Communication method and device

Abstract

The invention provides a communication method and device, and relates to the field of communication, in the method, under the condition that the sum of the cyclic prefix of a signal and the length of a symbol is not changed, a symbol structure with multiple cyclic prefix lengths exists, for example, the cyclic prefix length of a first symbol structure is not equal to the cyclic prefix length of a second symbol structure, and the sum of the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure. The symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure, so that the cyclic prefix length can be dynamically adjusted under the condition that the subcarrier interval is not changed, and the performance of the device is improved. Therefore, the sensing distance is flexible and adjustable, and various scenes of practical application can be met.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a communication method and device. Background Art

[0002] Harmonized communication and sensing (HCS) is also called communication and sensing integration technology. In the process of the fifth generation mobile communication system (5G) evolving into 5G-advanced (5G-A) technology, communication and sensing integration technology is considered to be one of the key technologies that can expand the service capabilities of mobile communication networks. The core idea of ​​this technology is to add new sensing capabilities to the mobile communication network, build the ability to detect, track and image the target, so that the two capabilities of communication and sensing are integrated into one network.

[0003] Currently, 5G usually uses orthogonal frequency division multiplexing (OFDM) symbols with a cyclic prefix (CP), namely CP-OFDM symbols. When CP-OFDM symbols are used for perception, the perception distance is directly limited by the CP length, which limits practical applications. Summary of the invention

[0004] The embodiments of the present application provide a communication method and device to achieve flexible and adjustable perception distance of CP-OFDM symbols, which can meet various scenarios of practical applications.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, a communication method is provided, the method comprising: receiving indication information from a network device, receiving a first signal from the network device according to the indication information, or sending the first signal to the network device according to the indication information. The indication information is used to indicate a symbol structure of the first signal, the symbol structure comprises a cyclic prefix length and a symbol length, and the symbol structure of the first signal is one of at least two symbol structures, wherein the at least two symbol structures comprise a first symbol structure and a second symbol structure, the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure.

[0007] As can be known, the cyclic prefix length and symbol length of a symbol structure in the prior art are determined, that is, the sum of the lengths of the cyclic prefix and symbol of the signal is determined, and the perception of the signal is also determined. Different from this, the present application defines a symbol structure with multiple cyclic prefix lengths when the sum of the lengths of the cyclic prefix and symbol of the signal remains unchanged, such as the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and symbol length of the second symbol structure. Therefore, it is possible to dynamically adjust the cyclic prefix length while keeping the subcarrier spacing unchanged, so as to achieve flexible and adjustable perception distance, which can meet various scenarios of practical applications.

[0008] It is understood that the symbols mentioned in the embodiments of the present application refer to OFDM symbols or any other possible symbols unless otherwise specified. Since the sum of the length of the cyclic prefix and the symbol of the signal remains unchanged, it can be equal to the length of the CP-OFDM symbol defined in the prior art to be compatible with the existing frame structure without affecting the existing configuration.

[0009] It can also be understood that the method described in the first aspect can be performed by a first communication device, and the first communication device can be a terminal, a device including a terminal, or a chip in a terminal. Alternatively, the first communication device can also be a network device, a device including a network device, or a chip in a network device. For the convenience of description, the following is an example of the method described in the first aspect being performed by the first communication device.

[0010] A possible design scheme, in which the indication information is used to indicate the symbol structure of the first signal, includes: the indication information is used to indicate at least one of the cyclic prefix length of the first signal, the symbol length of the first signal, the ratio of the symbol length of the first signal to the first symbol length, or the ratio of the cyclic prefix length of the first signal to the first cyclic prefix length, which can be flexibly selected according to actual conditions and is not limited to this. Among them, the first symbol length and / or the second cyclic prefix length are predetermined, and can also be called the reference symbol length and / or reference cyclic prefix length, or can also be called the symbol length and / or cyclic prefix length defined by 3GPP, or can also be any other possible naming, which is not limited to this.

[0011] Optionally, in a case where the indication information indicates the ratio of the symbol length of the first signal to the first symbol length, the ratio is one of at least two values, the at least two values ​​being at least two of 1 / 2, 3 / 4, 1 / 4, 7 / 8, 5 / 8, 3 / 8, 1 / 8, 15 / 16, 13 / 16, 11 / 16, 9 / 16, 7 / 16, 5 / 16, 3 / 16 and 1 / 16, or at least two of 1 / 2, 3 / 4, 7 / 8, 5 / 8, 15 / 16, 13 / 16, 11 / 16 and 9 / 16, or at least two of 1 / 2, 3 / 4, 5 / 8, 15 / 16 and 9 / 16.

[0012] It can be understood that, because OFDM symbols are usually generated by fast Fourier transform (FFT), the number of FFT points is usually required to be a power of 2. Considering that the computational complexity of 3 and 5 points in FFT operations is also relatively low, the denominator of the above ratio can be a multiple of 2, or a multiple of a smaller odd number such as 3 or 5, so as to minimize the complexity of signal transmission and reception.

[0013] In a possible design scheme, the indication information is carried in a broadcast message or a unicast message. For example, the broadcast message or the unicast message may have a scheduling relationship with the first signal sent or received by the terminal, so that the terminal can modulate or demodulate the first signal according to the symbol result indicated by the indication information.

[0014] Optionally, if the indication information is carried in the physical broadcast channel PBCH of the broadcast message, the first signal is the physical downlink control channel PDCCH scheduled by the PBCH, so that the terminal can respond to the indication information. Alternatively, if the indication information is carried in the radio resource control RRC message of the unicast message or the media access control-control unit MAC-CE message, the first signal is the channel state information reference signal CSI-RS scheduled by the RRC message or the MAC-CE message; or, if the indication information is carried in the downlink control information DCI message of the unicast message, the first signal is the demodulation reference signal DMRS scheduled by the DCI message. The specific selection can be made according to the actual situation, and there is no limitation on this. In addition, there can be other implementations, and there is no limitation on this.

