Reference signal transmission method, and apparatus

Abstract

A reference signal transmission method, and an apparatus. The method comprises: determining cyclic shifts respectively corresponding to N antenna ports, wherein N=16; on the basis of the cyclic shifts respectively corresponding to the N antenna ports, determining reference signal sequences respectively corresponding to the N antenna ports; and, sending corresponding reference signals on time-frequency resources respectively corresponding to the N antenna ports, the reference signal sequence corresponding to the i-th antenna port among the N antenna ports being mapped to the i-th frequency domain resource, the i-th frequency domain resource being determined on the basis of a frequency domain comb corresponding to the i-th antenna port, the N antenna ports corresponding to the same time domain resource, and the total number of antenna ports corresponding to each time domain resource being N. By means of using the method, terminals can send reference signals by means of 16 antenna ports, and can send, on each time domain resource, reference signals respectively corresponding to all of the 16 antenna ports, such that access network devices can quickly acquire the reference signals of all of the 16 antenna ports.

Description

Reference signal transmission method and apparatus

[0001] Cross Reference to Related Applications

[0002] This application claims priority to the Chinese Patent Application No. 202410850403.9, filed on June 27, 2024, and entitled “A Reference Signal Transmission Method and Apparatus”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of communication, and in particular to a reference signal transmission method and apparatus. BACKGROUND

[0004] Urban air mobility (UAM) uses electric vertical take off & landing (eVTOL) unmanned aerial vehicles to realize urban air mobility and provide services in the fields of passenger transportation and logistics transportation. The unmanned aerial vehicles or user equipment (UE) of passengers on the unmanned aerial vehicles in the UAM system communicate with the next generation node B (gNB) on the ground through the fifth generation (5G) new radio (NR).

[0005] Since the unmanned aerial vehicles have larger volume and load than handheld terminals, they can use larger antennas for communication, thereby improving throughput or reliability. Currently, the standard supports terminals to use a maximum of 8 antenna ports for transmission. When the number of transmission antenna ports of the terminal is increased to 16, how to implement signal transmission is a problem worth attention. SUMMARY

[0006] Embodiments of the present application provide a reference signal transmission method and apparatus to quickly transmit reference signals when the number of transmission antenna ports of the terminal is increased to 16.

[0007] In a first aspect, a method for transmitting a reference signal is provided. The method can be performed by a terminal or a chip in the terminal. The method includes determining a cyclic shift corresponding to each of N antenna ports, where N=16; determining a reference signal sequence corresponding to each of the N antenna ports according to the cyclic shift corresponding to each of the N antenna ports; and transmitting a corresponding reference signal on a time-frequency resource corresponding to each of the N antenna ports, where a reference signal sequence corresponding to an i-th antenna port of the N antenna ports is mapped to an i-th frequency domain resource, the i-th frequency domain resource is determined according to a frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take values from 1 to 16 or 0 to 15, and the N antenna ports correspond to the same time domain resource, and a total number of antenna ports corresponding to each time domain resource is N.

[0008] With the above method, the terminal can transmit a reference signal through 16 antenna ports, and can transmit a reference signal corresponding to each of the 16 antenna ports on each time domain resource (e.g., a time domain symbol), so that the access network device can quickly obtain the reference signals of all the 16 antenna ports, and further estimate a channel according to the received reference signals, thereby achieving higher throughput and reliability.

[0009] In a possible design, the method further includes receiving indication information, where the indication information indicates that the reference signal is transmitted using time division multiplexing (TDM), or the indication information indicates that a total number of antenna ports corresponding to each time domain resource is N. p i i is an index of the i-th antenna port, i is an index of the i-th antenna port corresponding to each time domain resource.

[0010] In a possible design, in a case where the indication information is not received, it is determined that the reference signal is transmitted without using TDM.

[0011] In a possible design, the indication information indicates that the reference signal is transmitted without using TDM, or the indication information indicates that the total number of antenna ports corresponding to each time domain resource is N.

[0012] In a possible design, a maximum cyclic shift number is 6, and the cyclic shift corresponding to the i-th antenna port is determined according to the following formula:

[0013] wherein, i is a cyclic shift value, i is the maximum cyclic shift number, i is an index of the i-th antenna port corresponding to each time domain resource, i is a total number of antenna ports corresponding to each time domain resource,

[0014] In a possible design, the maximum cyclic shift number is 12; and the cyclic shift corresponding to the ithantenna port is determined according to the following formula:

[0015] wherein, is a cyclic shift value, is the maximum cyclic shift number, is an index of the ithantenna port corresponding to each time domain resource, is a total number of antenna ports corresponding to each time domain resource,

[0016] In a possible design, the maximum cyclic shift number is 8; and the cyclic shift corresponding to the ithantenna port is determined according to the following formula:

[0017] wherein, is a cyclic shift value, is the maximum cyclic shift number, is an index of the ithantenna port corresponding to each time domain resource, is a total number of antenna ports corresponding to each time domain resource,

[0018] In a possible design, the comb value determines the frequency domain comb corresponding to the ithantenna port according to a comb offset and an index of the ithantenna port.

[0019] In a possible design, the frequency domain comb corresponding to the ithantenna port is determined according to the following formula:

[0020] wherein, is the comb offset, is an index of the ithantenna port corresponding to each time domain resource, and K TC is the comb value.

[0021] In a possible design, the comb value K TC is an even number greater than 8; and the frequency domain comb corresponding to the ithantenna port is determined according to the following formula:

[0022] wherein, is the comb offset, is an index of the ithantenna port corresponding to each time domain resource, and s is an integer greater than or equal to 2.

[0023] With the above design, the value of K TC is added, so that K TC can be larger, and then a larger frequency domain comb value can be used, so that the frequency domain overhead is smaller, and then a higher throughput can be obtained.

[0024] In a possible design, the comb value K TC is 16.

[0025] If the i-th antenna port corresponds to a frequency domain comb determined by the following formula: If the i-th antenna port corresponds to a frequency domain comb determined by the following formula:

[0026]

[0027] wherein, the index of the i-th antenna port corresponding to each time domain resource is n i, is the comb offset, K TC is the comb value. wherein, the maximum cyclic shift number can be equal to 4 or 6.

[0028] With the above design, the value of K TC is added, so that K TC can be larger, and then a larger frequency domain comb value can be used, so that the frequency domain overhead is smaller, and then a higher throughput can be obtained.

[0029] In a second aspect, the present application provides a reference signal transmission method, which can be executed by an access network device or a chip in the access network device. The method comprises: receiving corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively, wherein N=16, the frequency domain resources corresponding to the i-th antenna port in the N antenna ports are determined according to the frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take 1 to 16 or 0 to 15, the time domain resources corresponding to the N antenna ports are the same, and the total number of antenna ports corresponding to each time domain resource is N; and analyzing the reference signal corresponding to the corresponding antenna port according to the cyclic shift corresponding to the N antenna ports respectively.

[0030] With the above method, the access network device can obtain the reference signals corresponding to all 16 antenna ports on each time domain resource (for example, time domain symbol), and further estimate the channel according to the received reference signals, so that a higher throughput and reliability can be obtained.

[0031] With the above method, the access network device can obtain the reference signals corresponding to all 16 antenna ports on each time domain resource (for example, time domain symbol), and further estimate the channel according to the received reference signals, so that a higher throughput and reliability can be obtained.​​

[0032] In one possible design, p i is an index of the i-th antenna port, is an index of the i-th antenna port corresponding to each time-domain resource.

[0033] In one possible design, the maximum cyclic shift number is 6; the cyclic shift corresponding to the i-th antenna port is determined using the following equation:

[0034] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time-domain resource,

[0035] In one possible design, the maximum cyclic shift number is 12; the cyclic shift corresponding to the i-th antenna port is determined using the following equation:

[0036] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time-domain resource,

[0037] In one possible design, the maximum cyclic shift number is 8; the cyclic shift corresponding to the i-th antenna port is determined using the following equation:

[0038] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time-domain resource,

[0039] In one possible design, the frequency domain comb corresponding to the i-th antenna port is determined using the following equation:

[0040] wherein, is the comb offset, TC is the comb value.

[0041] In one possible design, the comb value K TC ​is an even number greater than 8; the frequency domain comb corresponding to the ithantenna port is determined by the following formula:

[0042] wherein, is the comb offset, is the index of the ithantenna port corresponding to each time domain resource, and s is an integer greater than or equal to 2.

[0043] With the above design, the value of K TC is added, so that K TC can be larger, and thus a larger frequency domain comb number can be used, so that the frequency domain overhead is smaller, and thus a higher throughput can be obtained.

[0044] In a possible design, the comb value K TC is 16, and the maximum cyclic shift number is 4 or 6;

[0045] If the frequency domain comb corresponding to the ithantenna port is determined by the following formula:

[0046] If the frequency domain comb corresponding to the ithantenna port is determined by the following formula:

[0047] wherein, is the index of the ithantenna port corresponding to each time domain resource, is the comb offset, K TC is the comb value.

[0048] With the above design, the value of K TC is added, so that K TC can be larger, and thus a larger frequency domain comb number can be used, so that the frequency domain overhead is smaller, and thus a higher throughput can be obtained.

[0049] In a third aspect, the present application provides a reference signal transmission method, which can be executed by a terminal or a chip in the terminal. The method comprises: determining time domain resources corresponding to N antenna ports respectively, wherein N=16, the total number of antenna ports corresponding to each time domain resource is M, M is less than N, and N is an integer multiple of M; determining cyclic shifts corresponding to the N antenna ports respectively; determining reference signal sequences corresponding to the N antenna ports respectively according to the cyclic shifts corresponding to the N antenna ports respectively; and transmitting corresponding reference signals on time-frequency resources corresponding to the N antenna ports respectively, wherein a reference signal sequence corresponding to an i-th antenna port in the M antenna ports corresponding to each time domain resource is mapped to an i-th frequency domain resource, the i-th frequency domain resource is determined according to a frequency domain comb corresponding to the i-th antenna port, i is an integer, and i can take values from 1 to M or i can take values from 0 to M-1.

