COMMUNICATION METHOD AND COMMUNICATION DEVICE

Abstract

The embodiments of the present application disclose a communication method and a communication device. The method includes: a terminal device transmits an uplink reference signal to an access network device based on a transmission pattern, and an uplink reference signal resource of the uplink reference signal includes N ports, and the N ports in the transmission pattern are carried on two or more OFDM symbols, or the N ports in the transmission pattern are carried on two or more frequency domain combs and one OFDM symbol, where N is an integer greater than 4; the terminal device receives pre-coding indication information from the access network device, and the pre-coding indication information indicates pre-coding for transmitting uplink data, and the pre-coding indication information is obtained by the access network device based on the uplink reference signal, and the rows of the matrix corresponding to the pre-coding have a one-to-one correspondence with the N ports. The N ports included in the same uplink reference signal resource are carried on two or more OFDM symbols, which can improve the orthogonality between the ports in the N ports.

Description

[Technical field]

[0001] This application claims priority to Chinese Patent Application No. 202210336427.3, entitled “COMMUNICATION METHOD AND COMMUNICATION APPARATUS,” filed with the State Intellectual Property Office of the People's Republic of China on March 31, 2022, the entire contents of which are incorporated herein by reference.

[0002] Technical Field The present application relates to the field of communications, and in particular to a communication method and device. [Background technology]

[0003] A channel sounding reference signal (SRS) is an uplink reference signal transmitted by a terminal device to an access network device (e.g., a base station). The SRS is used by the access network device to acquire an uplink (UL) channel of the terminal device, or the SRS is used by the access network device to acquire a downlink (DL) channel of the terminal device based on channel reciprocity to perform data scheduling for the terminal device based on channel information. Each SRS resource is N ap SRS It includes ∈{1,2,4,8} SRS ports, each of which corresponds to a specific time-frequency-code resource. In an ideal case, the SRS ports are orthogonal, and each SRS port corresponds to a physical antenna or a virtual antenna of a terminal device. When the orthogonality between SRS ports in a certain SRS resource is weak and the terminal device transmits an SRS that occupies the SRS resource, coherent transmission occurs between different antennas. As a result, the quality of the transmitted SRS is poor. Therefore, in order to ensure the signal quality of the SRS transmitted by the terminal device, a time-frequency mapping solution of the SRS resource that enables strong orthogonality between SRS ports needs to be studied. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application disclose a communication method and a communication device. [Means for solving the problem]

[0005] According to a first aspect, an embodiment of the present application provides a communication method, the method including: a terminal device transmits an uplink reference signal to an access network device based on a transmission pattern, an uplink reference signal resource of the uplink reference signal includes N ports, the N ports in the transmission pattern have at least two port groups, each port group corresponds to the same time-frequency resource, different port groups correspond to different time-frequency resources, the N ports in the transmission pattern are carried on two or more orthogonal frequency division multiplexing (OFDM) symbols, or the N ports in the transmission pattern are carried on two or more frequency domain combs and one OFDM symbol, N is an integer greater than 4, the terminal device receives pre-coding indication information from the access network device, the pre-coding indication information indicates pre-coding for transmitting uplink data, and a row of a matrix corresponding to the pre-coding has a one-to-one correspondence with the N ports.

[0006] Optionally, the precoding indication information is obtained by the access network device based on an uplink reference signal.

[0007] Optionally, the transmit antennas for transmitting uplink data correspond to ports in a plurality of uplink reference signals. The terminal device transmitting the uplink reference signal to the access network device based on the transmission pattern may be replaced by the terminal device transmitting the uplink reference signal based on the configuration information and the transmission pattern, where the configuration information instructs the terminal device to transmit the uplink reference signal based on the transmission pattern. The configuration information may be configuration information of an uplink reference signal resource, for example, a channel sounding reference signal (SRS) resource. The N ports in the transmission pattern being carried on two or more OFDM symbols may be replaced by the transmission pattern indicating that the N ports are carried on two or more OFDM symbols. The N ports in the transmission pattern being carried on two or more frequency domain combs and one OFDM symbol may be replaced by the transmission pattern indicating that the N ports are carried on two or more frequency domain combs and one OFDM symbol.

[0008] In this embodiment of the present application, the terminal device transmits an uplink reference signal to the access network device based on a transmission pattern, so that N (greater than 4) ports included in the uplink reference signal resource of the uplink reference signal are carried on two or more OFDM symbols. The N ports included in the same uplink reference signal resource are carried on two or more OFDM symbols, which can improve the orthogonality between ports in the N ports. The terminal device transmits an uplink reference signal to the access network device based on a transmission pattern, so that N (greater than 4) ports included in the uplink reference signal resource of the uplink reference signal are carried on two or more frequency domain combs and OFDM symbols. The pre-coding indication information indicates that the rows of the matrix corresponding to the pre-coding for transmitting the uplink data of the terminal device have a one-to-one correspondence with the N ports included in the uplink reference signal resource. This provides a solution of using an uplink reference signal resource including N ports to carry an uplink reference signal.

[0009] In one possible implementation, the method further includes: The terminal device determines whether a CS reference value indicator (n SRS CS ) to determine the transmission pattern from two or more patterns.

[0010] In this implementation, the terminal device includes a CS reference value indicator (n SRS CS ) to determine a transmission pattern from two or more patterns, which can quickly and accurately determine an appropriate transmission pattern for transmitting the uplink reference signal by the terminal device.

[0011] In one possible implementation, the method further includes: the terminal device determines a CS value for each SRS port based on the CS reference value indicator and an index of each SRS port in the N ports, where the CS value for each port is used to generate a transmission sequence for the port.

[0012] In this implementation, the CS value for each SRS port can be determined quickly and accurately.

[0013] In one possible implementation, the terminal device determining a CS value for each SRS port based on the CS reference value indicator and an index of each SRS port in the N ports includes: SRS (cs,i) Determine where n SRS cs,i =(n SRS cs +p i -1000) mod n SRS cs,max and p i represents the index (e.g., 1001) of the i-th port among the N ports, SRS cs,max represents the maximum CS indicator, and n SRS cs represents the CS reference value indicator, and the terminal device is SRS cs,i Based on the CS value α of the i-th port among the N ports i Determine where:

number

[0014] In this implementation,

number

[0015]

number

[0016] In one possible implementation, the terminal device determining a CS value for each SRS port based on a CS reference value indicator and an index of each SRS port in the N ports includes: SRS cs,max , and N ap SRS Based on

number

number

[0017] In this way, equally spaced, and as widely spaced as possible, CS values ​​can be assigned to ports located within the same time-frequency resource.

[0018] In one possible implementation, the method further includes: the terminal device determines the transmission pattern from two or more patterns according to a CS reference value indicator, a maximum CS indicator, and a symbol number included in the configuration information of the uplink reference signal resource, where the two or more patterns include at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern, the symbol number indicates a number of OFDM symbols carrying the N ports, and in the first pattern, a comb corresponding to a first port set of the N ports is

number

number

number

number

number

number

[0019] In this implementation, the terminal device receives the CS reference value (n SRS cs ), maximum CS(n SRS cs,max ), and determine the transmission pattern from two or more patterns based on the symbol number of the uplink reference signal, which can quickly and accurately determine an appropriate transmission pattern for transmitting the uplink reference signal by the terminal device.

[0020] In one possible implementation, the method further includes: the terminal device determines the transmission pattern from two or more patterns according to a CS reference value indicator and a maximum CS indicator of an uplink reference signal, the CS reference value indicator and the maximum CS indicator being included in the configuration information of the uplink reference signal resource.

[0021] In this implementation, the terminal device receives the CS reference value (n SRS cs ) and maximum CS(n SRS cs,max ) to determine the transmission pattern from two or more patterns based on the determined transmission pattern, which can quickly and accurately determine an appropriate transmission pattern for transmitting the uplink reference signal by the terminal device.

[0022] According to a second aspect, an embodiment of the present application provides another communication method, which includes: an access network device receives an uplink reference signal transmitted by a terminal device, an uplink reference signal resource of the uplink reference signal includes N ports, the N ports are carried on two or more orthogonal frequency division multiplexing OFDM symbols, or the N ports are carried on two or more frequency domain combs and one OFDM symbol, N being an integer greater than 4; the access network device transmits precoding indication information to the terminal device, the precoding indication information indicates precoding for transmitting uplink data of the terminal device, the precoding indication information is obtained by the access network device based on the uplink reference signal, and a row of a matrix corresponding to the precoding has a one-to-one correspondence with the N ports.

[0023] In this embodiment of the present application, an access network device receives an uplink reference signal transmitted by a terminal device, and the uplink reference signal resource includes N (greater than 4) ports; the access network device transmits precoding indication information to the terminal device, and the precoding indication information indicates that the rows of a matrix corresponding to precoding for transmitting uplink data of the terminal device have a one-to-one correspondence with the N ports included in the uplink reference signal resource. This provides a solution of using an uplink reference signal resource including N ports to carry an uplink reference signal.

[0024] According to a third aspect, an embodiment of the present application provides another communication method. The method includes: a terminal device transmits a plurality of uplink reference signals based on configuration information of a plurality of uplink reference signal resources, the terminal device receives precoding and transport layer number indication information, the precoding and transport layer number indication information indicates precoding and the number of transport layers for transmitting uplink data of the terminal device, the precoding and transport layer number indication information corresponds to the plurality of uplink reference signals, the number of transport layers is less than or equal to the total number of ports included in the plurality of uplink reference signals, the number of rows of a matrix corresponding to the precoding is the total number of ports included in the plurality of uplink reference signals, and the rows of the matrix correspond one-to-one to the ports included in the plurality of uplink reference signals. The total number of ports included in the plurality of uplink reference signals may be understood as the total number of ports included in the plurality of uplink reference signal resources.

[0025] Optionally, the precoding and transport layer number indication information is obtained by the access network device based on an uplink reference signal.

[0026] Optionally, a transmit antenna for transmitting uplink data corresponds to a port in the plurality of uplink reference signals.

[0027] Optionally, the pre-coding and transport layer number indication information includes a plurality of first indication information, and the plurality of first indication information has a one-to-one correspondence with the plurality of uplink reference signal resources.

[0028] Optionally, the number of transport layers for uplink data is a sum of the numbers of transport layers indicated in said plurality of first indication information.

[0029] In this embodiment of the present application, an uplink reference signal corresponding to a codebook-based uplink data transmission is carried on the multiple uplink reference signal resources. The method can support flexible resource configuration of the uplink reference signal, as well as a corresponding precoding indication and a corresponding transport layer number indication.

[0030] According to a fourth aspect, an embodiment of the present application provides another communication method, the method including: an access network device receives a plurality of uplink reference signals from a terminal device; the access network device generates precoding and transport layer number indication information based on the plurality of uplink reference information; the access network device transmits the precoding and transport layer number indication information to the terminal device, the precoding and transport layer number indication information indicating a precoding and transport layer number for transmitting uplink data of the terminal device, the precoding and transport layer number indication information corresponds to the plurality of uplink reference signals, the transport layer number is less than or equal to a total number of ports included in the plurality of uplink reference signals, the number of rows of a matrix corresponding to the precoding is the total number of ports included in the plurality of uplink reference signals, and the rows of the matrix correspond one-to-one to the ports included in the plurality of uplink reference signals.

[0031] In this embodiment of the present application, the access network device sends precoding and transport layer number indication information to the terminal device, where the precoding and transport layer number indication information corresponds to the multiple uplink reference signals, and there is no need to send one precoding and transport layer number indication information for each uplink reference signal, which can reduce signaling overhead.

[0032] According to a fifth aspect, an embodiment of the present application provides a terminal device. The terminal device has a function for performing the operations in the method embodiment in the first aspect. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the aforementioned functions. In one possible implementation, the terminal device includes a transceiver module and a processing module. The processing module is configured to control the transceiver module to transmit an uplink reference signal to an access network device based on a transmission pattern, where an uplink reference signal resource of the uplink reference signal includes N ports, the N ports in the transmission pattern correspond to different time-frequency resources, the N ports in the transmission pattern are carried on two or more OFDM symbols, or the N ports in the transmission pattern are carried on two or more frequency domain combs and one OFDM symbol, and N is an integer greater than 4. The transceiver module is further configured to receive precoding indication information from the access network device, where the precoding indication information indicates precoding for transmitting uplink data, the precoding indication information is obtained by the access network device based on the uplink reference signal, and the rows of the matrix corresponding to the precoding are in one-to-one correspondence with the N ports. The processing module configured to control the transceiver module to transmit the uplink reference signal to the access network device based on the transmission pattern may be replaced by the processing module configured to control the transceiver module to transmit the uplink reference signal based on the transmission pattern based on configuration information, where the configuration information instructs the terminal device to transmit the uplink reference signal based on the transmission pattern.

[0033] In one possible implementation of the first or fifth aspect, the uplink reference signal is an SRS, the uplink reference signal resource is an SRS resource, the uplink data is carried on a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH), N is 8, and the method further includes: the terminal device maps the uplink data to antenna ports based on precoding, the number of antenna ports is the same as the number of ports in the SRS resource, and the antenna ports have a one-to-one correspondence with the ports in the SRS resource.

[0034] This implementation provides a resource mapping solution where the SRS resource includes eight SRS ports, and supports SRS resource design in scenarios where a large number of SRS ports exist.

[0035] In one possible implementation of the first or fifth aspect, N is 8, and the N ports in the transmit pattern (as shown) are carried in two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 2, where two ports located in the same frequency-domain comb and OFDM symbol correspond to two different cyclic shifts (CS), the N ports in the transmit pattern (as shown) are carried in one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 2, where four ports located in the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmit pattern (as shown) are carried in two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 2, where four ports located in the same frequency-domain comb and OFDM symbol correspond to four different CS values.

[0036] In this implementation, the base station can flexibly configure the transmission pattern based on the channel state of the terminal device. Specifically, when the uplink transmission power of the terminal device is limited, a transmission pattern occupying multiple OFDM symbols may be configured. However, when the base station has high requirements for the phase accuracy of the terminal device, a transmission pattern occupying one OFDM symbol may be configured.

[0037] In one possible implementation of the fifth aspect, the processing module may further include a CS reference value indicator (n SRS cs ) to determine the transmission pattern from two or more patterns. In this implementation, the terminal device is further configured to determine the transmission pattern from two or more patterns based on a CS reference value indicator (n SRS cs ), and switch the transmission pattern based on redundant information in a CS reference value indicator, which can simplify configuration signaling design.

[0038] In one possible implementation of the fifth aspect, the processing module is further configured to determine a CS value for each SRS port based on the CS reference value indicator and an index of each SRS port among the N ports. The CS value for each port is used to generate a transmission sequence for the port.

[0039] In one possible implementation of the fifth aspect, the processing module specifically includes: SRS cs,i determining

number

number

[0040] In this implementation,

number

[0041] In one possible implementation of the fifth aspect, the processing module specifically receives: a CS reference value indicator; an index of each SRS port in the N ports; n SRS cs,max , and N ap SRS Based on

number

number

[0042] In one possible implementation of the first or fifth aspect, the configuration information may include a comb position indicator of an uplink reference signal.

number

number

number

number

number

number

[0043] In this implementation, the manner in which the N ports in the transmit pattern are carried on frequency domain combs and OFDM symbols can enable strong orthogonality between the ports, and one SRS resource occupying multiple OFDM symbols can increase the power spectral density of each SRS port.

[0044] In one possible implementation of the first or fifth aspect, N is 8, and the N ports in the transmit pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports in the transmit pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. the N ports in the transmit pattern are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmit pattern are carried on four frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values.

[0045] In this implementation, the manner in which the N ports in the transmit pattern are carried on frequency domain combs and OFDM symbols can enable strong orthogonality between the ports.