[0015] In a second aspect, a communication method is provided, the method comprising: a network device sends indication information to a terminal, receives a first signal sent by the terminal, or sends a first signal to the terminal. The indication information is used to indicate a symbol structure of the first signal, the symbol structure includes a cyclic prefix length and a symbol length, and the symbol structure of the first signal is one of at least two symbol structures, wherein the at least two symbol structures include a first symbol structure and a second symbol structure, the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure.

[0016] A possible design scheme, in which indication information is used to indicate a symbol structure of a first signal, includes: indication information is used to indicate at least one of a cyclic prefix length of the first signal, a symbol length of the first signal, a ratio of the symbol length of the first signal to the first symbol length, or a ratio of the cyclic prefix length of the first signal to the first cyclic prefix length, wherein the first symbol length and / or the second cyclic prefix length are predetermined.

[0017] Optionally, in a case where the indication information indicates the ratio of the symbol length of the first signal to the first symbol length, the ratio is one of at least two values, the at least two values ​​being at least two of 1 / 2, 3 / 4, 1 / 4, 7 / 8, 5 / 8, 3 / 8, 1 / 8, 15 / 16, 13 / 16, 11 / 16, 9 / 16, 7 / 16, 5 / 16, 3 / 16 and 1 / 16, or at least two of 1 / 2, 3 / 4, 7 / 8, 5 / 8, 15 / 16, 13 / 16, 11 / 16 and 9 / 16, or at least two of 1 / 2, 3 / 4, 5 / 8, 15 / 16 and 9 / 16.

[0018] In a possible design scheme, the indication information is carried in a broadcast message or a unicast message.

[0019] Optionally, if the indication information is carried in the physical broadcast channel PBCH of the broadcast message, the perception signal is the physical downlink control channel PDCCH scheduled by the PBCH; or, if the indication information is carried in the radio resource control RRC message of the unicast message or the media access control-control unit MAC-CE message, the perception signal is the channel state information reference signal CSI-RS scheduled by the RRC message or the MAC-CE message; or, if the indication information is carried in the downlink control information DCI message of the unicast message, the perception signal is the demodulation reference signal DMRS scheduled by the DCI message.

[0020] A possible design scheme is that when the network device receives the first signal sent by the terminal, the method described in the second aspect also includes: the network device receives an echo signal of the first signal to achieve perception.

[0021] It can be understood that the relevant technical effects of the method described in the above second aspect can also refer to the relevant introduction of the above first aspect, and will not be repeated here.

[0022] In a third aspect, a communication device is provided. The communication device includes: a module for executing the method described in any one of the first aspect to the second aspect, such as a transceiver module and a processing module. For example, the transceiver module is used to indicate the transceiver function of the communication device, and the processing module is used to execute functions of the communication device other than the transceiver function.

[0023] Optionally, the transceiver module may include a sending module and a receiving module, wherein the sending module is used to implement the sending function of the communication device described in the third aspect, and the receiving module is used to implement the receiving function of the communication device described in the Xth aspect.

[0024] Optionally, the communication device described in the third aspect may further include a storage module, wherein the storage module stores a program or instruction. When the processing module executes the program or instruction, the communication device may execute the method described in any one of the first aspect to the second aspect.

[0025] It can be understood that the communication device described in the third aspect can be a terminal or a network device, or a chip (system) or other parts or components that can be set in a terminal or a network device, or a device that includes a terminal or a network device, and this application does not limit this.

[0026] In addition, the technical effects of the communication device described in the third aspect can refer to the technical effects of the other aspects mentioned above, and will not be repeated here.

[0027] According to a fourth aspect, a communication device is provided, wherein the communication device comprises: a processor, wherein the processor is configured to execute the method described in any one of the first aspect to the second aspect.

[0028] In a possible design solution, the communication device described in the fourth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the fourth aspect to communicate with other communication devices.

[0029] In a possible design scheme, the communication device described in the fourth aspect may further include a memory. The memory may be integrated with the processor or may be separately provided. The memory may be used to store the computer program and / or data involved in the method described in any one of the first aspect to the second aspect.

[0030] In an embodiment of the present application, the communication device described in the fourth aspect may be a terminal or network device described in any one of the first to second aspects, or a chip (system) or other parts or components that may be arranged in the terminal or network device, or a device including the terminal or network device.

[0031] In addition, the technical effects of the communication device described in the fourth aspect can refer to the technical effects of the methods described in any one of the first aspect to the second aspect, and will not be repeated here.

[0032] In a fifth aspect, a communication device is provided, comprising: a processor, the processor being coupled to a memory, the processor being configured to execute a computer program stored in the memory, so that the communication device executes the method described in any one of the first aspect to the second aspect.

[0033] In a possible design solution, the communication device described in the fifth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the fifth aspect to communicate with other communication devices.

[0034] In an embodiment of the present application, the communication device described in the fifth aspect may be a terminal or network device described in any one of the first aspect to the second aspect, or a chip (system) or other parts or components that may be arranged in the terminal or network device, or a device including the terminal or network device.

[0035] In addition, the technical effects of the communication device described in the fifth aspect can refer to the technical effects of the methods described in any one of the first aspect to the second aspect, and will not be repeated here.

[0036] In a sixth aspect, a communication device is provided, comprising: a processor and a memory; the memory is used to store a computer program, and when the processor executes the computer program, the communication device executes the method described in any one of the first aspect to the second aspect.

[0037] In a possible design solution, the communication device described in the sixth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be used for the communication device described in the sixth aspect to communicate with other communication devices.

[0038] In an embodiment of the present application, the communication device described in the sixth aspect may be a terminal or network device described in any one of the first aspect to the second aspect, or a chip (system) or other parts or components that may be arranged in the terminal or network device, or a device including the terminal or network device.

[0039] In addition, the technical effects of the communication device described in the sixth aspect can refer to the technical effects of the methods described in any one of the first aspect to the second aspect, and will not be repeated here.

