Method for sending carrier information, base station, and terminal
Embodiments of this application provide a method for sending carrier information, and the method includes: performing, by a base station, subcarrier mapping on a first carrier in a first subcarrier mapping manner, where subcarriers corresponding to the first subcarrier mapping manner have frequency offset of a first offset value relative to subcarriers corresponding to a second subcarrier mapping manner, and the subcarriers corresponding to the second subcarrier mapping manner are symmetric with respect to a carrier center frequency of the first carrier, and include no subcarrier on the carrier center frequency of the first carrier; and sending, by the base station, indication information to a terminal, where the indication information carries information about the first offset value.
1. A method, comprising:
receiving, by a first device, indication information from a network device, wherein the indication information comprises information about a first offset value, and the first offset value is 7.5 KHz;
obtaining a second frequency of a carrier based on an absolute radio frequency channel number; and
obtaining a first frequency of the carrier by shifting the second frequency by the first offset value; and
wherein a relationship between the absolute radio frequency channel number and the second frequency is given by a relation as follows:
F UL =F UL_low +Y *( N UL −N Offs-UL ),
wherein F UL is the second frequency, N UL is the absolute radio frequency channel number, F UL_low is a lowest frequency value in a new radio (NR) frequency range, N Offs-UL is an offset value in the NR frequency range, and Y is a value greater than 0 and determined based on a NR channel raster.
2. The method according to claim 1 , wherein subcarriers of the carrier correspond to frequencies other than the second frequency.
3. The method according to claim 1 , wherein:
the second frequency is an original carrier center frequency of the carrier.
4. The method according to claim 1 , wherein the carrier is symmetric with respect to the first frequency of the carrier.
5. The method according to claim 1 , wherein the carrier comprises a subcarrier on the first frequency.
6. The method according to claim 1 , wherein:
the first frequency is an actual carrier center frequency of the carrier.
7. The method according to claim 1 , wherein the carrier is an uplink carrier.
8. The method according to claim 1 , wherein the indication information is carried in a system message or radio resource control (RRC) signaling.
9. The method according to claim 1 , wherein:
the second frequency is a carrier center frequency of the carrier before the shifting.
10. The method according to claim 1 , wherein:
the first frequency is a carrier center frequency of the carrier after shifting is performed.
11. A non-transitory computer-readable storage medium, comprising an instruction, wherein when running on a computer, the instruction enables the computer to perform the method according to claim 1 .
12. A method, comprising:
generating, by a network device, indication information comprising information about a first offset value, wherein the first offset value is 7.5 KHz, the first offset value is usable to obtain a first frequency of a carrier, and the carrier corresponds to an absolute radio frequency channel number; and
sending, by the network device, the indication information to a first device;
wherein the first frequency is obtained by shifting a second frequency of the carrier by the first offset value, and the second frequency is obtained based on the absolute radio frequency channel number; and
wherein a relationship between the absolute radio frequency channel number and the second frequency is given by a relation as follows:
F UL =F UL_low +Y *( N UL −N Offs-UL ),
wherein F UL is the second frequency, N UL is the absolute radio frequency channel number, F UL_low is a lowest frequency value in a new radio (NR) frequency range, N Offs-UL is an offset value in the NR frequency range, and Y is a value greater than 0 and determined based on a NR channel raster.
13. The method according to claim 12 , wherein subcarriers of the carrier correspond to frequencies other than the second frequency.
14. The method according to claim 12 , wherein:
the second frequency is an original carrier center frequency of the carrier.
15. The method according to claim 12 , wherein the carrier is symmetric with respect to the first frequency of the carrier.
16. The method according to claim 12 , wherein the carrier comprises a subcarrier on the first frequency.
17. The method according to claim 12 , wherein:
the first frequency is an actual carrier center frequency of the carrier.
18. The method according to claim 12 , wherein the carrier is an uplink carrier.
19. The method according to claim 12 , wherein the indication information is carried in a system message or radio resource control (RRC) signaling.
20. The method according to claim 12 , wherein:
the second frequency is a carrier center frequency of the carrier before the shifting.
21. The method according to claim 12 , wherein:
the first frequency is a carrier center frequency of the carrier after a shifting is performed.
22. A non-transitory computer-readable storage medium, comprising an instruction, wherein when running on a computer, the instruction enables the computer to perform the method according to claim 12 .
23. A device, comprising:
a transceiver, configured to receive indication information from a network device, wherein the indication information comprises information about a first offset value, and the first offset value is 7.5 KHz;
a processor coupled to the transceiver; and
a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:
obtaining a second frequency of a carrier based on an absolute radio frequency channel number; and
obtaining a first frequency of the carrier by shifting the second frequency by the first offset value;
wherein a relationship between the absolute radio frequency channel number and the second frequency is given by a relation as follows:
F UL =F UL_low +Y *( N UL −N Offs-UL ),
wherein F UL is the second frequency, N UL is the absolute radio frequency channel number, F UL_low is a lowest frequency value in a new radio (NR) frequency range, N Offs-UL is an offset value in the NR frequency range, and Y is a value greater than 0 and determined based on a NR channel raster.
24. The device according to claim 23 , wherein subcarriers of the carrier are located on frequencies other than the second frequency.
25. The device according to claim 23 , wherein the carrier is symmetric with respect to the first frequency of the carrier.
26. The device according to claim 23 , wherein the carrier comprises a subcarrier on the first frequency.
27. A network device, comprising:
a processor;
a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:
generating indication information comprising information about a first offset value, wherein the first offset value is 7.5 KHz, the first offset value is usable to obtain a first frequency of a carrier, and the carrier corresponds to an absolute radio frequency channel number; and
a transceiver coupled to the processor, wherein the transceiver is configured to send the indication information to a first device;
wherein the first frequency is obtainable by shifting a second frequency of the carrier by the first offset value, and the second frequency is obtainable based on the absolute radio frequency channel number; and
wherein a relationship between the absolute radio frequency channel number and the second frequency is given by a relation as follows:
F UL =F UL_low +Y *( N UL −N Offs-UL ),
wherein F UL is the second frequency, N UL is the absolute radio frequency channel number, F UL_low is a lowest frequency value in a new radio (NR) frequency range, N Offs-UL is an offset value in the NR frequency range, and Y is a value greater than 0 and determined based on a NR channel raster.
28. The network device according to claim 27 , wherein subcarriers of the carrier are located on frequencies other than the second frequency.
29. The network device according to claim 27 , wherein the carrier is symmetric with respect to a first frequency of the carrier.
30. The network device according to claim 27 , wherein the carrier comprises a subcarrier on the first frequency.