[0050] By using the above method, the terminal can transmit reference signals through 16 antenna ports, and transmit reference signals corresponding to M antenna ports on each time domain resource (for example, a time domain symbol), for example, 16 antenna ports are mapped to 2 or 4 time domain resources, so that the access network device can quickly obtain reference signals of all 16 antenna ports, and further estimate a channel according to the received reference signals, thereby achieving higher throughput and reliability.

[0051] In a possible design, the indication information indicates that the reference signals are transmitted using TDM, and M is a default value, which is 8 or 4; or the indication information indicates a value of M, and the value of M is 8 or 4.

[0052] By using the above design, the terminal can know that the reference signals are transmitted using TDM, and the value of M.

[0053] In a possible design, M=8.

[0054] wherein p j ∈{1000,1001,…,1015}, p j is an index of the i-th antenna port, j is an integer, and j can take values from 1 to 16 or 0 to 15. is an index of the i-th antenna port corresponding to each time domain resource.

[0055] In a possible design, the comb value K TC is an even number greater than 8; and the frequency domain comb corresponding to the i-th antenna port is determined according to the following formula:

[0056] wherein is a comb offset. u is an integer greater than or equal to 4.

[0057] Exemplarily, the comb value K TC is 16, and the maximum cyclic shift number is 4.

[0058] With the above design, the value of K TC is added, so that K TC can be larger, and a larger frequency domain comb number can be used, so that the frequency domain overhead is smaller, and higher throughput can be obtained.

[0059] In a possible design, M = 4;

[0060] wherein p j ∈ {1000, 1001, …, 1015}, p j is an index of the jth antenna port, j is an integer, and j can take values from 1 to 16 or 0 to 15, is an index of the ith antenna port corresponding to each time domain resource.

[0061] In a possible design, the comb value K TC is an even number greater than 8; and the frequency domain comb corresponding to the ith antenna port is determined by the following formula:

[0062] wherein, is a comb offset, v is an integer greater than or equal to 8.

[0063] Exemplarily, the comb value K TC is 16, and the maximum cyclic shift number is 4.

[0064] With the above design, the value of K TC is added, so that K TC can be larger, and a larger frequency domain comb number can be used, so that the frequency domain overhead is smaller, and higher throughput can be obtained.

[0065] In a fourth aspect, the present application provides a reference signal transmission method, which can be executed by an access network device or a chip in the access network device. The method comprises: receiving corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively, wherein N=16, the total number of antenna ports corresponding to each time domain resource is M, M is less than N, and N is an integer multiple of M; the frequency domain resource corresponding to the i th antenna port in the M antenna ports corresponding to each time domain resource is determined according to the frequency domain comb corresponding to the i th antenna port, i is an integer, and i can take 1 to M or i can take 0 to M-1; and the reference signal corresponding to the corresponding antenna port is analyzed according to the cyclic shift corresponding to the N antenna ports respectively.

[0066] By using the above method, the access network device receives the reference signals corresponding to the M antenna ports respectively on each time domain resource (for example, time domain symbol), so that the access network device can quickly obtain the reference signals of all 16 antenna ports, and further estimate the channel according to the received reference signals, thereby obtaining higher throughput and reliability.

[0067] In a possible design, the indication information indicates that the reference signals are transmitted using TDM, and M is a default value, which is 8 or 4; or the indication information indicates the value of M, and the value of M is 8 or 4.

[0068] In a possible design, M=8.

[0069] wherein p j ∈{1000,1001,…,1015}, p j is an index of the i th antenna port, j is an integer, and j can take 1 to 16 or 0 to 15. is an index of the i th antenna port corresponding to each time domain resource.

[0070] In a possible design, the comb value K TC is an even number greater than 8; and the frequency domain comb corresponding to the i th antenna port is determined according to the following formula:

[0071] wherein, is a comb offset, u is an integer greater than or equal to 4.

[0072] Exemplarily, the comb value K TC is 16, and the maximum cyclic shift number is 4.

[0073] In a possible design, M=4.

[0074] wherein p j ∈ {1000, 1001, …, 1015}, p j is an index of the jth antenna port, j is an integer, j can take values from 1 to 16 or 0 to 15, is an index of the ith antenna port corresponding to each time domain resource.

[0075] In a possible design, the comb value K TC is an even number greater than 8; and the frequency domain comb corresponding to the ith antenna port is determined according to the following formula:

[0076] wherein, is a comb offset, v is an integer greater than or equal to 8.

[0077] Exemplarily, the comb value K TC is 16, and the maximum cyclic shift number is 4.

[0078] In a fifth aspect, a communication apparatus is provided, which includes a processing unit and a transceiver unit, wherein the processing unit is configured to determine cyclic shifts corresponding to N antenna ports respectively, wherein N = 16; and determine reference signal sequences corresponding to the N antenna ports respectively according to the cyclic shifts corresponding to the N antenna ports respectively.

[0079] The transceiver unit is configured to send corresponding reference signals on time-frequency resources corresponding to the N antenna ports respectively, wherein a reference signal sequence corresponding to an ith antenna port in the N antenna ports is mapped to an ith frequency domain resource, the ith frequency domain resource is determined according to a frequency domain comb corresponding to the ith antenna port, i is an integer, i can take values from 1 to 16 or 0 to 15, time domain resources corresponding to the N antenna ports are the same, and a total number of antenna ports corresponding to each time domain resource is N.

[0080] In a possible design, the transceiver unit is configured to determine, in a case where no indication information is received, that time division multiplexing (TDM) is not used for transmission of the reference signals, wherein the indication information indicates that the TDM is used for transmission of the reference signals.

[0081] In a possible design, p i is an index of the ith antenna port, is an index of the ith antenna port corresponding to each time domain resource.

[0082] In a possible design, the maximum cyclic shift number is 6; and the cyclic shift corresponding to the ith antenna port is determined according to the following formula:

[0083] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0084] In a possible design, the maximum cyclic shift number is 12; the cyclic shift corresponding to the i-th antenna port is determined by using the following equation:

[0085] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0086] In a possible design, the maximum cyclic shift number is 8; the cyclic shift corresponding to the i-th antenna port is determined by using the following equation:

[0087] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0088] In a possible design, the frequency domain comb corresponding to the i-th antenna port is determined by using the following equation:

[0089] wherein, is the comb offset, K TC is the comb value.

[0090] In a possible design, the comb value K TC is an even number greater than 8; the frequency domain comb corresponding to the i-th antenna port is determined by using the following equation:

[0091]

[0092] wherein, is the comb offset, is the index of the i-th antenna port corresponding to each time domain resource, and s is an integer greater than or equal to 2.

[0093] In a possible design, the comb value K TC is 16, and the maximum cyclic shift number is 4 or 6.

[0094] If the frequency domain comb corresponding to the i th antenna port is determined according to the following formula:

[0095] If the frequency domain comb corresponding to the i th antenna port is determined according to the following formula:

[0096] wherein, is an index of the i th antenna port corresponding to each time domain resource, is the comb offset, K TC is the comb value.

[0097] In a sixth aspect, the present application provides a communication device, which includes a processing unit and a transceiver unit, wherein the transceiver unit is configured to receive corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively, wherein N=16, and a frequency domain resource corresponding to an i th antenna port in the N antenna ports is determined according to a frequency domain comb corresponding to the i th antenna port, i is an integer, i can take values from 1 to 16 or 0 to 15, the N antenna ports correspond to the same time domain resource, and a total number of antenna ports corresponding to each time domain resource is N.

[0098] The processing unit is configured to analyze the reference signals corresponding to the corresponding antenna ports according to the cyclic shifts of the N antenna ports respectively.

[0099] In a possible design, p i is an index of the i th antenna port, is an index of the i th antenna port corresponding to each time domain resource.

[0100] In a possible design, the maximum cyclic shift number is 6, and a cyclic shift corresponding to the i th antenna port is determined according to the following formula:

[0101] wherein, is a cyclic shift value, is the maximum cyclic shift number, is a total number of antenna ports corresponding to each time domain resource,

[0102] In one possible design, the maximum cyclic shift number is 12; the cyclic shift corresponding to the ithantenna port is determined using the following equation:

[0103] wherein, is the cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time-domain resource,

[0104] In one possible design, the maximum cyclic shift number is 8; the cyclic shift corresponding to the ithantenna port is determined using the following equation:

[0105] wherein, is the cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time-domain resource,

[0106] In one possible design, the frequency-domain comb corresponding to the ithantenna port is determined using the following equation:

[0107] wherein, is the comb offset, K TC is the comb value.

[0108] In one possible design, the comb value K TC is an even number larger than 8; the frequency-domain comb corresponding to the ithantenna port is determined using the following equation:

[0109] wherein, is the comb offset, is the index of the ithantenna port corresponding to each time-domain resource, and s is an integer larger than or equal to 2.

[0110] In one possible design, the comb value K TC is 16, and the maximum cyclic shift number is 4 or 6;

[0111] If the frequency-domain comb corresponding to the ithantenna port is determined using the following equation:

[0112] If the frequency-domain comb corresponding to the ithantenna port is determined using the following equation:

[0113] wherein, is an index of the i th antenna port corresponding to each time domain resource, is the comb offset, K TC is the comb value.

[0114] In a seventh aspect, the present application provides a communication device, comprising a processing unit and a transceiver unit, wherein the processing unit is configured to determine time domain resources corresponding to N antenna ports respectively, wherein N = 16, the total number of antenna ports corresponding to each time domain resource is M, M is less than N, and N is an integer multiple of M; determine cyclic shifts corresponding to the N antenna ports respectively; determine reference signal sequences corresponding to the N antenna ports respectively according to the cyclic shifts corresponding to the N antenna ports respectively; and the transceiver unit is configured to transmit corresponding reference signals on time-frequency resources corresponding to the N antenna ports respectively, wherein the reference signal sequence corresponding to the i th antenna port in the M antenna ports corresponding to each time domain resource is mapped to the i th frequency domain resource, the i th frequency domain resource is determined according to the frequency domain comb corresponding to the i th antenna port, i is an integer, and i can take values from 1 to M or i can take values from 0 to M-1.

[0115] In a possible design, the transceiver unit is configured to receive indication information, the indication information indicates that the transmission of the reference signal uses TDM, and M is a default value, the default value being 8 or 4; or the indication information indicates the value of M, and the value of M is 8 or 4.

