Reference signal sending method, reference signal processing method, and related apparatus

Abstract

Disclosed in the embodiments of the present application are a reference signal sending method, a reference signal processing method, and a related apparatus, which are applied to the field of communications and are used for realizing sensing detection. The reference signal sending method in the embodiments of the present application comprises: sending a first reference signal, wherein the first reference signal is mapped onto a first frequency band by means of a first comb tooth having a size of M, M being a positive integer; and periodically sending a second reference signal, wherein the second reference signal is mapped onto a second frequency band by means of at least one second comb tooth, the size of each second comb tooth is a positive integer greater than M, and the first reference signal and the second reference signal are used for determining a measurement result of a sensing target. By means of the embodiments of the present application, the overheads of a required reference signal can be reduced while sensing detection is realized.

Description

Reference signal sending method, reference signal processing method and related devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 25, 2023, with application number 202311088783.9 and invention name “A reference signal sending method, reference signal processing method and related device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of communications, and in particular to a reference signal sending method, a reference signal processing method, and related devices. Background Art

[0003] In perception scenarios, it is usually necessary to meet the requirements of ranging and speed measurement at the same time. The performance of ranging and speed measurement is determined by the frequency domain characteristics and time domain characteristics of the reference signal (RS), respectively.

[0004] For ranging, the bandwidth B of the reference signal determines the ranging resolution ΔR, that is, Where C is the speed of light. The larger the bandwidth, the finer the resolution of the ranging, and the easier it is to distinguish each target in the perception scene. The frequency domain interval Δf within the reference signal determines the maximum unambiguous ranging range R of the ranging. max ,Right now The smaller the frequency domain interval, that is, the denser the subcarriers occupied by the interval, the longer the unambiguous ranging range. For speed measurement, the time domain interval T of sending reference signals is P Determine the maximum unambiguous speed measurement range V max ,Right now in is the carrier wavelength, f c is the carrier frequency, the time domain interval T for sending reference signals P The smaller it is, the larger the unambiguous speed measurement range is.

[0005] In the current perception measurement process, in order to obtain more accurate ranging results and more accurate speed measurement results, it is necessary to frequently send reference signals for measurement, resulting in excessive resource overhead for sending reference signals.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a reference signal sending method, a reference signal processing method and related devices, which are used to realize the detection of perception targets in perception scenarios and save reference signal overhead.

[0008] A first aspect of the embodiments of the present application provides a reference signal sending method:

[0009] First, a first reference signal is sent. The first reference signal is mapped onto a first frequency band using a first comb tooth with a size of M, where M is a positive integer.

[0010] Then, second reference signals are periodically sent, where each second reference signal is mapped to the second frequency band with at least one second comb tooth, and the size of each second comb tooth is a positive integer greater than M.

[0011] The two types of reference signals sent, the first reference signal and the second reference signal, are used to determine the measurement results of the perceived target, and the measurement results include the distance of the perceived target and the moving speed of the perceived target.

[0012] By adopting the above method, that is, using a second comb tooth larger than the size of the first comb tooth to send the second reference signal, the frequency domain interval within the second reference signal can be made larger than the frequency domain interval within the first reference signal, so the number of subcarriers occupied by each second reference signal is less than the number of subcarriers occupied by the first reference signal. Compared with directly sending the first reference signal periodically, the overall overhead of the reference signal required to achieve perception can be reduced.

[0013] In some optional implementations, the bandwidth of the second frequency band is the same as the bandwidth of the first frequency band.

[0014] In particular, the second frequency band and the first frequency band can be the same frequency band, and the first reference signal and the second reference signal are mapped on the same frequency band, wherein the comb teeth sizes of the first reference signal and the second reference signal mapped on the frequency band are different and the transmission times are different.

[0015] In this possible implementation, the ranging result of the first reference signal and the ranging result of the second reference signal can have the same ranging resolution, which is conducive to achieving matching of the ranging results of the two for the perceived target.

[0016] In some optional implementations, the second reference signal is mapped onto the second frequency band using a plurality of second comb teeth, wherein the greatest common divisor of sizes of every two second comb teeth is not greater than the size M of the first comb tooth.

[0017] In this possible implementation, by sending a second reference signal with multiple different comb tooth sizes, the ranging results corresponding to each two perceived targets at different comb tooth sizes will not be aliased at the same time, thereby enabling the unambiguous ranging results and the unambiguous speed measurement results in a multi-target scenario to be matched one-to-one.

[0018] In some optional embodiments, the size of each second comb tooth in the plurality of second comb teeth is an integer multiple of the size M of the first comb tooth, and when M is 1, the size of each second comb tooth is mutually prime.

[0019] This possible implementation manner is beneficial for matching the ranging result of the first reference signal and the ranging result of the second reference signal of the perceived target in a multi-target scenario.

[0020] In some optional implementations, the mapping of each comb tooth in the plurality of second comb teeth on the frequency band is the same starting subcarrier, that is, the mapping starts on the same subcarrier sequence number.

[0021] In this possible implementation manner, different second comb teeth are mapped onto the same subcarrier, which can increase the multiplexing rate of the subcarrier and further reduce the reference signal overhead.

[0022] In some optional implementations, when the second reference signal is mapped to the second frequency band using a second comb tooth, the size of the second comb tooth is N. The method further includes: periodically sending a third reference signal, each third reference signal being sent in the form of being mapped to the third frequency band using a third comb tooth of size X. X is a positive integer greater than M and not equal to N, and the greatest common divisor of X and N is not greater than M.

[0023] In this possible implementation, a third comb tooth larger than the first comb tooth is used to send a third reference signal, wherein the size of the third comb tooth is different from the size of the second comb tooth, and the greatest common divisor of the two is not greater than the size M of the first comb tooth. This ensures that every two perceived targets will not be simultaneously aliased in the ranging result of the second reference signal and the ranging result of the third reference signal, thereby enabling unambiguous ranging results and unambiguous speed measurement results in a multi-target scenario to be matched one-to-one.

[0024] In some optional implementations, the bandwidth of the third frequency band is the same as the bandwidth of the first frequency band.

[0025] In particular, the first frequency band, the second frequency band and the third frequency band may also be the same frequency band, and the first reference signal, the second reference signal and the third reference signal are all mapped on the same frequency band, wherein the comb tooth sizes of the first reference signal, the second reference signal and the third reference signal mapped on the frequency band are different and the transmission times are different.

[0026] In this possible implementation, the ranging result of the first reference signal and the ranging result of the third reference signal can have the same ranging resolution, which is conducive to achieving matching of the ranging results of the two for the perceived target.

[0027] In some optional embodiments, each third reference signal corresponds to a second reference signal, wherein the time interval between the transmission time of each third reference signal and the transmission time of its corresponding second reference signal is less than or equal to a first threshold, where the first threshold is the duration during which their ranging results do not change significantly. When the time interval is equal to 0, it can be understood that two reference signals with a comb tooth size of N and a comb tooth size of X are simultaneously transmitted on the same frequency band.

[0028] In this possible implementation, the time interval between each third reference signal and the corresponding second reference signal does not exceed a duration that causes a significant change in the ranging results of the two, which is beneficial for distinguishing multipath aliasing in a multi-target scenario.

[0029] In some optional embodiments, the size N of the second comb teeth and the size X of the third comb teeth are both integer multiples of the size M of the first comb teeth. When M is 1, N and X are relatively prime.

[0030] This possible implementation manner is conducive to matching the ranging result of the first reference signal with the ranging result of the second reference signal and the ranging result of the third reference signal in a multi-target scenario.

[0031] In some optional embodiments, the time interval between the time instant of sending the first reference signal and the time instant of sending the first second reference signal is less than or equal to a second threshold, that is, the first second reference signal is sent within the duration of the second threshold after sending the first reference signal, and the second threshold is the duration during which the target distance does not change significantly.

[0032] In this possible implementation manner, the time interval between the sending time of the first reference signal and the sending time of the first second reference signal does not exceed the duration of a significant change in the target distance, which is conducive to matching the ranging result of the first reference signal and the ranging result of the second reference signal.

[0033] In some optional embodiments, before periodically transmitting the second reference signal, the method further includes: receiving a first reflection signal, where the first reflection signal is an echo signal reflected from the transmitted first reference signal by the sensing target; determining a first distance to the sensing target based on the first reflection signal; wherein the sensing target may be one target or multiple targets, meaning that the first distance may be one or multiple; and determining a size of the second comb teeth based on the first distance.

[0034] In particular, the size of the second comb teeth and the size of the third comb teeth can also be determined simultaneously according to the first distance.

[0035] In this possible implementation, a first distance to the perceived target is calculated using the first reflected signal, and then a second comb tooth is determined based on the first distance so that multipath aliasing does not occur in the ranging result of the second reference signal, which helps reduce the reference signal overhead.

[0036] In some optional implementations, before periodically sending the second reference signal, the method further includes: receiving indication information, where the indication information is used to determine the size of the second comb teeth.

[0037] In particular, the indication information may also be used to determine the size of the second comb teeth and the size of the third comb teeth.

[0038] In this possible implementation, determining the size of the second comb teeth or determining the size of the second comb teeth and the size of the third comb teeth based on the indication information can ensure that multipath aliasing does not occur in the ranging result of the second reference signal, or that the ranging results of the second reference signals with multiple comb tooth sizes can distinguish between perceived targets that experience multipath aliasing, or that the ranging results of the second reference signal and the third reference signal can distinguish between perceived targets that experience multipath aliasing, thereby achieving matching of unambiguous ranging results and unambiguous speed measurement results of the perceived targets.

[0039] In some optional embodiments, there are multiple sensing targets, and the second distance is calculated based on the received second reflected signal. The indication information includes: the second distances corresponding to different sensing targets; or the distance difference between each two sensing targets; or the recommended size of the second comb teeth; or the recommended size of the second comb teeth and the recommended size of the third comb teeth. The second distances corresponding to different sensing targets or the distance difference between each two sensing targets can be used to determine the size of the second comb teeth, or the size of the second comb teeth and the size of the third comb teeth.

[0040] In this possible implementation, a second distance to the perceived target is calculated using the second reflected signal, and then indication information is sent based on the second distance, so that a second comb tooth of multipath aliasing does not occur in the ranging result of the second reference signal, which is beneficial for reducing the reference signal overhead; the indication information can have multiple different forms.

