WO2020052554A1 - Communication method and communication apparatus - Google Patents

Abstract

Provided are a communication method and a communication apparatus. The communication method comprises: a network device determining the length of a symbol bearing control information of a terminal device, wherein the length of the symbol bearing the control information of the terminal device is one of the lengths of K symbols to be detected, with K being a positive integer; and the network device sending the control information to the terminal device by means of the symbol bearing the control information of the terminal device. According to the technical solution provided in the present application, the network device can flexibly select the length of the symbol bearing the control information of the terminal device.

Description

Communication method and communication device

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on September 14, 2018, with an application number of 201811072868.7, and an application name of "Communication Method and Communication Device", the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of communication, and more particularly, to a communication method and a communication device.

Background technique

In a new air interface (new radio, NR), the typical scheduling mode for network equipment to schedule terminal equipment is time-slot-based frequency division multiplexing scheduling, that is, the physical downlink link channel (PDSCH) of a single terminal equipment is The time domain will occupy one time slot or multiple symbols of one time slot, while in the frequency domain the terminal device will occupy a portion of the available bandwidth. Multiple terminal devices share downlink bandwidth. At this time, in order to schedule multiple terminal devices for frequency division multiplexing, the network device needs to send multiple physical downlink control channels (PDCCH).

In order to resist severe propagation loss, in high frequency bands, beam-based communication is generally used between network equipment and terminal equipment. For the downlink, the number of transmit beams that a network device can maintain simultaneously is limited, and different terminal devices may need to be served by different beams. Therefore, the network device can only send downlink signals to a small number of terminal devices at a time.

As the frequency band increases, the beam that maintains communication should also become narrower. In this case, the possibility that multiple terminal devices are located in the same beam is also lower, so in high frequency bands (for example, above 52.6 GHz), the frequency division multiplexing scenarios of terminal devices will be reduced. If the terminal equipment does not perform frequency division multiplexing, in order to ensure spectrum utilization, the network equipment may allocate the entire bandwidth to the terminal equipment. In high frequency bands, the system bandwidth can reach more than 2GHz. At this time, it is generally difficult for terminal data to occupy the full bandwidth in the frequency domain and the entire time slot in the time domain.

Therefore, under the constraints of high-frequency narrow beams and large bandwidths, full-bandwidth or large-bandwidth time-division scheduling is a typical downlink scheduling method, and the time-domain granularity of scheduling is generally one time slot or less. For example, the time domain granularity may be as low as 1-2 symbols, such as orthogonal frequency division multiplexing (OFDM) symbols, discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-spread OFDM, DFT- s-OFDM) symbols or single-carrier orthogonal amplitude modulation (single carrier-QAM, SC-QAM) symbols, etc., where DFT refers to discrete Fourier transform (DFT).

In order to ensure the downlink transmission rate, the number of symbols occupied by the PDSCH is generally greater than the number of symbols occupied by the PDCCH. Because each symbol can only be transmitted using one beam, the number of beams transmitted by the PDCCH is less than the number of beams transmitted by the PDSCH, which makes network equipment unable to pass. The PDCCH sends scheduling information for all terminal devices scheduled with PDSCH, and schedules terminal devices located in different beams.

Summary of the Invention

The present application provides a communication method and a communication device, and a network device can flexibly select a length of a symbol carrying control information of a terminal device.

According to a first aspect, a communication method is provided. The method includes: a network device determines a length of a symbol carrying control information of a terminal device, and the length of the symbol carrying control information of the terminal device is one of K lengths of symbols to be detected , K is a positive integer; the network device sends the control information to the terminal device through the symbol carrying the control information of the terminal device.

According to the communication method provided in the embodiment of the present application, the network device first determines a length of a symbol carrying control information of the terminal device, and the length of the symbol carrying control information of the terminal device is one of K to-be-detected symbols, and K is Positive integer. That is, the network device can flexibly select the length of the symbol carrying the control information of the terminal device from the length of the plurality of symbols to be detected configured for the terminal device according to the situation of the communication system.

It should be understood that the length of the K to-be-detected symbols configured by the network device for the terminal device may be fixed or randomly configured, or may be configured based on the communication history with the terminal device. This application describes how to configure the network device for the terminal device. The above-mentioned symbols to be detected are not limited. Further, the length of the K to-be-detected symbols may also be prescribed by the protocol.

It should also be understood that the length of at least one of the K to-be-detected symbols is less than the length of the control resource. The length of the control resource indicates a time unit occupied by the control resource in the time domain, and the control resource is a time-frequency resource of the control channel.

That is to say, the network device can determine the time unit occupied by the control resource in the time domain according to the different requirements of the length of the symbol of the control information bearing terminal equipment of the multiple terminal devices served. Control information symbol.

The symbols that carry the control information of the terminal equipment are used to send control information to multiple terminal equipment served by the network equipment, and the network equipment can send control information to multiple terminal equipment through multiple beams, so that the network equipment can transmit to multiple beams located in different beams. Terminal equipment sends control information.

With reference to the first aspect, in some implementations of the first aspect, the network device sends the length information of the K symbols to be detected to the terminal device.

According to the communication method provided in the embodiment of the present application, the network device sends the length information of multiple symbols to be detected to the terminal device, so that the terminal device can correctly analyze the received control information.

It should be understood that when the network device sends the length information of multiple symbols to be detected to the terminal device, the terminal device can judge the actuality of the symbols carrying the control information of the terminal device according to the DCI detection result carried by the symbols carrying the control information of the terminal device. length.

It should also be understood that, because the length of the above-mentioned symbol carrying the control information of the terminal device is one of the lengths of the K to-be-detected symbols, the length information of the K to-be-detected symbols sent by the network device to the terminal device includes the above-mentioned bearer. Information of the length of the symbol of the control information of the terminal device.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, each length information of the length information of the K symbols to be detected includes a numerical value N, and the numerical value N represents a unit of the length of the symbols to be detected N times the length of the symbol, where N is a positive integer.

According to the communication method provided in the embodiment of the present application, the network device sends the length information of the symbol to be detected to the terminal device, which may be used to indicate the length of the symbol carrying the control information of the terminal device. For example, the length of a symbol carrying control information of a terminal device is N times the length of a unit symbol. The premise is that the length of the unit symbol is known to the terminal device. When the terminal device learns that the length of the symbol carrying the control information of the terminal device is N times the length of the unit symbol, the length of the symbol carrying the control information of the terminal device can be calculated according to the multiple relationship.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the length of the unit symbol is a preset value, or the network device sends the length information of the unit symbol to the terminal device.

According to the communication method provided in the embodiment of the present application, the terminal device knows the length of the unit symbol, so the terminal device can calculate the length of the symbol carrying the control information of the terminal device according to the length information of the symbol to be detected.

The length of the unit symbol known to the terminal device may be because the length of the unit symbol is preset, or the terminal device receives the length information of the unit symbol sent by the network device, and determines the unit according to the length information of the unit symbol. The length of the symbol. Provides a flexible determination scheme for the length of the known unit symbol of the terminal device.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a time-domain position of a symbol carrying control information of a terminal device indicates a position of a control channel and / or a data channel of the terminal device.

According to the communication method provided in the embodiment of the present application, a time domain position of a symbol carrying control information of a terminal device can implicitly indicate a position of a control channel and / or a data channel of the terminal device.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the method further includes: the network device sends at least one of the following information to the terminal device: a beam carrying a symbol of control information of the terminal device Information; time-domain information of symbols that carry control information of terminal equipment.

According to the communication method provided in the embodiment of the present application, the network device sends to the terminal device the beam information of the symbol carrying the control information of the terminal device and / or the time domain information of the symbol carrying the control information of the terminal device, so that the terminal device can correctly receive The control information sent by the network device to the terminal device through a symbol carrying the control information of the terminal device.

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the beam information carrying symbols of control information of the terminal device includes at least one of the following information: The demodulation reference signal and the preset reference signal have a spatially quasi-co-located QCL relationship; the symbols carrying the control information of the terminal device have a spatial quasi-co-located QCL relationship.

According to the communication method provided in the embodiment of the present application, the beam information of the symbol that carries the control information of the terminal device sent by the network device to the terminal device may be the symbol that carries the control information of the terminal device and the preset reference signal has a spatially quasi-co-located QCL Relationship, and / or, the demodulation reference signal and the preset reference signal in the symbol of the control information bearing the terminal device have a spatial quasi co-location QCL relationship, so that the terminal device can determine the receiving bearer terminal according to the beam receiving the preset reference signal Beams of symbols for device control information.

It should be understood that the preset reference signal may be a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS).

With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the time domain information of the symbols carrying the control information of the terminal device includes at least one of the following information: the symbols carrying the control information of the terminal device The time domain position of the symbol and the period and offset of the symbol of the control information bearing the terminal device; the time domain start position of the symbol of the control information of the terminal device and the detection of the symbol of the control information of the terminal device Period and offset.