[0046] In one possible implementation of the first or fifth aspect, the configuration information includes a comb position indicator

number

number

number

number

number

number

number

[0047] In this implementation, the manner in which the N ports in the transmit pattern are carried on frequency domain combs and OFDM symbols can enable strong orthogonality between the ports, and one SRS resource occupying multiple OFDM symbols can increase the power spectral density of each SRS port.

[0048] In one possible implementation of the fifth aspect, the processing module is further configured to determine the transmission pattern from two or more patterns based on a CS reference value indicator, a maximum CS indicator, and a number of symbols included in uplink reference signal resource configuration information, the two or more patterns including at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern, the number of symbols indicating a number of OFDM symbols carrying N ports; in the first pattern, a comb corresponding to a first port set of the N ports is

number

number

number

number

number

number

[0049] In this implementation, the terminal device receives the CS reference value (n SRS cs ), maximum CS(n SRS cs,max ), and determine the transmission pattern from two or more patterns based on the number of symbols of the uplink reference signal, which can quickly and accurately determine an appropriate transmission pattern for transmitting the uplink reference signal by the terminal device.

[0050] In one possible implementation of the first or fifth aspect, N is 8, and the N ports in the transmit pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 8, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports in the transmit pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. the N ports in the transmit pattern are carried on two frequency-domain combs with a frequency-domain comb number of 8 and one OFDM symbol, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmit pattern are carried on four frequency-domain combs with a frequency-domain comb number of 8 and one OFDM symbol, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values.

[0051] In this implementation, the manner in which the N ports in the transmit pattern are carried on frequency domain combs and OFDM symbols can enable strong orthogonality between the ports.

[0052] In one possible implementation of the first or fifth aspect, the transmission power of the uplink reference signal is determined based on a transmission pattern, and the transmission pattern is: symb SRS When we show that the signal is carried on OFDM symbols, the maximum transmit power of each port is P CMAX ×N symb SRS / N ap SRS Not exceeding P CMAX is the maximum transmit power configured for the terminal device, and N symb SRS is an integer greater than 1, and N ap SRS is equal to N.

[0053] In this implementation, N ports are symb SRS OFDM symbols, so that the actual transmission power of the SRS corresponding to the SRS resource is N symb SRS This can improve the channel measurement accuracy.

[0054] For technical effects of possible implementations of the fifth aspect, please refer to the description of the technical effects of the first aspect or the possible implementations of the first aspect.

[0055] According to a sixth aspect, an embodiment of the present application provides an access network device. The access network device has a function for implementing the operations in the method embodiment in the second aspect. The function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the aforementioned functions. In one possible implementation, the access network device includes a transceiver module and a processing module. The transceiver module is configured to receive an uplink reference signal transmitted by a terminal device, and an uplink reference signal resource of the uplink reference signal includes N ports, the N ports are carried on two or more orthogonal frequency division multiplexing OFDM symbols, or the N ports are carried on two or more frequency domain combs and one OFDM symbol, where N is an integer greater than 4. The processing module is configured to perform processing based on the uplink reference signal to obtain precoding indication information. The transceiver module is further configured to send pre-coding indication information to the terminal device, where the pre-coding indication information indicates pre-coding for transmitting uplink data of the terminal device, where the pre-coding indication information is obtained by the access network device based on the uplink reference signal, and where rows of the matrix corresponding to the pre-coding have a one-to-one correspondence with the N ports.

[0056] In one possible implementation of the second aspect or the sixth aspect, the uplink reference signal is an SRS, the uplink reference signal resource is an SRS resource, the uplink data is carried on a physical uplink shared channel PUSCH or a physical uplink control channel PUCCH, N is 8, pre-coding is used by the terminal device to map the uplink data to antenna ports, the number of antenna ports is the same as the number of ports in the SRS resource, and the antenna ports have a one-to-one correspondence with the ports in the SRS resource.

[0057] In this implementation, precoding is used by the terminal device to map uplink data to antenna ports, and the antenna ports have a one-to-one correspondence with the ports in the SRS resource, which provides a resource mapping solution in which the SRS resource includes eight SRS ports.

[0058] In one possible implementation of the second or sixth aspect, N is 8, and N ports are carried on two frequency-domain combs and two OFDM symbols, where the frequency-domain comb number is 2, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different cyclic shifts (CS); N ports are carried on one frequency-domain comb and two OFDM symbols, where the frequency-domain comb number is 2, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or N ports are carried on two frequency-domain combs and one OFDM symbol, where the frequency-domain comb number is 2, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values.

[0059] In this implementation, the manner in which the N ports are carried on the frequency domain comb and OFDM symbols can enable strong orthogonality between the ports.

[0060] In one possible implementation of the second or sixth aspect, N is 8, and N ports are carried on two frequency-domain combs and two OFDM symbols, where the frequency-domain comb number is 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; N ports are carried on one frequency-domain comb and two OFDM symbols, where the frequency-domain comb number is 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; N ports are carried on two frequency-domain combs and one OFDM symbol, where the frequency-domain comb number is 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or N ports are carried on four frequency-domain combs and one OFDM symbol, where the frequency-domain comb number is 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values.

[0061] In this implementation, the manner in which the N ports are carried on the frequency domain comb and OFDM symbols can enable strong orthogonality between the ports.

[0062] In one possible implementation of the second or sixth aspect, N ports are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 8, where two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; N ports are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 8, where four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; N ports are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, where four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or N ports are carried on four frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, where two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values.

[0063] In this implementation, the manner in which the N ports are carried on the frequency domain comb and OFDM symbols can enable strong orthogonality between the ports.

[0064] In one possible implementation of the second or sixth aspect, the comb corresponding to the first set of N ports is

number

number

number

[0065] In this implementation, the index of the OFDM symbol corresponding to the first port set is l, and the index of the OFDM symbol corresponding to the second port set is (l+n), which can improve the orthogonality between ports, and one SRS resource occupying multiple OFDM symbols can increase the power spectral density of each SRS port.

[0066] In one possible implementation of the second or sixth aspect, the combs corresponding to the first and second sets of ports of the N ports are

number

number

[0067] In this implementation, the index of the OFDM symbol corresponding to the first port set is l, and the index of the OFDM symbol corresponding to the second port set is (l+n), which can improve the orthogonality between ports, and one SRS resource occupying multiple OFDM symbols can increase the power spectral density of each SRS port.

[0068] In one possible implementation of the second or sixth aspect, a comb corresponding to a first set of ports of the N ports may include:

number

number

number

[0069] In this implementation, the index of the OFDM symbols corresponding to the first port set and the second port set is l. This can reduce the overhead of the OFDM symbols. The comb corresponding to the first port set is

number

number

[0070] In one possible implementation of the second or sixth aspect, the combs corresponding to four port sets of the N ports are

number

number

[0071] In this implementation, the combs corresponding to each of the four port sets are

number

[0072] In one possible implementation of the second or sixth aspect, the transmission power of the uplink reference signal is determined by the terminal device based on a transmission pattern, and the transmission pattern is: symb SRS If we indicate that the signal is carried on OFDM symbols, the maximum transmit power of each port is P CMAX ×N symb SRS / N ap SRS Not to exceed P CMAX is the maximum transmit power configured for the terminal device, and N symb SRS is an integer greater than 1, and N apSRS is equal to N.

[0073] In this implementation, N ports are symb SRS OFDM symbols, so that the actual transmission power of the SRS corresponding to the SRS resource is N symb SRS This can improve the channel measurement accuracy.

[0074] For technical effects of possible implementations of the sixth aspect, please refer to the description of the technical effects of the second aspect or possible implementations of the second aspect.

[0075] According to a seventh aspect, an embodiment of the present application provides another terminal device. The terminal device has a function of performing the operations in the method embodiment in the third aspect. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the aforementioned functions. In one possible implementation, the terminal device includes a transceiver module and a processing module. The processing module is configured to generate multiple uplink reference signals based on configuration information of multiple uplink reference signal resources. The transceiver module is configured to transmit the multiple uplink reference signals. The transceiver module is further configured to receive precoding and transport layer number indication information, where the precoding and transport layer number indication information indicates a number of precoding and transport layers for transmitting uplink data of the terminal device, the precoding and transport layer number indication information corresponds to a plurality of uplink reference signals, the number of transport layers is less than or equal to a sum of a number of ports included in the plurality of uplink reference signals, a number of rows of a matrix corresponding to the precoding is a sum of a number of ports included in the plurality of uplink reference signals, and the rows of the matrix have a one-to-one correspondence with the ports included in the plurality of uplink reference signals. The sum of the number of ports included in the plurality of uplink reference signals may be understood as a sum of a number of ports included in the plurality of uplink reference signal resources.

[0076] In one possible implementation of the third or seventh aspect, the multiple uplink reference signals are multiple SRSs, the multiple uplink reference signal resources are multiple SRS resources, the multiple uplink reference signal resources include two first SRS resources, and the first SRS resources include four ports.

[0077] In this implementation, the multiple uplink reference signal resources include two first SRS resources, the first SRS resources include four ports, and the rows of the matrix corresponding to the pre-coding have a one-to-one correspondence with the ports included in the multiple uplink reference signals, which can obtain a time-frequency resource mapping scheme of the ports (for example, eight ports) included in the multiple uplink reference signals based on the pre-coding and the transport layer number indication information.

[0078] In one possible implementation of the third or seventh aspect, the two first SRS resources include SRS resource 1 and SRS resource 2, an antenna port corresponding to a port of SRS resource 1 is in a first polarization direction, and an antenna port corresponding to a port of SRS resource 2 is in a second polarization direction; or for an i-th stream of uplink data transmission, the pre-coding corresponding to the port of SRS resource 1 is v i and the pre-coding corresponding to the port of SRS resource 2 is φ i ×v i and φ i =e jπn / 2 where n is an integer. i The number of elements in is 4, where i is a positive integer.

[0079] In another possible implementation, the pre-coding and transport layer number indication information includes two transport indication fields, the two transport indication fields have a one-to-one correspondence with the two uplink reference signal resources, the number of transport layers for the uplink data is a sum of the transport layer numbers indicated by the two transport indication fields, and the pre-coding and transport layer number indication information includes phase indication information φ indicating a phase rotation between antennas corresponding to the two uplink reference signal resources. i Further includes:

[0080] In another possible implementation, the precoding and transport layer number indication information may be one precoding beam indication field, one transport layer number indication field, and one phase indication information φ iThe pre-encoding beam indication field indicates a transmission beam corresponding to each uplink reference signal resource, the transport layer number indication field indicates the number of transport layers for uplink data, and the phase indication information φ i denotes the phase rotation between the antennas corresponding to the two uplink reference signal resources.

[0081] This implementation can ensure that antenna ports with the same polarization are used simultaneously for transmission on the same SRS resource, so that beams in the two polarization directions can be uniformly indicated. For each stream of data, only the inter-polarization phase deviation needs to be additionally indicated. This reduces the DCI indication precoding overhead.

[0082] Optionally, in the above implementation, the coherence capability of the terminal device is full coherence.

[0083] Optionally, in such implementations, the pre-coding is a full coherence codeword.

[0084] In one possible implementation of the third or seventh aspect, the multiple uplink reference signals are multiple SRSs, the multiple uplink reference signal resources are multiple SRS resources, the multiple uplink reference signal resources include two second SRS resources and one first SRS resource, the first SRS resource includes four ports, and the second SRS resource includes two ports; or the multiple uplink reference signal resources include four second SRS resources, and the second SRS resource includes two ports.

[0085] In this implementation, the rows of the matrix corresponding to the pre-coding have a one-to-one correspondence with the ports included in the multiple uplink reference signals. The terminal device can obtain a time-frequency resource mapping scheme of the ports (e.g., eight ports) included in the multiple uplink reference signals based on the pre-coding and the transport layer number indication information.

[0086] In one possible implementation of the third or seventh aspect, the uplink reference signal resource is an SRS resource, and a k-th SRS resource in the plurality of SRS resources is a (i 1 k ,…i mk k )th layer of the precoding 1 k ,…i mk k The row in which the non-zero element in the )th column is located has a one-to-one correspondence with the port of the kth SRS resource. k is a positive integer less than or equal to the number of ports in the k-th SRS resource, k is an integer greater than 0, any two of the plurality of SRS resources correspond to different layers of uplink data, and the uplink data corresponds to a PUSCH or a PUCCH.

[0087] Optionally, in such implementations, the pre-coding is a partial coherence codeword.

[0088] Optionally, in the above implementations, the coherence capability of the terminal device is partial coherence.

[0089] In this implementation, the antenna ports that can be used for coherent transmission are located in the same SRS resource. This ensures that the antenna ports for coherent transmission are used for transmission at the same time, and can improve the channel measurement accuracy of the base station. In addition, during precoding design, the phase needs to be indicated correspondingly for the ports only in one SRS resource. This simplifies the precoding design.

[0090] In one possible implementation of the third aspect or the seventh aspect, the pre-coding and transport layer number indication information includes a plurality of transport indication fields, the plurality of transport indication fields being in one-to-one correspondence with a plurality of uplink reference signal resources, rows of a matrix corresponding to the pre-coding in the plurality of transport indication fields being in one-to-one correspondence with ports in a corresponding uplink reference signal resource, and a number of transport layers of the uplink data is a sum of the number of transport layers indicated by the plurality of transport indication fields.

[0091] In this implementation, the rows of the matrix corresponding to the pre-coding in the multiple transport indication fields have a one-to-one correspondence with the ports in the corresponding uplink reference signal resources. According to the pre-coding and transport layer number indication information, the terminal device can obtain the relevant information of the multiple SRS resources for transmitting uplink data on the PUSCH or PUCCH, and the signaling overhead is low.

[0092] In one possible implementation of the third or seventh aspect, the plurality of uplink reference signal resources are a plurality of SRS resources, and the precoding and transport layer number indication information is precoding indication information, and the precoding and transport layer number indication information includes a sounding reference signal resource indicator (SRS resource indicator, SRI), a transmission rank indicator (TRI), and a transmission precoding matrix indicator (TPMI), where the SRI indicates two or more of the plurality of SRS resources, the TPMI indicates precoding, and the TRI indicates a transport layer.

[0093] In this implementation, the SRI indicates the number of SRS resources and the total number of ports included in the number of uplink reference signals in a row of the precoding matrix. Based on the precoding and transport layer number indication information, the terminal device can obtain related information of the number of SRS resources for transmitting uplink data on the PUSCH or PUCCH, and the signaling overhead is low.

[0094] In one possible implementation of the third or seventh aspect, each of the multiple SRS resources indicated by the SRI independently corresponds to a data layer transmitted on the PUSCH or PUCCH, in other words, the multiple SRS resources indicated by the SRI correspond to independent layers and layer mappings.

[0095] In this implementation, the multiple SRS resources indicated by the SRI correspond independently to data streams transmitted on the PUSCH or PUCCH, and the eight-port (i.e., eight SRS ports) SRS resource can be split and transmitted on multiple OFDM symbols, which supports increased SRS transmit power and improves channel measurement accuracy.

[0096] For technical effects of possible implementations of the seventh aspect, please refer to the description of the technical effects of the third aspect or possible implementations of the third aspect.

[0097] According to an eighth aspect, an embodiment of the present application provides another access network device. The access network device has a function of performing the operations in the method embodiment in the fourth aspect. The functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the aforementioned functions. In one possible implementation, the access network device includes a transceiver module and a processing module. The transceiver module is configured to receive a plurality of uplink reference signals from a terminal device. The processing module is configured to generate precoding and transport layer number indication information based on the plurality of uplink reference information. The transceiver module is further configured to send pre-coding and transport layer number indication information to the terminal device, where the pre-coding and transport layer number indication information indicates a number of pre-coding and transport layers for transmitting uplink data of the terminal device, where the pre-coding and transport layer number indication information corresponds to a plurality of uplink reference signals, where the number of transport layers is less than or equal to a sum of a number of ports included in the plurality of uplink reference signals, where a number of rows of the matrix corresponding to the pre-coding is a sum of a number of ports included in the plurality of uplink reference signals, and where the rows of the matrix have a one-to-one correspondence with the ports included in the plurality of uplink reference signals.

