Wireless communications using flexible channel bandwidth

Patent metadata

Field	Value
Publication number	US-11223508-B1
Application number	US-202016916901-A
Country	US
Kind code	B1
Filing date	Jun 30, 2020
Priority date	Aug 2, 2004
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The disclosure relates in some aspects to providing a flexible channel bandwidth in a mobile radio communications network. For example, wherein a consecutive series of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers may be provisioned for uplink or downlink communications, a flexible frame structure may be provided by provisioning different subcarrier spacings for the consecutive series of OFDM subcarriers. The different subcarrier spacings may be used for transmitting and/or receiving OFDM signals.

First claim

The invention claimed is:

1. A method of communicating in a mobile radio communications network, comprising:
provisioning a consecutive series of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers for uplink or downlink communications;
provisioning a plurality of different selectable subcarrier spacings for the consecutive series of OFDM subcarriers;
performing discrete Fourier transform (DFT) coding on a plurality of data symbols to produce coded symbols;
performing an inverse-DFT on the coded symbols to produce a single-carrier frequency division multiple access signal that comprises a sum of the consecutive series of OFDM subcarriers; and
transmitting the single-carrier frequency division multiple access signal in the mobile radio communications network;
wherein provisioning the plurality of different selectable subcarrier spacings comprises providing the single-carrier frequency division multiple access signal with a particular one of a set of different symbol periods by selecting one of the plurality of different selectable subcarrier spacings.

2. The method of claim 1 , wherein at least one of the plurality of different selectable subcarrier spacings equals at least one other of the plurality of different selectable subcarrier spacings multiplied by a scaling factor that is a power of two.

3. The method of claim 1 , further comprising adding a cyclic prefix to the single-carrier frequency division multiple access signal prior to transmitting.

4. The method of claim 1 , wherein the plurality of different selectable subcarrier spacings are integer multiples of a first subcarrier spacing.

5. The method of claim 1 , wherein the provisioning the plurality of different selectable subcarrier spacings is configured for different deployment scenarios comprising different system requirements or different channel conditions.

6. The method of claim 1 , wherein each of the plurality of different subcarrier spacings provides a different number of symbols per frame.

7. The method of claim 1 , wherein the performing the inverse-DFT employs a discrete Fourier transform with a plurality of sampling rates that comprise harmonic frequencies.

8. The method of claim 1 , further comprising determining a delay spread in the mobile radio communication network; and based on the delay spread, employing a first numerology or a second numerology; wherein the first numerology comprises a first one of the plurality of different selectable subcarrier spacings, and the second numerology comprises a second one of the plurality of different selectable subcarrier spacings.

9. An apparatus for communicating in a mobile radio communications network, comprising:
a non-transitory computer-readable memory storing one or more instructions; and
at least one processor in communication with the non-transitory computer-readable memory; wherein the one or more instructions, when executed by the at least one processor, cause the at least one processor to:
provision a consecutive series of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers for uplink or downlink communications;
provision a plurality of different selectable subcarrier spacings for the consecutive series of OFDM subcarriers;
perform discrete Fourier transform (DFT) coding on a plurality of data symbols to produce DFT coded symbols;
perform an inverse-DFT on the coded symbols to produce a single-carrier frequency division multiple access signal that comprises a sum of the consecutive series of OFDM subcarriers; and
transmit the single-carrier frequency division multiple access signal in the mobile radio communications network;
wherein the one or more instructions cause the at least one processor to provide the single-carrier frequency division multiple access signal with one of a set of different selectable symbol periods by selecting one of the plurality of different selectable subcarrier spacings.

10. The apparatus of claim 9 , wherein at least one of the plurality of different selectable subcarrier spacings equals at least one other of the plurality of different selectable subcarrier spacings multiplied by a scaling factor that is a power of two.

11. The apparatus of claim 9 , further comprising one or more instructions, when executed by the at least one processor, cause the at least one processor to add a cyclic prefix to the single-carrier frequency division multiple access signal.

12. The apparatus of claim 9 , wherein the plurality of different selectable subcarrier spacings are integer multiples of a first subcarrier spacing.

13. The apparatus of claim 9 , wherein each of the plurality of different selectable subcarrier spacings is configured for one of a plurality of different deployment scenarios, the plurality of different deployment scenarios comprising different system requirements or different channel conditions.

14. The apparatus of claim 9 , wherein each of the plurality of different selectable subcarrier spacings provides a different number of symbols per frame.

15. The apparatus of claim 9 , wherein the inverse-DFT a plurality of sampling rates that comprise harmonic frequencies.

16. The apparatus of claim 9 , wherein the one or more instructions that cause the at least one processor to provide the single-carrier frequency division multiple access signal with one of a set of different selectable symbol periods determine a delay spread in the mobile radio communication network; and based on the delay spread, select a first numerology or a second numerology; wherein the first numerology comprises a first one of the plurality of different selectable subcarrier spacings, and the second numerology comprises a second one of the plurality of different selectable subcarrier spacings.

17. An apparatus for communicating in a mobile radio communications network, comprising:
a transceiver-control circuitry configured for:
provisioning a consecutive series of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers for uplink or downlink communications;
provisioning a plurality of different selectable subcarrier spacings for the consecutive series of OFDM subcarriers; and
performing discrete Fourier transform (DFT) coding on a plurality of data symbols to produce DFT coded symbols; and

an OFDM transceiver communicatively coupled to the transceiver-control circuitry and configured for:
performing an inverse-DFT on the coded symbols to produce a single-carrier frequency division multiple access signal that comprises a sum of the consecutive series of OFDM subcarriers; and
transmitting the single-carrier frequency division multiple access signal in the mobile radio communications network;

wherein provisioning the plurality of different selectable subcarrier spacings comprises providing the single-carrier frequency division multiple access signal with a particular one of a set of different symbol periods by selecting one of the plurality of different selectable subcarrier spacings.

18. The apparatus of claim 17 , wherein at least one of the plurality of different selectable subcarrier spacings equals at least one other of the plurality of different selectable subcarrier spacings multiplied by a scaling factor that is a power of two.

19. The apparatus of claim 17 , wherein the OFDM transceiver is further configured to add a cyclic prefix to the single-carrier frequency division multiple access signal.

20. The apparatus of claim 17 , wherein the plurality of different selectable subcarrier spacings comprise integer multiples of a first subcarrier sp

Assignees

• Genghiscomm Holdings Llc

Inventors

• Shattil Steve

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L41/12

  Discovery or management of network topologies · CPC title

• H04L41/0895

  Configuration of virtualised networks or elements, e.g. virtualised network function or OpenFlow elements · CPC title

• H04L41/40

  using virtualisation of network functions or resources, e.g. SDN or NFV entities · CPC title

• H04L27/2628 Primary

  Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators (H04L27/2634 takes precedence) · CPC title