CN111565458B

CN111565458B - Downlink transmission method and device thereof

Info

Publication number: CN111565458B
Application number: CN201910115173.0A
Authority: CN
Inventors: 缪德山; 孙韶辉; 康绍莉
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-02-14
Filing date: 2019-02-14
Publication date: 2022-11-08
Anticipated expiration: 2039-02-14
Also published as: CN111565458A; WO2020164461A1

Abstract

The application discloses a downlink transmission method and a device thereof. In the application, a terminal receives a downlink reference signal and obtains frequency domain resource allocation information of a downlink channel according to a sequence and/or a frequency domain position of the downlink reference signal, or the terminal receives information transmitted on a dedicated channel and obtains frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel; 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 the terminal acquires the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

Description

Downlink transmission method and device thereof

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a downlink transmission method and an apparatus thereof.

Background

In satellite communications, due to the Peak-to-Average Power Ratio (PAPR) limitation, DFT-S-OFDM (Discrete Fourier Transform; OFDM: orthogonal Frequency Division Multiplexing) waveforms are used for downlink transmission, and only one DFT Transform is used within the total transmission bandwidth of a plurality of users. Considering that the downlink transmission is that a plurality of users share time-frequency resources, a Physical Downlink Shared Channel (PDSCH) and a Physical Downlink Control Channel (PDCCH) of the plurality of users are transmitted simultaneously. Herein, the PDSCH may be used for transmitting user data, referred to as a data channel, and the PDCCH may be used for transmitting control information, referred to as a control channel.

When performing signal transmission 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 actually occupied subcarriers, which requires that the terminal knows the bandwidth (i.e., the number of subcarriers) occupied by the transmission signal in advance. Therefore, how to indicate the bandwidth of the transmitting end to the receiving end is a problem that needs to be solved at present.

Disclosure of Invention

The application provides a downlink transmission method and a device thereof, which are used for indicating frequency domain resource allocation information of 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 a frequency domain position 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 the information transmitted on the dedicated channel; 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 the terminal acquires 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 obtaining, by the terminal according to the frequency domain position of the downlink reference signal, frequency domain resource allocation information of a downlink channel includes: and the terminal acquires the frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal according to the subcarrier position occupied by the downlink reference signal.

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

In a possible implementation manner, the obtaining, by the terminal, frequency domain resource allocation information of a downlink channel according to the sequence of the downlink reference signal includes: the terminal obtains frequency domain resource allocation information of a downlink channel according to an initial generation function of the sequence of the downlink reference signal, wherein the initial generation function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel; or, the terminal obtains the frequency domain resource allocation information of the downlink channel according to a bit at a specified position in the sequence of the downlink reference signal, where the bit at the specified 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 manner, the obtaining, by the terminal, frequency domain resource allocation information of a downlink channel according to the information transmitted on the dedicated channel includes: and the terminal acquires 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.

In a possible implementation manner, in a symbol occupied by the control channel in the frequency domain resource of the downlink channel, the control channel and the data channel are transmitted after performing time domain multiplexing and then performing discrete fourier transform; or, in the frequency domain resource of the downlink channel, in the symbol occupied by the control channel, the control channel and the data channel are subjected to time domain multiplexing, in the symbol occupied by the data channel, the data signals of a plurality of users are subjected to time domain multiplexing, and then the signals subjected to time domain multiplexing are subjected to discrete fourier transform and then transmitted.

In a possible implementation manner, the obtaining, by the terminal, information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel includes: the terminal carries out frequency domain to time domain conversion on the information received on the downlink channel in the bandwidth according to the bandwidth position of the downlink channel to obtain a time domain sample value of the downlink channel; the terminal carries out blind detection at the designated position in the time domain sample value to obtain the control information transmitted on the control channel, wherein the control information comprises the resource position of the data channel before the time domain is transformed into the frequency domain; and the terminal acquires the information transmitted on the data channel in the time domain sample value of the downlink channel according to the resource position of the data channel before the time domain-frequency domain conversion.

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

the network equipment generates a downlink reference signal, wherein the sequence and/or the frequency domain position of the downlink reference signal indicate the frequency domain resource allocation information of a downlink channel, the frequency domain resource allocation information comprises bandwidth and/or the frequency domain resource position, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and the network equipment sends the downlink reference signal.

In a possible implementation manner, the indicating, by the frequency domain position of the downlink reference signal, frequency domain resource allocation information of a downlink channel includes: the position of a subcarrier occupied by the downlink reference signal indicates the frequency domain resource allocation information of a downlink channel; and 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 manner, the indicating, by the sequence of the downlink reference signal, frequency domain resource allocation information of a downlink channel includes: the initial generating function of the sequence of the downlink reference signal indicates frequency domain resource allocation information of a downlink channel, wherein the initial generating function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the initial generating function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel; or, a bit at a specified position in the sequence of the downlink reference signal indicates an index of the frequency domain resource allocation information of the downlink channel.

In one possible implementation manner, the method further includes: the network equipment firstly performs time domain multiplexing on the control channel and the data channel in a symbol occupied by the control channel in the frequency domain resource of the downlink channel, and then performs discrete Fourier transform on the control channel and the data channel for transmission; or, in the frequency domain resource of the downlink channel, time-domain multiplexing is performed on the control channel and the data channel in the symbol occupied by the control channel, time-domain multiplexing is performed on the data signals of a plurality of users in the symbol occupied by the data channel, and then discrete fourier transform is performed on the time-domain multiplexed signals for transmission.

Further, the network device performs time domain multiplexing on the control channel and the data channel in a symbol occupied by the control channel in the frequency domain resource of the downlink channel, and then performs discrete fourier transform on the control channel and the data channel, and then performs transmission, including: the network equipment carries out time domain continuous mapping on control information needing to be transmitted on the control channel according to the symbols occupied by the control channel, and carries out time domain mapping on the information needing to be transmitted on the data channel at the position where signal sample values corresponding to the control channel obtained after the time domain continuous mapping are not occupied, so as to obtain the time domain signal sample values of the control channel and the data channel;

the network equipment performs 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 channel and the data channel;

and the network equipment performs frequency domain mapping on the frequency domain signal samples of the control channel and the data channel according to the bandwidths 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: and if the bandwidth of the data channel is smaller than the specified bandwidth, the network equipment fills the time domain sample of the redundant signal in the time domain signal sample of the control channel and the data channel according to the bandwidth of the data channel and the specified bandwidth. The network device performing a discrete fourier transform on time domain signal samples of the control channel and the data channel, comprising: and the network equipment 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.