According to the communication method provided in the embodiment of the present application, the time domain information of the symbol carrying the control information of the terminal device sent by the network device to the terminal device is such that the terminal device determines the detection of the symbol carrying the control information of the terminal device based on the time domain information. Time domain location.

In a second aspect, a communication method is provided, including: a terminal device receiving control information sent by a network device by using a symbol carrying control information of the terminal device, wherein the length of the symbol carrying control information of the terminal device is K bytes One of the lengths of the detection symbols, K is a positive integer; the terminal device parses the control information.

According to the communication method provided in the embodiment of the present application, a terminal device may receive control information sent by a network device by using a symbol carrying control information of the terminal device, and parse the control information. And the length of the symbol carrying the control information of the terminal device is one of the lengths of the K symbols to be detected, and the length of the symbol carrying the control information of the terminal device is flexibly selected according to the actual situation of the terminal device.

Further, a length of at least one of the K symbols to be detected is smaller than a length of a control resource of the network device. The length of the control resource indicates a time unit occupied by the control resource in the time domain, and the control resource is a time-frequency resource of the control channel.

That is to say, the network device can determine the time unit occupied by the control resources in the time domain according to the different requirements of the terminal devices serving the length of the control information symbol bearing terminal equipment. Control information symbol.

The symbols that carry the control information of the terminal equipment are used to send control information to multiple terminal equipment served by the network equipment, and the network equipment can send control information to multiple terminal equipment through multiple beams, so multiple terminal equipments can be located in different beams .

With reference to the second aspect, in some implementation manners of the second aspect, the method further includes: the terminal device receiving length information of the K to-be-detected symbols sent by the network device.

According to the communication method provided in the embodiment of the present application, the terminal device may receive length information of multiple symbols to be detected sent by the network device, and the terminal device correctly parses the received control information through the length information.

It should be understood that when the terminal device receives the length information of multiple to-be-detected symbols sent by the network device, the terminal device can determine the symbol carrying the control information of the terminal device according to the DCI detection result carried by the symbol carrying the control information of the terminal device. Actual length.

With reference to the second aspect and the foregoing implementation manners thereof, in another implementation manner of the second aspect, each length information of the length information of the K symbols to be detected includes a value N, and the value N represents the length of the symbols to be detected N times the length of the unit symbol, where N is a positive integer.

According to the communication method provided in the embodiment of the present application, the terminal device receiving the length information of the symbol to be detected sent by the network device may be used to indicate the length of the symbol carrying the control information of the terminal device. For example, the length of a symbol carrying control information of a terminal device is N times the length of a unit symbol. The premise is that the length of the unit symbol is known to the terminal device. When the terminal device learns that the length of the symbol carrying the control information of the terminal device is N times the length of the unit symbol, the length of the symbol carrying the control information of the terminal device can be calculated according to the multiple relationship. .

With reference to the second aspect and the foregoing implementation manners thereof, in another implementation manner of the second aspect, the length of the unit symbol is a preset value, or the terminal device receives the unit symbol sent by the network device. Length information.

According to the communication method provided in the embodiment of the present application, the terminal device knows the length of the unit symbol, so the terminal device can calculate the length of the symbol carrying the control information of the terminal device according to the length information of the symbol to be detected.

The length of the unit symbol known to the terminal device may be because the length of the unit symbol is preset, or the terminal device receives the length information of the unit symbol sent by the network device, and determines the unit according to the length information of the unit symbol. The length of the symbol. Provides a flexible determination scheme for the length of the known unit symbol of the terminal device.

With reference to the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, a time domain position of a symbol carrying control information of a terminal device indicates a position of a control channel and / or a data channel of the terminal device.

According to the communication method provided in the embodiment of the present application, a time domain position of a symbol carrying control information of a terminal device can implicitly indicate a position of a control channel and / or a data channel of the terminal device.

With reference to the second aspect and the foregoing implementation manners thereof, in another implementation manner of the second aspect, the method further includes: receiving, by the terminal device, at least one of the following information sent by the network device: a symbol that carries control information of the terminal device Beam information; time-domain information of symbols carrying control information of terminal equipment.

According to the communication method provided in the embodiment of the present application, the terminal device receives the beam information of the symbol carrying the control information of the terminal device and / or the time domain information of the symbol carrying the control information of the terminal device sent by the network device, so that the terminal device can correctly receive Control information sent to a network device by a network device through a symbol carrying the control information of the terminal device.

With reference to the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the beam information carrying symbols of control information of the terminal device includes at least one of the following information: The demodulation reference signal and the preset reference signal have a spatially quasi-co-located QCL relationship; the symbols carrying the control information of the terminal device have a spatial quasi-co-located QCL relationship.

According to the communication method provided in the embodiment of the present application, the beam information of the terminal device receiving the symbol of the control information of the terminal device sent by the network device may be that the symbol of the control information of the terminal device and the preset reference signal have a spatial quasi co-location QCL Relationship, and / or, the demodulation reference signal and the preset reference signal in the symbol of the control information bearing the terminal device have a spatial quasi co-location QCL relationship, so that the terminal device can determine the receiving bearer terminal according to the beam receiving the preset reference signal Beams of symbols for device control information.

It should be understood that the preset reference signal may be SSB or CSI-RS.

With reference to the second aspect and the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the time domain information of the symbols carrying the control information of the terminal device includes at least one of the following information: the symbols carrying the control information of the terminal device The time domain position of the symbol and the period and offset of the symbol of the control information bearing the terminal device; the time domain start position of the symbol of the control information of the terminal device and the detection of the symbol of the control information of the terminal device Period and offset.

According to the communication method provided in the embodiment of the present application, the terminal device receives the time domain information of the symbol carrying the control information of the terminal device sent by the network device, so that the terminal device determines the detection of the symbol carrying the control information of the terminal device based on the time domain information. Time domain location.

According to a third aspect, a communication device is provided, and the communication device may be used to perform the operations of the first aspect and the network device in any possible implementation manner of the first aspect. Specifically, the communication device includes means corresponding to the steps or functions described in the first aspect, which may be the network device of the first aspect. The steps or functions may be implemented by software, or by hardware, or by a combination of hardware and software.

According to a fourth aspect, a communication device is provided, and the communication device may be used to perform operations of the terminal device in the second aspect and any possible implementation manner of the second aspect. Specifically, the communication device includes means corresponding to the steps or functions described in the above-mentioned second aspect, which may be a terminal device of the second aspect. The steps or functions may be implemented by software, or by hardware, or by a combination of hardware and software.

According to a fifth aspect, a communication device is provided, and the structure of the communication device includes a processor. The processor is configured to support a communication device to perform the functions in the first aspect or the second aspect and various implementations thereof. In a possible design, the communication device may further include a transceiver for supporting the communication device to receive. Or send a message.

In a possible design, the communication device may further include a memory, which is configured to be coupled to the processor, and stores necessary program instructions and data in the communication device.

In other words, the communication device includes a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes the first aspect or the second aspect and each of the foregoing Any one of the communication methods.

According to a sixth aspect, a computer program product is provided. The computer program product includes a computer program (also referred to as code or instructions), and when the computer program is executed, causes a computer to execute the first aspect or the first aspect. The communication method in any one of the two possible implementation manners.

According to a seventh aspect, a computer-readable storage medium is provided, where the computer-readable storage medium stores a program, and the program causes a server in a computer to execute the first aspect or the second aspect and various implementation manners thereof. Either method of communication.

In other words, the computer-readable storage medium is configured to store computer software instructions used by the foregoing server, and includes instructions designed to execute any one of the communication methods in any one of the possible implementation manners of the first aspect or the second aspect. program.

According to an eighth aspect, a chip system is provided. The chip system includes a processor for supporting a server in a computer to implement the functions involved in the first aspect or the second aspect and various implementation manners thereof.

In the communication method and the communication apparatus in the embodiments of the present application, a network device sends control information to a terminal device by using a symbol carrying the control information of the terminal device, and the length of the symbol carrying the control information of the terminal device is K to be detected One of the lengths of the symbols, K is a positive integer, so that the network equipment can flexibly choose the length of the symbols carrying the control information of the terminal equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a communication system according to an example of a communication method and a communication device according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a communication method according to an embodiment of the present application.

FIG. 3 is a schematic diagram of symbols for carrying control information of terminal equipment with different lengths.

FIG. 4 is a schematic diagram of symbols of control information of another type of terminal equipment.

FIG. 5 is another schematic diagram of symbols carrying control information of terminal equipment with different lengths.

FIG. 6 is a schematic diagram of a unit symbol.

FIG. 7 is a schematic diagram of a SC-QAM symbol.

FIG. 8 is a schematic diagram of a symbol carrying control information of a terminal device.