[0116] In a possible design, M = 8.

[0117] wherein p j ∈ {1000, 1001, …, 1015}, p j is an index of the i th antenna port, j is an integer, and j can take values from 1 to 16 or 0 to 15, is an index of the i th antenna port corresponding to each time domain resource.

[0118] In a possible design, the comb value K TC is an even number greater than 8; and the frequency domain comb corresponding to the i th antenna port is determined according to the following formula:

[0119] wherein, is a comb offset, u is an integer greater than or equal to 4.

[0120] In a possible design, M=4;

[0121] wherein p j ∈{1000,1001,…,1015}, p j is an index of the jthantenna port, j is an integer, j can take values from 1 to 16 or 0 to 15, is an index of the ithantenna port corresponding to each time-domain resource.

[0122] In a possible design, the comb value K TC is an even integer greater than 8; and the frequency-domain comb corresponding to the ithantenna port is determined according to the following formula:

[0123] wherein, is a comb offset, v is an integer greater than or equal to 8.

[0124] In an eighth aspect, the present application provides a communication apparatus, which comprises a processing unit and a transceiver unit, wherein the transceiver unit is configured to receive corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively, wherein N=16, the total number of antenna ports corresponding to each time-domain resource is M, M is less than N, and N is an integer multiple of M; the frequency-domain resource corresponding to the ithantenna port in the M antenna ports corresponding to each time-domain resource is determined according to a frequency-domain comb corresponding to the ithantenna port, i is an integer, i can take values from 1 to M or i can take values from 0 to M-1; and the processing unit is configured to analyze the reference signal corresponding to the corresponding antenna port according to the cyclic shift corresponding to the N antenna ports respectively.

[0125] In a possible design, the transceiver unit is configured to send indication information, the indication information indicates that the reference signal is transmitted using TDM, and M is a default value, the default value being 8 or 4; or the indication information indicates the value of M, and the value of M is 8 or 4.

[0126] In a possible design, M=8;

[0127] wherein p j ∈{1000,1001,…,1015}, p j is an index of the jthantenna port, j is an integer, j can take values from 1 to 16 or 0 to 15, is an index of the ithantenna port corresponding to each time-domain resource.

[0128] In a possible design, the comb value K TCis an even integer greater than 8; and the frequency domain comb corresponding to the ithantenna port is determined by the following formula:

[0129] wherein, is a comb offset, u is an integer greater than or equal to 4.

[0130] In a possible design, M = 4.

[0131] wherein, p j ∈ {1000, 1001, …, 1015}, p j is an index of the jthantenna port, j is an integer, and j can take values from 1 to 16 or 0 to 15, is an index of the ithantenna port corresponding to each time domain resource.

[0132] In a possible design, the comb value K TC is an even integer greater than 8; and the frequency domain comb corresponding to the ithantenna port is determined by the following formula:

[0133] wherein, is a comb offset, v is an integer greater than or equal to 8.

[0134] In a ninth aspect, the present application provides a communication apparatus, which can be the first apparatus, or a module or unit (for example, a chip, or a chip system, or a circuit) corresponding to the method / operation / step / action described in any of the first aspect or the third aspect, or can be used in matching with the first apparatus.

[0135] In a tenth aspect, the present application provides a communication apparatus, which can be the second apparatus, or a module or unit (for example, a chip, or a chip system, or a circuit) corresponding to the method / operation / step / action described in any of the second aspect or the fourth aspect, or can be used in matching with the second apparatus.

[0136] In an eleventh aspect, the present application provides a communication device, including at least one processing element, and at least one storage element for storing programs and data, wherein the at least one processing element is configured to read and execute the programs and data stored in the storage element, so that the method described in any of the aspects of the present application is implemented.

[0137] In a possible design, the communication device further includes the at least one storage element.

[0138] In a twelfth aspect, the present application provides a computer program, which, when executed on a computer, causes the computer to perform the method of any one of the preceding aspects.

[0139] In a thirteenth aspect, the present application provides a communication apparatus, comprising: an interface circuit and at least one processor; the interface circuit is configured to provide input and / or output of a program or instructions for the at least one processor; the at least one processor is configured to execute the program or instructions to enable the communication apparatus to perform the method of any one of the preceding aspects.

[0140] In a possible implementation, the communication apparatus comprises the at least one memory, and the at least one memory is configured to store the program or instructions.

[0141] In a fourteenth aspect, the present application provides a computer storage medium, which stores a software program, and the software program, when read and executed by one or more processors, enables the method of any one of the preceding aspects to be performed.

[0142] In a fifteenth aspect, the present application provides a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of the preceding aspects.

[0143] In a sixteenth aspect, the present application provides a chip system, comprising at least one chip and a memory, and the at least one chip is configured to read and execute a program stored in the memory to implement the method of any one of the preceding aspects.

[0144] On the basis of the implementation provided in the preceding aspects, the present application can be further combined to provide more implementations. BRIEF DESCRIPTION OF DRAWINGS

[0145] FIG. 1 shows a schematic diagram of an architecture of a possible communication system;

[0146] FIG. 2 shows a schematic diagram of a possible baseband hardware implementation;

[0147] FIG. 3 shows a schematic diagram of a possible antenna switching;

[0148] FIG. 4 shows a schematic diagram of a reference signal transmission method in the present application;

[0149] FIG. 5 shows a schematic diagram of another reference signal transmission method in the present application;

[0150] FIG. 6 shows a schematic diagram of a structure of a communication apparatus in the present application;

[0151] FIG. 7 shows a schematic diagram of another communication apparatus in the present application. Detailed Implementation

[0152] The specific implementations of this application are described below with reference to the accompanying drawings in the embodiments. However, the implementations of this application may also include combining these embodiments without departing from the spirit or scope of this application, such as using other embodiments and making structural changes. Therefore, the detailed description of the following embodiments should not be understood in a limiting sense. The terminology used in the embodiment section of this application is only used to explain the specific embodiments of this application and is not intended to limit this application.

[0153] The embodiments of this application can be applied to various communication systems, such as: long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, worldwide interoperability for microwave access (WIMAX) communication systems, 5G systems or new radio (NR) systems, or to future communication systems or other similar communication systems, or ultra-wideband (UWB) systems, or wireless fidelity (WiFi) systems.

[0154] Figure 1 illustrates a possible, non-limiting system diagram. As shown in Figure 1, the communication system 1000 includes a wireless access network 100 and a core network 200. Optionally, the communication system 1000 may also include an Internet 300. The wireless access network 100 may include at least one wireless access network device (110a and 110b in Figure 1) and at least one terminal (120a-120j in Figure 1). The terminal connects wirelessly to the wireless access network device, and the wireless access network device connects wirelessly or via a wired connection to the core network. The core network device and the wireless access network device can be independent physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated into the same physical device, or a single physical device can integrate some of the functions of the core network device and some of the functions of the wireless access network device. Terminals can be interconnected with each other, and wireless access network devices can be interconnected via wired or wireless connections. Figure 1 is only a schematic diagram; the communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1.

[0155] The radio access network device can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc. The radio access network device can also be an open RAN (O-RAN or ORAN), or a cloud radio access network (CRAN). The radio access network device can also be a communication system that combines two or more of the above systems. The radio access network device can be a macro base station (such as 110a in FIG. 1), or a micro base station or indoor station (such as 110b in FIG. 1), or a relay node or donor node, etc.

[0156] In addition, the radio access network device can also be a module or unit that completes part of the functions of the base station, for example, a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in this application. Any one of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0157] Embodiments of the present application do not limit the specific technology and specific device form adopted by the radio access network device. For the convenience of description, the radio access network device will be referred to as the access network device hereinafter.

[0158] The terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely applied to various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, unmanned aerial vehicle, helicopter, airplane, ship, robot, mechanical arm, smart home device, etc.

[0159] Embodiments of the present application do not limit specific technologies and specific device forms adopted by the terminal.

[0160] The access network device and the terminal can be fixed in position or movable. The access network device and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can be deployed on water surface; can also be deployed on airplanes, balloons and artificial satellites. Embodiments of the present application do not limit the application scenarios of the access network device and the terminal.

[0161] The roles of the access network device and the terminal can be relative, for example, the helicopter or unmanned aerial vehicle 120i in FIG. 1 can be configured as a mobile access network device, and for those terminals 120j accessing the wireless access network 100 through 120i, the unmanned aerial vehicle 120i is an access network device; but for the access network device 110a, 120i is a terminal, that is, 110a and 120i communicate through a wireless air interface protocol. Of course, 110a and 120i can also communicate through an interface protocol between access network devices and access network devices, at this time, relative to 110a, 120i is also an access network device. 110a and 110b in FIG. 1 can be referred to as communication apparatuses with access network device function, and 120a-120j in FIG. 1 can be referred to as communication apparatuses with terminal function.

[0162] The access network device and the terminal, the access network device and the access network device, and the terminal and the terminal can communicate through a licensed spectrum, or through an unlicensed spectrum, or through both the licensed spectrum and the unlicensed spectrum; can communicate through a spectrum below 6 gigahertz (GHz), or through a spectrum above 6 GHz, or through both the spectrum below 6 GHz and the spectrum above 6 GHz. Embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0163] As shown in FIG. 2, it is a schematic diagram of a possible baseband hardware implementation in a terminal or an access network device, wherein the baseband can be implemented by a processing system including one or more processors. The processor includes a microprocessor (such as X86, ARM), a microcontroller, a digital signal processor (DSP), a field programmable gate array (FPGA), a GPU, a programmable logic device (PLD), a state machine, a gate logic, a discrete hardware circuit, and other suitable hardware configured to perform various functions. That is, the processor used in the baseband can be used to implement the processes described below and any one or more steps in the processes.

[0164] The processing system can be implemented with a bus architecture, generally represented by the bus. The bus can include any number of interconnecting buses and bridges, depending on the specific application of the processing system and the overall design constraints. The bus can couple various circuits including one or more processors (generally represented by the processor), memory, and computer readable medium. The bus can also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, and so on, thus, will not be further described. The bus interface provides an interface between the bus and a transceiver, and between the bus and an interface.

