Signal transmission method and device

Abstract

The invention provides a signal transmission method and device, and the method comprises the steps: determining a first frequency domain resource in a sidelink resource pool, and transmitting a first signal through the first frequency domain resource; wherein the bandwidth of the first frequency domain resource is equal to the maximum available bandwidth of the sidelink resource pool; the first signal is located in a first symbol of a first time unit in a time domain, a signal in the first symbol is used for automatic gain control, and the first signal is used for sensing measurement of a sidelink. According to the method provided by the invention, the first terminal device sends the first signal used for sensing measurement at the first symbol of the first time unit, and the first signal can keep the original function unchanged, that is, the first signal is used for automatic gain control, so that sensing measurement is realized through the first signal under the condition that the communication performance is not lost, and the user experience is improved. And communication perception integration of the sidelink is enabled.

Description

Technical Field

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

[0002] In current wireless communication systems, such as 5G communication systems, communication perception technology is mainly used in vehicle-to-everything (V2X) technology. In V2X, the perception information of the vehicle side mainly comes from the external vehicle-mounted radar. Based on the principle of Doppler effect, the vehicle side can transmit electromagnetic waves through the radar and measure the moving speed of the target relative to the radar based on the received echo. According to the time difference between the transmitted electromagnetic wave and the received echo, the distance of the target relative to the radar can be measured.

[0003] In order to meet the high-level autonomous driving business in the future, the vehicle side is required to have higher perception capabilities, so the vehicle side needs to be equipped with more and more high-precision external perception devices. Adding more and more hardware devices will lead to increased costs. In addition, with the evolution of communication technology, the realization of emerging technologies such as smart cities, smart industries, Internet of Vehicles, and telemedicine will become possible in the next generation of wireless communication systems. These emerging technologies also require robust and high-precision perception capabilities. Therefore, in future wireless communication systems, new information processing technologies that can simultaneously realize the coordination of perception and communication functions are of great significance.

[0004] Therefore, how to implement perception measurement without affecting the communication of the side link is an urgent problem to be solved. Summary of the invention

[0005] The present application provides a signal transmission method and device to achieve integrated communication and perception fusion of a side link.

[0006] In the first aspect, the present application provides a signal transmission method, the execution subject of the method is a first terminal device or one or more modules for the first terminal device, and the first terminal device is used as the execution subject for description. A first frequency domain resource is determined in a sidelink resource pool; the bandwidth of the first frequency domain resource is equal to the maximum available bandwidth of the sidelink resource pool; a first signal is sent through the first frequency domain resource; the first signal is located in the first symbol of the first time unit in the time domain, the signal in the first symbol is used for automatic gain control, and the first signal is used for perceptual measurement of the sidelink.

[0007] Through the method provided by the present application, the first terminal device sends a first signal for perception measurement in the first symbol of the first time unit. The first signal can also maintain its original function unchanged, that is, it is used for automatic gain control. Since the first signal is only located in the first symbol of the first time unit and is not located on symbols other than the first symbol, it will not affect data transmission, thereby realizing perception measurement through the first signal without causing loss of communication performance, and realizing communication perception integration. Furthermore, since the bandwidth of the first frequency domain resource is equal to the bandwidth of the sidelink resource pool, the bandwidth of the first signal sent in the measurement link resource pool can be maximized as much as possible, so that the perception measurement performed according to the first signal obtains a greater gain.

[0008] In a possible implementation, the method also includes: sending a second signal through a second frequency domain resource; the second signal is located within at least one symbol of the first time unit in the time domain, and the starting symbol of the at least one symbol is the second symbol of the first time unit; the bandwidth of the second frequency domain resource is smaller than the bandwidth of the first frequency domain resource.

[0009] In this method, while sending the first signal, the bandwidth of other signals in the first time unit is kept unchanged, thereby achieving forward compatibility.

[0010] In one possible implementation, the second signal includes at least one of the following: a demodulation reference signal; a signal carried on a physical sidelink control channel PSCCH; a signal carried on a physical sidelink shared channel PSSCH; a signal carried on a physical sidelink feedback channel PSFCH.

[0011] In this method, the original functions of other symbols in the first time unit do not change, that is, the other symbols in the first time unit are also used to send at least one of control information, signaling and data, thereby realizing perception measurement through the first signal without causing loss of communication performance, enabling the integration of communication perception of the side link.

[0012] In a possible implementation, the duration of the first signal is a first duration, the first duration is less than or equal to the duration of the first symbol, and the starting position of the first signal in the time domain is the starting position of the first symbol.

[0013] In one possible implementation, determining a first frequency domain resource in a sidelink resource pool includes: acquiring resource configuration information, where the resource configuration information is used to indicate the first frequency domain resource; and determining the first frequency domain resource in the sidelink resource pool according to the resource configuration information.

[0014] In a possible implementation manner, the resource configuration information comes from a network device or a directly connected terminal device, or the resource configuration information is predefined or preconfigured.

[0015] In a possible implementation, the method further includes: receiving a third signal, where the third signal is an echo signal of the first signal; and acquiring environmental perception information around the first terminal device based on the first signal and the third signal.

[0016] In a possible implementation, receiving the third signal includes: receiving the third signal within a first time range; a starting position of the first time range is later than or equal to a starting position of the first symbol, and an ending position of the first time range is earlier than or equal to an ending position of the first symbol.

[0017] In a possible implementation, the first signal is determined according to a first sequence, and the type of the first sequence includes a ZC sequence, a PN sequence, a gold sequence, or an m sequence; wherein an initial value of the first sequence is determined according to an identifier of the first terminal device.

[0018] In the above method, the first sequence is determined by using the identifier of the first terminal device, and the first signal is encrypted by the identifier of the first terminal device, so that when the first terminal device receives the echo signal of the first signal, it can filter out the interference of signals from other devices on the echo signal of the first signal through the identifier of the first terminal device, thereby achieving better perception performance.