FIG. 9 is a schematic diagram of another type of control information bearing terminal equipment.

FIG. 10 is a schematic diagram of a downlink frame structure.

FIG. 11 is a schematic diagram of another downlink frame structure.

FIG. 12 is a schematic diagram of scheduling.

FIG. 13 is a schematic diagram of a symbol for receiving control information of a terminal device received by the terminal device.

FIG. 14 is a symbol diagram of control information bearing terminal equipment received by another terminal equipment.

FIG. 15 is a schematic diagram of detecting symbols of control information carrying a terminal device.

FIG. 16 is a schematic diagram of sequence transmission and detection.

FIG. 17 is a schematic diagram of a sequence indicating a control channel and a data channel in a symbol carrying control information of a terminal device.

FIG. 18 is a schematic structural diagram of a communication device according to an embodiment of the present application.

FIG. 19 is a schematic structural diagram of a terminal device 20 applicable to the embodiment of the present application.

FIG. 20 is a schematic structural diagram of another communication device according to an embodiment of the present application.

FIG. 21 is a schematic structural diagram of a network device 40 applicable to an embodiment of the present application.

detailed description

The technical solutions in this application will be described below with reference to the drawings.

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a global mobile communication (GSM) system, a code division multiple access (CDMA) system, and a broadband code division multiple access (wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS), Global Interoperability for Microwave Access (WiMAX) communication system, 5th generation in the future, 5G) system or new radio (NR).

The terminal device in the embodiment of the present application may refer to user equipment, access terminal, user unit, user station, mobile station, mobile station, relay station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user Agent or user device. Terminal equipment can also be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), and wireless communications Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or public land mobile network (PLMN) in future evolution Terminal equipment and the like are not limited in this embodiment of the present application.

The network device in the embodiment of the present application may be a device for communicating with a terminal device, and the network device may be a Global System for Mobile Communication (GSM) system or a Code Division Multiple Access (CDMA) system. The network equipment (Base Transceiver Station (BTS)) can also be a base station (NodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolved base station (LTE) in an LTE system ( (evolved NodeB, eNB, or eNodeB), or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and The network equipment in the future 5G network or the network equipment in the future evolved PLMN network is not limited in the embodiments of the present application.

In the embodiment of the present application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. This hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. This application layer contains applications such as browsers, address books, word processing software, and instant messaging software. In addition, the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide according to the embodiment of the application. The communication may be performed by using the method described above. For example, the method execution subject provided in the embodiments of the present application may be a terminal device or a network device, or a function module in the terminal device or the network device that can call a program and execute the program.

In addition, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (eg, hard disks, floppy disks or magnetic tapes, etc.), optical disks (eg, compact discs (CDs), digital versatile discs (DVDs) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media used to store information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instruction (s) and / or data.

FIG. 1 is a schematic diagram of a system 100 capable of applying a communication method according to an embodiment of the present application.

As shown in FIG. 1, the system 100 includes a network device 102, and the network device 102 may include one antenna or multiple antennas. For example, antennas 104, 106, 108, 110, 112, and 114. In addition, the network device 102 may additionally include a transmitter chain and a receiver chain.

Those of ordinary skill in the art can understand that both the transmitter chain and the receiver chain can include multiple components related to signal transmission and reception (for example, a processor, a modulator, a multiplexer, a demodulator, a demultiplexer, or Antenna, etc.).

The network device 102 may communicate with terminal devices (for example, the terminal device 116 and the terminal device 122 shown in FIG. 1). However, it is understood that the network device 102 may communicate with any number of terminal devices similar to the terminal device 116 or the terminal device 122. The terminal devices 116 and 122 may be various devices that communicate with the network device 102. For example, the terminal device 116 may be a cell phone, a smart phone, a portable computer, a handheld communication device, a handheld computing device, a satellite radio, a global positioning system, a PDA And / or any other suitable device for communicating on the wireless communication system 100.

As shown in FIG. 1, the terminal device 116 is in communication with the antennas 112 and 114. Among them, the antennas 112 and 114 send information to the terminal device 116 through a forward link (also referred to as a downlink) 118 and receive information from the terminal device 116 through a reverse link (also referred to as an uplink) 120.

In addition, the terminal device 122 is in communication with the antennas 104 and 106. Among them, the antennas 104 and 106 send information to the terminal device 122 through the forward link 124, and receive information from the terminal device 122 through the reverse link 126.

For example, in a frequency division duplex (FDD) system. For example, forward link 118 may use a different frequency band from reverse link 120, and forward link 124 may use a different frequency band from reverse link 126.

For another example, in a time division duplex (TDD) system and a full duplex system, the forward link 118 and the reverse link 120 may use a common frequency band, and the forward link 124 and the reverse link The link 126 may use a common frequency band.

Each antenna (or antenna group consisting of multiple antennas) and / or area designed for communication is called a sector of the network device 102.

For example, the antenna group may be designed to communicate with terminal devices in a sector covered by the network device 102. A network device can send signals to all terminal devices in its corresponding sector through a single antenna or multiple antenna transmit diversity. In the process that the network device 102 communicates with the terminal devices 116 and 122 through the forward links 118 and 124, respectively, the transmitting antenna of the network device 102 can also use beamforming to improve the signal-to-noise ratio of the forward links 118 and 124.

In addition, compared to the way in which a network device sends signals to all of its terminal devices through a single antenna or multiple antenna transmit diversity, when the network device 102 uses beamforming to send signals to terminal devices 116 and 122 randomly dispersed in the relevant coverage area, Mobile devices in neighboring cells experience less interference.

At a given time, the network device 102, the terminal device 116, or the terminal device 122 may be a wireless communication transmitting apparatus and / or a wireless communication receiving apparatus. When transmitting data, the wireless communication transmitting device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (for example, generate, receive from another communication device, or save in a memory, etc.) a certain number of data bits to be transmitted to the wireless communication receiving device through a channel. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to generate multiple code blocks.

In addition, the communication system 100 may be a PLMN network, a D2D network, an M2M network, an IoT network, or other networks. FIG. 1 is only a simplified schematic diagram of an example. The network may also include other network devices, which are not shown in FIG.

It should be understood that FIG. 1 is only a simple schematic diagram for describing a scenario in which the communication method provided in the embodiment of the present application is applicable, and it cannot constitute any limitation on the present application.

In the following, in order to facilitate the understanding of the communication method provided in the embodiments of the present application, a few basic concepts are introduced first.

1. Waveform and time division scheduling:

In a new air interface (new radio, NR), the downlink (downlink (DL)) in the frequency band below 52.6GHz uses orthogonal frequency division multiplexing (OFDM) waveforms; the uplink (uplink, UL) uses OFDM and discrete Fourier transform to extend orthogonal frequency division multiplexing (DFT, spread-spectrum OFDM (DFT-s-OFDM)). Among them, DFT refers to discrete Fourier transform (DFT). .

The above OFDM waveform has the advantages of flexible frequency division multiplexing, good compatibility with multiple input multiple output (MIMO) technology, and good link performance under frequency selective channels. However, the OFDM waveform has a large peak-to-average power ratio (PAPR) and needs to work in the linear range of the power amplifier.

The frequency selective channel refers to a frequency selective channel.

Specifically, the frequency selection channel refers to a multipath channel, and the inverse of the delay spread is not much larger than the expected signal bandwidth. The frequency response of this channel is uneven in the frequency band used.

Specifically, the reason why the above-mentioned OFDM waveform needs to work in the linear interval of the power amplifier is:

OFDM symbols are formed by superimposing a plurality of independently modulated subcarrier signals, resulting in a large PAPR.

For the peak-to-average ratio signal, the transmitter needs to use a large power amplifier backoff value so that the signal is located in the linear working area of the power amplifier to avoid excessive signal distortion.

The above DFT-s-OFDM waveform has good compatibility with the OFDM waveform, and the PAPR of the DFT-s-OFDM waveform is significantly lower than the above-mentioned OFDM waveform.

Under the same power amplifier, the DFT-s-OFDM waveform can achieve greater output power than the OFDM waveform. Therefore, DFT-s-OFDM waveform can be used to improve the coverage of the uplink. However, DFT-s-OFDM waveforms perform worse than OFDM on frequency-selective channels.

The above briefly introduces the design and selection principles of the waveforms for uplink or downlink transmission in the frequency band below 52.6GHz in NR.

The following briefly introduces the design and selection principles of waveforms for uplink or downlink transmission in the band above 52.6GHz in NR.

In the frequency band above 52.6GHz, the performance of the power amplifier is worse, and the output power is lower. Therefore, it is more necessary to choose a low PAPR waveform. In this application, a frequency band above 52.6 GHz may also be referred to as a high frequency band.

