allocation information of the downlink channel includes:

The position of the subcarrier occupied by the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; wherein the position of the subcarrier occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel.

In a possible implementation, the sequence of the downlink reference signal indicating frequency domain resource allocation information of the downlink channel includes:

The initial generation function of the sequence of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; wherein, the initial generation function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the downlink reference signal The initial generation function of the signal sequence is calculated according to the index of the frequency domain resource allocation information of the downlink channel; or

The bit at the specified position in the sequence of the downlink reference signal indicates the index of the frequency domain resource allocation information of the downlink channel.

In a possible implementation manner, the processing module is further configured to:

Among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform for transmission; or

In the frequency domain resources of the downlink channel, the control channel and the data channel are time-domain multiplexed among the symbols occupied by the control channel, and the symbols occupied by the data channel are used for multiple users. The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.

According to the symbols occupied by the control channel, the control information that needs to be transmitted on the control channel is continuously mapped in the time domain, and the unoccupied position of the signal sample corresponding to the control channel obtained after continuous mapping in the time domain will be required Time-domain mapping is performed on the information transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

Performing discrete Fourier transform on time domain signal samples of the control channel and the data channel to obtain frequency domain signal samples of the control signal and the data channel;

According to the bandwidth of the control channel and the data channel, the frequency domain signal samples of the control channel and the data channel are subjected to frequency domain mapping.

After obtaining the time-domain signal samples of the control channel and the data channel, if the bandwidth of the data channel is less than the designated bandwidth, then according to the bandwidth of the data channel and the designated bandwidth, the control channel and the designated bandwidth The time-domain signal samples of the data channel are filled with time-domain samples of the redundant signal;

The processor is specifically configured to: uniformly perform discrete Fourier transform on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.

In an eighth aspect, a network device is provided, including: a processing module, configured to generate information for sending on a dedicated channel, the information being used to indicate frequency domain resource allocation information of a downlink channel; wherein, the frequency domain resource The allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; a sending module is used to send the information on the dedicated channel.

After obtaining the time-domain signal samples of the control channel and the data channel, if the bandwidth of the data channel is less than the specified bandwidth, the network device will perform the processing in the data channel according to the bandwidth of the data channel and the specified bandwidth. Time-domain signal samples of the control channel and the data channel are filled with time-domain samples of the redundant signal;

The processing module is specifically configured to: uniformly perform discrete Fourier transform on the time-domain signal samples of the control channel and the data channel and the time-domain samples of the redundant signal.

In a ninth aspect, a terminal is provided, including: a first obtaining module, configured to obtain frequency domain resource allocation information of a downlink channel; and a second obtaining module, configured to obtain the frequency domain resource allocation information of the downlink channel; Information transmitted on a downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; the frequency domain resource of the downlink channel Among the symbols occupied by the control channel, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform before transmission; or in the frequency domain resources of the downlink channel, Among the symbols occupied by the control channel, the control channel and the data channel are time-domain multiplexed. Among the symbols occupied by the data channel, the data signals of multiple users are time-domain multiplexed, and then the time-domain multiplexing is performed. The used signal undergoes discrete Fourier transform and then transmits.

In a possible implementation manner, the second acquisition module is specifically configured to: according to the bandwidth position of the downlink channel, transform the information received on the downlink channel within the bandwidth from the frequency domain to the time domain to obtain The time-domain samples of the downlink channel; perform blind detection at a specified position in the time-domain samples to obtain control information transmitted on the control channel, the control information including the time-to-frequency range of the data channel The resource position before the domain transformation; according to the resource position of the data channel before the time domain to frequency domain transformation, the information transmitted on the data channel is obtained from the time domain samples of the downlink channel.

In a tenth aspect, a communication device is provided, including: a processor, a memory, and a transceiver; the processor is configured to read computer instructions in the memory and execute:

Receiving a downlink reference signal through the transceiver, and obtaining frequency domain resource allocation information of a downlink channel according to the sequence and/or frequency domain position of the downlink reference signal, or receiving information transmitted on a dedicated channel through the transceiver, The frequency domain resource allocation information of the downlink channel is obtained according to the information transmitted on the dedicated channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes a downlink data channel and/or Downlink control channel;

Obtain the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

In a possible implementation manner, the processor is specifically configured to:

In an eleventh aspect, a communication device is provided, including: a processor, a memory, and a transceiver; the processor is configured to read computer instructions in the memory and execute:

Generate a downlink reference signal, the sequence and/or frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of the downlink channel, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position, and the downlink channel includes Downlink data channel and/or downlink control channel;

Sending the downlink reference signal through the transceiver.

In a possible implementation manner, the processor is further configured to:

In a twelfth aspect, a communication device is provided, including: a processor, a memory, and a transceiver; the processor is configured to read computer instructions in the memory and execute:

Generate information for sending on a dedicated channel, the information is used to indicate frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes Downlink data channel and/or downlink control channel;

The information is sent on the dedicated channel through the transceiver.

In a possible implementation manner, the processor is further configured to:

In a thirteenth aspect, a communication device is provided, including: a processor, a memory, and a transceiver; the processor is configured to read computer instructions in the memory and execute:

Obtain frequency domain resource allocation information of the downlink channel; obtain information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel; wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location , The downlink channel includes a downlink data channel and/or a downlink control channel; among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed Discrete Fourier transform is performed before transmission; or in the frequency domain resources of the downlink channel, among the symbols occupied by the control channel, the control channel and the data channel are time-domain multiplexed, and Among the symbols occupied by the data channel, data signals of multiple users are time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform for transmission.

According to the bandwidth position of the downlink channel, the information received on the downlink channel in the bandwidth is transformed from frequency domain to time domain to obtain the time domain samples of the downlink channel; in the time domain samples, Perform blind detection at a designated location to obtain control information transmitted on the control channel. The control information includes the resource location of the data channel before time domain to frequency domain transformation; according to the data channel’s time domain to frequency domain transformation For the previous resource location, the information transmitted on the data channel is obtained from the time-domain samples of the downlink channel.

In a fourteenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute the first or fourth aspects as described above The method of any one of.

In a fifteenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute the second or third aspects described above The method of any one of.

In the above-mentioned embodiment of the present application, the downlink reference signal is used to indicate the frequency domain resource allocation information of the downlink channel (the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location), so that the receiving end of the downlink channel (terminal ) Data detection can be performed based on frequency domain resource allocation information. Specifically, when IDFT transformation is performed, the number of subcarriers occupied by the downlink transmission data can be obtained according to the frequency domain resource allocation information, and then the number of IDFT points can be obtained, thereby obtaining the data transmitted on the downlink channel information.

Description of the drawings

FIG. 1 is a schematic diagram of a flow chart of downlink transmission implemented on the terminal side according to Solution 1 of the embodiment of the application;

Fig. 2 is a schematic diagram of resource mapping of CRS, PDCCH, and PDSCH in an embodiment of the application;

FIG. 3 is a schematic diagram of a flow of downlink transmission implemented on the network device side according to the first solution of the embodiment of the application;

4 is a schematic diagram of a flow chart of downlink transmission implemented on the terminal side according to the second solution of the embodiment of the application;

FIG. 5 is a schematic diagram of a flow chart of downlink transmission implemented on the network device side provided by the second embodiment of the application;

Figure 6 is a schematic diagram of a downlink channel transmission process provided by an embodiment of the application;

FIG. 7 is a schematic diagram of frequency division multiplexing of PDCCH and PDSCH in an embodiment of the application;

FIG. 8 is a schematic diagram of filling redundant signals in an embodiment of the application;

Figures 9a and 9b are schematic diagrams of the flow of downlink transmission and reception according to an embodiment of this application;

Figure 10 and Figure 11 are schematic diagrams of the structure of a terminal provided by an embodiment of this application;

Figures 12 and 13 are schematic diagrams of the structure of a network device provided by an embodiment of this application;

FIG. 14 is a schematic structural diagram of another terminal provided by an embodiment of this application;

15 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 16 is a schematic structural diagram of a first communication device provided by another embodiment of this application;

FIG. 17 is a schematic structural diagram of a second communication device provided by another embodiment of this application;

FIG. 18 is a schematic structural diagram of a communication device applicable to a terminal according to another embodiment of the application.

detailed description

Hereinafter, some terms in the embodiments of the present application will be explained to facilitate the understanding of those skilled in the art.

