Signal transmission method, communication apparatus, and communication system

Abstract

The present application provides a signal transmission method, a communication apparatus, and a communication system. The method comprises: a first communication apparatus receives a first reference signal; the first communication apparatus sends a second reference signal and a third reference signal, wherein precoding of the second reference signal or precoding of the third reference signal is obtained on the basis of the first reference signal, and the second reference signal and the third reference signal are used for determining precoding of a fourth reference signal; and the first communication apparatus receives the fourth reference signal, wherein the fourth reference signal is used for compensating for a first measurement result, and the compensated first measurement result is used for acquiring sensing parameters. In this way, the performance of sensing measurement can be improved.

Description

Signal transmission methods, communication devices and communication systems

[0001] This application claims priority to Chinese Patent Application No. 202411428846.5, filed on October 11, 2024, entitled “Signal Transmission Method, Communication Apparatus and Communication System”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, and more specifically, to a signal transmission method, a communication device, and a communication system. Background Technology

[0003] Wireless sensing refers to the ability of communication devices to send specific signals to their surroundings and receive signals reflected from the environment. By comparing the received signals with the sent signals, relevant information about the surrounding environment, as well as the device's location and movement, can be obtained. Bi-static sensing is an important sensing mode in wireless sensing. Bi-static sensing involves one device sending a signal and another device receiving the signal to sense the state of the surrounding environment or the device itself.

[0004] Communication systems are gradually evolving towards integrated communication and sensing, supporting applications such as smart cities, smart homes, and autonomous driving. Two devices in a communication system can achieve bi-base sensing by separately transmitting and receiving signals. These devices may employ time division duplexing (TDD) mode, where signal transmission and reception occur at different times. For TDD-mode communication devices, improving sensing accuracy is a crucial issue that needs to be addressed to achieve true communication and sensing integration. Summary of the Invention

[0005] This application provides a signal transmission method, communication device, and communication system that can improve the performance of sensing and measurement.

[0006] In a first aspect, a signal transmission method is provided, which may be a first communication device, which may be a communication equipment (such as a terminal) or a unit / module / component (such as a chip, chip system, logic circuit or software) that can be configured in (or used in) a communication equipment.

[0007] The method includes: a first communication device receiving a first reference signal; the first communication device transmitting a second reference signal and a third reference signal, wherein a precode of the second reference signal or a precode of the third reference signal is obtained based on the first reference signal, and the second and third reference signals are used to determine a precode of a fourth reference signal; the first communication device receiving the fourth reference signal, which is used to compensate for a first measurement result, wherein the compensated first measurement result is used to acquire sensing parameters.

[0008] According to the above scheme, by having the two communication devices that perform sensing send reference signals to each other, the first communication device can obtain the compensation amount for the sensing measurement results. After the first communication device compensates the sensing measurement results based on the phase compensation amount, it can combine the sensing signal measurement results before and after the transmission and reception mode switching to estimate the sensing parameters. This improves the accuracy of sensing parameter estimation with lower complexity and enhances the performance of sensing measurement.

[0009] In one optional implementation, the method further includes: a first communication device determining first channel information based on the first reference signal; the first communication device determining a first precoding based on the first channel information; and the first communication device transmitting a second reference signal and a third reference signal, including: the first communication device transmitting the second reference signal using the first precoding; and the first communication device transmitting the third reference signal.

[0010] The precoding of the third reference signal is 1, or no precoding is used when the third reference signal is sent.

[0011] Optionally, the first channel information includes a first channel frequency response, and the phase of the first precoding is opposite to the phase of the first channel frequency response.

[0012] In another optional implementation, the method further includes: a first communication device determining first channel information based on the first reference signal; the first communication device determining a first precoding based on the first channel information; and the first communication device transmitting a second reference signal and a third reference signal, including: the first communication device transmitting the second reference signal; and the first communication device transmitting the third reference signal using the first precoding.

[0013] The precoding of the second reference signal is 1, or no precoding is used when the second reference signal is transmitted.

[0014] Optionally, the first channel information includes a first channel frequency response, and the phase of the first precoding is the same as the phase of the first channel frequency response.

[0015] In other words, the first communication device uses a first precoding to transmit one of the second or third reference signals, while transmitting the other reference signal without using precoding (or with a precoding value of 1). This allows the reference signal transmitted using the first precoding to carry the phase difference between the first and second communication devices caused by device factors before the first transmit / receive mode switch. This ensures that subsequent processing can maintain the phase consistency between the compensated first measurement result and the measurement result obtained based on the sensing signal before the transmit / receive mode switch. Consequently, the first communication device can combine the sensing signal measurement results before and after the transmit / receive mode switch to estimate the sensing parameters, thereby improving the accuracy of sensing parameter estimation with lower complexity and enhancing the performance of sensing measurements.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, the first reference signal is received in a first time unit, the second reference signal is transmitted in a second time unit, and the first time unit and the second time unit are temporally adjacent. The third reference signal is transmitted in a third time unit, the fourth reference signal is received in a fourth time unit, and the third time unit and the fourth time unit are temporally adjacent, or the third time unit and the fourth time unit are the same time unit.

[0017] This means that since the transmission time interval between the first reference signal and the second reference signal is short, the air interface channels can be considered to be mutually exclusive. In the case of mutually exclusive air interface channels, the channel frequency responses of the air interface channels corresponding to the first reference signal and the second reference signal are the same.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: the first communication device not receiving a signal between transmitting the second reference signal and transmitting the third reference signal.

[0019] According to the above scheme, the first communication device and the second communication device need to ensure that the phase of the crystal oscillator does not change abruptly between the second reference signal and the third reference signal, that is, the crystal oscillator remains stable, so as to avoid the abrupt change in crystal oscillator phase caused by the switching between the receiving and transmitting modes.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the second reference signal and the third reference signal are used to determine the precoding of the fourth reference signal, including: the second reference signal is used to determine second channel information, the third reference signal is used to determine third channel information, and the precoding of the fourth reference signal is a second precoding, which is determined based on the second channel information and the third channel information.

[0021] In other words, the second communication device determines the second precoding based on the second channel information and the third channel information, and uses the second precoding to transmit the fourth reference signal, so that the first communication device can obtain the compensation amount based on the fourth reference signal. This is used to compensate for the measurement results of the sensed signal.

[0022] In conjunction with the first aspect, in some implementations of the first aspect, the second channel information includes a second channel frequency response, the third channel information includes a third channel frequency response, and the phase of the second precoding is equal to the phase difference between the phase of the second channel frequency response and the phase of the third channel frequency response.

[0023] According to the above scheme, the phase of the second precoding is equal to the phase difference between the phase of the second channel frequency response and the phase of the third channel frequency response. This ensures that the fourth channel information acquired by the first communication device only carries the phase difference caused by device factors before and after the two transmit / receive mode switches, while the phase difference caused by device factors between the two transmit / receive mode switches is canceled out.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: the first communication device determining fourth channel information based on the fourth reference signal; and the first communication device compensating for the first measurement result based on the fourth channel information.

[0025] In conjunction with the first aspect, in some implementations of the first aspect, the fourth channel information includes a fourth channel frequency response, the first measurement result includes a fifth channel frequency response, the compensated first measurement result includes a sixth frequency channel response coefficient, the phase of the sixth frequency channel response coefficient is equal to the phase difference between the phase of the fifth channel frequency response and the phase of the fourth channel frequency response, and the sixth frequency channel response coefficient is used to obtain the sensing parameter.

[0026] According to the above scheme, by compensating the first measurement result based on the frequency response of the fourth channel, the phase difference caused by device factors after the two transmit / receive mode switching carried by the first measurement result can be canceled out. This ensures that the phase of the compensated first measurement result is consistent with the phase of the measurement result obtained based on the sensing signal before the transmit / receive mode switching. As a result, the first communication device can combine the sensing signal measurement results before and after the transmit / receive mode switching to estimate the sensing parameters. This improves the accuracy of sensing parameter estimation with lower complexity and enhances the performance of sensing measurement.

[0027] In conjunction with the first aspect, in some implementations of the first aspect, the first measurement result is obtained by measuring a first sensed signal, the frequency domain density of which is a first frequency domain density, which is greater than a second frequency domain density, and the second frequency domain density is the frequency domain density of one or more of the following reference signals:

[0028] The first reference signal, the third reference signal, the second reference signal, or the fourth reference signal.

[0029] According to the above scheme, the reference signal used to obtain the phase compensation amount is transmitted at a lower density, which occupies less wireless resources and can improve resource utilization.

[0030] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: a first communication device receiving first configuration information, the first configuration information being used to configure a first reference signal resource, a second reference signal resource, a third reference signal resource, and a fourth reference signal resource; wherein the first configuration information includes first indication information, the first indication information being used to indicate the resource mapping style of the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource, the first reference signal resource being used to transmit the first reference signal, the second reference signal resource being used to transmit the second reference signal, the third reference signal resource being used to transmit the third reference signal, and the fourth reference signal resource being used to transmit the fourth reference signal.

[0031] In conjunction with the first aspect, in some implementations of the first aspect, the first configuration information is used to configure a set of reference signal resources, which includes the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource.

[0032] The reference signal resource set further includes a first sensing signal resource; or, the method further includes: receiving second indication information, the second indication information being used to indicate that the reference signal resource set is associated with the first sensing signal resource.

[0033] The first sensing signal resource is used to transmit the first sensing signal, and the first measurement result is obtained by measuring the first sensing signal.

[0034] According to the above scheme, the first communication device can determine the first sensing signal resource and the set of reference signal resources for obtaining the compensation amount based on the first configuration information. Alternatively, it can determine the correlation between the reference signal set configured in the first configuration information and the first sensing signal resource through the second indication information, and the compensation amount obtained based on the reference signal set is used to compensate the measurement result obtained based on the first sensing signal measurement. This enables the first communication device and the second communication device to reach a consensus on the reference signal set.

[0035] In conjunction with the first aspect, in some implementations of the first aspect, the method further includes: a first communication device receiving second configuration information, the second configuration information being used to configure a first time domain pattern, the first time domain pattern being used to indicate at least one time unit among a transmission time unit, a reception time unit, or a mixed time unit.

[0036] Wherein, the first reference signal is received in a first time unit, which is the last time unit in the first time domain pattern before the receiving time unit switches to the transmitting time unit, or the first time unit is a mixed time unit before the switching to the transmitting time unit; and / or,

[0037] The second reference signal is transmitted in a second time unit, which is the first time unit after the switch from the receive time unit to the transmit time unit in the first time domain pattern, or the second time unit is a mixed time unit before the transmit time unit at the time of the switch; and / or,

[0038] The third reference signal is transmitted in a third time unit, which is the last time unit in the first time domain pattern before the transmission time unit switches to the reception time unit, or the third time unit is a mixed time unit before the switch to the reception time unit; and / or,

[0039] The fourth reference signal is received in the fourth time unit, which is the first time unit after the transmission time unit in the first time domain pattern switches to the reception time unit, or the third time unit is a mixed time unit before the switch to the reception time unit.

[0040] According to the above scheme, the first time-domain pattern is used to indicate the distribution of receiving time units and transmitting time units, or to indicate the distribution of receiving sub-time units and transmitting sub-time units in receiving time units, transmitting time units, and mixed time units (or special time units). The first communication device can determine the time units where the first reference signal to the fourth reference signal are located based on the first time-domain pattern without indicating them through signaling, thereby reducing signaling overhead.

[0041] In conjunction with the first aspect, in some implementations of the first aspect, the first communication device is applied to a terminal, the receiving time unit is a downlink time unit, and the transmitting time unit is an uplink time unit.

[0042] In conjunction with the first aspect, in certain implementations of the first aspect, the first indication information is used to indicate the position of the sub-time unit used to carry the target reference signal within the target time unit. The target reference signal is the first reference signal, and the target time unit is the first time unit; and / or, the target reference signal is the second reference signal, and the target time unit is the second time unit; and / or, the target reference signal is the third reference signal, and the target time unit is the third time unit; and / or, the target reference signal is the fourth reference signal, and the target time unit is the fourth time unit.

[0043] According to the above scheme, the first indication information can specifically indicate the position of the sub-time unit used to carry the target reference signal within the time unit where the target reference signal is located, so that the first communication device can determine the sub-time unit used to carry the target reference signal based on the first indication information. That is, the sub-time unit where the reference signal resource of the target reference signal is located.

[0044] Secondly, a signal transmission method is provided, which can be a second communication device, which can be a communication device (such as a terminal or network device) or a unit / module / component (such as a chip, chip system, logic circuit or software) that can be configured into (or used in) a communication device.

[0045] The method includes: a second communication device transmitting a first reference signal, the first reference signal being used to determine a precode for a second reference signal, or the first reference signal being used to determine a precode for a third reference signal. The second communication device receives the second reference signal and the third reference signal. The second communication device transmits a fourth reference signal, the precode of which is obtained based on the second reference signal and the third reference signal, the fourth reference signal being used to compensate for a first measurement result, the compensated first measurement result being used to acquire sensing parameters.