[0019] In a possible implementation, the initial value of the first sequence is based on the parameter c init OK, parameter c init Satisfies the following form: c init =P×N UE-ID ; Wherein, P represents the identifier of the spatial area where the first terminal device is located, N UE-ID Indicates the identifier of the first terminal device.

[0020] In one possible implementation, the identifier of the first terminal device is different from the identifier of the second terminal device, and the first terminal device and the second terminal device are located in the same spatial area; or, the identifier of the first terminal device is the same as the identifier of the second terminal device, and the first terminal device and the second terminal device are located in different spatial areas.

[0021] In a possible implementation, the initial value of the first sequence is based on the parameter c init OK, parameter c init Satisfies the following form: c init =M×N UE-ID ; Wherein, M represents the identifier of the beam direction of the first terminal device, N UE-ID Indicates the identifier of the first terminal device.

[0022] In one possible implementation, the identifier of the first terminal device is different from the identifier of the second terminal device, and the first terminal device and the second terminal device are located in the same beam direction; or, the identifier of the first terminal device is the same as the identifier of the second terminal device, and the first terminal device and the second terminal device are located in different beam directions.

[0023] In a second aspect, the present application further provides a communication device, which can implement any of the methods provided in the first aspect. The communication device can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0024] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding functions of the network device or the terminal device in the method shown above. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes an interface circuit, which is used to support communication between the communication device and a device such as a terminal device.

[0025] In a possible implementation, the communication device includes corresponding functional modules, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0026] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, which can perform corresponding functions in the above method examples. For details, please refer to the description of the method provided in any aspect of the first aspect, which will not be repeated here.

[0027] In a third aspect, a communication device is provided, comprising a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or to send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method in any possible implementation manner of the first aspect through logic circuits or execution code instructions.

[0028] In a fourth aspect, a communication device is provided, comprising a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement a functional module of the method in any possible implementation method of the first aspect through a logic circuit or by executing code instructions.

[0029] In a fifth aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method in any possible implementation manner in the first aspect is implemented.

[0030] According to a sixth aspect, a computer program product storing instructions is provided, which, when executed by a processor, implements the method in any possible implementation manner of the first aspect.

[0031] In a seventh aspect, a circuit is provided, the circuit being used to execute the method in any possible implementation manner of the first aspect, the circuit may include a chip circuit. Optionally, the circuit may also be coupled to a memory.

[0032] In an eighth aspect, a chip is provided, the chip including a processor, configured to implement the method in any possible implementation of the first aspect. Optionally, the chip may also include a memory, and the chip may be composed of a chip, or may include a chip and other discrete devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a sidelink resource pool structure provided in an embodiment of the present application;

[0034] Figure 2 A schematic diagram of a sidelink resource pool structure provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of a communication system provided for use in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of a communication system provided for use in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of a signal transmission method flow chart provided in an embodiment of the present application;

[0038] Figure 6 A schematic diagram of a sidelink resource pool provided in an embodiment of the present application;

[0039] Figure 7 A schematic diagram of a time unit structure provided in an embodiment of the present application;

[0040] Figure 8 A schematic diagram of a time unit structure provided in an embodiment of the present application;

[0041] Fig. 9 A schematic diagram of area division provided in an embodiment of the present application;

[0042] Fig.10A schematic diagram of a beam direction provided in an embodiment of the present application;

[0043] Fig.11 A schematic diagram of an echo signal provided in an embodiment of the present application;

[0044] Fig.12 A signal receiving schematic diagram provided in an embodiment of the present application;

[0045] Fig.13 A signal receiving schematic diagram provided in an embodiment of the present application;

[0046] Fig.14 A signal receiving schematic diagram provided in an embodiment of the present application;

[0047] Fig.15 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0048] Fig.16 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0050] The communication method provided in the embodiment of the present application can be applied to long term evolution (LTE), fifth generation (5G) communication systems, such as 5G new radio (NR), or to various future communication systems, such as sixth generation (6G) communication systems. The communication method provided in the embodiment of the present application can also be applied to vehicle to everything (V2X) communication, Internet of Vehicles, autonomous driving, assisted driving and other fields.

[0051] The method and device provided in the embodiments of the present application are based on the same or similar technical concepts. Since the principles of solving problems by the method and the device are similar, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0052] Below, some terms in the embodiments of the present application are first explained to facilitate understanding by those skilled in the art.

[0053] In the embodiment of the present application, the network device may be a device in a wireless network, and the network device may also be referred to as a network apparatus. For example, the network device may be a radio access network (RAN) node that connects a terminal device to a wireless network, and may also be referred to as an access network device. The network device includes, but is not limited to, an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc., and may also be a network device in a 5G mobile communication system. For example, the next generation NodeB (gNB) in the NR system, the transmission reception point (TRP), TP; or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G mobile communication system; or the network device can also be a network node constituting a gNB or a transmission point. For example, a BBU, or a distributed unit (DU), etc.

[0054] In some deployments, the network equipment may include a centralized unit (CU) and a DU. The network equipment may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) layer. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. In some deployments, the CU can also be divided into a centralized unit control plane (CU-CP) node and a centralized unit user plane (CU-UP) node. Among them, the CU-CP is responsible for the control plane functions, and the CU-UP is responsible for the user plane functions.

[0055] The terminal device involved in the embodiments of the present application may be a wireless terminal device capable of receiving network device scheduling and indication information. The terminal device may be referred to as a terminal apparatus, and may also be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc. The terminal device may be a device including a wireless communication function (providing voice / data connectivity to the user). For example, a handheld device with a wireless connection function, or a vehicle-mounted device, a vehicle-mounted module, etc. At present, some examples of terminal devices are: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in Internet of Vehicles, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, or wireless terminals in smart homes, device-to-device (D2D) communication terminal equipment, vehicle to everything (V2X) communication terminal equipment, smart vehicles, telematics boxes (T-box), machine-to-machine / machine-type communications (M2M / MTC) terminal equipment, Internet of Things (IoT) The terminal device may be an on-board device, a vehicle device, an on-board module, a vehicle, an on-board unit (OBU), a roadside unit (RSU), a T-box, a chip or a system on chip (SOC), etc. The above chip or SOC may be installed in a vehicle, an OBU, an RSU or a T-box. The wireless terminal in industrial control may be a camera, a robot, etc. The wireless terminal in a smart home may be a TV, an air conditioner, a sweeper, a speaker, a set-top box, etc.