In a third aspect, a downlink transmission method is provided, including: the network equipment generates information used for sending on a dedicated channel, wherein the information is used for indicating frequency domain resource allocation information of a downlink channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel; the network device transmits the information on the dedicated channel.

In a possible implementation manner, 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; the signal sequence corresponds to the frequency domain resource allocation information of the downlink channel, and the modulation symbol of the dedicated channel corresponds to the frequency domain resource allocation information of the downlink channel.

Further, the network device performs time domain multiplexing on the control channel and the data channel in a symbol occupied by the control channel in the frequency domain resource of the downlink channel, and performs transmission after performing discrete fourier transform, including:

the network equipment carries out time domain continuous mapping on control information needing to be transmitted on the control channel according to the symbols occupied by the control channel, and carries out time domain mapping on the information needing to be transmitted on the data channel at the position where signal sample values corresponding to the control channel obtained after the time domain continuous mapping are not occupied, so as to obtain the time domain signal sample values of the control channel and the data channel;

In a fourth aspect, a terminal is provided, including: a receiving module, configured to receive a downlink reference signal; the processing module is used for obtaining the frequency domain resource allocation information of the downlink channel according to the sequence and/or the frequency domain position of the downlink reference signal; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource position, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and acquiring the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

In a fifth aspect, a terminal is provided, which includes: a receiving module, configured to receive information transmitted on a dedicated channel; the processing module is used for obtaining the frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource position, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and acquiring the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

In a sixth aspect, a network device is provided, comprising: a processing module, configured to generate a downlink reference signal, where a sequence and/or a frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of a downlink channel, where the frequency domain resource allocation information includes a bandwidth and/or a frequency domain resource position, and the downlink channel includes a downlink data channel and/or a downlink control channel; and the sending module is used for sending the downlink reference signal.

In a seventh aspect, a network device is provided, including: a processing module, configured to generate information for sending on a dedicated channel, where the information is used to indicate frequency domain resource allocation information of a downlink channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel; a sending module, configured to send the information on the dedicated channel.

In an eighth aspect, a communication apparatus is provided, including: a processor, memory, transceiver; the processor is configured to read computer instructions in the memory and execute the method according to any one of the above first aspects.

In a ninth aspect, there is provided a communication apparatus comprising: a processor, memory, transceiver; the processor is configured to read the computer instructions in the memory and execute the method according to any one of the second or third aspects.

Generating a downlink reference signal, wherein a sequence and/or a frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of a downlink channel, the frequency domain resource allocation information comprises a bandwidth and/or a frequency domain resource position, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

transmitting, by the transceiver, the downlink reference signal.

In a tenth aspect, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the first aspects above.

In an eleventh aspect, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any one of the second or third aspects described above.

In the above embodiments of the present application, the frequency domain resource allocation information of the downlink channel (the frequency domain resource allocation information includes a bandwidth and/or a frequency domain resource position) is indicated by the downlink reference signal, so that a receiving end (terminal) of the downlink channel can perform data detection according to the frequency domain resource allocation information, and specifically, when performing IDFT transformation, the number of subcarriers occupied by downlink transmitted data can be obtained according to the frequency domain resource allocation information, and then IDFT points are obtained, so as to obtain information transmitted on the downlink channel.

Drawings

Fig. 1 is a schematic flowchart of downlink transmission implemented by a terminal side according to a first embodiment of the present application;

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

fig. 3 is a schematic flowchart of downlink transmission implemented by a network device side according to a first embodiment of the present application;

fig. 4 is a schematic flowchart of downlink transmission implemented by a terminal side according to a second embodiment of the present application;

fig. 5 is a schematic flow chart of downlink transmission implemented by a network device side according to a second embodiment of the present application;

fig. 6 is a schematic diagram of a transmission flow of a downlink channel according to an embodiment of the present application;

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

FIG. 8 is a diagram illustrating filling of redundant signals according to an embodiment of the present application;

fig. 9a and fig. 9b are schematic diagrams of a downlink transmission and reception process provided in an embodiment of the present application;

fig. 10 and fig. 11 are schematic structural diagrams of a terminal according to an embodiment of the present application;

fig. 12 and fig. 13 are schematic structural diagrams of network devices according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a communication device according to another embodiment of the present application.

Detailed Description

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

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

(2) In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.

(3) "and/or" describes the association relationship of the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

(4) The "Terminal" in the embodiment of the present application is a device for providing voice and/or data connectivity to a User, and may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices, unmanned aerial vehicles, or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), mobile Stations (MS), terminals (Terminal Equipment), transmission and reception points (TRP or transmission point, TP), and so on.

(5) The "network device" in the embodiment of the present application is a device for accessing a terminal to a wireless network, and includes but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Home Base Station (e.g., home evolved NodeB, or Home Node B, HNB), a Base Band Unit (BBU), a Wireless Fidelity (WIFI) Access Point (AP), a transmission Point (TRP or transmission Point, TP), a continuously evolved Node B (gNB), a Radio Access Network (RAN) Node, and the like.

In a Long Term Evolution (LTE) system and a 5G NR (new access generation) system, a downlink signal waveform adopts OFDM, data of a plurality of users is transmitted in a frequency division multiplexing manner, transmission of a control channel (such as a PDCCH) and a data channel (such as a PDSCH) also adopts a frequency division multiplexing manner, and different users or different channels are mapped to different Physical Resource Blocks (PRBs). 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 communication, at present, 5G technology is also considered to be adopted for transmission, however, the downlink of the satellite is limited by a satellite power amplifier, and in order to improve the use efficiency of the power amplifier, the downlink usually works in a nonlinear region, so that the waveform of a downlink transmission signal is required to adopt a single carrier waveform. The currently more suitable signal waveform is DFT-S-OFDM, which can maintain better PAPR characteristics. To further reduce the peak-to-average ratio, a DFT transform is applied within the downlink transmission bandwidth. At a transmitting end, the PDSCH and PDCCH of a plurality of users are first time domain multiplexed, then DFT transformed, and then mapped onto a subcarrier, and then Inverse Fast Fourier Transform (IFFT) is performed, the number of IFFT points may exceed the actual number of subcarriers, and the bandwidth is not expanded by padding the subcarriers with 0.

When IDFT conversion is performed, the number of IDFT points is the number of subcarriers actually occupied, which requires that the terminal at the receiving end know the number of subcarriers occupied by the transmission signal in advance. For the number of IFFT points, the number is matched with the sending end. Therefore, bandwidth indication of the transmitted signal is a necessary step, otherwise the terminal cannot perform data detection.