[0040] In a seventh aspect, a communication system is provided, comprising: a first communication device for executing the method described in the first aspect, and a second communication device for executing the method described in the second aspect.

[0041] In an eighth aspect, a computer-readable storage medium is provided, comprising: a computer program or instructions; when the computer program or instructions are executed on a computer, the computer executes the method described in any one of the first aspect to the second aspect.

[0042] In a ninth aspect, a computer program product is provided, comprising a computer program or instructions, which, when executed on a computer, causes the computer to execute the method described in any one of the first to second aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the scene for the perception mode;

[0044] Figure 2 Schematic diagram of the structure of CP-OFDM symbol;

[0045] Figure 3 A schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0046] Figure 4 A flow chart of a communication method provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the structure of a CP-OFDM symbol of a communication method provided in an embodiment of the present application;

[0048] Figure 6 A schematic diagram of the structure of the communication device provided in the embodiment of the present application Figure 1 ;

[0049] Figure 7 A schematic diagram of the structure of the communication device provided in the embodiment of the present application Figure 2 . DETAILED DESCRIPTION

[0050] For ease of understanding, the technical terms involved in the embodiments of the present application are first introduced below.

[0051] 1. Sensing:

[0052] Perception may refer to the communication entity in a wireless network determining information about the surrounding environment by sending and receiving signals after being acted upon by an object. The information about the surrounding environment may include information about one or more objects in the environment. The information about an object may include the position, speed, size, or shape of the object. These objects may change the transmission characteristics of the signal, such as changing the transmission direction of the signal, changing the transmission gain of the signal, changing the transmission delay of the signal, or changing the frequency of the signal, so the communication entity may achieve perception by obtaining changes in the signal transmission characteristics. For example, the channel response information obtained through channel estimation may feedback the changes in the signal after passing through different transmission environments (or channels), and then when the signal passes through the above-mentioned object, the channel response information may feedback the changes in the transmission characteristics of the signal caused by the object.

[0053] Exemplarily, the channel response information may include a channel impulse response (CIR), a channel frequency response (CFR), or channel state information (CSI), etc., which is not specifically limited in the embodiments of the present application.

[0054] It should be understood that the "signal after being affected by an object" mentioned above may include: the signal after being reflected by the object; the signal after being refracted by the object; the signal after being scattered by the object; the signal after being diffracted by the object; or the signal after being transmitted through the object, etc., and the embodiments of the present application do not make specific limitations on this.

[0055] It is understood that the above-mentioned objects can be moving or fixed, and can be active or passive. Active can refer to objects with data processing capabilities, such as base stations, mobile phones, routers, vehicles, drones, wireless radio frequency identification (RFID) devices, etc. Passive can refer to objects without data processing capabilities, such as human bodies, animals, plants, vehicles, buildings, etc.

[0056] It should be understood that an "object" may also be referred to as a "scatterer", "reflector", "refractor", "blocker", or "obstacle", etc. In other words, in the embodiments of the present application, "object", "scatterer", "reflector", "refractor", "blocker", and "obstacle" may be interchangeably expressed, and are described uniformly here, and will not be repeated below.

[0057] It should also be understood that the above-mentioned "communication entity" may also be referred to as a "network entity", "communication device", "communication equipment", "communication node", or "site". In other words, in the embodiments of the present application, "communication entity", "network entity", "communication device", "communication equipment", "communication node" and "site" may be used interchangeably, and will not be described in detail below.

[0058] 2. HCS:

[0059] HCS is also called communication perception integration technology. In the process of 5G evolving into 5G enhanced technology, communication perception integration technology is considered to be one of the key technologies that can expand the service capabilities of mobile communication networks. The core idea of ​​this technology is to add perception capabilities to mobile communication networks and build the ability to detect, track and image targets, so that communication and perception capabilities can be integrated into one network to achieve harmonious coexistence and even mutual benefit.

[0060] The technical principle of perception is somewhat different from that of communication. In communication, the transmitter modulates information on radio waves and sends it to the receiver, which then demodulates the signal carried on the radio waves to obtain the information. However, perception requires the transmitter to send radio waves in a specific direction. When the radio waves hit the surface of the target, reflected radio waves are formed. The receiver then receives and processes the reflected radio waves to obtain information such as the target's location, speed, and type.

[0061] Perception can usually be divided into two types based on the mode: single-station perception and dual-station perception. In single-station perception, the transmitter and receiver of the perception signal are the same device. From the perspective of the perception signal process, the perception site must both send the perception signal and receive the signal reflected by the target surface. Therefore, the single-station perception mode is also called the self-transmitting and self-receiving mode. For dual-station perception, the transmitter and receiver of the perception signal are two different devices. From the perspective of the perception signal process, after the perception site A sends the perception signal, the signal reflected by the target surface is received by the perception site B. Therefore, the dual-station perception mode is also called the A-transmitting and B-receiving mode.

[0062] like Figure 1 As shown, in the current 3GPP SA1 discussion, it has been determined that the perception mode can be divided into the following 6 modes:

[0063] 1) Base station sends and receives signals on its own: The sensing signal is sent by the base station, reflected by the target in the environment, and then the echo signal is received by the base station.

[0064] 2) Base station A sends and base station B receives: The sensing signal is sent by base station A, reflected by the target in the environment, and then the echo signal is received by base station B.

[0065] 3) Base station sends and terminal receives: The sensing signal is sent by the base station, reflected by the target in the environment, and then the echo signal is received by the terminal.

[0066] 4) Terminal sends and base station receives: The sensing signal is sent by the terminal, reflected by the target in the environment, and then the echo signal is received by the base station.

[0067] 5) Terminal self-transmission and self-reception: The sensing signal is sent by the terminal, reflected by the target in the environment, and then the echo signal is received by the terminal.

[0068] 6) Terminal A sends and terminal B receives: The perception signal is sent by terminal A, reflected by the target in the environment, and then the echo signal is received by terminal B.