[0056] In this application, perception measurement, also known as wireless perception, refers to determining environmental perception information through wireless signals and the feedback signals of the wireless signals. Environmental perception information includes but is not limited to information such as the location of the target, the speed of the target, the distance to the target, and the direction of movement of the target. Targets include but are not limited to any objects that can reflect wireless signals, such as equipment, people, animals, etc. The environment includes one or more of a room, a house, a vehicle, a business, etc.

[0057] Through environmental perception information, the status of targets around the environment can be determined. For example, in V2X, vehicles can determine the position, speed, and motion status (turning, merging, reversing) of other vehicles or people around the environment through environmental perception information, thereby assisting driving and improving driving safety.

[0058] In this application, the sidelink (SL) resource pool may also be referred to as a resource pool. The resource pool may be network-configured; for example, within the network coverage, the network device sends resource pool information to the terminal device in the cell through the system information block (SIB), cell-specific radio resource control (RRC) signaling, or user-specific (UE-specific) RRC signaling, and the resource pool information is used to indicate the resource pool. Alternatively, the resource pool may also be pre-configured or pre-defined.

[0059] The resource pool may include one or more channels, and a channel includes a resource block (RB) set. For example, the bandwidth of each channel in the resource pool may be 10 MHz. Of course, the bandwidth of the channel may also be other values, which are not specifically limited in this application.

[0060] For example, if Figure 1 As shown, resource pool #1 may include two channels, namely channel #1 and channel #2. Channel #1 includes RB set #1, and channel #2 includes RB set #2. Each channel may also include protection bandwidth on both sides.

[0061] For example, if Figure 2 As shown, resource pool #2 may include one channel, namely channel #3. Channel #3 includes RB set #3.

[0062] like Figure 1As shown, channel #1 includes RB set #1, channel #2 includes RB set #2, resource pool #1 includes RB set #1, RB set #2, and the guard band between RB set #1 and RB set #2, or resource pool #1 includes the entire bandwidth in channel #1 and the entire bandwidth in channel #2. When a terminal device successfully listens-before-talk (LBT) on both channels, channel #1 and channel #2, the terminal device can use not only the resources on the RB sets in the two channels, but also the guard band between two adjacent RB sets.

[0063] Figure 3 A communication system applicable to the embodiment of the present application is shown. Figure 3 As shown, the communication system may include a terminal device 101 and a terminal device 102. The terminal device 101 and the terminal device 102 may communicate via a side link. For example, the terminal device 101 and the terminal device 102 may interact via a proximity communication 5 (PC5) interface. It is understood that the communication system may also include more terminal devices, which are not shown in the figure.

[0064] In a possible implementation, the communication system may further include a network device 103. The network device 103 may communicate with the terminal device 101, and the network device 103 may also communicate with the terminal device 102. Figure 3 As shown, terminal device 101 and terminal device 102 may be within the coverage of network device 103; or one of terminal device 101 and terminal device 102 is within the coverage of network device 103, and the other is outside the coverage of network device 103 (the figure takes the example that terminal device 101 is within the coverage of network device 103 and terminal device 102 is outside the coverage of network device 103); or both terminal device 101 and terminal device 102 are outside the coverage of network device 103.

[0065] In a possible implementation scenario, the communication system may be a V2X communication system. Figure 4 As shown, V2X can include direct communications between vehicles (vehicle-to-vehicle, V2V), vehicles and roadside infrastructure (vehicle-to-infrastructure, V2I), vehicles and pedestrians (vehicle-to-pedestrian, V2P), and V2X links between vehicles and networks (vehicle-to-network, V2N) or vehicles to any entity.

[0066] As the degree of automobile intelligence increases, the types of on-board sensors are becoming more and more abundant, such as laser radar, camera, millimeter wave radar, etc. The on-board sensors in the car can make the car perceive the traffic, vehicles, pedestrians and other information around the car body. The car can use this information to improve the safety of the vehicle's adaptive cruise and other auxiliary driving functions, and realize the intelligence of the car. At present, the on-board sensors of the car, such as laser radar, camera, millimeter wave radar, etc., only have the function of perception. However, in the future communication system, the realization of integrated sensing and communications (ISAC) is an important technical trend. ISAC, that is, a new information processing technology based on software and hardware resource sharing or information sharing, realizes the coordination of perception and communication functions at the same time. It can share spectrum, hardware platform, and even baseband waveform and signal processing between communication and perception, thereby improving the spectrum efficiency, energy efficiency and hardware efficiency of the system to obtain integration gain. Furthermore, the mutual assistance and mutual gain of the two functions of interaception can also be used to improve each other's performance, thereby obtaining coordination gain, such as communication-assisted perception technology and perception-assisted communication technology.

[0067] To this end, the present application provides a method that can simultaneously achieve the coordination of perception and communication functions, realize perception without communication loss, and achieve better perception performance.

[0068] 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.

[0069] The method provided in this application is applied to Figure 3 or Figure 4 When the system is in Figure 3 or Figure 4 The terminal device or the module in the terminal device implements the method provided in the embodiment of the present application.

[0070] It can be understood that the present application does not particularly limit the specific structure of the execution subject of the method provided in the embodiment of the present application, and can be applied to the first terminal device or a module in the first terminal device, as long as it can communicate according to the method provided in the embodiment of the present application by running a program that records the code of the method provided in the embodiment of the present application. The interaction between the terminal device and the network device is used as an example for explanation below.

[0071] like Figure 5 FIG. 1 is a flow chart of a signal transmission method provided in an embodiment of the present application, the method comprising:

[0072] Step 501: A first terminal device determines a first frequency domain resource in a sidelink resource pool.