In view of the foregoing problems, embodiments of the present application provide a downlink transmission method and apparatus, which can indicate, to a terminal, 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 can perform data detection according to a bandwidth of a transmission signal.

Specifically, the embodiment of the present application provides the following two schemes:

the first scheme is as follows: indicating the frequency domain resource allocation information of downlink transmission through a reference signal;

scheme II: and indicating the frequency domain resource allocation information of downlink transmission through the information transmitted on the dedicated channel.

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a schematic flow chart of downlink transmission implemented by a terminal side according to a first embodiment of the present application is shown, where as shown in the drawing, the flow may include:

s101: and the terminal receives the downlink reference signal.

The sequence and/or the frequency domain position of the downlink reference signal may indicate frequency domain resource allocation information of a 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 a 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 a frequency domain resource location of the downlink channel, for example, the frequency domain resource location of the downlink channel may be indicated by an index of a subcarrier occupied by the downlink channel or an index of an occupied PRB. And obtaining the bandwidth of the downlink channel according to the frequency domain resource position 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 (CRS), or a common-reference signal (CRS), or another type of reference signal, and when each satellite beam corresponds to a cell, the CRS may also be a 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, which may be system-agreed or pre-configured. The bandwidth of the PDCCH or PDSCH is variable. Fig. 2 exemplarily shows a resource mapping case of CRS, PDCCH, PDSCH. As shown in fig. 2, one slot (slot) contains 14 symbols, and the 14 symbols may be divided into 3 parts, wherein the 1 st symbol is used for transmitting CRS, the 2 nd to 3 rd symbols are used for transmitting PDCCH, and the 4 th to 14 th symbols are used for transmitting PDSCH.

The downlink reference signal usually does not occupy all frequency domain resources within the symbol position occupied by the downlink reference signal. For example, as shown in fig. 2, in the first symbol, the CRS is mapped to only a part of subcarriers in the PRB it occupies. The sub-carriers occupied by the CRS may be pre-agreed or pre-configured by the system.

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

In this step, the terminal may obtain the frequency domain resource allocation information of the downlink channel by using the following three methods (method one, method two, and method three).

The method comprises the following steps: and the terminal acquires the frequency domain resource allocation information of the downlink channel corresponding to the subcarrier position of the downlink reference signal according to the subcarrier position occupied by the downlink reference signal.

The position of the subcarrier occupied by the downlink reference signal and the frequency domain resource allocation information of the downlink channel have a corresponding relationship, for example, the position of the subcarrier occupied by the downlink reference signal and the frequency domain resource allocation information of the downlink channel are in one-to-one correspondence. The corresponding relationship may be predetermined or preconfigured.

The position of the subcarrier occupied by the downlink reference signal can be represented by the number of subcarrier intervals between the subcarriers occupied by the downlink reference signal. Taking the CRS as an example, the CRS occupies the first symbol of a slot in the time domain, and may be transmitted in the frequency domain in an interval manner, that is, there is a certain interval between subcarriers occupied by the CRS, for example, 1 or 2 or 3 subcarriers are transmitted every interval. As shown in fig. 2, the CRS has a subcarrier spacing number of 2 in the frequency domain. Different subcarrier spacing numbers can indicate different downlink channel frequency domain resource allocation information, so that the terminal can obtain the corresponding downlink channel frequency domain resource allocation information according to the subcarrier spacing number of the CRS.

For example, if the number of subcarrier intervals of the CRS is 1, the frequency domain resource allocation information of the corresponding downlink channel is PRB n1 to PRB n2 (n 1 and n2 indicate indexes of PRBs); if the number of subcarrier intervals of the CRS is 2, the frequency domain resource allocation information indicating the downlink channel is PRB n3 to PRB n4 (n 3 and n4 indicate indexes of PRBs).

The position of the sub-carrier occupied by the downlink reference signal can also be represented by a position offset between the sub-carriers occupied by the downlink reference signal. Taking the CRS as an example, the CRS occupies the first symbol of a time slot in the time domain, and may be sent in the frequency domain in an interval manner, that is, there is a certain interval between subcarriers occupied by the CRS, for example, 1 or 2 or 3 subcarriers are sent at each interval. Taking the number of subcarrier intervals as 1 as an example, the subcarrier position index occupied by the CRS may be odd or even within the entire bandwidth occupied by the CRS, which depends on the subcarrier position offset of the CRS. Different subcarrier position offsets can indicate different downlink channel frequency domain resource allocation information, so that the terminal can obtain the corresponding downlink channel frequency domain resource allocation information according to the subcarrier position offset of the CRS.

The second method comprises the following steps: and the terminal acquires the frequency domain resource allocation information of the downlink channel according to the sequence of the downlink reference signal.

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

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

For example, the transmission bandwidth of the downlink channel may be divided into 8 levels, and for each transmission bandwidth level, the corresponding index may be used for identification, as shown in table 1.

Table 1: bandwidth index and corresponding bandwidth size

The BW represents the sending bandwidth, the BWID represents the index of the sending bandwidth, and the value of the BW may be agreed by the system or configured in advance. In table 1, the downlink channel transmission bandwidth may also be 0, that is, no downlink control channel or data channel is transmitted in the current slot (slot).

In the case of CRS using PN sequences, the initial generation function of PN sequences can be calculated from 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)mod2 ³¹

wherein, BWID represents the index of the transmission bandwidth, and its value can be shown in table 1; l represents the position of an OFDM symbol where the CRS is located in a slot (slot); n is _s Indicating an index value of a slot (slot) in which the CRS is located in a radio frame; the NID is used to distinguish between satellite beam index values. The satellite beam index NID here depends on the system configuration and may correspond to or be associated with a range of beam index ID values, and in special cases may also be set to 0.

After the terminal detects the CRS, it may calculate the BWID according to the detected PN sequence and the initialized 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, the terminal may obtain the frequency domain resource allocation information of the downlink channel according to a bit at a specified position in the sequence of the downlink reference signal. Wherein, the bit of the specified position in the sequence of the downlink reference signal is used for indicating the index of the frequency domain resource allocation information of the downlink channel.

Taking CRS as an example, when the frequency domain resource allocation information of the downlink channel is indicated by using a bit at a specified position in the CRS sequence, the bandwidth size and the subcarrier position may be indicated.

For example, taking 5 bits for indication as an example, the last 3 bits in the CRS sequence are used for indicating the bandwidth size, the first 2 bits in the CRS sequence are used for indicating the frequency domain start position, and the 5 bits may be used as an index of the frequency domain resource allocation information of the downlink channel 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 downlink channel and corresponding frequency domain resource allocation information

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

The third method comprises the following steps: the first and second methods may also be used in combination.