[0069] 3. Wireless communication:

[0070] In wireless communication systems, communications can be divided into different types according to the types of sending nodes and receiving nodes. Usually, sending information from a network device to a terminal device is called downlink communication, and sending information from a terminal device to a network device is called uplink communication. In long term evolution (LTE) / long term evolution advanced (LTE-A) communication systems and new radio (NR) systems, communications can be mainly divided into frequency division duplex (FDD) mode and time division duplex (TDD) mode according to the different duplex modes. For wireless communication systems operating in TDD mode, the downlink carrier and uplink carrier of the system are carriers of the same carrier frequency. The multiple access method usually adopts the orthogonal frequency division multiple access (OFDMA) method of OFDM. The main feature of OFDMA is that the transmission resources are divided into mutually orthogonal time-frequency resource elements (REs). The signals sent by the transmitter are carried on REs and transmitted to the receiver. Since different REs are orthogonal to each other, the receiver can receive the signals sent on each RE separately.

[0071] 4. OFDM:

[0072] For systems using OFDM waveforms, a CP is usually added before the OFDM symbol to combat the multipath delay of the wireless channel. Figure 2As shown, an OFDM symbol without CP usually includes N sampling points in the digital domain, where N is an integer greater than , denoted by x1, x2, …, xN. The CP usually selects the last M sampling points of the OFDM symbol, such as xN-M+1, xN-M+2, …, xN, and adds these N sampling points to the front of the OFDM symbol to form a CP-OFDM symbol, denoted by xN-M+1, xN-M+2, …, xN, x1, x2, …, xN, with a total of N+M sampling points.

[0073] The length of the CP and OFDM symbol is related to the sub-carrier space (SCS). NR can support multiple sub-carrier spacings, such as 15KHz, 30KHz, 60KHz, 120KHz, 240KHz, 480KHz, and 960KHz. The configuration of the sub-carrier spacing can be expressed as μ, as shown in Table 1.

[0074] Table 1

[0075] μ <![CDATA[Δf=2 μ ·15(kHz)]]> CP Type 0 15 Normal CP 1 30 Conventional CP 2 60 Conventional / Extended CP 3 120 Conventional CP 4 240 Conventional CP 5 480 Conventional CP 6 960 Conventional CP

[0076] On this basis, Indicates the OFDM symbol length, represents the CP length, as shown in the following formula (1)-formula (2):

[0077]

[0078]

[0079] Among them, κ can be 64, It can represent the cyclic shift code length of the extended CP. It can represent the cyclic shift code length of a normal CP, where the normal CP can be the CP of the first symbol in a subframe. It can represent the cyclic shift code length of a regular CP, and the regular CP can be a CP of a non-first symbol in a subframe. Based on the above formula 1-formula 2, some typical CPs and OFDM symbol lengths can be shown in the following table 2:

[0080] Table 2

[0081] Subcarrier spacing (kHz) Symbol length (us) CP length (us) 15 1 / 15*103≈66.7 1 / 15*103*144 / 2048≈4.7 30 1 / 30*103≈33.3 1 / 30*103*144 / 2048≈2.4 60 1 / 60*103≈16.7 1 / 60*103*144 / 2048≈1.2 120 1 / 120*103≈8.33 1 / 120*103*144 / 2048≈0.59

[0082] It can be seen that the CP length in the CP-OFDM symbol is directly related to the subcarrier spacing. Once the subcarrier spacing is determined, the CP length cannot be changed. However, when using CP-OFDM symbols for sensing, the sensing distance is directly limited by the CP length, the detection distance is fixed, and the sensing distance cannot be adaptively changed according to the movement of the sensed target, resulting in limited practical applications.

[0083] In response to the above technical problems, the embodiments of the present application propose the following technical solutions.

[0084] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0085] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as wireless network (Wi-Fi) systems, vehicle to everything (V2X) communication systems, device-to-device (D2D) communication systems, Internet of Vehicles communication systems, fourth generation (4G) mobile communication systems such as LTE systems, worldwide interoperability for microwave access (WiMAX) communication systems, 5G such as NR systems, and future communication systems.

[0086] In the embodiment of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information (such as the first indication information, the second indication information, or the third indication information, etc. below) is called information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be realized by means of the arrangement order of each information agreed in advance (such as specified by the protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common parts of each information can also be identified and uniformly indicated to reduce the indication overhead caused by indicating the same information separately.

[0087] In addition, the specific indication method may also be various existing indication methods, such as but not limited to the above-mentioned indication methods and various combinations thereof. The specific details of the various indication methods can refer to the prior art and will not be repeated herein. As can be seen from the above, for example, when it is necessary to indicate multiple information of the same type, different indication methods may be used for different information. In the specific implementation process, the desired indication method can be selected according to specific needs. The embodiment of the present application does not limit the selected indication method. In this way, the indication method involved in the embodiment of the present application should be understood to cover various methods that can enable the party to be indicated to obtain the information to be indicated.

[0088] It should be understood that the information to be indicated can be sent as a whole, or divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different. The specific sending method is not limited in the embodiment of the present application. Among them, the sending period and / or sending time of these sub-information can be pre-defined, for example, pre-defined according to a protocol, or can be configured by the sending end device by sending configuration information to the receiving end device.

[0089] "Pre-definition" or "pre-configuration" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device, and the embodiments of the present application do not limit the specific implementation method. Among them, "saving" can mean saving in one or more memories. The one or more memories can be set separately or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories can also be partially set separately and partially integrated in a decoder, a processor, or a communication device. The type of memory can be any form of storage medium, which is not limited by the embodiments of the present application.

[0090] The "protocol" involved in the embodiments of the present application may refer to a protocol family in the communication field, a standard protocol with a similar protocol family frame structure, or a related protocol used in future communication systems, and the embodiments of the present application do not make specific limitations on this.