(1) In the embodiments of this application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand their meaning.

(2) The term "multiple" in the embodiments of this application refers to two or more than two, and other measure words are similar.

(3) "and/or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone. . The character "/" generally indicates that the associated objects are in an "or" relationship.

(4) The "terminal" in the embodiments of this application is a device that provides users with voice and/or data connectivity, and may include various handheld devices, vehicle-mounted devices, wearable devices, and computing devices with wireless communication functions. , Drones or other processing equipment connected to the wireless modem, and various forms of user equipment (User Equipment, UE), mobile station (Mobile station, MS), terminal (Terminal Equipment), transmission point (transmission and receiver point) , TRP or transmission point, TP) and so on.

(5) "Network equipment" in the embodiments of this application is a device that connects a terminal to a wireless network, including but not limited to: evolved Node B (evolved Node B, eNB), radio network controller (Radio Network Controller, RNC), Node B (Node B, NB), Base Station Controller (BSC), Base Transceiver Station (BTS), Femtocell (for example, Home evolved NodeB, or Home Node B) , HNB), Base Band Unit (BBU), Wireless Fidelity (WIFI) access point (Access Point, AP), transmission point (transmission and receiver point, TRP or transmission point, TP), continue Evolved Node B (gNB), radio access network (RAN) node, etc.

In the long term evolution (LTE) system and the 5G NR (fifth generation new access) system, the downlink signal waveform adopts OFDM, the data of multiple users is transmitted in frequency division multiplexing, and the control channel (such as PDCCH) ) And data channels (such as PDSCH) are also transmitted by frequency division multiplexing, and different users or different channels are mapped to different physical resource blocks (PRB). The resource allocation information of the PDSCH can be obtained through the indication of the PDCCH, and multiple users can share time-frequency resources.

In satellite communications, 5G technology is also being considered for transmission. However, the satellite downlink is limited by the satellite power amplifier. In order to improve the efficiency of the power amplifier, the downlink usually works in the non-linear region, which requires downlink transmission. The signal waveform adopts a single carrier waveform. The most suitable signal waveform is DFT-S-OFDM, which can maintain good PAPR characteristics. In order to further reduce the peak-to-average ratio, a DFT transformation is used in the downlink transmission bandwidth. At the transmitting end, the PDSCH and PDCCH of multiple users are first time-domain multiplexed, then DFT transformed, and then mapped to sub-carriers, and then inverse fast fourier transform (IFFT) is required. The number of IFFT points can exceed the actual number of subcarriers, and the subcarriers are filled with 0 without expanding the bandwidth.

When performing IDFT conversion, the number of IDFT points is the number of subcarriers actually occupied, which requires the terminal as the receiving end to know the number of subcarriers occupied by the transmitted signal in advance. For the number of IFFT points, it matches with the sender. Therefore, it is a necessary step to indicate the bandwidth of the transmitted signal, otherwise the terminal cannot perform data detection.

In response to the above problems, the embodiments of the present application provide a downlink transmission method and device, which can indicate to the terminal the frequency domain resource allocation information for downlink transmission through a reference signal or information transmitted on a dedicated channel during downlink transmission, so that the terminal Data detection can be performed according to the bandwidth of the transmitted signal.

Specifically, the embodiments of this application provide the following two solutions:

Solution 1: Indicate frequency domain resource allocation information for downlink transmission through a reference signal;

Scheme 2: The information transmitted on the dedicated channel indicates the frequency domain resource allocation information for downlink transmission.

The embodiments of the present application will be described in detail below in conjunction with the drawings.

Referring to FIG. 1, it is a schematic diagram of the flow of downlink transmission implemented on the terminal side according to the first solution of the embodiment of this application. As shown in the figure, the flow may include:

S101: The terminal receives a downlink reference signal.

Wherein, the sequence and/or frequency domain position of the downlink reference signal may indicate frequency domain resource allocation information of the downlink channel.

The downlink channel includes a downlink data channel (such as PDSCH), or includes a downlink control channel (such as PDCCH), or includes both a downlink data channel and a downlink data channel.

The frequency domain resource allocation information of the downlink channel may include the bandwidth of the downlink channel, for example, the bandwidth of the downlink channel may be represented by the number of subcarriers occupied by the downlink channel. The frequency domain resource allocation information of the downlink channel may also include the frequency domain resource position of the downlink channel. For example, the frequency domain resource position of the downlink channel may be indicated by the index of the subcarrier occupied by the downlink channel or the index of the occupied PRB. The bandwidth of the downlink channel can also be obtained according to the frequency domain resource location of the downlink channel. The frequency domain resource allocation information of the downlink channel may also include both the bandwidth of the downlink channel and the frequency domain resource location of the downlink channel.

The downlink reference signal may be a cell-specific reference signal, also called a common reference signal (cell-specific reference signals, CRS), or other types of reference signals. When each satellite beam corresponds to a cell, the CRS may also be beam-specific Reference signal.

Taking CRS as an example, the first OFDM symbol of each slot is used to transmit CRS. The bandwidth of the CRS is determined, and the bandwidth of the CRS can be agreed or pre-configured by the system. The bandwidth of the PDCCH or PDSCH is variable. Figure 2 exemplarily shows the resource mapping situation of CRS, PDCCH, and PDSCH. As shown in Figure 2, a slot contains 14 symbols. The 14 symbols can be divided into 3 parts. The first symbol is used to transmit CRS, the second to third symbols are used to transmit PDCCH, and the second to third symbols are used to transmit PDCCH. The 4th to 14th symbols are used to transmit PDSCH.

Within the symbol positions occupied by the downlink reference signal, the downlink reference signal usually does not occupy all frequency domain resources. For example, as shown in Figure 2, in the first symbol, the CRS is only mapped to part of the subcarriers in the PRB occupied by it. The subcarriers occupied by CRS can be pre-appointed or pre-configured by the system.

S102: The terminal obtains frequency domain resource allocation information of the downlink channel according to the sequence and/or frequency domain position of the downlink reference signal.

In this step, the terminal can use the following three methods (Method 1, Method 2, and Method 3) to obtain frequency domain resource allocation information of the downlink channel.

Method 1: The terminal obtains the frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal according to the position of the subcarrier occupied by the downlink reference signal.

Wherein, there is a correspondence between the position of the subcarrier occupied by the downlink reference signal and the frequency domain resource allocation information of the downlink channel, for example, there is a one-to-one correspondence between the position of the subcarrier occupied by the downlink reference signal and the frequency domain resource allocation information of the downlink channel. The corresponding relationship can be pre-appointed or pre-configured.

The position of the subcarrier occupied by the downlink reference signal may be represented by the number of subcarrier intervals between the subcarriers occupied by the downlink reference signal. Take CRS as an example. CRS occupies the first symbol of a time slot in the time domain and can be sent in an interval in the frequency domain. That is, there is a certain interval between the subcarriers occupied by CRS, such as 1 or 2 every interval. One or three subcarriers transmit CRS. As shown in Figure 2, the number of sub-carrier spacings of the CRS in the frequency domain is 2. Different subcarrier spacing numbers can indicate different downlink channel frequency domain resource allocation information, so the terminal can obtain corresponding downlink channel frequency domain resource allocation information according to the CRS subcarrier spacing number.

For example, if the number of subcarrier intervals of CRS is 1, the frequency domain resource allocation information of the corresponding downlink channel is PRB n1 to PRB n2 (n1 and n2 represent the indexes of PRB); if the number of subcarrier intervals of CRS is 2, It indicates that the frequency domain resource allocation information of the downlink channel is PRB n3 to PRB n4 (n3 and n4 represent the index of the PRB).