[0073] In one implementation, the first terminal device may obtain resource configuration information, where the resource configuration information is used to indicate the first frequency domain resource. The first terminal device may thereby determine the first frequency domain resource in the sidelink resource pool according to the resource configuration information. The resource configuration information is not limited to being obtained from a network device, but is obtained from a directly connected terminal device. The resource configuration information may also be preconfigured or predefined (e.g., the resource configuration information is defined in a protocol).

[0074] In this application, the bandwidth of the first frequency domain resource is less than or equal to the maximum available bandwidth of the sidelink resource pool. The bandwidth of the signal used for perception measurement directly affects the perception performance. The larger the bandwidth of the first frequency domain resource, the smaller the distance resolution enabled by the perception signal in the first frequency domain resource, and the closer targets can be distinguished, and the perception performance is better.

[0075] Part of the frequency domain resources in the sidelink resource pool can be used as a protection bandwidth, and the sidelink resource pool can include at least one protection bandwidth, for example, as described above Figure 1 As shown, the sidelink resource pool includes 4 protection bandwidths. If all protection bandwidths in the sidelink resource pool can be used for data transmission, then the maximum available bandwidth of the sidelink resource pool is equal to the bandwidth of the sidelink resource pool; if one or more protection bandwidths in the sidelink resource pool cannot be used for data transmission, then the maximum available bandwidth of the sidelink resource pool is less than the bandwidth of the sidelink resource pool.

[0076] For example, if Figure 6 As shown, the bandwidth of the sidelink resource pool is W1, and the sidelink resource pool also includes protection bandwidths at the lowest and highest sides of the frequency domain, which are the first protection bandwidth and the second protection bandwidth, respectively. The bandwidth of the first protection bandwidth is W2, and the bandwidth of the second protection bandwidth is W3.

[0077] In one implementation, if the first protection bandwidth and the second protection bandwidth of the sidelink resource pool can be used for data transmission, then the maximum available bandwidth of the sidelink resource pool is equal to the bandwidth of the sidelink resource pool, and the bandwidth of the first frequency domain resources may be equal to the bandwidth of the sidelink resource pool, for example, the bandwidth of the first frequency domain resources is equal to the bandwidth W1 of the sidelink resource pool.

[0078] In one implementation, if the first protection bandwidth and the second protection bandwidth of the sidelink resource pool cannot be used for data transmission, then the maximum available bandwidth of the sidelink resource pool is less than the bandwidth of the sidelink resource pool, and the maximum available bandwidth of the sidelink resource pool is W1-(W2+W3)=W4. The bandwidth of the first frequency domain resource is less than the bandwidth of the sidelink resource pool. For example, the bandwidth of the first frequency domain resource can be equal to W1-(W2+W3)=W4.

[0079] In one implementation, if the first protection bandwidth of the sidelink resource pool cannot be used for data transmission, but the second protection bandwidth can be used for data transmission, then the maximum available bandwidth of the sidelink resource pool is less than the bandwidth of the sidelink resource pool, and the maximum available bandwidth of the sidelink resource pool is W1-W2+W3. The bandwidth of the first frequency domain resource is less than the bandwidth of the sidelink resource pool, for example, the bandwidth of the first frequency domain resource is equal to W1-W2+W3.

[0080] In one implementation, if the second protection bandwidth of the sidelink resource pool cannot be used for data transmission, but the first protection bandwidth can be used for data transmission, then the maximum available bandwidth of the sidelink resource pool is less than the bandwidth of the sidelink resource pool, and the maximum available bandwidth of the sidelink resource pool is W1-W3+W2. The bandwidth of the first frequency domain resource is less than the bandwidth of the sidelink resource pool, for example, the bandwidth of the first frequency domain resource is equal to W1-W3+W2.

[0081] In the present application, the first terminal device may also determine the second frequency domain resource in the sidelink resource pool. For specific determination methods, reference may be made to the description of the first frequency domain resource. In one implementation, the bandwidth of the second frequency domain resource is smaller than the bandwidth of the first frequency domain resource.

[0082] Step 502: The first terminal device sends a first signal through a first frequency domain resource, and sends a second signal through a second frequency domain resource.

[0083] The first signal is located in the first symbol of the first time unit in the time domain, and the second signal is located in at least one symbol of the first time unit in the time domain, and the starting symbol of the at least one symbol is the second symbol of the first time unit. The first time unit can be a time slot or a subframe. "Symbol" can refer to an orthogonal frequency division multiplexing (OFDM) symbol.

[0084] In the present application, the duration of the first signal is the first duration, which is less than or equal to the duration of the first symbol of the first time unit. In one implementation, the starting position of the first signal in the time domain is the starting position of the first symbol of the first time unit.

[0085] In the present application, the signal in the first symbol of the first time unit is used for automatic gain control (AGC). For automatic gain control, the signal in the first symbol of the first time unit is not used for data transmission, and the receiving end does not need to decode the information carried by the signal in the first symbol. The receiving end only detects the energy of the signal in the first symbol to determine the gain of the signal of the symbol after receiving the first symbol. Therefore, the first signal in the present application can be used for automatic gain control of the receiving end. Furthermore, the first signal in the present application can also be used for perception measurement of the side link. Since the signal in the first symbol is not used for data transmission, the first signal is used for perception measurement of the side link and will not affect the communication of the side link.

[0086] In the present application, the first signal may occupy only part of the duration of the first symbol in the first time unit, that is, the duration of the first signal is less than the duration of the first symbol. In this case, in addition to the first signal, the first symbol in the first time unit may also include other signals, such as a fourth signal. The fourth signal and the first signal do not overlap in the time domain. The fourth signal may be the same as the first signal (for example, the signal waveform is the same), and the fourth signal may also be the same or partially the same as the signal in the second symbol in the first time unit. Both the fourth signal and the first signal are used for automatic gain control at the receiving end. Whether the fourth signal is used for perception measurement of the side link is not limited in the present application.