[0046] In conjunction with the second aspect, in some implementations of the second aspect, the first reference signal is used to determine the precoding of the second reference signal, including: the first reference signal is used to determine first channel information, the precoding of the second reference signal is a first precoding, and the first precoding is determined based on the first channel information.

[0047] In conjunction with the second aspect, in some implementations of the second aspect, the first reference signal is used to determine the precoding of the third reference signal, including: the first reference signal is used to determine first channel information, the precoding of the second reference signal is a first precoding, and the first precoding is determined based on the first channel information.

[0048] In conjunction with the second aspect, in some implementations of the second aspect, the first channel information includes a first channel frequency response, and the phase of the first precoding is opposite to the phase of the first channel frequency response.

[0049] In conjunction with the second aspect, in some implementations of the second aspect, the first reference signal is used to determine the precoding of the third reference signal, including: the first reference signal is used to determine first channel information, the precoding of the second reference signal is a first precoding, and the first precoding is determined based on the first channel information.

[0050] In conjunction with the second aspect, in some implementations of the second aspect, the first channel information includes a first channel frequency response, and the phase of the first precoding is the same as the phase of the first channel frequency response.

[0051] In conjunction with the second aspect, in some implementations of the second aspect, the first reference signal is transmitted in a first time unit, the second reference signal is received in a second time unit, and the first time unit and the second time unit are temporally adjacent, or the first time unit and the second time unit are the same time unit. The third reference signal is received in a third time unit, the fourth reference signal is transmitted in a fourth time unit, and the third time unit and the fourth time unit are temporally adjacent, or the third time unit and the fourth time unit are the same time unit.

[0052] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes: the second communication device not receiving signals between receiving the second reference signal and receiving the third reference signal.

[0053] In conjunction with the second aspect, in certain implementations of the second aspect, the second communication device transmits a fourth reference signal, comprising: the second communication device determining a second precode based on second channel information and third channel information, wherein the second channel information is determined based on the second reference signal and the third channel information is determined based on the third reference signal; and the second communication device uses the second precode to transmit the fourth reference signal.

[0054] In conjunction with the second aspect, in some implementations of the second aspect, the second channel information includes a second channel frequency response, the third channel information includes a third channel frequency response, and the phase of the second precoding is equal to the phase difference between the phase of the second channel frequency response and the phase of the third channel frequency response.

[0055] In conjunction with the second aspect, in some implementations of the second aspect, the fourth reference signal is used to determine fourth channel information, which is used to compensate for the first measurement result.

[0056] In conjunction with the second aspect, in some implementations of the second aspect, the fourth channel information includes the fourth channel frequency response, the first measurement result includes the fifth channel frequency response, the compensated first measurement result includes the sixth frequency channel response coefficient, the phase of the sixth frequency channel response coefficient is equal to the phase difference between the phase of the fifth channel frequency response and the phase of the fourth channel frequency response, and the sixth frequency channel response coefficient is used to obtain the sensing parameter.

[0057] In conjunction with the second aspect, in some implementations of the second aspect, a first sensing signal is used to acquire the first measurement result, the frequency domain density of the first sensing signal is a first frequency domain density, the first frequency domain density is greater than a second frequency domain density, and the second frequency domain density is the frequency domain density of one or more of the following reference signals:

[0058] The first reference signal, the third reference signal, the second reference signal, or the fourth reference signal.

[0059] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes: a second communication device sending first configuration information, the first configuration information being used to configure a first reference signal resource, a second reference signal resource, a third reference signal resource, and a fourth reference signal resource; wherein the first configuration information includes first indication information, the first indication information being used to indicate the resource mapping style of the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource, the first reference signal resource being used to send the first reference signal, the second reference signal resource being used to send the second reference signal, the third reference signal resource being used to send the third reference signal, and the fourth reference signal resource being used to send the fourth reference signal.

[0060] In conjunction with the second aspect, in some implementations of the second aspect, the first configuration information is used to configure a set of reference signal resources, which includes the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource;

[0061] The reference signal resource set also includes a first sensing signal resource; or, the method further includes: sending a second indication message, the second indication message being used to indicate that the reference signal resource set is associated with the first sensing signal resource.

[0062] The first sensing signal resource is used to transmit the first sensing signal, and the first measurement result is obtained by measuring the first sensing signal.

[0063] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes: a second communication device sending second configuration information, the second configuration information being used to configure a first time domain pattern, the first time domain pattern being used to indicate at least one time unit among a transmission time unit, a reception time unit, or a mixed time unit.

[0064] Wherein, the first reference signal is transmitted in a first time unit, which is the last time unit in the first time domain pattern before the transmission time unit switches to the reception time unit, or the first time unit is a mixed time unit before the switch to the reception time unit; and / or,

[0065] The second reference signal is received in a second time unit, which is the first time unit after the transmission time unit in the first time domain pattern switches to the reception time unit, or the second time unit is a mixed time unit before the switch to the reception time unit; and / or,

[0066] The third reference signal is received in a third time unit, which is the last time unit in the first time domain pattern before the receiving time unit switches to the transmitting time unit, or the third time unit is a mixed time unit before the switch to the transmitting time unit; and / or,

[0067] The fourth reference signal is transmitted in the fourth time unit, which is the first time unit after the receiving time unit in the first time domain pattern switches to the transmitting time unit, or the fourth time unit is a mixed time unit before the switching to the transmitting time unit.

[0068] In conjunction with the second aspect, in some implementations of the second aspect, the second communication device is applied to a network device, the receiving time unit is an uplink time unit, and the transmitting time unit is a downlink time unit.

[0069] In conjunction with the second aspect, in certain implementations of the second aspect, the first indication information is used to indicate the position of the sub-time unit carrying the target reference signal within the target time unit. The target reference signal is the first reference signal, and the target time unit is the first time unit; and / or, the target reference signal is the second reference signal, and the target time unit is the second time unit; and / or, the target reference signal is the third reference signal, and the target time unit is the third time unit; and / or, the target reference signal is the fourth reference signal, and the target time unit is the fourth time unit.

[0070] Thirdly, a communication device is provided. In one design, the device may include modules corresponding to the methods / operations / steps / actions described in the first aspect or any embodiment of the first aspect. These modules may be hardware circuits, software, or a combination of hardware circuits and software. In one design, the device includes: a transceiver unit for receiving a first reference signal; the transceiver unit is further configured to transmit a second reference signal and a third reference signal, wherein the precoding of the second reference signal or the precoding of the third reference signal is obtained based on the first reference signal, and the second and third reference signals are used to determine the precoding of a fourth reference signal; the transceiver unit is also configured to receive the fourth reference signal. A processing unit 810 is configured to compensate a first measurement result based on the fourth reference signal, wherein the compensated first measurement result is used to acquire sensing parameters.

[0071] Fourthly, a communication device is provided. In one design, the device may include modules corresponding to the methods / operations / steps / actions described in the second aspect or any embodiment of the second aspect. These modules may be hardware circuits, software, or a combination of hardware circuits and software. In one design, the device includes: a transceiver unit configured to transmit a first reference signal, which is used to determine the precoding of a second reference signal, or the first reference signal is used to determine the precoding of a third reference signal. The transceiver unit is configured to receive the second reference signal and the third reference signal. A processing unit is configured to precode a fourth reference signal obtained based on the second and third reference signals. The transceiver unit is further configured to transmit the fourth reference signal, which is used to compensate for a first measurement result, and the compensated first measurement result is used to acquire sensing parameters.

[0072] Fifthly, a communication device is provided, including a processor. The processor can implement the methods of the first to sixth aspects and any possible implementations thereof. Optionally, the communication device further includes a memory, and the processor is coupled to the memory and can be used to execute instructions in the memory to implement the methods of the first or second aspect and any possible implementations thereof. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface. In the embodiments of this application, the communication interface may be a transceiver, a pin, a circuit, a bus, a module, or other types of communication interface, and is not limited thereto.

[0073] In one implementation, the communication device is a communication equipment (such as a terminal device or access network equipment). When the communication device is a communication equipment, the communication interface can be a transceiver, or an input / output interface.

[0074] In another implementation, the communication device is a chip configured within a communication device. When the communication device is a chip configured within a communication device, the communication interface can be an input / output interface.

[0075] Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0076] A sixth aspect provides a processor, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to execute the methods described in the first or second aspect and any possible implementation thereof.

[0077] In specific implementation, the processor can be one or more chips, the input circuit can be input pins, the output circuit can be output pins, and the processing circuit can be transistors, gate circuits, flip-flops, and various logic circuits. The input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit can be, for example, but not limited to, output to and transmitted by a transmitter. Furthermore, the input circuit and the output circuit can be the same circuit, which is used as both the input circuit and the output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

[0078] In a seventh aspect, a computer program product is provided, comprising: a computer program (also referred to as code or instructions) that, when run, causes a computer to perform the methods described in the first or second aspect and any possible implementation thereof.

[0079] Eighthly, a computer-readable storage medium is provided that stores a computer program (also referred to as code or instructions) that, when executed on a computer, causes the computer to perform the methods of the first or second aspect and any possible implementation thereof.

[0080] In a ninth aspect, a communication system is provided, comprising at least one first communication device and at least one second communication device as described above.

[0081] It should be understood that the beneficial effects of the features corresponding to the first aspect in the second to ninth aspects can be referred to the relevant description of the first aspect above, and will not be repeated here. Attached Figure Description

[0082] Figure 1 is a schematic diagram of a communication system architecture applicable to an embodiment of this application;

[0083] Figure 2 is a schematic diagram of the transmission of sensing signals based on resource map according to an embodiment of this application;

[0084] Figure 3 is a schematic flowchart of a signal transmission method provided in an embodiment of this application;

[0085] Figure 4 is a schematic diagram of transmitting a first reference signal and transmitting a second reference signal according to an embodiment of this application;

[0086] Figure 5 is a schematic diagram of a signal transmission method provided in an embodiment of this application;

[0087] Figure 6 is another schematic diagram of the signal transmission method provided in an embodiment of this application;

[0088] Figure 7 is another schematic diagram of transmitting a first reference signal and transmitting a second reference signal provided in an embodiment of this application;

[0089] Figure 8 is a schematic block diagram of a communication device provided in an embodiment of this application;

[0090] Figure 9 is another schematic structural diagram of the communication device provided in the embodiments of this application. Detailed Implementation

[0091] To facilitate understanding of the embodiments of this application, the following description is provided first:

[0092] In this application, "instruction" can include direct instruction, indirect instruction, explicit instruction, and implicit instruction. When describing a certain instruction information for the purpose of instructing A, it can be understood that the instruction information carries A, directly instructs A, or indirectly instructs A.

[0093] In this application, " / " can indicate that the objects before and after are in an "or" relationship. For example, A / B can mean A or B. "And / or" can be used to describe three relationships between the related objects. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural.

[0094] In this application, "at least one" means one or more, and "more than one" means two or more, such as three, four, or more. Similar expressions (such as at least one, at least one, etc.) are used in the same way. "At least one of the following," "one or more of the following," or similar expressions refer to any combination of these items, which may include only a single item or a combination of multiple items. For example, at least one of a, b, or c can mean: a, or b, or c; a and b; or a and c; or b and c; or a, b, and c. Where a, b, and c can be single or multiple.

[0095] In this application, for the convenience of describing the technical solutions of the embodiments of this application, the terms "first" and "second" may be used to distinguish them. The terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0096] In this application, the words "exemplary," "example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "example," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. The use of the words "exemplary," "example," or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0097] In this application, "sending information / data" only indicates the direction of information / data transmission, including direct transmission via the device's communication interface (such as an air interface, or simply air interface). "Sending" can also be understood as the "output" of a module interface. "Sending" can include indirect transmission by the processing unit through the communication interface, meaning that after the processing unit outputs information / data through the module interface, it is transmitted to the device's communication interface and then sent out. "Receiving information / data" only indicates the direction of information / data transmission, including direct reception via the communication interface. "Receiving" can also be understood as the "input" of a module interface. "Receiving information / data" can include indirect reception by the processing unit through the communication interface, meaning that after the communication interface receives information / data, it is transmitted to the processing unit's module interface and then input to the processing unit. "Sending information / data to… (such as a terminal)" can be understood as the destination of the information being the terminal. It can include sending information / data directly or indirectly to the terminal. "Receiving information / data from… (such as a terminal)" can be understood as the source of the information being the terminal, and can include receiving information / data directly or indirectly from the terminal. Information / data may undergo necessary processing, such as format changes, between the source and destination, but the destination can understand the valid information / data from the source. Similar statements in this application can be understood in a similar way, and will not be repeated here.

[0098] The technical solutions of this application can be applied to various communication systems, such as Long Term Evolution (LTE) systems, 5th Generation (5G) communication systems, satellite communication systems, Wireless Fidelity (WiFi) systems, and the solutions provided in this application can also be applied to future communication systems or other communication systems. This application does not limit these applications.