[0091] In the embodiments of the present application, descriptions such as "when...", "in the case of...", "if" and "if" all mean that the device will make corresponding processing under certain objective circumstances. It does not limit the time, nor does it require the device to have a judgment action when implementing it, nor does it mean that there are other limitations.

[0092] In the description of the embodiments of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the embodiments of the present application is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in the description of the embodiments of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or its similar expression refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" are used to distinguish the same or similar items with basically the same functions and effects. Those skilled in the art will appreciate that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference. At the same time, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way for easy understanding.

[0093] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0094] To facilitate understanding of the embodiments of the present application, first Figure 3 The communication system shown in the example is used to describe in detail the communication system applicable to the embodiment of the present application. Figure 3 A schematic diagram of the architecture of a communication system applicable to the communication method provided in an embodiment of the present application.

[0095] like Figure 3 As shown, the communication system mainly includes: a terminal and a network device.

[0096] A terminal may also be called user equipment (UE), an access terminal, a subscriber unit (subscriber unit), a user station, a mobile station (MS), a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The terminal in the embodiments of the present application can be a mobile phone, a cellular phone, a smart phone, a tablet computer, a wireless data card, a personal digital assistant (PDA), a wireless modem, a handset, a laptop computer, a machine type communication (MTC) terminal, a computer with a wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a smart home device (for example, a refrigerator, a television, an air conditioner, an electric meter, etc.), an intelligent robot, a robotic arm, a workshop equipment, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a vehicle-mounted terminal, a roadside unit with a terminal function, and a wireless terminal in a smart city. unit, RSU), etc., flying equipment (e.g., intelligent robot, hot air balloon, drone, airplane), etc. The terminal of the present application may also be a vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit built into the vehicle as one or more components or units. The terminal device may also be other devices with terminal functions, for example, the terminal device may also be a device that functions as a terminal in D2D communication.

[0097] The embodiments of the present application do not limit the device form of the terminal. The device for realizing the function of the terminal can be a terminal; it can also be a device that can support the terminal to realize the function, such as a chip system. The device can be installed in the terminal, or used in combination with the terminal. In the embodiments of the present application, the chip system can be composed of chips, or it can include chips and other discrete devices.

[0098] The network device may be a radio access network (RAN) device, also referred to as an access network device. The access network device may specifically be a next generation mobile communication system, such as a 6G access network device, such as a 6G base station, or in the next generation mobile communication system, the access network device may also have other naming methods, which are all included in the protection scope of the embodiments of the present application, and the present application does not make any restrictions on this. Alternatively, the access network device may also include 5G, such as a gNB in ​​a new radio (NR) system, or one or a group of antenna panels (including multiple antenna panels) of a base station in 5G, or a network node constituting a gNB, a transmission point (TRP or transmission point, TP) or a transmission measurement function (TMF), such as a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), an RSU with a base station function, or a wired access gateway, or a 5G core network element, etc. Alternatively, the access network device may also include: access point (AP) in a wireless fidelity (WiFi) system, wireless relay node, wireless backhaul node, various forms of macro base stations, micro base stations (also called small stations), relay stations, access points, wearable devices, vehicle-mounted devices, etc.

[0099] Among them, CU and DU can be set separately, or can also be included in the same network element, such as a baseband unit (BBU). RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU) or a remote radio head (RRH). It can be understood that the network device can be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, CU can be divided into a network device in the access network RAN, and CU can also be divided into a network device in the core network CN, which is not limited here.

[0100] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, CU, CU-CP, CU-UP, DU and RU are described as examples in this application. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0101] In this communication system, it is defined that under the condition that the sum of the lengths of the cyclic prefix and the symbol of the signal remains unchanged, there are multiple symbol structures with cyclic prefix lengths, such as the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure. Therefore, the terminal or network equipment can dynamically adjust the cyclic prefix length under the condition that the subcarrier spacing remains unchanged, so as to realize flexible and adjustable perception distance and meet various scenarios of practical applications.

[0102] The following will be combined Figure 4-Figure 5 The communication method provided in the embodiment of the present application can be applied to the above communication system and specifically applied to various scenarios mentioned in the above communication system, which are specifically introduced below.

[0103] Figure 4 The flow chart of the communication method provided in the embodiment of the present application is as follows. The communication method is applicable to the above communication system, and mainly involves the interaction between the terminal and the network device. Figure 4 As shown, the process of the communication method is as follows:

[0104] S401, the network device sends indication information to the terminal. Correspondingly, the terminal receives the indication information from the network device.

[0105] The indication information may be used to indicate a symbol structure of the first signal, such as one of at least two symbol structures.

[0106] The first signal may be a signal used only for perception, or a signal used for both perception and communication. Specifically, when the first signal is used for both perception and communication, the first signal may be one of a broadcast channel, a control channel, a data channel, and a reference signal. For example, the first signal may be a physical broadcast channel (PBCH), or may be a physical downlink shared channel (PDSCH), or may be a physical downlink control channel (PDCCH). Alternatively, the first signal may also be a demodulation reference signal (DMRS), or a channel state information-reference signal (CSI-RS), or a reference signal of other communication functions.

[0107] The symbol structure may include a cyclic prefix length and a symbol length. The cyclic prefix may be a CP, and the cyclic prefix length, i.e., the CP length, may be expressed in time or in a normalized number of sampling points, without limitation. The symbol may be an OFDM symbol or any other possible symbol, without limitation. The symbol length, i.e., the OFDM symbol length, may be expressed in time or in a normalized number of sampling points, without limitation.

[0108] It is understandable that the symbol structure may also include other parameters for describing the symbol, such as SCS, etc. In addition, the symbol structure may also be replaced by any other possible expressions, such as symbol configuration, or any other possible expressions, which are not limited.

