Communication method and communications apparatus
The communication method and the communications apparatus may be applied to the internet of vehicles, for example, V2X, LTE-V, and V2V. The method includes: A first terminal apparatus determines a scaling factor based on a subcarrier spacing of a first time-frequency resource to be used to send first data and/or a quantity of slots occupied by the first time-frequency resource. The first data is to-be-sent data of the first terminal apparatus, and the first time-frequency resource occupies a single slot or a plurality of consecutive slots. Then, the first terminal apparatus determines, based on the scaling factor, a size of a transmission block carrying the first data, and sends the transmission block carrying the first data to a second terminal apparatus on the first time-frequency resource.
1. A communication method, comprising:
mapping, by a first terminal apparatus, first data to M symbols in a slot, wherein the M symbols are consecutive symbols in the slot, the first data is mapped to symbols that are from the 2 nd symbol in the M symbols to the last symbol in the M symbols, and resource elements in the 2 nd symbol in the M symbols to which the first data is mapped are duplicated in the 1 st symbol in the M symbols, and wherein the 1 st symbol in the M symbols is to be used to perform automatic gain control; and
sending, by the first terminal apparatus, the first data on the M symbols to a second terminal apparatus.
2. The method according to claim 1 , wherein the M symbols are consecutive symbols that are available for sending sidelink data in the slot.
3. The method according to claim 1 , wherein the last symbol in the M symbols is before the last symbol in the slot.
4. The method according to claim 1 , further comprising:
performing, by the first terminal apparatus on the M symbols, rate matching on the first data.
5. The method according to claim 1 , wherein the M symbols are symbols that are from symbol o to symbol 13 in the slot, from symbol o to symbol 12 in the slot, from symbol 5 to symbol 13 in the slot, from symbol o to symbol 8 in the slot, from symbol 7 to symbol 13 in the slot, from symbol o to symbol 6 in the slot, from symbol o to symbol 5 in the slot, or from symbol 7 to symbol 12 in the slot.
6. A communications apparatus, comprising:
one or more processors, configured to:
map first data to M symbols in a slot, wherein the M symbols are consecutive symbols in the slot, the first data is mapped to symbols that are from the 2 nd symbol in the M symbols to the last symbol in the M symbols, and resource elements in the 2 nd symbol in the M symbols to which the first data is mapped are duplicated in the 1 st symbol in the M symbols, and wherein the 1 st symbol in the M symbols is to be used to perform automatic gain control; and
send the first data on the M symbols.
7. The apparatus according to claim 6 , wherein the M symbols are consecutive symbols that are available for sending sidelink data in the slot.
8. The apparatus according to claim 6 , wherein the last symbol in the M symbols is before the last symbol in the slot.
9. The apparatus according to claim 6 , wherein the one or more processors are further configured to perform, on the M symbols, rate matching on the first data.
10. The apparatus according to claim 6 , wherein the M symbols are symbols that are from symbol o to symbol 13 in the slot, from symbol o to symbol 12 in the slot, from symbol 5 to symbol 13 in the slot, from symbol o to symbol 8 in the slot, from symbol 7 to symbol 13 in the slot, from symbol o to symbol 6 in the slot, from symbol o to symbol 5 in the slot, or from symbol 7 to symbol 12 in the slot.
11. A communication method, comprising:
receiving, by a second terminal apparatus, a first data in a slot, wherein the slot comprises M consecutive symbols, the first data is mapped to symbols that are from the 2 nd symbol in the M symbols to the last symbol in the M symbols, and resource elements in the 2 nd symbol in the M symbols to which the first data is mapped are duplicated in the 1 st symbol in the M symbols, and wherein the 1 st symbol in the M symbols is to be used to perform automatic gain control; and
demodulating, by the second terminal apparatus, the first data.
12. The method according to claim 11 , wherein the M symbols are consecutive symbols that are available for sending sidelink data in the slot.
13. The method according to claim 11 , wherein the last symbol in the M symbols is before the last symbol in the slot.
14. The method according to claim 11 , wherein the M symbols are symbols that are from symbol o to symbol 13 in the slot, from symbol o to symbol 12 in the slot, from symbol 5 to symbol 13 in the slot, from symbol o to symbol 8 in the slot, from symbol 7 to symbol 13 in the slot, from symbol o to symbol 6 in the slot, from symbol o to symbol 5 in the slot, or from symbol 7 to symbol 12 in the slot.
15. The apparatus according to claim 11 , wherein the 1 st symbol in the M symbols is symbol o, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, symbol 6, or symbol 7 in the slot.
16. A communications apparatus, comprising:
one or more processors, configured to:
receive a first data in a slot, wherein the slot comprises M consecutive symbols, the first data is mapped to symbols that are from the 2 nd symbol in the M symbols to the last symbol in the M symbols, and resource elements in the 2 nd symbol in the M symbols to which the first data is mapped are duplicated in the 1 st symbol in the M symbols, and wherein the 1 st symbol in the M symbols is to be used to perform automatic gain control; and
demodulate the first data.
17. The apparatus according to claim 16 , wherein the M symbols are consecutive symbols that are available for sending sidelink data in the slot.
18. The apparatus according to claim 16 , wherein the last symbol in the M symbols is before the last symbol in the slot.
19. The apparatus according to claim 16 , wherein the M symbols are symbols that are from symbol o to symbol 13 in the slot, from symbol o to symbol 12 in the slot, from symbol 5 to symbol 13 in the slot, from symbol o to symbol 8 in the slot, from symbol 7 to symbol 13 in the slot, from symbol o to symbol 6 in the slot, from symbol o to symbol 5 in the slot, or from symbol 7 to symbol 12 in the slot.
20. The apparatus according to claim 16 , wherein the 1 st symbol in the M symbols is symbol o, symbol 1, symbol 2, symbol 3, symbol 4, symbol 5, symbol 6, or symbol 7 in the slot.