[0099] Figure 1 illustrates another possible, non-limiting system diagram. As shown in Figure 1, the communication system 10 includes a radio access network (RAN) 100, a core network (CN) 200, and a data network (DN) 300. RAN 100 includes at least one RAN node (110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal (120a-120j in Figure 1, collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). Terminal 120 is wirelessly connected to RAN node 110. Access network node (or RAN node) 110 is wirelessly or wired connected to core network 200. The core network equipment in core network 200 and access network node 110 in RAN 100 can be different physical devices, or they can be the same physical device integrating core network logical functions and radio access network logical functions.

[0100] RAN 100 can be a cellular system related to the 3rd Generation Partnership Project (3GPP), such as 4G, 5G mobile communication systems, or future evolution systems. RAN 100 can also be an open RAN (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. RAN 100 can also be a communication system that integrates two or more of the above systems.

[0101] Access network node 110, sometimes also referred to as access network equipment, RAN entity, or access node, constitutes part of the communication system and is used to help terminals achieve wireless access. Multiple access network nodes 110 in communication system 10 can be of the same type or different types. In some scenarios, the roles of access network node 110 and terminal 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminals 120j accessing RAN 100 through network element 120i, network element 120i is a base station; but for base station 110a, network element 120i is a terminal. Access network node 110 and terminal 120 are sometimes both referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functions, and network elements 120a-120j can be understood as communication devices with terminal functions.

[0102] In one possible scenario, the access network node can be a base station, such as an evolved NodeB (eNodeB), a next-generation NodeB (gNB), or a base station in a future mobile communication system. The access network node can be a macro base station (as shown in Figure 1, 110a), a micro base station or indoor station (as shown in Figure 1, 110b), a relay node or donor node, or a radio controller in a CRAN scenario. Alternatively, the access network node can be an access point (AP), a transmission reception point (TRP), or an access node in a WiFi system. Optionally, the access network node can also be a server, a wearable device, a vehicle, or in-vehicle equipment. For example, the access network device in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). All or part of the functions of the access network node in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (e.g., a cloud platform). The access network node in this application may also be a logical node, logical module, or software that can implement all or part of the functions of the access network node.

[0103] In another possible scenario, multiple access network nodes collaborate to assist the terminal in achieving wireless access, with each access network node performing a portion of the base station's functions. For example, access network nodes can be central units (CUs), distributed units (DUs), CU-control plane (CPs), CU-user plane (UPs), or radio units (RUs), etc. CUs and DUs can be set up separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio frequency equipment or radio frequency units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs).

[0104] A terminal can also be called a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used for communication in various scenarios. These scenarios include, but are not limited to, at least one of the following: enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communications (mMTC), D2D, V2X, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearables, intelligent transportation, sensing terminals, terminals integrating communication and sensing, or smart cities, etc. Terminals can be mobile phones (as shown in Figure 1, 120a, 120j, and 120e), tablets, computers with wireless transceiver capabilities (as shown in Figure 1, 120g), customer-premises equipment (CPE), point-of-sale (POS) machines, wearable devices, vehicles (as shown in Figure 1, 120b), drones, helicopters, airplanes (as shown in Figure 1, 120i), ships, robots, robotic arms, sensors, detectors, or smart home devices (as shown in Figure 1, 120h), etc.

[0105] In some sensing applications, such as Doppler estimation, respiration estimation, and heartbeat estimation, it is usually necessary to extract the corresponding sensing parameters based on the phase changes of the signal at different times. These sensing parameters may include Doppler frequency, the device's own speed, the vital signs corresponding to respiration, and the vital signs corresponding to heartbeat.

[0106] However, if at least one of the communication devices in a bipolar sensing communication system adopts TDD mode, the device needs to switch between transmit and receive modes in time. During this switching process, the phase of the crystal oscillator may randomly change, and the transmission delay of the signal transmission channel in the device may also change. This results in the received signal phase change including not only phase changes caused by the signal transmission environment (such as device movement and object movement in the environment) but also random phase changes caused by the device components. This will lead to inaccurate sensing parameters.

[0107] The following explanation uses a base station and a terminal as an example. In scenarios where the base station and terminal communicate, to ensure the orderly reception and transmission of communication data / signaling, the base station configures a TDD resource pattern for the terminal, with uplink and downlink resources alternating. Figure 2 shows a partial TDD resource pattern between the base station and the terminal, where D represents a downlink (D) time slot and U represents an uplink (U) time slot. This TDD resource pattern is called DDDDU, meaning that four consecutive downlink time slots are followed by one uplink time slot, and this pattern is repeated. To achieve sensing measurement, the base station can send sensing signals to the terminal in multiple downlink time slots. The terminal receives the sensing signals to obtain the frequency response of the channel through which the sensing signals pass. By obtaining the frequency response in different time slots, the sensing parameters are estimated. For example, the base station sends sensing signals to the terminal in the first four downlink time slots. The terminal can measure each signal and obtain the channel information corresponding to each signal. The channel frequency response measured by the terminal includes not only the frequency response of the wireless channel the signal has experienced, but also the phase difference of the crystal oscillators of the devices (base station and terminal) (which may include the phase difference caused by synchronization error). For example, the frequency responses of the wireless channel obtained in the four time slots are denoted as H1 to H4, and the phase difference of the crystal oscillator of the base station... Phase with the terminal crystal oscillator The phase difference between them is If the base station and terminal can guarantee the phase stability of the crystal oscillator during the first four downlink time slots, then the channel frequency response measured during these four downlink time slots can be expressed as follows: and In other words, there is a fixed phase offset in the channel frequency response of each downlink time slot, which is equal to the phase difference between the crystal oscillators of the base station and the terminal. Since the phase offset is fixed, it does not affect the estimation of sensing parameters. For example, when estimating Doppler frequency based on the frequency response (including amplitude and phase) obtained from different downlink time slots, the obtained Doppler frequency spectrum is the true Doppler frequency spectrum multiplied by the aforementioned phase offset. When estimating Doppler frequency based on the Doppler frequency spectrum, only the amplitude information of that Doppler frequency spectrum is typically used; therefore, the phase offset does not affect the estimation result. Generally, the estimation accuracy of sensing parameters is proportional to the monitoring duration. To obtain more accurate sensing parameters, the terminal needs to measure sensing signals in more downlink time slots. When encountering an uplink time slot, it needs to wait for the next downlink time slot to continue monitoring. As shown in Figure 2, the 5th time slot is an uplink time slot. The terminal needs to switch from receive mode to transmit mode at the boundary between the 4th and 5th time slots, and then switch back to receive mode at the boundary between the 5th and 6th time slots. In the 6th time slot, the terminal can continue to measure sensing signals from the base station. However, due to the switching between transmit and receive modes, the phase of the terminal's crystal oscillator is difficult to maintain stability. Therefore, in the 6th time slot, the phase of the terminal's crystal oscillator changes from... Become The channel frequency response measured by the terminal in the 6th time slot is H6 represents the frequency response of the wireless channel in the 6th time slot. This causes the phase shift caused by the phase difference between the crystal oscillator of the base station and the terminal to be different in the 6th time slot compared to the previous 4 time slots. In this case, the terminal will combine the channel frequency response measured in the 6th time slot with the channel frequency response obtained in the previous 4 time slots to estimate the sensing parameters, which will lead to inaccurate sensing parameters.

[0108] To address the aforementioned issues, this application proposes that two communication devices performing bi-base sensing can mutually transmit reference signals at the boundary between the receiving and transmitting modes to obtain a phase compensation amount. Based on this phase compensation amount, phase compensation is achieved, enabling the communication devices to combine the sensing signal measurement results before and after the receiving and transmitting modes to estimate the sensing parameters, thereby improving the accuracy of sensing parameter estimation with lower complexity.

[0109] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0110] In the embodiments of this application, the following description uses a first communication device and a second communication device as the executing entities. Both the first and second communication devices can be terminals, or both can be network devices, or the first and second communication devices can be a terminal and a network device, respectively. Alternatively, the first and second communication devices can be modules (such as chips, logic circuits, or chip systems) configurable in (or usable in) terminals and / or network devices.

[0111] When the first and second communication devices are modules in a terminal and / or network device, receiving / transmitting can be understood as input / output, meaning that the module communicates with other modules or components of the terminal or network device. Furthermore, the operation performed by a single execution entity can also be divided into operations performed by multiple execution entities, which can be logically and / or physically separated. For example, the processing performed by a network device can be divided into operations performed by at least one of CU, DU, RU, etc.

[0112] It should be understood that, in the embodiments of this application, for ease of understanding, the first communication device and the second communication device are often used as examples of terminals and network devices, respectively. As explained above, the implementation of the first communication device and the second communication device is not limited to this.

[0113] Figure 3 is a schematic flowchart of the signal transmission method provided in an embodiment of this application. In the example shown in Figure 3, the second communication device sends multiple sensing signals to the first communication device. The first communication device obtains sensing parameters by measuring the multiple sensing signals from the second communication device. When there is a transmission / reception mode switch between the multiple sensing signals, the first and second communication devices can execute the method provided in the embodiment shown in Figure 3 to enable the first communication device to determine a phase compensation amount. Based on this phase compensation amount, phase compensation is performed on the measurement results obtained after the transmission / reception mode switch, and then combined with the measurement results obtained before the transmission / reception mode switch to estimate the sensing parameters. This improves the accuracy of the sensing parameter estimation.

[0114] The method includes, but is not limited to, the following steps S301 to S303.

[0115] S301, the second communication device sends a first reference signal to the first communication device.

[0116] Accordingly, the first communication device receives a first reference signal from the second communication device.

[0117] Specifically, the first reference signal is transmitted in the first time unit. The second communication device transmits the first reference signal to the first communication device in the first time unit.

[0118] In one optional implementation, the first time unit is the transmission time unit of the second communication device and the reception time unit of the first communication device.

[0119] Furthermore, the first time unit is the last transmission time unit at the switching point between the transmission time unit and the reception time unit of the second communication device. That is, the first time unit is the last reception time unit at the switching point between the reception time unit and the transmission time unit of the first communication device.

[0120] For example, if the first communication device is a terminal and the second communication device is a network device, then the first time unit is the last downlink time unit before the downlink time unit switches to the uplink time unit.

[0121] In another optional implementation, the first time unit is a hybrid time unit or a special time unit, comprising multiple sub-time units. At least two of these sub-time units have opposite transmission directions (receive or transmit) for the same communication device (either the first or second communication device). For example, the first K sub-time units in the first time unit are the transmitting sub-time units of the second communication device and the receiving sub-time units of the first communication device, while the last L sub-time units in the first time unit are the receiving sub-time units of the second communication device and the transmitting sub-time units of the first communication device. Specifically, the first reference signal is transmitted by the second communication device in one of the first K sub-time units of the first time unit.

[0122] For example, in the embodiments of this application, a time unit may be a time slot, a subframe, or a frame. A time unit may include a first time unit, and the second, third, and fourth time units described below.

[0123] Optionally, a time unit may include multiple sub-time units, and a reference signal transmitted within a time unit may be carried on one of the sub-time units of that time unit. For example, the reference signal may include a first reference signal, and the second, third, and fourth reference signals described below.

[0124] Optionally, the frequency domain may include multiple frequency domain units, and the reference signal may occupy one or more frequency domain units.

[0125] For example, in an orthogonal frequency-division multiplexing (OFDM) system, the time unit can be a time slot, the sub-time unit can be an OFDM symbol, and the frequency domain unit is a subcarrier.

[0126] In this embodiment, the reference signal can be determined based on a predefined sequence and information such as the location of the time-domain and / or frequency-domain resources occupied by the reference signal. The first communication device and the second communication device reach a consensus on the method for determining the reference signal. For example, the first communication device and the second communication device can reach a consensus on the method for determining the reference signal through protocol predefinition and / or signaling interaction.

[0127] Optionally, the second communication device may not use precoding when transmitting the first reference signal, or the precoding may be set to 1.

[0128] S302, the first communication device sends a second reference signal and a third reference signal to the second communication device. The precoding of the second reference signal or the precoding of the third reference signal is determined based on the first reference signal.

[0129] Accordingly, the second communication device receives a second reference signal and a third reference signal from the first communication device.

[0130] The first communication device may transmit a second reference signal or a third reference signal using a first precode, wherein the first precode is determined based on the first reference signal. The following descriptions, using Embodiment 1 and Embodiment 2, will illustrate this further.

[0131] In one embodiment, a first communication device sends a second reference signal and a third reference signal to a second communication device, including: the first communication device sending the second reference signal using a first precoding, and the first communication device sending the third reference signal, wherein the first communication device does not use precoding when sending the third reference signal or the precoding of the third reference signal is 1.

[0132] The precoding of the second reference signal is determined based on the first reference signal, including: the first communication device determining first channel information based on the first reference signal; the first communication device determining a first precoding based on the first channel information; and the first communication device transmitting the second reference signal to the second communication device, including: the first communication device transmitting the second reference signal using the first precoding.

[0133] The first channel information determined by the first communication device based on the first reference signal includes a first channel frequency response, and the phase of the first pre-coded signal is opposite to the phase of the first channel frequency response.