For example, the frequency resource of the downlink channel is indicated by using the subcarrier position of the CRS and the sequence joint. As an example, if the index of the frequency domain resource allocation information of the downlink channel is N-bit information, the first K-bit information may be indicated by a subcarrier position of the CRS, and the last (N-K) bit information may be indicated by a sequence of the CRS. Wherein K is greater than 1 and less than N.

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

Optionally, the 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 through the downlink control channel, or may send control information of multiple terminals.

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

Referring to fig. 3, a schematic flow chart of downlink transmission implemented by a network device side according to a first embodiment of the present application is shown, where as shown in the drawing, 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 another type of reference signal. Taking CRS as an example, one possible case of resource mapping of CRS, PDCCH, PDSCH may be as shown in fig. 2.

For the frequency domain resource allocation information of the downlink channel indicated by the frequency domain position of the downlink reference signal, in a possible implementation manner, the frequency domain resource allocation information of the downlink channel may be indicated by using a subcarrier position occupied by the downlink reference signal. And the position of the subcarrier occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel. The subcarrier position occupied by the downlink reference signal at least comprises one of the following: the number of subcarrier intervals between subcarriers occupied by downlink reference signals, and the position offset of subcarriers occupied by downlink reference signals. The specific implementation can be referred to the relevant description in the flow shown in fig. 1.

For the frequency domain resource allocation information of the downlink channel indicated by the sequence of the downlink reference signal, in a possible implementation manner, the frequency domain resource allocation information of the downlink channel may be indicated by using an initial generation function of the sequence of the downlink reference signal. The initial generating function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the initial generating function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel. Reference may be made in particular to the description relating to the flow shown in fig. 1.

For the frequency domain resource allocation information of the downlink channel indicated by the sequence of the downlink reference signal, in another possible implementation manner, the index of the frequency domain resource allocation information of the downlink channel may be indicated by using a bit at a specified position in the sequence of the downlink reference signal. Reference may be made in particular to the description relating to the flow shown in fig. 1.

Alternatively, the frequency domain resource allocation information of the downlink channel may be indicated using the subcarrier position and the sequence joint of the downlink reference signal.

S302: the network equipment transmits the generated downlink reference signal.

As can be seen from the flows shown in fig. 1 and fig. 2, the frequency domain resource allocation information of the downlink channel (the frequency domain resource allocation information includes a bandwidth and/or a frequency domain resource position) is indicated by the downlink reference signal, so that a receiving end (terminal) of the downlink channel can perform data detection according to the frequency domain resource allocation information, and specifically, when performing IDFT transformation, the number of subcarriers occupied by downlink transmitted data can be obtained according to the frequency domain resource allocation information, and then IDFT points are obtained, so as to obtain information transmitted on the downlink channel.

The signal of the transmitting end is subjected to DFT conversion in each TTI, and the minimum granularity of one TTI is one slot (slot), so that the indication of the frequency domain resource allocation information of the downlink channel needs to be indicated in each slot. In the embodiment of the present application, taking the CRS as an example, since the CRS is used to indicate the frequency domain resource allocation information of the downlink channel, and the CRS is transmitted in the first symbol of each timeslot, the frequency domain resource allocation information of the downlink channel can be indicated in each timeslot.

Referring to fig. 4, a schematic diagram of a downlink transmission flow implemented at a terminal side according to a second embodiment of the present application is shown, where the flow may include:

s401: the terminal receives the information transmitted on the dedicated channel.

Wherein, in time domain, the dedicated channel may occupy the same symbol as a reference signal (such as CRS); in the frequency domain, the dedicated channel may occupy subcarriers 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 subcarrier at the position of the blank frame on the CRS symbol in the frequency domain.

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

For example, in some embodiments, a correspondence between a sequence transmitted on the dedicated channel and frequency domain resource allocation information of the downlink channel may be set, and different sequences may correspond to different frequency domain resource allocation information, so that the terminal may obtain the frequency domain resource allocation information of the corresponding downlink channel according to the detected sequence of the dedicated channel.

For another example, in some embodiments, information is transmitted on the dedicated channel using modulated data symbols, and the transmitted information may include an index of frequency-domain resource allocation information of the downlink channel. The transmitted information is sent in a dedicated channel after modulation and mapping. In this way, after the terminal detects the information transmitted on the dedicated channel, the terminal 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.

The downlink channel includes a downlink data channel (e.g., PDSCH), or includes a downlink control channel (e.g., PDCCH), or includes both the downlink data channel and the downlink data channel.

The frequency domain resource allocation information of the downlink channel may include a 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 a frequency domain resource location of the downlink channel, for example, the frequency domain resource location of the downlink channel may be indicated by an index of a subcarrier occupied by the downlink channel or an index of an occupied PRB. And obtaining the bandwidth of the downlink channel according to the frequency domain resource position of the downlink channel. The frequency domain resource allocation information of the downlink channel may also include the bandwidth of the downlink channel and the frequency domain resource location of the downlink channel.

S402: and the terminal acquires the frequency domain resource allocation information of the downlink channel according to the information transmitted on the special channel.

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

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

Referring to fig. 5, a schematic diagram of a downlink transmission flow implemented at a network device side according to a second embodiment of the present application is shown, where the flow may include:

s501: the network device generates information for transmission on the dedicated channel.

The dedicated channel and the information transmitted on the dedicated channel can be referred to the related description in fig. 4. The downlink channel and the frequency domain resource allocation information of the downlink channel can be referred to the related description in fig. 4.

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

S502: the network device transmits the information on the dedicated channel.

As can be seen from the flows shown in fig. 4 and 5, the frequency domain resource allocation information of the downlink channel (the frequency domain resource allocation information includes bandwidth and/or frequency domain resource position) is indicated by the dedicated channel, so that a receiving end (terminal) of the downlink channel can perform data detection according to the frequency domain resource allocation information, and specifically, when performing IDFT transformation, the number of subcarriers occupied by downlink transmitted data can be obtained according to the frequency domain resource allocation information, and then IDFT points are obtained, so as to obtain information transmitted on the downlink channel.

The signal of the sending end is DFT-transformed in each TTI, and the minimum granularity of one TTI is one slot (slot), so that the indication of the frequency domain resource allocation information of the downlink channel needs to be indicated in each slot. In the embodiment of the present application, for example, the dedicated channel and the CRS use frequency division multiplexing transmission, and the dedicated channel and the CRS are transmitted on the same symbol, that is, transmitted on the first symbol of each timeslot, so that the frequency domain resource allocation information of the downlink channel can be indicated in each timeslot.

