System and scheme of scalable OFDM numerology

Patent metadata

Field	Value
Publication number	US-10038581-B2
Application number	US-201615169553-A
Country	US
Kind code	B2
Filing date	May 31, 2016
Priority date	Jun 1, 2015
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

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 for configuring communications, with a communication device, using orthogonal frequency division multiplexing (OFDM), the method comprising:
receiving an indication of a first parameter for a value of a first subcarrier spacing and a value of a first sub-frame duration for a first type of numerology signal to be applied to a first sub-frame of OFDM symbols; and
transmitting a signal configured according to the first type of numerology signal on a first frequency sub-band;
wherein the value of the first subcarrier spacing has scaled relationship to a value of a second subcarrier spacing and the value of the first sub-frame duration has a scaled relationship to a value of a second sub-frame duration, the second subcarrier spacing and the second sub-frame duration for a second type of numerology signal to be applied to a second sub-frame of OFDM symbols, wherein the scaled relationship of the value of the first subcarrier spacing to the second subcarrier spacing involves multiplication by a first scaling factor, and the scaled relationship of the value of the first sub-frame duration to the second sub-frame duration involves multiplication by a second scaling factor, and wherein the first scaling factor is a reciprocal of the second scaling factor, and wherein the first subcarrier spacing or the second subcarrier spacing is one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz.

2. The method of claim 1 further comprising receiving an indication of a second parameter for the value of the second subcarrier spacing and the value of the second sub-frame duration, and transmitting a signal configured according to the second type of numerology signal on a second frequency sub-band concurrently with the transmitting of the signal configured according to the first type of numerology signal on the first frequency sub-band.

3. The method of claim 2 wherein the first sub-frame duration comprises a sum of the duration of an OFDM symbol useful part and a cyclic prefix part for all of the OFDM symbols in the first sub-frame, and the second sub-frame duration comprises a sum of the duration of an OFDM symbol useful part and a cyclic prefix part for all of the OFDM symbols in the second sub-frame, and the method comprises receiving the indication of the first parameter for a value of a first cyclic prefix duration for the first type of numerology signal and receiving the indication of the second parameter for a value of a second cyclic prefix duration to be applied to the second for the first type of numerology signal, wherein the first cyclic prefix duration has a scaled relationship to the value of the second cyclic prefix duration.

4. The method of claim 2 , wherein the first sub-frame and second sub-frame are each transmitted in a first frequency sub-band, the method further comprising:
receiving an indication of a third parameter for a value of a third subcarrier spacing, and a value of a third sub-frame duration for a third type of numerology signal to be applied to a third sub-frame of OFDM symbols, wherein the third sub-frame duration is an integer multiple of one or both of the first and second sub-frame durations, and the third sub-frame is transmitted in a second frequency sub-band concurrently with the first or second sub-frames.

5. A user equipment configured for orthogonal frequency division multiplexing (OFDM), the user equipment comprising:
a memory storing instructions; and
a processor configured, by the instructions, to:
receive an indication of a first parameter for a value of a first subcarrier spacing and a value of a first sub-frame duration for a first type of numerology signal; and
transmit a signal configured according to the first type of numerology signal on a first frequency sub-band;
wherein the value of the first subcarrier spacing has scaled relationship to a value of a second subcarrier spacing and the value of the first sub-frame duration has a scaled relationship to a value of a second sub-frame duration, the second subcarrier spacing and the second sub-frame duration for a second type of numerology signal to be applied to a second sub-frame of OFDM symbols, wherein the scaled relationship of the value of the first subcarrier spacing to the second subcarrier spacing involves multiplication by a first scaling factor and the scaled relationship of the value of the first sub-frame duration to the second sub-frame duration involves multiplication by a second scaling factor, and wherein the first scaling factor is a reciprocal of the second scaling factor, and wherein the first subcarrier spacing or the second subcarrier spacing is one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, or 240 kHz.

6. The user equipment of claim 5 wherein the processor is further configured, by the instructions, to receive an indication of a second parameter for the value of the second subcarrier spacing and the value of the second sub-frame duration, and to transmit a signal configured according to the second type of numerology signal on a second frequency sub-band concurrently with the transmitting the signal configured according to the first type of numerology signal on the first frequency sub-band.

7. The user equipment of claim 6 wherein the first numerology signal and second numerology signal each have a defined number of OFDM symbols in a sub-frame, the first sub-frame duration comprises a sum of the duration of an OFDM symbol useful part and a cyclic prefix part for all of the OFDM symbols in the first sub-frame.

8. The user equipment of claim 7 wherein the processor is configured to receive the indication of the first parameter for a value of a first cyclic prefix duration for the first type of numerology signal and to receive the indication of the second parameter for a value of a second cyclic prefix duration to be applied to the second for the first type of numerology signal, wherein the first cyclic prefix duration has a scaled relationship to the value of the second cyclic prefix duration.

9. The user equipment of claim 6 wherein the first sub-frame and second sub-frame are each transmitted in a first frequency sub-band, the processor being further configured to:
receive an indication of a third parameter for a value of a third subcarrier spacing, and a value of a third sub-frame duration for a third type of numerology signal to be applied to a third sub-frame of OFDM symbols, wherein the third sub-frame duration is an integer multiple of one or both of the first and second sub-frame durations, and the third sub-frame is transmitted in a second frequency sub-band concurrently with the first or second sub-frames.

10. A method for configuring communications, with a communication device, using orthogonal frequency division multiplexing (OFDM), the method comprising:
transmitting an indication of a first parameter for a value of a first subcarrier spacing and a value of a first sub-frame duration for a first type of numerology signal; and
receiving a signal configured according to the first type of numerology signal on a first frequency sub-band;
wherein the value of the first subcarrier spacing has scaled relationship to a value of a second subcarrier spacing and the value of the first sub-frame duration has a scaled relationship to a value of a second sub-frame duration, the second subcarrier spacing and the second sub-frame duration for a second type of numerology signal to be applied to a second sub-frame of OFDM symbols, wherein the scaled relationship of the value of the first subcarrier spacing to the second subcarrier spacing involves multiplication by a first scaling factor and the scaled relationship of the value of the first sub-frame duration to the second sub-frame duration involves mult

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

• H04W72/23

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

• H04L27/2646

  using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length · CPC title

• H04L27/2602 Primary

  Signal structure · 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