System and Method of Waveform Design for Operation Bandwidth Extension

Patent metadata

Field	Value
Publication number	US-2016294498-A1
Application number	US-201514932857-A
Country	US
Kind code	A1
Filing date	Nov 4, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Different numerologies may be used to communicate orthogonal frequency division multiplexing (OFDM)-based signals over different frequency sub-bands of a given carrier. This may allow the OFDM-based signals to efficiently support diverse traffic types. In some embodiments, the numerology of OFDM-based signal depends on a bandwidth of the frequency sub-band over which the OFDM-based signals are transmitted. In some embodiments, the OFDM-based signals are filtered OFDM (f-OFDM) signals, and the pulse shaping digital filter used to generate the f-OFDM signals allows the receiver to mitigate interference between adjacent f-OFDM signals upon reception, thereby allowing f-OFDM signals to be communicated over consecutive carriers without relying on a guard band.

First claim

What is claimed is:

1 . A method for transmitting signals, the method comprising:
transmitting, by a transmit point, a first orthogonal frequency division multiplexing (OFDM)-based signal over a first frequency sub-band of a carrier and a second OFDM-based signal over a second frequency sub-band of the carrier, the first frequency sub-band having a first bandwidth and a first numerology based on the first bandwidth, the second frequency sub-band having a second bandwidth and a second numerology based on the second bandwidth.

2 . The method of claim 1 , wherein the first numerology is different than the second numerology.

3 . The method of claim 1 , wherein the first OFDM-based signal and the second OFDM-base signal are filtered orthogonal frequency division multiplexed (f-OFDM) signals.

4 . The method of claim 3 , wherein a first filter associated with the first OFDM-based signal contains at least the first frequency sub-band, and a second filter associated with the second OFDM-based signal contains at least the second frequency sub-band.

5 . The method of claim 1 , wherein the first OFDM-based signal and the second OFDM-base signal are single carrier frequency division multiple access (SC-FDMA) signals.

6 . The method of claim 1 , wherein transmitting the first OFDM-based signal over the first frequency sub-band of the carrier and the second OFDM-based signal over the second frequency sub-band of the carrier comprises:
transmitting a first OFDM-based symbol over the first frequency sub-band of the carrier and a second OFDM-based symbol over the second frequency sub-band of the carrier, the first OFDM-based symbol being communicated during the same time period as the second OFDM-based symbol.

7 . The method of claim 1 , wherein the first numerology of the first frequency band is different than the second numerology of the second frequency band such that the first OFDM-based signal is communicated in accordance with at least one different physical layer parameter than the second OFDM-based signal.

8 . The method of claim 7 , wherein the first OFDM-based signal is communicated in accordance with a different transmission time interval (TTI) than the second OFDM-based signal.

9 . The method of claim 7 , wherein the first OFDM-based signal carries symbols having a different symbol duration than symbols carried by the second OFDM-based signal.

10 . The method of claim 7 , wherein the first OFDM-based signal carries symbols having a different cyclic prefix (CP) length than symbols carried by the second OFDM-based signal.

11 . The method of claim 7 , wherein the first OFDM-based signal and the second OFDM-based signal are communicated over sub-carriers that have a different sub-carrier spacing than one another.

12 . The method of claim 7 , wherein numerologies of the first frequency band and the second frequency band are based on bandwidths of the respective frequency bands, the first frequency band having a different bandwidth than the second frequency band.

13 . The method of claim 7 , wherein the first frequency band and the second frequency band have the same bandwidth.

14 . The method of claim 1 , wherein the first frequency band and the second frequency band are separated by a guard band that is less than or equal to twenty multiples of a sub-carrier spacing of one of the first frequency band and the second frequency band.

15 . The method of claim 14 , wherein the guard band is less than or equal to ten multiples of the sub-carrier spacing of one of the first frequency band and the second frequency band.

16 . The method of claim 14 , wherein the guard band is less than or equal to five multiples of the sub-carrier spacing of one of the first frequency band and the second frequency band.

17 . The method of claim 14 , wherein the guard band is less than or equal to three multiples of the sub-carrier spacing of one of the first frequency band and the second frequency band.

18 . The method of claim 14 , wherein the guard band is equal to the sub-carrier spacing of one of the first frequency band and the second frequency band.

19 . The method of claim 1 , wherein the first frequency band and the second frequency band are contiguous in the frequency domain such that the first frequency band and the second frequency band are not separated by a guard band.

20 . The method of claim 19 , wherein the first frequency band and the second frequency band have different bandwidths.

21 . The method of claim 1 , wherein the method further comprises aggregating the first OFDM-based signal and the second OFDM-based signal into one signal spanning both the first frequency band and the second frequency band prior to transmitting the first OFDM-based signal and the second OFDM-based signal.

22 . The method of claim 21 , wherein a bandwidth of the frequency band is equal to or greater than 40 megahertz (MHz).

23 . A transmit point comprising:
a processor; and a computer readable storage medium storing programming for execution by the processor, the programming including instructions to: transmit a first orthogonal frequency division multiplexing (OFDM)-based signal over a first frequency sub-band of a carrier and a second OFDM-based signal over a second frequency sub-band of the carrier, the first frequency sub-band having a first bandwidth and a first numerology based on the first bandwidth, the second frequency sub-band having a second bandwidth and a second numerology based on the second bandwidth.

24 . A method for receiving signals, the method comprising:
receiving, by a receive point, a first orthogonal frequency division multiplexing (OFDM)-based signal over a first frequency sub-band of a carrier and a second OFDM-based signal over a second frequency sub-band of the carrier, the first frequency sub-band having a first bandwidth and a first numerology based on the first bandwidth, the second frequency sub-band having a second bandwidth and a second numerology based on the second bandwidth.

25 . The method of claim 24 , wherein the first numerology is different than the second numerology.

26 . The method of claim 24 , wherein the first OFDM-based signal and the second OFDM-base signal are filtered orthogonal frequency division multiplexed (f-OFDM) signals.

27 . The method of claim 26 , wherein a first filter associated with the first OFDM-based signal contains at least the first frequency sub-band, and a second filter associated with the second OFDM-based signal contains at least the second frequency sub-band.

28 . The method of claim 24 , wherein the first OFDM-based signal and the second OFDM-base signal are single carrier frequency division multiple access (SC-FDMA) signals.

29 . The method of claim 24 , wherein receiving the first OFDM-based signal over the first frequency sub-band of the carrier and the second OFDM-based signal over the second frequency sub-band of the carrier comprises:
receiving a first OFDM-based symbol over the first frequency sub-band of the carrier and a second OFDM-based symbol over the second frequency sub-band of the carrier, the first OFDM-based symbol being communicated during the same time period as the second OFDM-based symbol.

30 . The method of claim 24 , wherein the first numerology of the first frequency band is different than the seco

Assignees

• Huawei Tech Co Ltd

Inventors

• Ma Jianglei
• Jia Ming
• Zhang Liqing
• Au Kelvin Kar Kin

Classifications

• H04L27/2691

  involving interference determination or cancellation · CPC title

• H04L27/26534

  Pulse-shaped multi-carrier, i.e. not using rectangular window · CPC title

• H04L27/264

  Pulse-shaped multi-carrier, i.e. not using rectangular window · CPC title

• H04L27/26025 Primary

  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

• H04L25/03834

  using pulse shaping · CPC title