[0134] For example, if the first reference signal occupies at least one frequency domain unit, then the first communication device determines, based on the first reference signal, that the first channel information includes the channel frequency response corresponding to each of the at least one frequency domain unit, where the channel frequency response corresponding to frequency domain unit k (i.e., an example of the first channel frequency response) is 0. 1,k It should be understood that the following description uses frequency domain unit k as an example to illustrate the method provided in the embodiments of this application. The processing methods of other frequency domain units are the same as those of frequency domain unit k, and can be implemented with reference to the processing methods of frequency domain unit k. That is, for a certain reference signal, the corresponding operation can be performed on each of its included frequency domain units, which will not be described in detail in this application.

[0135] Channel frequency response O 1k Includes the air interface channel (i.e., wireless channel) frequency response H 1k Influence factors of the transmission channel of the device That

[0136] In this context, θ1 represents the phase difference between the first and second communication devices caused by device factors. This phase difference can include random phase differences caused by the crystal oscillators of the two communication devices, as well as phase differences caused by synchronization time differences. Generally, the random phase difference caused by the crystal oscillators is the same across all frequency domain units, while the phase difference caused by the synchronization time difference exhibits a linear relationship across all frequency domain units.

[0137] For example, the channel frequency response O 1,k It can be represented as follows:

[0138] In the above formula, we have omitted the noise and interference parts in the representation, which does not affect the core idea of ​​this application. The same applies to other places in the following text, and will not be repeated here.

[0139] Specifically, the first communication device can determine a first precode based on the first channel frequency response. The phase of the first precode is opposite to the phase of the first channel response coefficient, or in other words, the sum of the phase of the first precode and the phase of the first channel frequency response is an integer multiple of 2π (including 0).

[0140] For example, the first precoding P 1,k It can be in," * " represents the conjugate of a complex number. Or, the first precoder P 1,k It can be Where |·| represents the modulus (or magnitude) of the complex number.

[0141] The following is To illustrate, specifically, P 1,k It can be represented as follows:

[0142] The second reference signal is transmitted in the second time unit. The first communication device transmits the second reference signal to the second communication device in the second time unit.

[0143] In one optional implementation, the second time unit is the transmission time unit of the first communication device and the reception time unit of the second communication device. The first time unit and the second time unit are adjacent in time.

[0144] For example, the first reference signal can be carried in the first sub-time unit of the first time unit, and the second reference signal can be carried in the second sub-time unit of the second time unit. The first sub-time unit can be the last sub-time unit in the first time unit, and the second sub-time unit can be the first sub-time unit in the second time unit. Alternatively, the first sub-time unit can be the N1th sub-time unit from the end of the first time unit, and the second sub-time unit can be the N2th sub-time unit in the second time unit, where N1 and N2 are positive integers.

[0145] In another optional implementation, the first time unit and the second time unit are the same time unit, which is a hybrid time unit or a special time unit as described above. For example, the first K sub-time units in this time unit are the transmission sub-time units of the second communication device and the reception sub-time units of the first communication device, while the last L sub-time units in this time unit are the reception sub-time units of the second communication device and the transmission sub-time units of the first communication device. The first reference signal is carried in the first sub-time unit of the first K sub-time units in this time unit, and the second reference signal is carried in the second sub-time unit of the last L sub-time units in this time unit.

[0146] In other words, the first and second sub-time units are located near the switching point between transmit and receive modes, and they are sub-time units with opposite transmission directions (receive or transmit) for the communication devices (including the first and second communication devices). Specifically, the first sub-time unit is the transmit sub-time unit of the second communication device and the receive sub-time unit of the first communication device, and the second sub-time unit is the receive sub-time unit of the second communication device and the transmit sub-time unit of the first communication device. This allows us to assume that the air interface channels are mutually exclusive due to the short transmission time interval between the first and second reference signals. In the case of mutually exclusive air interface channels, the channel frequency responses of the air interface channels corresponding to the first and second reference signals are the same, i.e., both are H. 1,k .

[0147] The time interval between the first sub-time unit and the second sub-time unit is less than or equal to a time threshold, which is the maximum time interval assuming channel heterogeneity. Optionally, the first communication device and the second communication device can determine the positions of the first and second sub-time units through signaling interaction.

[0148] The first communication device uses a first precode to send a second reference signal to the second communication device. Specifically, the precode used for the frequency domain unit k of the second reference signal is the first precode P. 1,k .

[0149] Optionally, when the frequency domain units occupied by the first reference signal and the second reference signal are different or not completely the same, the precoding used by a frequency domain unit in the second reference signal can be determined based on the channel frequency response of the adjacent frequency domain units in the first reference signal.

[0150] For example, if the second reference signal occupies frequency domain cell l, while the first reference signal does not, and frequency domain cell k is a neighboring frequency domain cell of frequency domain cell l, then the precoding used in frequency domain cell l of the second reference signal can be determined based on the channel frequency response of frequency domain cell k of the first reference signal. Alternatively, the channel frequency response of frequency domain cell l can be estimated (e.g., by interpolation) using the values ​​of the first channel frequency response across multiple frequency domain cells, and the precoding in frequency domain cell l can be determined using the estimated channel frequency response of frequency domain cell l. Other instances where frequency domain cell misalignment may exist in this application can also be addressed using the above methods, which will not be elaborated upon here.

[0151] For example, the first communication device uses a first precode to transmit the second reference signal, indicating that when the first communication device transmits the second reference signal, it multiplies the precode by the original defined reference signal. For instance, the first and second communication devices can reach a consensus based on a predefined sequence and information such as the location of the time-domain and / or frequency-domain resources occupied by the reference signal, that a reference signal X needs to be transmitted in the second time unit and frequency unit k. 2,k Based on the above description, the first precoding in frequency domain unit k is determined to be P. 1,k Then, the signal ultimately transmitted by the first communication device in frequency domain unit k is P. 1,k X 2,k .

[0152] The second communication device receives a second reference signal in a second time unit. Based on the second reference signal, the second communication device determines second channel information, which includes a second channel frequency response. Specifically, the second channel information includes the channel frequency response of multiple frequency domain units, wherein the channel frequency response corresponding to frequency domain unit k (i.e., an example of the second channel frequency response) is 0. 2,k For example, the channel frequency response O 2,k It can be represented as follows:

[0153] Since the air interface channels corresponding to the first reference signal and the second reference signal are mutually exclusive, the channel frequency responses of the air interface channels included in the channel frequency responses corresponding to the same subcarrier are the same. That is, the frequency responses of the air interface channels corresponding to frequency domain unit k are all H. 1,kθ2 represents the phase difference between the first and second communication devices in the second time unit caused by device factors. Since the first communication device switches from receive mode to transmit mode and the second communication device switches from transmit mode to receive mode between the first and second sub-time units, the phase difference in the first and second channel frequency responses caused by device factors changes, i.e., from θ1 to θ2. This may be due to random phase jumps in the crystal oscillator and / or changes in the transmission delay of the signal transmission channel in the device. It should be noted that the channel frequency response actually measured by the communication device may also include the influence of the transceiver power amplifier, but this influence only produces a fixed amplitude effect; therefore, the amplitude change caused by this influence is ignored in the relevant description of this application.

[0154] For example, if the first communication device is a terminal and the second communication device is a network device, then the first time unit is the downlink time unit and the second time unit is the uplink time unit. As shown in Figure 4, the terminal can obtain the channel frequency response corresponding to frequency domain unit k based on the first reference signal in the downlink time unit. The terminal then determines the first precoding based on the first channel frequency response. The first precoding is then used to transmit the second reference signal. Based on the second reference signal, the network device can obtain the channel frequency response corresponding to frequency domain element k.

[0155] It is important to understand that when the second communication device receives the second reference signal, it can only know that, according to the consensus reached, the reference signal X needs to be received in the second time unit and frequency domain unit k. 2,k Since the specific first precoding used by the first communication device is unknown, the second communication device determines the second channel frequency response based on the measurement results of the received second reference signal and the consensus reference signal. Therefore, the second channel frequency response it determines includes the influence of the first precoding. For example, the second reference signal received by the second communication device is Y. 2,k Then it can be based on Y 2,k / X 2,k Determine O 2,k Other methods for determining the channel frequency response in this application embodiment are similar and will not be described in detail here.

[0156] The first communication device sends a third reference signal to the second communication device in the third time unit.

[0157] In one optional embodiment, the third time unit is the transmission time unit of the first communication device and the reception time unit of the second communication device.

[0158] Furthermore, the third time unit is the last transmission time unit at the switching point between the transmission time unit and the reception time unit of the first communication device. That is, the third time unit is the last reception time unit at the switching point between the reception time unit and the transmission time unit of the second communication device.

[0159] In another optional embodiment, the third time unit is a hybrid time unit or a special time unit, and the third reference signal is transmitted in the third sub-time unit of the third time unit. The third sub-time unit is the transmitting sub-time unit of the first communication device and the receiving sub-time unit of the second communication device.

[0160] Optionally, the first communication device needs to ensure phase consistency between transmitting the second reference signal and transmitting the third reference signal. The second communication device needs to ensure phase consistency between receiving the second reference signal and receiving the third reference signal.

[0161] For example, the first and second communication devices need to ensure that the phase of the crystal oscillator does not change abruptly between the second and third reference signals, i.e., the crystal oscillator remains stable, and / or the first and second communication devices need to ensure that the synchronization time between the second and third reference signals remains stable. For instance, the first communication device may not receive signals between transmitting the second and third reference signals; that is, the first communication device is in transmit mode between transmitting the second and third reference signals. And / or, the second communication device may not transmit signals between receiving the second and third reference signals; that is, the second communication device is in receive mode between receiving the second and third reference signals. This avoids abrupt changes in the crystal oscillator phase caused by switching between transmit and receive modes. Furthermore, the first or second communication device may use a high-specification crystal oscillator and / or clock synchronization module, enabling the communication device to maintain phase stability even when switching between transmit and receive modes.

[0162] For example, the first communication device is a terminal, the second communication device is a network device, and both the second and third sub-time units are uplink sub-time units. The second sub-time unit is where the second reference signal is located, and the third sub-time unit is where the third reference signal is located. In one implementation, both the second and third sub-time units are uplink sub-time units, and the terminal is in transmit mode between the second and third sub-time units. The network device is in receive mode between the second and third sub-time units. In another implementation, there may be downlink sub-time units between the second and third sub-time units. The network device can switch between transmit and receive modes between the second and third sub-time units, but must ensure phase consistency between the received second and third reference signals. For example, the network device can use a high-specification crystal oscillator and a clock synchronization module. The terminal can ensure that it is in transmission mode between the second and third sub-time units, and does not transmit or receive signals in the downlink sub-time units between the second and third sub-time units. This avoids the inability to guarantee the phase consistency between the transmission and reception modes caused by the terminal switching between transmission and reception modes.

[0163] When the first communication device sends the third reference signal to the second communication device in the third time unit, it does not use precoding, or the precoding is set to 1. The second communication device receives the third reference signal in the third time unit. Based on the third reference signal, the second communication device can determine third channel information, which includes the third channel frequency response. Specifically, this includes the channel frequency response corresponding to frequency domain unit k (i.e., an example of the third channel frequency response) being 0. 3,k For example, the channel frequency response O 3,k It can be represented as follows:

[0164] Among them, H 2,k This is the frequency response of the air interface channel corresponding to frequency domain unit k. Since the first and second communication devices ensure phase consistency between the second and third reference signals, therefore, O 3,k The phase difference between the first and second communication devices included is still θ2 due to device factors.

[0165] In the second embodiment, the first communication device sends a second reference signal and a third reference signal to the second communication device, including: the first communication device sends the second reference signal, wherein the first communication device does not use precoding or the precoding of the second reference signal is 1 when sending the second reference signal, and the first communication device uses the first precoding to send the third reference signal.

[0166] The first communication device transmits a second reference signal to the second communication device in a second time unit. The first communication device either does not use precoding or the precoding of the second reference signal is set to 1 when transmitting the second reference signal. Correspondingly, the second communication device receives the second reference signal from the first communication device in the second time unit. Based on the second reference signal, the second communication device determines second channel information.

[0167] For example, the frequency response O corresponding to the frequency domain unit k included in the second channel information 2,k (i.e., an example of the second channel frequency response) can be represented as follows:

[0168] Among them, H 1,k θ2 is the frequency response of the air interface channel corresponding to frequency domain unit k, and θ2 is the phase difference between the first and second communication devices in the second time unit caused by device factors.

[0169] The first communication device determines first channel information based on a first reference signal. The first communication device determines a first precoding based on the first channel information. The first communication device transmits a third reference signal to the second communication device, including: the first communication device transmitting the third reference signal using the first precoding.

[0170] The first channel information determined by the first communication device based on the first reference signal includes a first channel frequency response, and the phase of the first pre-coded signal is the same as the phase of the first channel frequency response.

[0171] The first communication device can determine a first precode based on the first channel frequency response. The phase of the first precode is the same as the phase of the first channel frequency response, or in other words, the difference between the phase of the first precode and the phase of the first channel frequency response is an integer multiple of 2π (including 0).

[0172] For example, the first precoding P 1,k It can be P 1,k =O 1,k Or, the first precoding P 1,k It can be P 1,k =O 1,k / |O 1,k |, where |·| represents the modulus (or magnitude) of the complex number.