[0165] The transceiver provides a communication interface or means for communicating with various other apparatuses through a wireless transmission medium. The transceiver can be coupled to an antenna array, and the transceiver and the antenna array can be used together to communicate with a corresponding network type. At least one interface (such as a network interface and / or a user interface) provides a communication interface or means for communicating through an internal bus or via an external transmission medium.

[0166] The processor is responsible for managing the bus and general processing, including the execution of software stored on the computer-readable medium. The software, when executed by the processor, causes the processing system to perform the various functions described below for any particular apparatus. The functions of the processor and the memory and the computer-readable medium can be implemented as: encoding, decoding, rate matching, de-rate matching, scrambling, de-scrambling, modulating, demodulating, layer mapping, fast Fourier transform (FFT), inverse fast Fourier transform (IFFT), inverse discrete fourier transform (IDFT), precoding, resource element (RE) mapping, channel equalization, de-RE mapping, digital beam forming (BF), adding a cyclic prefix (CP), removing a CP, and so on.

[0167] Currently, the standard supports a terminal to transmit with a maximum of 8 antenna ports, exemplarily, the following takes a terminal to transmit sounding reference signal (SRS) with 8 antenna ports as an example for illustration:

[0168] The calculation formula of the frequency domain comb is formula 1, specifically:

[0169] The calculation formula of the cyclic shift is formula 2, specifically:

[0170] In the above formula 1 and formula 2, K TC is a comb value, indicated by the high-level parameter "transmissionComb", K TC ∈{2,4,8}. is a comb offset, included in the high-level parameter "transmissionComb", is the index of the i-th antenna port corresponding to each time domain symbol. is the total number of antenna ports corresponding to each time domain symbol. is the maximum cyclic shift number, which is one-to-one corresponding to the comb value K TC , as shown in the following table 1. is a cyclic shift value, included in the high-level parameter "transmissionComb",

[0171] Table 1: correspondence between maximum cyclic shift number and comb number

[0172] For example, when K TC = 2, According to the above formula 1 and formula 2, the SRS resource mapping relationship can be obtained, that is, the frequency domain comb and the cyclic shift used by each antenna port, as shown in Table 2. Since K TC = 2, there are 2 optional frequency domain combs, denoted as Comb0 and Comb1. Since there are 8 optional cyclic shifts, denoted as CS0-CS7. P0-P7 represent 8 antenna ports, for example, P0 uses Comb0 and CS4, or P0 corresponds to Comb0 and P0 corresponds to CS4.

[0173] Table 2: SRS resource mapping relationship of 8 antenna ports

[0174] It can be understood that the above Table 2 is only an example, and the spaces in Table 2 can be understood as combinations of frequency domain combs and cyclic shifts not used by the current 8 antenna ports (or the current terminal), or combinations of frequency domain combs and cyclic shifts that can be used by other terminals. The meaning of the spaces in the following tables is similar and will not be repeated.

[0175] However, when K , the above two formulas can only use the otherwise branch.

[0176] In combination with the above formula 1, the frequency domain comb that is, the same frequency domain comb is used for each antenna port.

[0177] In combination with the above formula 2, the possible values of K the value of K is {0, 1, …, 15}, but no matter which one of the values of K is {8, 12, 6}, there will always be making a decimal number, not an integer, that is, formula 2 cannot take effect, and it is impossible to determine the corresponding cyclic shift of each antenna port, that is, it cannot be completely orthogonally mapped to 16 antenna ports, which will cause interference between different antenna ports.

[0178] ​​In addition, a radio resource control (RRC) high-layer parameter SRS resource set (SRS-ResourceSet) is configured as "antenna switching (antennaSwitching)", and a 2T16R, 4T16R, 8T16R, or the like transmission port switching (TxPortSwitch) is used. The SRS resource (SRS resource) can be multiple, and each SRS resource corresponds to part of the SRS antenna port. For example, SRS antenna ports 1-7 and SRS antenna ports 8-15 correspond to different SRS resources, respectively. Although each SRS resource only corresponds to part of the SRS antenna port, after transmitting the SRS on multiple SRS resources, 16 SRS antenna ports have all completed the transmission of SRS, that is, the channels corresponding to all 16 SRS antenna ports can be estimated.

[0179] For example, FIG. 3 is a schematic diagram of a possible antenna switching. Among them, the D frame is used to transmit the downlink signal, the U frame is used to transmit the uplink signal, and the S frame is a special frame, which also includes an uplink symbol. Assuming that the transmission period of the SRS is 5 slots, the SRS is transmitted on the S frame, and 4 antenna ports are used each time, then 4 S frames complete the transmission of all 16 SRS ports.

[0180] Even if the 8T16R TxPortSwitch mode is used, it is 8 transmitting and 16 receiving, the SRS transmission antenna port is 8, and each SRS resource corresponds to 8 SRS transmission ports. Therefore, 2 frames are needed to complete the transmission of all 16 ports, which may cause a large transmission delay. For a fast-moving (for example, greater than 160 km / h) air UE (for example, UAM) communication scenario with fast channel time-domain changes, transmitting SRS by the above method may cause a large error in channel estimation, which will affect the reliability and throughput of the air UAM.

[0181] Based on this, in order to achieve rapid transmission of reference signals when the number of transmitting antenna ports of the terminal is increased to 16, and to effectively ensure high throughput and reliability, the embodiments of this application provide a reference signal transmission method as shown in Figures 4 and 5. It is understood that the following embodiments are described with access network devices and terminals as the execution subjects. The access network device can be referred to as a communication device. For example, an access network device can be understood as a device with access network device functions. For example, a device with access network device functions can be an access network device; or some components in the access network device, such as CU, DU, etc. It can also be a device that supports the access network device in realizing this function, such as a chip system, hardware circuit, software module, or hardware circuit plus software module. This device can be installed in the access network device or can be used in conjunction with the access network device. In the embodiments of this application, the chip system can be composed of chips, or it can include chips and other discrete devices. The terminal can be referred to as a communication device. For example, a terminal can be understood as a device with terminal functions. For example, a device with terminal functionality can be a terminal; or it can be a device that supports the terminal in implementing this functionality, such as a chip system, hardware circuit, software module, or hardware circuit plus software module. This device can be installed in the terminal or can be used in conjunction with the terminal.

[0182] It is understood that the reference signal in this application may be SRS, or other uplink reference signals, or uplink signals, and this application does not limit this.

[0183] As shown in Figure 4, this application provides a reference signal transmission method. The method includes:

[0184] Step 400: The terminal determines the cyclic shift corresponding to each of the N antenna ports, where N = 16.

[0185] Among them, cyclic shift can also be called code field cyclic shift.

[0186] For example, the terminal can know the maximum cyclic shift number. With the number of comb teeth K TC The corresponding relationships are shown in Table 1 or Table 3, for example. Among them, the comb tooth value K... TC This can be indicated by the higher-level parameter "transmissionComb", and the terminal can then determine the comb tooth value K indicated by the higher-level parameter. TC and the maximum cyclic shift. With the number of comb teeth K TC The correspondence is determined with the comb tooth value K. TC The corresponding maximum cyclic shift number In addition, the comb tooth value K TC Other parameters may also be used to indicate this, but this application does not limit this.

[0187] Exemplarily, if the number of combs K TC is 8, the maximum cyclic shift number is 6. If the number of combs K TC is 4, the maximum cyclic shift number is 12. If the number of combs K TC is 2, the maximum cyclic shift number is 8.

[0188] When the maximum cyclic shift number is 6, is the total number of antenna ports corresponding to each time domain resource, the cyclic shift corresponding to the i-th antenna port satisfies the following relationship, which can be specifically expressed as the following formula a:

[0189] When the maximum cyclic shift number is 12, is the total number of antenna ports corresponding to each time domain resource, the cyclic shift corresponding to the i-th antenna port satisfies the following relationship, which can be specifically expressed as the following formula b:

[0190] When the maximum cyclic shift number is 8, is the total number of antenna ports corresponding to each time domain resource, the cyclic shift corresponding to the i-th antenna port satisfies the following relationship, which can be specifically expressed as the following formula c:

[0191] In the above formulas a-c, is the cyclic shift value, Exemplarily, may also be indicated by a high-layer parameter “transmissionComb”, in addition, may also be indicated by other parameters, which are not limited in the present application.

[0192] In the above formulas a-c, is the index of the i-th antenna port corresponding to each time domain resource, i is an integer, i can take 1 to 16 or i can take 0 to 15. is the total number of antenna ports corresponding to each time domain resource, It should be noted that in the embodiment shown in FIG. 4, the case of is taken as an example, in addition, may also be replaced by

[0193] Further, in combination with the above formulas a-c, formula 2 can be updated as formula 2-1:

[0194] In step 410, the terminal determines the reference signal sequence corresponding to each of the N antenna ports according to the cyclic shift corresponding to each of the N antenna ports.

[0195] For example, if the reference signal is SRS, the terminal can generate the SRS sequence according to the following formula:

[0196] wherein, is the length or the number of bits of the SRS sequence, n is the index of the sequence bit, is the number of orthogonal frequency division multiplexing (OFDM) symbols within the SRS resource, is the OFDM symbol index within the SRS resource, is the cyclic shift corresponding to the antenna port p i SRS sequence transmitted on bit n and OFDM symbol l'. is a low peak to average power ratio (PAPR) sequence of type 1, wherein a is the cyclic shift, δ = log2(K TC ), K TC may be indicated by a high-layer parameter "transmissionComb", u ∈ {0, 1,..., 29} is the group number, v is the base sequence number within the group, is used to represent whether the antenna port p i corresponding to the cyclic shift a i transmits the SRS sequence on symbol l'.

[0197] is the cyclic shift corresponding to the antenna port p i corresponding to the cyclic shift a i is: wherein K is related to a high-layer parameter "hoppingFinerGranularity", is related to a high-layer parameter "cyclicShiftHopping"

[0198] In one possible implementation, in the case where the indication information is not received, the terminal can determine that the transmission reference signal does not use time division multiplexing (TDM). Or in the case where the indication information is not received, the terminal can determine that the total number of antenna ports corresponding to each time domain resource is N, i.e., the total number of antenna ports corresponding to each time domain resource is 16.