In addition, in the frequency band above 52.6GHz, due to the use of narrower beams, the frequency selectivity of the channel is weaker. As a result, the performance advantage of the OFDM waveform is reduced.

In summary, in the frequency band above 52.6GHz, the DFT-s-OFDM waveform may be more widely used.

In addition, the remaining single-carrier waveforms may also be applied to bands above 52.6GHz.

For example, the special word discrete Fourier transform extends orthogonal frequency division multiplexing (unique word-DFT-s-OFDM, UW-DFT-s-OFDM) waveforms, and the zero-tailed discrete Fourier transform extends orthogonal frequency division Use (zero tail-DFT-s-OFDM, ZT-DFT-s-OFDM) waveform.

It should be understood that in the frequency band above 52.6GHz, it is also possible to use a single carrier waveform including time domain shaping.

For example, single-carrier quadrature amplitude modulation (Single carrier-QAM, SC-QAM) waveforms, etc., where QAM refers to quadrature amplitude modulation (QAM).

It should be understood that when the communication method provided in the embodiments of the present application is described below, the single-carrier waveform involved may be one or more of the foregoing single-carrier waveforms, or may be other types of single-carrier waveforms. This application is not limited to this.

Further, in order to resist severe propagation loss, beam-based communication is generally used between high-frequency network equipment and terminal equipment.

For the downlink, network equipment can only serve multiple terminal equipment located within the coverage of the same beam at the same time. When the beam is narrow and the number of terminal devices is small, a single beam of a network device may be able to serve only one terminal device. When a terminal device exclusively occupies a beam, in order to avoid waste of resources, the network device should allocate the full bandwidth to this terminal device. Because this terminal device occupies all the frequency domain resources, the time domain resources it occupies are generally limited. That is, the terminal device is suitable for adopting time division scheduling.

2. Beam:

A beam is a communication resource. The beam can be a wide beam, or a narrow beam, or another type of beam.

The beam forming technology may be a beam forming technology or other technical means. The beamforming technology may be specifically a digital beamforming technology, an analog beamforming technology, and a hybrid digital / analog beamforming technology. Different beams can be considered as different resources. The same information or different information can be transmitted through different beams.

Optionally, multiple beams having the same or similar communication characteristics may be considered as one beam. A beam may include one or more antenna ports for transmitting data channels, control channels and sounding signals.

For example, a transmission beam may refer to a distribution of signal strengths formed in different directions in space after a signal is transmitted through an antenna.

The receiving beam may refer to an antenna array that strengthens or weakens the reception distribution of wireless signals in different directions in space.

It can be understood that one or more antenna ports forming a beam can also be regarded as an antenna port set. In the current NR protocol, the beam can be reflected through the antenna port quasi co-location (QCL) relationship, where QCL refers to quasi co-location (QCL).

Specifically, the signals of two co-beams have a QCL relationship with respect to a spatial domain Rx parameter. That is, QCL-TypeD: {Spatial Rx parameter in the existing protocol}.

The identification of the beam in the protocol can be the identification of various signals.

For example, the beam identifier may be a resource identification (ID) of a channel state indication-reference signal (CSI-RS); the beam identifier may also be a synchronization signal / physical broadcast channel. (SS / PBCH) time-domain index; the beam identifier may also be a resource ID of a sounding reference signal (SRS), or the beam identifier may be a resource ID of a tracking signal (TRS), and the like.

The number of beams used to transmit the PDCCH is less than the number of beams used to transmit the PDSCH. There is a problem when the network device sends control information to multiple terminal devices located in different beams.

In order to solve the above problem, the present application proposes a communication method in which a network device can flexibly select a length of a symbol carrying control information of a terminal device, thereby achieving more flexible beam switching.

Further, in the case of high-frequency communication, the method of the present application can increase the number of beams transmitted by the network device for control information, so that the network device can time-division multiplex schedule multiple terminal devices located in different beams.

It should be understood that the communication method provided in the embodiment of the present application is applicable to the wireless communication scenario shown in FIG. 1. Specifically, it is applicable to a high-frequency band wireless communication system. The high-frequency band is not limited to the frequency band above 52.6 GHz, but may be all frequency bands based on beam communication.

The communication method provided in the embodiment of the present application is described in detail below with reference to FIGS. 2 to 20.

FIG. 2 is a schematic diagram of a communication method according to an embodiment of the present application. The diagram includes four steps S110-S140. The four steps are described in detail below.

S110. The network device determines a length of a symbol carrying control information of the terminal device.

In the embodiment of the present application, a symbol carrying control information of a terminal device refers to a symbol of a single carrier waveform such as OFDM, DFT-s-OFDM, SC-QAM and the like for carrying control information of the terminal device. The difference between the symbol carrying the control information of the terminal device and the symbol carrying the PDCCH in the prior art is that the length of the symbol carrying the control information of the terminal device in this application can be flexibly selected.

The network device configures one or more control-resource sets (CORESET) for the terminal device. In the prior art, within the one or more control resource sets, a length of a symbol carrying control information of a terminal device is fixed. In this application, the length of a symbol carrying control information of a terminal device in a control resource or a control resource set is variable.

In the embodiment of the present application, the network device needs to determine a length of a symbol carrying control information of the terminal device. The length of the symbol carrying the control information of the terminal device is one of the lengths of the K symbols to be detected, and K is a positive integer.

The length of the K symbols to be detected may be: preset, or configured by a network device.

For example, the network device randomly or fixedly configures the length of the K to-be-detected symbols for the terminal device; or the network device configures the length of the K to-be-detected symbols for the terminal device based on the communication history with the terminal device. The embodiment of the present application does not limit how to configure the length of the K to-be-detected symbols for the terminal device.

Alternatively, the length of the K symbols to be detected is prescribed by the protocol.

In a communication system, different terminal devices may have different requirements for the length of the symbols carrying control information of the terminal device. Factors that affect the length of the symbols carrying control information of the terminal device include: the signal-to-noise ratio of the terminal device and / or the number of information bits of the terminal device. For example, for a terminal device with a high signal-to-noise ratio, the length of the symbol required to carry the control information of the terminal device is shorter; and for a terminal device with a lower signal-to-noise ratio, the length of the symbol required to carry the control information for the terminal device Longer. If the number of information bits of the downlink control information (DCI) of the terminal device is small, the length of the symbols that need to carry the control information of the terminal device is short. The symbol of the control information of the terminal device has a long length.

Optionally, the network device may determine the length of the symbol carrying the control information of the terminal device according to the requirement of the length of the symbol carrying the control information of the terminal device.

That is, the network device determines, based on the number of terminal devices serving each time and the length of the symbol carrying the control information of the terminal device, from the length of the symbols to be detected, a length.

The following describes how a network device determines the length of a symbol carrying control information of a terminal device with reference to FIGS. 3 to 5.

The network device serves X terminal devices, and needs to separately send control information to the X terminal devices. The network device determines the length of the symbol carrying the control information of the terminal device for the X terminal devices according to the requirement of the length of the symbol carrying the control information of the X terminal devices, where X is an integer greater than 1.

FIG. 3 is a schematic diagram of symbols of control information carrying terminal equipment of different lengths.

As shown in FIG. 3, it includes: 8 symbols (symbol A-symbol H as shown in FIG. 3), and the length of each symbol is L.

If X = 8. When the eight terminal devices served by the network equipment have the same requirements for the length of the symbols carrying the terminal equipment control information, the network equipment determines that the lengths of the symbols carrying the eight terminal equipment control information are also the same, which are L.

FIG. 4 is a schematic diagram of another type of symbols carrying control information of a terminal device.

As shown in FIG. 4, it includes: 4 symbols (symbol I-symbol L as shown in FIG. 4). The length of the symbol I is L1, the length of the symbol J is L2, the length of the symbol K is L3, and the length of the symbol L is L4. In addition, L1 = 2 * L4 = 4 * L2 = 4 * L3.

If X = 4. The number of information bits of the DCI of the terminal device A is greater than the number of information bits of the DCI of the terminal device D; the number of information bits of the DCI of the terminal device D is greater than the number of information bits of the DCI of the terminal device B or C. The network equipment determines that the lengths of the symbols carrying the control information of the terminal equipments A, B, C, and D are the lengths of the symbols I, J, K, and L shown in FIG. 7, respectively.

FIG. 5 is another schematic diagram of symbols of control information carrying terminal equipment of different lengths.

As shown in FIG. 5, it includes: 4 symbols (symbol M-symbol P as shown in FIG. 5). It should be understood that the symbols shown in FIG. 5 are symbols that carry control information of the terminal device. The length of the symbol M is L5, the length of the symbol N is L6, the length of the symbol O is L7, and the length of the symbol P is L8. In addition, L5 = 3 * L7; L6 = L8 = 2 * L7. The difference between Figure 5 and Figure 4 is that the symbol length is different.