[0173] The following uses P 1,k =O 1,k / |O 1,k To illustrate, let's take P as an example. 1,k It can be represented as follows:

[0174] The first communication device uses the first precode P in the third time unit.1,k The first communication device sends a third reference signal to the second communication device. Correspondingly, the second communication device receives the third reference signal from the first communication device in a third time unit. Based on the third reference signal, the second communication device determines the third channel information.

[0175] For example, the frequency response O corresponding to the frequency domain unit k included in the third channel information 3,k (i.e., an example of the third channel frequency response) can be represented as follows:

[0176] It is important to understand that when the first communication device uses the first precode to transmit the third reference signal, it means that the first communication device multiplies the original reference signal by the first precode when transmitting the third reference signal. For example, the first and second communication devices can reach a consensus based on a predefined sequence and information such as the location of the time-domain and / or frequency-domain resources occupied by the reference signal, to transmit the reference signal X in the third time unit and frequency unit k. 3,k Based on the above description, the first precoding in frequency domain unit k is determined to be P. 1,k Then, the signal ultimately transmitted by the first communication device in frequency domain unit k is P. 1,k X 3,k .

[0177] When the second communication device receives the third reference signal, it can only know that, according to the consensus, reference signal X needs to be received in the third time unit and frequency domain unit k. 3,k Since the specific first precoding used by the first communication device is unknown, the second communication device determines the third channel frequency response based on the measurement results of the received third reference signal and the consensus reference signal. Therefore, the determined third channel frequency response includes the influence of the first precoding. For example, the third reference signal received by the second communication device is Y. 3,k Then it can be based on Y 3,k / X 3,k Determine O 2,k .

[0178] As described above, in Embodiment 2, the transmission methods of the second and third reference signals (i.e., whether to use precoding for transmission) and the first precoding determined based on the first reference signal are different from those in Embodiment 1. Other contents (such as the positional relationship of time units) can be implemented with reference to the description in Embodiment 1, and will not be repeated here.

[0179] S303, the second communication device sends a fourth reference signal to the first communication device. The pre-coding of the fourth reference signal is obtained based on the second reference signal and the third reference signal. The fourth reference signal is used to compensate for the first measurement result, wherein the compensated first measurement result is used to obtain sensing parameters.

[0180] The second communication device can determine a second precode based on the second channel information and the third channel information. Specifically, the second communication device transmits a fourth reference signal based on the second precode. The second channel information includes the second channel frequency domain response, and the third channel information includes the third channel frequency domain response. The phase of the second precode is equal to the phase difference between the phase of the second channel frequency domain response and the phase of the third channel frequency domain response (e.g., denoted as Δθ). 23 ), or the phase of the second pre-coded value is equal to Δθ. 23 The sum of integer multiples (including 0) of 2π. Or, the phase of the second pre-coded expression with respect to Δθ. 23 The difference is an integer multiple of 2π (including 0).

[0181] Taking frequency domain unit k as an example, the second communication device can determine the channel frequency response O corresponding to frequency domain unit k based on the second reference signal. 2,k and the channel frequency response O corresponding to the frequency domain unit k obtained based on the third reference signal. 3,k Determine the second precoding P 2,k .

[0182] For example, the second communication device uses the second precode to transmit the fourth reference signal, indicating that when the second communication device transmits the fourth reference signal, it multiplies the original reference signal by the second precode. For instance, the first and second communication devices can reach a consensus based on a predefined sequence and information such as the location of the time-domain and / or frequency-domain resources occupied by the reference signal, to transmit the reference signal X in the fourth time unit and frequency unit k. 4,k Based on the above description, the second precoding on frequency domain unit k is determined to be P. 2,k Then the signal ultimately sent by the first communication device is P. 2,k X 4,k .

[0183] For example, the second precoding can be or or or The following is Let's take an example to illustrate.

[0184] In the first embodiment described above, the second channel frequency response determined by the second communication device Third Channel Frequency Response Specifically, P 2,k It can be represented as follows:

[0185] In the second embodiment described above, the second channel frequency response determined by the second communication device Third Channel Frequency Response Specifically, P 2,k It can be represented as follows:

[0186] In summary, based on the second and third channel frequency responses obtained in Implementation Method 1 and Implementation Method 2 respectively, the determined second precoding satisfies...

[0187] The fourth reference signal is transmitted in the fourth time unit. The second communication device transmits the fourth reference signal to the first communication device in the fourth time unit.

[0188] In one optional embodiment, the fourth time unit is the receiving time unit of the first communication device and the transmitting time unit of the second communication device. The third time unit and the fourth time unit are adjacent in time.

[0189] For example, the third reference signal can be carried in the third sub-time unit of the third time unit, and the fourth reference signal can be carried in the fourth sub-time unit of the fourth time unit. The third sub-time unit can be the last sub-time unit in the third time unit, and the fourth sub-time unit can be the first sub-time unit in the fourth time unit. Alternatively, the third sub-time unit can be the N3rd sub-time unit from the end of the third time unit, and the fourth sub-time unit can be the N4th sub-time unit in the fourth time unit, where N3 and N4 are positive integers.

[0190] In another optional implementation, the third time unit and the fourth time unit are the same time unit, which is the hybrid time unit or special time unit described above. The third reference signal is carried in the third sub-time unit of this time unit, which is the transmitting sub-time unit of the first communication device and the receiving sub-time unit of the second communication device. The fourth reference signal is carried in the fourth sub-time unit of this time unit, which is the receiving sub-time unit of the first communication device and the transmitting sub-time unit of the second communication device.

[0191] In other words, the third and fourth sub-time units are sub-time units near the switch between transmit and receive modes, and the third and fourth sub-time units are sub-time units with opposite transmission directions (receive or transmit) for the communication devices (including the first and second communication devices). Specifically, the third sub-time unit is the receive time unit of the second communication device and the transmit time unit of the first communication device, and the fourth sub-time unit is the transmit time unit of the second communication device and the receive time unit of the first communication device.

[0192] The third and fourth reference signals are carried in sub-time units near the transmit / receive mode switching point. This makes it possible to assume that the air interface channels are mutually exclusive due to the short transmission time interval between the third and fourth reference signals. In the case of mutually exclusive air interface channels, the frequency responses of the air interface channels corresponding to the third and fourth reference signals are the same.

[0193] The time interval between the third and fourth sub-time units is less than or equal to a time threshold, which is the maximum time interval assuming channel heterogeneity. Optionally, the first and second communication devices can determine the positions of the third and fourth sub-time units through signaling interaction.

[0194] The first communication device receives a fourth reference signal in a fourth time unit. Based on the fourth reference signal, the first communication device determines fourth channel information, which includes the fourth channel frequency response. Specifically, the fourth channel information includes the channel frequency response of multiple frequency domain units, wherein the channel frequency response corresponding to frequency domain unit k (i.e., an example of the fourth channel frequency response) is 0. 4,k For example, the channel frequency response O 4,k It can be represented as follows:

[0195] Therefore, the channel frequency response O 4,k The phase difference is the difference between θ3 and θ1, where θ1 is the phase difference caused by device factors before the two transmit / receive mode switches, i.e., the same as the phase difference caused by device factors in the measurement results obtained by the measurement sensing channel before the two transmit / receive mode switches. θ3 is the phase difference caused by device factors after the two transmit / receive mode switches, i.e., the same as the phase difference caused by device factors in the measurement results obtained by the measurement sensing channel after the two transmit / receive mode switches. Therefore, the first communication device can determine the phase difference based on the channel frequency response O. 4,k The first measurement result obtained after measuring the first sensing signal after two transmit / receive mode switches is compensated so that the phase difference caused by device factors in the compensated first measurement result is the same as the phase difference caused by device factors in the measurement result obtained before the two transmit / receive mode switches.

[0196] After receiving the fourth reference signal, the first communication device can receive the first sensing signal from the second communication device. Based on the first sensing signal, the first communication device can obtain the fifth channel information, which includes the fifth channel frequency response. Specifically, the fifth channel information includes the channel frequency response of multiple frequency domain units, where the channel frequency response corresponding to frequency domain unit k (i.e., an example of the fifth channel frequency response) is 0. 5,k For example, the channel frequency response O 5,k It can be represented as follows:

[0197] Among them, H 3,k It is the frequency response of the air interface channel, H 3,k With H 2,k They may be the same or different, depending on the transmission interval between the fourth reference signal and the first sensing signal, and whether the air interface channel changes.

[0198] The second communication device needs to ensure phase consistency between transmitting the fourth reference signal and transmitting the first sensing signal, and the first communication device needs to ensure phase consistency between receiving the fourth reference signal and receiving the first sensing signal. Therefore, the fifth channel frequency response O 5,k The frequency response of the fourth channel O 4,k The phase difference caused by device factors is the same, θ3. Since the first and second communication devices do not switch between transmit and receive modes, the phase caused by device factors can be kept stable, that is, the phase consistency between the fourth reference signal and the first sensing signal can be guaranteed.

[0199] The first communication device can respond to the channel frequency based on O. 4,k The channel frequency response O included in the first measurement result 5,k Compensation is performed to obtain the compensated channel frequency response. Specifically, the first communication device can respond to the channel frequency O based on this. 4,k Determine the phase compensation amount; for example, the phase compensation amount can be... The compensated channel frequency response It can be represented as follows:

[0200] Compensated fifth channel frequency response The phase is equal to the fifth channel frequency response O. 5,k Phase and fourth channel frequency response O 4,k The phase difference of the phase, and This can be understood as phase deviation On top of this, an air interface channel H is superimposed.3,k Therefore, the phase difference caused by device factors in the first measurement result after compensation is the same as the phase difference caused by device factors in the measurement results obtained before the two transmit / receive mode switches, both being θ1. This ensures that sensing measurements are not interrupted by transmit / receive mode switching, the communication device can reduce the impact of transmit / receive mode switching, and higher accuracy sensing parameters can be obtained by monitoring the sensing signal over a longer period.

[0201] For example, if the first communication device is a terminal and the second communication device is a network device, then the third time unit is the uplink time unit and the fourth time unit is the downlink time unit. As shown in Figure 5, the terminal and the network device transmit the first reference signal and the second reference signal in the first and second time units, respectively (for details, please refer to the previous description of the example shown in Figure 4, which will not be repeated here). In the third time unit (i.e., the last uplink time unit at the switch between the uplink and downlink time units), the terminal sends the third reference signal to the network device. Based on the third reference signal, the network device can obtain the third channel frequency response corresponding to frequency domain unit k. In the fourth time unit (i.e., the first downlink time unit at the switch from the uplink time unit to the downlink time unit), the network device uses the second precoding to send the fourth reference signal to the terminal. Based on the fourth reference signal, the terminal can obtain the fourth channel frequency response corresponding to frequency domain unit k. The network device then sends a first sensing signal to the terminal, and the first measurement result obtained by the terminal from the first sensing signal includes the fifth channel frequency response corresponding to frequency domain unit k. Terminal based on fourth channel frequency response Frequency response of the fifth channel By performing compensation, the compensated frequency response of the fifth channel can be obtained. The terminal can combine the compensated fifth signal frequency response with the channel frequency response corresponding to frequency domain unit k obtained by measuring the sensed signal in the downlink time unit before the second time unit to estimate the sensed parameters.

[0202] The above explanation uses frequency domain unit k as an example. Other frequency domain units can refer to the measurement result compensation method of frequency domain unit k for phase compensation.

[0203] The method provided in this application embodiment can be applied to the example shown in Figure 2. Specifically, near the switch from the downlink time slot (i.e., the fourth time slot) to the uplink time slot (i.e., the fifth time slot), and near the switch from the uplink time slot (i.e., the fifth time slot) to the downlink time slot (i.e., the sixth time slot), the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal are sequentially transmitted according to the method provided in this application embodiment. This allows the terminal to determine the phase compensation amount based on the fourth reference signal. Based on this phase compensation amount, the terminal determines the channel frequency response obtained from the sensing signal in the sixth time slot. Phase compensation can be performed to obtain the compensated channel frequency response. The compensated channel frequency response includes the phase offset. Since the phase offset included in the channel frequency response obtained by the terminal based on the sensing signal in the first four downlink time slots is the same, the terminal's compensated channel frequency response can be combined with the channel frequency response obtained in the first four time slots to estimate sensing parameters. This allows sensing measurements to be uninterrupted by switching between transmit and receive modes, reduces the impact of mode switching on the communication device, and enables the acquisition of more accurate sensing parameters by monitoring the sensing signal over a longer period.

[0204] Optionally, the frequency domain density of the sensed signal is a first frequency domain density, which is greater than a second frequency domain density. The second frequency domain density is the frequency domain density of one or more of the following reference signals:

[0205] First reference signal, third reference signal, second reference signal, or fourth reference signal.

