Techniques for transmitting and receiving channel occupancy identifiers over an unlicensed radio frequency spectrum band

• US 10,356,807 B2
• Filed: 07/06/2015
• Issued: 07/16/2019
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yerramalli, Srinivas, Damnjanovic, Aleksandar, Somasundaram, Kiran Kumar, Luo, Tao, Dabeer, Onkar Jayant, Malladi, Durga Prasad, Bhushan, Naga, Wei, Yongbin, Gaal, Peter, Chen, Wanshi, Stamoulis, Anastasios, Xu, Hao, Zhang, Xiaoxia
• Primary Examiner(s): Randhawa, Mandish K
• Application Number:
  US14/791,835
• Publication Number:
  US 20160057770A1
• Time in Patent Office: 1,471 Days
• CPC Class Codes: H04B 7/0811 during preamble or gap period
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 67/146 Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers

Abstract

Techniques are described for wireless communication. A first method may include inserting, in a first transmission using a first radio access technology (RAT), a channel occupancy identifier for a second transmission using a second RAT. The first method may also include transmitting the first transmission having the channel occupancy identifier over an unlicensed radio frequency spectrum band. A second method may include receiving, at a receiver operated using a first RAT, a channel occupancy identifier for a transmission using a second RAT. The channel occupancy identifier may be received over an unlicensed radio frequency spectrum band. The second method may also include decoding the channel occupancy identifier to identify a backoff period, and refraining from accessing the unlicensed radio frequency spectrum band using the first RAT based at least in part on the identified backoff period.

Claims

1. A method for wireless communication, comprising:

performing a Listen Before Talk (LBT) to contend for access to an unlicensed radio frequency spectrum band;

determining whether a resynchronization boundary has passed;

inserting, in a first transmission using a first radio access technology (RAT), a channel occupancy identifier for a second transmission using a second RAT, wherein the channel occupancy identifier comprises at least a portion of a Wi-Fi preamble; and

transmitting, based at least in part on winning contention to access the unlicensed radio frequency spectrum band and a determination that the resynchronization boundary has not passed, the first transmission having the channel occupancy identifier over the unlicensed radio frequency spectrum band.

2. The method of claim 1, wherein the portion of the Wi-Fi preamble comprises at least a first symbol and a second symbol, the method further comprising:

formatting the Wi-Fi preamble by rotating a second constellation of the second symbol with respect to a first constellation of the first symbol.

3. The method of claim 1, wherein the channel occupancy identifier identifies a duration for which the unlicensed radio frequency spectrum band is reserved.

4. The method of claim 3, wherein the duration comprises a number of orthogonal frequency division multiplexed (OFDM) symbol periods.

5. The method of claim 1, further comprising:

transmitting the channel occupancy identifier as at least a portion of a channel usage beacon symbol (CUBS).

6. The method of claim 1, further comprising:

time-dithering a transmission time of the channel occupancy identifier over the unlicensed radio frequency spectrum band.

7. The method of claim 6, further comprising:

selecting the transmission time based at least in part on a cell identifier.

8. The method of claim 6, further comprising:

selecting the transmission time based at least in part on a public mobile land network (PLMN) identifier.

9. The method of claim 1, wherein inserting the channel occupancy identifier in the first transmission comprises:

inserting the channel occupancy identifier in a data subframe of the first transmission.

10. The method of claim 1, wherein inserting the channel occupancy identifier in the first transmission comprises:

inserting at least a first instance of the channel occupancy identifier and a second instance of the channel occupancy identifier in the first transmission.

11. The method of claim 1, wherein the transmitting is performed by a first transmitting apparatus, wherein a first portion of the channel occupancy identifier is common to a first portion of an overlapping transmission of a second channel occupancy identifier transmitted by a second transmitting apparatus, and wherein a second portion of the channel occupancy identifier differs from a second portion of the second channel occupancy identifier transmitted by the second transmitting apparatus.

12. An apparatus for wireless communication, comprising:

means for performing a Listen Before Talk (LBT) to contend for access to an unlicensed radio frequency spectrum band;

means for determining whether a resynchronization boundary has passed;

means for inserting, in a first transmission using a first radio access technology (RAT), a channel occupancy identifier for a second transmission using a second RAT, wherein the channel occupancy identifier comprises at least a portion of a Wi-Fi preamble; and

means for transmitting, based at least in part on winning contention to access the unlicensed radio frequency spectrum band and a determination that the resynchronization boundary has not passed, the first transmission having the channel occupancy identifier over the unlicensed radio frequency spectrum band.

13. The apparatus of claim 12, wherein the channel occupancy identifier identifies a duration for which the unlicensed radio frequency spectrum band is reserved.