Method and system for multi-protocol transmissions

Patent metadata

Field	Value
Publication number	US-10742464-B2
Application number	US-201616318572-A
Country	US
Kind code	B2
Filing date	Jul 22, 2016
Priority date	Jul 22, 2016
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

Methods and systems for multi-protocol transmissions in shared spectrum are disclosed where an OFDM transmitter is configured to generate transmissions associated with one OFDM technology or protocol using subcarriers of another OFDM technology. Generally, multi-protocol transmissions as described herein may be performed sequentially (e.g. in a time division multiplexing fashion) or concurrently (e.g. during the same or an overlapping time interval). For concurrent transmissions, an OFDM transmitter may be configured to map or assign the different OFDM signals to different subsets of the available OFDM subcarriers such that the data contained therein can be transmitted at the same or during an overlapping time interval. In one application, an LTE transmitter is configured to use different subsets of the LTE subcarriers for concurrent LTE and 802.11 transmissions that can respectively be decoded by LTE and 802.11 receivers.

First claim

The invention claimed is:

1. A method for an OFDM transmitter configured for OFDM signal transmissions using a first plurality of subcarriers having a first subcarrier frequency spacing defining a first symbol duration, the method comprising:
generating a first OFDM signal containing data associated with a first OFDM communication protocol,
generating a second OFDM signal containing data associated with a second OFDM communication protocol, and
transmitting, during one or more first symbol durations, the first OFDM signal using a first subset of subcarriers from the first plurality of subcarriers, and the second OFDM signal using a second subset of subcarriers from the first plurality of subcarriers, different from the first subset,
wherein the first and second OFDM signals are generated in one of a time domain and a frequency domain, based on respective first and second predetermined OFDM signals containing data associated with the first and second OFDM communication protocols,
wherein generating the first OFDM signal comprises mapping the first predetermined OFDM signal to subcarriers in at least the first subset and wherein generating the second OFDM signal comprises mapping the second predetermined OFDM signal to subcarriers in at least the second subset,
wherein the first predetermined OFDM signal is defined to use only the first subset of subcarriers, and wherein generating the first OFDM signal comprises mapping the first predetermined OFDM signal to subcarriers in the first subset.

2. The method of claim 1 wherein the first predetermined OFDM signal comprises a first set of modulation values for at least the first subset of subcarriers, the first set of modulation values corresponding to data associated with the first OFDM communication protocol, and wherein the second predetermined OFDM signal comprises a second set of modulation values for at least the second subset of subcarriers, the second set of modulation values corresponding to data associated with the second OFDM communication protocol.

3. The method of claim 1 wherein subcarriers in one of the first and second subsets of subcarriers are configured to be contiguous or interleaved with subcarriers in the other of the first and second subsets of subcarriers.

4. The method of claim 1 wherein the second OFDM signal contains control data associated with the second OFDM communication protocol, the control data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of the first and second OFDM signals.

5. The method of claim 1 wherein the second OFDM signal contains packet data associated with the second OFDM communication protocol, the packet data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of first and the second OFDM signals.

6. An OFDM transmitter configured for OFDM signal transmissions using a first plurality of subcarriers having a first subcarrier frequency spacing defining a first symbol duration, the OFDM transmitter comprising circuitry containing instructions which, when executed, cause the transmitter to:
generate a first OFDM signal containing data associated with a first OFDM communication protocol,
generate a second OFDM signal containing data associated with a second OFDM communication protocol, and
transmit, during one or more first symbol durations, the first OFDM signal using a first subset of subcarriers from the first plurality of subcarriers, and the second OFDM signal using a second subset of subcarriers from the first plurality of subcarriers, different from the first subset,
wherein the first and second OFDM signals are generated in one of a time domain and a frequency domain, based on respective first and second predetermined OFDM signals containing data associated with the first and second OFDM communication protocols,
wherein to generate the first OFDM signal, the instructions are configured to cause the transmitter to map the first predetermined OFDM signal to subcarriers in at least the first subset and to generate the second OFDM signal, the instructions are configured to cause the transmitter to map the second predetermined OFDM signal to subcarriers in at least the second subset,
wherein the first predetermined OFDM signal is defined to use only the first subset of subcarriers, and wherein to generate the first OFDM signal, the instructions are further configured to cause the transmitter to map the first predetermined OFDM signal to subcarriers in the first subset.

7. The OFDM transmitter of claim 6 wherein the first predetermined OFDM signal comprises a first set of modulation values for at least the first subset of subcarriers, the first set of modulation values corresponding to data associated with the first OFDM communication protocol, and wherein the second predetermined OFDM signal comprises a second set of modulation values for at least the second subset of subcarriers, the second set of modulation values corresponding to data associated with the second OFDM communication protocol.

8. The OFDM transmitter of claim 6 wherein subcarriers in one of the first and second subsets of subcarriers are configured to be contiguous or interleaved with subcarriers in the other of the first and second subsets of subcarriers.

9. The OFDM transmitter of claim 6 wherein the second OFDM signal contains control data associated with the second OFDM communication protocol, the control data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of the first and second OFDM signals.

10. The OFDM transmitter of claim 6 wherein the second OFDM signal contains packet data associated with the second OFDM communication protocol, the packet data being indicative of one of a transmission length, transmission time, transmission type and a channel reservation time associated with at least one of first and the second OFDM signals.

Assignees

• Boudreau Gary
• Halabian Hassan
• Smith Roland
• Ericsson Telefon Ab L M

Inventors

• Boudreau Gary
• Halabian Hassan
• Smith Roland

Classifications

• H04L5/003 Primary

  Arrangements for allocating sub-channels of the transmission path · 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

• H04W16/14

  Spectrum sharing arrangements {between different networks} · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L27/2602 Primary

  Signal structure · CPC title