[0098] In one possible implementation of the fourth or eighth aspect, the multiple uplink reference signals are multiple SRSs, the multiple uplink reference signal resources are multiple SRS resources, the multiple uplink reference signal resources include two first SRS resources, and the first SRS resources include four ports.

[0099] In this implementation, the multiple uplink reference signal resources include two first SRS resources, the first SRS resources include four ports, and the rows of the matrix corresponding to the pre-coding have a one-to-one correspondence with the ports included in the multiple uplink reference signals. An eight-port (i.e., eight SRS ports) SRS may be transmitted in a manner that supports aggregation of multiple SRS resources.

[0100] In one possible implementation of the fourth or eighth aspect, the pre-coding is a full coherence codeword, and the two first SRS resources include SRS resource 1 and SRS resource 2, an antenna port corresponding to a port of SRS resource 1 is in a first polarization direction, and an antenna port corresponding to a port of SRS resource 2 is in a second polarization direction; or, for the i-th stream, the pre-coding corresponding to a port of SRS resource 1 is v i and the pre-coding corresponding to the port of SRS resource 2 is φ i ×v i and φ i =e jπn / 2 where n is an integer and v i The number of elements in is 4, where i is an integer.

[0101] This implementation can ensure that related transmissions cannot be performed between antenna ports.

[0102] In one possible implementation of the fourth or eighth aspect, the multiple uplink reference signals are multiple SRSs, the multiple uplink reference signal resources are multiple SRS resources, the multiple uplink reference signal resources include two second SRS resources and one first SRS resource, the first SRS resource includes four ports, and the second SRS resource includes two ports; or the multiple uplink reference signal resources include four second SRS resources, and the second SRS resource includes two ports.

[0103] In this implementation, the rows of the matrix corresponding to the precoding have a one-to-one correspondence with the ports included in the multiple uplink reference signals. The 8-port (i.e., 8 SRS ports) SRS can be transmitted in a manner that supports aggregation of multiple SRS resources. Since the time-frequency resource location of each SRS resource can be independently configured, the 8-port SRS can be split and transmitted on multiple OFDM symbols. This can support increased SRS transmission power and improve channel measurement accuracy. Also, in this way, the 2-port SRS and 4-port SRS resource designs supported by existing protocols and the design that maximizes reuse of existing TPMI codebooks can be used.

[0104] In one possible implementation of the fourth or eighth aspect, the pre-coding is a partial coherence codeword, the uplink reference signal resource is an SRS resource, and the k-th SRS resource in the plurality of SRS resources is a (i 1 k ,…i mk k )th layer of the precoding 1 k ,…i mk k The row in which the non-zero element in the )th column is located has a one-to-one correspondence with the port of the kth SRS resource. k is a positive integer less than or equal to the number of ports in the k-th SRS resource, k is an integer greater than 0, and any two of the plurality of SRS resources correspond to different layers of uplink data, and the uplink data corresponds to a PUSCH or a PUCCH.

[0105] In one possible implementation of the fourth or eighth aspect, the pre-coding and transport layer number indication information includes a plurality of transport indication fields, the plurality of transport indication fields being in one-to-one correspondence with a plurality of uplink reference signal resources, rows of a matrix corresponding to pre-coding in the plurality of transport indication fields being in one-to-one correspondence with ports in a corresponding uplink reference signal resource, and a number of transport layers of the uplink data is a sum of the number of transport layers indicated by the plurality of transport indication fields.

[0106] In this implementation, the rows of the matrix corresponding to the pre-coding in the multiple transport indication fields have a one-to-one correspondence with the ports in the corresponding uplink reference signal resources. According to the pre-coding and transport layer number indication information, the terminal device can obtain the relevant information of the multiple SRS resources for transmitting uplink data on the PUSCH or PUCCH, and the signaling overhead is low.

[0107] In one possible implementation of the fourth or eighth aspect, the multiple uplink reference signal resources are multiple SRS resources, the precoding and transport layer number indication information is precoding indication information, and the precoding and transport layer number indication information includes an SRI, a TRI, and a TPMI, where the SRI indicates two or more of the multiple SRS resources, the TPMI indicates the precoding, and the TRI indicates the transport layer.

[0108] In this implementation, the SRI indicates the number of SRS resources and the total number of ports included in the number of uplink reference signals in a row of the precoding matrix. Based on the precoding and transport layer number indication information, the terminal device can obtain related information of the number of SRS resources for transmitting uplink data on the PUSCH or PUCCH, and the signaling overhead is low.

[0109] In one possible implementation of the fourth or eighth aspect, each of the multiple SRS resources indicated by the SRI independently corresponds to a data stream transmitted on the PUSCH or the PUCCH, in other words, the multiple SRS resources indicated by the SRI correspond to independent streams and stream mappings.

[0110] In this implementation, multiple SRS resources indicated by the SRI correspond to data streams transmitted independently on the PUSCH or PUCCH, and an 8-port SRS may be split and transmitted over multiple OFDM symbols, supporting increased SRS transmit power and improving channel measurement accuracy.

[0111] In one possible implementation of the fourth or eighth aspect, the F ports included in the SRS resources indicated by the SRI correspond to N consecutive rows of the matrix, and the SRS resources indicated by the SRI correspond to the rows in ascending order of index in the matrix.

[0112] This implementation can reuse existing 2-port and 4-port SRS resource designs.

[0113] For technical effects of possible implementations of the eighth aspect, please refer to the description of the technical effects of the fourth aspect or possible implementations of the fourth aspect.

[0114] According to a ninth aspect, the present application provides a communications device, the communications device including a processor, the processor may be configured to execute computer-executable instructions stored in a memory, to perform a method according to the first aspect or any one of the possible implementations of the first aspect, to perform a method according to the second aspect or any one of the possible implementations of the second aspect, to perform a method according to the third aspect or any one of the possible implementations of the third aspect, or to perform a method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

[0115] In the embodiment of the present application, in the process of executing the aforementioned methods, the process of transmitting information in the aforementioned methods can be understood as a process of outputting information according to the instruction of a processor. When the information is output, the processor outputs the information to the transceiver, so that the transceiver transmits the information. After the information is output by the processor, the information may further require other processing and then arrives at the transceiver. Similarly, when the processor receives input information, the transceiver receives the information and inputs the information to the processor. Furthermore, after the transceiver receives the information, other processing may need to be performed on the information before the information is input to the processor.

[0116] Operations such as sending and / or receiving associated with a processor may be generally understood as instruction output based on the processor unless specifically described otherwise or unless the operation is inconsistent with the actual functionality or internal logic of the operation in the associated description.

[0117] In some implementations, the processor may be a processor specially configured to perform these methods, or may be a processor that executes computer instructions in a memory to perform these methods, such as a general-purpose processor. For example, the processor may be configured to execute a program stored in the memory. When the program is executed, the communication device is enabled to perform a method according to the first aspect or any one of the possible implementations of the first aspect. In some possible implementations, the memory is located external to the communication device. In some possible implementations, the memory is located internal to the communication device.

[0118] In embodiments of the present application, the processor and the memory may alternatively be integrated into one component, in other words, the processor and the memory may alternatively be integrated together.

[0119] In one possible implementation, the communication device further includes a transceiver configured to receive packets, transmit packets, and so on.

[0120] According to a tenth aspect, the present application provides another communication device. The communication device includes a processing circuit and an interface circuit. The interface circuit is configured to obtain data or output data. The processing circuit is configured to perform a corresponding method according to the first aspect or any one of the possible implementations of the first aspect, the processing circuit is configured to perform a corresponding method according to the second aspect or any one of the possible implementations of the second aspect, the processing circuit is configured to perform a corresponding method according to the third aspect or any one of the possible implementations of the third aspect, or the processing circuit is configured to perform a corresponding method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

[0121] According to an eleventh aspect, the present application provides a computer-readable storage medium configured to store a computer program which, when run on a computer, performs a method according to the first aspect or any one of the possible implementations of the first aspect, a method according to the second aspect or any one of the possible implementations of the second aspect, a method according to the third aspect or any one of the possible implementations of the third aspect, or a method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

[0122] According to a twelfth aspect, the present application provides a computer program product, the computer program product comprising a computer program or computer code, which, when run on a computer, performs a method according to the first aspect or any one of the possible implementations of the first aspect, a method according to the second aspect or any one of the possible implementations of the second aspect, a method according to the third aspect or any one of the possible implementations of the third aspect, or a method according to the fourth aspect or any one of the possible implementations of the fourth aspect.

[0123] According to a thirteenth aspect, the present application provides a communication system including a terminal device according to the fifth aspect or any one of the possible implementations of the fifth aspect, and an access network device according to the sixth aspect or any one of the possible implementations of the sixth aspect.

[0124] According to a fourteenth aspect, the present application provides another communication system including a terminal device according to the seventh aspect or any one of the possible implementations of the seventh aspect, and an access network device according to the eighth aspect or any one of the possible implementations of the eighth aspect. [Brief description of the drawings]

[0125] In order to more clearly describe the technical solutions in the embodiments of the present application or the background art, the following describes the accompanying drawings for illustrating the embodiments of the present application or the background art.

[0126] [Figure 1] FIG. 13 shows an example of three combs with different comb numbers according to the present application.

[0127] [Diagram 2] 1 shows examples of both scanning bandwidths and frequency modulation bandwidths according to the present application.

[0128] [Diagram 3]FIG. 2 is a diagram of a comparison between transmission powers according to an embodiment of the present application.

[0129] [Figure 4] 1 illustrates an example of a wireless communication system according to an embodiment of the present application.

[0130] [Diagram 5] 1 is an interactive flowchart of a communication method according to an embodiment of the present application.

[0131] [Figure 6] 4 is an interactive flowchart of another communication method according to an embodiment of the present application.

[0132] [Figure 7] 1 illustrates examples of a first pattern, a second pattern, and a third pattern according to an embodiment of the present invention.

[0133] [Figure 8] 4 is an interactive flow chart of another communication method according to an embodiment of the present application.

[0134] [Figure 9] 1 illustrates examples of a first pattern, a second pattern, a third pattern, and a fourth pattern according to an embodiment of the present invention.

[0135] [Figure 10] 4 is an interactive flow chart of another communication method according to an embodiment of the present application.

[0136] [Figure 11] 1 illustrates examples of a first pattern, a second pattern, a third pattern, and a fourth pattern according to an embodiment of the present invention.

[0137] [Figure 12] 4 is an interactive flow chart of another communication method according to an embodiment of the present application.

[0138] [Figure 13] 4 is an interactive flow chart of another communication method according to an embodiment of the present application.

[0139] [Figure 14] FIG. 1 is a diagram of an antenna architecture according to an embodiment of the present application.

[0140] [Figure 15] FIG. 2 is a diagram of another antenna architecture according to an embodiment of the present application.

[0141] [Figure 16] FIG. 2 is a diagram of another antenna architecture according to an embodiment of the present application.

[0142] [Figure 17] FIG. 17 shows the structure of a communication device 1700.

[0143] [Figure 18] FIG. 1 illustrates a structure of another communication device 180 according to an embodiment of the present application.

[0144] [Figure 19] FIG. 1 is a diagram of the structure of another communication device 190 according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0145] Terms such as "first", "second" and the like in the specification, claims and accompanying drawings of this application are merely used to distinguish different objects and are not used to describe a particular order. In addition, terms such as "comprise" and "have" and any other variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the recited steps or units, but instead optionally further includes unrecited steps or units or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0146] An "embodiment" referred to in this specification means that a particular feature, structure, or characteristic described in combination with an embodiment may be included in at least one embodiment of the present application. This phrase appearing in various places in this specification does not necessarily refer to the same embodiment, nor is it an exclusive independent or optional embodiment from another embodiment. It may be explicitly and implicitly understood by those skilled in the art that the embodiment described in this specification may be combined with another embodiment.

[0147] The terms used in the following embodiments of the present application are merely intended to describe certain embodiments and are not intended to limit the present application. As used in this specification and the appended claims of the present application, the singular terms "a," "an," "a," "the," and "this" are intended to include the plural, unless the context clearly dictates otherwise. Also, the term "and / or" as used in this application should be understood to mean and include any or all possible combinations of one or more of the listed items. For example, "A and / or B" can represent three cases: only A is present, only B is present, and both A and B are present. A and B can be singular or plural. As used in this application, the term "plurality" means more than one.

[0148] First, some concepts in the embodiments of the present application will be explained.

[0149] 1. SRS, SRS port, SRS comb

[0150] The SRS is an uplink reference signal transmitted by a terminal device to an access network device (e.g., a base station). The access network device obtains the UL channel of the terminal device based on the SRS transmitted by the terminal device, or obtains the DL channel of the terminal device based on channel reciprocity to perform data scheduling for the UE based on channel information.

[0151] The SRS resources are semi-statically configured by the base station by using higher layer parameters, and include:

[0152] N ap SRS ∈{1,2,4} SRS ports (antenna ports)

number

[0153] N symb SRS ∈{1,2,4,8,10,12,14} consecutive OFDM symbols.

[0154] The time domain start position of the symbol level within a slot is l 0∈{0,1,…,13}.

[0155] The starting frequency domain position is k 0 It is.

[0156] SRS comb: The frequency domain subcarriers on an SRS comb are evenly spaced. Comb number K TC ∈{2,4,8} is semi-statically configured by the base station by using higher layer parameters to determine the number of subcarriers between any two adjacent subcarriers on the comb. Figure 1 shows an example of three combs (also called frequency domain combs) with different comb numbers according to the present application. In Figure 1, each box represents one resource element (RE) in the frequency domain, and the black boxes are examples of RE positions occupied by one comb in different comb numbers.

[0157] 2. SRS Scanning Bandwidth and Frequency Hopping Bandwidth

[0158] The SRS scanning bandwidth and frequency hopping bandwidth, as well as the frequency hopping period, are determined based on higher layer parameters and predefined tables in the protocol. F When the base station does not configure the frequency scaling factor P using higher layer parameters, the SRS scanning bandwidth is a bandwidth range corresponding to the channels acquired by the base station based on the SRS. The frequency hopping bandwidth is a bandwidth range corresponding to the channels acquired by the base station after a single SRS transmission, the frequency hopping bandwidth is equal to or smaller than the scanning bandwidth, and the frequency hopping period is the number of SRS transmissions required when the base station acquires the channel corresponding to the scanning bandwidth. Alternatively, the base station may use higher layer parameters to configure the frequency scaling factor P F When configuring the SRS, the SRS scanning bandwidth and frequency hopping bandwidth and frequency hopping period remain unchanged. However, the bandwidth for a single SRS transmission is 1 / P of the original bandwidth. FIn this case, the scanning bandwidth is P of the bandwidth range corresponding to the channel acquired by the base station based on the SRS. F , and the SRS frequency hopping bandwidth is P of the bandwidth range corresponding to the channel acquired by the base station after a single SRS transmission. F FIG. 2 shows an example of both the scanning bandwidth and the frequency hopping bandwidth according to the present application. In FIG. 2, each box represents one resource block (RB) in the frequency domain, the SRS scanning bandwidth is 16 RBs, the frequency hopping bandwidth is 4 RBs, and the frequency hopping period is 4. In the left diagram, P F is not configured, and in the figure on the right, P F =2 is configured.