[0109] At least two symbol structures have a constant sum of the length of the cyclic prefix and the symbol, while the cyclic prefix length and the symbol length change dynamically, that is, the cyclic prefix length is flexibly adjustable. For ease of understanding, take two symbol structures as an example, such as the first symbol structure and the second symbol structure, wherein the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure. That is, since the sum of the length of the cyclic prefix and the symbol remains constant, it can be equal to the length of the CP-OFDM symbol defined in the prior art to be compatible with the existing frame structure without affecting the existing configuration.

[0110] In the embodiment of the present application, the indication information can be used to indicate at least one of the cyclic prefix length of the first signal, the symbol length of the first signal, the ratio of the symbol length of the first signal to the first symbol length, or the ratio of the cyclic prefix length of the first signal to the first cyclic prefix length, which can be flexibly selected according to the actual situation and is not limited to this. Among them, the first symbol length and / or the second cyclic prefix length are predetermined, and can also be called the reference symbol length and / or the reference cyclic prefix length, or can also be called the symbol length and / or the cyclic prefix length defined by 3GPP, such as the symbol length and / or the cyclic prefix length defined by 3GPP under the SCS corresponding to the first signal, or there can be any other possible naming, which is not limited to this.

[0111] For example, taking the ratio of the symbol length of the first signal indicated by the indication information to the first symbol length as an example, other implementations can be understood by reference. Specifically, the length of the CP-OFDM symbol can be expressed as T0=T1+T2, T1 is the OFDM symbol length defined by 3GPP, and T2 is the CP length defined by 3GPP, such as SCS=60kHz, the OFDM symbol length is T1=1 / 60ms, and the CP length is T2=3 / 2560ms. Taking the OFDM symbol length defined by 3GPP as the first symbol length, the symbol length S1 of the first signal can be expressed as S1=T1*Xms, X represents the ratio of the symbol length of the first signal to the first symbol length, and the ratio indicated by the indication information can be one of at least two values ​​of X. X may be a real number greater than 0 and less than 1, and at least two values ​​of X may be at least two of 1 / 2, 3 / 4, 1 / 4, 7 / 8, 5 / 8, 3 / 8, 1 / 8, 15 / 16, 13 / 16, 11 / 16, 9 / 16, 7 / 16, 5 / 16, 3 / 16, and 1 / 16. Alternatively, X may be a real number greater than 1 / 2 and less than 1, and at least two values ​​of X may be at least two of 1 / 2, 3 / 4, 7 / 8, 5 / 8, 15 / 16, 13 / 16, 11 / 16, and 9 / 16, or at least two of 1 / 2, 3 / 4, 5 / 8, 15 / 16, and 9 / 16, or 1 / 2 and 3 / 4, so as to minimize the number of optional symbol structures, reduce configuration complexity, and reduce configuration overhead.

[0112] So, like Figure 5As shown, the cyclic prefix length S2 of the first signal is S2=T2+T1-S1, that is, the CP length is increased to improve the perception distance. For example, if the SCS is 15kHz, if the CP length is 4.6*10-6 seconds (s), the perception distance is L=(3*108)*(4.6*10-6)=1490 meters. If the CP length is increased to 29.6*10-6s, the perception distance is L=(3*108)x(29.6*10-6)=9690 meters, which greatly improves the perception distance. For another example, if the SCS is 30kHz and the CP length is 2.3*10-6s, the perception distance L = (3*108)*(2.3*10-6) = 745 meters. If the CP length is increased to 10.6*10-6s, the perception distance L = (3*108)*(10.6*10-6) = 3434 meters, which can also greatly improve the perception distance.

[0113] It can be understood that, because OFDM symbols are usually generated by fast Fourier transform (FFT), the number of FFT points is usually required to be a power of 2. Considering that the computational complexity of 3 and 5 points in FFT operations is also relatively low, the denominator of the above ratio can be a multiple of 2, or a multiple of a smaller odd number such as 3 or 5, so as to minimize the complexity of signal transmission and reception.

[0114] The network device may pre-configure various ratios of the symbol length of the first signal to the first symbol length, so that the network device can select a suitable ratio according to actual perception requirements and generate indication information accordingly.

[0115] Specifically, the indication information is carried in a broadcast message or a unicast message, and the broadcast message or the unicast message and the first signal sent or received by the terminal may have a scheduling relationship, so that the terminal can modulate or demodulate the first signal according to the symbol result indicated by the indication information. Therefore, the network device selects which message to use to send the indication information, and the ratio of the symbol length of the first signal indicated by the indication information to the first symbol length can be determined from the table item corresponding to the message.

[0116] For example, if the indication information is carried in a radio resource control (RRC) message or a media access control-control element (MAC-CE) message of a unicast message, the first signal is the CSI-RS scheduled by the RRC message or the MAC-CE message. Since the RRC layer and the MAC layer are not sensitive to the number of bits of the indication information, more bits can be used to indicate the value of the above X, that is, the value of X can have more options. An example can be shown in Table 3 below.

[0117] Table 3

[0118]

[0119]

[0120] That is, 16 values ​​of X are indicated by a 4-bit bitmap.

[0121] For another example, if the indication information is carried in a unicast message (downlink control information, DCI) message, the first signal is the DMRS scheduled by the DCI message. Considering that DCI is sensitive to the number of bits of the indication information, that is, it is necessary to indicate with as few bits as possible while maintaining a certain degree of flexibility, the value of X can be 4 of the above-mentioned various values, such as {1, 1 / 2, 3 / 4, 5 / 8} or {1, 1 / 2, 3 / 4, 9 / 16}, and an example can be shown in Tables 4 and 5 below.

[0122] Table 4

[0123] Indication information (bitmap) The value of X 00 1 01 1 / 2 10 3 / 4 11 5 / 8

[0124] Table 5

[0125] Indication information (bitmap) The value of X 00 1 01 1 / 2 10 3 / 4 11 9 / 16

[0126] That is, the four values ​​of X are indicated by a 2-bit bitmap.