[0206] In other words, the frequency domain density of the reference signal used to acquire the phase compensation amount transmitted between the first and second communication devices can be less than the frequency domain density of the sensing signal. The reference signal used to acquire the phase compensation amount includes one or more of a first reference signal, a third reference signal, a second reference signal, or a fourth reference signal. If a sensing signal occupies P frequency domain units and a reference signal used to acquire the phase compensation amount occupies Q frequency domain units, then P is greater than Q. Transmitting the reference signal used to acquire the phase compensation amount at a lower density consumes fewer wireless resources, thus improving resource utilization.

[0207] After the first communication device determines the phase compensation amount corresponding to each of the Q frequency domain units occupied by the reference signal, it can first compensate the channel frequency response corresponding to the Q frequency domain units occupied by the sensed signal. Furthermore, it can use the phase compensation amount on these Q frequency domain units to obtain the phase compensation amount on all frequency domain units, or the phase compensation amount on P frequency domain units.

[0208] For a frequency domain cell occupied by a sensing signal, such as frequency domain cell m, if the fourth reference signal does not occupy the frequency domain cell m, the terminal can determine the phase compensation amount corresponding to the frequency domain cell m based on the channel frequency response of the frequency domain cell adjacent to the frequency domain cell m and occupied by the fourth reference signal.

[0209] For example, the first communication device is a terminal, the second communication device is a network device, and the time unit is a time slot. As shown in Figure 6, the network device sends sensing signals to three terminals (terminal 1, terminal 2, and terminal 3) in each time slot from time slot n-2 to time slot n. The frequency domain density of the sensing signals of these three terminals is 1, occupying each frequency domain unit in a sub-time unit. Time slot n+1 is an uplink time slot. The network device can send the first reference signals of the three terminals to the three terminals in time slot n, and the three terminals can send their second reference signals to the network device in time slot n+1. The frequency domain density of the first reference signals of the three terminals can be less than 1, as shown in Figure 6, it can be 1 / 3. Therefore, the first reference signals of the three terminals can be frequency-division multiplexed in a sub-time unit. Similarly, the frequency domain density of the second reference signals of the three terminals can also be less than 1, thus allowing for frequency-division multiplexing in a sub-time unit. Since the reference signal used to obtain the phase compensation amount needs to be transmitted at the uplink / downlink time unit switching point, and the channel exclusivity must be guaranteed, and the resources at the uplink / downlink time unit switching point are limited, the reference signal used to obtain the phase compensation amount is transmitted at a lower density. This allows the resources at the uplink / downlink time unit switching point to support the multiplexing of reference signals from more terminals, improving resource utilization and enabling more terminals to obtain sensing parameters with higher accuracy. Similarly, the third reference signal in time slot n+1 and the fourth reference signal in time slot n+2 can also be transmitted at a lower density to improve resource utilization. The terminal can determine the phase compensation amount based on the fourth reference signal, thereby compensating the measurement results obtained from the sensing signal in time slot n+2. This ensures that the phase of the compensated channel frequency response corresponding to each frequency domain unit has the same phase offset as the phase of the channel frequency response corresponding to the corresponding frequency domain unit obtained by the terminal from measuring the sensing signal in time slots n-2 to n. Thus, the terminal can combine the compensated measurement results with the measurement results obtained in time slots n-2 to n to estimate the sensing parameters.

[0210] Optionally, prior to S301, the first communication device and the second communication device may acquire first configuration information. The first configuration information is used to configure a first reference signal resource, a second reference signal resource, a third reference signal resource, and a fourth reference signal resource. The first configuration information includes first indication information, which is used to indicate the resource mapping pattern of the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource. The first reference signal resource is used to transmit a first reference signal, the second reference signal resource is used to transmit a second reference signal, the third reference signal resource is used to transmit a third reference signal, and the fourth reference signal resource is used to transmit a fourth reference signal.

[0211] For example, the first communication device may determine the first configuration information and send it to the second communication device. Alternatively, the second communication device may determine the first configuration information and send it to the first communication device. For instance, if the first communication device is a terminal and the second communication device is a network device, the network device may determine the first configuration information and then send it to the terminal.

[0212] For example, the first communication device and the second communication device may receive the first configuration information from other communication devices. For instance, both the first and second communication devices are terminals, and the two terminals can obtain the first configuration information from the network device. This first configuration information may include first indication information, which indicates the resource mapping pattern of the first reference signal resource, the second reference signal resource, the third reference signal resource, and the fourth reference signal resource. Specifically, the resource mapping pattern may include a frequency domain resource mapping pattern and a time domain resource mapping pattern.

[0213] First, we will introduce the indication method for the frequency domain resource mapping style of the first reference signal resource, the second reference signal resource, the third reference signal resource, and the fourth reference signal resource.

[0214] For example, the first indication information can indicate the frequency domain resource mapping pattern of the first reference signal resource, the second reference signal resource, the third reference signal resource, and the fourth reference signal resource, respectively. The first indication information may include the frequency domain offset and frequency domain density corresponding to each reference signal resource, where the frequency domain offset is the offset of the first frequency domain unit occupied by the reference signal resource relative to the reference frequency domain unit. The communication device can determine the frequency domain mapping pattern of each reference signal resource based on the frequency domain offset and frequency domain density corresponding to each reference signal resource.

[0215] For example, if the four reference signal resources have the same frequency domain resource mapping pattern, the first indication information can indicate a frequency domain offset and a frequency domain density. The communication device can determine a frequency domain resource mapping pattern based on this offset and density, and the frequency domain resource mapping patterns of the first, second, third, and fourth reference signal resources will all be this frequency domain resource mapping pattern. This indication method can reduce signaling overhead.

[0216] As shown in the example in Figure 6, the network device can send configuration information 1 (i.e., an example of the first configuration information) to terminal 1 to configure the terminal 1's first reference signal resources for carrying the first reference signal, the second reference signal resources for carrying the second reference signal, the third reference signal resources for carrying the third reference signal, and the fourth reference signal resources for carrying the fourth reference signal. This configuration information 1 includes indication information 1 (i.e., an example of the first indication information), which indicates that the frequency domain offset is 0 and the frequency domain density is 1 / 3. For example, if the frequency domain unit is a subcarrier and the reference frequency domain unit is subcarrier 0, terminal 1 can determine, based on indication information 1, that the first subcarrier occupied by the reference signal resources used to obtain the phase compensation amount is offset by 0 subcarriers relative to subcarrier 0 in the frequency domain, and that every 3 subcarriers include 1 subcarrier occupied by the reference signal resources. Therefore, terminal 1 can determine that the reference signal resources occupy subcarriers 0, 3, 6, ... The network device sends configuration information 2 (another example of the first configuration information) to terminal 2. Configuration information 2 includes indication information 2 (another example of the first indication information), which indicates a frequency domain offset of 1 and a frequency domain density of 1 / 3. Terminal 2 can determine that the first subcarrier occupied by the reference signal resource has a frequency domain offset of 1 subcarrier relative to subcarrier 0, and that one subcarrier occupied by the reference signal is included in every three subcarriers. Therefore, terminal 2 can determine that the reference signal resource occupies subcarriers 1, 4, 7, ... The network device sends configuration information 3 (yet another example of the first configuration information) to terminal 3. Configuration information 3 includes indication information 3 (yet another example of the first indication information), which indicates a frequency domain offset of 0 and a frequency domain density of 1 / 3. Similarly, terminal 3 can determine that the reference signal occupies subcarriers 2, 5, 8, ...

[0217] Secondly, the indication method for the time-domain resource mapping style of the first reference signal resource, the second reference signal resource, the third reference signal resource, and the fourth reference signal resource is introduced.

[0218] In one alternative implementation, the first indication information may indicate the time-domain resource mapping style of the first reference signal resource, the second reference signal resource, the third reference signal resource, and the fourth reference signal resource, respectively.

[0219] For example, the first indication information may include an identifier for each of the first, second, third, and fourth time units. The first indication information may also indicate the position of the sub-time unit used to carry the reference signal within the time unit; for example, the first indication information may include identifiers for four sub-time units: the identifier of the first sub-time unit in the first time unit, the identifier of the second sub-time unit in the second time unit, the identifier of the third sub-time unit in the third time unit, and the identifier of the fourth sub-time unit in the fourth time unit. Alternatively, the first indication information may include four time offsets: the time offset of the first sub-time unit in the first time unit relative to the reference time unit, the time offset of the second sub-time unit in the second time unit relative to the reference time unit, the time offset of the third sub-time unit in the third time unit relative to the reference time unit, and the time offset of the fourth sub-time unit in the fourth time unit relative to the reference time unit.

[0220] In another optional implementation, the first indication information does not indicate the four time units carrying the four reference signals; these four time units can be determined based on the time-domain patterns of the receiving and transmitting time units. The first indication information can indicate the position of each of the four reference signals within its respective sub-time unit.

[0221] It should be noted that the reference signal is carried on the reference signal resource. Therefore, the resources occupied by the reference signal resource (such as frequency domain resources such as subcarriers and / or time domain resources such as time units) can be referred to as the resources occupied by the reference signal, or it can be understood that the reference signal resource includes this resource.

[0222] Optionally, prior to S301, the first and second communication devices can acquire second configuration information. This second configuration information is used to configure a first time-domain pattern. The first time-domain pattern indicates at least one time unit among transmission time units, reception time units, or mixed time units. In other words, the first time-domain pattern indicates that each time unit is a reception time unit, a transmission time unit, or a partial reception / transmission time unit (i.e., the mixed time unit or special time unit mentioned above), and which sub-time units within the partial reception / transmission time units are reception sub-time units and which are transmission sub-time units. That is, the first time-domain pattern indicates the distribution of reception and transmission time units, or the distribution of reception and transmission sub-time units within reception time units, transmission time units, and mixed time units (or special time units). Based on the first time-domain pattern, the first and / or second communication devices can determine the first, second, third, and fourth time units.

[0223] Specifically, the first reference signal is transmitted by the second communication device in the first time unit. The first time unit is the last time unit in the first time domain pattern before the first communication device switches from the receiving time unit to the transmitting time unit (i.e., the first time unit is the receiving time unit), or the first time unit is a mixed time unit before the switch to the transmitting time unit. And / or, the second reference signal is transmitted by the first communication device in the second time unit. The second time unit is the first time unit in the first time domain pattern after the first communication device switches from the receiving time unit to the transmitting time unit (i.e., the second time unit is the transmitting time unit), or the second time unit is a mixed time unit before the switch to the transmitting time unit. And / or, the third reference signal is transmitted by the first communication device in the third time unit, which is the last time unit in the first time domain pattern before the first communication device switches from the transmission time unit to the reception time unit (i.e., the third time unit is the transmission time unit), or the third time unit is a mixed time unit before the switch to the reception time unit; and / or, the fourth reference signal is received by the first communication device in the fourth time unit, which is the first time unit in the first time domain pattern after the first communication device switches from the transmission time unit to the reception time unit (i.e., the fourth time unit is the reception time unit), or the fourth time unit is a mixed time unit before the switch to the reception time unit.

[0224] For example, the first communication device is a terminal, and the second communication device is a network device. The network device can send second configuration information to the terminal, configuring the time domain patterns of uplink and downlink time units and uplink and downlink sub-time units, i.e., the first time domain pattern, through the second configuration information. If the time unit is a time slot, the terminal can determine the distribution of uplink and downlink time slots, or uplink and downlink symbols in uplink time slots, downlink time slots, and special time slots, based on the second configuration information. When the terminal is performing a sensing task, if it determines that it will switch from downlink to uplink according to the second configuration information, the terminal can determine that the last downlink time slot before switching to the uplink time slot is the downlink time slot for receiving the first reference signal, and the first uplink time slot before switching to the uplink time slot is the uplink time slot for transmitting the second reference signal. Alternatively, if the terminal determines that a special time slot will arrive before switching from the downlink time slot to the uplink time slot according to the second configuration information, the terminal can determine that it will receive the first reference signal and transmit the second reference signal in that special time slot.

[0225] After transmitting the second reference signal, the terminal determines, based on the second configuration information, that a downlink time slot or a special time slot will arrive. This allows the terminal to determine that the last uplink time slot before switching to the downlink time slot is the time slot for transmitting the third reference signal, and the first downlink time slot after switching is the downlink time slot for receiving the fourth reference signal. Alternatively, after transmitting the second reference signal, if the terminal determines, based on the second configuration information, that a special time slot will arrive before switching from the uplink time slot to the downlink time slot, the terminal can determine that the third reference signal will be transmitted and the fourth reference signal will be received during that special time slot.

[0226] As shown in the example in Figure 6, when the network device sends a sensing signal belonging to a sensing task to the terminal within at least four downlink time slots, the terminal can determine from the first time domain pattern that the uplink time slot is about to arrive and that it still needs to receive sensing signals after the uplink ends. Then, the terminal can determine the time unit for transmitting each reference signal used to obtain the phase compensation amount at the two uplink and downlink time slot switching points.

