System and scheme of scalable OFDM numerology
For a wireless communications system, scalable orthogonal frequency division multiplexing (OFDM) numerology is incorporated in a manner that can apply to radio link transmissions in future wireless network for frequency division duplex (FDD) and time division duplex (TDD) communications.
1. A method comprising:
receiving, by a user equipment (UE), an indication of a subcarrier spacing associated with a transmission time unit (TTU); and
transmitting or receiving, by the UE, an orthogonal frequency division multiplexing (OFDM) signal according to the subcarrier spacing and the TTU,
wherein the TTU comprises a fixed additional cyclic prefix (CP) duration and a number of consecutive scalable symbol durations, each scalable symbol duration having a same time length, and each scalable symbol duration comprising a CP part and a useful OFDM signal part, and the number of consecutive scalable symbol durations is a 2 n multiple of 7 and the subcarrier spacing is the 2 n multiple of 15 kHz, where n is a positive integer, and a time length of the fixed additional CP duration is equal to 16*1/30.72 μs.
2. The method of claim 1 , wherein the subcarrier spacing is 30 kHz and the TTU comprises the fixed additional CP duration and fourteen consecutive scalable symbol durations.
3. The method of claim 2 , wherein the TTU comprises fourteen symbols, the first symbol of the fourteen symbols comprising the fixed additional CP duration and a first scalable symbol duration of the fourteen consecutive scalable symbol durations, and each remaining symbol of the fourteen symbols comprising a respective scalable symbol duration of the fourteen consecutive scalable symbol durations.
4. The method of claim 1 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the fixed additional CP duration and twenty-eight consecutive scalable symbol durations.
5. The method of claim 4 , wherein the TTU comprises twenty-eight symbols, the first symbol of the twenty-eight symbols comprising the fixed additional CP duration and a first scalable symbol duration of the twenty-eight consecutive scalable symbol durations, and each remaining symbol of the twenty-eight symbols comprising a respective scalable symbol duration of the twenty-eight consecutive scalable symbol durations.
6. The method of claim 1 , wherein a time length of the TTU is 0.5 ms.
7. The method of claim 6 , wherein the TTU is a first TTU, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, the second TTU associated with a 15 kHz subcarrier spacing, and the second TTU comprising the fixed additional CP duration and 7 consecutive scalable symbol durations, each of the 7 scalable symbol durations having a same time length and each of the 7 scalable symbol durations comprising a second CP part and a second useful OFDM signal part.
8. A user equipment comprising:
a memory storing instructions; and
a processor configured, by the instructions, to:
receive an indication of a subcarrier spacing associated with a transmission time unit (TTU); and
transmit or receive an orthogonal frequency division multiplexing (OFDM) signal according to the subcarrier spacing and the TTU,
wherein the TTU comprises a fixed additional cyclic prefix (CP) duration and a number of consecutive scalable symbol durations, each scalable symbol duration having a same time length, and each scalable symbol duration comprising a CP part and a useful OFDM signal part, and the number of consecutive scalable symbol durations is a 2 n multiple of 7 and the subcarrier spacing is the 2 n multiple of 15 kHz, where n is a positive integer, and a time length of the fixed additional CP duration is equal to 16*1/30.72 μs.
9. The user equipment of claim 8 , wherein the subcarrier spacing is 30 kHz and the TTU comprises the fixed additional CP duration and fourteen consecutive scalable symbol durations.
10. The user equipment of claim 9 , wherein the TTU comprises fourteen symbols, the first symbol of the fourteen symbols comprising the fixed additional CP duration and a first scalable symbol duration of the fourteen consecutive scalable symbol durations, and each remaining symbol of the fourteen symbols comprising a respective scalable symbol duration of the fourteen consecutive scalable symbol durations.
11. The user equipment of claim 8 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the fixed additional CP duration and twenty-eight consecutive scalable symbol durations.
12. The user equipment of claim 11 , wherein the TTU comprises twenty-eight symbols, the first symbol of the twenty-eight symbols comprising the fixed additional CP duration and a first scalable symbol duration of the twenty-eight consecutive scalable symbol durations, and each remaining symbol of the twenty-eight symbols comprising a respective scalable symbol duration of the twenty-eight consecutive scalable symbol durations.
13. The user equipment of claim 8 , wherein a time length of the TTU is 0.5 ms.
14. The user equipment of claim 13 , wherein the TTU is a first TTU, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, the second TTU associated with a 15 kHz subcarrier spacing, and the second TTU comprising the fixed additional CP duration and 7 consecutive scalable symbol durations, each of the 7 scalable symbol durations having a same time length and each of the 7 scalable symbol durations comprising a second CP part and a second useful OFDM signal part.