The position of the subcarrier occupied by the downlink reference signal may also be represented by the position offset between the subcarriers occupied by the downlink reference signal. Take CRS as an example. CRS occupies the first symbol of a time slot in the time domain and can be sent in an interval in the frequency domain. That is, there is a certain interval between the subcarriers occupied by CRS, such as 1 or 2 every interval. One or three subcarriers transmit CRS. Taking the number of subcarrier spacing as an example, within the entire bandwidth occupied by the CRS, the subcarrier position index occupied by the CRS may be odd or even, depending on the subcarrier position offset of the CRS. Different subcarrier position offsets can indicate different downlink channel frequency domain resource allocation information, so the terminal can obtain corresponding downlink channel frequency domain resource allocation information according to the CRS subcarrier position offset.

Method 2: The terminal obtains the frequency domain resource allocation information of the downlink channel according to the sequence of the downlink reference signal.

In a possible implementation of the second method above, the terminal may obtain the frequency domain resource allocation information of the downlink channel according to the initial generation function of the sequence of the downlink reference signal. The initial generation function of the sequence of the downlink reference signal is calculated according to the index of the frequency domain resource allocation information of the downlink channel.

Taking CRS as an example, the CRS can use a pseudo-random sequence (PN sequence) or multiply a PN sequence and an orthogonal OCC sequence. The initial generation function of the PN sequence can be used to indicate the frequency domain resource allocation information of the downlink channel.

For example, the transmission bandwidth of the downlink channel can be divided into 8 levels, and each transmission bandwidth level can be identified by a corresponding index, as shown in Table 1.

Table 1: Bandwidth index and corresponding bandwidth size

Among them, BW represents the transmission bandwidth, BWID represents the index of the transmission bandwidth, and the value of BW can be agreed by the system or configured in advance. In Table 1, the downlink channel transmission bandwidth may also be 0, that is, there is no downlink control channel or data channel transmission in the current slot.

In the case of CRS using PN sequence, the initialization generating function of PN sequence can be calculated according to the BWID in Table 1. Specifically, the initialization generating function can be expressed as:

c _init = (2 ¹⁰ ·(14·n _s +l+1)·(2·(BWID+NID)+1)+BWID+NID)mod 2 ³¹

Among them, BWID represents the index of the transmission bandwidth, and its value can be as shown in Table 1. l represents the position of the OFDM symbol where the CRS is located in a slot; n _s represents the slot where the CRS is located in a radio The index value in the frame; NID is used to distinguish satellite beam index values. Here, the satellite beam index NID depends on the system configuration. It can correspond to a series of beam index ID values or be related to the satellite index ID. In special cases, it can also be set to 0.

After the terminal detects the CRS, it can calculate the BWID according to the detected PN sequence and the initialization generating function that generates the PN sequence, so as to obtain the indicated bandwidth size according to the BWID.

In another possible implementation manner of the second method above, the terminal may obtain the frequency domain resource allocation information of the downlink channel according to the bit at the specified position in the sequence of the downlink reference signal. Wherein, the bit at the specified position in the sequence of the downlink reference signal is used to indicate the index of the frequency domain resource allocation information of the downlink channel.

Taking CRS as an example, when using bits at a designated position in the CRS sequence to indicate the frequency domain resource allocation information of the downlink channel, the bandwidth size and the position of the subcarrier can be indicated.

For example, taking 5 bits for indication as an example, the last 3 bits in the CRS sequence are used to indicate the size of the bandwidth, and the first 2 bits in the CRS sequence are used to indicate the start position of the frequency domain. These 5 bits can be used as downlink The index of the frequency domain resource allocation information of the channel is used to indicate the frequency domain resource allocation information of the downlink channel. Table 2 shows the frequency domain resource allocation information index of the downlink channel and the corresponding frequency domain resource allocation information.

Table 2: Frequency domain resource allocation information index of the downlink channel and corresponding frequency domain resource allocation information

TBW represents the total bandwidth of the system, and the total bandwidth of the system is agreed by the system.

Method 3: The above method 1 and the above method 2 can also be used in combination.

For example, the subcarrier position of the CRS plus the sequence is used to jointly indicate the frequency resource of the downlink channel. As an example, if the index of the frequency domain resource allocation information of the downlink channel is N-bit information, the first K bits of information can be indicated by the subcarrier position of the CRS, and the last (N-K) bit information can be indicated by the sequence of the CRS. Among them, K is greater than 1 and less than N.

S103: The terminal obtains the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

Optionally, the aforementioned downlink control channel may include downlink control channels of one or more terminals, that is, the network device may send control information of one terminal or control information of multiple terminals through the downlink control channel.

Optionally, the foregoing downlink data channel may include downlink data channels of one or more terminals. For example, the network device may send data of multiple terminals in symbols other than the symbols occupied by the control channel, such as the 4th to 14th symbols in FIG. 2.

Refer to Figure 3, which is a schematic diagram of the flow of downlink transmission implemented on the network device side according to the first solution of the embodiment of the present application. As shown in the figure, the flow may include:

S301: The network device generates a downlink reference signal.

The downlink reference signal may be a cell-specific reference signal, also called CRS, or other types of reference signals. Taking CRS as an example, a possible situation of resource mapping of CRS, PDCCH, and PDSCH may be shown in FIG. 2.

For using the frequency domain position of the downlink reference signal to indicate the frequency domain resource allocation information of the downlink channel, in a possible implementation manner, the subcarrier position occupied by the downlink reference signal may be used to indicate the frequency domain resource allocation information of the downlink channel. Wherein, the position of the subcarrier occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel. The position of the subcarrier occupied by the downlink reference signal includes at least one of the following: the number of subcarrier intervals between the subcarriers occupied by the downlink reference signal, and the position offset of the subcarrier occupied by the downlink reference signal. For specific implementation, refer to the relevant description in the process shown in Figure 1.

For the use of the downlink reference signal sequence to indicate the frequency domain resource allocation information of the downlink channel, in a possible implementation manner, the initial generation function of the downlink reference signal sequence may be used to indicate the frequency domain resource allocation information of the downlink channel. Wherein, the initial generation function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the initial generation function of the sequence of the downlink reference signal is calculated according to the index of the frequency domain resource allocation information of the downlink channel get. For details, please refer to the relevant description in the process shown in Figure 1.

For the use of the downlink reference signal sequence to indicate the frequency domain resource allocation information of the downlink channel, in another possible implementation manner, a bit at a specified position in the downlink reference signal sequence may be used to indicate the index of the frequency domain resource allocation information of the downlink channel . For details, please refer to the relevant description in the process shown in Figure 1.

Optionally, the subcarrier position and sequence of the downlink reference signal may be used to jointly indicate the frequency domain resource allocation information of the downlink channel.

S302: The network device sends the generated downlink reference signal.

According to the processes shown in Figure 1 and Figure 2 above, it can be seen that the frequency domain resource allocation information of the downlink channel is indicated by the downlink reference signal (the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location), so that The receiving end (terminal) of the downlink channel can perform data detection according to the frequency domain resource allocation information. Specifically, when performing IDFT transformation, it can obtain the number of subcarriers occupied by the downlink transmission data according to the frequency domain resource allocation information, and then obtain the number of IDFT points. In order to obtain the information transmitted on the downlink channel.

The signal at the transmitting end undergoes DFT transformation in each TTI. The smallest granularity of a TTI is a slot. Therefore, the indication of the frequency domain resource allocation information of the downlink channel needs to be indicated in each slot. In the embodiment of this application, CRS is taken as an example. Since CRS is used to indicate the frequency domain resource allocation information of the downlink channel, and the CRS is sent in the first symbol of each time slot, the frequency domain resource allocation of the downlink channel can be made Information is indicated in each time slot.

Refer to Figure 4, which is a schematic diagram of a downlink transmission process implemented on the terminal side provided in the second embodiment of this application. The process may include:

S401: The terminal receives information transmitted on the dedicated channel.

Wherein, in the time domain, the dedicated channel may occupy the same symbol as a reference signal (such as a CRS); in the frequency domain, the dedicated channel may occupy a subcarrier that is not occupied by the reference signal. Taking Fig. 2 as an example, the dedicated channel is on the same OFDM symbol as the CRS in the time domain, and occupies the subcarriers where the blank squares on the CRS symbol are located in the frequency domain.