[0227] As shown in Figure 7, when the terminal is performing a sensing task, before it has fully received all the sensing signals for that task, the terminal determines that a special time slot will arrive based on the second configuration information. The first seven symbols in this special time slot are downlink symbols, and the last five symbols are uplink symbols. The symbols between the downlink and uplink symbols are not limited in this application; they can be dynamic symbols or interval symbols. If the first reference signal resource is configured or defaults to be the last downlink symbol in the special time slot, and the second reference signal resource is configured or defaults to be the first uplink symbol in the special time slot, then the terminal can determine to receive the first reference signal and transmit the second reference signal in that special time slot. For example, the first reference signal is received on symbol 6, and the second reference signal is transmitted on symbol 9. The above is only an example; the specific symbols on which the first and second reference signals are located can be determined based on the first indication information in the first configuration information.

[0228] Similarly, if the terminal determines, based on the second configuration information, that a special time slot will arrive before the uplink time slot switches to a downlink time slot, and this special time slot includes at least one uplink symbol and at least one downlink symbol, with the uplink symbol preceding the downlink symbol, and if the third reference signal resource is configured or defaults to be the last uplink symbol in the special time slot, and the fourth reference signal resource is configured or defaults to be the first downlink symbol in the special time slot, then the terminal can determine that the third reference signal is sent by the last uplink symbol in the special time slot and the fourth reference signal is received by the first downlink symbol. The above is merely an example; the specific symbols on which the third and fourth reference signals are located can be determined based on the first indication information in the first configuration information. In one embodiment, the sensing signal can be a periodic signal, that is, it appears periodically with a certain periodic duration. Since the time domain patterns of the transmit and receive time units may be different in different periods, the first communication device and the second communication device can determine whether there is a switch between transmit and receive time units in each period based on the first time domain pattern configured by the second configuration information. If there is a switch between transmit and receive time units, according to the above rules, it can be determined that the time units used to carry the first reference signal and the second reference signal are the last time unit before and after the first switch and the first time unit, respectively, and the time units used to carry the third reference signal and the fourth reference signal are the last time unit before and after the second switch and the first time unit, respectively.

[0229] Optionally, the first indication information is used to indicate the position of the sub-time unit carrying the target reference signal within the target time unit. Wherein, the target reference signal is a first reference signal, and the target time unit is a first time unit; and / or, the target reference signal is a second reference signal, and the target time unit is a second time unit; and / or, the target reference signal is a third reference signal, and the target time unit is a third time unit; and / or, the target reference signal is a fourth reference signal, and the target time unit is a fourth time unit.

[0230] The first indication information may include a time offset, which is the time offset of the sub-time unit used to carry the target reference signal relative to the reference sub-time unit in the target time unit.

[0231] For example, the reference sub-time units in the first and third time units can be predefined as the last sub-time unit capable of carrying the first and third reference signals. The reference sub-time units in the second and third time units can be the first sub-time units capable of carrying the second and fourth reference signals.

[0232] Taking the reference sub-time unit in the first time unit as an example, the reference sub-time unit in the first time unit being the last sub-time unit capable of carrying the first reference signal means that the reference sub-time unit in the first time unit is the last sub-time unit in the first time unit with the same transmission direction as the first reference signal. In other words, for the first communication device, the reference sub-time unit in the first time unit is the last receiving sub-time unit; for the second communication device, the reference sub-time unit in the first time unit is the last transmitting sub-time unit.

[0233] The first indication information includes a first time offset, which is the offset of the first sub-time unit (i.e., the sub-time unit used to carry the first reference signal) in the first time unit. According to the protocol, the reference sub-time unit in the first time unit is predefined as the last sub-time unit that can carry the first reference signal. Then the communication device can determine that the first sub-time unit is located before the last sub-time unit that can carry the first reference signal in the first time unit, and is offset by the first time offset relative to the last sub-time unit that can carry the first reference signal.

[0234] The first indication information may include the second time offset of the second sub-time unit (i.e., the sub-time unit used to carry the second reference signal) in the second time unit, the third time offset of the third sub-time unit (i.e., the sub-time unit used to carry the third reference signal) in the third time unit, and the fourth time offset of the fourth sub-time unit (i.e., the sub-time unit used to carry the fourth reference signal) in the fourth time unit. The specific determination method can be referred to the determination method of the first sub-time unit described above, and will not be repeated here.

[0235] For example, the first time offset and the second time offset indicated by the first indication information are both 0. The following explanations will be provided with reference to the examples shown in Figures 6 and 7.

[0236] In the example shown in Figure 6, the terminal can determine the downlink time slot n and uplink time slot n+1 at the uplink / downlink handover point based on the second configuration information. The last symbol in time slot n that can carry the first reference signal is the last symbol in time slot n. Therefore, the terminal can determine that the first reference signal is carried on the last symbol of time slot n based on the first time offset being 0. Similarly, the first symbol in time slot n+1 that can carry the second reference signal is the first symbol in time slot n+1. Therefore, the terminal can determine that the second reference signal is carried on the first symbol of time slot n based on the second time offset being 0.

[0237] In the example shown in Figure 7, the terminal can determine that time slot n is a special time slot based on the second configuration information. The last downlink symbol in time slot n is symbol 6. Therefore, the last symbol that can carry the first reference signal is symbol 6. The terminal can then determine that the first reference signal is carried on symbol 6 based on the first time offset being 0. The first uplink symbol in time slot n is symbol 9. Therefore, the first symbol that can carry the second reference signal is symbol 9. The terminal can then determine that the second reference signal is carried on symbol 9 based on the second time offset being 0.

[0238] The terminal can also determine the symbols carrying the third and fourth reference signals based on the third and fourth time offsets. Specific implementation can be based on the second configuration information and the two examples mentioned above; further details will not be provided here.

[0239] The first indication information may include four time offsets, which are the offsets of the four sub-time units within their respective time units. Alternatively, the first indication information may include two time offsets, where one time offset is the offset corresponding to the first and third sub-time units (i.e., the first and third time offsets are the same), and the other time offset is the offset corresponding to the second and fourth sub-time units (i.e., the second and fourth time offsets are the same). Or, the first indication information may include one time offset applicable to all four sub-time units. This application does not limit this to any particular type.

[0240] Optionally, the first configuration information is specifically used to configure a set of reference signal resources, which includes a first reference signal resource, a third reference signal resource, a second reference signal resource, and a fourth reference signal resource.

[0241] In one embodiment, the reference signal resource set further includes sensing signal resources, which are used to carry sensing signals.

[0242] In this embodiment, the first configuration information is both a sensing signal configured to acquire sensing parameters and a reference signal configured to acquire phase compensation amount.

[0243] In another embodiment, the first communication device and the second communication device can acquire second indication information, which is used to indicate that the reference signal set is associated with the first sensing signal.

[0244] For example, the first communication device may determine the second indication information and send it to the second communication device. Alternatively, the second communication device may determine the second indication information and send it to the first communication device. Accordingly, the first communication device receives the second indication information from the second communication device. For instance, if the first communication device is a terminal and the second communication device is a network device, the network device may determine the second indication information and then send it to the terminal.

[0245] For example, the first and second communication devices could receive the second instruction information from other communication devices. For instance, both the first and second communication devices could be terminals, and both terminals could receive the second instruction information from a network device.

[0246] Optionally, the first configuration information includes the second indication information. However, this application is not limited to this; the first configuration information and the second indication information can be transmitted separately.

[0247] In this embodiment, the sensing signal and the reference signal used to acquire the phase compensation amount are configured with different configuration information. A second indication information can be used to indicate that the set of reference signals configured by the first configuration information is associated with the first sensing signal. This allows the communication device to determine the phase compensation amount acquired based on the set of reference signals, specifically for compensating the measurement result obtained based on the first sensing signal, according to the second indication information.

[0248] It is understood that, in order to achieve the functions in the above embodiments, the base station and terminal include hardware structures and / or software modules corresponding to perform each function. Those skilled in the art should readily recognize that, based on the units and method steps described in conjunction with the embodiments disclosed in this application, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0249] Figures 8 and 9 are schematic diagrams of possible communication devices provided in the embodiments of this application. These communication devices can be used to implement the functions of the terminal or network device in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of this application, the communication device can be one of the terminals 120a-120j shown in Figure 1, or it can be the network device 110a or 110b shown in Figure 1, or it can be a module (such as a chip or chip system) applied to the terminal or network device.

[0250] The communication device 800 includes a transceiver unit 820, which can be used to receive or send information. The communication device 800 may also include a processing unit 810, which can be used to process instructions or data to achieve corresponding operations.

[0251] It should be understood that when the communication device 800 is a chip configured in (or used in) a communication device, the transceiver unit 820 in the communication device 800 can be the input / output interface or circuit of the chip, and the processing unit 810 in the communication device 800 can be the processor in the chip.

[0252] Optionally, the communication device 800 may further include a storage unit 830, which can be used to store instructions or data, and the processing unit 810 can execute the instructions or data stored in the storage unit to enable the communication device to perform corresponding operations.

[0253] The communication device 800 can be used to implement the functions of the first communication device or the second communication device in the method embodiment shown in FIG3 above.

[0254] When the communication device 800 is used to implement the function of the first communication device in the method embodiment shown in FIG3: the transceiver unit 820 is used to receive a first reference signal. The transceiver unit 820 is also used to transmit a second reference signal and a third reference signal, the precoding of which is obtained based on the first reference signal, and the second and third reference signals are used to determine the precoding of a fourth reference signal; the transceiver unit 820 is also used to receive the fourth reference signal. The processing unit 810 is used to compensate for the first measurement result based on the fourth reference signal, wherein the compensated first measurement result is used to acquire sensing parameters.

[0255] When the communication device 800 is used to implement the function of the second communication device in the method embodiment shown in FIG3: the transceiver unit 820 is used to transmit a first reference signal, which is used to determine the precoding of a second reference signal, or the first reference signal is used to determine the precoding of a third reference signal. The transceiver unit 820 is used to receive the second reference signal and the third reference signal. The processing unit 810 is used to precode the fourth reference signal obtained based on the second reference signal and the third reference signal. The transceiver unit 820 is also used to transmit the fourth reference signal, which is used to compensate for the first measurement result, and the compensated first measurement result is used to acquire sensing parameters.

[0256] For a more detailed description of the processing unit 810 and the transceiver unit 820, please refer to the relevant description in the method embodiment shown in Figure 3.

[0257] It should be understood that the transceiver unit 820 in the communication device 800 can be implemented through a communication interface (such as a transceiver, transceiver circuit, input / output interface, or pins, etc.). When the communication interface is a transceiver, the transceiver can consist of a receiver and / or a transmitter. The processing unit 810 in the communication device 800 can be implemented through at least one processor, or it can be implemented through at least one logic circuit. Optionally, the communication device 800 also includes a storage unit, which can be implemented using a memory.

[0258] As shown in Figure 9, the communication device 900 includes a processor 910 and an interface circuit 920. The processor 910 and the interface circuit 920 are coupled to each other. It is understood that the interface circuit 920 can be a transceiver or an input / output interface. Optionally, the communication device 900 may also include a memory 930 for storing instructions executed by the processor 910, or storing input data required by the processor 910 to execute instructions, or storing data generated after the processor 910 executes instructions.

[0259] In one implementation, the memory 930 may be integrated into the processor 910 or independent of the processor 910.

[0260] When the communication device 900 is used to implement the method shown in FIG3, the processor 910 is used to implement the function of the processing unit 810, and the interface circuit 920 is used to implement the function of the transceiver unit 820.

[0261] When the aforementioned communication device is a chip applied to a terminal device, the terminal device chip can implement the functions of the second communication device in the above method embodiments. The terminal device chip receives information from other modules (such as an RF module or antenna) in the terminal device, the information being sent to the terminal device by the network device; or, the terminal device chip sends information to other modules (such as an RF module or antenna) in the terminal device, the information being sent to the network device by the terminal device.

[0262] When the aforementioned communication device is a module applied to a network device, the network device module can implement the functions of the first communication device in the above method embodiments. The network device module receives information from other modules (such as radio frequency modules or antennas) in the network device, which is information sent from the terminal device to the network device; or, the network device module sends information to other modules (such as radio frequency modules or antennas) in the network device, which is information sent from the network device to the terminal device. Here, the network device module can be the baseband chip of the network device, or it can be a DU or other modules. The DU here can be a DU under an open radio access network (O-RAN) architecture.

[0263] It is understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), microprocessor units (MPUs), microcontroller units (MCUs), graphics processing units (GPUs), artificial intelligence processors (AI processors), neural processing units (NPUs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

[0264] The method steps in the embodiments of this application can be implemented in hardware or in software instructions executable by a processor. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. The storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Alternatively, the ASIC can reside in an access network device or a terminal device. The processor and storage medium can also exist as discrete components in the access network device or terminal device.

[0265] According to the method provided in the application embodiments, this application embodiment also provides a computer program product, which includes: computer program code, which, when executed by one or more processors, causes a device including the processor to perform the method shown in FIG3.

[0266] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. This computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed, in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, or other programmable device.

[0267] According to the method provided in the embodiments of this application, the embodiments of this application also provide a computer-readable storage medium that stores the above-mentioned computer program or instructions. When the computer program or instructions are run by one or more processors, the apparatus including the processor performs the method shown in FIG3.

[0268] As described above, computer programs or instructions can be stored in or transferred from one computer-readable storage medium to another. For example, the computer programs or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video optical disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or it can include both volatile and non-volatile types of storage media.