[0199] For example, the indication information is used to indicate that the total number of antenna ports corresponding to each time domain resource is M, N is an integer multiple of M, M is less than N, for example, M = 8 or 4, for example, the indication information indicates ports8tdm or ports4tdm. Alternatively, the indication information is used to indicate that the transmission reference signal uses TDM, wherein the total number of antenna ports corresponding to each time domain resource is M, M is a default value, N is an integer multiple of M, and M is less than N. For example, the default value can be 8 or 4. For example, if the default value is 8, the terminal receives the indication information and determines that M = 8. Or, if the default value is 4, the terminal receives the indication information and determines that M = 4.

[0200] It can be understood that the total number of antenna ports corresponding to each time domain resource is N, that is, the total number of antenna ports corresponding to each time domain resource is 16, so that the reference signal can be sent through 16 antenna ports on one time domain resource (for example, one OFDM symbol), and it is not necessary to complete the sending of the reference signal through 16 antenna ports through multiple time domain resources.

[0201] Alternatively, it can be understood that when N = 16 (that is, when the total number of antenna ports or the total number of antenna ports used for sending the reference signal is 16), if the reference signal can be sent through 16 antenna ports on each time domain resource, the terminal does not need to use the TDM mode to transmit the reference signal. When N = 16 (that is, when the total number of antenna ports or the total number of antenna ports used for sending the reference signal is 16), if the reference signal can only be sent through M antenna ports on each time domain resource, N is an integer multiple of M, M is less than N, for example, M = 8 or 4, at least two time domain resources are needed to complete the sending of the reference signal through 16 antenna ports, that is, the terminal needs to use the TDM mode to send the reference signal.

[0202] In summary, in the embodiment shown in FIG. 4, since the terminal does not use TDM when transmitting the reference signal, the total number of antenna ports corresponding to each time domain resource is equal to the total number of antenna ports used for sending the reference signal, the index of the i-th antenna port corresponding to each time domain resource is the index of the i-th antenna port used for sending the reference signal, and therefore, is the total number of antenna ports used for sending the reference signal, which is referred to as the total number of antenna ports, p i is the index of the i-th antenna port used for sending the reference signal, which is referred to as the index of the i-th antenna port,

[0203] For example, in the case where the indication information is not received, the terminal can also determine

[0204] In another possible implementation, the terminal receives indication information from the access network device, the indication information indicating that the transmission reference signal does not use TDM, and the terminal determines that the transmission reference signal does not use TDM. Alternatively, the terminal receives indication information from the access network device, the indication information indicating that the total number of antenna ports corresponding to each time domain resource is N, that is, the indication information indicates that the total number of antenna ports corresponding to each time domain resource is 16, and the terminal determines that the transmission reference signal does not use TDM.

[0205] For example, in the case where the indication information indicates that the transmission reference signal does not use TDM, or the indication information indicates that the total number of antenna ports corresponding to each time domain resource is 16, the terminal determines that

[0206] In step 420, the terminal transmits corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively. Correspondingly, the access network device receives corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively.

[0207] In the above formula, N antenna ports correspond to the same time domain resource, and the total number of antenna ports corresponding to each time domain resource is N. For example, the total number of antenna ports corresponding to each time domain resource is N, which can also be replaced by the total number of antenna ports corresponding to each time domain symbol being 16. That is, on one time domain symbol, the terminal can transmit reference signals through 16 antenna ports, and the access network device can quickly obtain reference signals from 16 antenna ports and further perform channel estimation, thereby ensuring high throughput and reliability.

[0208] In the above formula, the reference signal sequence corresponding to the i-th antenna port in the N antenna ports is mapped to the i-th frequency domain resource, the i-th frequency domain resource is determined according to the frequency domain comb corresponding to the i-th antenna port, i is an integer, and i can take 1 to 16 or 0 to 15. It can be understood that the frequency domain resource corresponding to the i-th antenna port in the N antenna ports is determined according to the frequency domain comb corresponding to the i-th antenna port.

[0209] The following describes how to determine the frequency domain comb corresponding to the i-th antenna port through three possible implementations. In the following formula, is a comb offset, For example, It can also be indicated by a higher layer parameter "transmissionComb", in addition, It can also be indicated by other parameters, which are not limited by the present application.

[0210] Possible implementation 1: The frequency domain comb corresponding to the i-th antenna port satisfies the following relationship, which can be expressed as the following formula d:

[0211] At this time, the above formula 1 can be updated to formula 1-1:

[0212] Possible implementation manner 2: comb value K TC is an even number greater than 8;

[0213] The frequency domain comb corresponding to the i th antenna port satisfies the following relationship, which can be specifically expressed as the following formula e:

[0214] Wherein, s is an integer greater than or equal to 2, and the value of s is exemplarily related to the comb value K TC , or the value of s is related to the comb value K TC and the maximum cyclic shift number . For example, the larger the comb value K TC , the larger the value of s.

[0215] It should be noted that the above possible implementation manner 2 can be applied to the scene that the comb value K TC is an even number greater than 8 or the comb value K TC is an integer greater than 8 and is an integer multiple of 4, that is, table 1 can be updated to table 3. Wherein, X is a newly added exemplary comb value K TC . X can be an even number greater than 8, for example, X can be 10, 12, 16, etc. Or, X can be an integer greater than 8 and is an integer multiple of 4. For example, X can be 12, 16, etc. Wherein, the larger the value of X, the larger the value of s. In addition, X can also be an integer greater than 8 and is an integer multiple of 8, for example, X can be 16, 32, etc. Correspondingly, Y is a newly added maximum cyclic shift number corresponding to X. Exemplarily, Y can be an integer less than or equal to 6, for example, the value of Y can be 6, 4, 2. As a possible example, X = 16, Y = 4. With the above design, for terminals in the air, generally in the environment without shielding and communicating with other devices, and then the frequency domain is also relatively flat, which can support a larger value of X.

[0216] Table 3: correspondence between maximum cyclic shift number and comb number

[0217] When K TC is an even number greater than 8 or K TC is an integer greater than 8 and is an integer multiple of 4, the corresponding can be predefined by the protocol, and at the same time, when calculating the cyclic shift corresponding to the N antenna ports respectively, the above formula a can be used.

[0218] At this time, the above formula 2 can be updated to formula 2-2:

[0219] For example, when the comb tooth value K TC The maximum cyclic shift value is 16. When the value is 4 or 6, the above formula e can be updated to:

[0220] At this point, s = 2.

[0221] At this point, Formula 1 above can be updated to Formula 1-2:

[0222] Possible implementation method 3: Comb tooth value K TC The maximum cyclic shift is 16, and the maximum number of cyclic shifts is 4 or 6.

[0223] like The frequency domain comb corresponding to the i-th antenna port satisfies the following relationship, which can be specifically expressed as the following formula f1:

[0224] like The frequency domain comb corresponding to the i-th antenna port satisfies the following relationship, which can be specifically expressed as the following formula f2:

[0225] It should be noted that the above-mentioned possible implementation method 3 is applicable to the same scenario as possible implementation method 2, and can be applied to comb tooth values ​​K. TC For an even number greater than 8 or a comb tooth value K TC The scenarios involving integers greater than 8 and multiples of 4, as shown in Table 3. Specifically, formula f1 above applies to... For scenarios where the number is odd, the above formula f2 specifically applies to... Scenes where the number is even.

[0226] At this point, Formula 1 above can be updated to Formula 1-3:

[0227] Optional, when That is, the above possible implementation method 3 will only take effect if the cyclic shift of the high-level configuration is greater than or equal to half of the maximum cyclic shift.

[0228] For example, by combining the above formulas, the terminal can determine the mapping relationship between N antenna ports and the corresponding frequency domain comb and cyclic shift, and further, according to the mapping relationship, the terminal sends the corresponding reference signals on the time and frequency resources corresponding to the N antenna ports respectively.

[0229] The following examples illustrate this:

[0230] Example 1: For K TC =2, Combining the above formula c and formula d, the following table 4 can be obtained, that is, the mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts is obtained.

[0231] Table 4: Mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts

[0232] Example 2: for K TC = 4, Combining the above formula b and formula d, the following table 5 can be obtained, that is, the mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts is obtained.

[0233] Table 5: Mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts

[0234] Example 3: for K TC = 8 Combining the above formula a and formula d, the following table 6 can be obtained, that is, the mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts is obtained.

[0235] Table 6: Mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts

[0236] Example 4, for K TC = 16, Combining the above formula a and formula e, the following table 7 can be obtained, that is, the mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts is obtained.

[0237] Table 7: Mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts

[0238] Example 5, for K TC = 16, Combining the above formula a and formula f1 and f2, the following table 8 can be obtained, that is, the mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts is obtained.

[0239] Table 8: Mapping relationship between 16 antenna ports and corresponding frequency domain combs and cyclic shifts

[0240] Step 430, the access network device parses the reference signal corresponding to the corresponding antenna port according to the cyclic shift corresponding to the N antenna ports respectively.

[0241] Exemplarily, the access network device can first determine the cyclic shifts corresponding to the N antenna ports respectively, and further resolve the reference signals corresponding to the respective antenna ports according to the obtained cyclic shifts corresponding to the N antenna ports respectively. The access network device determining the cyclic shifts corresponding to the N antenna ports respectively can refer to step 410 described above, and details are not described herein again.

[0242] With the embodiment shown in FIG. 4 described above, the terminal can send the reference signals through 16 antenna ports, and can send the reference signals corresponding to all the 16 antenna ports on 1 time domain symbol, so that the access network device can quickly obtain the reference signals of all the 16 antenna ports, and further estimate the channel to obtain higher throughput and reliability. In addition, the newly added K TC has a value, so that K TC may be larger, and a larger frequency domain comb number can be used, so that the frequency domain overhead is smaller, and higher throughput can be obtained.

[0243] As shown in FIG. 5, the present application provides another reference signal transmission method. The method comprises:

[0244] Step 500: The terminal determines time domain resources corresponding to N antenna ports respectively, wherein N=16, the total number of antenna ports corresponding to each time domain resource is M, M is less than N, and N is an integer multiple of M.

