Data transmission method, network device, and terminal device
Embodiments of the present disclosure provide a data transmission method, a network device, and a terminal. The data transmission method includes: receiving, by a network device, a first reference signal and a first physical channel that are sent by a first terminal device, where the first reference signal is at the i th symbol in a slot, i is a positive integer less than 7, the first physical channel occupies n symbols in the slot, and n is 1, 2, or 3; and demodulating, by the network device, the first physical channel according to the first reference signal. According to the present disclosure, a data transmission latency can be reduced.
1. A data transmission method, comprising:
receiving, by a network device from a first terminal device, a first reference signal and a first physical channel, wherein the first reference signal is at an i th symbol in a slot, i is a positive integer less than 7, the first physical channel occupies n symbols in the slot, and n is 1, 2, or 3; and
demodulating, by the network device, the first physical channel according to the first reference signal,
wherein before the receiving the first reference signal and the first physical channel, the method further comprises: sending, by the network device, first downlink control information to the first terminal device, wherein the first downlink control information comprises configuration information that indicates the first reference signal, and wherein the configuration information that indicates the first reference signal comprises a transmission comb of the first reference signal and cyclic shift of the first reference signal.
2. The method according to claim 1 , wherein:
the first reference signal occupies contiguous subcarriers in a frequency domain, and a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel.
3. The method according to claim 1 , wherein:
the first reference signal occupies even-numbered subcarriers or odd-numbered subcarriers in a frequency domain, and twice a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel.
4. A data transmission method, comprising:
configuring, by a terminal device, a first reference signal and a first physical channel, wherein the first reference signal is at an i th symbol in a slot, i is a positive integer less than 7, the first physical channel occupies n symbols in the slot, and n is 1, 2, or 3; and
sending, by the terminal device, the first reference signal and the first physical channel to a network device, wherein the first reference signal occupies odd-numbered subcarriers or even-numbered subcarriers in a frequency domain, and twice a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel.
5. The method according to claim 4 , wherein before the configuring the first reference signal and the first physical channel, the method further comprising:
receiving, by the terminal device, first downlink control information sent by the network device, wherein the first downlink control information comprises configuration information that indicates the first reference signal, and wherein the configuration information that indicates the first reference signal comprises a transmission comb of the first reference signal and cyclic shift of the first reference signal.
6. The method according to claim 4 , wherein the first reference signal is further used for demodulating a second physical channel, the method further comprising:
configuring, by the terminal device, the second physical channel, wherein the second physical channel occupies m symbols in the slot, m is 1, 2, or 3, and the symbol occupied by the second physical channel is different from the symbol occupied by the first physical channel; and
sending, by the terminal device, the second physical channel to the network device.
7. A network device, comprising:
a memory storing instructions; and
a processor coupled to the memory to execute the instructions to:
receive a first reference signal and a first physical channel from a first terminal device, wherein the first reference signal is at an i th symbol in a slot, i is a positive integer less than 7, the first physical channel occupies n symbols in the slot, and n is 1, 2, or 3;
demodulate the first physical channel according to the first reference signal;
after receiving the first reference signal and the first physical channel, receive a second physical channel sent by the first terminal device, wherein the second physical channel occupies m symbols in the slot, m is 1, 2, or 3, and the symbol occupied by the second physical channel is different from the symbol occupied by the first physical channel; and
demodulate the second physical channel according to the first reference signal.
8. The device according to claim 7 , wherein the processor further executes the instructions to:
send first downlink control information to the first terminal device before receiving the first reference signal and the first physical channel, wherein the first downlink control information comprises configuration information used to indicate the first reference signal, and wherein the configuration information that indicates the first reference signal comprises a transmission comb of the first reference signal and cyclic shift of the first reference signal.
9. The device according to claim 7 , wherein:
the first reference signal occupies contiguous subcarriers in a frequency domain, and a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel.
10. The device according to claim 7 , wherein the processor further executes the instructions to:
receive a second reference signal and a third physical channel from a second terminal device, wherein the second reference signal is at the i th symbol in the slot, i is the positive integer less than 7, the third physical channel occupies p symbols in the slot, and p is 1, 2, or 3; and
demodulate the third physical channel according to the second reference signal, wherein the symbol occupied by the first physical channel is different from the symbol occupied by the third physical channel.
11. The device according to claim 10 , wherein the processor further executes the instructions to:
send second downlink control information to the second terminal device before receiving the second reference signal and the third physical channel, wherein the second downlink control information comprises configuration information that indicates the second reference signal, the configuration information that indicates the second reference signal comprises a transmission comb of the second reference signal and cyclic shift of the second reference signal.
12. The device according to claim 10 , wherein:
the first reference signal occupies odd-numbered subcarriers in a frequency domain, and the second reference signal occupies even-numbered subcarriers in the frequency domain; or
the second reference signal occupies odd-numbered subcarriers in a frequency domain, and the first reference signal occupies even-numbered subcarriers in the frequency domain; or
twice a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel, and twice a quantity of subcarriers occupied by the second reference signal is greater than or equal to a quantity of subcarriers occupied by the third physical channel.
13. The device according to claim 12 , wherein the processor further executes the instructions to:
generate a base sequence, wherein a length of the base sequence is greater than or equal to the quantity of subcarriers occupied by the first physical channel;
perform cyclic shift on the base sequence to obtain an initial reference signal sequence;
sample the initial reference signal sequence at an interval, to obtain a sequence of the first reference signal; and
demodulate the first physical channel according to the sequence of the first reference signal.
14. The device according to claim 7 , wherein:
the first reference signal occupies odd-numbered subcarriers or even-numbered subcarriers in a frequency domain, and twice a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel.
15. A terminal device, comprising:
a memory storing instructions; and
a processor coupled to the memory to execute the instructions to:
configure a first reference signal and a first physical channel, wherein the first reference signal is at an i th symbol in a slot, i is a positive integer less than 7, the first physical channel occupies n symbols in the slot, and n is 1, 2, or 3; and
send the first reference signal and the first physical channel to a network device;
wherein before configuring the first reference signal and the first physical channel, the processor further executes the instructions to: receive first downlink control information sent by the network device, wherein the first downlink control information comprises configuration information that indicates the first reference signal, and wherein the configuration information that indicates the first reference signal comprises a transmission comb of the first reference signal and cyclic shift of the first reference signal.
16. The device according to claim 15 , wherein the first reference signal occupies odd-numbered subcarriers or even-numbered subcarriers in a frequency domain, and twice a quantity of subcarriers occupied by the first reference signal is greater than or equal to a quantity of subcarriers occupied by the first physical channel.
17. The device according to claim 15 , wherein the first reference signal is further used for demodulating a second physical channel, and the processor further executes the instructions to:
configure the second physical channel, wherein the second physical channel occupies m symbols in the slot, m is 1, 2, or 3, and the symbol occupied by the second physical channel is different from the symbol occupied by the first physical channel; and
send the second physical channel to the network device.
18. A non-transitory computer-readable storage medium comprising instructions that, when executed, cause a processor to:
configure a first reference signal and a first physical channel, wherein the first reference signal is at an i th symbol in a slot, i is a positive integer less than 7, the first physical channel occupies n symbols in the slot, and n is 1, 2, or 3;
send the first reference signal and the first physical channel to a network device; and
before configuring the first reference signal and the first physical channel, receive first downlink control information sent by the network device, wherein the first downlink control information comprises configuration information that indicates the first reference signal, and wherein the configuration information that indicates the first reference signal comprises a transmission comb of the first reference signal and cyclic shift of the first reference signal.