[0041] In some optional embodiments, the measurement result for the perceived target includes: a third distance, a fourth distance, and a first speed corresponding to the fourth distance. The third distance is an unambiguous distance measurement result obtained based on the first reference signal. The fourth distance is an ambiguous distance measurement result obtained based on the second reference signal. The first speed is an unambiguous speed measurement result obtained based on the second reference signal. The perceived target includes one or more. The first comb teeth and the second comb teeth are used to match the third distance in the measurement result with the fourth distance, and with the first speed corresponding to the fourth distance, ultimately obtaining the third distance and the corresponding first speed of the perceived target.

[0042] In this possible implementation, the unambiguous distance measurement result and the unambiguous speed measurement result of the perceived target are matched one-to-one by the proportional relationship between the first comb teeth and the second comb teeth.

[0043] In some optional embodiments, the measurement result for the perceived target further includes: a fifth distance, and a first speed corresponding to the fifth distance. The fifth distance is a fuzzy distance measurement result obtained based on the third reference signal. The first speed is an unambiguous speed measurement result obtained based on the third reference signal. The perceived target includes one or more. The first comb teeth, the second comb teeth, and the third comb teeth are used to match the third distance in the measurement result with the fourth distance, and with the first speed corresponding to the fourth distance; and / or, to match the third distance with the fifth distance, and with the first speed corresponding to the fifth distance; ultimately obtaining the third distance of the perceived target and the corresponding first speed.

[0044] In this possible implementation, the unambiguous distance measurement result and the unambiguous speed measurement result of the perceived target are matched one-to-one by the proportional relationship between the first comb teeth, the second comb teeth, and the third comb teeth.

[0045] In some optional implementations, the first reference signal is also sent periodically, and the sending period of the first reference signal is greater than the sending period of the second reference signal, so multiple second reference signals are sent within each sending period of the first signal.

[0046] In this possible implementation manner, by periodically sending the first reference signal and the second reference signal, an unambiguous distance measurement result and an unambiguous speed measurement result of the perceived target can be continuously obtained.

[0047] A second aspect of the present application provides a reference signal processing method:

[0048] A second reflected signal is received, where the second reflected signal is a reflected signal of the transmitted first reference signal reflected on a sensing target, and the first reference signal is mapped onto a first frequency band using a first comb tooth having a size of M, where M is a positive integer.

[0049] Then, receiving a third reflected signal, where the third reflected signal is a reflected signal of the periodically transmitted second reference signal reflected on the sensing target, wherein each second reference signal is mapped to the second frequency band with at least one second comb tooth, and a size of each second comb tooth is greater than M;

[0050] The two types of reference signals sent, the first reference signal and the second reference signal, are used to determine the measurement results of the perceived target, and the measurement results include the distance of the perceived target and the moving speed of the perceived target.

[0051] By adopting the above method, that is, using a second comb tooth larger than the size of the first comb tooth to send the second reference signal, the frequency domain interval of the second reference signal can be made larger than the frequency domain interval of the first reference signal, so the number of subcarriers occupied by the second reference signal is less than the number of subcarriers occupied by the first reference signal. Compared with directly sending the first reference signal periodically, the overall overhead of the reference signal required to achieve perception can be reduced.

[0052] In some optional embodiments, when the second reference signal is mapped to the second frequency band using a second comb tooth, the size of the second comb tooth is N. The method further includes: receiving a fourth reflected signal, where the fourth reflected signal is a reflected signal of the periodically sent third reference signal reflected on the sensing target, wherein each third reference signal is mapped to the third frequency band using a third comb tooth of size X, where X is a positive integer greater than M and not equal to N, and the greatest common divisor of X and N is not greater than M.

[0053] By using the above method, a third comb tooth larger than the first comb tooth is used to send a third reference signal, wherein the size of the third comb tooth is different from the size of the second comb tooth, and the greatest common divisor of the two is not greater than the size M of the first comb tooth. This ensures that every two perceived targets will not be simultaneously aliased in the ranging result of the second reference signal and the ranging result of the third reference signal, thereby enabling unambiguous ranging results and unambiguous speed measurement results in a multi-target scenario to be matched one-to-one.

[0054] In some optional embodiments, when there are multiple sensing targets, the method further includes: determining second distances to different sensing targets based on the second reflected signal, and sending indication information based on the second distances to different sensing targets, where the indication information can be used to determine the size of the second comb teeth.

[0055] In particular, the indication information may also be used to determine the size of the second comb teeth and the size of the third comb teeth.

[0056] In this possible implementation, the second distances of different sensing targets are calculated by receiving the second reflected signal, and the size of the second comb teeth in which multipath aliasing does not occur in the ranging result of the second reference signal can be determined in advance, and indication information is sent, which is conducive to reducing the overhead of the reference signal.

[0057] In some optional embodiments, the indication signal includes: a second distance between different sensing targets; or a distance difference between each two sensing targets; or a recommended size of the second comb teeth; or a recommended size of the second comb teeth and a recommended size of the third comb teeth. The size of the second comb teeth can be determined based on the second distance between different sensing targets or the distance difference between each two sensing targets.

[0058] In this possible implementation, the indication information may be in various forms.

[0059] In some optional embodiments, the measurement results for the perceived target include: a third distance, a fourth distance, and a first speed corresponding to the fourth distance. The third distance is an unambiguous distance measurement result obtained based on the first reference signal. The fourth distance is a fuzzy distance measurement result obtained based on the second reference signal. The first speed is an unambiguous speed measurement result obtained based on the second reference signal: the moving speed of the perceived target. The perceived target includes one or more. The first comb teeth and the second comb teeth are used to match the third distance in the measurement result with the fourth distance, and match the first speed corresponding to the fourth distance, and finally obtain the third distance of the perceived target and the corresponding first speed.

[0060] In this possible implementation, the unambiguous distance measurement result and the unambiguous speed measurement result of the perceived target are matched one-to-one by the proportional relationship between the first comb teeth and the second comb teeth.

[0061] In some optional embodiments, the measurement result for the perceived target also includes: a fifth distance, and a first speed corresponding to the fifth distance. The fifth distance is a fuzzy distance measurement result obtained based on the third reference signal. The first speed is an unambiguous speed measurement result obtained based on the third reference signal: the moving speed of the perceived target. The perceived target includes one or more. The first comb teeth, the second comb teeth, and the third comb teeth are used to match the third distance in the measurement result with the fourth distance, and with the first speed corresponding to the fourth distance; and / or, the third distance is matched with the fifth distance, and with the first speed corresponding to the fifth distance; and finally the third distance and the corresponding first speed of the perceived target are obtained.

[0062] In this possible implementation, the unambiguous distance measurement result and the unambiguous speed measurement result of the perceived target are matched one-to-one by the proportional relationship between the first comb teeth, the second comb teeth, and the third comb teeth.

[0063] A third aspect of the present application provides a communication device, the communication device comprising a first transceiver module and a second transceiver module, wherein:

[0064] A first transceiver module is configured to send a first reference signal, where the first reference signal is mapped onto a first frequency band using a first comb tooth of size M, where M is a positive integer;

[0065] a second transceiver module, periodically sending a second reference signal, wherein the second reference signal is mapped onto the second frequency band using at least one second comb tooth, and a size of each second comb tooth is a positive integer greater than M;

[0066] The first reference signal and the second reference signal are used to determine a measurement result of a perception target.

[0067] In some optional implementations, the bandwidth of the second frequency band is the same as the bandwidth of the first frequency band.

[0068] In some optional implementations, each second reference signal is mapped onto the second frequency band using a plurality of second comb teeth, and the greatest common divisor of sizes of every two second comb teeth is not greater than M.

[0069] In some optional embodiments, the size of each second comb tooth is an integer multiple of M.

[0070] In some optional implementations, when the second reference signal is mapped on the second frequency band using multiple second comb teeth, mapping start subcarriers corresponding to different second comb teeth are the same.

[0071] In some optional embodiments, when there is one second comb tooth, the size of the second comb tooth is N, where N is a positive integer, and the method further includes:

[0072] A third reference signal is periodically sent and mapped onto a third frequency band using a third comb tooth of size X, where X is a positive integer greater than M and not equal to N, and the greatest common divisor of X and N is not greater than M.

[0073] In some optional implementations, the bandwidth of the third frequency band is the same as the bandwidth of the second frequency band.

[0074] In some optional implementations, each third reference signal corresponds to a second reference signal, and a time interval between a sending time of each third reference signal and a sending time of the second reference signal corresponding to the third reference signal is less than or equal to a first threshold.

[0075] In some optional implementations, both X and N are integer multiples of M.

[0076] In some optional implementations, the time interval between the sending time of the first reference signal and the sending time of the first second reference signal is less than or equal to the second threshold.

[0077] In some optional implementations, before periodically sending the second reference signal, the method further includes:

[0078] receiving a first reflection signal, where the first reflection signal is an echo signal reflected from a sensing target by the transmitted first reference signal, and the first reflection signal is used to determine a first distance;

[0079] According to the first distance, the size of the second comb teeth is determined, or the size of the second comb teeth and the size of the third comb teeth are determined.

[0080] In some optional embodiments, a second reflected signal is received, where the second reflected signal is a reflected signal of the transmitted first reference signal reflected on a sensing target. There are multiple sensing targets, and the second reflected signal is used to determine second distances of different sensing targets. The indication information includes:

[0081] a second distance to a different perceived target; or,

[0082] The difference between each two second distances; or

[0083] a recommended size of the second comb teeth, or a recommended size of the second comb teeth and a recommended size of the third comb teeth;

[0084] The second distances corresponding to different perception targets or the difference between every two second distances are used to determine the size of the second comb teeth, or to determine the size of the second comb teeth and the size of the third comb teeth.

[0085] In some optional embodiments, the measurement result for the perceived target includes: a third distance, a fourth distance, and a first speed corresponding to the fourth distance; wherein the third distance is obtained based on the first reference signal, the fourth distance is obtained based on the second reference signal, and the first speed is obtained based on the second reference signal: a moving speed of the perceived target; wherein the perceived target includes one or more;

[0086] The first comb teeth and the second comb teeth are used to match the third distance in the measurement result with the fourth distance, and to match the first speed corresponding to the fourth distance.