The information transmitted on the dedicated channel may be used to indicate frequency domain resource allocation information of the downlink channel.

For example, in some embodiments, the corresponding relationship between the sequence transmitted on the dedicated channel and the frequency domain resource allocation information of the downlink channel can be set, and different sequences can correspond to different frequency domain resource allocation information, so that the terminal can follow The sequence of the detected dedicated channel obtains the frequency domain resource allocation information of the corresponding downlink channel.

For another example, in some embodiments, modulated data symbols are used for information transmission on a dedicated channel, and the transmitted information may include an index of frequency domain resource allocation information of the downlink channel. After being modulated and mapped, the transmitted information is sent on a dedicated channel. In this way, after the terminal detects the information transmitted on the dedicated channel, it can obtain the index of the frequency domain resource allocation information of the downlink channel, so that the corresponding frequency domain resource allocation information can be obtained according to the index.

Wherein, the downlink channel includes a downlink data channel (such as PDSCH), or includes a downlink control channel (such as PDCCH), or includes both a downlink data channel and a downlink data channel.

S402: The terminal obtains frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel.

S403: The terminal obtains the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

Referring to Fig. 5, it is a schematic diagram of the downlink transmission process implemented on the network device side provided by the second solution of the embodiment of the present application. The process may include:

S501: The network device generates information for sending on a dedicated channel.

Among them, the dedicated channel and the information transmitted on the dedicated channel can be referred to the related description in FIG. 4. For the downlink channel and the frequency domain resource allocation information of the downlink channel, refer to the related description in FIG. 4.

In this step, the network device may generate information for transmission on the dedicated channel according to the frequency domain resource allocation information of the downlink channel, so that the information can indicate the frequency domain resource allocation information of the downlink channel.

S502: The network device sends the information on the dedicated channel.

According to the processes shown in Figures 4 and 5 above, it can be seen that the frequency domain resource allocation information of the downlink channel is indicated through the dedicated channel (the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location), so that the downlink The receiving end (terminal) of the channel can perform data detection according to the frequency domain resource allocation information. Specifically, when performing IDFT transformation, it can obtain the number of subcarriers occupied by the downlink transmission data according to the frequency domain resource allocation information, and then obtain the number of IDFT points. Obtain the information transmitted on the downlink channel.

The signal at the transmitting end undergoes DFT transformation in each TTI. The smallest granularity of a TTI is a slot. Therefore, the indication of the frequency domain resource allocation information of the downlink channel needs to be indicated in each slot. In the embodiment of this application, the dedicated channel and CRS are transmitted by frequency division multiplexing as an example. Since the dedicated channel and CRS are transmitted on the same symbol, that is, transmitted on the first symbol of each time slot, the downlink channel The frequency domain resource allocation information is indicated in each time slot.

For the application of the downlink DFT-S-OFDM waveform, another prominent issue is the efficiency. Since the downlink control channel (such as PDCCH) usually occupies the first few symbols, and the number of the user's downlink control channel is variable, it is wasteful to reserve fixed resources for the downlink control channel. In order to improve resource utilization, the downlink control channel (such as PDCCH) and the downlink data channel (such as PDSCH) can be frequency-multiplexed. As shown in FIG. 2, in the symbol positions occupied by the PDCCH (the second to third symbols), if the PDCCH does not occupy all frequency domain resources, the PDCCH can be multiplexed with the PDSCH. However, due to the application of single-carrier waveform DFT-S-OFDM, the signal mapping must be continuous, so that the variable downlink control channel needs to be mapped with a variable downlink data channel in a certain combination to ensure that the signal mapping is continuous , Which not only maintains the PAPR characteristics, but also maintains the maximum utilization of resources.

Considering that multiple users share time-frequency resources for downlink transmission, the downlink data channel and downlink control channel of multiple users will be sent at the same time. In order to reduce PAPR, the data channel and control channel between users can be multiplexed in the time domain first. Then map to the frequency domain. Since the resources occupied by the control channel and the data channel are variable, and the number of users is also variable, how to maintain the maximum multiplexing efficiency, detection flexibility, and single-carrier PAPR characteristics, for the multiplexing of data channels and control channels A special design is required to meet the needs of the system.

To this end, in some embodiments of the present application, among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel may be time-domain multiplexed and then DFT performed before transmission. Of course, the data channel here can be the data of a single user or the data of multiple users. In some other embodiments, in the frequency domain resources of the downlink channel, in the symbols occupied by the control channel, the control channel and the data channel may be time-domain multiplexed, and in the symbols occupied by the data channel, multiple users Time-domain multiplexing is performed on the data signal, and the time-domain multiplexed signal is subjected to DFT for transmission.

Optionally, as shown in FIG. 6, among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the process of the network device first time-domain multiplexes the control channel and the data channel and then performs DFT may include:

S601: The network device performs time-domain continuous mapping of the control information that needs to be transmitted on the control channel according to the symbols occupied by the control channel, and the unoccupied position of the signal sample corresponding to the control channel obtained after continuous mapping in the time domain will be required The information transmitted on the data channel is time-domain mapped to obtain time-domain signal samples of the control channel and the data channel.

In this step, the signal samples corresponding to the control channel are continuous regions, and the information that needs to be transmitted on the data channel can be mapped to positions on both sides of the region.

It should be noted that the foregoing control channel or data channel continuous signal sample allocation is a relatively simple implementation method. In an actual system, since the total transmission bandwidth is known in advance during data detection, the difference between the data channel and the control channel is Time domain samples can also be non-continuous mapping.

S602: The network device performs DFT transformation on the time domain signal samples after the multiplexing of the control channel and the data channel to obtain frequency domain signal samples of the control signal and the data channel.

Among them, each frequency domain signal sample after DFT transformation corresponds to a subcarrier.

S603: The network device performs frequency domain mapping on the frequency domain signal samples of the control channel and the data channel according to the bandwidth of the control channel and the data channel.

In this step, after frequency domain mapping is performed on the frequency domain signal samples of the control channel and the data channel, the bandwidth occupied by the control channel and the data channel is the same as the bandwidth indicated by the downlink reference signal.

Optionally, the above-mentioned control channel may include control channels of multiple users, and the control channels of multiple users are continuously mapped in a designated area in the time domain symbol area corresponding to the downlink channel. Wherein, the designated area may be the central area in the time domain symbol area corresponding to the downlink channel.

Optionally, the aforementioned data channel may include data channels of multiple users. The data channel of each user is individually mapped in a region outside the time domain symbol region where the control channel is located, for example, mapped on both sides of the time domain symbol region where the control channel is located.

Optionally, in a region other than the time domain symbol region where the control channel is located, the data channel is also continuously mapped and maintains the same bandwidth as the control channel.

Optionally, the control information transmitted on the control channel may include resource location information of the data channel before DFT transformation, that is, include resource location indication information of time domain signal samples of the data channel.

Based on the process shown in FIG. 6 above, FIG. 7 exemplarily shows a schematic diagram of frequency division multiplexing of PDCCH and PDSCH. As shown in the figure, the control information transmitted on the PDCCH can be continuously mapped in the center of the time domain symbol area 701, and then the information that needs to be transmitted on the PDSCH can be time-domain on both sides of the time domain symbol area 702 of the PDCCH. Mapping; then the time domain signal samples in the time domain symbol area 702 of the PDCCH and the time domain signal samples in the time domain symbol area (703a, 703b) of the PDSCH are DFT transformed.

Based on the process shown in Figure 6 above, on the terminal side, the terminal first performs IDFT transformation on the information transmitted on the downlink channel, and then performs blind detection of the control channel at the specified sample position of the time delay, and obtains the data channel in the time domain sample. To obtain the information transmitted on the data channel.

Specifically, the terminal can transform the information received on the downlink channel within the bandwidth from the frequency domain to the time domain (IDFT transform) according to the bandwidth position of the downlink channel to obtain the time domain samples of the downlink channel; Blind detection is performed at the designated position in the sample to obtain the control information transmitted on the control channel. The control information may include the resource position of the data channel before the time domain to frequency domain transformation (DFT); the terminal according to the data channel in the time domain The resource location before frequency domain transformation is obtained from the time domain samples of the downlink channel to obtain the information transmitted on the data channel.