[0159] 3. SRS cyclic shift (CS)

[0160] The sequence r used by LTE and NR SRS u,v (α,δ) (n) is the base sequence (r with a bar u,v (n) is a cyclic shift of

number

[0161] where α is the cyclic shift value, a real number; δ=log 2 (K TC ), which are integers; u and v are the indices of the base sequences in the SRS base sequence group, which are integers; j is the imaginary unit; M ZC where n is the length of the SRS sequence, a positive integer; n is the index of the elements in the SRS sequence, an integer. The sequence elements are mapped sequentially to the subcarriers in ascending order of subcarrier index, corresponding to the SRS resources, in ascending index order.

[0162] SRS Port p iThe corresponding cyclic shift α i is defined according to the following formula:

number

[0163] where n SRS cs,max is the maximum cyclic shift value, and K TC are defined separately based on the value of . See Table 1. [Table 1]

[0164] n SRS cs,max The meaning of is to set the delay domain to n SRS cs,max This may be understood as dividing the phase value 2π equally into n parts, or SRS cs,max Each cyclic shift value corresponds to the start of a respective portion. SRS cs ∈{0,1,…,n SRS cs,max −1} is a cyclic shift reference value, which is semi-statically configured by the base station by using the higher layer parameter transmissionComb.

[0165] For the same base sequence, different SRS sequences may be obtained by using different cyclic shift values ​​α. 1 and α 2 is α 1 mod 2π ≠ α 2 mod 2π, the basic sequence [r u,v (n)] and the cyclic shift α 1 The sequences obtained using are mutually orthogonal, i.e., the cross-correlation coefficient is zero. 1 (m) and s 2 The cross-correlation coefficient for (m), m=0,1,…,M-1 is

number

[0166] According to equations (1) and (2), the number of SRS ports = 2, and n SRS cs,max When = 8, the difference between the CS corresponding to the two ports is 4. The specific occupied CS value is n SRS cs The number of SRS ports is determined by the configuration of SRS cs,max When N = 12, the difference between the CS corresponding to the two ports is 3. ap SRS = 4, n SRS cs,max Except for the case of =6, this allocation scheme allows the spacing between the CS values ​​corresponding to two ports within one SRS resource to be as large as possible.

[0167] 4. Comb Allocation for SRS Ports

[0168] SRS Port p i Frequency domain start position k 0 (pi) is defined according to the following formula:

[0169]

number

[0170] Frequency hopping offset n offset FH and some probe offset noffset RPFS , n shift , and k offset l' The calculation formula is not relevant to the present application and will not be described in detail here.

[0171] SRS Port p i Comb k occupied by TC (pi) is defined according to the following formula:

number

[0172] Here, k with bar TC ∈{0,1,…,K TC -1} is the comb offset and is configured by the base station by using the higher layer parameter transmissionComb.

[0173] From the above equation (7), N ap SRS = 4, and n SRS cs,max When n ≠ 6, whether each port of an SRS resource occupies two combs or one comb depends on n SRS cs For example, n SRS cs ∈{n SRS cs,max / 2,…,n SRS cs,max -1}, the comb occupied by ports 1001 and 1003 is different from the comb occupied by ports 1000 and 1002. As another example, SRS cs ∈{0,…, n SRS cs,max / 2-1}, the comb occupied by ports 1001 and 1003 is the same as the comb occupied by ports 1000 and 1002.

[0174] 5. Codebook-based PUSCH transmission

[0175] In the codebook-based PUSCH transmission, the phase (TPMI) and the quantity of the transport stream of each transmit antenna used by the terminal device to transmit the PUSCH need to be indicated. Each transmit antenna used by the terminal device to transmit the PUSCH has a one-to-one correspondence with each port of the SRS resource corresponding to the PUSCH. The precoding indication information for the access network device to schedule the PUSCH includes an SRI, a TRI, and the TPMI. The SRI indicates the SRS resource corresponding to the PUSCH (used to determine the transmit antenna for transmitting the PUSCH), the TRI indicates the transport stream of the PUSCH, and the TPMI indicates the transmit phase of the transmit antenna corresponding to the PUSCH. The PUSCH transmission scheme defined in the existing protocol is as follows: y=[y (0) (i)y (1) (i)...y (v-1) (i)] T , where i=0,1,…,M symb layer -1, M symb layer represents the number of modulation symbols in the transport layer, v is the number of transport streams of the PUSCH, and y is the i-th modulation symbol mapped to the k-th stream, k = 0, ..., v-1. y is the modulation symbol assigned to the transmit antenna ({p 0 ,p 1 ,…,p ρ-1}, where the physical meaning is each SRS port in the SRS resource corresponding to the PUSCH). The data transmitted on each transmit antenna is z. The formula for mapping y to the transmit antenna corresponding to the PUSCH based on the precoding matrix W is as follows:

number

[0176] Here, z (p0)(i) is the transmitting antenna p 0 This indicates the data sent on the

[0177] In codebook-based PUSCH transmission, the SRI typically indicates one SRS resource, the number of rows in the TPMI is the number of SRS ports in the SRS resource, and the rows have a one-to-one correspondence with the SRS ports.

[0178] In the following, we describe the current solution of allocating a comb and a CS to each port of one SRS resource.

[0179] Currently, both the combs and CSs assigned to the SRS ports in an SRS resource are for the case where there are a maximum of four ports. For example, in a four-port SRS resource (i.e., an SRS resource that includes four ports), TC When n = 2, SRS cs It is supported to use ∑ i = 1 ∑ s = 0 ∑ s ... SRS cs,max ×2 / 4-1=3. Ports 1001 and 1003 are classified into different combs, and the corresponding CS interval is also n SRS cs,max×2 / 4-1=3. Here, the CS interval between two ports refers to the number of integers between the CS values ​​corresponding to the two ports. When the SRS resource occupies one comb, the CS interval between adjacent ports is n SRS cs,max / 4-1=1, i.e., in a 4-port SRS resource, there are two configurable CS intervals, 1 and 3.

[0180] In a two-port SRS resource (i.e., one SRS resource containing two ports), TC When = 2, the comb is occupied and the CS spacing between adjacent ports is n SRS cs,max / 2-1=3.

[0181] K TC When = 2, both 2-port SRS resources and 4-port SRS resources support a maximum CS interval of 3. It is not sufficient to support only a CS interval of 1. It is assumed that the number of discrete Fourier transform (DFT) points in the delay domain is N. If the CS interval is 3, it indicates that the DFT point number interval in the delay domain is 3*8 / N. If the CS interval is 1, it indicates that the DFT point number interval in the delay domain is 8 / N.

[0182] K in 4-port SRS resources TC When = 4, if one comb is occupied, the CS spacing between adjacent ports is n SRS cs,max / 4-1=2, and if two combs are occupied, the CS spacing between adjacent ports in the same comb is n SRS cs,max ×2 / 4-1=5.

[0183] In two-port SRS resources, TC When = 4, one comb is occupied and the CS spacing between adjacent ports is n SRS cs,max / 2-1=5.

[0184] K TC It can be seen that when = 4, both 2-port SRS resource and 4-port SRS resource support a maximum CS interval of 5. Supporting only a CS interval of 2 is not enough. It is assumed that the number of DFT points in the delay domain is N. If the CS interval is 5, the DFT point number interval in the delay domain is 5*12 / N. If the CS interval is 2, the DFT point number interval in the delay domain is 2*12 / N.

[0185] K in 4-port SRS resources TC When = 8, only two combs may be occupied, and the CS spacing between adjacent ports in the same comb is n SRS cs,max ×2 / 4-1=2.

[0186] In two-port SRS resources, TC When = 8, only one comb is occupied and the CS spacing between adjacent ports is n SRS cs,max / 2-1=2.

[0187] K TC When = 8, both 2-port SRS resource and 4-port SRS resource support a maximum CS interval of 2. It is assumed that the number of DFT points in the delay domain is N. When the CS interval is 2, it indicates that the DFT point number interval in the delay domain is 2*6 / N.

[0188] K in 8-port SRS resource TC When n = 2, based on the currently used SRS comb structure, only mapping with no CS spacing between adjacent ports is supported when all eight ports are placed in one comb. In this case, the orthogonal performance between ports is lower than that of the existing two-port SRS resource and four-port SRS resource. Alternatively, when the eight ports are evenly placed in two combs, the CS spacing between adjacent ports in one comb is n SRS cs,max×2 / 8-1=1, and the orthogonality level of the existing 2-port SRS resource and 4-port SRS resource cannot be reached. In order to ensure the signal quality of the SRS transmitted by the terminal device, a time-frequency mapping solution of the SRS resource that enables strong orthogonality between SRS ports needs to be studied. This application provides a time-frequency mapping solution for 8-port SRS resource, so that the orthogonality between ports can reach the orthogonal level of the existing 2-port SRS resource and 4-port SRS resource.

[0189] Currently, all ports in one SRS resource are mapped to the same OFDM symbol. In a power-limited scenario, the total transmission power of the SRS on one OFDM symbol is limited. As a result, the transmission power of each SRS port may not meet the demodulation performance requirement. Figure 3 is a diagram of a comparison between transmission powers according to an embodiment of the present application. As shown in Figure 3, it is assumed that Pcmax = 23 dBm (i.e., the total transmission power is 23 dBm). For a 4-port SRS resource (having port 0 to port 4), the maximum transmission power corresponding to each SRS port (port 0, 1, 2, 3) is 17 dBm. However, for an 8-port SRS resource (having port 0 to port 8), the maximum transmission power corresponding to each SRS port is only 14 dBm, and each SRS port has a power loss of 3 dB. Therefore, a time-frequency mapping solution in which the transmission power of each port is high when the SRS resource includes a large number of ports (e.g., 8 ports) needs to be studied.

[0190] In some communication methods provided in this application, a novel time-frequency resource mapping solution for SRS resources is used to enable strong orthogonality between ports and / or high transmit power for each port.

[0191] The communication method provided in the present application is applicable to both homogeneous and heterogeneous network scenarios, there is no restriction on the transmission point, and the coordinated multi-point transmission may be performed between macro base stations, between micro base stations, or between a macro base station and a micro base station, and is applicable to FDD / TDD systems. The communication method, communication method, and communication method provided in the present application are applicable to low frequency scenarios (below 6G), high frequency scenarios (above 6G), single transmission reception point (TRP) scenarios, or multiple transmission reception point (multi-TRP) scenarios, and any of their derived scenarios. The communication method provided in the present application is applied to wireless communication systems such as 5G communication systems, satellite communication systems, and short-range communication systems.

[0192] It should be noted that the wireless communication systems referred to in the embodiments of the present application include, but are not limited to, narrow band-internet of things (NB-IoT) systems, and 4th generation (4G) communication systems such as long term evolution (LTE) systems, non-terrestrial network (NTN) systems such as satellite communication systems, 5th generation (5G) communication systems, or new radio (NR) systems, communication systems evolved after 5G such as 6G, wireless fidelity (Wi-Fi) systems, and communication systems supporting the integration of multiple wireless technologies.

[0193] In the following, we first describe some examples of communication systems to which the communication solutions provided herein can be applied.

[0194] FIG. 4 illustrates an example of a wireless communication system according to an embodiment of the present application. As illustrated in FIG. 4, the communication system includes one or more terminal devices (in FIG. 4, only two terminal devices are used as an example); and one or more access network devices (e.g., base stations) that can provide communication services for the terminal devices (in FIG. 4, only one access network device is used as an example). In some embodiments, the wireless communication system may include cells, each cell including one or more access network devices, and the access network devices provide communication services for multiple terminals. The wireless communication system may perform point-to-point communication, for example, multiple terminals communicate with each other.

[0195] A terminal is a device that has radio transceiver capabilities. A terminal can communicate with one or more core network (CN) devices (also called core devices) through access network devices (also called access devices) in a radio access network (RAN). A terminal may be an indoor device, an outdoor device, a handheld device, or a vehicle-mounted device, and may be deployed on land, on water (e.g., on a ship), or in the air (e.g., on an airplane, balloon, or satellite). In the embodiments of the present application, the terminal may be referred to as a terminal device or user equipment (UE), and may be a mobile phone, a mobile station (MS), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self driving, a wireless terminal device in telemedicine, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal in a smart home, a subscriber unit, a cellular phone, a wireless data card, a personal digital assistant (PDA) computer, a tablet computer, a laptop computer, a machine type communication (MTC) terminal, etc.The terminal may include various handheld devices, in-vehicle devices, wearable devices, or computing devices with wireless communication capabilities, or other processing devices connected to a wireless modem. Optionally, the terminal may be a handheld device (handset), in-vehicle device, wearable device, or a terminal in the Internet of Things or Internet of Vehicles, any form of terminal in 5G and 5G and beyond evolved communication systems, etc. This is not limited in the present application.

[0196] The access network device may be any device that has a radio transceiver function and can communicate with a terminal, for example, a radio access network (RAN) node that enables the terminal to access a wireless network. Currently, some examples of RAN nodes include macro base stations, micro base stations (also called small cells), relay stations, access points, gNBs, transmission reception points (TRPs), evolved NodeBs (eNBs), radio network controllers (RNCs), home base stations (e.g., home evolved NodeBs, or home NodeBs, HNBs), base band units (BBUs), Wi-Fi access points (APs), integrated access and backhauls (IABs), etc.

[0197] The following first describes a communication method provided in an embodiment of the present application with reference to the accompanying drawings.

[0198] 5 is an interactive flowchart of a communication method according to an embodiment of the present application. As shown in FIG. 5, the method includes the following steps:

[0199] 501: A terminal device transmits an uplink reference signal to an access network device based on a transmission pattern.

[0200] In response, the access network device receives an uplink reference signal from the terminal device.

[0201] The uplink reference signal resource of the uplink reference signal includes N ports, and the N ports have at least two port groups in the transmission pattern, each port group corresponds to the same time-frequency resource, and different port groups correspond to different time-frequency resources, and the N ports in the transmission pattern are carried on two or more OFDM symbols. For example, N is 8, and the 8 ports in the transmission pattern are carried on two OFDM symbols. Alternatively, the N ports in the transmission pattern are carried on two or more frequency domain combs and one OFDM symbol, and N is an integer greater than 4. For example, N is 8.

[0202] In one possible implementation, step 501 is replaced as follows: the terminal device transmits an uplink reference signal according to the configuration information and the transmission pattern, and the configuration information indicates to the terminal device that the uplink reference signal is transmitted according to the transmission pattern. In other words, the time-frequency resource mapping scheme of the N ports included in the uplink signal resource is the same as the time-frequency resource mapping scheme of the N ports in the transmission pattern.

[0203] In one possible implementation, N is 8, and the N ports in the transmit pattern (shown) are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 2, where two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports in the transmit pattern (shown) are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 2, where four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmit pattern (shown) are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 2, where four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or

[0204] In this implementation, the manner in which the N ports in the transmit pattern are carried on frequency domain combs and OFDM symbols can enable strong orthogonality between the ports.

[0205] 502: The terminal device receives precoding indication information from the access network device.

[0206] Correspondingly, the access network device transmits pre-coding indication information to the terminal device. Optionally, the pre-coding indication information is obtained by the access network device based on the uplink reference signal. Optionally, the transmit antennas for transmitting the uplink data correspond to ports in the multiple uplink reference signals.

[0207] The pre-coding indication information indicates a pre-coding for transmitting uplink data, and the pre-coding indication information is obtained by the access network device based on the uplink reference signal, and the rows of the matrix corresponding to the pre-coding are in one-to-one correspondence with the N ports. For example, the pre-coding corresponds to a matrix having eight rows, and the rows of the matrix are in one-to-one correspondence with the N ports included in the uplink reference signal resource. For example, the pre-coding corresponds to two matrices having four rows, and the rows of the two matrices are in one-to-one correspondence with the eight ports included in the uplink reference signal resource. For example, the pre-coding corresponds to four matrices having two rows, and the rows of the four matrices are in one-to-one correspondence with the eight ports included in the uplink reference signal resource.