[0087] In some optional implementations, the first reference signal is sent periodically, and the sending period of the first reference signal is greater than the sending period of the second reference signal.

[0088] A fourth aspect of the present application provides a communication device, the communication device comprising a first processing module and a second processing module, wherein:

[0089] a first processing module, configured to receive a second reflected signal, where the second reflected signal is a reflected signal of the transmitted first reference signal reflected on a sensing target, and the first reference signal is mapped onto a first frequency band using a first comb tooth of size M, where M is a positive integer;

[0090] a second processing module, configured to receive a third reflected signal, where the third reflected signal is a reflected signal of the periodically transmitted second reference signal reflected on the sensing target, wherein each second reference signal is mapped to the second frequency band with at least one second comb tooth, and a size of each second comb tooth is greater than M;

[0091] The first reference signal and the second reference signal are used to determine a measurement result of the perception target.

[0092] In some optional embodiments, when there is one second comb tooth, the size of the second comb tooth is N, and the method further includes:

[0093] A fourth reflected signal is received, where the fourth reflected signal is a reflected signal of the periodically sent third reference signal reflected on the perception target, wherein each third reference signal is mapped to the third frequency band with a third comb tooth of size X, where X is an integer greater than M and not equal to N, and the greatest common divisor of X and N is not greater than M.

[0094] In some optional implementations, there are multiple sensing targets, and the method further includes:

[0095] determining a second distance of the different sensing targets according to the second reflected signal;

[0096] According to the second distance, indication information is sent, where the indication information is used to determine the size of the second comb teeth, or to determine the size of the second comb teeth and the size of the third comb teeth.

[0097] In some optional implementations, the indication information includes:

[0098] a second distance to a different perceived target; or,

[0099] The difference between each two second distances; or

[0100] a recommended size of the second comb teeth, or a recommended size of the second comb teeth and a recommended size of the third comb teeth;

[0101] The second distances of different perception targets or the difference between every two second distances are used to determine the size of the second comb teeth, or to determine the size of the second comb teeth and the size of the third comb teeth.

[0102] In some optional embodiments, the measurement result for the perceived target includes: a third distance, a fourth distance, and a first speed corresponding to the fourth distance; wherein the third distance is obtained based on the first reference signal, the fourth distance is obtained based on the second reference signal, and the first speed is obtained based on the second reference signal: a moving speed of the perceived target; wherein the perceived target includes one or more;

[0103] The first comb teeth and the second comb teeth are used to match the third distance in the measurement result with the fourth distance, and to match the first speed corresponding to the fourth distance.

[0104] In a fifth aspect, the present application provides a communication device, comprising a processor, wherein the processor is configured to call and execute a computer program stored in a memory, so that the processor implements the first aspect or any one of the implementations of the first aspect.

[0105] Optionally, the communication device further includes a transceiver; the processor is further configured to control the transceiver to transmit and receive signals.

[0106] Optionally, the communication device includes a memory in which a computer program is stored.

[0107] The communication device described in the fifth aspect above may be a device or a chip (system) in the device.

[0108] In a sixth aspect, the present application provides a communication device, comprising a processor configured to call and execute a computer program stored in a memory, so that the processor implements the second aspect or any one of the implementations of the second aspect.

[0109] Optionally, the communication device further includes a transceiver; the processor is further configured to control the transceiver to transmit and receive signals.

[0110] Optionally, the communication device includes a memory in which a computer program is stored.

[0111] The communication device described in the sixth aspect above may be a device or a chip (system) in the device.

[0112] The seventh aspect of the present application provides a communication device, which may be a module or unit (for example, a chip, or a chip system, or a circuit) that corresponds one-to-one to the method / operation / step / action described in the first aspect / third aspect, or a device that can be used in conjunction with the communication device.

[0113] In an eighth aspect, the present application provides a communication device, which may be a module or unit (for example, a chip, or a chip system, or a circuit) that corresponds one-to-one to the method / operation / step / action described in the second aspect / fourth aspect, or a device that can be used in conjunction with the communication device.

[0114] The ninth aspect of the present application provides a communication system, which includes the communication device of the fifth aspect and the communication device of the sixth aspect, the communication device of the fifth aspect is used to execute the above-mentioned first aspect or any one of the implementation methods of the first aspect, and the communication device of the sixth aspect is used to execute the above-mentioned second aspect or any one of the implementation methods of the second aspect.

[0115] The tenth aspect of the present application provides a computer program product comprising instructions, characterized in that when it is run on a computer, it enables the computer to execute the first aspect or any one of the implementation methods of the first aspect, or enables the computer to execute the second aspect or any one of the implementation methods of the second aspect.

[0116] In the eleventh aspect of the present application, a computer-readable storage medium is provided, comprising computer instructions. When the computer instructions are executed on a computer, the computer is caused to execute the first aspect or any one of the implementation methods of the first aspect, or the second aspect or any one of the implementation methods of the second aspect.

[0117] The twelfth aspect of the present application provides a chip device, including a processor, which is used to be connected to a memory and call a program stored in the memory so that the processor executes the above-mentioned first aspect or any one of the implementation methods of the first aspect, or so that the processor executes the above-mentioned second aspect or any one of the implementation methods of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0118] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0119] FIG1A is a schematic diagram of a perception scene in an embodiment of the present application;

[0120] FIG1B is a schematic diagram of a self-transmitting and self-receiving scenario according to an embodiment of the present application;

[0121] FIG1C is a schematic diagram of a scenario in which a person sends and receives data independently according to an embodiment of the present application;

[0122] FIG2 is a schematic diagram of an embodiment of a method for sending a reference signal according to an embodiment of the present application;

[0123] FIG3 is a schematic diagram of a reference signal transmission method according to an embodiment of the present application;

[0124] FIG4 is a schematic diagram of a measurement result of a reference signal sending method according to an embodiment of the present application;

[0125] FIG5 is a schematic diagram of another measurement result of the reference signal sending method according to an embodiment of the present application;

[0126] FIG6 is a schematic diagram of another embodiment of a method for sending a reference signal according to an embodiment of the present application;

[0127] FIG7 is another reference signal transmission schematic diagram of the reference signal transmission method according to an embodiment of the present application;

[0128] FIG8 is a schematic diagram of another measurement result of the reference signal sending method according to an embodiment of the present application;

[0129] FIG9 is another reference signal transmission schematic diagram of the reference signal transmission method according to an embodiment of the present application;

[0130] FIG10 is a schematic diagram of another embodiment of a method for sending a reference signal according to an embodiment of the present application;

[0131] FIG11A is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0132] FIG11B is another schematic structural diagram of a communication device provided in an embodiment of the present application;

[0133] FIG11C is another schematic structural diagram of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0134] Embodiments of the present application provide a reference signal transmission method for detecting a target in a sensing scenario. This application also provides a corresponding reference signal processing method, a communication device, a communication system, a computer-readable storage medium, and a computer program product. These are described in detail below.

[0135] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0136] The terms "first," "second," "third," "fourth," etc. (if any) in the specification and claims of the present application and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or apparatus.

[0137] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: satellite communication, fifth generation (5G) system or new radio (NR), sidelink (SL) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), mobile communication systems after 5G networks (for example, 6G mobile communication systems), vehicle to everything (V2X) communication systems, etc.

[0138] In addition to enhanced communication capabilities, these communication systems also possess perception capabilities, achieving integrated communication and perception. This refers to systems that can communicate using communication signals (also described as communication channels) and perform perception measurements using perception signals (also described as perception channels). "Perception" can be understood as gaining awareness of target objects or environmental information (such as their attributes and state) by analyzing direct, reflected, and scattered radio wave signals. This allows for functions such as positioning, ranging, speed measurement, imaging, detection, identification, and environmental reconstruction, enabling perceptual exploration of the physical world.

[0139] The technical solutions of the embodiments of the present application can be applied to perception scenarios, or can be applied to positioning scenarios. Of course, they can also be applied to scenarios related to perception or positioning, or scenarios derived from perception or positioning.

[0140] For example, the method provided in the embodiments of the present application can be applied to vehicle networking scenarios, such as for detecting vehicle violations and assisting autonomous driving. In vehicle violation detection, continuous sensing and detection of the vehicle can be performed to detect whether the vehicle has violated traffic rules (such as speeding, illegal parking, occupying bus lanes, etc.). In assisted autonomous driving, the perception of the surrounding traffic environment can be used to assist vehicle autonomous driving, such as sensing the distance between the vehicle and the lane line to determine whether the vehicle has deviated from the route.

[0141] Exemplarily, the method provided in the embodiments of the present application can also be applied to drone scenarios, for example, by performing perception detection on a specific large-scale airspace to identify illegal drone intrusions, or by providing the perception results to the drone, it can assist the drone in flight and improve the drone's obstacle avoidance success rate.

[0142] For example, the method provided in the embodiment of the present application can also be applied to smart home scenarios, and by sensing people's behavior, it can further achieve control of home appliances, security monitoring, health detection, etc.

[0143] The scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0144] The perception scenarios provided in this application can be understood by referring to Figures 1A to 1C.

[0145] As shown in Figure 1A, the perception scene includes a communication device and five targets to be sensed: Target A, Target B, Target C, Target D, and Target E, located at different locations within the perception scene. Based on service requirements, the communication device needs to obtain the location and speed of the targets in the scene. The communication device transmits a reference signal and receives the signal reflected from the target via a receiver. The receiver analyzes and processes the reflected signal to obtain the distance and speed measurement results for each target in the scene.

[0146] The communication device can transmit a reference signal via an antenna port. In the following discussion, the embodiments of the present application consider a single antenna port for achieving ranging and velocity measurement of a perceived target. However, the present invention is not limited thereto and can be expanded to multiple antenna ports for sensing / positioning by those skilled in the art.

[0147] This scenario can be achieved by self-transmission and self-collection, or by self-transmission and other-collection.

[0148] As shown in FIG. 1B , this is a self-transmitting and self-receiving scenario: that is, both sending the reference signal and receiving the reflected signal are performed by the first device.

[0149] As shown in Figure 1C, this is a self-transmitting and other-receiving scenario: that is, the first device sends the reference signal, and the second device receives the reflected signal. The first device and the second device are not the same device. After receiving the reflected signal, the second device needs to report the measurement results based on the reflected signal to the sending device that sent the reference signal.