In the case where the bandwidth of the downlink channel is relatively large, the data channel after DFT transformation cannot occupy the designated bandwidth, and the designated bandwidth is equal to the bandwidth after the DFT transformation after the control channel and the data channel are time-domain multiplexed. For this reason, in some embodiments of the present application, some redundant signals may be filled on the basis of the process shown in FIG. 6 so that the data channel can occupy a designated bandwidth.

Specifically, based on the process shown in FIG. 6, after the network device obtains the time domain signal samples of the control channel and the data channel, the following steps are further included:

If the network device judges that the bandwidth of the data channel is less than the specified bandwidth, it fills the time domain samples of the redundant signal in the time domain signal samples of the control channel and the data channel according to the bandwidth of the data channel and the specified bandwidth. In this way, when the network device performs DFT conversion on the time domain signal samples of the control channel and the data channel, the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal can be uniformly subjected to the DFT conversion.

Fig. 8 exemplarily shows a schematic diagram of performing DFT transformation after filling redundant signals. As shown in the figure, when the PDSCH is mapped in the time domain, some redundant symbols are mapped on both sides of the PDSCH, such as the symbol of the data information bit 0 after being modulated. At the receiving end, the terminal can obtain the actual time domain position occupied by the PDSCH through the indication of the PDCCH, and will not be affected by these redundant signals. The function of the filled redundant symbols is to make the bandwidth occupied by the transmitted signal equal to the bandwidth indicated by the CRS, and the receiving end can perform IDFT transformation based on the bandwidth indicated by the CRS.

The processes shown in FIGS. 6 and 7 above can be used in combination with the first embodiment of the present application, can also be used in combination with the second embodiment of the present application, or can be used independently.

In some embodiments that use the process shown in FIG. 6 in combination with the first solution of the embodiment of the application, as shown in FIG. 9a, at the transmitting end, the network device performs constellation mapping 902 on the bit stream 901 to be sent, and then performs serialization. /Parallel conversion 903, and then perform fast Fourier transform (IFFT) 904 on the converted multiple streams, and then perform signal-to-subcarrier mapping 905, IFFT transformation 906, add cyclic prefix 907, and perform parallel /String conversion 908, and send. The bit stream 901 to be sent includes a CRS sequence, and the CRS sequence may be used to indicate frequency domain resource allocation information of the downlink channel. The frequency domain resource location of the CRS may also be used to indicate frequency domain resource allocation information of the downlink channel. In the process of performing FFT transformation 904, the multiplexing method of PDCCH and PDSCH provided in the foregoing embodiment of the present application may be used.

As shown in Figure 9b, at the receiving end, the terminal receives the information sent by the network device, removes the cyclic prefix 910, then performs FFT transformation 911, then IDFT transformation 912, and finally performs signal detection 913 to obtain the information sent by the network device. Wherein, during the IDFT transformation 912, the IDFT transformation may be performed according to the frequency domain resource allocation information of the downlink channel indicated by the reference signal or the information transmitted on the dedicated channel.

Based on the same technical concept, an embodiment of the present application also provides a terminal. The terminal can implement the functions of the terminal side in the first solution of the foregoing embodiment.

Refer to FIG. 10, which is a schematic structural diagram of a terminal provided by an embodiment of this application. As shown in the figure, the terminal may include: a receiving module 1001 and a processing module 1002.

The receiving module 1001 is used to receive downlink reference signals.

The processing module 1002 is configured to obtain frequency domain resource allocation information of a downlink channel according to the sequence and/or frequency domain position of the downlink reference signal; wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position, so The downlink channel includes a downlink data channel and/or a downlink control channel; and, according to frequency domain resource allocation information of the downlink channel, information transmitted on the downlink channel is obtained.

In a possible implementation manner, the processing module 1002 is specifically configured to:

Based on the same technical concept, an embodiment of the present application also provides a terminal. The terminal can implement the terminal side functions in the second solution of the foregoing embodiment.

Refer to FIG. 11, which is a schematic structural diagram of a terminal provided in an embodiment of this application. As shown in the figure, the terminal may include: a receiving module 1101 and a processing module 1102.

The receiving module 1101 is used to receive information transmitted on a dedicated channel.

The processing module 1102 is configured to obtain frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel; wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes downlink A data channel and/or a downlink control channel; and, according to the frequency domain resource allocation information of the downlink channel, information transmitted on the downlink channel is obtained.

In a possible implementation manner, the processing module 1102 is specifically configured to:

Based on the same technical concept, the embodiment of the present application also provides a network device. The network device can realize the functions of the network device side in the second solution of the foregoing embodiment.

Refer to FIG. 12, which is a schematic structural diagram of a network device provided by an embodiment of this application. As shown in the figure, the network device may include: a processing module 1201 and a sending module 1202.

The processing module 1201 is configured to generate a downlink reference signal, where the sequence and/or frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of the downlink channel, and the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position , The downlink channel includes a downlink data channel and/or a downlink control channel;

The sending module 1202 is configured to send the downlink reference signal.

In a possible implementation manner, the frequency domain position of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel, including:

In a possible implementation manner, the processing module 1201 is further configured to:

In a possible implementation manner, the processing module 1201 is specifically configured to:

Refer to FIG. 13, which is a schematic structural diagram of a network device provided by an embodiment of this application. As shown in the figure, the network device may include: a processing module 1301 and a sending module 1302.

The processing module 1301 is configured to generate information for sending on a dedicated channel, the information being used to indicate frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location , The downlink channel includes a downlink data channel and/or a downlink control channel;

The sending module 1302 is configured to send the information on the dedicated channel.

In a possible implementation manner, the processing module 1301 is further configured to:

In a possible implementation manner, the processing module 1301 is specifically configured to:

The processing module 1301 is specifically configured to: uniformly perform discrete Fourier transform on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.

Based on the same technical concept, an embodiment of the present application also provides a terminal.

Refer to FIG. 14, which is a schematic structural diagram of a terminal provided in an embodiment of this application. As shown in the figure, the terminal may include: a first acquiring module 1401 and a second acquiring module 1402.

The first obtaining module 1401 is configured to obtain frequency domain resource allocation information of a downlink channel;

The second obtaining module 1402 is configured to obtain information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel;

Wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; the control channel occupied by the frequency domain resources of the downlink channel Among the symbols, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform and then transmitted; or in the frequency domain resources of the downlink channel, in the symbols occupied by the control channel , The control channel and the data channel are time-domain multiplexed, among the symbols occupied by the data channel, the data signals of multiple users are time-domain multiplexed, and then the time-domain multiplexed signal is subjected to discrete Fourier After the inner leaf is transformed, it is transmitted.

In a possible implementation manner, the second obtaining module 1402 is specifically configured to:

Based on the same technical concept, an embodiment of the present application also provides a communication device, which may be a terminal, and can implement the functions implemented on the terminal side in the embodiment of the present application.

Refer to FIG. 15, which is a schematic structural diagram of a communication device provided by an embodiment of this application. As shown in the figure, the communication device may include: a processor 1501, a memory 1502, a transceiver 1503, and a bus interface 1504.

The processor 1501 is responsible for managing the bus architecture and general processing, and the memory 1502 can store data used by the processor 1501 when performing operations. The transceiver 1503 is used to receive and send data under the control of the processor 1501.

The bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1501 and various circuits of the memory represented by the memory 1502 are linked together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein. The bus interface provides the interface. The processor 1501 is responsible for managing the bus architecture and general processing, and the memory 1502 can store data used by the processor 1501 when performing operations.

The process disclosed in the embodiment of the present application may be applied to the processor 1501 or implemented by the processor 1501. In the implementation process, each step of the signal processing flow can be completed by hardware integrated logic circuits in the processor 1501 or instructions in the form of software. The processor 1501 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, a discrete hardware component, and can implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory 1502, and the processor 1501 reads the information in the memory 1502 and completes the steps of the signal processing flow in combination with its hardware.