If X = 4. The number of information bits of the DCI of the terminal device A is greater than the number of information bits of the DCI of the terminal device C; the number of information bits of the DCI of the terminal device B or D is greater than the number of information bits of the DCI of the terminal device C. The network equipment determines the lengths of the symbols carrying the control information of the terminal equipments A, B, C, and D, respectively, as shown in FIG. 8, and the lengths of the symbols M, N, O, and P, respectively.

The network device may configure the length (including the length L, the length L1, and the length L5) of the symbol of the control information of the terminal device A shown in the foregoing FIGS. length. It should be understood that FIG. 3 to FIG. 5 are merely examples and cannot limit the protection scope of the present application.

The length of the symbol carrying the control information of the terminal device may be N times the length of the unit symbol, and N is a positive integer. The network device may determine the length of the symbol carrying the control information of the terminal device based on the length of the unit symbol. The network device determines that the length of the symbol carrying the control information of the terminal device is N times the length of the unit symbol.

The length of the unit symbol is briefly described below with reference to FIG. 6. FIG. 6 is a schematic diagram of a unit symbol. The diagram includes unit symbols 0-unit symbol Y-1. The CP shown in FIG. 6 is a common cyclic prefix (CP) of each unit symbol.

In FIG. 6, the length of the time unit occupied by the control resource in the time domain includes: the length of P preset reference symbols. The P preset reference symbols include Y unit symbols, Y is an integer greater than 1, and P is a positive integer less than or equal to Y. Then, the length of the unit symbol = the length of the P preset reference symbols / Y.

The length of the preset reference symbol is defined by the protocol, or the terminal device is notified by the network device. In a possible implementation, the length of the preset reference symbol is equal to the length of a symbol (for example, a PDSCH symbol) transmitted by the network device to the terminal device.

If P is a positive integer less than Y. The length of the unit symbol is smaller than the length of the preset reference symbol. If P is equal to Y, the length of the unit symbol is smaller than the length of the preset reference symbol.

It should be understood that the values of P and Y can be configured by network equipment or agreed by the agreement, which is not limited in this application.

For example, the time unit occupied by the control resource in the time domain includes 8 unit symbols (as shown in FIG. 3), and the length of the unit symbol is: L _min = 1/8 the length of the time unit occupied by the control resource in the time domain.

The length of the K symbols to be detected can be expressed as a multiple of the length based on the unit symbol. For example, the length of the K to-be-detected symbols configured by the network device for the terminal device A may be the configuration array [1,2, 3, 4, 5, 6, 7, 8], and the values in the array indicate the K to-be-detected symbols, respectively. The length is a multiple of the length L _min of the unit symbol. The situation shown in FIG. 3 is that the network device determines that the length of the symbol carrying the control information of the terminal device A is 1 times the length L _min of the unit symbol. That is, select <1> in the configuration array. The situation shown in FIG. 4 is that the network device determines that the length of the symbol carrying the control information of the terminal device A is four times the length L _min of the unit symbol. That is, select <4> in the configuration array. The situation shown in FIG. 5 is that the network device determines that the length of the symbol carrying the control information of the terminal device A is three times the length L _min of the unit symbol. That is, select <3> in the configuration array.

The symbols carrying the control information of the terminal equipment may be of different types. For example, when the downlink waveform is a DFT-s-OFDM or OFDM waveform, the symbol carrying control information of the terminal device is a DFT-s-OFDM or OFDM symbol. Among them, the DFT-s-OFDM waveform has only one more step of transforming precoding (ie, DFT) than the OFDM waveform. Therefore, the symbols carrying control information of the terminal device under the two waveforms may also be collectively referred to as OFDM symbols. When the downlink adopts the SC-QAM waveform, the symbols carrying the control information of the terminal equipment may be SC-QAM symbols. When other single carrier waveforms are used in the downlink, the symbols carrying the control information of the terminal device may be other types of symbols.

The SC-QAM symbol may include K QAM modulation symbols, where K is a positive integer. The SC-QAM symbol may also include a CP or guard interval (GP) located at the head or tail. As shown in FIG. 7, FIG. 7 is a schematic diagram of a SC-QAM symbol. The QAM modulation in the embodiment of the present application includes π / 2-phase phase shift keying (pi / 2-BPSK), four-phase phase shift keying (QPSK), 16QAM, 64QAM or 256QAM Wait. The QAM modulation in this embodiment may also include other modulation methods such as non-uniform constellation modulation.

When the communication waveform is DFT-s-OFDM, the symbols carrying the control information of the terminal equipment may be defined before DFT. That is, the network device first multiplexes multiple unit symbols shown in FIG. 5 in the time domain, then performs DFT transformation, then performs subcarrier mapping, and finally performs inverse fast Fourier transform (IFFT) and adds CP to generate DFT-s-OFDM symbol.

When the network device sends this DFT-s-OFDM symbol, it can perform beam switching between unit symbols to achieve the purpose that each symbol carrying control information of the terminal device is transmitted using an independent beam.

In FIG. 5, CP is included before each unit symbol, but in practice, GP, UW, etc. can also be inserted between unit symbols. As shown in FIG. 8, when the network device adopts a single carrier waveform and a plurality of unit symbols are allocated to one terminal device, in addition to the first CP, the remaining CPs may be omitted. Therefore, although the symbol carrying the control information of the terminal device may be composed of multiple unit symbols, it can be regarded as an independent symbol.

In another implementation, the CP of each unit symbol is not omitted, and the symbol carrying the control information of the terminal device is composed of multiple independent unit symbols, as shown in FIG. 9.

S120. The network device sends control information to the terminal device.

Specifically, the network device sends the control information to the terminal device through a symbol carrying the control information of the terminal device.

One or more symbols carrying control information of the terminal equipment may be used to carry one control information. For example, X symbols carrying control information of terminal equipment are used to carry Q control information, where Q is a positive integer less than or equal to X. That is, one symbol carrying control information of a terminal device may carry one control information, or a plurality of symbols carrying control information of a terminal device may carry one control information.

The network equipment may use different beams to send symbols carrying control information of the terminal equipment. The network device uses the M first beams to send the X symbols that bear the control information of the terminal device. Wherein, M is a positive integer less than or equal to X. That is, each symbol carrying control information of the terminal device may be transmitted by one beam, and one beam may also transmit multiple symbols carrying control information of the terminal device. The set of beams that transmit the symbols carrying the control information of the terminal equipment may be determined based on the beams where the terminal equipment to be scheduled by the network equipment is located. The terminal equipment to be scheduled can be covered without affecting the efficiency of the terminal equipment. In the embodiment of the present application, the network device may flexibly select the number of beams to transmit symbols carrying control information of the terminal device.

For example, in FIG. 3 to FIG. 5, the network device may send multiple beams in a time unit occupied by the control resource in the time domain, so as to facilitate scheduling of multiple subsequent terminal devices located in different beams. Symbols A to H are included in FIG. 3. Terminal equipment A-terminal equipment H are located in different beams. The network device may send the symbols A to H through the first beam 0 to the first beam 8 respectively. Figure 4 includes symbols I-L. Terminal equipment A-terminal equipment H are located in different beams. The network device may send the symbol I-symbol L through the first beam 0 to the first beam 3, respectively. Figure 5 includes symbols M-symbol P. Terminal device A and terminal device B are located in the same beam, and terminal device C and terminal device D are located in the same beam. The network device may use the first beam 0 to send the symbols M and N, the first beam 1 to send the symbols O and P, and each beam sends two symbols.

The network device may flexibly adopt multiple beams to send multiple symbols bearing control information of the terminal device according to the beam in which the terminal device is located. That is, it is possible to prevent all control information from being transmitted by one wide beam in the prior art, which results in reducing flexibility in selecting a terminal device.

The control information can have the following functions: downlink data channel scheduling, uplink data channel scheduling, power control commands, paging information transmission, and so on. The invention does not limit the function of the control information. However, the following uses the control information for scheduling downlink data channels as an example for description. The Q control information carried by the X symbols carrying the control information of the terminal device is used to schedule Q data channels, wherein the Q data channels are transmitted by Y1 second beams and are scheduled by a plurality of terminals The device can receive the Y1 second beams and M first beams, and the Y1 is a positive integer less than or equal to X. In some implementations, the first beam is the same as the second beam.

The above control resources for sending control information and the data resources corresponding to each data channel are located in a downlink frame structure. The downlink frame structure in the embodiment of the present application is described in detail below with reference to FIGS. 10 and 11.

FIG. 10 is a schematic diagram of a downlink frame structure.

The downlink frame structure includes data resources and control resources. As shown in FIG. 10, the downlink frame includes: data resource 0-data resource 5). The control resources in the frame structure are time-frequency resources used to send control information, such as time-frequency resources of the PDCCH. The data resource is a time-frequency resource for data channel transmission, for example, a PDSCH time-frequency resource. The network device sends scheduling or instruction information at the control resource to instruct the terminal device to receive subsequent one or more data resources.