[0150] The "first device" can be the above-mentioned access network device / terminal device, or can be a chip in the access network device / terminal device, and the "second device" can be the above-mentioned access network device / terminal device, or can be a chip in the access network device / terminal device.

[0151] The following is an introduction to the terminal equipment and access network equipment of this application.

[0152] A terminal device may be a wireless terminal device capable of receiving scheduling and instruction information from devices in the core network or access network. A wireless terminal device may be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem or a device with sensing capabilities.

[0153] Terminal devices, also known as user equipment (UE), mobile stations (MS), or mobile terminals (MT), are devices that include wireless communication capabilities and / or sensing capabilities (providing voice / data connectivity to users), such as handheld devices or in-vehicle devices with wireless connectivity. Currently, some examples of terminal devices include: mobile phones, tablets, laptops, PDAs, drones, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in the Internet of Vehicles, wireless terminals in self-driving cars, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. For example, wireless terminals in the Internet of Vehicles (IoV) can be in-vehicle devices, complete vehicle equipment, in-vehicle modules, and vehicles. Wireless terminals in industrial control can be cameras and robots. Wireless terminals in smart homes can be televisions, air conditioners, sweepers, speakers, and set-top boxes.

[0154] Access network equipment is deployed in a radio access network to provide wireless communication and / or sensing functions for terminal devices. For example, an access network equipment can be a radio access network (RAN) node that connects the terminal device to a wireless network.

[0155] Access network equipment includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), access point (AP) in wireless fidelity (WIFI) system, wireless relay node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP), etc., and can also be access network equipment in 5G mobile communication system. For example, a next-generation NodeB (gNB), a transmission reception point (TRP), or a transmission point (TP) in a new radio (NR) system; or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G mobile communication system; or access network equipment can also be a network node that constitutes a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU).

[0156] In some deployments, a gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some gNB functions, while the DU implements some gNB functions. For example, the CU is responsible for processing non-real-time protocols and services, implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, implementing the functions of the radio link control (RLC), media access control (MAC), and physical (PHY) layers. The AAU implements some physical layer processing functions, RF processing, and active antenna-related functions. RRC layer information ultimately becomes PHY layer information, or is converted from PHY layer information. Therefore, in this architecture, higher-layer signaling (such as RRC layer signaling) can also be considered to be sent by the DU, or by both the DU and the AAU. It is understood that the access network equipment can include one or more of a CU node, a DU node, or an AAU node. In addition, the CU may be classified as an access network device in an access network (radio access network, RAN), or the CU may be classified as an access network device in a core network (core network, CN), which is not limited in this application.

[0157] The following is an explanation of some nouns or terms used in the embodiments of the present application, which are also considered part of the content of the invention.

[0158] 1. Orthogonal Frequency Division Multiplexing (OFDM): A type of multi-carrier modulation. The main idea is to divide a wider carrier into several orthogonal subcarriers, converting high-speed data signals into parallel low-speed sub-data streams, and modulating them to transmit on each subcarrier.

[0159] 2. Carrier: A radio wave of a specific frequency band that is modulated to transmit a signal, or an electromagnetic wave of a certain bandwidth.

[0160] 3. Subcarrier: In the OFDM system, a subcarrier is obtained by dividing a carrier of a certain bandwidth.

[0161] 4. Subcarrier spacing (SCS): The width of a subcarrier, usually 15kHz or multiples of 15kHz, where kHz stands for kilohertz.

[0162] 5. Symbol: A time domain signal within a certain duration. In the OFDM system, it refers to the OFDM symbol. The length of each OFDM symbol is usually the inverse of the subcarrier spacing. For example, the symbol length corresponding to a 15kHz SCS is 66.7 microseconds (us).

[0163] 6. Frequency band: A frequency domain resource of a certain width, which can be a carrier, a bandwidth part (BWP), or a set of resource blocks (RBs), where one RB includes 12 subcarriers.

[0164] 7. Resources: including time domain resources, frequency domain resources, etc. Time domain resources include symbols, symbol groups, time slots, mini-slots, etc., where symbols can be OFDM symbols, or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols, or orthogonal time frequency space (OTFS) waveform symbols. Frequency domain resources include subcarriers, resource elements, subchannels, interlace units, interlace groups, or resource blocks (RB) sets. Among them, a subchannel can be a plurality of continuous physical resource blocks (PRBs) in the frequency domain, for example, 10 consecutive PRBs are a subchannel, or 100 consecutive PRBs are a subchannel. An interleaving unit can be a plurality of non-continuous and equally spaced REs or a plurality of non-continuous and equally spaced PRBs in the frequency domain. The embodiments of the present application do not restrict the minimum granularity of time domain resource and frequency domain resource allocation. For example, the minimum granularity of time domain resources can be 1 symbol, 1 symbol group, mini-slot, time slot, etc. The minimum granularity of frequency domain resources can be 1 subcarrier or 1 RE, or 1 interleaving unit.

[0165] 8. Resource pool: A collection of time-frequency resources used for sidelink transmission, for example, including several time slots and sub-channels.

[0166] 9. Reference Signal: A known signal provided by the transmitter to the receiver for channel estimation or channel sounding. A known signal means its frequency domain location, time domain location, transmitted content, and power are known.

[0167] 10. Comb: This refers to a frequency domain mapping method in which a signal occupies subcarriers at equal intervals in the frequency domain. A comb size of M means that every M subcarriers occupy one subcarrier, meaning that the interval between every two occupied subcarriers is Δf = MΔf0, where Δf0 is the subcarrier spacing for the frequency band. When M = 1, the signal occupies consecutive subcarriers in the frequency domain, meaning it is continuously mapped across the frequency band.

[0168] In particular, “the comb teeth are M,” “the comb value is M,” “the size of the comb teeth is M,” “the interval between the comb teeth is M,” and “M comb teeth” are understood to have the same meaning.

[0169] 11. Multipath aliasing: Also known as spectral aliasing, this refers to the phenomenon of high-frequency components mixing with low-frequency components when the sampling frequency is below the Nyquist rate (undersampling), causing spectral distortion. In the present application, this can also be understood as delay-spectral aliasing. When undersampling occurs in the frequency domain, distant and close targets alias together in the delay domain.

[0170] 12. Reflected signal: refers to the signal reflected back to the receiver after the reference signal is transmitted to the sensing target object. The "reflection" here includes the reflection, scattering, and diffraction of electromagnetic waves.

[0171] In the perception scenario, different business requirements have corresponding maximum unambiguous ranging range R max , Maximum unambiguous speed measurement range V max , and the performance requirements of ranging resolution ΔR. For example, at a carrier frequency of 60 GHz, to achieve an unambiguous speed measurement range V of 1 m / s max and the ranging resolution ΔR is 0.1m, then the time domain interval of sending the reference signal is T P No more than 2.5ms, bandwidth B is 1.5GHz; if the maximum unambiguous ranging range R of 150m is to be achieved max , the frequency domain interval Δf for sending the reference signal is at most 1 MHz. When the subcarrier spacing is 480 kHz, the comb tooth size used by the reference signal can be 2.

[0172] As shown in FIG2 , an embodiment of a reference signal transmission method provided in an embodiment of the present application includes:

[0173] 201. A first device sends a first reference signal, where the first reference signal is mapped onto a first frequency band using a first comb tooth of size M, where M is a positive integer.

[0174] Referring to Figure 3 , reference signals are sent in chronological order. In the scenario shown in Figure 3 , subcarrier 301 represents an unoccupied subcarrier / RE in the frequency band, and subcarrier 302 represents an occupied subcarrier / RE in the frequency band. The first device first transmits a first reference signal RS1 with a small comb tooth size for maximum unambiguous ranging.

[0175] For example, RS1 uses 2 comb teeth. In order to achieve the ranging resolution of 0.1m required by the business, the bandwidth of RS1 is not less than 1.5GHz, where the value of M only needs to meet the maximum unambiguous ranging range required by the business, and the specific value is not limited here.

[0176] 202. The first device periodically sends a second reference signal, where the second reference signal is mapped onto a second frequency band with a second comb tooth of size N. The bandwidth of the second frequency band is the same as the bandwidth of the first frequency band, and N>M.

[0177] After sending RS1, the first device periodically sends a second reference signal RS2 with a larger comb-teeth size at time intervals of T2.

[0178] It should be noted that in the embodiment of the present application, "sending a reference signal" and "sending a reference signal once" can be understood as the same meaning, and "sending one / times a reference signal" can occupy one symbol in the time domain, or it can occupy multiple symbols continuously to improve the received signal-to-noise ratio. For example, "sending one / times a reference signal" can occupy one symbol group in the time domain, or occupy one micro slot, or occupy one time slot.

[0179] Optionally, each reference signal may be generated based on at least one sequence, and the sequence may be, for example, a ZC sequence, an m sequence, a Gold sequence, or the like.

[0180] Exemplarily, RS2 uses 4 comb teeth, T2 is 2.5ms, the first frequency band and the second frequency band are the same frequency band, wherein the specific value of N only needs to meet the above agreement, and the specific value is not limited here, and the value of T2 only needs to meet the maximum unambiguous speed measurement range required by the business, and the specific value is not limited here.

[0181] In particular, the first frequency band and the second frequency band may be different frequency bands, as long as the bandwidth of the first frequency band is the same as the bandwidth of the second frequency band. It is understood that when the difference between the bandwidth of the first frequency band and the bandwidth of the second frequency band is very small, the ranging resolution of RS1 and the ranging resolution of RS2 are approximately equal. Therefore, "the bandwidth of the first frequency band is the same as the bandwidth of the second frequency band" includes a slight error between the bandwidth of the first frequency band and the bandwidth of the second frequency band.

[0182] In particular, the first reference signal and the second reference signal may be perception reference signals, or other types of signals, such as positioning reference signals, or communication signals.

[0183] In particular, the embodiment of the present application suggests that the value of N is an integer multiple of the value of M. Such a value selection method helps to match the unambiguous ranging results and the unambiguous speed measurement results in a multi-target scenario.

[0184] In particular, when the value of N is an integer multiple of the value of M, the time interval between the sending time of RS1 and the sending time of the first RS2 can also be equal to T2. In this way, the RE in RS1 that occupies the same subcarrier as RS2 can be regarded as a single transmission of the periodic signal RS2, and can also be used for unambiguous speed measurement.