[0208] 503: The terminal device maps the uplink data to an antenna port based on the precoding.

[0209] In response, the access network device receives uplink data from the terminal device.

[0210] In one possible implementation, the uplink reference signal is an SRS, the uplink reference signal resource is an SRS resource, the uplink data is carried on a PUSCH or a PUCCH, N is 8, the number of antenna ports is the same as the number of ports in the SRS resource, and the antenna ports have a one-to-one correspondence with the ports in the SRS resource. The terminal device's mapping of the uplink data to the antenna ports based on the precoding may be as follows: The terminal device maps the uplink data to the antenna ports based on the precoding according to Equation (8). In Equation (8), W represents a matrix corresponding to the precoding, z represents data transmitted on each antenna port, and y is the uplink data.

[0211] In one possible implementation, the transmit power of the uplink reference signal is determined based on a transmit pattern, and the transmit pattern is symb SRSWhen we show that the 1000 MHz signal is carried on 1000 MHz (for example, 2) OFDM symbols, the maximum transmit power of each port is P CMAX ×N symb SRS / N ap SRS Not to exceed P CMAX is the maximum transmit power configured for the terminal device, and N symb SRS is an integer greater than 1, and N ap SRS is equal to N. Optionally, the total SRS transmit power determined by using a power control strategy is evenly allocated to the SRS ports corresponding to the OFDM symbols. In this way, the actual transmit power of the SRS corresponding to the 8-port SRS resource is equal to N of the total transmit power. symb SRS In this implementation, N ports can be symb SRS OFDM symbols, so that the actual transmission power of the SRS corresponding to the SRS resource is N symb SRS This improves the accuracy of the channel measurement.

[0212] In one possible implementation, an 8-port SRS is configured in an SRS resource set for transmitting an uplink codebook. The terminal device transmits the 8-port SRS. The access network device determines channel information of each transmit antenna of the terminal device based on the 8-port SRS, and then indicates a TPMI based on the 8-port SRS. The TPMI is in the form of a matrix, the number of rows of the matrix is ​​8 (determined based on the number of corresponding SRS ports), and the rows correspond to SRS ports. The transmit antennas of the terminal device corresponding to the SRS ports are used to transmit PUSCH, and the transmit phases of the transmit antennas corresponding to each SRS port are determined based on each row in the TPMI. In this implementation, the transmit phases of the transmit antennas corresponding to each SRS port of the 8-port SRS can be accurately determined.

[0213] In this embodiment of the present application, the terminal device transmits an uplink reference signal to the access network device based on a transmission pattern, so that N (greater than 4) ports included in the uplink reference signal resource of the uplink reference signal are carried on two or more OFDM symbols. The N ports included in the same uplink reference signal resource are carried on two or more OFDM symbols, which can improve the orthogonality between ports in the N ports. The terminal device transmits an uplink reference signal to the access network device based on a transmission pattern, so that N (greater than 4) ports included in the uplink reference signal resource of the uplink reference signal are carried on two or more frequency domain combs and one OFDM symbol. The pre-coding indication information indicates that the rows of the matrix corresponding to the pre-coding for transmitting the uplink data of the terminal device have a one-to-one correspondence with the N ports included in the uplink reference signal resource. This provides a solution of using an uplink reference signal resource including N ports to carry the uplink reference signal, and supports SRS resource design in a scenario where there is a large number of SRS ports.

[0214] The N ports included in the uplink reference signal resource may be carried on frequency domain combs with different comb numbers. When frequency domain combs with different comb numbers are used to carry the N ports included in the uplink reference signal resource, the terminal device transmits the uplink reference signal to the access network device based on different transmission patterns. In this application, the frequency domain comb number and the comb number can be interchangeable. In the following, the signal transmission solutions when the terminal device uses frequency domain combs with comb numbers 2, 4, and 8 to carry the SRS ports are separately described.

[0215] FIG. 6 is an interactive flowchart of another communication method according to an embodiment of the present application. FIG. 6 illustrates a signal transmission solution when a terminal device uses a frequency domain comb with a comb number of 2 to carry an SRS port. The method steps in FIG. 6 are possible implementations of the method described in FIG. 5. In this implementation, the terminal device may select a transmission pattern from two or more patterns to obtain a transmission pattern suitable for transmitting an uplink reference signal. As shown in FIG. 6, the method includes the following steps:

[0216] 601: A terminal device determines a transmission pattern from two or more patterns according to a CS reference value indicator of an uplink reference signal included in the configuration information of an uplink reference signal resource, wherein the comb number corresponding to the two or more patterns is 2.

[0217] The uplink reference signal resource is an SRS resource, and the uplink reference signal is an SRS. The N ports in the transmission pattern correspond to different time-frequency resources. The N ports in the transmission pattern are carried on two or more OFDM symbols. Alternatively, the N ports in the transmission pattern are carried on two or more frequency-domain combs and one OFDM symbol, where N is an integer greater than 4. For example, N is 8. Example 1: The N ports in the transmission pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 2, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different cyclic shift CS values. Example 2: The N ports in the transmission pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 2, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. Example 3: N ports in a transmission pattern are carried on two frequency-domain combs with a frequency-domain comb number of 2 and one OFDM symbol, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. It should be understood that when a terminal device uses a frequency-domain comb with a comb number of 2 to carry SRS ports, the time-frequency resource mapping scheme corresponding to the transmission pattern can be one of the following: frequency division mapping mode (corresponding to example 3) in which two combs + four CSs are assigned to eight ports; frequency division + time division mapping mode 1 (corresponding to example 1) in which two combs + two OFDM symbols + two CSs are assigned to eight ports, and frequency division + time division mapping mode 2 (corresponding to example 2) in which one comb + two OFDM symbols + four CSs are assigned to eight ports.

[0218] In one possible implementation, the configuration information may include a comb position indicator for the uplink reference signal.

number

[0219] In the first pattern (corresponding to example 1), the comb corresponding to the first set of N ports is

number

number

[0220] In the second pattern (corresponding to example 2), the combs corresponding to the first and second port sets of N ports are

number

[0221] In the third pattern (corresponding to example 3), the comb corresponding to the first set of N ports is

number

number

[0222] The ports included in the first port set are different from the ports included in the second port set.

[0223] In one possible implementation, the first pattern, the second pattern, and the third pattern each include 8 ports, the first port set is {1, 3, 5, 7}, and the second port set is {0, 2, 4, 6}. Port 0 to port 7 refer to port 1000 to port 1007. That is, port 0 refers to port 1000, port 1 refers to port 1001, and so on. FIG. 7 shows an example of the first pattern, the second pattern, and the third pattern according to this embodiment of the present invention. As shown in FIG. 7, 701 represents the first pattern, 702 represents the second pattern, and 703 represents the third pattern, and the rectangular frames with different shading belong to different combs. The comb corresponding to the first port set in the first pattern is 1 (i.e.,

number

number

number

number

number

[0224] It should be understood that the port numbers included in the port set are merely examples, and different port sets may further include other combinations of port numbers.

[0225] One possible implementation of step 601 is as follows: SRS cs ), the terminal device uses the third pattern among the second pattern and the third pattern as the transmission pattern; or, when the CS reference value indicator is included in the second set, the terminal device determines the second pattern among the second pattern and the third pattern as the transmission pattern, where the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max In the second pattern, the combs corresponding to the first and second port sets of N ports are

number

number

number

[0226] A formula corresponding to said possible implementation of step 601 is as follows:

[0227]

number

[0228] Here, i represents the index of port i, and l with a bar 0 represents the index of the OFDM symbol, and l 0 and (l 0 +1) represent the indices of two different OFDM symbols. Equation (9) shows the third pattern, and equations (10) and (11) show the second pattern.

[0229] In one implementation, n SRS cs The correspondence between the value ranges of and the patterns is not limited to the above examples.

[0230] Another possible implementation of step 601 is as follows: SRS cs) is included in the first set, the terminal device determines the third pattern of the first pattern and the third pattern as the transmission pattern; or, when the CS reference value indicator is included in the second set, the terminal device determines the first pattern of the first pattern and the third pattern as the transmission pattern, where the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max In the first pattern, the comb corresponding to the first set of N ports is

number

number

[0231]

number

[0232] Here, i represents the index of port i, and l with a bar 0 represents the index of the OFDM symbol. Equation (12) represents the third pattern, and equations (13) and (14) represent the first pattern. In one implementation, n SRS csThe correspondence between the value ranges of and the patterns is not limited to the above examples.

[0233] Step 601 is a step in which a terminal device receives a CS reference value indicator n of an uplink reference signal included in the configuration information of the uplink reference signal resource. SRS cs and the number of symbols N symb SRS Here, the comb number corresponding to the two or more patterns is 2. For example, n SRS cs is in the first set, and N symb SRS is equal to 1, the third pattern among the first pattern, the second pattern, and the third pattern is used as the transmission pattern; SRS cs is in the first set, and N symb SRS is greater than 1, the second pattern of the first pattern, the second pattern, and the third pattern is used as the transmission pattern; or n SRS cs is in the second set, and N symb SRS If is greater than 1, a first pattern among the first pattern, the second pattern, and the third pattern is used as the transmission pattern.

[0234] 602: The terminal device transmits an uplink reference signal to the access network device based on the transmission pattern.

[0235] For step 602, please refer to step 501.

[0236] 603: The terminal device receives precoding indication information from the access network device.

[0237] For step 603, please refer to step 502.

[0238] 604: The terminal device maps the uplink data to an antenna port based on the precoding.

[0239] For step 604, please refer to step 503.

[0240] In this embodiment of the present application, the access network device can flexibly configure the transmission pattern based on the channel condition of the terminal device. Specifically, when the uplink transmission power of the terminal device is limited, a transmission pattern occupying multiple OFDM symbols may be configured. However, when the base station has high requirements for the phase accuracy of the terminal device, a transmission pattern occupying one OFDM symbol may be configured. This can also simplify the configuration signaling design by switching the transmission pattern based on the redundant information in the CS reference value indicator.

[0241] FIG. 8 is an interactive flowchart of another communication method according to an embodiment of the present application. FIG. 8 illustrates a case in which a terminal device uses a comb number of 4 (i.e., K TC 8 shows a signal transmission solution when using a frequency domain comb (where r is 4). The method steps in FIG. 8 are possible implementations of the method described in FIG. 5. In this implementation, the terminal device may select a transmission pattern from two or more patterns to obtain a transmission pattern suitable for transmitting an uplink reference signal. As shown in FIG. 8, the method includes the following steps:

[0242] 801: A terminal device determines a transmission pattern from two or more patterns according to a CS reference value indicator of an uplink reference signal included in configuration information of an uplink reference signal resource, where a comb number corresponding to the two or more patterns is 4.

[0243] For step 801, refer to step 501. Possible Scheme 1: N ports in the transmission pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values. Possible Scheme 2: N ports in the transmission pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. Possible Scheme 3: N ports in the transmission pattern are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. Possible Scheme 4: N ports in the transmission pattern are carried on 4 frequency-domain combs with a frequency-domain comb number of 4 and 1 OFDM symbol, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values. The time-frequency resource mapping scheme corresponding to the transmission pattern can be any one of the following: Frequency Division Mapping Mode 1: 2 combs + 4 CSs (Scheme 3), Frequency Division Mapping Mode 2: 4 combs + 2 CSs (Scheme 4), Frequency Division + Time-Frequency Mapping Mode 1: 2 combs + 2 OFDM symbols + 2 CSs (Scheme 1), and Frequency Division + Time-Frequency Mapping Mode 2: 2 OFDM symbols + 4 CSs (Scheme 2).

[0244] In one possible implementation, the configuration information includes a comb position indicator

number

[0245] In the first pattern (corresponding to scheme 1), the comb corresponding to the first set of N ports is

number

number

[0246] In the second pattern (corresponding to scheme 2), the combs corresponding to the first and second port sets of N ports are

number

[0247] In the third pattern (corresponding to scheme 3), the comb corresponding to the first set of N ports is

number

number

[0248] In the fourth pattern (corresponding to method 4), the combs corresponding to the four port sets of N ports are

number

[0249] The ports included in the first port set are different from the ports included in the second port set.

[0250] In one possible implementation, the first pattern, the second pattern, the third pattern, and the fourth pattern each include eight ports, the first port set is {1,3,5,7}, the second port set is {0,2,4,6}, and the four port sets included in the fourth pattern are {0,4}, {2,6}, {1,5}, and {3,7}. Port 0 to port 7 refer to port 1000 to port 1007. That is, port 0 refers to port 1000, port 1 refers to port 1001, and so on. Figure 9 shows examples of the first pattern, the second pattern, the third pattern, and the fourth pattern in this embodiment of the present application. As shown in Figure 9, 901 represents the first pattern, 902 represents the second pattern, 903 represents the third pattern, and 904 represents the fourth pattern, and the rectangular frames with different shading belong to different combs. The comb corresponding to the first set of ports in the first pattern is 2 (i.e.,

number

number

number

number

number

number

[0251] One possible implementation of step 801 is as follows: SRS cs) is included in the first set, the terminal device uses the third pattern in the second pattern and the third pattern as the transmission pattern; or when the CS reference value indicator is included in the second set, the terminal device uses the second pattern in the second pattern and the third pattern as the transmission pattern, where the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0252] Another possible implementation of step 801 is as follows: SRS cs ) is included in the first set, the terminal device uses the third pattern of the first pattern and the third pattern as the transmission pattern; or, when the CS reference value indicator is included in the second set, the terminal device uses the first pattern of the first pattern and the third pattern as the transmission pattern, where the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0253] Another possible implementation of step 801 is as follows: SRS cs) is included in the first set, the terminal device uses a first pattern among the first pattern and the second pattern as the transmission pattern; or when the CS reference value indicator is included in the second set, the terminal device uses a second pattern among the first pattern and the second pattern as the transmission pattern, where the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0254] Another possible implementation of step 801 is as follows: SRS cs ), the terminal device uses the third pattern among the third pattern and the fourth pattern as the transmission pattern; or, when the CS reference value indicator is included in the second set, the terminal device uses the fourth pattern among the third pattern and the fourth pattern as the transmission pattern, where the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0255] Another possible implementation of step 801 is as follows: SRS csWhen the CS reference value indicator is included in the first set, the terminal device uses the first pattern of the first pattern and the fourth pattern as the transmission pattern. Or, when the CS reference value indicator is included in the second set, the terminal device uses the fourth pattern of the first pattern and the fourth pattern as the transmission pattern. Here, the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0256] Another possible implementation of step 801 is as follows: SRS cs When the first set includes {0, ..., n}, the terminal device uses the second pattern of the second pattern and the fourth pattern as the transmission pattern. Or, when the CS reference value indicator is included in the second set, the terminal device uses the fourth pattern of the second pattern and the fourth pattern as the transmission pattern. Here, the first set is {0, ..., n} SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0257] Another possible implementation of step 801 is as follows: The terminal device determines whether the CS reference value indicator, the maximum CS indicator N ap SRS , and the number of symbols N symb SRSThe terminal device determines the transmission pattern from two or more patterns based on the N number of symbols, the two or more patterns including at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern, and the number of symbols indicates the number of OFDM symbols carrying the N ports. For example, the terminal device determines the transmission pattern from a first pattern, a second pattern, a third pattern, and a fourth pattern based on a CS reference value indicator, a maximum CS indicator, and a number of symbols included in the configuration information of the uplink reference signal resource. A formula corresponding to this implementation is as follows:

[0258]

number

[0259] Here, i represents the index of port i, and l with a bar 0 represents the index of the OFDM symbol. Equation (15) represents the third pattern, equation (16) represents the fourth pattern, equations (17) and (18) represent the first pattern, and equations (19) and (20) represent the second pattern. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator. In one implementation, n SRS cs The correspondence between the value ranges of and the patterns is not limited to the above examples.