[0269] According to the method provided in the embodiments of this application, the embodiments of this application also provide a communication system, including one or more of the aforementioned first communication devices. The system may further include one or more of the aforementioned second communication devices.

[0270] In the various embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus described above is merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0271] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this solution according to actual needs.

[0272] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0273] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A signal transmission method, characterized in that, include: Receive the first reference signal; A second reference signal and a third reference signal are transmitted, wherein the precode of the second reference signal or the precode of the third reference signal is obtained based on the first reference signal, and the second reference signal and the third reference signal are used to determine the precode of the fourth reference signal; The fourth reference signal is received, which is used to compensate for the first measurement result, wherein the compensated first measurement result is used to obtain sensing parameters.

2. The method according to claim 1, characterized in that, The method further includes: Based on the first reference signal, determine the first channel information; Based on the first channel information, determine the first precoding; The transmission of the second reference signal and the third reference signal includes: Using the first precoding, the second reference signal is transmitted; Send the third reference signal.

3. The method according to claim 2, characterized in that, The first channel information includes a first channel frequency response, and the phase of the first precoding is opposite to the phase of the first channel frequency response.

4. The method according to claim 1, characterized in that, The method further includes: Based on the first reference signal, determine the first channel information; Based on the first channel information, determine the first precoding; The transmission of the second reference signal and the third reference signal includes: Send a second reference signal; The third reference signal is transmitted using the first precoding.

5. The method according to claim 4, characterized in that, The first channel information includes a first channel frequency response, and the phase of the first precoding is the same as the phase of the first channel frequency response.

6. The method according to any one of claims 1 to 5, characterized in that, The first reference signal is received in the first time unit, and the second reference signal is sent in the second time unit. The first time unit and the second time unit are adjacent in time, or the first time unit and the second time unit are the same time unit. The third reference signal is sent in the third time unit, and the fourth reference signal is received in the fourth time unit. The third time unit and the fourth time unit are adjacent in time, or the third time unit and the fourth time unit are the same time unit.

7. The method according to any one of claims 1 to 5, characterized in that, The method further includes: No signal is received between the transmission of the second reference signal and the transmission of the third reference signal.

8. The method according to any one of claims 1 to 6, characterized in that, The second reference signal and the third reference signal are used to determine the precoding of the fourth reference signal, including: The second reference signal is used to determine the second channel information, the third reference signal is used to determine the third channel information, and the precoding of the fourth reference signal is the second precoding, which is determined based on the second channel information and the third channel information.

9. The method according to claim 8, characterized in that, The second channel information includes a second channel frequency response, the third channel information includes a third channel frequency response, and the phase of the second precoding is equal to the phase difference between the phase of the second channel frequency response and the phase of the third channel frequency response.

10. The method according to any one of claims 1 to 9, characterized in that, The method further includes: The fourth channel information is determined based on the fourth reference signal; The first measurement result is compensated based on the fourth channel information.

11. The method according to claim 10, characterized in that, The fourth channel information includes the fourth channel frequency response, the first measurement result includes the fifth channel frequency response, the compensated first measurement result includes the sixth channel frequency response, the phase of the sixth channel frequency response is equal to the phase difference between the phase of the fifth channel frequency response and the phase of the fourth channel frequency response, and the sixth channel frequency response is used to obtain the sensing parameters.

12. The method according to any one of claims 1 to 11, characterized in that, The first measurement result is obtained by measuring the first sensed signal, and the frequency domain density of the first sensed signal is a first frequency domain density, which is greater than a second frequency domain density. The second frequency domain density is the frequency domain density of one or more of the following reference signals: The first reference signal, the third reference signal, the second reference signal, or the fourth reference signal.

13. The method according to any one of claims 1 to 12, characterized in that, The method further includes: The system receives first configuration information, which is used to configure a first reference signal resource, a second reference signal resource, a third reference signal resource, and a fourth reference signal resource. The first configuration information includes first indication information, which is used to indicate the resource mapping style of the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource. The first reference signal resource is used to transmit the first reference signal, the second reference signal resource is used to transmit the second reference signal, the third reference signal resource is used to transmit the third reference signal, and the fourth reference signal resource is used to transmit the fourth reference signal.

14. The method according to claim 13, characterized in that, The first configuration information is used to configure a set of reference signal resources, which includes the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource. The reference signal resource set further includes a first sensing signal resource; or, the method further includes: receiving second indication information, the second indication information being used to indicate that the reference signal resource set is associated with the first sensing signal resource. Wherein, the first sensing signal resource is used to transmit the first sensing signal, and the first measurement result is obtained by measuring the first sensing signal.

15. The method according to claim 13 or 14, characterized in that, The method further includes: The system receives second configuration information, which is used to configure a first time-domain pattern. The first time-domain pattern is used to indicate at least one time unit among a transmission time unit, a reception time unit, or a mixed time unit. Wherein, the first reference signal is received in a first time unit, which is the last time unit in the first time domain pattern before the receiving time unit switches to the transmitting time unit, or the first time unit is a mixed time unit before the switching to the transmitting time unit; and / or, The second reference signal is transmitted in a second time unit, which is the first time unit after the reception time unit switches to the transmission time unit in the first time domain pattern, or the second time unit is a mixed time unit before the switch to the transmission time unit; and / or, The third reference signal is transmitted in a third time unit, which is the last time unit in the first time domain pattern before the transmission time unit switches to the reception time unit, or the third time unit is a mixed time unit before the switch to the reception time unit; and / or, The fourth reference signal is received in the fourth time unit, which is the first time unit after the transmission time unit in the first time domain pattern switches to the reception time unit, or the fourth time unit is a mixed time unit before the switch to the reception time unit.

16. The method according to claim 15, characterized in that, The method is applied to a first communication device, which is applied to a terminal. The receiving time unit is a downlink time unit, and the sending time unit is an uplink time unit.

17. The method according to claim 15 or 16, characterized in that, The first indication information is used to indicate the position of the sub-time unit used to carry the target reference signal within the target time unit. The target reference signal is the first reference signal, and the target time unit is the first time unit; and / or, The target reference signal is the second reference signal, and the target time unit is the second time unit; and / or, The target reference signal is the third reference signal, and the target time unit is the third time unit; and / or, The target reference signal is the fourth reference signal, and the target time unit is the fourth time unit.

18. A signal transmission method, characterized in that, include: Send a first reference signal, which is used to determine the precoding of a second reference signal, or the first reference signal is used to determine the precoding of a third reference signal; Receive the second reference signal and the third reference signal; A fourth reference signal is transmitted. The precoding of the fourth reference signal is obtained based on the second reference signal and the third reference signal. The fourth reference signal is used to compensate for the first measurement result. The compensated first measurement result is used to obtain sensing parameters.

19. The method according to claim 18, characterized in that, The first reference signal is used to determine the precoding of the second reference signal, including: The first reference signal is used to determine the first channel information, and the precoding of the second reference signal is the first precoding, which is determined based on the first channel information.

20. The method according to claim 19, characterized in that, The first channel information includes a first channel frequency response, and the phase of the first precoding is opposite to the phase of the first channel frequency response.

21. The method according to claim 18, characterized in that, The first reference signal is used to determine the precoding of the third reference signal, including: The first reference signal is used to determine the first channel information, and the precoding of the third reference signal is the first precoding, which is determined based on the first channel information.

22. The method according to claim 21, characterized in that, The first channel information includes a first channel frequency response, and the phase of the first precoding is the same as the phase of the first channel frequency response.

23. The method according to any one of claims 18 to 22, characterized in that, The first reference signal is sent in a first time unit, and the second reference signal is received in a second time unit. The first time unit and the second time unit are adjacent in time, or the first time unit and the second time unit are the same time unit. The third reference signal is received in the third time unit, and the fourth reference signal is sent in the fourth time unit. The third time unit and the fourth time unit are adjacent in time, or the third time unit and the fourth time unit are the same time unit.

24. The method according to claim 23, characterized in that, The method further includes: No signal is transmitted between receiving the second reference signal and receiving the third reference signal.

25. The method according to any one of claims 18 to 24, characterized in that, The transmission of the fourth reference signal includes: A second precoding is determined based on the second channel information and the third channel information, wherein the second channel information is determined based on the second reference signal and the third channel information is determined based on the third reference signal; The fourth reference signal is transmitted using the second precoding.

26. The method according to claim 25, characterized in that, The second channel information includes a second channel frequency response, the third channel information includes a third channel frequency response, and the phase of the second precoding is equal to the phase difference between the phase of the second channel frequency response and the phase of the third channel frequency response.

27. The method according to any one of claims 18 to 26, characterized in that, The fourth reference signal is used to determine the fourth channel information, which is used to compensate for the first measurement result.

28. The method according to claim 27, characterized in that, The fourth channel information includes the fourth channel frequency response, the first measurement result includes the fifth channel frequency response, the compensated first measurement result includes the sixth channel frequency response, the phase of the sixth channel frequency response is equal to the phase difference between the phase of the fifth channel frequency response and the phase of the fourth channel frequency response, and the sixth channel frequency response is used to obtain the sensing parameters.

29. The method according to any one of claims 18 to 28, characterized in that, The first sensing signal is used to acquire the first measurement result. The frequency domain density of the first sensing signal is a first frequency domain density, which is greater than the second frequency domain density. The second frequency domain density is the frequency domain density of one or more of the following reference signals: The first reference signal, the third reference signal, the second reference signal, or the fourth reference signal.

30. The method according to any one of claims 18 to 29, characterized in that, The method further includes: Send first configuration information, which is used to configure a first reference signal resource, a second reference signal resource, a third reference signal resource, and a fourth reference signal resource; wherein, the first configuration information includes first indication information, which is used to indicate the resource mapping style of the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource, the first reference signal resource is used to send the first reference signal, the second reference signal resource is used to send the second reference signal, the third reference signal resource is used to send the third reference signal, and the fourth reference signal resource is used to send the fourth reference signal.

31. The method according to claim 30, characterized in that, The first configuration information is used to configure a set of reference signal resources, which includes the first reference signal resource, the third reference signal resource, the second reference signal resource, and the fourth reference signal resource. The reference signal resource set further includes a first sensing signal resource; or, the method further includes: sending second indication information, the second indication information being used to indicate that the reference signal resource set is associated with the first sensing signal resource. Wherein, the first sensing signal resource is used to transmit the first sensing signal, and the first measurement result is obtained by measuring the first sensing signal.

32. The method according to claim 31, characterized in that, The method further includes: Send second configuration information, which is used to configure a first time-domain pattern. The first time-domain pattern is used to indicate at least one time unit among a transmission time unit, a reception time unit, or a mixed time unit. Wherein, the first reference signal is transmitted in a first time unit, which is the last time unit in the first time domain pattern before the transmission time unit switches to the reception time unit, or the first time unit is a mixed time unit before the switch to the reception time unit; and / or, The second reference signal is received in a second time unit, which is the first time unit after the transmission time unit in the first time domain pattern switches to the reception time unit, or the second time unit is a mixed time unit before the switch to the reception time unit; and / or, The third reference signal is received in a third time unit, which is the last time unit in the first time domain pattern before the receiving time unit switches to the transmitting time unit, or the third time unit is a mixed time unit before the switching to the transmitting time unit; and / or, The fourth reference signal is transmitted in the fourth time unit, which is the first time unit after the receiving time unit in the first time domain pattern switches to the transmitting time unit, or the fourth time unit is a mixed time unit before switching to the transmitting time unit.

33. The method according to claim 32, characterized in that, The method is applied to a second communication device, which is applied to a network device. The receiving time unit is an uplink time unit, and the sending time unit is a downlink time unit.

34. The method according to claim 32 or 33, characterized in that... The first indication information is used to indicate the position of the sub-time unit used to carry the target reference signal within the target time unit. The target reference signal is the first reference signal, and the target time unit is the first time unit; and / or, The target reference signal is the second reference signal, and the target time unit is the second time unit; and / or, The target reference signal is the third reference signal, and the target time unit is the third time unit; and / or, The target reference signal is the fourth reference signal, and the target time unit is the fourth time unit.

35. A communication device, characterized in that, The device includes at least one processor coupled to a memory for storing a computer program, the processor executing the computer program stored in the memory to cause the communication device to perform the method as claimed in any one of claims 1 to 17; or to cause the communication device to perform the method as claimed in any one of claims 18 to 34.

36. The communication device according to claim 35, characterized in that, The communication device is a chip.

37. A computer-readable storage medium, characterized in that, The computer stores instructions that, when executed on the computer, cause the computer to perform the method as claimed in any one of claims 1 to 17, or the method as claimed in any one of claims 18 to 34.

38. A computer program product, characterized in that, The computer program product includes: a computer program that, when run, causes a computer to perform the method of any one of claims 1 to 17, or the method of any one of claims 18 to 34.

39. A communication system, characterized in that, It includes a first communication device and a second communication device, wherein the first communication device is used to perform the method as described in any one of claims 1 to 17, and the second communication device is used to perform the method as described in any one of claims 18 to 34.

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