[0185] Specifically, if you need to continuously monitor the position and speed of a perceived target, send a second RS1 after a T1 interval between the first RS1. T1 is the time during which the distance to the perceived target will not change significantly. For example, at a ranging resolution of 0.1m and a speed of 1m / s, the ranging result will typically remain constant for 0.1 / 1 = 0.1s = 100ms.

[0186] It is understandable that the above is only an example. In actual applications, due to different business requirements, the required maximum unambiguous ranging range R max , Maximum unambiguous speed measurement range V max , and the ranging resolution ΔR will also be different. When actually sending the reference signal, the comb tooth size used by the reference signal, the bandwidth of the reference signal and the transmission period of RS2 will change accordingly, which are not limited here.

[0187] It should be noted that "RS1" and "RS2" are only general terms for the first reference signal and the second reference signal sent, and do not specifically refer to one or some reference signals. In actual applications, the sent reference signals may not be called "RS1" and "RS2", but may be replaced by other names. The specific names are not limited here. In the embodiments of this application, only "RS1" and "RS2" are used as examples for illustration.

[0188] Next, the embodiments of the present application focus on explaining how to achieve one-to-one matching of multi-target ranging and speed measurement results under the aforementioned reference signal sending method.

[0189] Please refer to Figure 4. Based on RS1, unambiguous ranging results can be obtained. Different grid points represent different distances. Grid points with patterns indicate that a target has been detected at that distance, and different patterns represent different targets. RS2 can obtain ambiguous ranging results while performing unambiguous speed measurement. The measurement results of RS2 in the figure can be expressed as a two-dimensional distance-velocity diagram (RV diagram), in which the horizontal axis represents distance and the vertical axis represents speed. Grid points with patterns indicate that a target has been detected at that distance and speed. Considering that the bandwidth of RS2 is the same as that of RS1, the ranging resolution of RS1 and RS2 is the same, that is, in the ranging results of RS1 and RS2, each grid point represents the same unit distance.

[0190] It is understandable that although the bandwidth of the reference signal affects the ranging resolution, in actual applications, even if there is a slight error between the bandwidth of RS1 and the bandwidth of RS2, it will not affect the matching of the unambiguous ranging result of RS1 and the unambiguous speed measurement result of RS2.

[0191] RS1 uses small comb teeth, which corresponds to the maximum unambiguous ranging range R max,1 The target distance required by the business in the perception scenario has been covered. Without considering the ranging error, the unambiguous ranging result R1 obtained based on RS1 can represent the true distance of the target. RS2 uses large comb teeth, and its corresponding maximum unambiguous ranging range is smaller, and the ranging result may be blurred (for example, targets D and E in Figure 4). If the blurred ranging result obtained based on RS2 is R2, then the relationship between R1 and R2 is as described in formula (1):

[0192] R1=R2+K*R max,2

[0193] where R max,2 It represents the maximum unambiguous ranging range corresponding to RS2, which can also be called ambiguity. K is a non-negative integer.

[0194] For each target, if a unique K value can be found to satisfy formula (1), then R2 corresponding to the ranging result R1 of the target in RS1 can be determined.

[0195] Based on RS2, the unambiguous speed measurement result V of each target can also be obtained. First, the unambiguous ranging result R1 of RS1 and the ambiguous ranging result R2 of RS2 are matched according to formula (1), thereby further achieving the matching of the unambiguous ranging result R1 of RS1 and the unambiguous ranging and speed measurement result V of RS2.

[0196] For example, as shown in FIG4, according to the measurement results of RS1, 5 unambiguous ranging results are obtained, namely and According to the measurement results of RS2, 5 fuzzy distance measurement results and corresponding unfuzzy speed measurement results are obtained, which are and At this point, for targets A, B, and C, a unique K value can be determined, and when K = 0, formula (1) is satisfied. For targets D and E, a unique K value can be determined, and when K = 1, formula (1) is satisfied. This allows us to obtain the unambiguous distance measurement result R1 and unambiguous velocity measurement result V for each target.

[0197] It should be noted that the ranging result of the perceived target can be understood as the delay of each path in the channel state information estimated by the received reflected signal and the transmitted reference signal, and the speed measurement result of the perceived target can be understood as the Doppler of each path in the channel state information estimated by the received reflected signal and the transmitted reference signal.

[0198] Specifically, for a scenario of self-transmission and self-reception, the delay of each path is determined by the distance between the sensing target and the first device, and the ranging result of the sensing target can be understood as the distance between the sensing target and the first device.

[0199] Specifically, for the scenario of self-transmission and other-reception, the delay of each path is determined by the distance between the perception target and the first device and the distance between the perception target and the second device. The ranging result of the perception target can be understood as the sum of the distance between the perception target and the first device and the distance between the perception target and the second device.

[0200] In an embodiment of the present application, RS2 with a larger comb tooth size is used to measure the speed of the perception target, thereby reducing the occupancy of subcarriers in the frequency domain, and reducing the reference signal overhead while meeting the detection requirements of the perception target.

[0201] However, in some cases, the ranging results based on RS2 may be aliased due to ambiguity. As shown in Figure 5, targets B and D are aliased in the ranging results of RS2. In this case, the unambiguous ranging results for targets B and D based on RS1 are and The fuzzy ranging result based on RS2 is And two speed measurement results, respectively V B′ and V D′ At this time, for target B and target D, there are two values ​​of K that make formula (1) valid. For example, when K = 0, When K=1, Therefore, there will be two matching situations of unambiguous distance measurement results and unambiguous speed measurement results, namely or

[0202] To resolve the issue of unambiguous ranging and velocity measurement results not matching one-to-one, we first need to analyze the causes of multipath aliasing in RS2 ranging:

[0203] Assuming that RS1 uses M comb teeth and RS2 uses N comb teeth, N>M, the frequency domain spacing of RS1 Δf1=MΔf0, the frequency domain spacing of RS2 Δf2=NΔf0, Δf0 can be regarded as SCS, or the frequency domain spacing between two subcarriers with adjacent indices in the same resource pool. The unambiguous ranging range corresponding to ranging using RS1 is The unambiguous ranging range corresponding to RS2 ranging is RS1 and RS2 have the same bandwidth B, that is, B = S1Δf1 = S2Δf2 = S1MΔf0 = S2NΔf0, and the ranging resolution ΔR of the two is equal, that is Where S1 and S2 represent the number of subcarriers / REs occupied by transmitting RS1 and RS2 once within bandwidth B, respectively. Both S1 and S2 are non-negative integers.

[0204] Assume that the target x and target y are R in the ranging results of RS1. x and R y , the difference between the two is tΔR, where t=1,2,...,S1-1. x and R y The difference is exactly the maximum unambiguous ranging range R of RS2 max,2 When it is an integer multiple of tΔR%R max,2 =0, R x and R y The same ranging results are obtained under RS2, namely R x %R max,2 =R y %R max,2 At this time, target x and target y will be aliased in the ranging result of RS2.

[0205] For example, if the distance measurement results of target x and target y are 5m and 80m respectively in RS1, the maximum unambiguous distance measurement range R of RS2 is max,2 The target x and y are both 5m in the distance measurement result R2 of RS2, that is, for R max,2 In terms of x and R y They have the same remainder 5. At this point, the targets x and y cannot match the unambiguous distance measurement results and the unambiguous speed measurement results.

[0206] Based on the above analysis, we can know that multipath aliasing occurs because the distance difference between the two targets is the maximum unambiguous ranging range R of RS2. max,2An integer multiple of .

[0207] To address this issue, the present invention provides two solutions:

[0208] 1. Determine another R max , so that the distance difference between any two targets will not be the same as the two R max It is an integer multiple relationship.

[0209] Since the distance difference between two targets in the actual scene cannot be constrained, it is necessary to ensure that the unambiguous ranging results and unambiguous speed measurement results can be matched one-to-one under any distance difference. To achieve this goal, the embodiment of the present application proposes to send another RS3 with a comb tooth size different from RS2. It only needs to ensure that the greatest common divisor between the comb tooth size N used by RS2 and the comb tooth size X used by RS3 is not greater than the comb tooth size M used by RS1, so that the distance difference between any two targets is different from the maximum unambiguous ranging range R of RS2. max,2 and RS3's maximum unambiguous ranging range R max,3 The relationship is an integer multiple, that is, any two targets in the perception scene will not be aliased in the fuzzy ranging results of RS2 and the fuzzy ranging results of RS3 at the same time, thereby further ensuring that the unambiguous ranging results and the unambiguous speed measurement results in the multi-target scene are matched one to one.

[0210] The proof process is as follows:

[0211] The goal can be seen as: "For any distance difference tΔR, tΔR%R is satisfied max,2 ≠0 or tΔR%R max,3 ≠0”, in order to find the conditions for the above objectives to be met, we first need to find “t has a certain value such that tΔR%R max,2 =0 and tΔR%R max,3 =0". Since RS2 and RS3 occupy the same bandwidth B as RS1, they have the same ranging resolution. Where S2 represents the number of subcarriers / REs occupied by sending RS2 once within bandwidth B, and S3 represents the number of subcarriers / REs occupied by sending RS3 once within bandwidth B. Both S2 and S3 are non-negative integers.

[0212] The maximum unambiguous ranging ranges for RS2 and RS3 are and According to ΔR and R max,2 、R max,3 From the expression of R max,2 =S2ΔR,R max,3 =S3ΔR.

[0213] Therefore, we need to "make tΔR%Rmax,2 =0 and tΔR%R max,3 =0" is true, which is equivalent to "such that t%S2=0 and t%S3=0" is true. Considering that the value range of t is *1,2,...,S1-1+, if we want to solve the condition "there is a value of t such that t%S2=0 and t%S3=0" is true, we only need to let S1-1≥the least common multiple of (S2,S3), that is, S1>the least common multiple of (S2,S3).