[0260] 802: The terminal device transmits an uplink reference signal to the access network device based on the transmission pattern.

[0261] For step 802, please refer to step 501.

[0262] 803: The terminal device receives precoding indication information from the access network device.

[0263] For step 803, please refer to step 502.

[0264] 804: The terminal device maps the uplink data to an antenna port based on the precoding.

[0265] For step 804, please refer to step 503.

[0266] In this embodiment of the present application, the access network device can flexibly configure a transmission pattern based on the channel state of the terminal device. Specifically, when the uplink transmission power of the terminal device is limited, a transmission pattern occupying multiple OFDM symbols may be configured. However, when the base station has a high requirement for the phase accuracy of the terminal device, a transmission pattern occupying one OFDM symbol may be configured.

[0267] FIG. 10 is an interactive flowchart of another communication method according to an embodiment of the present application. FIG. 10 illustrates a case where the terminal device has a comb number of 8 (i.e., K TC 10 shows a signal transmission solution when using a frequency domain comb (where r is 8). The method steps in FIG. 10 are possible implementations of the method described in FIG. 5. In this implementation, the terminal device may select a transmission pattern from two or more patterns to obtain a transmission pattern suitable for transmitting an uplink reference signal. As shown in FIG. 10, the method includes the following steps:

[0268] 1001: A terminal device determines a transmission pattern from two or more patterns according to a CS reference value indicator of an uplink reference signal included in configuration information of an uplink reference signal resource, where a comb number corresponding to the two or more patterns is 8.

[0269] For step 1001, refer to step 501. Possible Scheme 5: N ports in the transmission pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 8, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values. Possible Scheme 6: N ports in the transmission pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. Possible Scheme 7: N ports in the transmission pattern are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values. Possible Scheme 8: N ports in the transmission pattern are carried on 4 frequency-domain combs with a frequency-domain comb number of 8 and 1 OFDM symbol, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values. The time-frequency resource mapping scheme corresponding to the transmission pattern can be any one of the following: Frequency Division Mapping Mode 1: 2 combs + 4 CSs (Scheme 7), Frequency Division Mapping Mode 2: 4 combs + 2 CSs (Scheme 8), Frequency Division + Time-Frequency Mapping Mode 1: 2 combs + 2 OFDM symbols + 2 CSs (Scheme 5), and Frequency Division + Time-Frequency Mapping Mode 2: 2 OFDM symbols + 4 CSs (Scheme 6).

[0270] In one possible implementation, the configuration information includes a comb position indicator

number

[0271] In the first pattern (corresponding to scheme 5), the comb corresponding to the first set of N ports is

number

number

[0272] In the second pattern (corresponding to method 6), the combs corresponding to the first and second port sets of N ports are

number

[0273] In the third pattern (corresponding to method 7), the comb corresponding to the first set of N ports is

number

number

[0274] In the fourth pattern (corresponding to method 8), the combs corresponding to the four port sets of N ports are

number

[0275] The ports included in the first port set are different from the ports included in the second port set.

[0276] In one possible implementation, the first pattern, the second pattern, the third pattern, and the fourth pattern each include eight ports, the first port set is {1,3,5,7}, the second port set is {0,2,4,6}, the third port set is {0,1,3,4}, the second port set is {2,3,5,6}, and the four port sets included in the fourth pattern are {0,4}, {2,6}, {1,5}, and {3,7}. Port 0 to port 7 refer to port 1000 to port 1007. That is, port 0 refers to port 1000, port 1 refers to port 1001, and so on. FIG. 11 shows examples of the first pattern, the second pattern, the third pattern, and the fourth pattern according to this embodiment of the present application. As shown in Figure 11, 1101 represents the first pattern, 1102 represents the second pattern, 1103 represents the third pattern, and 1104 represents the fourth pattern, and rectangular frames with different shading belong to different combs. The comb corresponding to the first set of ports in the first pattern is 4 (i.e.,

number

number

number

number

number

number

[0277] One possible implementation of step 1001 is as follows: SRS csWhen the CS reference value indicator is included in the first set, the terminal device uses the fourth pattern of the first pattern and the fourth pattern as the transmission pattern. Or, when the CS reference value indicator is included in the second set, the terminal device uses the first pattern of the first pattern and the fourth pattern as the transmission pattern. Here, the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0278] Another possible implementation of step 1001 is as follows: SRS cs When the CS reference value indicator is included in the second set, the terminal device uses the third pattern in the second pattern and the third pattern as the transmission pattern. Or, when the CS reference value indicator is included in the second set, the terminal device uses the second pattern in the second pattern and the third pattern as the transmission pattern. Here, the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0279] Another possible implementation of step 1001 is as follows: SRS csWhen the CS reference value indicator is included in the first set, the terminal device uses a first pattern among the first pattern and the second pattern as the transmission pattern. Or, when the CS reference value indicator is included in the second set, the terminal device uses a second pattern among the first pattern and the second pattern as the transmission pattern. Here, the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. The formula corresponding to this possible implementation is:

[0280]

number

[0281] Here, p i represents the index of port i, and l with a bar 0 represents the index of the OFDM symbol. Equation (21) represents the fourth pattern, and equations (22) and (23) represent the first pattern. In one implementation, n SRS cs The correspondence between the value ranges of and the patterns is not limited to the above examples.

[0282] Another possible implementation of step 1001 is as follows: SRS cs When the CS reference value indicator is included in the first set, the terminal device uses the third pattern among the third pattern and the fourth pattern as the transmission pattern. Or, when the CS reference value indicator is included in the second set, the terminal device uses the fourth pattern among the third pattern and the fourth pattern as the transmission pattern. Here, the first set is {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max−1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0283] Another possible implementation of step 1001 is as follows: SRS cs When the first set includes a CS reference value indicator, the terminal device uses a first pattern among the first pattern and the third pattern as the transmission pattern. Or, when the first set includes a CS reference value indicator, the terminal device uses a third pattern among the first pattern and the third pattern as the transmission pattern. Here, the first set includes {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0284] Another possible implementation of step 1001 is as follows: SRS cs When the first set includes a CS reference value indicator, the terminal device uses the second pattern of the second pattern and the fourth pattern as the transmission pattern. Or, when the first set includes a CS reference value indicator, the terminal device uses the fourth pattern of the second pattern and the fourth pattern as the transmission pattern. Here, the first set includes {0, ..., n SRS cs,max / 2-1}, and the second set is {n SRS cs,max / 2,…,n SRS cs,max −1}. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator.

[0285] Another possible implementation of step 1001 is as follows: The terminal device determines whether the CS reference value indicator, the maximum CS indicator N ap SRS , and the number of symbols N symb SRS The terminal device determines the transmission pattern from the two or more patterns based on a CS reference value indicator, a maximum CS indicator, and a number of symbols, which are included in the configuration information of the uplink reference signal resource. The two or more patterns include at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern, and the number of symbols indicates the number of OFDM symbols carrying the N ports. For example, the terminal device determines the transmission pattern from the first pattern, the second pattern, the third pattern, and the fourth pattern based on a CS reference value indicator, a maximum CS indicator, and a number of symbols, which are included in the configuration information of the uplink reference signal resource. The formula corresponding to this implementation is as follows:

[0286]

number

[0287] Here, p i represents the index of port i, and l with a bar 0 where n represents the index of the OFDM symbol. Equation (24) represents the fourth pattern, equation (25) represents the third pattern, equations (26) and (27) represent the first pattern, and equations (28) and (29) represent the second pattern. This can simplify the configuration signaling design by switching the transmission pattern based on redundant information in the CS reference value indicator. In one implementation, n SRS csThe correspondence between the value range of and the patterns is not limited to the above examples. The present application provides several first patterns, second patterns, third patterns, and fourth patterns corresponding to different comb numbers. The comb number corresponding to the first pattern, second pattern, and third pattern in the method steps of FIG. 6 is 2. The comb number corresponding to the first pattern, second pattern, third pattern, and fourth pattern in the method steps of FIG. 8 is 4. The comb number corresponding to the first pattern, second pattern, third pattern, and fourth pattern in the method steps of FIG. 10 is 8.

[0288] 1002: The terminal device transmits an uplink reference signal to an access network device based on a transmission pattern.

[0289] For step 1002, please refer to step 501.

[0290] 1003: The terminal device receives pre-coding indication information from the access network device.

[0291] For step 1003, please refer to step 502.

[0292] 1004: The terminal device maps the uplink data to an antenna port based on the precoding.

[0293] For step 1004, please refer to step 503.

[0294] In this embodiment of the present application, the access network device can flexibly configure a transmission pattern based on the channel state of the terminal device. Specifically, when the uplink transmission power of the terminal device is limited, a transmission pattern occupying multiple OFDM symbols may be configured. However, when the base station has a high requirement for the phase accuracy of the terminal device, a transmission pattern occupying one OFDM symbol may be configured.

[0295] 12 is an interactive flowchart of another communication method according to an embodiment of the present application. The method steps in FIG. 12 are possible implementations of the method described in FIG. 5. In this implementation, the access network device determines channel information of the transmit antenna of the terminal device based on the 8-port SRS, and then indicates TPMI based on the 8-port SRS. As shown in FIG. 12, the method includes the following steps:

[0296] 1201: A terminal device transmits an uplink reference signal to an access network device based on a transmission pattern.

[0297] Correspondingly, the access network device receives an uplink reference signal from the terminal device. For step 1201, refer to step 501. The uplink reference signal is an 8-port SRS. The 8-port SRS is configured in an SRS resource set for transmitting an uplink codebook. The uplink reference signal resource of the uplink reference signal includes 8 ports.

[0298] 1202: The access network device determines, based on the uplink reference signal, channel information of a transmitting antenna of the terminal device.

[0299] The transmitting antennas of the terminal device correspond to the eight ports included in the uplink reference signal resource.

[0300] 1203: The access network device sends precoding indication information to the terminal device based on the determined channel information of the transmitting antenna of the terminal device.

[0301] The pre-coding indication information indicates pre-coding for transmitting uplink data, and rows of a matrix (sometimes referred to as a pre-coding matrix) corresponding to the pre-coding have a one-to-one correspondence with SRS ports in the uplink reference signal. The transmit antennas of the terminal device corresponding to the SRS ports are used to transmit PUSCH, and the transmit phases of the transmit antennas corresponding to each SRS port are determined based on each row of the matrix. Alternatively, the pre-coding indication information includes a TPMI, the TPMI being in the form of a matrix, the number of rows of the matrix being 8 (determined based on the number of corresponding SRS ports), and the rows of the TPMI have a one-to-one correspondence with SRS ports. The transmit antennas of the terminal device corresponding to the SRS ports are used to transmit PUSCH, and the transmit phases of the transmit antennas corresponding to each SRS port are determined based on each row in the TPMI.

[0302] 1204: The terminal device determines, based on the pre-coding indication information, a transmission phase of a transmitting antenna corresponding to each SRS port.

[0303] 1205: The terminal device maps the uplink data to the antenna ports based on the precoding.

[0304] Correspondingly, the access network device receives uplink data from the terminal device. In this application, the transmit antenna and the antenna port may be interchangeable.

[0305] In this embodiment of the present application, the access network device may determine the channel information of the transmitting antenna of the terminal device according to the uplink reference signal, determine the channel information of the transmitting antenna corresponding to the eight SRS ports, and send the corresponding precoding indication information, so that the signaling overhead is low.

[0306] The above describes a communication solution provided in the present application that can enable strong orthogonality between ports and / or enable high transmission power for each port. The following describes a communication solution provided in the present application that supports a time-frequency mapping solution for 8-port SRS resources. In this solution, the orthogonality between ports can reach the orthogonal level of existing 2-port SRS resources and 4-port SRS resources.

[0307] 13 is an interactive flowchart of another communication method according to an embodiment of the present application. As shown in FIG. 13, the method includes the following steps:

[0308] 1301: A terminal device transmits a plurality of uplink reference signals based on configuration information of a plurality of uplink reference signal resources.

[0309] Correspondingly, the access network device receives a plurality of uplink reference signals from the terminal device.

[0310] 1302: The access network device generates precoding and transport layer number indication information based on a plurality of uplink reference signals.

[0311] The pre-coding and transport layer number indication information indicates a pre-coding and a transport layer number for transmitting uplink data, the pre-coding and transport layer number indication information corresponds to the plurality of uplink reference signals, the transport layer number is equal to or less than the total number of ports included in the plurality of uplink reference signals, the number of rows of a matrix corresponding to the pre-coding is the total number of ports included in the plurality of uplink reference signals, and the rows of the matrix correspond one-to-one to the ports included in the plurality of uplink reference signals. The pre-coding and transport layer number indication information may be referred to as pre-coding indication information. The pre-coding and transport layer number indication information may include a TPMI, and the TPMI indicates a transmission phase of a transmission antenna corresponding to a PUSCH.

[0312] Optionally, the plurality of uplink reference signals are configured for codebook-based uplink transmission.

[0313] Optionally, the precoding and transport layer number indication information is obtained by the access network device based on said uplink reference signal.

[0314] Optionally, a transmit antenna for transmitting uplink data corresponds to a port in the plurality of uplink reference signals.

[0315] Optionally, the pre-coding and transport layer number indication information includes a plurality of first indication information, and the plurality of first indication information has a one-to-one correspondence with the plurality of uplink reference signal resources.

[0316] Optionally, the number of transport layers for uplink data is a sum of the numbers of transport layers indicated in said plurality of first indication information.

[0317] In this embodiment of the present application, an uplink reference signal corresponding to a codebook-based uplink data transmission is carried on the multiple uplink reference signal resources. The method can support flexible resource configuration of the uplink reference signal, as well as a corresponding precoding indication and a corresponding transport layer number indication.

[0318] The time-frequency mapping solution of 8-port SRS resources provided in this application supports 8-port SRS transmission in a manner that supports aggregation of multiple SRS resources. Since the time-frequency resource location of each SRS resource can be independently configured, the 8-port SRS can be divided and transmitted on multiple OFDM symbols. This supports increasing the SRS transmission power and improves the channel measurement accuracy. In this way, the 2-port SRS and 4-port SRS resource designs supported by existing protocols and the design that maximally reuses the existing TPMI codebook can also be used. In this application, the simplified 8-port SRS design is as follows: SRI may indicate multiple SRS resources, the number of rows of TPMI is the sum of all the numbers of ports included in the indicated multiple SRS resources, the F ports included in each SRS resource correspond to the F consecutive rows of TPMI, and the index of the ascending SRS resource corresponds to the ascending row of TPMI. This scheme can reuse the existing 2-port and 4-port SRS resource designs.

[0319] The following describes two possible configuration methods for the 8-port SRS resource.

[0320] Configuration method 1: Four two-port SRS resources are configured. Figure 14 is a diagram of an antenna architecture according to an embodiment of the present application. In Figure 14, SRS resource 1, SRS resource 2, SRS resource 3, and SRS resource 4 are two-port SRS resources, respectively.

[0321] In one possible implementation, each group of dual-polarized antennas of a terminal device corresponds to one two-port SRS resource.

[0322] In one possible implementation, four groups of dual-polarized antennas of a terminal device may perform coherent transmission separately, but the four groups of antennas cannot perform coherent transmission with each other. The terminal device may determine a mapping from streams to ports of SRS resources according to equation (8), where each SRS resource corresponds to an independent layer mapping.