Specifically, the processor 1501 is configured to read computer instructions in the memory 1502 and execute:

In a possible implementation manner, the processor 1501 is specifically configured to:

Based on the same technical concept, an embodiment of the present application also provides a communication device, which may be a network device, such as a base station, which can implement the functions implemented on the network device side in the first solution of the embodiment of the present application.

Refer to FIG. 16, which is a schematic structural diagram of a communication device provided by an embodiment of this application. As shown in the figure, the communication device may include: a processor 1601, a memory 1602, a transceiver 1603, and a bus interface 1604.

The processor 1601 is responsible for managing the bus architecture and general processing, and the memory 1602 can store data used by the processor 1601 when performing operations. The transceiver 1603 is used to receive and send data under the control of the processor 1601.

The bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1601 and various circuits of the memory represented by the memory 1602 are linked together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein. The bus interface provides the interface. The processor 1601 is responsible for managing the bus architecture and general processing, and the memory 1602 can store data used by the processor 1601 when performing operations.

The process disclosed in the embodiment of the present application may be applied to the processor 1601 or implemented by the processor 1601. In the implementation process, each step of the signal processing flow can be completed by hardware integrated logic circuits in the processor 1601 or instructions in the form of software. The processor 1601 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, a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory 1602, and the processor 1601 reads the information in the memory 1602 and completes the steps of the signal processing flow in combination with its hardware.

Specifically, the processor 1601 is configured to read computer instructions in the memory 1602 and execute:

A downlink reference signal is generated, the sequence and/or frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of the downlink channel, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position, and the downlink channel includes Downlink data channel and/or downlink control channel;

Sending the downlink reference signal through the transceiver.

In a possible implementation manner, the processor 1601 is further configured to:

In a possible implementation manner, the processor 1601 is specifically configured to:

Based on the same technical concept, an embodiment of the present application also provides a communication device, which may be a network device, such as a base station, which can implement the functions implemented on the network device side in the second solution of the embodiment of the present application.

Refer to FIG. 17, which is a schematic structural diagram of a communication device provided by an embodiment of this application. As shown in the figure, the communication device may include a processor 1701, a memory 1702, a transceiver 1703, and a bus interface 1704.

The processor 1701 is responsible for managing the bus architecture and general processing, and the memory 1702 can store data used by the processor 1701 when performing operations. The transceiver 1703 is used to receive and transmit data under the control of the processor 1701.

The bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1701 and various circuits of the memory represented by the memory 1702 are linked together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits. These are all well-known in the art, and therefore, no further description will be given here. The bus interface provides the interface. The processor 1701 is responsible for managing the bus architecture and general processing, and the memory 1702 can store data used by the processor 1701 when performing operations.

The process disclosed in the embodiment of the present application may be applied to the processor 1701 or implemented by the processor 1701. In the implementation process, each step of the signal processing flow can be completed by hardware integrated logic circuits in the processor 1701 or instructions in the form of software. The processor 1701 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, a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory 1702, and the processor 1701 reads the information in the memory 1702 and completes the steps of the signal processing flow in combination with its hardware.

Specifically, the processor 1701 is configured to read computer instructions in the memory 1702 and execute:

The information is sent on the dedicated channel through the transceiver.

In a possible implementation manner, the processor 1701 is further configured to:

In a possible implementation manner, the processor 1701 is specifically configured to:

The processor 1701 is specifically configured to: uniformly perform discrete Fourier transform on the time-domain signal samples of the control channel and the data channel and the time-domain samples of the redundant signal.

Referring to FIG. 18, a schematic structural diagram of a communication device provided by an embodiment of this application. As shown in the figure, the communication device may include: a processor 1801, a memory 1802, a transceiver 1803, and a bus interface 1804.

The processor 1801 is responsible for managing the bus architecture and general processing, and the memory 1802 can store data used by the processor 1801 when performing operations. The transceiver 1803 is used to receive and send data under the control of the processor 1801.

The bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1801 and various circuits of the memory represented by the memory 1802 are linked together. The bus architecture can also link various other circuits such as peripherals, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, no further descriptions are provided herein. The bus interface provides the interface. The processor 1801 is responsible for managing the bus architecture and general processing, and the memory 1802 can store data used by the processor 1801 when performing operations.

The process disclosed in the embodiment of the present application may be applied to the processor 1801 or implemented by the processor 1801. In the implementation process, each step of the signal processing flow can be completed by hardware integrated logic circuits in the processor 1801 or instructions in the form of software. The processor 1801 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, a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory 1802, and the processor 1801 reads the information in the memory 1802, and completes the steps of the signal processing flow in combination with its hardware.

Specifically, the processor 1801 is configured to read computer instructions in the memory 1802 and execute:

In a possible implementation manner, the processor 1801 is specifically configured to:

Based on the same technical concept, the embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute the process executed on the terminal side in the embodiment of the present application.

Based on the same technical concept, the embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute the process executed by the network device in the embodiment of the present application.

This application is described with reference to flowcharts and/or block diagrams of methods, equipment (systems), and computer program products according to the embodiments of this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A downlink transmission method, characterized by comprising:

The terminal receives the downlink reference signal, and obtains the frequency domain resource allocation information of the downlink channel according to the sequence and/or frequency domain position of the downlink reference signal, or the terminal receives the information transmitted on the dedicated channel, and according to the dedicated channel The information transmitted on the uplink obtains frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes a downlink data channel and/or a downlink control channel;

The terminal obtains the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.
The method according to claim 1, wherein the terminal obtaining the frequency domain resource allocation information of the downlink channel according to the frequency domain position of the downlink reference signal comprises:

The terminal obtains the frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal according to the position of the subcarrier occupied by the downlink reference signal.
The method according to claim 2, wherein the position of the subcarrier occupied by the downlink reference signal includes at least one of the following:

The number of subcarrier intervals between subcarriers occupied by the downlink reference signal;

The position offset of the subcarrier occupied by the downlink reference signal.
The method according to claim 1, wherein the terminal obtaining the frequency domain resource allocation information of the downlink channel according to the sequence of the downlink reference signal comprises:

The terminal obtains the frequency domain resource allocation information of the downlink channel according to the initial generation function of the downlink reference signal sequence; wherein, the initial generation function of the downlink reference signal sequence is according to the frequency domain resource allocation information of the downlink channel The index of is calculated; or

The terminal obtains the frequency domain resource allocation information of the downlink channel according to the bits at the specified position in the sequence of the downlink reference signal; wherein the bits at the specified position in the sequence of the downlink reference signal are used to indicate the frequency domain resources of the downlink channel Index of allocation information.
The method according to claim 1, wherein the terminal obtaining frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel comprises:

The terminal obtains the frequency domain resource allocation information of the downlink channel according to the signal sequence transmitted on the dedicated channel or the modulation symbol of the dedicated channel.
The method according to claim 1, wherein among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed and then discrete Transmit after Fourier transform; or

In the frequency domain resources of the downlink channel, among the symbols occupied by the control channel, the control channel and the data channel are time-domain multiplexed, and among the symbols occupied by the data channel, multiple users’ The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.
The method according to any one of claims 1 to 6, wherein the terminal obtaining the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel comprises:

According to the bandwidth position of the downlink channel, the terminal converts the information received on the downlink channel within the bandwidth from frequency domain to time domain to obtain time domain samples of the downlink channel;

The terminal performs blind detection at a specified position in the time domain sample to obtain control information transmitted on the control channel, where the control information includes the resource position of the data channel before the time domain to frequency domain conversion;

The terminal obtains the information transmitted on the data channel from the time domain samples of the downlink channel according to the resource position of the data channel before the time domain to frequency domain conversion.
A downlink transmission method, characterized by comprising:

The network device generates a downlink reference signal, the sequence and/or frequency domain position of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel, and the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position. The channel includes a downlink data channel and/or a downlink control channel;

The network device sends the downlink reference signal.
The method according to claim 8, wherein the frequency domain position of the downlink reference signal indicating frequency domain resource allocation information of the downlink channel comprises:

The position of the subcarrier occupied by the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; wherein the position of the subcarrier occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel.
The method according to claim 9, wherein the position of the subcarrier occupied by the downlink reference signal includes at least one of the following:

The number of subcarrier intervals between subcarriers occupied by the downlink reference signal;

The position offset of the subcarrier occupied by the downlink reference signal.
The method according to claim 8, wherein the sequence of the downlink reference signal indicating frequency domain resource allocation information of the downlink channel comprises:

The initial generation function of the sequence of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; wherein, the initial generation function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the downlink reference signal The initial generation function of the signal sequence is calculated according to the index of the frequency domain resource allocation information of the downlink channel; or

The bit at the specified position in the sequence of the downlink reference signal indicates the index of the frequency domain resource allocation information of the downlink channel.
The method of claim 8, further comprising:

Among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the network device first performs time domain multiplexing on the control channel and the data channel, and then performs discrete Fourier transform for transmission; or

In the frequency domain resources of the downlink channel, the control channel and the data channel are time-domain multiplexed among the symbols occupied by the control channel, and the symbols occupied by the data channel are used for multiple users. The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.
The method according to claim 12, wherein the network device performs time domain control on the control channel and the data channel among the symbols occupied by the control channel in the frequency domain resources of the downlink channel. Multiplexing and then performing discrete Fourier transform for transmission, including:

According to the symbols occupied by the control channel, the network device performs time-domain continuous mapping of the control information that needs to be transmitted on the control channel, and the signal samples corresponding to the control channel obtained after continuous mapping in the time domain are unoccupied Position, time-domain mapping the information that needs to be transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

The network device performs discrete Fourier transform on the time domain signal samples of the control channel and the data channel to obtain the frequency domain signal samples of the control signal and the data channel;

The network device performs frequency domain mapping on the frequency domain signal samples of the control channel and the data channel according to the bandwidth of the control channel and the data channel.
The method according to claim 13, wherein after obtaining time-domain signal samples of the control channel and the data channel, the method further comprises:

If the bandwidth of the data channel is less than the specified bandwidth, the network device fills the time domain signal samples of the control channel and the data channel with redundant signals according to the bandwidth of the data channel and the specified bandwidth Time domain samples;

The network device performing discrete Fourier transform on time-domain signal samples of the control channel and the data channel includes:

The network device uniformly performs discrete Fourier transform on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.
A downlink transmission method, characterized by comprising:

The network device generates information for sending on a dedicated channel, the information is used to indicate frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink The channel includes a downlink data channel and/or a downlink control channel;

The network device sends the information on the dedicated channel.
The method of claim 15, wherein the signal sequence transmitted on the dedicated channel or the modulation symbol of the dedicated channel indicates the frequency domain resource allocation information of the downlink channel; wherein the signal sequence and the modulation symbol of the dedicated channel The frequency domain resource allocation information of the downlink channel corresponds, and the modulation symbol of the dedicated channel corresponds to the frequency domain resource allocation information of the downlink channel.
The method according to claim 15 or 16, further comprising:

Among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the network device first performs time domain multiplexing on the control channel and the data channel, and then performs discrete Fourier transform for transmission; or

In the frequency domain resources of the downlink channel, the control channel and the data channel are time-domain multiplexed among the symbols occupied by the control channel, and the symbols occupied by the data channel are used for multiple users. The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.
The method according to claim 17, wherein the network device performs time domain control on the control channel and the data channel among the symbols occupied by the control channel in the frequency domain resources of the downlink channel. Multiplexing is transmitted after discrete Fourier transform, including:

According to the symbols occupied by the control channel, the network device performs time-domain continuous mapping of the control information that needs to be transmitted on the control channel, and the signal samples corresponding to the control channel obtained after continuous mapping in the time domain are unoccupied Position, time-domain mapping the information that needs to be transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

The network device performs discrete Fourier transform on the time domain signal samples of the control channel and the data channel to obtain the frequency domain signal samples of the control signal and the data channel;

The network device performs frequency domain mapping on the frequency domain signal samples of the control channel and the data channel according to the bandwidth of the control channel and the data channel.
The method according to claim 18, wherein after obtaining the time domain signal samples of the control channel and the data channel, the method further comprises:

If the bandwidth of the data channel is less than the specified bandwidth, the network device fills the time domain signal samples of the control channel and the data channel with redundant signals according to the bandwidth of the data channel and the specified bandwidth Time domain samples;

The network device performing discrete Fourier transform on time-domain signal samples of the control channel and the data channel includes:

The network device uniformly performs discrete Fourier transform on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.
A downlink transmission method, characterized by comprising:

The terminal obtains frequency domain resource allocation information of the downlink channel;

The terminal obtains the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel;

Wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; the control channel occupied by the frequency domain resources of the downlink channel Among the symbols, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform and then transmitted; or in the frequency domain resources of the downlink channel, in the symbols occupied by the control channel , The control channel and the data channel are time-domain multiplexed, among the symbols occupied by the data channel, the data signals of multiple users are time-domain multiplexed, and then the time-domain multiplexed signal is subjected to discrete Fourier After the inner leaf is transformed, it is transmitted.
22. The method of claim 20, wherein the terminal obtaining the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel comprises:

According to the bandwidth position of the downlink channel, the terminal converts the information received on the downlink channel within the bandwidth from frequency domain to time domain to obtain time domain samples of the downlink channel;

The terminal performs blind detection at a specified position in the time domain sample to obtain control information transmitted on the control channel, where the control information includes the resource position of the data channel before the time domain to frequency domain conversion;

The terminal obtains the information transmitted on the data channel from the time domain samples of the downlink channel according to the resource position of the data channel before the time domain to frequency domain conversion.
A terminal, characterized in that it comprises:

The receiving module is used to receive downlink reference signals;

The processing module is configured to obtain frequency domain resource allocation information of a downlink channel according to the sequence and/or frequency domain position of the downlink reference signal; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position, and The downlink channel includes a downlink data channel and/or a downlink control channel; and

Obtain the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.
A terminal, characterized in that it comprises:

The receiving module is used to receive the information transmitted on the dedicated channel;

The processing module is configured to obtain frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes downlink data Channel and/or downlink control channel; and

Obtain the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.
A network device, characterized by comprising:

The processing module is configured to generate a downlink reference signal, where the sequence and/or frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of the downlink channel, and the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position, The downlink channel includes a downlink data channel and/or a downlink control channel;

The sending module is used to send the downlink reference signal.
A network device, characterized by comprising:

The processing module is used to generate information for sending on a dedicated channel, the information is used to indicate frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, The downlink channel includes a downlink data channel and/or a downlink control channel;

The sending module is used to send the information on the dedicated channel.
A terminal, characterized in that it comprises:

The first obtaining module is configured to obtain frequency domain resource allocation information of the downlink channel;

The second obtaining module is configured to obtain the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel;

Wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; the control channel occupied by the frequency domain resources of the downlink channel Among the symbols, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform and then transmitted; or in the frequency domain resources of the downlink channel, in the symbols occupied by the control channel , The control channel and the data channel are time-domain multiplexed, among the symbols occupied by the data channel, the data signals of multiple users are time-domain multiplexed, and then the time-domain multiplexed signal is subjected to discrete Fourier After the inner leaf is transformed, it is transmitted.
A communication device, characterized by comprising: a processor, a memory, and a transceiver; the processor is used to read computer instructions in the memory and execute:

Receiving a downlink reference signal through the transceiver, and obtaining frequency domain resource allocation information of a downlink channel according to the sequence and/or frequency domain position of the downlink reference signal, or receiving information transmitted on a dedicated channel through the transceiver, The frequency domain resource allocation information of the downlink channel is obtained according to the information transmitted on the dedicated channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes a downlink data channel and/or Downlink control channel;

Obtain the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.
The communication device according to claim 27, wherein the processor is specifically configured to:

According to the position of the subcarrier occupied by the downlink reference signal, the frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal is obtained.
The communication device according to claim 28, wherein the position of the subcarrier occupied by the downlink reference signal includes at least one of the following:

The number of subcarrier intervals between subcarriers occupied by the downlink reference signal;