[0214] Therefore, in order to make "for any distance difference tΔR, tΔR%R is satisfied max,2 ≠0 or tΔR%R max,3 ≠0” is established, it is necessary to ensure that S1≤(S2,S3)’s least common multiple. Let A=S1M=S2N=S3X, then it is necessary to ensure The least common multiple of (N, X). Further let p be the greatest common divisor of (N, X), we can get N = pn1 and X = pn2, where n1 and n2 are relatively prime, and pn1n2 is the least common multiple of (N, X). Let q be the greatest common divisor of (M, pn1n2), we can get M = qm. Considering that A is the common multiple of (M, N, X), A = Zmpn1n2, then Since n1 and n2 are coprime, The least common multiple of can be written as Zmn1n2, so The least common multiple of (N, X) can be expressed as p≤qm, that is, the greatest common divisor of (N, X) ≤ M. The aforementioned symbols p, n1, n2, q, m, Z, etc. are all positive integers.

[0215] Based on the above proof, it can be seen that when the greatest common divisor of the two large comb teeth N and X used by RS2 and RS3 is less than or equal to the small comb tooth M used by RS1, one-to-one matching of multi-target unambiguous ranging and unambiguous speed measurement results can be achieved based on the two types of reference signals proposed in the present invention.

[0216] Specifically, when the value of M is 1, the values ​​of N and X are relatively prime.

[0217] Specifically, the frequency domain transmission intervals of RS2 and RS3 can be set to always be integer multiples of the frequency domain transmission interval of RS1, that is, N = Z1M, X = Z2M, where Z1 and Z2 are both positive integers. This allows the aforementioned constraints to be reduced to Z1 and Z2 being mutually prime. For example, when M is 2, (N, X) = (4, 6), (N, X) = (6, 8), or (N, X) = (4, 10), etc.; when M is 3, (N, X) = (6, 9), (N, X) = (9, 12), or (N, X) = (6, 15), etc. This approach facilitates the matching calculation of unambiguous ranging and unambiguous velocity measurement results in multi-target scenarios.

[0218] It is worth noting that for the spontaneous transmission and reception scenario, the distance measured based on the reference signal can be understood as the sum of the distance between the sensing target and the first device and the distance to the second device. In this case, the ranging resolution and the maximum unambiguous ranging range can be expressed as and It is understandable that the above proof process and conclusions are still applicable to this scenario.

[0219] There are two sending methods for RS2 and RS3:

[0220] 1. Send RS2 with comb N and RS3 with comb X on different symbols:

[0221] Referring to FIG. 6 , an embodiment of a reference signal sending method provided in an embodiment of the present application includes:

[0222] 601. A first device sends a first reference signal, where the first reference signal is mapped onto a first frequency band using a first comb tooth of size M, where M is a positive integer.

[0223] 602. The first device periodically sends a second reference signal, where the second reference signal is mapped onto a second frequency band using a second comb tooth of size N, where the bandwidth of the second frequency band is the same as the bandwidth of the first frequency band, and N>M;

[0224] Steps 601 to 602 in this embodiment are similar to steps 201 to 202 in the embodiment shown in FIG. 2 , and are not described in detail here.

[0225] 603. The first device periodically sends a third reference signal, where the third reference signal is mapped onto a third frequency band with a third comb tooth of size X. The bandwidth of the third frequency band is the same as the bandwidth of the first frequency band, X>M, X≠N, and the greatest common divisor of (N,X)≤M.

[0226] Please refer to FIG. 7 . The reference signals are sent in a time sequence. In the scenario shown in FIG. 7 , subcarrier 701 represents an unoccupied subcarrier / RE on the frequency band, and subcarrier 702 represents an occupied subcarrier / RE on the frequency band.

[0227] After sending one RS1, a second reference signal RS2 and a third reference signal RS3 with larger comb tooth sizes are periodically sent at time intervals of T2. The greatest common divisor of the comb tooth sizes of RS2 and RS3 is less than or equal to the comb tooth size of RS1.

[0228] For example, RS3 uses 6 comb teeth, T2 is 2.5ms, the first frequency band, the second frequency band and the third frequency band are the same frequency band, the comb tooth size of RS2 "4" and the comb tooth size of RS3 "6", their greatest common divisor is 2, which is not greater than the comb tooth size of RS1 "2", among which, as long as the values ​​of M, N and X meet the above agreement, the specific values ​​are not limited here.

[0229] In particular, the first, second, and third frequency bands can also be different frequency bands, as long as their bandwidths are the same. It is understood that when the bandwidth difference between any two frequency bands is small, the ranging resolutions of RS1, RS2, and RS3 are approximately equal. Therefore, "the bandwidths of the three bands are the same" includes "a slight difference between the bandwidths of any two frequency bands."

[0230] It should be noted that "RS1", "RS2" and "RS3" are just general terms for the first reference signal, second reference signal and third reference signal sent, and do not specifically refer to one or some reference signals, nor do they limit the order of transmission. In actual applications, the reference signals sent may not be called "RS1", "RS2" and "RS3", but replaced by other names. The specific names are not limited here. In the embodiments of this application, only "RS1", "RS2" and "RS3" are used as examples for illustration.

[0231] It is understandable that the bandwidth of the reference signal affects the ranging resolution. In practical applications, even if there is a slight error between the bandwidth of RS1 and the bandwidth of RS2 or RS3, it will not affect the matching of the unambiguous ranging result of RS1 and the unambiguous speed measurement result of RS2 or the unambiguous speed measurement result of RS3.

[0232] For example, referring to FIG8 , the maximum unambiguous ranging range of RS3 is R max,3 ,R max,3 With R max,2 The values ​​of are different. In this case, multipath aliasing occurs between targets B and D in the ranging result of RS2, but not in the ranging result of RS3. However, multipath aliasing occurs between targets A and D in the ranging result of RS3. According to the aforementioned proof process, if the paths corresponding to any two targets are aliased in the ranging result of RS2, they will not be aliased in the ranging result of RS3, and vice versa. Therefore, the intersection of the two preliminary matching result sets yields a unique speed measurement result.

[0233] Specifically, according to RS1, 5 unambiguous ranging results are obtained, namely and The fuzzy distance measurement results and the corresponding unfuzzy speed measurement results obtained according to RS2 are and The fuzzy distance measurement results and the corresponding unfuzzy speed measurement results obtained according to RS3 are and

[0234] At this time, the target B that is aliased in the ranging result of RS2 can obtain its unambiguous ranging result and unambiguous speed measurement result by matching the ranging result of RS1 with the ranging result of RS3. For target A that is aliased in the ranging result of RS3, its unambiguous ranging result and unambiguous speed measurement result can be obtained by matching the ranging result of RS1 with the ranging result of RS3. For target D that is aliased in both RS2 and RS3 ranging results, we can also first obtain the preliminary matching result set of RS1 and RS2. And the preliminary matching result set of RS1 and RS3 Let the two preliminary matching sets intersect, and then we can get the unique unambiguous distance measurement result and unambiguous speed measurement result of target D.

[0235] To ensure consistency between RS2 and RS3 speed measurement results, each RS3 can correspond to an RS2, and the time interval between sending an RS2 and its corresponding RS3 cannot be too far apart, that is, it cannot fall within the time range where significant changes occur in the ranging results of the perceived target. For example, RS2 and RS3 can be sent on different symbols in the same time slot, or in adjacent time slots, which is not limited in this application.

[0236] In an embodiment of the present application, each time the first device sends an RS2 and a corresponding RS3, it can be regarded as sending a group of reference signals that can solve multi-target multipath aliasing. Compared with the method of directly periodically sending RS1 in the prior art, the reference signal sending method of the embodiment of the present application can also reduce the reference signal overhead.

[0237] For example, taking the values ​​of (M, N, X) as (2, 4, 6), without loss of generality, consider a transmission bandwidth of 24 subcarriers, with subcarrier numbers 0, 1, ..., 23. Transmitting one RS1 occupies 12 subcarriers (0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22), while transmitting a group of RS2 and RS3 occupies a total of 10 subcarriers (0, 4, 8, 12, 16, 20) and (0, 6, 12, 18). Compared to transmitting a single RS1, transmitting a group of RS2 and RS3 reduces overhead by approximately 16.7% ((12 - 10) / 12). It is understandable that the actual transmission bandwidth will be larger, but the proportion of overhead reduction hardly changes with bandwidth.

[0238] 2. Send RS2 with comb N and RS3 with comb X on the same symbol:

[0239] Furthermore, RS2 and RS3 can be sent on the same symbol. It's worth noting that in this transmission method, to reduce reference signal overhead, RS2 and RS3 need to be mapped to the same frequency band. That is, the second and third frequency bands are the same, and the mapping starting subcarriers corresponding to RS2 and RS3 are the same, which can also be understood as the same comb offset. In this case, RS3 can also be considered part of RS2, meaning that RS2 uses two different comb teeth, N and X.

[0240] Optionally, when RS2 uses two different comb teeth N and X, it can be understood that the first device generates two sub-reference signals RS21 and RS22 based on two different sequences, respectively. RS21 and RS22 are mapped on the same frequency band with comb teeth N and comb teeth X respectively, and RS21 and RS22 together constitute RS2.

[0241] As shown in FIG9 , reference signals are sent in time sequence. In the scenario shown in FIG9 , subcarrier 901 represents an unoccupied subcarrier / RE on the frequency band, and subcarrier 902 represents an occupied subcarrier / RE on the frequency band.

[0242] For example, taking the value of (M, N, X) as (2, 4, 6), without loss of generality, consider a transmission bandwidth of 24 subcarriers, with subcarrier numbers 0, 1, ..., 23. Sending one RS1 occupies 12 subcarriers (0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22). At this time, RS2 uses both comb sizes of 4 and 6, and sending one RS2 occupies 8 subcarriers (0, 4, 6, 8, 12, 16, 18, 20). Comb teeth 4 and 6 used by RS2 correspond to the same mapping start subcarrier, that is, comb offset = 0. Subcarriers numbered as common multiples of the two sizes can be considered as duplicate occupancy. Compared to sending one RS1, sending one RS2 can reduce overhead by approximately 33.3% ((12-8) / 12).

[0243] Compared to sending RS2 and RS3 separately in different symbols, this combined transmission method can further reduce the reference signal overhead. When receiving this combined reference signal, the receiver only needs to process the received signal according to size N and size X respectively, and can also obtain the results shown in Figure 8.

[0244] It is worth noting that in some special scenarios, such as sidelink scenarios, time-frequency resources are always allocated / selected for use within a resource pool, and the resource indication method is relatively limited. The resource pool may be (pre)configured with one or more available comb mapping methods. To send the reference signal proposed in the embodiment of the present application, the comb size that can be used by the resource pool can be (pre)configured with a common multiple of (M, N, X).