The time-frequency resource may include one or more OFDM symbols, one or more DFT-S-OFDM symbols, or a group of several modulation symbols (for example, QAM symbols).

Control resources and data resources can be located in the same time unit. Control resources and data resources can also be located in different time units. For example, the control resource is located in time slot 1, the data resource is located in time slot 2, and time slot 1 and time slot 2 are different time slots.

The control resource may be located at the head of the frame structure (for example, a time slot, a symbol, or a time unit, etc.), or may be located at the rest of the frame structure. As shown in FIG. 11, the control resource may be located at a position other than the head of the frame structure of the frame structure.

In order to serve multiple different terminal devices, the network device can send data to the different terminal devices. In a high-frequency wireless communication system, multiple data channels are transmitted through different beams, so network devices can switch beams between data resources.

The following describes multiple control information scheduling multiple data channels with reference to FIG. 12.

FIG. 12 is a schematic diagram of scheduling.

In FIG. 12, the time unit occupied by the control resource in the time domain includes symbols 0 to 5 and the control information carried in the symbols 0 to 5 is used to schedule data channels 0 to 5 respectively. The symbols in FIG. 12 are symbols for carrying control information of the terminal device.

FIG. 12 is an example in which all symbols carrying control information of a terminal device are used for scheduling of a data channel. The symbols carrying the control information of the terminal equipment can also be used to carry the remaining downlink control information, for example, the DCI used to carry the uplink scheduling.

It should be understood that in order to reduce the complexity, the symbols carrying the control information of the terminal equipment may have a narrower bandwidth than the data channel. Because the narrower the bandwidth, the lower the complexity.

The data channels of multiple terminal devices scheduled by the network device can be transmitted through different beams.

For example, the data channels 0 to 5 of the terminal device 0 to the terminal device 5 scheduled by the network device in FIG. 12 are transmitted through the second beam 0 to the second beam 5, respectively.

In order for the terminal device to be able to successfully demodulate the received symbol that carries the control information of the terminal device, the symbol that carries the control information of the terminal device may adopt one of the following two design patterns:

Mode 1: A symbol carrying control information of a terminal device carries a demodulation reference signal (de-modulation reference signal, DMRS), and the DMRS is used to demodulate a symbol carrying control information of a terminal device. Mode 2: The symbols carrying the control information of the terminal equipment adopt differential modulation. The terminal equipment demodulates the symbols carrying the control information of the terminal equipment based on the modulation method of the symbols carrying the control information of the terminal equipment.

In order that the terminal device can correctly receive the symbols carrying the control information of the terminal device, the network device configures the terminal device with at least one of the following information:

(1) beam information of symbols carrying control information of terminal equipment;

(2) Time domain information of symbols carrying control information of terminal equipment.

The beam information carrying the symbols of the control information of the terminal equipment includes at least one of the following information:

(1) The DMRS in the symbol carrying the control information of the terminal equipment and the preset reference signal have a spatial quasi co-location QCL relationship;

(2) The symbol carrying the control information of the terminal device and the preset reference signal have a spatial quasi-co-location QCL relationship.

The terminal device may receive a symbol carrying control information of the terminal device through a beam that receives the preset reference signal.

The preset reference signal may be a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS). That is, the terminal device can receive the symbol carrying the control information of the terminal device through the beam that receives the SSB or CSI-RS.

The time domain information of the symbols carrying the control information of the terminal equipment includes at least one of the following information:

(1) a time-domain position of a symbol carrying control information of a terminal device, and detecting a period and an offset of the symbol carrying control information of the terminal device;

(2) The time domain starting position of the symbol carrying the control information of the terminal equipment, and the period and offset of the symbol carrying the control information of the terminal equipment are detected.

The time domain starting position of the symbol carrying the control information of the terminal equipment refers to the time domain starting position of the symbol carrying the control information of the terminal equipment within a control resource.

Among them, the symbol carrying the control information of the terminal device may have multiple candidate time-domain positions, and the terminal device judges the actual time-domain position of the symbol carrying the control information of the terminal device through blind detection; or The cyclic redundancy code check (cyclic redundancy check, CRC) check result determines the actual time domain position of the symbol carrying the control information of the terminal device.

In addition to configuring the terminal device with the above-mentioned symbol-related information bearing the control information of the terminal device, the network device may also configure other information for the terminal device.

For example, the DMRS sequence information, the power difference between the symbols carrying the control information of the terminal equipment and the remaining reference signals, the bandwidth information, the DCI format to be detected, and the power differences between the symbols carrying the control information of the terminal equipment and the remaining reference signals The bandwidth of the symbol of the control information of the device, and the frequency domain position of the symbol of the control information of the terminal device.

Optionally, the network device sends the length information of the K to-be-detected symbols to the terminal device, and the length information of the K to-be-detected symbols includes information about the length of the symbol carrying the control information of the terminal device. The terminal device determines the actual length of the symbol carrying the control information of the terminal device according to the DCI detection result carried by the symbol carrying the control information of the terminal device. For example, CRC check of DCI is detected, or reference signal received power (RSRP) is used.

Exemplarily, the terminal device determines the actual length of the symbol carrying the control information of the terminal device based on the CRC check result of the DCI obtained by the multiple detections.

Optionally, the length information of the symbols to be detected may be any one of the following two ways.

Method 1: The length information of the symbols to be detected is the actual length of the symbols to be detected.

For example, the length information of the symbol to be detected is the duration of the symbol to be detected.

Method 2: The length information of the symbol to be detected is a multiple of the basic sampling length.

For example, the length information of the symbol to be detected is a numerical value R, and R is a positive integer. It indicates that the actual length of the symbol to be detected is R Tc, Tc is a basic sampling length, and the terminal knows the basic sampling length value Tc.

Method 3: The length information of the symbol to be detected is a multiple of the length of the unit symbol.

For example, the length information of the K symbols to be detected is K numerical values N. Assuming K = 4, the lengths corresponding to the 4 symbols to be detected are 1 times the length of the unit symbol, 2 times the length of the unit symbol, 4 times the length of the unit symbol, and 8 times the length of the unit symbol, respectively. The value N is 1 , 2, 4, 8.

A possible manner of carrying the length information of the symbol of the control information of the terminal device will be described with reference to FIGS. 13 and 14.

When a terminal device requires a length of a symbol carrying control information of the terminal device to be 2 unit symbols in length, the length information of the symbol carrying control information of the terminal device may be implemented in the following two different ways:

Method 1: The length information of the symbol carrying the control information of the terminal device instructs the terminal device to receive 2 unit symbols. As shown in Figure 13.

FIG. 13 is a schematic diagram of a symbol for receiving control information of a terminal device received by the terminal device. The diagram includes 2 unit symbols. The CP shown in FIG. 13 is a CP per unit symbol.

In FIG. 13, the length of the symbol carrying the control information of the terminal device is directly defined by the unit symbol, which has the advantage of simple implementation. Each unit symbol can carry DCI information or DMRS.

Method 2: The length information of the symbol carrying the control information of the terminal equipment instructs the terminal equipment to receive one symbol carrying the control information of the terminal equipment, but the length of the symbol carrying the control information of the terminal equipment is the length of 2 unit symbols. As shown in Figure 14.

FIG. 14 is a symbol diagram of control information bearing terminal equipment received by another terminal equipment. The schematic diagram includes a symbol carrying control information of a terminal device. The CP shown in FIG. 14 is the CP that carries the symbol of the control information of the terminal device. The symbols carrying the control information of the terminal equipment may carry DCI information or DMRS and the like.

FIG. 14 omits the CP of the second unit symbol compared with that shown in FIG. 13, which reduces the overhead.

It should be understood that the foregoing manners 1 and 2 are only two example forms of length information of symbols carrying control information of the terminal device, and other simple variations of the foregoing manners 1 or 2 are used to indicate the symbols carrying control information of the terminal device The indication information of the length is also within the protection scope of the present application.

In a possible implementation manner, a time-domain position of a symbol carrying control information of a terminal device indicates a position of a control channel and / or a data channel of the terminal device.

Exemplarily, the time domain position of the symbol carrying the control information of the terminal device may be represented by a sequence in the symbol carrying the control information of the terminal device, and the sequence may occupy 1 bit in the symbol carrying the control information of the terminal device.

The above sequence can use pi / 2-BPSK modulation to reduce PAPR, or use other low PAPR sequences, such as ZC sequences.

An important difference between the symbols of the control information of the terminal equipment including the sequence and the symbols of the control information of the terminal equipment not including the sequence is the time domain information of the symbols of the control information of the terminal equipment. The network device does not need to configure the terminal device with a sequence of symbols that carry the control information of the terminal device at a specific time domain location of the control resource.