[0323] In one possible implementation, a terminal device receives an SRI transmitted by a base station, the SRI instructing the terminal device to select some or all SRS resources from a plurality of SRS resources configured by the base station, and the four SRS resources are indicated by the SRI.

[0324] In one possible implementation, each 2-port SRS resource corresponds to one precoding indication, and the DCI for scheduling uplink data transmission includes four precoding and transport layer number indication information fields. For the precoding corresponding to the precoding indication in each field, see Tables 2 and 3. Table 2 shows the precoding matrix corresponding to 2-port SRS and one-layer PUSCH transmission. Table 2 shows the precoding matrix corresponding to 2-port SRS and two-layer PUSCH transmission. The number of transport layers for transmitting uplink data is the sum of the number of transport layers indicated by the four fields. [Table 2] [Table 3]

[0325] Configuration method 2: one 4-port SRS resource and two 2-port SRS resources are configured. Figure 15 is a diagram of an antenna architecture according to an embodiment of the present application. In Figure 15, SRS resource 1 is a 4-port SRS resource, and SRS resource 2 and SRS resource 3 are 2-port SRS resources respectively.

[0326] In one possible implementation, two groups of dual-polarized antennas corresponding to a two-port SRS resource of the terminal device may perform coherent transmission separately, and two groups of dual-polarized antennas corresponding to a four-port SRS resource may perform coherent transmission. The terminal device may determine a mapping from layers to ports of each SRS resource according to equation (8), where each SRS resource corresponds to an independent layer mapping.

[0327] In one possible implementation, the terminal device receives an SRI sent by a base station, where the SRI indicates to select some or all SRS resources from a plurality of SRS resources configured by the base station, and three SRS resources are indicated by the SRI.

[0328] In one possible implementation, each SRS resource corresponds to one precoding indication, and the DCI for scheduling uplink data transmission includes three precoding and transport layer number indication information fields. For 2-port SRS resources, see Tables 2 and 3 for precoding corresponding to the precoding indication in each field. For 4-port SRS resources, see Tables 4 to 8 for precoding corresponding to the precoding indication in each field. The number of transport layers for transmitting uplink data is the sum of the number of transport layers indicated by the three fields. Table 4 shows a precoding matrix corresponding to 4-port SRS and 1-layer PUSCH transmission. Table 5 shows a precoding matrix corresponding to 4-port SRS and 1-layer PUSCH transmission. Table 6 shows a precoding matrix corresponding to 4-port SRS and 2-layer PUSCH transmission. Table 7 shows a precoding matrix corresponding to 4-port SRS and 3-layer PUSCH transmission. Table 8 shows a precoding matrix corresponding to 4-port SRS and 4-layer PUSCH transmission. [Table 4] [Table 5] [Table 6] [Table 7] [Table 8]

[0329] The transmitting antenna of the terminal device may also have a single polarization characteristic.

[0330] Configuration Scheme 3: Two 4-port SRS resources are configured. Figure 16 is a diagram of another antenna architecture according to an embodiment of the present application. In Figure 16, SRS resource 1 and SRS resource 2 are 4-port SRS resources, respectively.

[0331] In one possible implementation, each of two groups of dual-polarized antennas of the terminal device corresponds to one four-port SRS resource, and the two groups of dual-polarized antennas of the terminal device and the remaining two groups of dual-polarized antennas cannot perform coherent transmission with each other. The terminal device may determine a mapping from streams to ports of SRS resources according to equation (8), where each SRS resource corresponds to an independent stream and stream mapping.

[0332] In one possible implementation, a terminal device receives an SRI transmitted by a base station, the SRI instructing the terminal device to select some or all SRS resources from a plurality of SRS resources configured by the base station, and the two SRS resources are indicated by the SRI.

[0333] In one possible implementation, each SRS resource corresponds to one precoding indication, and the DCI for scheduling uplink data transmission includes two precoding and transport layer number indication information fields. For the precoding corresponding to the precoding indication in each field, see Tables 3 to 6. The number of transport layers for transmitting uplink data is the sum of the number of transport layers indicated by the two fields.

[0334] In another possible implementation, each group of polarized antennas of the terminal device corresponds to one 4-port SRS resource, i.e., different SRS resources correspond to different polarization directions. The eight transmit antennas of the terminal device have coherent transmission capability, i.e., the terminal device has fully coherent transmission capability.

[0335] In one possible implementation, the pre-coding is a full coherence codeword. Full coherence codeword means that for each layer (each column of the pre-coding matrix), all matrix elements corresponding to the eight ports are non-zero. In one possible implementation, the multiple uplink reference signals are multiple SRSs, the multiple uplink reference signal resources are multiple SRS resources, and the multiple uplink reference signal resources include two first SRS resources, and the first SRS resources include four ports. For example, the two first SRS resources include SRS resource 1 and SRS resource 2, and an antenna port corresponding to the port of SRS resource 1 is in a first polarization direction, and an antenna port corresponding to the port of SRS resource 2 is in a second polarization direction; or for the i-th stream of uplink data transmission, the pre-coding corresponding to the port of SRS resource 1 is v i and the pre-coding corresponding to the port of SRS resource 2 is φ i ×v i and φ i =e jπn / 2 where n is an integer. i The number of elements in is 4, where i is an integer.

[0336] In one possible design, one column of the precoding matrix in Tables 4 to 8 is i may be selected as

[0337] In one possible design, v i is the DFT vector whose number of elements is 4.

[0338] In the present invention, the antennas in one polarization direction are mapped to the same SRS resource, which can ensure that the transmit beams in the two polarization directions are aligned, and only the phase rotation between the polarization directions needs to be indicated, which can reduce the pre-coding indication overhead.

[0339] In one possible implementation, the plurality of uplink reference signals are a plurality of SRSs, and the plurality of uplink reference signal resources are a plurality of SRS resources; the plurality of uplink reference signal resources include two second SRS resources and one first SRS resource, the first SRS resource includes four ports, and the second SRS resource includes two ports; or the plurality of uplink reference signal resources include four second SRS resources, and the second SRS resource includes two ports. For example, the pre-coding is a partial coherence codeword, the uplink reference signal resource is an SRS resource, and the k-th SRS resource of the plurality of SRS resources is a (i 1 k ,…,i mk k )th layer of the precoding 1 k ,…,i mk k The row in which the non-zero element in the )th column is located corresponds one-to-one with the port of the kth SRS resource. kis a positive integer less than or equal to the number of ports in the k-th SRS resource, where k is an integer greater than 0; any two of the plurality of SRS resources correspond to different layers of the uplink data; and the uplink data corresponds to a PUSCH or a PUCCH. Partial coherence means that for each layer (each column of a precoding matrix), only some of the matrix elements corresponding to eight ports are non-zero. That is, each layer of uplink data corresponds to only one SRS resource of the plurality of SRS resources.

[0340] In the present invention, antennas capable of coherent transmission are mapped to the same SRS resource, which can ensure the accuracy of the channel measurement of the coherent antennas by the base station.

[0341] In one possible implementation, the precoding and transport layer number indication information includes a plurality of transport indication fields, the plurality of transport indication fields having a one-to-one correspondence with the plurality of uplink reference signal resources; the rows of a matrix corresponding to the precoding in the plurality of transport indication fields having a one-to-one correspondence with the ports in the corresponding uplink reference signal resources; and the number of transport layers of the uplink data is the sum of the number of transport layers indicated by the plurality of transport indication fields. In this implementation, the rows of a matrix corresponding to the precoding in the plurality of transport indication fields having a one-to-one correspondence with the ports in the corresponding uplink reference signal resources. The terminal device can obtain related information of a plurality of SRS resources for transmitting uplink data on a PUSCH or a PUCCH based on the precoding and transport layer number indication information, and the signaling overhead is low.

[0342] 1303: The access network device sends precoding and transport layer number indication information to the terminal device.

[0343] Correspondingly, the terminal device receives precoding and transport layer number indication information.

[0344] 1304: The terminal device determines, based on the precoding and transport layer number indication information, a phase and a number of transport streams of the transmitting antennas for transmitting the uplink data on the PUSCH.

[0345] 1305: The terminal device maps the uplink data to the antenna ports based on the precoding.

[0346] In response, the access network device receives uplink data from the terminal device.

[0347] In this embodiment of the present application, the access network device transmits precoding and transport layer number indication information to the terminal device. Wherein, the precoding and transport layer number indication information corresponds to multiple uplink reference signals, and it is not necessary to transmit one precoding and transport layer number indication information for each uplink reference signal. This can reduce signaling overhead. Also, the 8-port SRS can be transmitted by aggregating multiple SRS resources. The 8-port SRS can be split and transmitted on multiple OFDM symbols. This can support an increase in SRS transmission power and improve channel measurement accuracy.

[0348] FIG. 17 is a diagram illustrating a structure of a communication device 1700. The communication device 1700 may correspondingly perform the functions or steps performed by the terminal device in the above method embodiments, or may perform the functions or steps performed by the access network device in the above method embodiments. The communication device may include a processing module 1710 and a transceiver module 1720. Optionally, a storage unit may be included. The storage unit may be configured to store instructions (codes or programs) and / or data. The processing module 1710 and the transceiver module 1720 may be coupled to the storage unit. For example, the processing module 1710 may read the instructions (codes or programs) and / or data in the storage unit and perform the corresponding method. The above units may be independently arranged, or some or all of the above units may be integrated. For example, the transceiver module 1720 may include a transmitting module and a receiving module.

[0349] In some possible implementations, the communication device 1700 may correspondingly implement the operations and functions of the terminal device in the above method embodiments. For example, the communication device 1700 may be a terminal device or a component (e.g., a chip or circuit) used in a terminal device. For example, the transceiver module 1720 may be configured to perform all the receiving or transmitting operations performed by the terminal device in the embodiments of Figures 5, 6, 8, 10, and 12, such as steps 501, 502, and 503 in the embodiment shown in Figure 5, steps 602, 603, and 604 in the embodiment shown in Figure 6, steps 802, 803, and 804 in the embodiment shown in Figure 8, steps 1002, 1003, and 1004 in the embodiment shown in Figure 10, and steps 1201, 1203, and 1205 in the embodiment shown in Figure 12, and / or other processes used to support the techniques described herein. The processing module 1710 is configured to perform all operations other than the transmitting and receiving operations performed by the terminal device in the embodiments of Figures 5, 6, 8, 10, and 12, for example, step 501 and step 503 in the embodiment shown in Figure 5, step 601 in the embodiment shown in Figure 6, step 801 in the embodiment shown in Figure 8, step 1001 in the embodiment shown in Figure 10, and step 1204 in the embodiment shown in Figure 12.

[0350] In some possible implementations, the communication device 1700 may correspondingly implement the operations and functions of the access network device in the above method embodiments. For example, the communication device 1700 may be an access network device or a component (e.g., a chip or circuit) used in an access network device. For example, the transceiver module 1720 may be configured to perform all the receiving or transmitting operations performed by the terminal device in the embodiments of Figures 5, 6, 8, 10, and 12, such as steps 501, 502, and 503 in the embodiment shown in Figure 5, steps 602, 603, and 604 in the embodiment shown in Figure 6, steps 802, 803, and 804 in the embodiment shown in Figure 8, steps 1002, 1003, and 1004 in the embodiment shown in Figure 10, and steps 1201, 1203, and 1205 in the embodiment shown in Figure 12, and / or other processes used to support the techniques described herein. The processing module 1710 is configured to perform all operations other than the transmitting and receiving operations performed by the terminal device in the embodiments of Figures 5, 6, 8, 10, and 12, for example, step 1202 in the embodiment shown in Figure 12. The processing module 1710 may be configured to generate pre-coding indication information.

[0351] In some possible implementations, the communication device 1700 may correspondingly implement the operations and functions of the terminal device in the above method embodiments. For example, the communication device 1700 may be a terminal device, or may be a component (e.g., a chip or circuit) used in a terminal device. For example, the transceiver module 1720 may be configured to perform all the receiving or transmitting operations performed by the terminal device in the embodiment shown in FIG. 13, e.g., step 1301, step 1303, and step 1305 in the embodiment shown in FIG. 13, and / or another process used to support the techniques described herein. The processing module 1710 is configured to perform all the operations other than the transmitting and receiving operations performed by the terminal device in the embodiment of FIG. 13, e.g., step 1304 in the embodiment shown in FIG. 13.

[0352] In some possible implementations, the communication device 1700 may correspondingly implement the operations and functions of the access network device in the above method embodiments. For example, the communication device 1700 may be an access network device, or may be a component (e.g., a chip or circuit) used in an access network device. For example, the transceiver module 1720 may be configured to perform all the receiving or transmitting operations performed by the terminal device in the embodiment of FIG. 13, e.g., steps 1301, 1303, and 1305 in the embodiment of FIG. 13, and / or another process used to support the techniques described herein. The processing module 1710 is configured to perform all the operations other than the transmitting and receiving operations performed by the terminal device in the embodiment of FIG. 13, e.g., step 1302 in the embodiment shown in FIG. 13.

[0353] 18 is a diagram of the structure of another communication device 180 according to an embodiment of the present invention. The communication device in FIG. 18 may be the terminal device described above. The communication device in FIG. 18 may be the access network device described above.

[0354] As shown in FIG. 18, the communications device 180 includes at least one processor 1820 and a transceiver 1810.

[0355] In some other embodiments of the present application, the processor 1820 and the transceiver 1810 may be configured to perform functions, operations, etc. performed by a terminal device. For example, the processor 1820 may perform one or more operations of steps 501 and 503 in the embodiment shown in Figure 5, step 601 in the embodiment shown in Figure 6, step 801 in the embodiment shown in Figure 8, step 1001 in the embodiment shown in Figure 10, and step 1204 in the embodiment shown in Figure 12. For example, the transceiver 1810 may perform one or more of the operations of steps 501, 502, and 503 in the embodiment shown in FIG. 5, steps 602, 603, and 604 in the embodiment shown in FIG. 6, steps 802, 803, and 804 in the embodiment shown in FIG. 8, steps 1002, 1003, and 1004 in the embodiment shown in FIG. 10, and steps 1201, 1203, and 1205 in the embodiment shown in FIG. 12.

[0356] In some embodiments of the present application, the processor 1820 and the transceiver 1810 may be configured to perform functions, operations, etc. performed by an access network device. For example, the processor 1820 may perform one or more of the following operations: step 1202 in the embodiment shown in Figure 12. For example, the transceiver 1810 may perform one or more of the operations of steps 501, 502, and 503 in the embodiment shown in Figure 5, steps 602, 603, and 604 in the embodiment shown in Figure 6, steps 802, 803, and 804 in the embodiment shown in Figure 8, steps 1002, 1003, and 1004 in the embodiment shown in Figure 10, and steps 1201, 1203, and 1205 in the embodiment shown in Figure 12.

[0357] In some embodiments of the present application, the processor 1820 and the transceiver 1810 may be configured to perform functions, operations, etc. performed by a terminal device. For example, the processor 1820 may perform one or more of the following operations: step 1304 in the embodiment shown in Figure 13. The transceiver 1810 may perform one or more of the operations of steps 1301, 1303, and 1305 in the embodiment shown in Figure 13.

[0358] In some embodiments of the present application, the processor 1820 and the transceiver 1810 may be configured to perform functions, operations, etc. performed by an access network device. For example, the processor 1820 may perform one or more of the following operations: step 1302 in the embodiment shown in Figure 13. The transceiver 1810 may perform one or more of the operations of steps 1301, 1303, and 1305 in the embodiment shown in Figure 13.

[0359] The transceiver 1810 is configured to communicate with another device / apparatus over a transmission medium. The processor 1820 is configured to receive and transmit data and / or signaling via the transceiver 1810 and to perform the method in the method embodiments described above. The processor 1820 may implement the functionality of the processing module 1710, and the transceiver 1810 may implement the functionality of the transceiver module 1720.