[0245] For example, taking (M, N, X) as (2, 6, 8), the resource pool can be (pre-)configured to use 24 comb teeth. This allows for sending signals at frequency domain intervals corresponding to 2 / 6 / 8 comb teeth. For example, when sending RS1, 12 groups of 24-comb-tooth subcarrier sets with comb offset = 0, 2, 4, ..., 22 can be simultaneously occupied. Taking the example of sending reference signals of comb teeth N and comb teeth X on the same symbol, when sending RS2, 6 groups of 24-comb-tooth subcarrier sets with comb offset = 0, 6, 8, 12, 16, 18 can be simultaneously occupied. In this way, RS2 can simultaneously implement 6-comb and 8-comb mapping, further reducing reference signal overhead.

[0246] In addition, in the side link scenario, some time slots in the resource pool can be (pre-)configured to use M comb teeth, some time slots to use N comb teeth, and some time slots to use X comb teeth, or some symbols in the resource pool can be (pre-)configured to use M comb teeth, some symbols to use N comb teeth, and some symbols to use X comb teeth. In this way, RS1, RS2, and RS3 can respectively select the corresponding time slots / symbols to send.

[0247] Exemplarily, the 1st to 4th symbols in each time slot of the resource pool may be (pre-)configured to use M comb teeth, the 5th to 8th symbols to use N comb teeth, and the 9th to 12th symbols to use X comb teeth.

[0248] It can be understood that whether the resource pool is limited or not does not change the manner in which the reference signal is sent in the embodiment of the present application.

[0249] In particular, the embodiments of the present application mainly solve the problems of ranging and speed measurement in multi-target scenarios, but the proposed solution is still applicable in single-target scenarios. After determining that it is a single-target scenario, RS2 can be simplified to include only one large comb tooth structure, which is only used for speed measurement. The combination of the unambiguous ranging result obtained based on RS1 and the unambiguous speed measurement result obtained based on RS2 is the distance and speed of the target, and there will be no mismatch.

[0250] In addition, the embodiment of the present application does not exclude the method that RS2 includes more than two comb tooth sizes, that is, RS2 can adopt two or more comb tooth structures, as long as the greatest common divisor of any two comb tooth sizes in the two or more comb tooth structures is not greater than M.

[0251] In addition to the above solutions, the present invention also provides another solution:

[0252] 2. Determine an R whose distance difference to any two targets is not an integer multiple max .

[0253] From the above derivation process, we can know that aliasing occurs mainly because there are two targets with a distance difference of RS2 and an unambiguous ranging range R max,2 That is, whether multipath aliasing occurs depends on the actual distance of each target and the comb teeth used by RS2. If the distance of each target can be obtained before sending RS2, a large comb tooth where multipath aliasing will not occur can be selected as the comb tooth of RS2.

[0254] The reference signal sending method provided in the embodiment of the present application can be executed by the above-mentioned access network device or terminal device, or can be executed by a chip in the above-mentioned access network device or terminal device. The reference signal sending method of the present application is introduced below with reference to the accompanying drawings.

[0255] Referring to FIG. 10 , an embodiment of a reference signal sending method provided in an embodiment of the present application includes:

[0256] 1001. A first device sends a first reference signal, where the first reference signal is mapped onto a first frequency band using a first comb tooth of size M, where M is a positive integer.

[0257] Step 1001 in this embodiment is similar to step 601 in the embodiment shown in FIG. 6 , and will not be described in detail here.

[0258] 1002. The first device receives a measurement result of a first reference signal;

[0259] After sending RS1, RS2 is not sent directly. Instead, the unambiguous ranging result of RS1 is received first. By analyzing the distance difference tΔR between each target in the perception scene, a target is selected that does not meet tΔR%R for all tΔR. max,2 =0, and then execute step 1003.

[0260] For the scenario of self-transmission and self-reception, the first device can adjust the comb tooth size used by RS2 after receiving the unambiguous ranging result from RS1;

[0261] For the scenario of self-transmission and other-reception, the second device is required to send an indication message to the first device that sends the reference signal after receiving the reflected signal. The indication message can be the sum of the distances of all perceived targets from the first device and the distances from the second device, or the indication message can be the distance difference between each two perceived targets (multi-target scenario), or the second device can analyze the ranging results by itself, and the indication message can be the comb tooth size N value that will not cause multipath aliasing, or the receiving device reports the result to the server, and then the server sends the indication message to the sending device. The specific implementation method is not limited here.

[0262] The server in the embodiment of the present application can be a location management function (LMF) or a sensing function (SF), and the specific details are not limited here.

[0263] 1003. The first device periodically sends a second reference signal, where the second reference signal is mapped onto a second frequency band using a second comb tooth of size N, where the bandwidth of the second frequency band is the same as the bandwidth of the first frequency band, and N>M;

[0264] Step 1003 in this embodiment is similar to step 602 in the embodiment shown in FIG. 6 , and will not be described in detail here.

[0265] It is understandable that the comb tooth size N that does not cause multipath aliasing cannot be obtained in all cases. If there is no suitable comb tooth size N, step 1003 is not performed and step 1004 is performed.

[0266] 1004. The first device periodically sends a second reference signal, and the second reference signal is mapped to a second frequency band with a second comb tooth of size N and size X. The bandwidth of the second frequency band is the same as the bandwidth of the first frequency band, N>M, X>M, N≠X, and the greatest common divisor of (N, X) ≤M.

[0267] The first device sends RS2 including comb teeth of sizes N and X according to the unambiguous ranging result, so that the distance difference tΔR between each two targets in the perception scene satisfies tΔR%R max,2 ≠0 or tΔR%R max,3 ≠0, where R max,2 is the maximum unambiguous ranging range corresponding to the comb tooth size N, R max,3 is the maximum unambiguous ranging range corresponding to the comb tooth size X.

[0268] Specifically, RS2 with a comb tooth size of N and RS3 with a comb tooth size of X may also be sent in different symbols, and the specific implementation method is not limited here.

[0269] In the embodiment of the present application, by analyzing the ranging results of RS1, the comb tooth size N that will not cause multipath aliasing is determined, which is expected to further reduce the reference signal overhead while achieving matching between the unambiguous ranging results and the unambiguous speed measurement results of any target.

[0270] The above describes the communication system and reference signal transmission method according to the embodiments of the present application. The following describes the communication device provided by the embodiments of the present application. Please refer to Figure 11A, which is a schematic diagram of the structure of the communication device according to the embodiments of the present application. Communication device 1100 can be used to perform the steps in the embodiments shown in Figures 2 to 10. For details, please refer to the relevant description of the above method embodiments.

[0271] The communication device 1100 includes a transceiver module 1101 and a processing module 1102. The transceiver module 1101 can implement corresponding communication functions, and the processing module 1102 is used to process data. The transceiver module 1101 can also be called a communication interface or a communication unit.

[0272] Optionally, the communication device 1100 may further include a storage unit, which may be used to store instructions and / or data. The processing module 1102 may read the instructions and / or data in the storage unit so that the communication device implements the aforementioned method embodiment.

[0273] The communication device 1100 can be used to perform the actions described in the method embodiments described above. The communication device 1100 can be a terminal device / access network device, or a component that can be configured in a terminal device / access network device. The transceiver module 1101 is used to perform the reception-related operations described in the method embodiments described above, and the processing module 1102 is used to perform the processing-related operations described in the method embodiments described above.

[0274] Optionally, the transceiver module 1101 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiment. The receiving module is used to perform the receiving operation in the above method embodiment.

[0275] It should be noted that the communication device 1100 may include a sending module but not a receiving module. Alternatively, the communication device 1100 may include a receiving module but not a sending module. The specific implementation depends on whether the above solution executed by the communication device 1100 includes a sending action and a receiving action.

[0276] The processing module 1102 in the above embodiment can be implemented by at least one processor or processor-related circuit. The transceiver module 1101 can be implemented by a transceiver or transceiver-related circuit. The transceiver module 1001 can also be referred to as a communication unit or communication interface. The storage unit can be implemented by at least one memory.

[0277] The present application also provides another communication device 1100. As shown in FIG11B , the communication device 1100 includes a processor 1110 coupled to a memory 1120. The memory 1120 is configured to store computer programs, instructions, and / or data. The processor 1110 is configured to execute the computer programs, instructions, and / or data stored in the memory 1120, thereby executing the method described in the above method embodiment.

[0278] Optionally, the communication device 1100 includes one or more processors 1110.

[0279] Optionally, as shown in FIG11B , the communication device 1100 may further include a memory 1120 .

[0280] Optionally, the communication device 1100 may include one or more memories 1120 .

[0281] Optionally, the memory 1120 may be integrated with the processor 1110 or provided separately.

[0282] 11B , the communication device 1100 may further include a transceiver 1130 , which is configured to receive and / or transmit signals. For example, the processor 1110 is configured to control the transceiver 1130 to receive and / or transmit signals.

[0283] As a solution, the communication device 1100 is used to implement the operations in the above method embodiments.

[0284] For example, the processor 1110 is used to implement processing-related operations in the above method embodiments, and the transceiver 1130 is used to implement transmission-related operations in the above method embodiments.

[0285] The present application also provides a communication device 1100, which can be a terminal device / access network device or a chip in the terminal device / access network device. The communication device 1100 can be used to perform the operations in the above method embodiments.

[0286] When the communication device 1100 is a communication device, Figure 11C shows a simplified structural diagram of the communication device. As shown in Figure 11C, the communication device includes a processor, a memory, and a transceiver, wherein the memory can store computer program code, and the transceiver includes a transmitter 1131, a receiver 1132, a radio frequency circuit (not shown in the figure), an antenna 1133, and an input / output device (not shown in the figure). The processor is mainly used to process communication protocols and communication data, as well as to control the communication device, execute software programs, and process software program data. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used to convert baseband signals into radio frequency signals and process radio frequency signals. The antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input / output devices, such as a touch screen, display screen, keyboard, etc., are mainly used to receive data input by the user and output data to the user. It should be noted that some types of communication devices may not have input / output devices.

[0287] When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, only one memory, processor, and transceiver are shown in Figure 11C. In an actual communication device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be set independently of the processor or integrated with the processor, and this is not limited in the embodiments of the present application.