[0245] In a possible implementation, the terminal can receive indication information, the indication information indicating that TDM is used for transmitting the reference signals. In addition, the value of M can be agreed or configured in advance, and when the terminal receives the indication information, the terminal determines the value of M as a default value. Exemplarily, the default value can be 8 or 4. For example, if the default value is 8, the terminal receives the indication information and determines M=8. Or, if the default value is 4, the terminal receives the indication information and determines M=4.

[0246] Therefore, the access network device can indicate the terminal whether to use TDM for transmitting the reference signals, and if no information for indicating that TDM is used for transmitting the reference signals is sent, the terminal can use the method provided by the embodiment shown in FIG. 4 described above to transmit the reference signals, that is, M=N. If the access network device indicates the terminal to use TDM for transmitting the reference signals, M can adopt the default value.

[0247] In another possible implementation, the terminal can receive indication information, the indication information indicating the value of M, or the indication information indicating that the total number of antenna ports corresponding to each time domain resource is M. Exemplarily, the value of M is 8 or 4.

[0248] It can be understood that in the embodiment shown in FIG. 5, the total number of antenna ports corresponding to each time domain resource is M, that is, the total number of antenna ports corresponding to each time domain resource is not 16, but less than 16, and therefore, the reference signal cannot be sent through 16 antenna ports on one time domain resource (for example, one OFDM symbol), but at least two time domain resources are needed to complete the sending of the reference signal through 16 antenna ports.

[0249] Alternatively, it can be understood that when N = 16 (that is, when the total number of antenna ports or the total number of antenna ports used to send the reference signal is 16), if only M antenna ports can be used to send the reference signal on each time domain resource, N is an integer multiple of M, M is less than N, for example, M = 8 or 4, then at least two time domain resources are needed to complete the sending of the reference signal through 16 antenna ports, that is, the terminal needs to use the TDM mode to send the reference signal at this time.

[0250] In summary, in the embodiment shown in FIG. 5, since the terminal uses TDM when transmitting the reference signal, the total number of antenna ports corresponding to each time domain resource is not equal to the total number of antenna ports used to send the reference signal, and the index of the i-th antenna port corresponding to each time domain resource is not equal to the index of the i-th antenna port used to send the reference signal, therefore, is the total number of antenna ports corresponding to each time domain resource, is the total number of antenna ports used to send the reference signal, which is referred to as the total number of antenna ports, p j is the index of the j-th antenna port used to send the reference signal, which is referred to as the index of the j-th antenna port, is the index of the i-th antenna port corresponding to each time domain resource, or the index of the i-th antenna port in the M antenna ports corresponding to each time-frequency resource, wherein i is an integer, i can take 1 to M or i can take 0 to M-1, j is an integer, j can take 1 to 16 or 0 to 15. The following is only described by taking p j ∈{1000,1001,…,1015} as an example, in addition, p j ∈{1000,1001,…,1015} can also be replaced by p j ∈{1001,1001,…,1016}.

[0251] Further, after determining the value of M, the terminal can determine the time domain resources corresponding to the N antenna ports respectively according to the value of M.

[0252] For example, if M = 8, the terminal determines that each time domain resource corresponds to 8 antenna ports, or 1 / 2 of the total number of antenna ports corresponding to each time domain resource. That is, if M = 8, The antenna port corresponding to each time domain resource can be defined by a protocol or configured in advance for the terminal device.

[0253] Example 1: If M = 8, assuming that the reference signal is SRS, when l' is the number of OFDM symbols in the SRS resource,

[0254] If then p j ∈ {1000, 1001, 1002, 1003, 1008, 1009, 1010, 1011}, if then p j ∈ {1004, 1005, 1006, 1007, 1012, 1013, 1014, 1015}.

[0255] It can be understood that in the above example 1, the antenna port corresponding to each time domain symbol is only an example and is not a limitation of the present application. For example, when l' is even, p j may also be even, and when l' is odd, p j may also be odd.

[0256] Exemplarily, if M = 4, the terminal determines that each time domain resource corresponds to 4 antenna ports, or 1 / 4 of the total number of antenna ports corresponding to each time domain resource. That is, if M = 4, The antenna port corresponding to each time domain resource can be defined by a protocol or configured in advance for the terminal device.

[0257] Example 2: If M = 4, assuming that the reference signal is SRS, when l' is the number of OFDM symbols in the SRS resource,

[0258] If then p j ∈ {1000, 1001, 1008, 1009}; if then p j ∈ {1002, 1003, 1010, 1011}; if then p j ∈ {1004, 1005, 1012, 1013}; if then p j ∈ {1006, 1007, 1014, 1015}.

[0259] It can be understood that in the above example 2, the antenna port corresponding to each time domain symbol is only an example and is not a limitation of the present application.

[0260] Step 510: The terminal determines the cyclic shift corresponding to each of the N antenna ports, where N = 16.

[0261] Among them, cyclic shift can also be called code field cyclic shift.

[0262] In one possible implementation, if M = 8;

[0263] If M = 4;

[0264] In other words, different methods can be used to determine the relationship with p for different values ​​of M. j corresponding

[0265] It is understood that the above possible implementations are merely examples and are not intended to limit this application.

[0266] For example, the terminal can know the maximum cyclic shift number. With the number of comb teeth K TC The corresponding relationships are shown in Table 1 or Table 3, for example. Among them, the comb tooth value K... TC This can be indicated by the higher-level parameter "transmissionComb", and the terminal can then determine the comb tooth value K indicated by the higher-level parameter. TC and the maximum cyclic shift. With the number of comb teeth K TC The correspondence is determined with the comb tooth value K. TC The corresponding maximum cyclic shift number In addition, the comb tooth value K TC Other parameters may also be used to indicate this, but this application does not limit this.

[0267] For example, if the number of comb teeth K TC The maximum cyclic shift value is 8. The value is 6. If the number of comb teeth K... TC The maximum cyclic shift value is 4. The number is 12. If the number of comb teeth K... TC The maximum cyclic shift value is 2. It is 8.

[0268] The cyclic shift corresponding to the i-th antenna port can be determined according to Formula 2 above.

[0269] For example, if M = 8, p j =1009, Then according to Furthermore, since M = 8, according to and choose calculating the cyclic shift.

[0270] In step 520, the terminal determines the reference signal sequence corresponding to the i-th antenna port of the M antenna ports corresponding to each time domain resource according to the cyclic shift corresponding to the i-th antenna port.

[0271] For example, if the reference signal is SRS, the formula for generating the SRS sequence by the terminal can refer to the related content in step 410 described above.

[0272] For example, if M=8, in combination with the above example one,

[0273] For example, if M=4, in combination with the above example two,

[0274] In step 530, the terminal transmits the corresponding reference signal on the time-frequency resource corresponding to the N antenna ports. Correspondingly, the access network device receives the corresponding reference signal on the time-frequency resource corresponding to the N antenna ports.

[0275] wherein the reference signal sequence corresponding to the i-th antenna port of the M antenna ports corresponding to each time domain resource is mapped to the i-th frequency domain resource, the i-th frequency domain resource is determined according to the frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take 1 to M or i can take 0 to M-1.

[0276] The following describes how to determine the frequency domain comb corresponding to the i-th antenna port of the M antenna ports corresponding to each time domain resource through three possible implementation manners. In the following formula, is a comb offset, For example, It can also be indicated by the high-level parameter “transmissionComb”, in addition, It can also be indicated by other parameters, which are not limited by the present application.

[0277] Possible implementation manner A: the frequency domain comb corresponding to the i-th antenna port can be determined according to the above formula 1.

[0278] Possible implementation manner B: if M=8;

[0279] If the comb value K TC is an even number greater than 8, the frequency domain comb corresponding to the i-th antenna port of the M antenna ports corresponding to each time domain resource satisfies the following relationship, which can be specifically expressed as the following formula g:

[0280] wherein u is an integer greater than or equal to 4. For example, the value of u and the comb value K TCThe value of u is related to the comb value K TC and the maximum cyclic shift number The value of u is related to the comb value K TC The greater the value of K

[0281] It should be noted that the above possible implementation manner B can be applied to the scenario that the comb value K TC is an even integer greater than 8 or the comb value K TC is an integer greater than 8 and is an integer multiple of 4, that is, table 1 can be updated to table 3. Wherein, X is an exemplary newly added comb value K TC . X can be an even integer greater than 8, for example, X can be 10, 12, 16, etc., which is not limited in the present application. Or, X can be an integer greater than 8 and is an integer multiple of 4. For example, X can be 12, 16, etc. Wherein, the greater the value of X, the greater the value of u. In addition, X can also be an integer greater than 8 and is an integer multiple of 8, for example, X can be 16, 32, etc. Correspondingly, Y is the newly added maximum cyclic shift number corresponding to X. Exemplarily, Y can be an integer less than or equal to 6, for example, the value of Y can be 6, 4, 2. As a possible example, X = 16, Y = 4. With the above design, for terminals in the air, generally in the environment without shielding and communicating with other devices, and then the frequency domain is also relatively flat, which can support a larger value of X.

[0282] When K TC is an even integer greater than 8 or K TC is an integer greater than 8 and is an integer multiple of 4, the corresponding can be predefined by the protocol, and at the same time, when calculating the cyclic shift corresponding to the N antenna ports respectively, the above formula a can be used.

[0283] At this time, the above formula 2 can be updated to formula 2-2.

[0284] For example, when the comb value K TC is 16, the maximum cyclic shift number is 4 or 6, the above formula g can be updated as:

[0285] At this time, u = 4.

[0286] At this time, the above formula 1 can be updated to formula 1-4:

[0287] Possible implementation manner C: if M = 4;

[0288] If the comb value K TCFor an even number greater than 8, the frequency domain comb corresponding to the i-th antenna port in the M antenna ports corresponding to each time domain resource satisfies the following relationship, which can be expressed as the following formula h:

[0289] wherein v is an integer greater than or equal to 8. Exemplarily, the value of v is related to the comb value K TC or the value of v is related to the comb value K TC and the maximum cyclic shift number For example, the larger the comb value K TC is, the larger the value of v is.

[0290] It should be noted that the above possible implementation manner C has the same applicable scenario as the possible implementation manner B, and can be applied to the scenario where the comb value K TC is an even number greater than 8 or the comb value K TC is an integer greater than 8 and is an integer multiple of 4, that is, Table 3.