Another significant problem for the application of the downstream DFT-S-OFDM waveform is the efficiency of use. Since the downlink control channel (such as PDCCH) usually occupies the first few symbols, and the number of downlink control channels of the user is variable, it is wasted to reserve fixed resources for the downlink control channel. In order to improve resource utilization, a downlink control channel (e.g., PDCCH) and a downlink data channel (e.g., PDSCH) may be frequency multiplexed. As shown in fig. 2, in a symbol position occupied by the PDCCH (2 nd to 3 rd symbols), if the PDCCH does not occupy all frequency domain resources, the PDCCH may be multiplexed with the PDSCH. However, due to the application of single carrier waveform DFT-S-OFDM, the mapping of signals must be continuous, so that a variable downlink control channel needs to be mapped with a variable downlink data channel in some combination, and the signal mapping can be guaranteed to be continuous, that is, PAPR characteristics are maintained, and the maximum utilization rate of resources is also maintained.

Considering that the downlink transmission is that a plurality of users share time-frequency resources, downlink data channels and downlink control channels of the plurality of users can be simultaneously sent, and in order to reduce the PAPR, the data channels and the control channels among the users can be firstly multiplexed in the time domain and then mapped 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, the flexibility of detection and the characteristic of single carrier PAPR, the multiplexing of the data channel and the control channel needs to be specially designed to meet the requirements of the system.

For this reason, in some embodiments of the present application, in a symbol occupied by a control channel in a frequency domain resource of a downlink channel, the control channel and a data channel may be subjected to time domain multiplexing and then DFT before transmission. Of course, the data channel may be data of a single user or data of multiple users. In some other embodiments, the control channel and the data channel may be time-domain multiplexed in a symbol occupied by the control channel in the frequency domain resource of the downlink channel, the data signals of multiple users may be time-domain multiplexed in a symbol occupied by the data channel, and the time-domain multiplexed signal may be transmitted after DFT.

Optionally, as shown in fig. 6, in the symbol occupied by the control channel in the frequency domain resource of the downlink channel, the process of performing time domain multiplexing on the control channel and the data channel and then performing DFT on the control channel and the data channel may include:

s601: the network device carries out time domain continuous mapping on the control information which needs to be transmitted on the control channel according to the symbol occupied by the control channel, and carries out time domain mapping on the information which needs to be transmitted on the data channel at the position which is not occupied by the signal sample value corresponding to the control channel obtained after the time domain continuous mapping, so as to obtain the time domain signal sample value of the control channel and the data channel.

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

It should be noted that the above-mentioned allocation of consecutive signal samples of the control channel or the data channel is a relatively simple implementation method, and in an actual system, since the total transmission bandwidth is known in advance at the time of data detection, the time domain samples of the data channel and the control channel may also be mapped non-consecutively.

S602: and the network equipment performs DFT conversion on the time domain signal sample values after multiplexing of the control channel and the data channel to obtain frequency domain signal sample values of the control channel and the data channel.

Wherein, each frequency domain signal sample value after DFT conversion corresponds to a subcarrier.

S603: and the network equipment performs frequency domain mapping on the frequency domain signal samples of the control channel and the data channel according to the bandwidths 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 control channel may include control channels of multiple users, and the control channels of the multiple users are mapped consecutively in a designated area in a time domain symbol area corresponding to the downlink channel. The designated region may be a central region in a time domain symbol region corresponding to a downlink channel.

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

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

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

Based on the flow shown in fig. 6 above, fig. 7 exemplarily shows a frequency division multiplexing diagram of a PDCCH and a PDSCH. As shown in the figure, the control information transmitted on the PDCCH may be continuously mapped at the center of the time domain symbol region 701, and then the information to be transmitted on the PDSCH may be time domain mapped at both sides of the time domain symbol region 702 of the PDCCH; DFT transforms are then performed on the time domain signal samples in the time domain symbol region 702 of the PDCCH and the time domain signal samples in the time domain symbol regions (703a, 703b) of the PDSCH.

Based on the flow shown in fig. 6, at the terminal side, the terminal performs IDFT conversion on the information transmitted on the downlink channel, and then performs blind detection on the control channel at the time delay designated sample position to obtain the position of the data channel in the time domain sample, thereby obtaining the information transmitted on the data channel.

Specifically, the terminal may perform frequency-domain to time-domain conversion (IDFT conversion) on the information received on the downlink channel in the bandwidth according to the bandwidth position of the downlink channel, to obtain a time-domain sample of the downlink channel; then carrying out blind detection at the designated position in the time domain sample value to obtain control information transmitted on a control channel, wherein the control information can comprise the resource position of a data channel before time domain to frequency domain conversion (DFT conversion); and the terminal obtains the information transmitted on the data channel in the time domain sample value of the downlink channel according to the resource position of the data channel before the time domain-frequency domain conversion.

Under the condition that the bandwidth of a downlink channel is large, the data channel after DFT conversion cannot occupy the designated bandwidth, and the designated bandwidth is equal to the bandwidth obtained after the DFT conversion is carried out after the time domain multiplexing of the control channel and the data channel. To this end, in some embodiments of the present application, some redundant signals may be padded on the basis of the flow shown in fig. 6, so that the data channel can occupy a specified bandwidth.

Specifically, based on the flow shown in fig. 6, after the network device obtains the time domain signal samples of the control channel and the data channel, the method further includes the following steps:

and if the network equipment judges that the bandwidth of the data channel is smaller than the designated bandwidth, filling time domain sample values of redundant signals in the time domain signal sample values of the control channel and the data channel according to the bandwidth of the data channel and the designated 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 DFT conversion can be performed on the time domain signal samples of the control channel and the data channel and the time domain samples of the redundant signal.

Fig. 8 exemplarily shows a diagram of DFT transform after filling a redundant signal. As shown, when the PDSCH is time-domain mapped, some redundant symbols are mapped on both sides of the PDSCH, for example, the modulated symbols using data information bit 0. At a receiving end, the terminal can obtain the actual time domain position occupied by the PDSCH through the indication of the PDCCH, and is not affected by the redundant signals. The purpose of the filled redundant symbols is to enable the bandwidth occupied by the transmission signal to be 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 flows shown in fig. 6 and 7 may be used in combination with the first embodiment of the present application, in combination with the second embodiment of the present application, or independently.