[0087] Among them, for automatic gain control, there may be the following process: assuming that the device receiving the second signal is a third terminal device, the third terminal device first receives the first signal, and then adjusts the gain of the received signal according to the energy of the received first signal, so that the received signal strength remains stable, thereby ensuring the reception quality of the received signal. For example, if the third terminal device determines that the energy of the received first channel is greater than the threshold, the signal gain of the RF end is reduced; if the third terminal device determines that the energy of the received first channel is less than or equal to the threshold, the signal gain of the RF end is increased, so that the received signal strength can be ensured to remain within the preset range.

[0088] In the present application, the second signal includes at least one of the following:

[0089] Demodulation reference signal (DMRS); signal carried on the physical sidelink control channel (PSCCH); signal carried on the physical sidelink shared channel (PSSCH); signal carried on the physical sidelink feedback channel (PSFCH).

[0090] Among them, DMRS can be used for channel estimation. The signal carried on PSCCH may include information such as sidelink control information (SCI). The signal carried on PSSCH may include at least one of control information, data, and SCI feedback information. The signal carried on PSFCH may include side feedback information, and the side feedback information may be used for feedback of data information. The side feedback information may include hybrid automatic repeat request (HARQ) response feedback information, such as acknowledgement (ACK) or negative acknowledgement (NACK); the side feedback information may also include channel state indication (CSI) feedback information and other information.

[0091] For example, if Figure 7 As shown, taking the first time unit including 14 symbols as an example, symbol 0 of the first time unit includes a first signal, and the duration of the first signal is less than the duration of symbol 0. The first time unit also includes a second signal, specifically, the second signal is located in symbols 1 to 12 of the first time unit, and the bandwidth of the first signal is greater than the bandwidth of the second signal. Among them, symbol 1 of the first time unit includes DMRS and a signal carried on PSCCH, and these two signals occupy different frequency domain resources in symbol 1; symbols 2 and 3 of the first time unit include a signal carried on PSSCH and a signal carried on PSCCH, and these two signals occupy different frequency domain resources in symbols 2 and 3; symbols 4, 7 and 10 of the first time unit include DMRS; symbols 5, 6, 8, 9, 11 and 12 of the first time unit include signals carried on PSCCH; symbol 13 of the first time unit is a guard period (GAP) symbol, and the first terminal device does not send a signal in symbol 13.

[0092] For example, Figure 8 As shown, taking the first time unit including 14 symbols as an example, the first symbol of the first time unit includes a first signal, and the duration of the first signal is less than the duration of symbol 0. The first time unit also includes a second signal, and the bandwidth of the first signal is greater than the bandwidth of the second signal. Specifically, the second signal is located in symbols 1 to 9 and symbols 11 to 12 of the first time unit. Among them, symbols 1 and 2 of the first time unit include a signal carried on PSSCH and a signal carried on PSCCH, and these two signals occupy different frequency domain resources in symbols 1 and 2; symbols 2 and 8 of the first time unit include DMRS; symbols 4 to 7 and symbol 9 of the first time unit include signals carried on PSSCH; symbol 11 of the first time unit includes a signal for AGC, and the signal in symbol 11 can be a copy of the signal in symbol 12; symbol 11 of the first time unit includes a signal carried on PSFCH. Among them, symbols 10 and 13 of the first time unit are used as GAP symbols.

[0093] In the present application, the first signal is determined according to a first sequence, and the type of the first sequence includes but is not limited to a ZC (Zadoff-Chu) sequence, a pseudo-noise (PN) sequence, a gold sequence, an m sequence, and the like.

[0094] In one implementation, the initial value of the first sequence is determined according to an identifier of the first terminal device.

[0095] For example, taking the first sequence as a 31-bit PN sequence, the first sequence r(n) may satisfy the following form:

[0096]

[0097] c(n)=(x1(n+N C )+x2(n+N C ))mod2

[0098] x1(n+31)=(x1(n+3)+x1(n))mod2

[0099] x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2;

[0100] Among them, N C =1600, x1(n) and x2(n) are two m sequences, the 31 initial values ​​of x1(n) are x1(0)=1, x1(n)=0, n=1,2,…,30, the 31 initial values ​​of x2(n) are based on the parameter c init OK, parameter c initDetermined based on the identification of the first terminal device. For example, the parameter i=1,2,…,30,N UE-ID Indicates the identifier of the first terminal device.

[0101] In the above method, the first sequence is determined by using the identifier of the first terminal device, and the first signal is encrypted by the identifier of the first terminal device, so that when the first terminal device receives the echo signal of the first signal, it can filter out the interference of signals from other devices on the echo signal of the first signal through the identifier of the first terminal device, thereby achieving better perception performance.

[0102] In one implementation, the space where the terminal device is located can be divided into different areas. The identifiers of the terminal devices in different areas can be the same, and the identifiers of the terminal devices in the same area can be different, thereby reducing the number of bits required for the identification of the terminal device, reducing the load of the first sequence, and lowering the ability requirements and decoding requirements for the terminal device to send the first signal.

[0103] For example, if Fig. 9 As shown, the space can be divided into four areas, namely area 1, area 2, area 3 and area 4. The value ranges of the terminal devices in these four areas can all be {0, 1, 2, ..., Pconst}, where Pconst is an integer greater than 0. Assuming that the first terminal device and the second terminal device are located in different spatial areas, for example, the first terminal device is located in area 1 and the second terminal device is located in area 3, then the identifier of the first terminal device and the identifier of the second terminal device may be the same or different. Of course, if the first terminal device and the second terminal device are located in the same spatial area, then the identifier of the first terminal device is different from the identifier of the second terminal device.