[0127] For another example, if the indication information is carried in the PBCH of the broadcast message, the first signal is the PDCCH scheduled by the PBCH. Considering that the number of bits that can be used to carry the indication information in the PBCH is small, a 1-bit indication information is usually used in the PBCH to indicate the value of X of the PDCCH, such as 2 of the above-mentioned various values, such as {1, 1 / 2}. An example can be shown in Table 6 below.

[0128] Table 6

[0129] Instructions The value of X 0 1 1 1 / 2

[0130] That is to say, the network device can determine the indication information corresponding to the required value of X from the corresponding table items in Tables 3-6 above according to the signal type used for perception, such as CSI-RS, DMRS, or PDCCH, encapsulate the indication information into the corresponding unicast or broadcast message, and send it to the terminal.

[0131] It can be understood that the above indication information is only some examples of the symbol structure indication method and is not intended to be limiting. For example, the indication information may also indirectly or implicitly indicate relevant information of the symbol configuration, such as indicating the subcarrier spacing or the value index of X. In addition, the network device may also indicate the SCS of the first signal to the terminal, such as indicating the SCS first and then indicating the symbol structure, so that the terminal can determine the frame structure configuration or reference.

[0132] S402: The network device receives a first signal sent by the terminal, or sends a first signal to the terminal. Correspondingly, the terminal receives the first signal from the network device according to the indication information, or sends the first signal to the network device according to the indication information.

[0133] That is, the terminal may send the first signal of the symbol structure indicated by the indication information according to the indication information. Alternatively, the network device may also send the first signal of the symbol structure indicated by the indication information according to the indication information, and this is not limited. If the network device sends the first signal, the network device may also receive an echo signal of the first signal to achieve perception.

[0134] In summary, the cyclic prefix length and symbol length of a symbol structure in the prior art are determined, that is, the sum of the lengths of the cyclic prefix and symbol of the signal is determined, and the perception of the signal is also determined. Different from this, the present application defines a symbol structure with multiple cyclic prefix lengths when the sum of the lengths of the cyclic prefix and symbol of the signal remains unchanged, such as the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and symbol length of the second symbol structure. Therefore, it is possible to dynamically adjust the cyclic prefix length while keeping the subcarrier spacing unchanged, so as to achieve flexible and adjustable perception distance, which can meet various scenarios of practical applications.

[0135] Combination of the above Figure 4-Figure 5 The method provided in the embodiment of the present application is described in detail. Figure 6-Figure 7 A communication device for executing the communication method provided in an embodiment of the present application is described in detail.

[0136] Figure 6 This is a schematic diagram of the structure of the communication device provided in the embodiment of the present application. Figure 1 For example, Figure 6 As shown, the communication device 600 includes: a transceiver module 601 and a processing module 602. For ease of description, Figure 6 Only the main components of the communication device are shown.

[0137] Among them, the transceiver module 601 is used to perform the above Figure 6The processing module 602 is used to perform the above-mentioned Figure 4 The method shown has other functions besides the sending and receiving functions.

[0138] Optionally, the transceiver module 601 may include a sending module ( Figure 6 ) and a receiving module ( Figure 6 The sending module is used to implement the sending function of the communication device 600, and the receiving module is used to implement the receiving function of the communication device 600.

[0139] Optionally, the communication device 600 may further include a storage module ( Figure 6 When the processing module 602 executes the program or instruction, the communication device 600 can execute the above method. Figure 4 Functions of a terminal or network device in the method shown.

[0140] It can be understood that the communication device 600 can be a terminal or a network device, or a chip (system) or other parts or components that can be set in a terminal or a network device, or a device that includes a terminal or a network device, and this application does not limit this.

[0141] In addition, the technical effects of the communication device 600 can be referred to Figure 4 The technical effects of the communication method shown will not be repeated here.

[0142] Figure 7 A schematic diagram of the structure of the communication device provided in the embodiment of the present application Figure 2 For example, the communication device may be a terminal, or a chip (system) or other components or assemblies that may be provided in the terminal. Figure 7 As shown, the communication device 700 may include a processor 701. Optionally, the communication device 700 may further include a memory 702 and / or a transceiver 703. The processor 701 is coupled with the memory 702 and the transceiver 703, such as being connected via a communication bus.

[0143] Combine the following Figure 7 The components of the communication device 700 are described in detail:

[0144] The processor 701 is the control center of the communication device 700, and may be a processor or a general term for multiple processing elements. For example, the processor 701 is one or more central processing units (CPUs), or may be application specific integrated circuits (ASICs), or may be configured to implement one or more integrated circuits of the embodiments of the present application, such as one or more microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (FPGAs).

[0145] Optionally, the processor 701 may execute various functions of the communication device 700 by running or executing a software program stored in the memory 702 and calling data stored in the memory 702, such as executing the above Figure 4 The communication method shown.

[0146] In a specific implementation, as an embodiment, the processor 701 may include one or more CPUs, such as Figure 7 CPU0 and CPU1 are shown in FIG.

[0147] In a specific implementation, as an embodiment, the communication device 700 may also include multiple processors, such as Figure 7 1 and 10. Each of these processors may be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). A processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0148] The memory 702 is used to store the software program for executing the solution of the present application, and the execution is controlled by the processor 701. The specific implementation method can refer to the above method embodiment, which will not be repeated here.

[0149] Optionally, the memory 702 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 702 may be integrated with the processor 701, or may exist independently and be communicated to the processor 701 through the interface circuit ( Figure 7 (not shown) is coupled to the processor 701, which is not specifically limited in the embodiment of the present application.

[0150] The transceiver 703 is used for communication with other communication devices. For example, if the communication device 700 is a terminal, the transceiver 703 can be used to communicate with a network device, or with another terminal device. For another example, if the communication device 700 is a network device, the transceiver 703 can be used to communicate with a terminal, or with another network device.

[0151] Optionally, the transceiver 703 may include a receiver and a transmitter ( Figure 7 The receiver is used to implement a receiving function, and the transmitter is used to implement a sending function.

