TECHNICAL FIELD

The present disclosure relates to the field of communication, and more particularly, to a wireless communication method, a terminal device, and a network device.

BACKGROUND

In a wireless communication system, a demodulation reference signal (DMRS) sequence may be used for correlation demodulation of a channel. When multi-user multiplexing is performed in an uplink, orthogonality may be obtained between different terminal devices by using a same DMRS sequence, but different cyclic shifts or different orthogonal codes. A number of terminal devices that use orthogonal codes to obtain orthogonality for supporting multiplexing is small.

The terminal device may use, for example, discrete Fourier transform orthogonal frequency division multiplexing based spread spectrum (DFT-S-OFDM) multiple access mode or cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) multiple access mode for uplink transmission. The DFT-S-OFDM multiple access mode may also be referred to as single carrier-frequency division multiple access (SC-FDMA) mode. The CP-OFDM system may also be referred to as orthogonal frequency division multiple access (OFDMA) mode.

How to realize multi-user multiplexing performed by terminal devices that transmit DMRS sequences using different multiple access modes is an urgent problem to be solved.

SUMMARY

Implementations of the present disclosure provide a wireless communication method, a terminal device and a network device, which can realize multi-user multiplexing performed by terminal devices that transmit DMRS sequences using different multiple access modes.

A first aspect provides a wireless communication method, including:

determining, by a terminal device, a quantity K of demodulation reference signal DMRS sequences corresponding to a first DMRS port and a physical resource occupied by each DMRS sequence in the K DMRS sequences, where K is a positive integer; and

sending, on the determined physical resource occupied by the each DMRS sequence, the each DMRS sequence to a network device using the first DMRS port.

In combination with the first aspect, in a possible implementation of the first aspect, the determining, by a terminal device, a quantity K of DMRS sequences corresponding to a first DMRS port and a physical resource occupied by each DMRS sequence in the K DMRS sequences, includes:

determining, by the terminal device, the quantity K of the DMRS sequences corresponding to the first DMRS port and/or the physical resource occupied by the each DMRS sequence in the K DMRS sequences according to a multiple access mode used in sending the DMRS sequences using the first DMRS port.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, the determining, by the terminal device, the quantity K of the DMRS sequences corresponding to the first DMRS port according to a multiple access mode used in sending the DMRS sequences using the first DMRS port, includes:

determining the quantity K of the DMRS sequences corresponding to the first DMRS port according to a first corresponding relation and the multiple access mode used in sending the DMRS sequences using the first DMRS port;

where, the first corresponding relation is configured to indicate a quantity of DMRS sequences corresponding to the first DMRS port under each multiple access mode in at least one multiple access mode.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, the determining, by the terminal device, the physical resource occupied by the each DMRS sequence in the K DMRS sequences according to a multiple access mode used in sending the DMRS sequences using the first DMRS port, includes:

determining the physical resource occupied by the each DMRS sequence in the K DMRS sequences according to a second corresponding relation and the multiple access mode used in sending the DMRS sequences using the first DMRS port;

where, the second corresponding relation is configured to indicate a physical resource corresponding to each DMRS sequence in at least one DMRS sequence corresponding to the first DMRS port under each multiple access mode in at least one multiple access mode.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, when the multiple access mode used in sending the DMRS sequences using the first DMRS port is a first multiple access mode, the K DMRS sequences include a first DMRS sequence, where the first DMRS sequence occupies a same physical resource and/or uses a same root sequence as a second DMRS sequence included in DMRS sequences transmitted using a same DMRS port when a second multiple access mode is used, where the second multiple access anode is difference from the first multiple access mode.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, the first multiple access mode is a discrete Fourier transform orthogonal frequency division multiplexing based spread spectrum DFT-S-OFDM multiple access mode, and the second multiple access mode is a cyclic prefix orthogonal frequency division multiplexing CP-OFDM multiple access mode; or,

the first multiple access mode is the CP-OFDM multiple access mode, and the second multiple access mode is the DFT-S-OFDM multiple access mode.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, when the multiple access mode used in sending the DMRS sequences using the first DMRS port is a DFT-S-OFDM multiple access mode, K is an integer greater than 1; and/or,

when the multiple access mode used in sending the DMRS sequences using the first DMRS port is a CP-OFDM multiple access mode, K is 1.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, the determining, by a terminal device, a quantity K of demodulation reference signal DMRS sequences corresponding to a first DMRS port, includes:

determining, by the terminal device, the quantity K of the DMRS sequences corresponding to the first DMRS port according to DMRS sequence indication information carried in downlink control information DCI transmitted by scheduling data corresponding to the DMRS sequences by the network device.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, K is an integer greater than 1.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, when a value of K is greater than 1, DMRS sequences in the K DMRS sequences having a same length uses a same sequence.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, when a value of K is greater than 1, the each DMRS sequence in the K DMRS sequences occupies, in at least one orthogonal frequency division multiplexing OFDM symbol, different sub-carriers in a same frequency domain bandwidth respectively.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, a sub-carrier occupied by an mthDMRS sequence in the K DMRS sequences is: an (m+iK)thsub-carrier in the frequency domain bandwidth, where i=0,1 . . . └(S−m)/K┘, and S is a quantity of sub-carriers included in the frequency domain bandwidth.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, K=2, and a subcarrier occupied by a first DMRS sequence in the K DMRS sequences is an (n+jN)thsubcarrier in the frequency domain bandwidth, and a second DMRS sequence occupies the rest subcarrier in the frequency domain bandwidth, where j=0,1 . . . └(S−n)/N┘, N is a positive integer greater than 1, and n is a positive integer less than or equal to N.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, each DMRS sequence in at least one DMRS sequence in the K DMRS sequences occupies different sub-carriers in different OFDM symbols.