In some embodiments combining the flow shown in fig. 6 with the scheme of the embodiment of the present application, as shown in fig. 9a, at a transmitting end, a network device performs constellation mapping 902 on a bit stream 901 to be transmitted, then performs serial/parallel conversion 903, performs FFT conversion 904 on a plurality of converted streams, then sequentially performs mapping 905, ifft conversion 906 on a signal to a subcarrier, adds a cyclic prefix 907, performs parallel/serial conversion 908, and transmits the signal. The bit stream 901 to be transmitted includes a CRS sequence, and the CRS sequence may be used to indicate frequency domain resource allocation information of a downlink channel. The frequency domain resource location of the CRS may also be used to indicate the frequency domain resource allocation information of the downlink channel. In the process of performing the FFT 904, the multiplexing method of the PDCCH and the PDSCH provided in the above embodiments of the present application may be adopted.

As shown in fig. 9b, at the receiving end, the terminal receives the information sent by the network device, removes the cyclic prefix 910, then performs FFT 911, then performs IDFT 912, and finally performs signal detection 913 to obtain the information sent by the network device. When performing 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, the embodiment of the application also provides a terminal. The terminal can implement the functions of the terminal side in the first embodiment.

Referring to fig. 10, a schematic structural diagram of a terminal provided in the embodiment of the present application is shown. As shown, the terminal may include: a receiving module 1001 and a processing module 1002.

A receiving module 1001, configured to receive a downlink reference signal.

A processing module 1002, configured to obtain frequency domain resource allocation information of a downlink channel according to the sequence and/or the frequency domain position of the downlink reference signal; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and acquiring the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

The methods executed by the receiving module 1001 and the processing module 1002 can refer to the related contents in the flow of the terminal side in the first embodiment.

Based on the same technical concept, the embodiment of the application also provides a terminal. The terminal can realize the functions of the terminal side in the second embodiment.

Referring to fig. 11, a schematic structural diagram of a terminal provided in the embodiment of the present application is shown. As shown, the terminal may include: a receiving module 1101 and a processing module 1102.

A receiving module 1101, configured to receive information transmitted on a dedicated channel.

A processing module 1102, configured to obtain frequency domain resource allocation information of a downlink channel according to the information transmitted on the dedicated channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and acquiring the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel.

For the methods executed by the receiving module 1101 and the processing module 1102, reference may be made to related contents in the flow of the terminal side in the second embodiment.

Based on the same technical concept, the embodiment of the application also provides the network equipment. The network device may implement the functions of the network device side in the second embodiment.

Fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown, the network device may include: a processing module 1201 and a sending module 1202.

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

a sending module 1202, configured to send the downlink reference signal.

The methods executed by the processing module 1201 and the sending module 1202 may refer to relevant contents in the flow of the network device in the first embodiment.

Referring to fig. 13, a schematic structural diagram of a network device provided in the embodiment of the present application is shown. As shown, the network device may include: a processing module 1301 and a sending module 1302.

A processing module 1301, configured to generate information for sending on a dedicated channel, where the information is used to indicate frequency domain resource allocation information of a downlink channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

a sending module 1302, configured to send the information on the dedicated channel.

For the methods executed by the processing module 1301 and the sending module 1302, reference may be made to related contents in the process of the network device side in the second embodiment.

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

Referring to fig. 14, a schematic structural diagram of a communication device provided in the embodiment of the present application is shown, and as shown in the drawing, the communication device may include: a processor 1401, a memory 1402, a transceiver 1403, and a bus interface 1404.

The processor 1401 is responsible for managing the bus architecture and general processing, and the memory 1402 may store data used by the processor 1401 in performing operations. The transceiver 1403 is used for receiving and transmitting data under the control of the processor 1401.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1401, and various circuits, represented by memory 1402, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 1401 is responsible for managing the bus architecture and general processing, and the memory 1402 may store data used by the processor 1401 in performing operations.

The processes disclosed in the embodiments of the present invention may be applied to the processor 1401, or may be implemented by the processor 1401. In implementation, the steps of the signal processing flow may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1401. The processor 1401 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, discrete gate or transistor logic, discrete hardware components, and may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1402, and the processor 1401 reads the information in the memory 1402, and completes the steps of the signal processing flow in conjunction with the hardware thereof.

Specifically, the processor 1401 is configured to read the computer instructions in the memory 1402 and execute the functions implemented on the terminal side in the flow shown in fig. 1 or fig. 4.

Based on the same technical concept, the embodiment of the present application further provides a communication device, which may be a network device, such as a base station, and is capable of implementing the function implemented by the network device side in the embodiment of the present application.

Referring to fig. 15, a schematic structural diagram of a communication device provided in the embodiment of the present application is shown, where the communication device may include: a processor 1501, memory 1502, a transceiver 1503, and a bus interface 1504.

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

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1501, and various circuits of memory, represented by memory 1502, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 1501 is responsible for managing a bus architecture and general processing, and the memory 1502 may store data used by the processor 1501 in performing operations.

The processes disclosed in the embodiments of the present invention may be implemented in processor 1501 or in processor 1501. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits in hardware or instructions in software in the processor 1501. 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, discrete gate or transistor logic, discrete hardware components, or the like, that implements or performs the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in a processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. 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 the hardware thereof.

Specifically, the processor 1501 is configured to read the computer instructions in the memory 1502 and execute the functions implemented on the network device side in the flows shown in fig. 3, fig. 5, or fig. 6.

Based on the same technical concept, the embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to execute the processes performed by the terminal side in the embodiments of the present application.

Based on the same technical concept, the embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to perform the processes performed by the network device in the embodiments of the present application.

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

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A downlink transmission method, comprising:

a terminal receives a downlink reference signal and acquires frequency domain resource allocation information of a downlink channel according to a sequence and/or a frequency domain position of the downlink reference signal, or the terminal receives information transmitted on a dedicated channel and acquires the frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

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

the acquiring, by the terminal, frequency domain resource allocation information of a downlink channel according to the frequency domain position of the downlink reference signal includes: 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 subcarrier position occupied by the downlink reference signal;

the terminal obtains the frequency domain resource allocation information of the downlink channel according to the sequence of the downlink reference signal, and the method comprises the following steps: the terminal obtains frequency domain resource allocation information of a downlink channel according to the initial generation function of the sequence of the downlink reference signal; wherein, the initial generating function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel;

the obtaining of the frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel includes: and obtaining 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.

