Signal transmission method and apparatus
In a signal transmission method, a user equipment receives a first signal from a wireless network device; and the user equipment determines spatial information of a to-be-transmitted second signal based on the first signal, and transmits the to-be-transmitted second signal by using the spatial information. An uplink transmit beam is determined by using related information of a downlink receive beam, so that the UE can efficiently determine spatial information of an uplink signal to be transmitted by the UE.
1. A signal transmission method comprising:
receiving, by a user equipment (UE), indication information from a second wireless network device, wherein the indication information indicates that spatial information of a first signal is a reference for spatial information of an uplink control signal, wherein the first signal comprises: a non-zero-power reference signal for obtaining channel state information or a synchronization signal;
receiving, by the UE, the first signal from the second wireless network device;
determining, by the UE, the spatial information of the uplink control signal according to the spatial information of the received first signal; and
transmitting, by the UE, the uplink control signal according to the determined spatial information of the uplink control signal.
2. The method according to claim 1 , wherein the indication information comprises an identifier of the first signal.
3. The method according to claim 1 , wherein the indication information is carried in radio resource control (RRC) signaling.
4. The method according to claim 1 , further comprising:
determining spatial information of an uplink data signal to be transmitted by the UE according to the spatial information of the uplink control signal.
5. The method according to claim 4 , further comprising:
determining a transmit power of the uplink data signal to be transmitted by the UE based on a received power of the first signal.
6. The method according to claim 5 , wherein determining the transmit power of the uplink data signal based on the received power of the first signal comprises:
receiving information indicating a transmit power of the first signal, wherein the information is carried in an information element in radio resource control (RRC) signaling;
receiving the first signal, and measuring and obtaining the received power of the first signal;
obtaining a path loss of the first signal based on the received power of the first signal and the transmit power of the first signal, wherein the path loss is equal to a difference between the transmit power and a filtered reference signal received power; and
determining, based on the path loss or an open-loop control parameter related to the path loss, an uplink transmit power for transmitting the uplink data signal.
7. An apparatus comprising a processor, coupled with a memory, wherein the processor is configured to execute instructions stored in the memory to cause the apparatus to perform:
receiving indication information from a second wireless network device, wherein the indication information indicates that spatial information of a first signal is a reference for spatial information of an uplink control signal, wherein the first signal comprises: a non-zero-power reference signal for obtaining channel state information or a synchronization signal;
receiving the first signal from the second wireless network device;
determining the spatial information of the uplink control signal according to the spatial information of the received first signal; and
transmitting the uplink control signal according to the determined spatial information of the uplink control signal.
8. The apparatus according to claim 7 , wherein the indication information comprises an identifier of the first signal.
9. The apparatus according to claim 7 , wherein the indication information is carried in radio resource control (RRC) signaling.
10. The apparatus according to claim 7 , wherein the processor is further configured to execute instructions stored in the memory to cause the apparatus to perform:
determining spatial information of a to-be-transmitted uplink data signal according to the spatial information of the uplink control signal.
11. The apparatus according to claim 10 , wherein the processor is further configured to execute instructions stored in the memory to cause the apparatus to perform:
determining a transmit power of the to-be-transmitted uplink data signal based on a received power of the first signal.
12. The apparatus according to claim 11 , wherein determining the transmit power of the to-be-transmitted uplink data signal based on the received power of the first signal comprises:
receiving information indicating a transmit power of the first signal, wherein the information is carried in an information element in radio resource control (RRC) signaling;
measuring and obtaining the received power of the first signal;
obtaining a path loss of the first signal based on the received power of the first signal and the transmit power of the first signal, wherein the path loss is equal to a difference between the transmit power and a filtered reference signal received power; and
determining, based on the path loss or an open-loop control parameter related to the path loss, an uplink transmit power for transmitting the uplink data signal.
13. A non-transitory processor-readable storage medium having processor-executable instructions stored thereon, wherein the processor-executable instructions, when executed, facilitate:
receiving indication information from a second wireless network device, wherein the indication information indicates that spatial information of a first signal is a reference for spatial information of an uplink control signal, wherein the first signal comprises: a non-zero-power reference signal for obtaining channel state information or a synchronization signal;
receiving the first signal from the second wireless network device;
determining the spatial information of the uplink control signal according to the spatial information of the received first signal; and
transmitting the uplink control signal according to the determined spatial information of the uplink control signal.
14. The non-transitory processor-readable storage medium according to claim 13 , wherein the indication information comprises an identifier of the first signal.
15. The non-transitory processor-readable storage medium according to claim 13 , wherein the indication information is carried in radio resource control (RRC) signaling.
16. The non-transitory processor-readable storage medium according to claim 13 , wherein the processor-executable instructions, when executed, further facilitate:
determining spatial information of a to-be-transmitted uplink data signal according to the spatial information of the uplink control signal.
17. The non-transitory processor-readable storage medium according to claim 16 , wherein the processor-executable instructions, when executed, further facilitate:
determining a transmit power of the to-be-transmitted uplink data signal based on a received power of the first signal.
18. The non-transitory processor-readable storage medium according to claim 17 , wherein determining the transmit power of the to-be-transmitted uplink data signal based on the received power of the first signal comprises:
receiving information indicating a transmit power of the first signal, wherein the information is carried in an information element in radio resource control (RRC) signaling;
measuring and obtaining the received power of the first signal;
obtaining a path loss of the first signal based on the received power of the first signal and the transmit power of the first signal, wherein the path loss is equal to a difference between the transmit power and a filtered reference signal received power; and
determining, based on the path loss or an open-loop control parameter related to the path loss, an uplink transmit power for transmitting the uplink data signal.