System and scheme of scalable OFDM numerology

Patent metadata

Field	Value
Publication number	US-11632203-B2
Application number	US-202117410486-A
Country	US
Kind code	B2
Filing date	Aug 24, 2021
Priority date	Jun 1, 2015
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

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.

First claim

What is claimed is:

1. A method comprising:
receiving, by an apparatus, an indication of a subcarrier spacing associated with a transmission time unit, TTU; and
transmitting or receiving, by the apparatus, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2 n multiple of 15 kHz, where n is a positive integer and 2 n is a scaling factor, and
wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½ n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs, where ½ n is a reciprocal of the 2 n scaling factor, and
wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs.

2. The method of claim 1 , wherein the subcarrier spacing is 30 kHz and the TTU comprises the one long symbol duration and thirteen short symbol durations.

3. The method of claim 1 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the one long symbol duration and twenty-seven short symbol durations.

4. The method of claim 1 , wherein the TTU is a first TTU having a time length of 0.5 ms, and the subcarrier spacing is a first subcarrier spacing, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, and the second TTU is associated with a second subcarrier spacing different than the first subcarrier spacing.

5. The method of claim 4 , wherein the first TTU and the first subcarrier spacing are associated with a first frequency sub-band, and the second TTU and the second subcarrier spacing are associated with a second frequency sub-band different than the first frequency sub-band.

6. An apparatus 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 one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2 n multiple of 15 kHz, where n is a positive integer and 2 n is a scaling factor, and
wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½ n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs, where ½ n is a reciprocal of the 2 n scaling factor, and
wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs.

7. The apparatus of claim 6 , wherein the subcarrier spacing is 30 kHz and the TTU comprises the one long symbol duration and thirteen short symbol durations.

8. The apparatus of claim 6 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the one long symbol duration and twenty-seven short symbol durations.

9. The apparatus of claim 6 , wherein the TTU is a first TTU having a time length of 0.5 ms, and the subcarrier spacing is a first subcarrier spacing, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, and the second TTU is associated with a second subcarrier spacing different than the first subcarrier spacing.

10. The apparatus of claim 9 , wherein the first TTU and the first subcarrier spacing are associated with a first frequency sub-band, and the second TTU and the second subcarrier spacing are associated with a second frequency sub-band different than the first frequency sub-band.

11. A non-transitory computer readable medium storing instructions which, when the instructions are executed by a computer, cause the computer 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 one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2 n multiple of 15 kHz, where n is a positive integer and 2 n is a scaling factor, and
wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½ n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs, where ½ n is a reciprocal of the 2 n scaling factor, and
wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs.

12. A method comprising:
transmitting, by an apparatus, an indication of a subcarrier spacing associated with a transmission time unit, TTU, to a user equipment; and
transmitting or receiving, by the apparatus with the user equipment, an orthogonal frequency division multiplexing, OFDM, signal according to the subcarrier spacing and the TTU,
wherein the TTU comprises one long symbol duration and a plurality of short symbol durations, each short symbol duration having a same time length, and the subcarrier spacing is a 2 n multiple of 15 kHz, where n is a positive integer and 2 n is a scaling factor, and
wherein each short symbol duration comprises a respective short cyclic prefix, CP, part and a respective useful OFDM signal part, and the duration of each short CP part is a ½ n multiple of 144*1/30.72 μs, and the duration of each useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs, where ½ n is a reciprocal of the 2 n scaling factor, and
wherein the one long symbol duration comprises a long CP part and a useful OFDM signal part, and the duration of the long CP part is 16*1/30.72 μs larger than duration of the short CP part, and the duration of the useful OFDM signal part is the ½ n multiple of 2048*1/30.72 μs.

13. The method of claim 12 , wherein the subcarrier spacing is 30 kHz and the TTU comprises the one long symbol duration and thirteen short symbol durations.

14. The method of claim 12 , wherein the subcarrier spacing is 60 kHz and the TTU comprises the one long symbol duration and twenty-seven short symbol durations.

15. The method of claim 12 , wherein the TTU is a first TTU having a time length of 0.5 ms, and the subcarrier spacing is a first subcarrier spacing, and the first TTU is time-aligned with a second TTU having a time length of 0.5 ms, and the second TTU is associated with a second subcarrier spacing different than the first subcarrier spacing.

16. The method of claim 15 , wherein the first TTU and the first subcarrier spacing are a

Assignees

• Zhang Liqing
• Au Kelvin Kar Kin
• Ma Jianglei
• Tong Wen
• Islam Toufiqul
• Huawei Tech Co Ltd

Inventors

• Zhang Liqing
• Au Kelvin Kar Kin
• Ma Jianglei
• Tong Wen
• Islam Toufiqul

Classifications

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0007 Primary

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L27/26025

  Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003) · CPC title