[0152] Optionally, the transceiver 703 may be integrated with the processor 701, or may exist independently and communicate with the processor 701 through the interface circuit ( Figure 7 (not shown) is coupled to the processor 701, which is not specifically limited in the embodiment of the present application.

[0153] Understandably, Figure 7 The structure of the communication device 700 shown in the figure does not constitute a limitation on the communication device, and the actual communication device may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0154] In addition, the technical effects of the communication device 700 can refer to the technical effects of the methods described in the above method embodiments, which will not be repeated here.

[0155] It should be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0156] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0157] The above embodiments can be implemented in whole or in part by software, hardware (such as circuits), firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0158] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0159] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0160] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0161] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of 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 and technical personnel 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.

[0162] 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 aforementioned method embodiments and will not be repeated here.

[0163] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0164] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0165] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0166] 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 the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0167] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: Receiving indication information from a network device, the indication information is used to indicate a symbol structure of a first signal, the symbol structure includes a cyclic prefix length and a symbol length, and the symbol structure of the first signal is one of at least two symbol structures, wherein the at least two symbol structures include a first symbol structure and a second symbol structure, the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure; The first signal is received from the network device according to the indication information, or the first signal is sent to the network device according to the indication information.

2. The method according to claim 1, characterized in that The indication information is used to indicate a symbol structure of the first signal, including: The indication information is used to indicate at least one of a cyclic prefix length of the first signal, a symbol length of the first signal, a ratio of the symbol length of the first signal to a first symbol length, or a ratio of the cyclic prefix length of the first signal to a first cyclic prefix length, wherein the first symbol length and / or the second cyclic prefix length are predetermined.

3. The method according to claim 2, characterized in that In the case where the indication information indicates the ratio of the symbol length of the first signal to the first symbol length, the ratio is one of at least two values, and the at least two values ​​are at least two of 1 / 2, 3 / 4, 1 / 4, 7 / 8, 5 / 8, 3 / 8, 1 / 8, 15 / 16, 13 / 16, 11 / 16, 9 / 16, 7 / 16, 5 / 16, 3 / 16 and 1 / 16, or at least two of 1 / 2, 3 / 4, 7 / 8, 5 / 8, 15 / 16, 13 / 16, 11 / 16 and 9 / 16, or at least two of 1 / 2, 3 / 4, 5 / 8, 15 / 16 and 9 / 16.

4. The method according to any one of claims 1 to 3, characterized in that The indication information is carried in a broadcast message or a unicast message.

5. The method according to claim 4, characterized in that If the indication information is carried in the physical broadcast channel PBCH of the broadcast message, the first signal is the physical downlink control channel PDCCH scheduled by the PBCH; or, if the indication information is carried in the radio resource control RRC message or the media access control-control unit MAC-CE message of the unicast message, the first signal is the channel state information reference signal CSI-RS scheduled by the RRC message or the MAC-CE message; or, if the indication information is carried in the downlink control information DCI message of the unicast message, the first signal is the demodulation reference signal DMRS scheduled by the DCI message.

6. A communication method, characterized in that: include: The network device sends indication information to the terminal, where the indication information is used to indicate a symbol structure of a first signal, where the symbol structure includes a cyclic prefix length and a symbol length, and the symbol structure of the first signal is one of at least two symbol structures, where the at least two symbol structures include a first symbol structure and a second symbol structure, the cyclic prefix length of the first symbol structure is not equal to the cyclic prefix length of the second symbol structure, the symbol length of the first symbol structure is not equal to the symbol length of the second symbol structure, and the sum of the cyclic prefix length and the symbol length of the first symbol structure is equal to the sum of the cyclic prefix length and the symbol length of the second symbol structure; The network device receives the first signal sent by the terminal, or sends the first signal to the terminal.

7. The method according to claim 6, characterized in that The indication information is used to indicate a symbol structure of the first signal, including: The indication information is used to indicate at least one of a cyclic prefix length of the first signal, a symbol length of the first signal, a ratio of the symbol length of the first signal to a first symbol length, or a ratio of the cyclic prefix length of the first signal to a first cyclic prefix length, wherein the first symbol length and / or the second cyclic prefix length are predetermined.

8. The method according to claim 7, characterized in that In the case where the indication information indicates the ratio of the symbol length of the first signal to the first symbol length, the ratio is one of at least two values, and the at least two values ​​are at least two of 1 / 2, 3 / 4, 1 / 4, 7 / 8, 5 / 8, 3 / 8, 1 / 8, 15 / 16, 13 / 16, 11 / 16, 9 / 16, 7 / 16, 5 / 16, 3 / 16 and 1 / 16, or at least two of 1 / 2, 3 / 4, 7 / 8, 5 / 8, 15 / 16, 13 / 16, 11 / 16 and 9 / 16, or at least two of 1 / 2, 3 / 4, 5 / 8, 15 / 16 and 9 / 16.

9. The method according to any one of claims 6 to 8, characterized in that: The indication information is carried in a broadcast message or a unicast message.

10. The method according to claim 9, characterized in that If the indication information is carried in the physical broadcast channel PBCH of the broadcast message, the perception signal is the physical downlink control channel PDCCH scheduled by the PBCH; or, if the indication information is carried in the radio resource control RRC message or the media access control-control unit MAC-CE message of the unicast message, the perception signal is the channel state information reference signal CSI-RS scheduled by the RRC message or the MAC-CE message; or, if the indication information is carried in the downlink control information DCI message of the unicast message, the perception signal is the demodulation reference signal DMRS scheduled by the DCI message.

11. The method according to any one of claims 6 to 10, characterized in that: In a case where the network device receives the first signal sent by the terminal, the method further includes: The network device receives an echo signal of the first signal.

12. A communication device, characterized in that: The apparatus comprises: a module for executing the method according to any one of claims 1-11.

13. A communication device, characterized in that: The communication device comprises: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device executes the method according to any one of claims 1-11.

14. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a computer program or instructions. When the computer program or instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 11.

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