In combination with the first aspect or any one of the above possible implementations thereof, in a possible implementation of the first aspect, the determining, by a terminal device, a quantity K of DMRS sequences corresponding to a first DMRS port and a physical resource occupied by each DMRS sequence in the K DMRS sequences includes:

determining, by the terminal device, the quantity K of the DMRS sequences corresponding to the first DMRS port; and

determining, by the terminal device, a resource offset between physical resources occupied by different DMRS sequences in the K DMRS sequences according to the quantity K when the K is greater than 1.

A second aspect provides a wireless communication method, including:

determining, by a network device, a quantity K of demodulation reference signal DMRS sequences sent by a terminal device using a first DMRS port, and a physical resource occupied by each DMRS sequence in the K DMRS sequences; and

receiving, on the determined physical resource occupied by the each DMRS sequence, the each DMRS sequence sent by the terminal device.

In combination with the second aspect, in a possible implementation of the second aspect, the determining, by a network device, a quantity K of demodulation reference signal DMRS sequences sent by a terminal device using a first DMRS port and a physical resource occupied by each DMRS sequence in the K DMRS sequences, includes:

determining, by the network device, the quantity K of the DMRS sequences sent by the terminal device using the first DMRS port and/or the physical resource occupied by the each DMRS sequence in the K DMRS sequences according to a multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, the determining, by the network device, the quantity K of the DMRS sequences sent by the terminal device using the first DMRS port according to a multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port includes:

determining the quantity K of the DMRS sequences sent by the terminal device using the first DMRS port according to a first corresponding relation and the multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port; where,

the first corresponding relation is configured to indicate a quantity of DMRS sequences corresponding to the first DMRS port under each multiple access mode in at least one multiple access mode.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, the determining, by the network device, the physical resource occupied by the each DMRS sequence in the K DMRS sequences according to a multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port, includes:

determining the physical resource occupied by the each DMRS sequence in the K DMRS sequences according to a second corresponding relation and the multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port; where,

the second corresponding relation is configured to indicate a physical resource corresponding to each DMRS sequence in at least one DMRS sequence corresponding to the first DMRS port under each multiple access mode in at least one multiple access mode.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, the method further includes:

indicating, by the network device, the quantity K of the DMRS sequences corresponding to the first DMRS port to the terminal device by DMRS sequence indication information carried in downlink control information DCI transmitted by scheduling data corresponding to the DMRS sequences.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, when the multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port is a DFT-S-OFDM multiple access mode, K is an integer greater than 1; and/or,

when the multiple access mode used by the terminal device in sending the DMRS sequences using the first DMRS port is a CP-OFDM multiple access mode, K is 1.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, K is an integer greater than 1.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, when a value of K is greater than 1, the each DMRS sequence in the K DMRS sequences occupies, in at least one OFDM symbol, different sub-carriers in a same frequency domain bandwidth respectively.

In combination with the second aspect or any one of the above possible implementations thereof, in a possible implementation of the second aspect, each DMRS sequence in at least one DMRS sequence in the K DMRS sequences occupies different sub-carriers in different OFDM symbols.

A third aspect provides a terminal device, which may include a unit configured to implement the method of the first aspect or any one of the possible implementations of the first aspect described above.

A fourth aspect provides a network device, which may include a unit configured to implement the method of the second aspect or any one of the possible implementations of the second aspect described above.

A fifth aspect provides a terminal device, which may include a memory and a processor, where the memory stores an instruction, and the processor is configured to invoke the instruction stored in the memory to perform the method according to the first aspect or any one of the possible implementations of the first aspect.

A sixth aspect provides a network device, which may include a memory and a processor, where the memory stores an instruction, and the processor is configured to invoke the instruction stored in the memory to perform the method according to the second aspect or any one of the possible implementations of the second aspect.

A seventh aspect provides a computer readable medium, configured to store a program code executed by a terminal device, where the program code includes an instruction configured to perform the method according to the first aspect or the various implementations of the first aspect, or includes an instruction configured to perform the method according to the second aspect or the various implementations of the second aspect.

An eighth aspect provides a system chip, including an input interface, an output interface, a processor and a memory, where the processor is configured to execute a code in the memory, and when the code is executed, the processor may implement the method according to the first aspect and the various implementations of the first aspect described above, or perform the method according to the second aspect and the various implementations of the second aspect described above.

Therefore, in the implementations of the present disclosure, a quantity of DMRS sequences corresponding to one DMRS port may not be unique and may be flexibly changed. For example, such corresponding relationship may be set according to a multiple access mode used by a plurality of terminal devices which need orthogonal multiplexing, so that multi-user multiplexing of terminal devices that use different multiple access modes may be supported. Further, since the quantity of the DMRS sequences corresponding to one DMRS port and resource occupied by each sequence may be flexibly changed, it may be realized that there is at least one DMRS sequence in the terminal devices using different multiple access modes that corresponds to a same root sequence and/or occupy a same physical resource, so that the terminal devices using different multiple access modes can obtain DMRS orthogonality by using different cyclic shifts, thereby enabling multi-user multiplexing transmission supporting more terminal devices.