S130: The terminal device receives control information.

Specifically, the terminal device receives the control information sent by the network device by using a symbol carrying the control information of the terminal device.

S140. The terminal device parses the control information.

When the terminal device receives the control information, it first analyzes it, and after the analysis is complete, the data information is processed accordingly. Therefore, when the data information is received, the analysis of the control information may not be completed. The terminal device buffers the received data information in the buffer first, and processes the received data information after the control information is parsed.

The terminal device analyzes the control information according to the configuration information. The configuration information includes the beam information of the symbols carrying the control information of the terminal device, the time domain information of the symbols bearing the control information of the terminal device, or the length information of the K symbols to be detected. I won't repeat them here.

After receiving the configuration information described above, the terminal device may perform symbol detection that carries control information of the terminal device as shown in FIG. 15.

FIG. 15 is a schematic diagram of detecting symbols of control information carrying a terminal device.

First, the terminal device determines a receiving beam that receives a symbol carrying control information of the terminal device according to the configuration information.

Second, the terminal device detects a symbol carrying control information of the terminal device according to the configuration information. For example, detecting the symbol of the control information bearing terminal equipment for the terminal equipment shown in FIG. 15 is detecting a unit symbol. When the symbol of the control information bearing the terminal equipment includes a sequence, the terminal equipment can detect the control information bearing the terminal equipment by The sequence in the symbol determines the specific time domain position of the symbol carrying the control information of the terminal device in the control resource.

The following describes how a terminal device detects a sequence in a symbol carrying control information of the terminal device with reference to FIG. 16.

FIG. 16 is a schematic diagram of sequence transmission and detection.

Assume that the network device schedules six terminal devices from terminal device 0 to terminal device 5.

First, the network devices are the terminal device 0 to the terminal device 5, and respectively determine a symbol 0 carrying control information of the terminal device to a symbol 5 carrying control information of the terminal device.

Secondly, the network device carries the specific time-domain position of the symbol carrying the control information of the terminal device in the control resource in the form of a sequence in the symbol carrying the control information of the terminal device. That is, symbols 0 carrying control information of the terminal device to symbols 5 carrying control information of the terminal device include sequences 0 to 5 respectively.

Finally, the network device specifies, through the configuration information, the beam that the terminal device receives the symbol carrying the control information of the terminal device and the sequence to be detected.

In FIG. 16, the network device specifies the detection sequence 3 of the terminal device 3 through the configuration information.

The time domain position of the symbol carrying the control information of the terminal device can be represented by a sequence in the symbol carrying the control information of the terminal device, and the time domain position of the symbol carrying the control information of the terminal device indicates the control channel of the terminal device and / Or the location of the data channel. Then the sequence in the symbol carrying the control information of the terminal device may also indicate the position of the control channel and / or data channel of the terminal device.

With reference to FIG. 17, it is described how a sequence in a symbol carrying control information of a terminal device represents a position of a control channel and / or a data channel of the terminal device.

FIG. 17 is a schematic diagram of a sequence indicating a position of a control channel and a data channel in a symbol carrying control information of a terminal device.

Sequences 0 to 5 are used to indicate the positions of control channel 0, data channel 0 to control channel 5, and data channel 5, respectively.

The sequence is 1-bit information, and a separate sequence cannot indicate detailed scheduling parameters, so a control channel needs to be transmitted.

Specifically, the symbols carrying control information of the terminal device may include only sequences; or, the symbols carrying control information of the terminal device may include other information, such as DCI information bits, in addition to the sequence.

The data channel may be the PDSCH described above, and the control channel may be the PDCCH described above.

It should be understood that the sequences in FIG. 16 and FIG. 17 can also be directly interpreted as symbols that carry the control information of the terminal equipment, because the sequences are information in the symbols that carry the control information of the terminal equipment.

Wherein, the time domain position of the sequence has a corresponding relationship with the time domain position of the indicated control channel and / or data channel, and the specific correspondence rule is determined according to which correspondence rule is given by the protocol or configured by the network device. Examples are not limited to this. For example, the terminal device uses the same beam to receive the sequence and the control channel and / or data channel indicated by the sequence, that is, the sequence has a QCL relationship with the control channel and / or data channel indicated by the sequence about spatial reception parameters.

The communication method proposed in the present application has been described in detail above with reference to FIGS. 2 to 17. The following describes the communication device proposed in the present application.

Referring to FIG. 18, FIG. 18 is a schematic diagram of a communication device 10 according to the present application. As shown in FIG. 18, the device 10 includes a receiving unit 110 and a processing unit 120.

A receiving unit 110, configured to receive the control information sent by a network device by using a symbol that carries control information of the terminal device;

The processing unit 120 is configured to parse the control information.

The device 10 corresponds exactly to the terminal device in the method embodiment, and the corresponding units of the device 10 are configured to execute the corresponding steps performed by the terminal device in the method embodiments shown in FIG. 2 to FIG. 17.

The receiving unit 110 in the device 10 executes the steps received in the method embodiment. For example, step 130 of receiving control information from a network device in FIG. 2 is performed. The processing unit 120 executes steps implemented or processed in the terminal device in the method embodiment. For example, step 140 of analyzing control information in FIG. 2 is performed.

Optionally, the apparatus 10 may further include a sending unit 130 for sending information to other devices. The receiving unit 110 and the transmitting unit 130 may constitute a transmitting and receiving unit, and have functions of receiving and transmitting at the same time. The processing unit 120 may be a processor. The receiving unit 110 may be a receiver. The transmitting unit 130 may be a transmitter. The receiver and transmitter can be integrated to form a transceiver.

Referring to FIG. 19, FIG. 19 is a schematic structural diagram of a terminal device 20 applicable to an embodiment of the present application. The terminal device 20 can be applied to the system shown in FIG. 1. For ease of explanation, FIG. 19 shows only the main components of the terminal device. As shown in FIG. 19, the terminal device 20 includes a processor, a memory, a control circuit, an antenna, and an input / output device. The processor is used to control the antenna and the input and output devices to send and receive signals. The memory is used to store the computer program. The processor is used to call and run the computer program from the memory to execute the corresponding process performed by the terminal device in the communication method proposed in this application and / Or operation. I won't repeat them here.

Those skilled in the art can understand that, for ease of description, FIG. 19 shows only one memory and a processor. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, which is not limited in the embodiment of the present application.

Referring to FIG. 20, FIG. 20 is a schematic diagram of a communication device 30 proposed in the present application. As shown in FIG. 20, the device 30 includes a sending unit 310 and a processing unit 320.

The processing unit 320 is configured to determine a length of a symbol carrying control information of a terminal device, where the length of the symbol carrying control information of the terminal device is one of K symbols to be detected, and K is a positive integer;

A sending unit 310 is configured to send the control information to the terminal device by using a symbol of the control information bearing the terminal device.

The apparatus 30 corresponds completely to the network device in the method embodiment, and the corresponding units of the apparatus 30 are configured to execute the corresponding steps performed by the network device in the method embodiments shown in FIG. 2 to FIG. 17.

The sending unit 310 in the apparatus 30 performs the steps received by the network device in the method embodiment. For example, step 120 of sending control information to the terminal device in FIG. 2 is performed. The processing unit 120 executes steps implemented or processed internally by the network device in the method embodiment. For example, step 110 of FIG. 2 for determining the length of a symbol carrying control information of a terminal device is performed.

Optionally, the apparatus 30 may further include a receiving unit 330, configured to receive information sent by other devices. The receiving unit 330 and the transmitting unit 310 may constitute a transmitting and receiving unit, and have functions of receiving and transmitting at the same time. The processing unit 320 may be a processor. The transmitting unit 310 may be a receiver. The receiving unit 330 may be a transmitter. The receiver and transmitter can be integrated to form a transceiver.

Referring to FIG. 21, FIG. 21 is a schematic structural diagram of a network device 40 applicable to an embodiment of the present application, and may be used to implement functions of the network device in the foregoing communication method. For example, it can be a structural diagram of a base station. As shown in FIG. 21, the network device can be applied to the system shown in FIG. 1.

The network device 40 may include one or more radio frequency units, such as a remote radio unit (RRU) 401 and one or more base band units (BBU). The baseband unit may also be referred to as a digital unit (DU) 402. The RRU 401 may be referred to as a transceiver unit, and corresponds to the sending unit 310 in FIG. 20. Optionally, the transceiver unit 401 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 4011 and a radio frequency unit 4012. Optionally, the transceiver unit 401 may include a receiving unit and a transmitting unit. The receiving unit may correspond to a receiver (or a receiver or a receiving circuit), and the transmitting unit may correspond to a transmitter (or a transmitter or a transmitting circuit). The RRU 401 part is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for sending control information described in the foregoing embodiment to a terminal device. The BBU 402 part is mainly used for baseband processing and controlling base stations. The RRU 401 and the BBU 402 may be physically located together or physically separated, that is, a distributed base station.