[0104] In this scenario, the parameter c init The following forms can also be met:

[0105] c init =P×N UE-ID ;

[0106] Wherein, P represents the identifier of the spatial area where the first terminal device is located, and N UE-ID Indicates the identifier of the first terminal device. For example, when the first sequence is a PN sequence, multiple initial values ​​x2(i) of x2(n) satisfy: i=1,2,…。

[0107] In one implementation, terminal devices in different beam directions can be divided into different groups, and terminal devices in the same beam direction are grouped together. In this way, the identifiers of terminal devices in different beam directions can be the same, and the identifiers of terminal devices in the same beam direction are different, but the value range of each group of terminal devices can be the same. This can reduce the number of bits required for the identification of the terminal device, reduce the load of the first sequence, and reduce the ability requirements and decoding requirements for the terminal device to send the first signal.

[0108] For example, if Fig.10 As shown, it is assumed that the first terminal device is located in beam direction 1 and the second terminal device is located in beam direction 2. The value ranges of the terminal devices in these two beam directions can both be {0, 1, 2, ..., Pconst}, where Pconst is an integer greater than 0. The identifier of the first terminal device and the identifier of the second terminal device can be the same or different.

[0109] Of course, if the first terminal device and the second terminal device are located in the same beam direction, the identifier of the first terminal device is different from the identifier of the second terminal device.

[0110] In this scenario, the parameter c init The following forms can also be met:

[0111] c init =M×N UE-ID ;

[0112] Wherein, M represents the identifier of the beam direction where the first terminal device is located, and N UE-ID Indicates the identifier of the first terminal device. For example, when the first sequence is a PN sequence, multiple initial values ​​x2(i) of x2(n) satisfy: i=1,2,…。

[0113] Step 503: The first device receives the third signal, and obtains environmental perception information around the first terminal device based on the first signal and the third signal.

[0114] The third signal is an echo signal (also called a reflection signal) of the first signal. The third signal is a signal after the first signal is reflected by other equipment or a target.

[0115] For example, if Fig.11 As shown, the first signal sent by terminal device 1 is reflected by terminal device 2 and then received by terminal device 1. The signal received by terminal device 1 is the third signal.

[0116] In the present application, the first terminal device may receive the third signal within a first time range, wherein the starting position of the first time range is later than or equal to the starting position of the first symbol, and the ending position of the first time range is earlier than or equal to the ending position of the first symbol.

[0117] For example, it is assumed that the starting position of the first symbol of the first time unit in the time domain is S1, and the ending position in the time domain is S2.

[0118] In one implementation, Fig.12 As shown, the first terminal device sends a first signal between the starting position of the first symbol of the first time unit and position S3, and position S3 is between S1 and S2. The first terminal device receives an echo signal (i.e., a third signal) of the first signal between positions S4 and S2, and position S4 is between S3 and S2, and the duration between S3 and S4 is greater than 0. The first terminal device does not send a signal between S3 and S4, and S3 and S4 serve as a transceiver conversion interval. This implementation method can be applicable to a scenario in which the first terminal device uses a set of antennas to send and receive signals.

[0119] In one implementation, Fig.13 As shown, the first terminal device sends a first signal between the starting position of the first symbol of the first time unit and position S3, and position S3 is located between S1 and S2. The first terminal device receives an echo signal (i.e., a third signal) of the first signal between S1 and S2. This implementation method can be applicable to a scenario in which the first terminal device uses different antennas to send and receive signals respectively. In this implementation method, it is possible to obtain surrounding environmental perception information without a near-end blind spot.

[0120] In one implementation, Fig.14 As shown, the first terminal device uses the first antenna to send the first signal between the starting position of the first symbol of the first time unit and the position S3, and the position S3 is located between S1 and S2. The first terminal device uses the first antenna to receive the echo signal (i.e., the third signal) of the first signal between positions S4 and S2, and the position S4 is located between S3 and S2, and the duration between S3 and S4 is greater than 0. The first terminal device does not use the first antenna to send a signal between S3 and S4, and S3 and S4 serve as a transceiver conversion interval. The first terminal device can also use the second antenna to receive the third signal of the first signal between S1 and S2. This implementation method can be applicable to scenarios where the first terminal device uses multiple sets of antennas to send and receive signals. In this implementation method, it is possible to obtain surrounding environmental perception information without blind spots. The terminal device receives the third signal through multiple antennas, and can obtain redundant environmental perception information, thereby improving the perception accuracy through redundant environmental perception information.

[0121] In this application, the environmental perception information acquired by the first terminal device may include but is not limited to the position and speed of the target reflecting the first signal, the distance between the target and the first terminal device, and the moving direction of the target. The target includes but is not limited to any object that can reflect the first signal, such as equipment, people, animals, etc.

[0122] For example, based on the signal propagation speed, the distance s of the target reflecting the first signal can be determined as: s=ct / 2, where t is the time from when the first signal is sent to when the third signal is received, and c is the signal propagation speed, that is, the speed of light.

[0123] For example, when the first terminal device and the target reflecting the first signal move relative to each other, the frequency of the third signal will be different from the frequency of the first signal. For example, when the target approaches the first terminal device, the frequency of the third signal will be higher than the frequency of the first signal; conversely, when the target moves away from the first terminal device, the frequency of the third signal will be lower than the frequency of the first signal. Therefore, according to this principle, by detecting the frequency difference between the third signal and the first signal, the moving speed of the target relative to the first terminal device can be measured.

[0124] Through the method provided in the present application, the first terminal device sends a first signal for perception measurement in the first symbol of the first time unit, and the original functions of other symbols in the first time unit do not change, that is, the other symbols in the first time unit are also used to send at least one of control information, signaling and data. Since the first signal is only located in the first symbol of the first time unit and not on symbols other than the first symbol, it will not affect data transmission, thereby realizing perception measurement through the first signal without causing loss of communication performance, and realizing communication perception integration.

[0125] In the embodiments provided by the present application, the methods provided by the embodiments of the present application are introduced from the perspective of interaction between various devices. In order to implement the functions in the methods provided by the embodiments of the present application, the terminal device may include a hardware structure and / or a software module to implement the functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the functions described above is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0126] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0127] Same as above idea, Fig.15 As shown, the embodiment of the present application also provides a communication device 1500 for implementing the function of the first terminal device in the above method. For example, the device can be a software module or a chip system. In the embodiment of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices. The communication device 1500 may include: a processing unit 1501 and a communication unit 1502.