15. A method comprising:
transmitting, by a network device, an indication of a subcarrier spacing associated with a transmission time unit (TTU), to a user equipment (UE); and
transmitting or receiving, by the network device with the UE, an orthogonal frequency division multiplexing (OFDM) signal according to the subcarrier spacing and the TTU,
wherein the TTU comprises a fixed additional cyclic prefix (CP) duration and a number of consecutive scalable symbol durations, each scalable symbol duration having a same time length, and each scalable symbol duration comprising a CP part and a useful OFDM signal part, and the number of consecutive scalable symbol durations is a 2 n multiple of 7 and the subcarrier spacing is the 2 n multiple of 15 kHz, where n is a positive integer, and a time length of the fixed additional CP duration is equal to 16*1/30.72 μs.
16. The method of claim 15 , wherein the subcarrier spacing is 30 kHz, and the TTU comprises the fixed additional CP duration and fourteen consecutive scalable symbol durations.
17. The method of claim 16 , wherein the TTU comprises fourteen symbols, the first symbol of the fourteen symbols comprising the fixed additional CP duration and a first scalable symbol duration of the fourteen consecutive scalable symbol durations, and each remaining symbol of the fourteen symbols comprising a respective scalable symbol duration of the fourteen consecutive scalable symbol durations.
18. The method of claim 15 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the fixed additional CP duration and twenty-eight consecutive scalable symbol durations.
19. The method of claim 18 , wherein the TTU comprises twenty-eight symbols, the first symbol of the twenty-eight symbols comprising the fixed additional CP duration and a first scalable symbol duration of the twenty-eight consecutive scalable symbol durations, and each remaining symbol of the twenty-eight symbols comprising a respective scalable symbol duration of the twenty-eight consecutive scalable symbol durations.
20. The method of claim 15 , wherein a time length of the TTU is 0.5 ms.
21. The method of claim 20 , wherein the TTU is a first TTU, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, the second TTU associated with a 15 kHz subcarrier spacing, and the second TTU comprising the fixed additional CP duration and 7 consecutive scalable symbol durations, each of the 7 scalable symbol durations having a same time length and each of the 7 scalable symbol durations comprising a second CP part and a second useful OFDM signal part.
22. A network device comprising:
a memory storing instructions; and
a processor configured, by the instructions, to:
transmit an indication of a subcarrier spacing associated with a transmission time unit (TTU) to a user equipment (UE); and
transmit or receive an orthogonal frequency division multiplexing (OFDM) signal according to the subcarrier spacing and the TTU,
wherein the TTU comprises a fixed additional cyclic prefix (CP) duration and a number of consecutive scalable symbol durations, each scalable symbol duration having a same time length, and each scalable symbol duration comprising a CP part and a useful OFDM signal part, and the number of consecutive scalable symbol durations is a 2 n multiple of 7 and the subcarrier spacing is the 2 n multiple of 15 kHz, where n is a positive integer, and a time length of the fixed additional CP duration is equal to 16*1/30.72 μs.
23. The network device of claim 22 , wherein the subcarrier spacing is 30 kHz and the TTU comprises the fixed additional CP duration and fourteen consecutive scalable symbol durations.
24. The network device of claim 23 , wherein the TTU comprises fourteen symbols, the first symbol of the fourteen symbols comprising the fixed additional CP duration and a first scalable symbol duration of the fourteen consecutive scalable symbol durations, and each remaining symbol of the fourteen symbols comprising a respective scalable symbol duration of the fourteen consecutive scalable symbol durations.
25. The network device of claim 22 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the fixed additional CP duration and twenty-eight consecutive scalable symbol durations.
26. The network device of claim 25 , wherein the TTU comprises twenty-eight symbols, the first symbol of the twenty-eight symbols comprising the fixed additional CP duration and a first scalable symbol duration of the twenty-eight consecutive scalable symbol durations, and each remaining symbol of the twenty-eight symbols comprising a respective scalable symbol duration of the twenty-eight consecutive scalable symbol durations.
27. The network device of claim 22 , wherein a time length of the TTU is 0.5 ms.
28. The network device of claim 22 , wherein the TTU is a first TTU, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, the second TTU associated with a 15 kHz subcarrier spacing, and the second TTU comprising the fixed additional CP duration and 7 consecutive scalable symbol durations, each of the 7 scalable symbol durations having a same time length and each of the 7 scalable symbol durations comprising a second CP part and a second useful OFDM signal part.