The BBU 402 is a control center of a network device, and may also be referred to as a processing unit, which may correspond to the processing unit 320 in FIG. 20, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spread spectrum. For example, the BBU (Processing Unit) 402 may be used to control the network device 40 to execute the operation procedure about the network device in the foregoing method embodiment, for example, to determine the length of a symbol carrying control information of the terminal device.

In one example, the BBU 402 may be composed of one or more single boards, and multiple single boards may collectively support a single access system wireless access network (such as an LTE system or a 5G system), or may separately support Radio access networks of different access systems. The BBU 402 further includes a memory 4021 and a processor 4022. The memory 4021 is used to store necessary instructions and data. For example, the memory 4021 stores the codebook and the like in the foregoing embodiment. The processor 4022 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment. The memory 4021 and the processor 4022 may serve one or more single boards. That is, the memory and processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.

It should be understood that the network device 40 shown in FIG. 21 can implement the network device functions involved in the method embodiments in FIG. 2 to FIG. 17. The operations and / or functions of each unit in the network device 40 are respectively to implement the corresponding processes performed by the network device in the method embodiment of the present application. To avoid repetition, detailed descriptions are appropriately omitted here. The structure of the network device exemplified in FIG. 21 is only one possible form, and should not be construed in any way in the embodiment of the present application. This application does not exclude the possibility of other forms of network equipment structures that may appear in the future.

An embodiment of the present application further provides a communication system including the foregoing network device and one or more terminal devices.

The present application also provides a computer-readable storage medium. The computer-readable storage medium has instructions stored therein. When the instructions are run on the computer, the computer is caused to execute the network device in the methods shown in FIG. 2 to FIG. 17. Steps performed.

The present application also provides a computer-readable storage medium. The computer-readable storage medium has instructions stored therein. When the instructions are run on the computer, the computer is caused to execute the terminal device in the methods shown in FIG. 2 to FIG. 17. Steps performed.

The present application also provides a computer program product containing instructions. When the computer program product runs on a computer, the computer is caused to execute each step performed by a network device in the methods shown in FIGS. 2 to 17.

This application also provides a computer program product containing instructions. When the computer program product is run on a computer, the computer is caused to execute each step performed by the terminal device in the methods shown in FIGS. 2 to 17.

The present application also provides a chip, including a processor. The processor is configured to read and run a computer program stored in a memory to perform a corresponding operation and / or process performed by a terminal device in the communication method provided in the present application. Optionally, the chip further includes a memory, which is connected to the processor through a circuit or a wire to the memory, and the processor is configured to read and execute a computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is configured to receive data and / or information to be processed, and the processor obtains the data and / or information from the communication interface and processes the data and / or information. The communication interface may be an input-output interface.

The present application also provides a chip, including a processor. The processor is configured to call and run a computer program stored in a memory to perform a corresponding operation and / or process performed by a network device in the communication method provided in the present application. Optionally, the chip further includes a memory, which is connected to the processor through a circuit or a wire to the memory, and the processor is configured to read and execute a computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is configured to receive data and / or information to be processed, and the processor obtains the data and / or information from the communication interface and processes the data and / or information. The communication interface may be an input-output interface.

In the above embodiments, the processor may be a central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more technologies for controlling the present application. Integrated circuit of program execution. For example, the processor may be a digital signal processor device, a microprocessor device, an analog-to-digital converter, a digital-to-analog converter, and the like. The processor may allocate control and signal processing functions of the terminal device or network device among these devices according to their respective functions. In addition, the processor may have a function of operating one or more software programs, and the software programs may be stored in a memory. The functions of the processor may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

The memory can be read-only memory (ROM), other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types of information and instructions that can store Dynamic storage devices can also be electrically erasable programmable read-only memory (EEPROM-ready-only memory (EEPROM)), read-only compact discs (compact disc-read-only memory (CD-ROM)) or other compact disc storage, optical disc storage ( (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or they can be used to carry or store the desired program code in the form of instructions or data structures and Any other media etc. accessed by the computer.

Optionally, the memory and the memory involved in the foregoing embodiments may be physically independent units, or the memory may also be integrated with the processor.

In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship between related objects, and indicates that there can be three kinds of relationships, for example, A and / or B, which can indicate the situation where A exists alone, A and B exist simultaneously, and B exists alone. Where A and B can be singular or plural. The character "/" generally indicates that the related objects are an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c may be single or multiple.

Those of ordinary skill in the art may realize that the units and algorithm steps described in the embodiments disclosed herein can be implemented by a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and are not repeated here.

In several embodiments provided in this application, the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be another division manner in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.

The units described as separate components may not be physically separated, and the components displayed as units may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the technical solution of the present application.

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

If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks or compact discs and other media that can store program codes .

The above description is only the specific implementation of this application. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the protection scope of this application. The protection scope of this application shall be subject to the protection scope of the claims.

Claims (22)

A communication method, comprising: The network device determines a length of a symbol carrying control information of the terminal device, and the length of the symbol carrying control information of the terminal device is one of the lengths of K symbols to be detected, and K is a positive integer; The network device sends the control information to the terminal device through the symbol carrying the control information of the terminal device. The method according to claim 1, further comprising: Sending, by the network device, the length information of the K to-be-detected symbols to the terminal device. The method according to claim 2, wherein each length information of the length information of the K symbols to be detected comprises: A value N, where the value N indicates that the length of the symbol to be detected is N times the length of the unit symbol, and N is a positive integer. The method according to claim 3, wherein the length of the unit symbol is a preset value, or further comprises: The network device sends length information of the unit symbol to the terminal device. The method according to any one of claims 1-4, wherein: The time-domain position of the symbol carrying the control information of the terminal device indicates a position of a control channel and / or a data channel of the terminal device. A communication method, comprising: A terminal device receiving the control information sent by a network device by using a symbol carrying control information of the terminal device, wherein the length of the symbol carrying control information of the terminal device is one of the lengths of K symbols to be detected, K is a positive integer; The terminal device parses the control information. The method according to claim 6, further comprising: Receiving, by the terminal device, length information of the K to-be-detected symbols sent by the network device. The method according to claim 7, wherein each length information of the length information of the K symbols to be detected comprises: A value N, where the value N indicates that the length of the symbol to be detected is N times the length of the unit symbol, and N is a positive integer. The method according to claim 8, wherein the length of the unit symbol is a preset value, or further comprising: Receiving, by the terminal device, length information of the unit symbol sent by the network device. The method according to any one of claims 6-9, characterized in that: The time-domain position of the symbol carrying the control information of the terminal device indicates a position of a control channel and / or a data channel of the terminal device. A communication device, comprising: A processing unit, configured to determine a length of a symbol carrying control information of a terminal device, where the length of a symbol carrying control information of the terminal device is one of K lengths of symbols to be detected, and K is a positive integer; A sending unit, configured to send the control information to the terminal device through the symbol carrying the control information of the terminal device. The apparatus according to claim 11, wherein the sending unit is further configured to send the length information of the K to-be-detected symbols to the terminal device. The apparatus according to claim 12, wherein each of the length information of the K symbols to be detected comprises: A value N, where the value N indicates that the length of the symbol to be detected is N times the length of the unit symbol, and N is a positive integer. The device according to claim 13, wherein the length of the unit symbol is a preset value, or the sending unit is further configured to send the length information of the unit symbol to the terminal device. The device according to any one of claims 11 to 14, wherein: The time-domain position of the symbol carrying the control information of the terminal device indicates a position of a control channel and / or a data channel of the terminal device. A communication device, comprising: A receiving unit, configured to receive the control information sent by a network device by using a symbol that carries control information of the terminal device, The symbol carrying the control information of the terminal device is one of the lengths of the K symbols to be detected, and K is a positive integer; A processing unit, configured to parse the control information. The apparatus according to claim 16, wherein the receiving unit is further configured to receive length information of the K to-be-detected symbols sent by the network device. The device according to claim 17, wherein each length information of the length information of the K symbols to be detected comprises: A value N, where the value N indicates that the length of the symbol to be detected is N times the length of the unit symbol, and N is a positive integer. The apparatus according to claim 18, wherein a length of the unit symbol is a preset value, or the receiving unit is further configured to receive length information of the unit symbol sent by the network device. The device according to any one of claims 11 to 19, wherein: The time-domain position of the symbol carrying the control information of the terminal device indicates a position of a control channel and / or a data channel of the terminal device. A communication device, comprising: Memory for storing computer programs; A processor for executing a computer program stored in the memory, so that the device executes the communication method according to any one of claims 1 to 10. A computer-readable storage medium includes a computer program that, when run on a computer, causes the computer to execute the communication method according to any one of claims 1 to 10.

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