[0288] In the embodiment of the present application, the antenna and the radio frequency circuit with transceiver functions may be regarded as the transceiver unit of the communication device, and the processor with processing function may be regarded as the processing unit of the communication device.

[0289] As shown in Figure 11C, the communication device includes a processor 1110, a memory 1120, and a transceiver 1130. The processor 1110 may also be referred to as a processing unit, a processing board, a processing module, a processing device, etc., and the transceiver 1130 may also be referred to as a transceiver unit, a transceiver, a transceiver device, etc.

[0290] Alternatively, the device implementing the receiving function in transceiver 1130 may be considered a receiving unit, and the device implementing the transmitting function in transceiver 1130 may be considered a transmitting unit. That is, transceiver 1130 includes a receiver and a transmitter. A transceiver may also be sometimes referred to as a transceiver, a transceiver unit, or a transceiver circuit. A receiver may also be sometimes referred to as a receiver, a receiving unit, or a receiving circuit. A transmitter may also be sometimes referred to as a transmitter, a transmitting unit, or a transmitting circuit.

[0291] It should be understood that FIG11C is merely an example and not a limitation, and the above-mentioned communication device including the transceiver unit and the processing unit may not rely on the structure shown in FIG11C .

[0292] When the communication device 1100 is a chip, the chip includes a processor, memory, and a transceiver. The transceiver can be an input / output circuit or a communication interface; the processor can be a processing unit, microprocessor, or integrated circuit integrated on the chip. The transmission operation of the communication device in the above method embodiment can be understood as the chip's output, and the reception operation of the communication device in the above method embodiment can be understood as the chip's input.

[0293] An embodiment of the present application also provides a computer-readable storage medium on which computer instructions for implementing the method in the above method embodiment are stored.

[0294] For example, when the computer program is executed by a computer, the computer can implement the method performed in the above method embodiment.

[0295] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to implement the method performed in the above method embodiment.

[0296] An embodiment of the present application also provides a communication system, which includes the access network device and terminal device in the above embodiment.

[0297] An embodiment of the present application further provides a chip device, including a processor, configured to call a computer program or computer instruction stored in the memory so that the processor executes the method of the embodiment shown in FIG. 2 to FIG. 10 .

[0298] In a possible implementation, the input of the chip device corresponds to the receiving operation in the embodiments shown in FIG. 2 to FIG. 10 , and the output of the chip device corresponds to the sending operation in the embodiments shown in FIG. 2 to FIG. 10 .

[0299] Optionally, the processor is coupled to the memory via an interface.

[0300] Optionally, the chip device further includes a memory, in which computer programs or computer instructions are stored.

[0301] The processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the method of the embodiments shown in Figures 2 to 10. The memory mentioned in any of the above may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), etc.

[0302] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the explanation and beneficial effects of the relevant contents in any of the communication devices provided above can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0303] In an embodiment of the present application, a terminal device or access network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also known as main memory). The operating system of the operating system layer may be any one or more computer operating systems that implement service processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer may include applications such as a browser, an address book, a word processing software, and an instant messaging software.

[0304] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0305] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0306] The units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0307] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0308] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the part that essentially contributes to the technical solution of the present application or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or an access network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

Claims

1. A reference signal sending method, characterized in that: include: Sending a first reference signal, where the first reference signal is mapped onto a first frequency band with a first comb tooth having a size of M, where M is a positive integer; Periodically sending a second reference signal, wherein the second reference signal is mapped onto a second frequency band with at least one second comb tooth, and a size of each second comb tooth is a positive integer greater than M; The first reference signal and the second reference signal are used to determine a measurement result of a perception target.

2. The method according to claim 1, characterized in that The bandwidth of the second frequency band is the same as the bandwidth of the first frequency band.

3. The method according to claim 1 or 2, characterized in that: Each of the second reference signals is mapped onto the second frequency band with a plurality of second comb teeth, and the greatest common divisor of sizes of every two of the second comb teeth is not greater than M.

4. The method according to claim 3, characterized in that The size of each of the second comb teeth is an integer multiple of M.

5. The method according to claim 3 or 4, characterized in that: When the second reference signal is mapped on the second frequency band using a plurality of second comb teeth, mapping start subcarriers corresponding to different second comb teeth are the same.

6. The method according to claim 1 or 2, characterized in that: When there is one second comb tooth, the size of the second comb tooth is N, and N is a positive integer. The method further includes: A third reference signal is periodically sent, where the third reference signal is mapped onto a third frequency band with a third comb tooth of size X, where X is a positive integer greater than M and not equal to N, and the greatest common divisor of X and N is not greater than M.

7. The method according to claim 6, characterized in that The bandwidth of the third frequency band is the same as the bandwidth of the second frequency band.

8. The method according to claim 6 or 7, characterized in that: Each of the third reference signals corresponds to one of the second reference signals, and a time interval between a sending time of each of the third reference signals and a sending time of the second reference signal corresponding to the third reference signal is less than or equal to a first threshold.

9. The method according to any one of claims 6 to 8, characterized in that Both X and N are integer multiples of M.

10. The method according to any one of claims 1 to 9, characterized in that The time interval between the sending time of the first reference signal and the sending time of the first second reference signal is less than or equal to a second threshold.

11. The method according to any one of claims 1 to 10, characterized in that Before the periodically sending the second reference signal, the method further includes: receiving a first reflection signal, where the first reflection signal is an echo signal reflected by the first reference signal on the sensing target, and the first reflection signal is used to determine a first distance; The size of the second comb teeth is determined according to the first distance.

12. The method according to any one of claims 1 to 10, characterized in that Before the periodically sending the second reference signal, the method further includes: Indication information is received, where the indication information is used to determine a size of the second comb teeth.

13. The method according to claim 12, characterized in that receiving a second reflection signal, where the second reflection signal is a reflection signal of the first reference signal reflected on the sensing target, where there are multiple sensing targets, and the second reflection signal is used to determine a second distance of the different sensing targets; and the indication information includes: a second distance of the different perceived targets; or, The difference between each two of the second distances; or The recommended size of the second comb teeth; The second distances corresponding to the different perception targets or the difference between every two of the second distances are used to determine the size of the second comb teeth.

14. The method according to any one of claims 1 to 13, characterized in that The measurement result for the perceived target includes: a third distance, a fourth distance, and a first speed corresponding to the fourth distance; wherein the third distance is obtained based on the first reference signal, the fourth distance is obtained based on the second reference signal, and the first speed is obtained based on the second reference signal: the moving speed of the perceived target; wherein the perceived target includes one or more; The first comb teeth and the second comb teeth are used to match the third distance in the measurement result with the fourth distance, and to match the first speed corresponding to the fourth distance.

15. The method according to any one of claims 1 to 14, characterized in that The first reference signal is sent periodically, and a sending period of the first reference signal is greater than a sending period of the second reference signal.

16. A reference signal processing method, characterized in that: include: receiving a second reflection signal, where the second reflection signal is a reflection signal of the first reference signal reflected on a sensing target, and the first reference signal is mapped on a first frequency band with a first comb tooth of a size M, where M is a positive integer; receiving a third reflected signal, where the third reflected signal is a reflected signal of a periodically sent second reference signal reflected on the sensing target, wherein each of the second reference signals is mapped on the second frequency band with at least one second comb tooth, and a size of each of the second comb teeth is greater than M; The first reference signal and the second reference signal are used to determine a measurement result of the perception target.

17. The method according to claim 16, characterized in that When the second comb tooth has one, the size of the second comb tooth is N, and the method further includes: A fourth reflected signal is received, where the fourth reflected signal is a reflected signal of a periodically sent third reference signal reflected on the sensing target, wherein each of the third reference signals is mapped on a third frequency band with a third comb tooth of size X, where X is an integer greater than M and not equal to N, and the greatest common divisor of X and N is not greater than M.

18. The method according to claim 16 or 17, characterized in that There are multiple sensing targets, and the method further includes: Determining a second distance of the different sensing targets according to the second reflected signal; According to the second distance, indication information is sent, where the indication information is used to determine the size of the second comb teeth.

19. The method according to claim 18, characterized in that The instruction information includes: the second distance of the different perceived targets; or, The difference between each two of the second distances; or The recommended size of the second comb teeth; The second distances of the different perceived targets or the difference between every two of the second distances are used to determine the size of the second comb teeth.

20. The method according to any one of claims 16 to 19, characterized in that The measurement result for the perceived target includes: a third distance, a fourth distance, and a first speed corresponding to the fourth distance; wherein the third distance is obtained based on the first reference signal, the fourth distance is obtained based on the second reference signal, and the first speed is obtained based on the second reference signal: the moving speed of the perceived target; wherein the perceived target includes one or more; The first comb teeth and the second comb teeth are used to match the third distance in the measurement result with the fourth distance, and to match the first speed corresponding to the fourth distance.

21. A communication device, characterized in that: include: Transceiver module and processing module, The transceiver module is used to perform the sending step or the receiving step in any one of the methods of claims 1 to 15; The processing module is used to execute the steps except the sending step and the receiving step in the method according to any one of claims 1 to 15.

22. A communication device, characterized in that: include: Transceiver module and processing module, The transceiver module is used to perform the sending step or the receiving step in any one of the methods of claims 16 to 20; The processing module is used to execute the steps except the sending step and the receiving step in the method of any one of claims 16 to 20.

23. A communication device, characterized in that: comprising at least one processor coupled to the memory; The memory is used to store programs or instructions; The at least one processor is configured to execute the program or instruction so that the apparatus implements the method according to any one of claims 1 to 15.

24. A communication device, characterized in that: comprising at least one processor coupled to the memory; The memory is used to store programs or instructions; The at least one processor is configured to execute the program or instruction so that the apparatus implements the method according to any one of claims 16 to 20.

25. A communication system, characterized in that: include: A communication device as claimed in claim 23, and a communication device as claimed in claim 24.

26. A computer-readable storage medium comprising instructions, which, when executed on a computer, enable the computer to execute the method according to any one of claims 1 to 15, or enable the computer to execute the method according to any one of claims 16 to 20.

27. A computer program product comprising instructions, which, when executed on a computer, causes the computer to perform the method as claimed in any one of claims 1 to 15, or causes the computer to perform the method as claimed in any one of claims 16 to 20.

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