[0291] For example, when the comb value K TC is 16 and the maximum cyclic shift number is 4 or 6, the above formula h can be updated as:

[0292] At this time, v = 8.

[0293] At this time, the above formula 1 can be updated as formula 1-5:

[0294] Exemplarily, in combination with the above various formulas, the terminal can determine the mapping relationship between the N antenna ports and the corresponding frequency domain comb and cyclic shift, and further, according to the mapping relationship, the terminal transmits the corresponding reference signal on the time-frequency resources respectively corresponding to the N antenna ports.

[0295] The following is described in combination with a specific example:

[0296] Example a: for M = 8, in combination with the above formula 1 and formula 2, the following Table 9 can be obtained, that is, the mapping relationship between the 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0297] Table 9: Mapping relationship between 8 antenna ports corresponding to each time domain symbol and corresponding frequency domain comb and cyclic shift

[0298] Example b: for K TC = 2, M=8, combining the above Formula 1 and Formula 2, the following Table 10 can be obtained, that is, the mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0299] Table 10: Mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0300] Example c: for K TC = 4, M=8, combining the above Formula 1 and Formula 2, the following Table 11 can be obtained, that is, the mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0301] Table 11: Mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0302] Example d: for K TC = 8, M=8, combining the above Formula 1 and Formula 2, the following Table 12 can be obtained, that is, the mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0303] Table 12: Mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0304] Example e: for K TC = 2, M=4, combining the above Formula 1 and Formula 2, the following Table 13 can be obtained, that is, the mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0305] Table 13: Mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0306] Example f: for K TC = 2, M=4, combining the above Formula 1 and Formula 2, the following Table 14 can be obtained, that is, the mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0307] Table 14: Mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0308] Example g: for K TC = 4, M=4, combining the above Formula 1 and Formula 2, the following Table 15 can be obtained, that is, the mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0309] Table 15: Mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0310] Example h: for K TC = 4, M=4, combining the above Formula 1 and Formula 2, the following Table 16 can be obtained, that is, the mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0311] Table 16: Mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0312] Example i: for K TC = 8, M=4, combining the above Formula 1 and Formula 2, the following Table 12 can be obtained, that is, the mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0313] Table 17: Mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0314] Example j, for K TC = 16, M=8, combining the above Formula a and Formula g, the following Table 18 can be obtained, that is, the mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0315] Table 18: Mapping relationship of 8 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0316] Example j, for K TC = 16, M=4, combining the above Formula a and Formula h, the following Table 19 can be obtained, that is, the mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift is obtained.

[0317] Table 19: Mapping relationship of 4 antenna ports corresponding to each time domain symbol and the corresponding frequency domain comb and cyclic shift

[0318] At step 540, the access network device parses the reference signal corresponding to each antenna port according to the cyclic shift corresponding to each antenna port.

[0319] For example, the access network device can first determine the cyclic shift corresponding to each antenna port, and then parse the reference signal corresponding to each antenna port according to the obtained cyclic shift corresponding to each antenna port. The access network device determines the cyclic shift corresponding to each antenna port can refer to step 510 described above, which will not be repeated here.

[0320] With the embodiment shown in FIG. 5, the terminal can send the reference signal through 16 antenna ports, and send the reference signal corresponding to each of the M antenna ports on 1 time domain symbol. For example, 16 antenna ports are mapped to 2 or 4 time domain resources, so that the access network device can quickly obtain the reference signal of all 16 antenna ports, and further estimate the channel to obtain higher throughput and reliability. In addition, the newly added K TC The value of K TC may be larger, so that a larger frequency domain comb number can be used, so that the frequency domain overhead is smaller, and thus a higher throughput can be obtained.

[0321] It can be understood that, in order to implement the functions in the above embodiments, each device (for example, a terminal or an access network device, etc.) includes a hardware structure and / or a software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the units and method steps of each example described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in hardware or computer software driven hardware depends on the specific application scenario and design constraints of the technical solution.

[0322] FIGS. 6 and 7 are structural schematic diagrams of possible communication apparatuses provided by embodiments of the present application. These communication apparatuses can be used to implement the functions of each device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments.

[0323] As shown in FIG. 6, the communication apparatus 600 includes a processing unit 610 and a transceiver unit 620.

[0324] When the communication apparatus 600 is used to implement the functions of the terminal in the method embodiment shown in FIG. 4, the processing unit 610 is configured to:

[0325] determine the cyclic shift corresponding to each of the N antenna ports, where N = 16; and determine the reference signal sequence corresponding to each of the N antenna ports according to the cyclic shift corresponding to each of the N antenna ports;

[0326] The transceiver 620 is configured to transmit corresponding reference signals on time-frequency resources corresponding to the N antenna ports respectively, wherein a reference signal sequence corresponding to an i-th antenna port in the N antenna ports is mapped to an i-th frequency domain resource, the i-th frequency domain resource is determined according to a frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take 1 to 16 or 0 to 15, the N antenna ports correspond to the same time domain resource, and the total number of antenna ports corresponding to each time domain resource is N.

[0327] In a possible design, the transceiver 620 is configured to determine that time division multiplexing (TDM) is not used for transmitting the reference signals in a case where the indication information is not received, wherein the indication information indicates that the TDM is used for transmitting the reference signals.

[0328] In a possible design, the transceiver 620 is configured to determine the i-th antenna port corresponding to each time domain resource according to the following formula: p i i is an index of the i-th antenna port, i is an index of the i-th antenna port corresponding to each time domain resource.

[0329] In a possible design, the maximum cyclic shift number is 6, and the cyclic shift corresponding to the i-th antenna port is determined according to the following formula:

[0330] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0331] In a possible design, the maximum cyclic shift number is 12, and the cyclic shift corresponding to the i-th antenna port is determined according to the following formula:

[0332] wherein, is a cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0333] In a possible design, the maximum cyclic shift number is 8, and the cyclic shift corresponding to the i-th antenna port is determined according to the following formula:

[0334] wherein, is a cyclic shift value, is the maximum cyclic shift number, wherein, for each time-domain resource,

[0335] In one possible design, the frequency-domain comb for the i-th antenna port is determined by:

[0336] wherein, is the comb offset, K TC is the comb value.

[0337] In one possible design, the comb value K TC is an even integer larger than 8; and the frequency-domain comb for the i-th antenna port is determined by:

[0338] wherein, is the comb offset, is an index of the i-th antenna port corresponding to each time-domain resource, and s is an integer larger than or equal to 2.

[0339] In one possible design, the comb value K TC is 16, and the maximum cyclic shift number is 4 or 6;

[0340] if the frequency-domain comb for the i-th antenna port is determined by:

[0341] if the frequency-domain comb for the i-th antenna port is determined by:

[0342] wherein, is an index of the i-th antenna port corresponding to each time-domain resource, is the comb offset, K TC is the comb value.

[0343] When the communications device 600 is used to implement the functions of the access network device in the method embodiments shown in FIG. 4 described above,

[0344] The transceiver unit 620 is configured to receive corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively, where N=16, the frequency domain resource corresponding to the i-th antenna port in the N antenna ports is determined according to the frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take 1 to 16 or 0 to 15, the time domain resources corresponding to the N antenna ports are the same, and the total number of antenna ports corresponding to each time domain resource is N.

[0345] The processing unit 610 is configured to analyze the reference signal corresponding to each antenna port according to the cyclic shift corresponding to the antenna port.

[0346] In a possible design, p i is the index of the i-th antenna port, is the index of the i-th antenna port corresponding to each time domain resource.

[0347] In a possible design, the maximum cyclic shift number is 6; the cyclic shift corresponding to the i-th antenna port is determined by the following formula:

[0348] wherein, is the cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0349] In a possible design, the maximum cyclic shift number is 12; the cyclic shift corresponding to the i-th antenna port is determined by the following formula:

[0350] wherein, is the cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0351] In a possible design, the maximum cyclic shift number is 8; the cyclic shift corresponding to the i-th antenna port is determined by the following formula:

[0352] wherein, is the cyclic shift value, is the maximum cyclic shift number, is the total number of antenna ports corresponding to each time domain resource,

[0353] In a possible design, the frequency domain comb corresponding to the ithantenna port is determined according to the following formula:

[0354] wherein, is the comb offset, K TC is the comb value.

[0355] In a possible design, the comb value K TC is an even integer greater than 8; and the frequency domain comb corresponding to the ithantenna port is determined according to the following formula:

[0356] wherein, is the comb offset, is an index of the ithantenna port corresponding to each time domain resource, and s is an integer greater than or equal to 2.

[0357] In a possible design, the comb value K TC is 16, and the maximum cyclic shift number is 4 or 6;

[0358] If the frequency domain comb corresponding to the ithantenna port is determined according to the following formula:

[0359] If the frequency domain comb corresponding to the ithantenna port is determined according to the following formula:

[0360] wherein, is an index of the ithantenna port corresponding to each time domain resource, is the comb offset, K TC is the comb value.

[0361] When the communications device 600 is configured to implement the functions of the terminal in the method embodiment shown in FIG. 5, the following applies:

[0362] The processing unit 610 is configured to determine time domain resources corresponding to N antenna ports respectively, where N=16, a total number of antenna ports corresponding to each time domain resource is M, M is less than N, and N is an integer multiple of M; determine cyclic shifts corresponding to the N antenna ports respectively; determine reference signal sequences corresponding to the N antenna ports respectively according to the cyclic shifts corresponding to the N antenna ports respectively; and the transceiver unit 620 is configured to send corresponding reference signals on time-frequency resources corresponding to the N antenna ports respectively, where a reference signal sequence corresponding to an i-th antenna port in the M antenna ports corresponding to each time domain resource is mapped to an i-th frequency domain resource, the i-th frequency domain resource is determined according to a frequency domain comb corresponding to the i-th antenna port, i is an integer, and i can take values from 1 to M or i can take values from 0 to M-1.

[0363] In a possible design, the transceiver unit 620 is configured to receive indication information, where the indication information indicates that the reference signals are transmitted using TDM, and M is a default value, the default value being 8 or 4; or the indication information indicates a value of M, the value of M being 8 or 4.

[0364] In a possible design, M=8.