[0360] Optionally, the communication device 180 may further include at least one memory 1830 configured to store program instructions and / or data. The memory 1830 is coupled to the processor 1820. The coupling in this embodiment of the present application may be an indirect coupling or communication connection between the devices, units, or modules in an electrical, mechanical, or other form, and is used for information exchange between the devices, units, or modules. The processor 1820 may cooperate with the memory 1830. The processor 1820 may execute the program instructions stored in the memory 1830. At least one of the at least one memory may be included in the processor.

[0361] The specific connection medium between the transceiver 1810, the processor 1820, and the memory 1830 is not limited in this embodiment of the present application. In this embodiment of the present application, the memory 1830, the processor 1820, and the transceiver 1810 are connected through a bus 1840 in FIG. 18. In FIG. 18, the bus is shown with a thick line. The manner of connection between the other components is only an example for explanation and is not limited thereto. The bus may be classified into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used to represent a bus in FIG. 18, but this does not mean that there is only one bus or only one type of bus.

[0362] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or another programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed with reference to the embodiments of the present application may be directly executed by a hardware processor, or may be executed by using a combination of hardware and software modules in the processor.

[0363] FIG. 19 is a diagram of the structure of another communication device 190 according to an embodiment of the present invention. As shown in FIG. 19, the communication device shown in FIG. 19 includes a logic circuit 1901 and an interface 1902. The processing module 1910 of FIG. 19 may be implemented by using the logic circuit 1901, and the transceiver module 1920 of FIG. 19 may be implemented by using the interface 1902. The logic circuit 1901 may be a chip, a processing circuit, an integrated circuit, a system on chip (SoC), etc., and the interface 1902 may be a communication interface, an input / output interface, etc. In this embodiment of the present application, the logic circuit and the interface may be coupled to each other. The specific manner of the connection between the logic circuit and the interface is not limited in this embodiment of the present application.

[0364] In some embodiments of the present application, the logic circuits and interfaces may be configured to perform functions, operations, etc. performed by an access network device.

[0365] In some other embodiments of the present application, the logic circuits and interfaces may be configured to perform functions, operations, etc. performed by a terminal device.

[0366] The present application further provides a computer-readable storage medium, which stores computer code, which, when executed on a computer, enables the computer to perform the method in the above-mentioned embodiments.

[0367] The present application further provides a computer program product, which includes a computer code or a computer program, which, when executed on a computer, performs the early synchronization method in the above-mentioned embodiment.

[0368] The present application further provides a communication system including the aforementioned terminal device and the aforementioned access network device.

[0369] The above description is merely a specific implementation of the present application and is not intended to limit the scope of protection of the present application. Any variations or replacements that are easily conceived by those skilled in the art within the technical scope disclosed in this application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. 13. A method of communication comprising: transmitting, by a terminal device, an uplink reference signal to an access network device based on a transmission pattern, where an uplink reference signal resource of the uplink reference signal includes N ports, the N ports in the transmission pattern have at least two port groups, each port group corresponds to a same time-frequency resource, and different port groups correspond to different time-frequency resources, the N ports in the transmission pattern are carried in two or more orthogonal frequency division multiplexing OFDM symbols, or the N ports in the transmission pattern are carried in two or more frequency domain combs and one OFDM symbol, and N is an integer greater than 4; receiving, by the terminal device, pre-coding indication information from the access network device, the pre-coding indication information indicating pre-coding for transmitting uplink data, the pre-coding indication information being obtained by transmission to the access network device based on the uplink reference signal, and rows of a matrix corresponding to the pre-coding have a one-to-one correspondence with the N ports; method.

2. The uplink reference signal is a channel sounding reference signal (SRS), the uplink reference signal resource is an SRS resource, the uplink data is carried on a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH), and N is 8; The terminal device maps the uplink data to antenna ports based on the precoding, the number of the antenna ports is the same as the number of ports in the SRS resource, and the antenna ports have a one-to-one correspondence with the ports in the SRS resource. The method of claim 1.

3. N is 8, and the N ports in the transmission pattern are carried in two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 2, and two ports located in the same frequency-domain comb and OFDM symbol correspond to two different cyclic shift CS values; the N ports in the transmission pattern are carried in one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 2, and four ports located in the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmission pattern are carried in two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 2, and four ports located in the same frequency-domain comb and OFDM symbol correspond to four different CS values. The method according to claim 1 or 2.

4. The method further comprises: determining, by the terminal device, the transmission pattern from two or more patterns based on a CS reference value indicator of the uplink reference signal included in the uplink reference signal resource configuration information; The method according to claim 3.

5. The configuration information further comprises a comb position indicator of the uplink reference signal. [0010] and the frequency domain comb number K TC wherein the two or more patterns include at least two of a first pattern, a second pattern, and a third pattern; In the first pattern, a comb corresponding to a first set of the N ports is [0025] and the comb corresponding to the second set of N ports is [0030] an OFDM symbol index corresponding to two ports in the first port set is l, an OFDM index corresponding to the remaining two ports in the first port set is (l+n), an OFDM symbol index corresponding to two ports in the second port set is l, and an OFDM index corresponding to the remaining two ports in the second port set is (l+n), where n is an integer greater than or equal to 1 and l is an integer greater than or equal to 0; In the second pattern, the combs corresponding to the first and second sets of ports of the N ports are [0045] an index of an OFDM symbol corresponding to the first port set is l, an index of an OFDM symbol corresponding to the second port set is (l+n), n is an integer greater than or equal to 1, and l is an integer greater than or equal to 0; In the third pattern, the comb corresponding to the first set of ports among the N ports is [0050] and the comb corresponding to the second set of N ports is [006] an index of an OFDM symbol corresponding to the first port set and the second port set is l, where l is an integer equal to or greater than 0; the ports included in the first port set are different from the ports included in the second port set; The method according to claim 4.

6. N is 8, and the N ports in the transmission pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports in the transmission pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; the N ports in the transmission pattern are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmission pattern are carried on four frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values. The method according to claim 1 or 2.

7. The method further comprises: determining, by the terminal device, the transmission pattern from two or more patterns based on a CS reference value indicator in configuration information; The method according to claim 6.

8. The configuration information further comprises a comb position indicator [0070] and the frequency domain comb number K TC wherein the two or more patterns include at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern; In the first pattern, a comb corresponding to a first set of the N ports is [0080] and the comb corresponding to the second set of N ports is [0090] an OFDM symbol index corresponding to two ports in the first port set is l, an OFDM index corresponding to the remaining two ports in the first port set is (l+n), an OFDM symbol index corresponding to two ports in the second port set is l, and an OFDM index corresponding to the remaining two ports in the second port set is (l+n), where n is an integer greater than or equal to 1 and l is an integer greater than or equal to 0; In the second pattern, the combs corresponding to the first and second sets of ports of the N ports are [0010] an index of an OFDM symbol corresponding to the first port set is l, an index of an OFDM symbol corresponding to the second port set is (l+n), where l and n are integers equal to or greater than 1; In the third pattern, the comb corresponding to the first set of N ports is ##EQU00011## and the comb corresponding to the second set of N ports is ##EQU00012## an index of an OFDM symbol corresponding to the first port set and the second port set is l, where l is an integer equal to or greater than 1; In the fourth pattern, the combs corresponding to the four port sets of the N ports are ##EQU00013## and the index of the OFDM symbol corresponding to these four port sets is l, where l is an integer equal to or greater than 1; the ports included in the first port set are different from the ports included in the second port set; The method of claim 7.

9. The method further comprises: determining, by the terminal device, the transmission pattern from two or more patterns based on a CS reference value indicator, a maximum CS indicator, and a symbol number included in the uplink reference signal resource configuration information, the two or more patterns including at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern, the symbol number indicating a number of OFDM symbols carrying the N ports; In the first pattern, a comb corresponding to a first set of the N ports is ##EQU14## and the comb corresponding to the second set of N ports is ##EQU00015## an OFDM symbol index corresponding to two ports in the first port set is l, an OFDM index corresponding to the remaining two ports in the first port set is (l+n), an OFDM index corresponding to two ports in the second port set is l, and an OFDM symbol index corresponding to the remaining two ports in the second port set is (l+n), n is an integer greater than or equal to 1, and l is an integer greater than or equal to 0; In the second pattern, the combs corresponding to the first and second sets of ports of the N ports are ##EQU00016## an index of an OFDM symbol corresponding to the first port set is l, an index of an OFDM symbol corresponding to the second port set is (l+n), where l and n are integers equal to or greater than 1; In the third pattern, the comb corresponding to the first set of ports among the N ports is ##EQU00017## and the comb corresponding to the second set of N ports is [0018] an index of an OFDM symbol corresponding to the first port set and the second port set is l, where l is an integer equal to or greater than 1; In the fourth pattern, the combs corresponding to the four port sets of the N ports are [0019] where the index of the OFDM symbol corresponding to the set of four ports is l, where l is an integer equal to or greater than 1; the ports included in the first port set are different from the ports included in the second port set; The method according to claim 6.

10. N is 8, and the N ports in the transmission pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 8, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports in the transmission pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; the N ports in the transmission pattern are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmission pattern are carried on four frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values. The method according to claim 1 or 2.

11. The method further comprises: determining, by the terminal device, the transmission pattern from two or more patterns based on a CS reference value indicator and a maximum CS indicator of the uplink reference signal included in the uplink reference signal resource configuration information; The method of claim 10.

12. The configuration information further comprises a comb position indicator [0020] and the frequency domain comb number K TC wherein the two or more patterns include at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern; In the first pattern, a comb corresponding to a first set of the N ports is ##EQU00021## and the comb corresponding to the second set of N ports is [0022] an OFDM symbol index corresponding to two ports in the first port set is l, an OFDM symbol index corresponding to the remaining two ports in the first port set is (l+n), an OFDM index corresponding to two ports in the second port set is l, and an OFDM symbol index corresponding to the remaining two ports in the second port set is (l+n), where n is an integer greater than or equal to 1 and l is an integer greater than or equal to 0; In the second pattern, the combs corresponding to the first and second sets of ports of the N ports are [0023] an index of an OFDM symbol corresponding to the first port set is l, an index of an OFDM symbol corresponding to the second port set is (l+n), where l and n are integers equal to or greater than 1; In the third pattern, the comb corresponding to the first set of N ports is ##EQU00024## and the comb corresponding to the second set of N ports is [0025] an index of an OFDM symbol corresponding to the first port set and the second port set is l, where l is an integer equal to or greater than 1; In the fourth pattern, the combs corresponding to the four port sets of the N ports are [0026] where the index of the OFDM symbol corresponding to the set of four ports is l, where l is an integer equal to or greater than 1; the ports included in the first port set are different from the ports included in the second port set; The method of claim 11.

13. The method further comprises: determining, by the terminal device, the transmission pattern from two or more patterns based on a CS reference value indicator, a maximum CS indicator, and a symbol number included in the uplink reference signal resource configuration information, the two or more patterns including at least two of a first pattern, a second pattern, a third pattern, and a fourth pattern, the symbol number indicating a number of OFDM symbols carrying the N ports; In the first pattern, a comb corresponding to a first set of the N ports is [0027] and the comb corresponding to the second set of N ports is [0028] an OFDM symbol index corresponding to two ports in the first port set is l, an OFDM index corresponding to the remaining two ports in the first port set is (l+n), an OFDM index corresponding to two ports in the second port set is l, and an OFDM symbol index corresponding to the remaining two ports in the second port set is (l+n), n is an integer greater than or equal to 1, and l is an integer greater than or equal to 0; In the second pattern, the combs corresponding to the first and second sets of ports of the N ports are [0029] an index of an OFDM symbol corresponding to the first port set is l, an index of an OFDM symbol corresponding to the second port set is (l+n), where l and n are integers equal to or greater than 1; In the third pattern, the comb corresponding to the first set of ports among the N ports is [0030] and the comb corresponding to the second set of N ports is [0031] an index of an OFDM symbol corresponding to the first port set and the second port set is l, where l is an integer equal to or greater than 1; In the fourth pattern, the combs corresponding to the four port sets of the N ports are [0032] where the index of the OFDM symbol corresponding to the set of four ports is l, where l is an integer equal to or greater than 1; the ports included in the first port set are different from the ports included in the second port set; The method of claim 10.

14. A transmission power of the uplink reference signal is determined based on the transmission pattern, and the transmission pattern is a transmission pattern in which the N ports are symb SRS When we show that the signal is carried by OFDM symbols, the maximum transmit power of each port is P CMAX ×N symb SRS / N ap SRS Not exceeding P CMAX is the maximum transmit power configured for the terminal device, and N symb SRS is an integer greater than 1, and N ap SRS is equal to N, 14. The method according to any one of claims 1 to 13.

15. 13. A method of communication comprising: receiving, by an access network device, an uplink reference signal transmitted by a terminal device, where an uplink reference signal resource of the uplink reference signal includes N ports, the N ports being carried in two or more orthogonal frequency division multiplexing OFDM symbols, or the N ports being carried in two or more frequency domain combs and one OFDM symbol, where N is an integer greater than 4; sending, by the access network device, precoding indication information to the terminal device, the precoding indication information indicating precoding for transmitting uplink data of the terminal device, the precoding indication information being obtained by the access network device based on the uplink reference signal, and rows of a matrix corresponding to the precoding have a one-to-one correspondence with the N ports; method.

16. The uplink reference signal is an SRS, the uplink reference signal resource is an SRS resource, the uplink data is carried on a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH), and N is 8; the pre-coding is used by the terminal device to map the uplink data to antenna ports, the number of the antenna ports is the same as the number of ports in the SRS resource, and the antenna ports have a one-to-one correspondence with the ports in the SRS resource. The method of claim 15.

17. N is 8, and the N ports are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 2, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different cyclic shift CS values; the N ports are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 2, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 2, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values.

17. The method according to claim 15 or 16.

18. N is 8, and the N ports are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; the N ports are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports are carried on four frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 4, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values.

17. The method according to claim 15 or 16.

19. N is 8, and the N ports in the transmission pattern are carried on two frequency-domain combs and two OFDM symbols with a frequency-domain comb number of 8, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values; the N ports in the transmission pattern are carried on one frequency-domain comb and two OFDM symbols with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; the N ports in the transmission pattern are carried on two frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, and four ports located on the same frequency-domain comb and OFDM symbol correspond to four different CS values; or the N ports in the transmission pattern are carried on four frequency-domain combs and one OFDM symbol with a frequency-domain comb number of 8, and two ports located on the same frequency-domain comb and OFDM symbol correspond to two different CS values.

17. The method according to claim 15 or 16.

20. A transmission power of the uplink reference signal is determined by the terminal device based on the transmission pattern, and the transmission pattern is determined such that the N ports are symb SRS When we show that the signal is carried by OFDM symbols, the maximum transmit power of each port is P CMAX ×N symb SRS / N ap SRS Not exceeding P CMAX is the maximum transmit power configured for the terminal device, and N symb SRS is an integer greater than 1, and N ap SRS is equal to N, 20. The method according to any one of claims 15 to 19.

21. A communication device comprising a module or unit adapted to carry out the method according to any one of claims 1 to 14.

22. A communication device comprising a module or unit adapted to carry out the method according to any one of claims 15 to 20.

23. 21. A computer readable storage medium storing a computer program, the computer program comprising program instructions which, when executed by a processor, cause the method of any one of claims 1 to 14 to be performed, or cause the method of any one of claims 15 to 20 to be performed.

24. A communications device comprising a processor, the processor coupled to a memory, the memory storing instructions, the processor configured to execute the instructions, whereby the communications device performs a method according to any one of claims 1 to 14, or the communications device performs a method according to any one of claims 15 to 20.

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