[0128] In the embodiment of the present application, the processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, etc. The communication unit may also be referred to as a transceiver, a transceiver, a transceiver device, or a transceiver unit, etc. The transceiver unit may include a sending unit and / or a receiving unit, which are respectively used to perform the sending and receiving steps of the first terminal device in the above method embodiment.

[0129] The following, combined Figure 15 to Figure 16 The communication device provided in the embodiment of the present application is described in detail. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the contents not described in detail can be referred to the method embodiment above, and will not be repeated here for the sake of brevity.

[0130] In one implementation, the communication device 1500 may perform the following functions:

[0131] A processing unit, configured to determine a first frequency domain resource in a sidelink resource pool; a bandwidth of the first frequency domain resource is equal to a bandwidth of the sidelink resource pool;

[0132] A communication unit, used for sending a first signal via the first frequency domain resource; the first signal is located in the first symbol of the first time unit in the time domain, the signal in the first symbol is used for automatic gain control, and the first signal is used for perceptual measurement of a side link.

[0133] In one implementation, the communication unit is also used to: send a second signal through a second frequency domain resource; the second signal is located within at least one symbol of the first time unit in the time domain, and the starting symbol of the at least one symbol is the second symbol of the first time unit; the bandwidth of the second frequency domain resource is smaller than the bandwidth of the first frequency domain resource.

[0134] In one implementation, the second signal includes at least one of the following:

[0135] Demodulation reference signal; signal carried on the physical sidelink control channel PSCCH; signal carried on the physical sidelink shared channel PSSCH; signal carried on the physical sidelink feedback channel PSFCH.

[0136] In one implementation, the duration of the first signal is a first duration, the first duration is less than or equal to the duration of the first symbol, and the starting position of the first signal in the time domain is the starting position of the first symbol.

[0137] In one implementation, the processing unit is specifically configured to:

[0138] Acquire resource configuration information, where the resource configuration information is used to indicate the first frequency domain resource;

[0139] The first frequency domain resource is determined in the sidelink resource pool according to the resource configuration information.

[0140] In one implementation, the resource configuration information comes from a network device or a directly connected terminal device, or the resource configuration information is predefined or preconfigured.

[0141] In one implementation, the communication unit is further configured to:

[0142] receiving a third signal, where the third signal is an echo signal of the first signal;

[0143] The processing unit is also used to obtain environmental perception information around the first terminal device based on the first signal and the third signal.

[0144] In one implementation, the communication unit is specifically used to: receive the third signal within a first time range; the starting position of the first time range is later than or equal to the starting position of the first symbol, and the ending position of the first time range is earlier than or equal to the ending position of the first symbol.

[0145] In one implementation, the first signal is determined according to a first sequence, and the type of the first sequence includes a ZC sequence, a PN sequence, a gold sequence, or an m sequence; wherein the initial value of the first sequence is determined according to an identifier of the first terminal device.

[0146] In one implementation, the initial value of the first sequence is based on the parameter c init Determine that the parameter c init Satisfies the following form: c init =P×N UE-ID; Wherein, P represents the identifier of the spatial area where the first terminal device is located, N UE-ID Represents the identifier of the first terminal device.

[0147] In one implementation, the identifier of the first terminal device is different from the identifier of the second terminal device, and the first terminal device and the second terminal device are located in the same spatial area;

[0148] Alternatively, the identifier of the first terminal device is the same as the identifier of the second terminal device, and the first terminal device and the second terminal device are located in different spatial areas.

[0149] The above are only examples, and the processing unit 1501 and the communication unit 1502 may also perform other functions. For a more detailed description, please refer to the relevant description in the method embodiment shown above, which will not be repeated here.

[0150] like Fig.16 The communication device 1600 provided in an embodiment of the present application is shown. Fig.16 The device shown can be Fig.15 The communication device can be applied to the flowchart shown above to perform the functions of the terminal device in the above method embodiment. For ease of explanation, Fig.16 Only the main components of the communication device are shown.

[0151] like Fig.16 As shown, the communication device 1600 includes a processor 1610 and an interface circuit 1620. The processor 1610 and the interface circuit 1620 are coupled to each other. It can be understood that the interface circuit 1620 can be a transceiver or an input-output interface.

[0152] Optionally, in one implementation, the communication device 1600 may further include a memory 1630 for storing instructions executed by the processor 1610 or storing input data required for the processor 1610 to run instructions or storing data generated after the processor 1610 runs instructions.

[0153] When the communication device 1600 is used to implement the method shown above, the processor 1610 is used to implement the function of the processing unit 1501, and the interface circuit 1620 is used to implement the function of the communication unit 1502.

[0154] It is understandable that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0155] In the embodiments of the present application, the memory may be a random access memory (RAM), a flash memory, 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), a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an ASIC.

[0156] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) that contain computer-usable program code.

[0157] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0158] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0159] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A signal transmission method, It is characterized in that The module applied to the first terminal device or in the first terminal device includes: Determine a first frequency domain resource in a sidelink resource pool; the bandwidth of the first frequency domain resource is equal to the maximum available bandwidth of the sidelink resource pool; A first signal is sent via the first frequency domain resource; the first signal is located within a first symbol of a first time unit in the time domain, the signal in the first symbol is used for automatic gain control, and the first signal is used for perceptual measurement of a side link.

2. The method according to claim 1, It is characterized in that The method further comprises: A second signal is sent via a second frequency domain resource; the second signal is located within at least one symbol of the first time unit in the time domain, and a starting symbol of the at least one symbol is the second symbol of the first time unit; a bandwidth of the second frequency domain resource is smaller than a bandwidth of the first frequency domain resource.

3. The method according to claim 2, It is characterized in that The second signal includes at least one of the following: Demodulation reference signal; signal carried on the physical sidelink control channel PSCCH; signal carried on the physical sidelink shared channel PSSCH; signal carried on the physical sidelink feedback channel PSFCH.