[0365] where p j ∈{1000,1001,…,1015}, p j is an index of the i-th antenna port, j is an integer, and j can take values from 1 to 16 or 0 to 15. is an index of the i-th antenna port corresponding to each time domain resource.

[0366] In a possible design, the comb value K TC is an even integer greater than 8; and a frequency domain comb corresponding to the i-th antenna port is determined according to the following formula:

[0367] wherein is a comb offset, u is an integer greater than or equal to 4.

[0368] In a possible design, M=4.

[0369] where p j ∈{1000,1001,…,1015}, p j is an index of the j-th antenna port, j is an integer, and j can take values from 1 to 16 or 0 to 15. is an index of the i-th antenna port corresponding to each time domain resource.

[0370] In one possible design, the comb tooth value K TC It is an even number greater than 8; the frequency domain comb corresponding to the i-th antenna port is determined by the following formula:

[0371] in, This is the offset of the comb teeth. v is an integer greater than or equal to 8.

[0372] When the communication device 600 is used to implement the function of the access network device in the method embodiment shown in FIG5 above:

[0373] The transceiver unit 620 is used to receive corresponding reference signals on the time-frequency resources corresponding to N antenna ports respectively, where N = 16, the total number of antenna ports corresponding to each time-domain resource is M, M is less than N, and N is an integer multiple of M; the frequency domain resource corresponding to the i-th antenna port among the M antenna ports corresponding to each time-domain resource is determined according to the frequency domain comb corresponding to the i-th antenna port, where i is an integer, i can be from 1 to M or i can be from 0 to M-1; the processing unit 610 is used to parse the reference signals corresponding to the corresponding antenna ports according to the cyclic shift corresponding to the N antenna ports respectively.

[0374] In one possible design, the transceiver unit 620 is configured to send indication information indicating that the reference signal is transmitted using TDM, with M being a default value of 8 or 4; or, the indication information indicating the value of M, with M being 8 or 4.

[0375] In one possible design, M = 8;

[0376] Where, p j ∈{1000,1001,…,1015}, p j Let j be the index of the i-th antenna port, where j is an integer that can take values ​​from 1 to 16 or from 0 to 15. Let be the index of the i-th antenna port corresponding to each time-domain resource.

[0377] In one possible design, the comb tooth value K TC It is an even number greater than 8; the frequency domain comb corresponding to the i-th antenna port is determined by the following formula:

[0378] in, This is the offset of the comb teeth. u is an integer greater than or equal to 4.

[0379] In one possible design, M = 4;

[0380] wherein p j ∈{1000,1001,…,1015},p j is an index of the j th antenna port, j is an integer, j can take values from 1 to 16 or 0 to 15, is an index of the i th antenna port corresponding to each time domain resource.

[0381] In a possible design, the comb value K TC is an even integer greater than 8; the frequency domain comb corresponding to the i th antenna port is determined by using the following formula:

[0382] wherein, is a comb offset, v is an integer greater than or equal to 8.

[0383] More details about the processing unit 610 and the transceiver unit 620 can be directly obtained by referring to the related description in the above method embodiments, and thus will not be repeated here.

[0384] As shown in FIG. 7, the communication apparatus 700 includes a processor 710 and an interface circuit 720. The processor 710 and the interface circuit 720 are coupled to each other. It can be understood that the interface circuit 720 can be a transceiver or an input / output interface. Optionally, the communication apparatus 700 can further include a memory 730, configured to store instructions executed by the processor 710 or store input data required by the processor 710 to run instructions or store data generated after the processor 710 runs instructions.

[0385] When the communication apparatus 700 is used to implement the method shown in FIG. 4 or FIG. 5, the processor 710 is configured to implement the functions of the processing unit 610, and the interface circuit 720 is configured to implement the functions of the transceiver unit 620.

[0386] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0387] In the present application, another example of the apparatus is provided, the notification apparatus comprising at least one processor and at least one memory, the at least one processor and the at least one memory being coupled, the at least one memory for storing instructions which, when executed by the at least one processor, cause the communication apparatus to perform the method in the above embodiments. Taking the communication apparatus comprising one processor and one memory as an example, as shown in FIG. 7, the communication apparatus 700 comprises one processor 710 and one memory 730. The processor 710 and the memory 730 are coupled, and the memory 730 stores instructions, when the instructions stored in the memory 730 are executed by the processor 710, the communication apparatus 700 performs the method executed by each device in the above embodiments.

[0388] The method steps in the embodiments of the present application can be implemented in hardware, or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, so that the processor can read information from, and write information to, the storage medium. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in the terminal or the access network device described above. The processor and the storage medium can also exist as discrete components in the terminal or the access network device.

[0389] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments are performed. The computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment or other programmable apparatus. The computer programs or instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer programs or instructions can be transferred from one website site, computer, server or data center to another website site, computer, server or data center through wired or wireless manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available media can be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or an optical medium, such as a digital video disc; or a semiconductor medium, such as a solid state disk. The computer readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0390] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0391] In the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship between the associated objects is described, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In the literal description of the present application, the character " / ", generally represents that the associated objects before and after are in an "or" relationship; in the formula of the present application, the character " / ", represents that the associated objects before and after are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0392] It can be understood that various numbers involved in the embodiments of the present application are only distinguished for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic.

Claims

1. A reference signal transmission method, characterized by, The method comprises: determining cyclic shifts corresponding to N antenna ports respectively, wherein N=16; determining reference signal sequences corresponding to the N antenna ports respectively according to the cyclic shifts corresponding to the N antenna ports respectively; transmitting corresponding reference signals on time-frequency resources corresponding to the N antenna ports respectively, wherein a reference signal sequence corresponding to an i-th antenna port in the N antenna ports is mapped to an i-th frequency domain resource, the i-th frequency domain resource is determined according to a frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take 1 to 16 or 0 to 15, time domain resources corresponding to the N antenna ports are the same, and a total number of antenna ports corresponding to each time domain resource is N.

2. The method of claim 1, wherein, Further comprising: in a case where indication information is not received, determining that time division multiplexing (TDM) is not used for transmitting the reference signal, wherein the indication information indicates that the TDM is used for transmitting the reference signal.

3. The method of claim 1 or 2, wherein, p i is an index of the i-th antenna port for the i-th time domain resource, is an index of the i-th antenna port corresponding to each time domain resource.

4. The method of claim 3, wherein, The maximum cyclic shift number is 6. The cyclic shift corresponding to the ith antenna port is determined by the following formula: wherein for the cyclic shift value, for the maximum cyclic shift number, a total number of antenna ports corresponding to each time domain resource, 5. The method of claim 3, wherein, The maximum cyclic shift number is 12. The cyclic shift corresponding to the ith antenna port is determined by the following formula: wherein for the cyclic shift value, for the maximum cyclic shift number, a total number of antenna ports corresponding to each time domain resource, 6. The method of claim 3, wherein, The maximum cyclic shift number is 8. The cyclic shift corresponding to the ith antenna port is determined by the following formula: wherein for the cyclic shift value, for the maximum cyclic shift number, a total number of antenna ports corresponding to each time domain resource, 7. The method of claim 3, wherein, The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: wherein for the comb offset amount, K TC is the comb value.

8. The method of claim 3, wherein, The comb value K TC is an even number greater than 8; The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: wherein for the comb offset amount, is an index of an i-th antenna port corresponding to each time domain resource, and s is an integer greater than or equal to 2.

9. The method of claim 3, wherein, The comb value K TC is 16, and the maximum cyclic shift number is 4 or 6; If The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: If The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: wherein an index of an i-th antenna port corresponding to each time domain resource, for the comb offset amount, K TC is the comb value.

10. A reference signal transmission method, comprising: The method comprises: receiving corresponding reference signals on time-frequency resources corresponding to N antenna ports respectively, wherein N=16, a frequency domain resource corresponding to an i-th antenna port in the N antenna ports is determined according to a frequency domain comb corresponding to the i-th antenna port, i is an integer, i can take 1 to 16 or 0 to 15, time domain resources corresponding to the N antenna ports are the same, and a total number of antenna ports corresponding to each time domain resource is N; analyzing reference signals corresponding to corresponding antenna ports according to cyclic shifts corresponding to the N antenna ports respectively.

11. The method of claim 10, wherein, p i is an index of the i-th antenna port corresponding to each time domain resource, is an index of the i-th antenna port corresponding to each time domain resource.

12. The method of claim 11, wherein, The maximum cyclic shift number is 6. The cyclic shift corresponding to the ith antenna port is determined by the following formula: wherein for the cyclic shift value, for the maximum cyclic shift number, a total number of antenna ports corresponding to each time domain resource, 13. The method of claim 11, wherein, The maximum cyclic shift number is 12. The cyclic shift corresponding to the ith antenna port is determined by the following formula: wherein for the cyclic shift value, for the maximum cyclic shift number, a total number of antenna ports corresponding to each time domain resource, 14. The method of claim 11, wherein, The maximum cyclic shift number is 8. The cyclic shift corresponding to the ith antenna port is determined by the following formula: wherein, for the cyclic shift value, for the maximum cyclic shift number, a total number of antenna ports corresponding to each time domain resource, 15. The method of claim 11, wherein, The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: wherein, for the comb offset amount, K TC is the comb value.

16. The method of claim 11, wherein, The comb value K TC is an even number greater than 8; The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: wherein for the comb offset amount, s is an integer greater than or equal to 2.

17. The method of claim 11, wherein, The comb value K TC is 16, and the maximum cyclic shift number is 4 or 6; If The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: If The frequency domain comb corresponding to the ith antenna port is determined by using the following formula: wherein, for the comb offset amount, K TC is the comb value.

18. A communications device, characterized by The computer program product comprises a program or instructions, when the program or instructions are executed by an apparatus, causing the apparatus to perform the method according to any one of claims 1 to 17.

19. A computer-readable storage medium, characterized in that, The computer program product comprises a program or instructions, when the program or instructions are executed by an apparatus, causing the apparatus to perform the method according to any one of claims 1 to 17.

20. A computer program product, characterised in that, The computer program product comprises a program or instructions, when the program or instructions are executed by an apparatus, causing the apparatus to perform the method according to any one of claims 1 to 17.

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