2. The method of claim 1, wherein the position of the sub-carrier occupied by the downlink reference signal comprises at least one of:

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

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

3. The method of claim 1, wherein the downlink control channel and the downlink data channel are transmitted after time-domain multiplexing and discrete fourier transform in a symbol occupied by the downlink control channel in a frequency domain resource of the downlink channel; or

In the frequency domain resource of the downlink channel, in the symbol occupied by the downlink control channel, the downlink control channel and the downlink data channel are subjected to time domain multiplexing, in the symbol occupied by the downlink data channel, the data signals of a plurality of users are subjected to time domain multiplexing, and then the signals subjected to time domain multiplexing are subjected to discrete Fourier transform and then transmitted.

4. The method according to any of claims 1-3, wherein the obtaining, by the terminal, the information transmitted on the downlink channel according to the frequency domain resource allocation information of the downlink channel comprises:

the terminal carries out frequency domain to time domain conversion on the information received on the downlink channel in the bandwidth according to the bandwidth position of the downlink channel to obtain a time domain sample value of the downlink channel;

the terminal carries out blind detection at the designated position in the time domain sample value to obtain the control information transmitted on the downlink control channel, wherein the control information comprises the resource position of the downlink data channel before the time domain is transformed into the frequency domain;

and the terminal acquires the information transmitted on the downlink data channel in the time domain sample value of the downlink channel according to the resource position of the downlink data channel before the time domain-frequency domain conversion.

5. A downlink transmission method, comprising:

the network equipment generates a downlink reference signal, wherein a sequence and/or a frequency domain position of the downlink reference signal indicate frequency domain resource allocation information of a downlink channel, the frequency domain resource allocation information comprises a bandwidth and/or a frequency domain resource position, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

the network equipment sends the downlink reference signal;

wherein, the frequency domain position of the downlink reference signal indicates the frequency domain resource allocation information of the downlink channel, and the method comprises the following steps: the position of a subcarrier occupied by the downlink reference signal indicates the frequency domain resource allocation information of a downlink channel; wherein, the subcarrier position occupied by the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel;

the sequence of the downlink reference signal indicates frequency domain resource allocation information of a downlink channel, and the method comprises the following steps: the initial generating function of the sequence of the downlink reference signal indicates the frequency domain resource allocation information of the downlink channel; the initial generating function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the initial generating function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel.

6. The method of claim 5, wherein the position of the sub-carrier occupied by the downlink reference signal comprises at least one of:

7. The method of claim 5, further comprising:

the network equipment firstly performs time domain multiplexing on the downlink control channel and the downlink data channel in a symbol occupied by the downlink control channel in the frequency domain resource of the downlink channel, and then performs discrete Fourier transform and transmission; or

And in the frequency domain resource of the downlink channel, performing time domain multiplexing on the downlink control channel and the downlink data channel in the symbols occupied by the downlink control channel, performing time domain multiplexing on data signals of a plurality of users in the symbols occupied by the downlink data channel, and performing discrete Fourier transform on the signals subjected to time domain multiplexing and then transmitting the signals.

8. The method of claim 7, wherein the network device performs time-domain multiplexing on the downlink control channel and the downlink data channel in a symbol occupied by the downlink control channel in the frequency-domain resource of the downlink channel, and then performs discrete fourier transform on the downlink control channel and the downlink data channel for transmission, and the method comprises:

the network equipment carries out time domain continuous mapping on the control information needing to be transmitted on the downlink control channel according to the symbol occupied by the downlink control channel, and carries out time domain mapping on the information needing to be transmitted on the downlink data channel at the position where the signal sample value corresponding to the downlink control channel obtained after the time domain continuous mapping is not occupied so as to obtain the time domain signal sample values of the downlink control channel and the downlink data channel;

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

and the network equipment performs frequency domain mapping on the frequency domain signal sample values of the downlink control channel and the downlink data channel according to the bandwidths of the downlink control channel and the downlink data channel.

9. The method of claim 8, wherein obtaining time domain signal samples for said downlink control channel and said downlink data channel further comprises:

if the bandwidth of the downlink data channel is smaller than the designated bandwidth, the network equipment fills the time domain sample values of the redundant signals in the time domain signal sample values of the downlink control channel and the downlink data channel according to the bandwidth of the downlink data channel and the designated bandwidth;

the network device performs discrete fourier transform on the time domain signal samples of the downlink control channel and the downlink data channel, and includes:

and the network equipment uniformly performs discrete Fourier transform on the time domain signal samples of the downlink control channel and the downlink data channel and the time domain samples of the redundant signals.

10. A downlink transmission method, comprising:

the network equipment generates information used for sending on a dedicated channel, wherein the information is used for indicating frequency domain resource allocation information of a downlink channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

the network device transmitting the information on the dedicated channel;

the information sent on the dedicated channel includes a signal sequence transmitted on the dedicated channel or a modulation symbol of the dedicated channel, the signal sequence corresponds to the frequency domain resource allocation information of the downlink channel, and the modulation symbol of the dedicated channel corresponds to the frequency domain resource allocation information of the downlink channel.

11. The method of claim 10, further comprising:

the network equipment firstly performs time domain multiplexing on the downlink control channel and the downlink data channel in a symbol occupied by the downlink control channel in the frequency domain resource of the downlink channel, and then performs discrete Fourier transform and transmission; or alternatively

12. The method of claim 11, wherein the network device performs time domain multiplexing on the downlink control channel and the downlink data channel in a symbol occupied by the downlink control channel in a frequency domain resource of the downlink channel, and performs discrete fourier transform and then transmits the symbol, and the method comprises:

the network equipment performs time domain continuous mapping on control information needing to be transmitted on the downlink control channel according to the symbols occupied by the downlink control channel, and performs time domain mapping on the information needing to be transmitted on the downlink data channel at the position where the signal sample value corresponding to the downlink control channel obtained after the time domain continuous mapping is not occupied, so as to obtain the time domain signal sample values of the downlink control channel and the downlink data channel;

and the network equipment performs frequency domain mapping on the frequency domain signal samples of the downlink control channel and the downlink data channel according to the bandwidths of the downlink control channel and the downlink data channel.

13. The method of claim 12, wherein obtaining time domain signal samples for said downlink control channel and said downlink data channel further comprises:

if the bandwidth of the downlink data channel is smaller than the designated bandwidth, the network equipment fills the time domain sample of the redundant signal in the time domain signal sample of the downlink control channel and the downlink data channel according to the bandwidth of the downlink data channel and the designated bandwidth;

14. A terminal, comprising:

a receiving module, configured to receive a downlink reference signal;

the processing module is used for obtaining the frequency domain resource allocation information of the downlink channel according to the sequence and/or the frequency domain position of the downlink reference signal; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and

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

the obtaining, according to the frequency domain position of the downlink reference signal, frequency domain resource allocation information of a downlink channel includes: acquiring frequency domain resource allocation information of a downlink channel corresponding to the subcarrier position of the downlink reference signal according to the subcarrier position occupied by the downlink reference signal;

the obtaining, according to the sequence of the downlink reference signal, frequency domain resource allocation information of a downlink channel includes: acquiring frequency domain resource allocation information of a downlink channel according to an initial generation function of the sequence of the downlink reference signal; and calculating the initial generation function of the sequence of the downlink reference signal according to the index of the frequency domain resource allocation information of the downlink channel.