4. The method according to any one of claims 1 to 3, It is characterized in that The duration of the first signal is a first duration, the first duration is less than or equal to the duration of the first symbol, and the starting position of the first signal in the time domain is the starting position of the first symbol.

5. The method according to any one of claims 1 to 4, It is characterized in that The determining of the first frequency domain resource in the sidelink resource pool includes: Acquire resource configuration information, where the resource configuration information is used to indicate the first frequency domain resource; The first frequency domain resource is determined in the sidelink resource pool according to the resource configuration information.

6. The method according to claim 5, It is characterized in that The resource configuration information comes from a network device or a directly connected terminal device, or the resource configuration information is predefined or preconfigured.

7. The method according to any one of claims 1 to 6, It is characterized in that The method further comprises: receiving a third signal, where the third signal is an echo signal of the first signal; Acquire environmental perception information around the first terminal device according to the first signal and the third signal.

8. The method according to claim 7, It is characterized in that The receiving of the third signal comprises: The third signal is received within a first time range; a starting position of the first time range is later than or equal to a starting position of the first symbol, and an ending position of the first time range is earlier than or equal to an ending position of the first symbol.

9. The method according to any one of claims 1 to 8, It is characterized in that The first signal is determined according to a first sequence, and the type of the first sequence includes a ZC sequence, a PN sequence, a gold sequence, or an m sequence; wherein an initial value of the first sequence is determined according to an identifier of the first terminal device.

10. The method according to claim 9, It is characterized in that The initial value of the first sequence is based on the parameter c init Determine that the parameter c init Satisfy the following form: c init =P×N UE-ID ; Wherein, P represents the identifier of the spatial area where the first terminal device is located, and N UE-ID Represents the identifier of the first terminal device.

11. The method according to claim 10, It is characterized in that The identifier of the first terminal device is different from the identifier of the second terminal device, and the first terminal device and the second terminal device are located in the same spatial area; Alternatively, the identifier of the first terminal device is the same as the identifier of the second terminal device, and the first terminal device and the second terminal device are located in different spatial areas.

12. A communication device, It is characterized in that include: A processing unit, configured to determine a first frequency domain resource in a sidelink resource pool; the bandwidth of the first frequency domain resource is equal to a maximum available bandwidth of the sidelink resource pool; A communication unit, used for sending a first signal through the first frequency domain resource; the first signal is located in the first symbol of the first time unit in the time domain, the signal in the first symbol is used for automatic gain control, and the first signal is used for perceptual measurement of the side link.

13. The device according to claim 12, It is characterized in that The communication unit is also used for: A second signal is sent via a second frequency domain resource; the second signal is located within at least one symbol of the first time unit in the time domain, and a starting symbol of the at least one symbol is the second symbol of the first time unit; a bandwidth of the second frequency domain resource is smaller than a bandwidth of the first frequency domain resource.

14. The device according to claim 13, It is characterized in that The second signal includes at least one of the following: Demodulation reference signal; signal carried on the physical sidelink control channel PSCCH; signal carried on the physical sidelink shared channel PSSCH; signal carried on the physical sidelink feedback channel PSFCH.

15. The device according to any one of claims 12 to 14, It is characterized in that The duration of the first signal is a first duration, the first duration is less than or equal to the duration of the first symbol, and the starting position of the first signal in the time domain is the starting position of the first symbol.

16. The device according to any one of claims 12 to 15, It is characterized in that The processing unit is specifically used for: Acquire resource configuration information, where the resource configuration information is used to indicate the first frequency domain resource; The first frequency domain resource is determined in the sidelink resource pool according to the resource configuration information.

17. The device according to claim 16, It is characterized in that The resource configuration information comes from a network device or a directly connected terminal device, or the resource configuration information is predefined or preconfigured.

18. The device according to any one of claims 12 to 17, It is characterized in that The communication unit is also used for: receiving a third signal, where the third signal is an echo signal of the first signal; The processing unit is also used to obtain environmental perception information around the first terminal device based on the first signal and the third signal.

19. The device according to claim 18, It is characterized in that The communication unit is specifically used for: The third signal is received within a first time range; a starting position of the first time range is later than or equal to a starting position of the first symbol, and an ending position of the first time range is earlier than or equal to an ending position of the first symbol.

20. The device according to any one of claims 12 to 19, It is characterized in that The first signal is determined according to a first sequence, and the type of the first sequence includes a ZC sequence, a PN sequence, a gold sequence, or an m sequence; wherein an initial value of the first sequence is determined according to an identifier of the first terminal device.

21. The device according to claim 20, It is characterized in that The initial value of the first sequence is based on the parameter c init Determine that the parameter c init Satisfy the following form: c init =P×N UE-ID ; Wherein, P represents the identifier of the spatial area where the first terminal device is located, and N UE-ID Represents the identifier of the first terminal device.

22. The device according to claim 21, It is characterized in that The identifier of the first terminal device is different from the identifier of the second terminal device, and the first terminal device and the second terminal device are located in the same spatial area; Alternatively, the identifier of the first terminal device is the same as the identifier of the second terminal device, and the first terminal device and the second terminal device are located in different spatial areas.

23. A communication device, It is characterized in that The method comprises a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices and transmit them to the processor or send signals from the processor to other communication devices, and the processor is used to implement the method as described in any one of claims 1 to 11 through a logic circuit or by executing code instructions.

24. A computer program product, It is characterized in that The invention comprises instructions, and when the instructions are executed, the method according to any one of claims 1 to 11 is implemented.

25. A chip, It is characterized in that The chip comprises a processor, which is coupled to a memory and is used to execute a computer program or instruction stored in the memory, so that the chip implements the method described in any one of claims 1 to 11.

26. A computer-readable storage medium, It is characterized in that The storage medium stores a computer program or an instruction, and when the computer program or the instruction is executed by the communication device, the method according to any one of claims 1 to 11 is implemented.

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