The position offset of the subcarrier occupied by the downlink reference signal.
The communication device according to claim 27, wherein the processor is specifically configured to:

The frequency domain resource allocation information of the downlink channel is obtained according to the initial generation function of the downlink reference signal sequence; wherein the initial generation function of the downlink reference signal sequence is calculated according to the index of the frequency domain resource allocation information of the downlink channel Get; or

The frequency domain resource allocation information of the downlink channel is obtained according to the bits at the specified position in the sequence of the downlink reference signal; wherein the bits at the specified position in the sequence of the downlink reference signal are used to indicate the frequency domain resource allocation information of the downlink channel index.
The communication device according to claim 27, wherein the processor is specifically configured to:

According to the signal sequence transmitted on the dedicated channel or the modulation symbol of the dedicated channel, the frequency domain resource allocation information of the downlink channel is obtained.
The communication device according to claim 27, wherein among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are time-domain multiplexed first and then Transmit after discrete Fourier transform; or

In the frequency domain resources of the downlink channel, among the symbols occupied by the control channel, the control channel and the data channel are time-domain multiplexed, and among the symbols occupied by the data channel, multiple users’ The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.
The communication device according to any one of claims 27-32, wherein the processor is specifically configured to:

Transform the information received on the downlink channel in the bandwidth from the frequency domain to the time domain according to the bandwidth position of the downlink channel to obtain the time domain samples of the downlink channel;

Perform blind detection at a specified position in the time domain sample to obtain control information transmitted on the control channel, where the control information includes the resource position of the data channel before time domain to frequency domain conversion;

According to the resource position of the data channel before the time domain to frequency domain conversion, the information transmitted on the data channel is obtained from the time domain samples of the downlink channel.
A communication device, characterized by comprising: a processor, a memory, and a transceiver; the processor is used to read computer instructions in the memory and execute:

Generate a downlink reference signal, the sequence and/or frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of the downlink channel, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position, and the downlink channel includes Downlink data channel and/or downlink control channel;

Sending the downlink reference signal through the transceiver.
The communication device according to claim 34, wherein the frequency domain position of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel, comprising:

The position of the subcarrier occupied by the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; wherein the position of the subcarrier occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel.
The communication device according to claim 35, wherein the position of the subcarrier occupied by the downlink reference signal includes at least one of the following:

The number of subcarrier intervals between subcarriers occupied by the downlink reference signal;

The position offset of the subcarrier occupied by the downlink reference signal.
The communication device according to claim 34, wherein the sequence of the downlink reference signal indicating frequency domain resource allocation information of the downlink channel comprises:

The initial generation function of the sequence of the downlink reference signal indicates frequency domain resource allocation information of the downlink channel; wherein, the initial generation function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the downlink reference signal The initial generation function of the signal sequence is calculated according to the index of the frequency domain resource allocation information of the downlink channel; or

The bit at the specified position in the sequence of the downlink reference signal indicates the index of the frequency domain resource allocation information of the downlink channel.
The communication device according to claim 37, wherein the processor is further configured to:

Among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform for transmission; or

In the frequency domain resources of the downlink channel, the control channel and the data channel are time-domain multiplexed among the symbols occupied by the control channel, and the symbols occupied by the data channel are used for multiple users. The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.
The communication device according to claim 38, wherein the processor is specifically configured to:

According to the symbols occupied by the control channel, the control information that needs to be transmitted on the control channel is continuously mapped in the time domain, and the unoccupied position of the signal sample corresponding to the control channel obtained after continuous mapping in the time domain will be required Time-domain mapping is performed on the information transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

Performing discrete Fourier transform on the time domain signal samples of the control channel and the data channel to obtain frequency domain signal samples of the control signal and the data channel;

According to the bandwidth of the control channel and the data channel, the frequency domain signal samples of the control channel and the data channel are subjected to frequency domain mapping.
The communication device according to claim 39, wherein the processor is further configured to:

After obtaining the time-domain signal samples of the control channel and the data channel, if the bandwidth of the data channel is less than the designated bandwidth, then according to the bandwidth of the data channel and the designated bandwidth, the control channel and the designated bandwidth The time-domain signal samples of the data channel are filled with time-domain samples of the redundant signal;

The processor is specifically configured to: uniformly perform discrete Fourier transform on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.
A communication device, characterized by comprising: a processor, a memory, and a transceiver; the processor is used to read computer instructions in the memory and execute:

Generate information for sending on a dedicated channel, the information is used to indicate frequency domain resource allocation information of the downlink channel; wherein the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, and the downlink channel includes Downlink data channel and/or downlink control channel;

The information is sent on the dedicated channel through the transceiver.
The communication device according to claim 41, wherein the signal sequence transmitted on the dedicated channel or the modulation symbol of the dedicated channel indicates frequency domain resource allocation information of the downlink channel; wherein, the signal sequence and The frequency domain resource allocation information of the downlink channel corresponds, and the modulation symbol of the dedicated channel corresponds to the frequency domain resource allocation information of the downlink channel.
The communication device according to claim 41 or 42, wherein the processor is further configured to:

Among the symbols occupied by the control channel in the frequency domain resources of the downlink channel, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform for transmission; or

In the frequency domain resources of the downlink channel, the control channel and the data channel are time-domain multiplexed among the symbols occupied by the control channel, and the symbols occupied by the data channel are used for multiple users. The data signal is time-domain multiplexed, and the time-domain multiplexed signal is subjected to discrete Fourier transform and then transmitted.
The communication device according to claim 43, wherein the processor is specifically configured to:

According to the symbols occupied by the control channel, the control information that needs to be transmitted on the control channel is continuously mapped in the time domain, and the unoccupied position of the signal sample corresponding to the control channel obtained after continuous mapping in the time domain will be required Time-domain mapping is performed on the information transmitted on the data channel to obtain time-domain signal samples of the control channel and the data channel;

Performing discrete Fourier transform on time domain signal samples of the control channel and the data channel to obtain frequency domain signal samples of the control signal and the data channel;

According to the bandwidth of the control channel and the data channel, the frequency domain signal samples of the control channel and the data channel are subjected to frequency domain mapping.
The communication device according to claim 44, wherein the processor is further configured to:

After obtaining the time-domain signal samples of the control channel and the data channel, if the bandwidth of the data channel is less than the specified bandwidth, the network device will perform the processing in the data channel according to the bandwidth of the data channel and the specified bandwidth. Time-domain signal samples of the control channel and the data channel are filled with time-domain samples of the redundant signal;

The processor is specifically configured to: uniformly perform discrete Fourier transform on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.
A communication device, characterized by comprising: a processor, a memory, and a transceiver; the processor is used to read computer instructions in the memory and execute:

Obtain frequency domain resource allocation information of the downlink channel;

Obtaining information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel;

Wherein, the frequency domain resource allocation information includes bandwidth and/or frequency domain resource location, the downlink channel includes a downlink data channel and/or a downlink control channel; the control channel occupied by the frequency domain resources of the downlink channel Among the symbols, the control channel and the data channel are first time-domain multiplexed and then subjected to discrete Fourier transform and then transmitted; or in the frequency domain resources of the downlink channel, in the symbols occupied by the control channel , The control channel and the data channel are time-domain multiplexed, among the symbols occupied by the data channel, the data signals of multiple users are time-domain multiplexed, and then the time-domain multiplexed signal is subjected to discrete Fourier After the inner leaf is transformed, it is transmitted.
The communication device according to claim 46, wherein the processor is specifically configured to:

Transform the information received on the downlink channel in the bandwidth from the frequency domain to the time domain according to the bandwidth position of the downlink channel to obtain the time domain samples of the downlink channel;

Perform blind detection at a specified position in the time domain sample to obtain control information transmitted on the control channel, where the control information includes the resource position of the data channel before time domain to frequency domain conversion;

According to the resource position of the data channel before the time domain to frequency domain conversion, the information transmitted on the data channel is obtained from the time domain samples of the downlink channel.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute any one of claims 1-7. The method described.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute any one of claims 8-14 The method described.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute any one of claims 15-19 The method described.
A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute the method according to claim 20 or 21.