15. A terminal, comprising:

a receiving module, configured to receive information transmitted on a dedicated channel, where the information transmitted on the dedicated channel includes a signal sequence transmitted on the dedicated channel or a modulation symbol of the dedicated channel;

a processing module, configured to obtain frequency domain resource allocation information of a downlink 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 comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel; and

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

16. A network device, comprising:

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

a sending module, configured to send the downlink reference signal;

17. A network device, comprising:

a processing module, configured to generate information for sending on a dedicated channel, where the information is used to indicate frequency domain resource allocation information of a downlink channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

a sending module, configured to send the information on the dedicated channel;

18. A communications apparatus, comprising: a processor, memory, transceiver; the processor is used for reading the computer instructions in the memory and executing:

receiving a downlink reference signal through the transceiver, and obtaining frequency domain resource allocation information of a downlink channel according to a sequence and/or a frequency domain position of the downlink reference signal, or receiving information transmitted on a dedicated channel through the transceiver, and obtaining frequency domain resource allocation information of the downlink channel according to the information transmitted on the dedicated channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource position, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

the obtaining of the frequency domain resource allocation information of the downlink channel according to the frequency domain position of the downlink reference signal includes: acquiring frequency domain resource allocation information of a downlink channel corresponding to the subcarrier position of the downlink reference signal according to the subcarrier position occupied by the downlink reference signal;

obtaining the frequency domain resource allocation information of the downlink channel according to the sequence of the downlink reference signal, including: acquiring frequency domain resource allocation information of a downlink channel according to an initial generation function of the sequence of the downlink reference signal; wherein, the initial generating function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel;

19. The communications apparatus as claimed in claim 18, wherein the subcarrier locations occupied by the downlink reference signals include at least one of:

20. The communications apparatus as claimed in claim 19, wherein the downlink control channel and the downlink data channel are transmitted after time-domain multiplexing and then discrete fourier transform in a symbol occupied by the downlink control channel in the frequency domain resource of the downlink channel; or

21. The communication device according to any of claims 18 to 20, wherein the processor is specifically configured to:

according to the bandwidth position of the downlink channel, carrying out frequency domain to time domain conversion on the information received on the downlink channel in the bandwidth to obtain a time domain sample value of the downlink channel;

performing blind detection at a designated position in the time domain sample value to obtain control information transmitted on the downlink control channel, wherein the control information comprises a resource position of the downlink data channel before time domain to frequency domain conversion;

and acquiring the information transmitted on the downlink data channel in the time domain sample value of the downlink data channel according to the resource position of the downlink data channel before the time domain to frequency domain conversion.

22. A communications apparatus, comprising: a processor, memory, transceiver; the processor is used for reading the computer instructions in the memory and executing:

transmitting, by the transceiver, the downlink reference signal;

the sequence of the downlink reference signal indicates frequency domain resource allocation information of a downlink channel, and the method comprises the following steps: an initial generating function of the sequence of the downlink reference signal indicates frequency domain resource allocation information of a downlink channel; the initial generating function of the sequence of the downlink reference signal corresponds to the frequency domain resource allocation information of the downlink channel, and the initial generating function of the sequence of the downlink reference signal is obtained by index calculation according to the frequency domain resource allocation information of the downlink channel.

23. The communications apparatus of claim 22, wherein the subcarrier locations occupied by the downlink reference signals comprise at least one of:

and the position of the subcarrier occupied by the downlink reference signal is deviated.

24. The communications apparatus of claim 23, the processor further configured to:

in the symbols occupied by the downlink control channel in the frequency domain resources of the downlink channel, performing time domain multiplexing on the downlink control channel and the downlink data channel, and performing discrete Fourier transform and then transmitting the downlink control channel and the downlink data channel; or

25. The communications apparatus as claimed in claim 24, wherein the processor is specifically configured to:

according to the symbols occupied by the downlink control channel, performing time domain continuous mapping on control information to be transmitted on the downlink control channel, and performing time domain mapping on the information to be transmitted on the downlink data channel at the position where the signal sample value corresponding to the downlink control channel obtained after the time domain continuous mapping is not occupied to obtain the time domain signal sample values of the downlink control channel and the downlink data channel;

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

and according to the bandwidths of the downlink control channel and the downlink data channel, performing frequency domain mapping on the frequency domain signal sample values of the downlink control channel and the downlink data channel.

26. The communications apparatus of claim 25, wherein the processor is further configured to:

after time domain signal sample values of the downlink control channel and the downlink data channel are obtained, if the bandwidth of the downlink data channel is smaller than the designated bandwidth, filling time domain sample values of redundant signals in the time domain signal sample values of the downlink control channel and the downlink data channel according to the bandwidth of the downlink data channel and the designated bandwidth;

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

27. A communications apparatus, comprising: a processor, memory, transceiver; the processor is used for reading the computer instructions in the memory and executing:

generating information for sending on a dedicated channel, wherein the information is used for indicating frequency domain resource allocation information of a downlink channel; the frequency domain resource allocation information comprises bandwidth and/or frequency domain resource positions, and the downlink channel comprises a downlink data channel and/or a downlink control channel;

transmitting, by the transceiver, the information on the dedicated channel;

28. The communications apparatus of claim 27, wherein the processor is further configured to:

29. The communications apparatus of claim 28, wherein the processor is further configured to:

according to the symbols occupied by the downlink control channel, performing time domain continuous mapping on control information to be transmitted on the downlink control channel, and performing time domain mapping on the information to be transmitted on the downlink data channel at the position where the signal sample value corresponding to the control channel obtained after the time domain continuous mapping is not occupied to obtain the time domain signal sample values of the downlink control channel and the downlink data channel;

and according to the bandwidths of the downlink control channel and the downlink data channel, performing frequency domain mapping on the frequency domain signal samples of the downlink control channel and the downlink data channel.

30. The communications apparatus of claim 29, wherein the processor is further configured to:

31. A computer-readable storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1-4.

32. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 5-9.

33. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 10-13.