# US 2017/0288794 A1 · Techniques for scaling bandwidth of an unlicensed radio frequency spectrum band

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- Number: US 2017/0288794 A1
- Document ID: US20170288794A1
- Status: Published application
- Kind: A1
- Application number: 15/629,483
- Filed: 2017-06-21
- Published: 2017-10-05
- Earliest claimed: 2014-07-16
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Srinivas Yerramalli; Tao Luo; Ravi Teja Sukhavasi; Makesh Pravin John Wilson; Kiran Kumar Somasundaram; Onkar Jayant Dabeer; Durga Prasad Malladi; Naga Bhushan; Yongbin Wei; Peter Gaal; Wanshi Chen; Hao Xu; Aleksandar Damnjanovic
- Web page: https://patentgrep.com/patent/US20170288794A1

## CPC

- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 72/00: Local resource management
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W 72/12: Wireless traffic scheduling
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present disclosure, for example, relates to one or more techniques for scaling the bandwidth of a carrier. Available sub-channels of an unlicensed radio frequency spectrum band may be determined, and the available sub-channels may be included in the carrier. The available sub-channels may be adjacent or non-adjacent sub-channels. The bandwidth of the carrier may be determined according to which sub-channels are included in the carrier. In this way, the bandwidth of the carrier may be scaled according to the available sub-channels in the unlicensed radio frequency spectrum band.

## Claims

### Claim 1

A method for wireless communication, comprising:
identifying a plurality of sub-channels in an unlicensed radio frequency spectrum band; and
communicating over a carrier using the unlicensed radio frequency spectrum band, the carrier comprising at least a first subset of the plurality of sub-channels, and the first subset comprising at least two sub-channels of the plurality of sub-channels.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
performing a first Clear Channel Assessment (CCA) on the plurality of sub-channels based at least in part on an optimistic CCA threshold; and
determining a plurality of potential sub-channels based at least in part on the first CCA, the plurality of potential sub-channels comprising at least a second subset of the plurality of sub-channels.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
performing a second CCA on the plurality of potential sub-channels based at least in part on a redistributed CCA threshold; and
determining a plurality of clear sub-channels based at least in part on the second CCA, wherein the carrier comprises the plurality of clear sub-channels.

### Claim 4 (depends on 3)

The method of claim 3, wherein the second CCA comprises CCA countdown slots for the plurality of potential sub-channels, and wherein a communication over the plurality of clear sub-channels is delayed until the CCA countdown slots are exceeded.

### Claim 5

An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory, the instructions being executable by the processor to:
identify a plurality of sub-channels in an unlicensed radio frequency spectrum band; and
communicate over a carrier using the unlicensed radio frequency spectrum band, the carrier comprising at least a first subset of the plurality of sub-channels, and the first subset comprising at least two sub-channels of the plurality of sub-channels.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the instructions are executable by the processor to:
perform a first Clear Channel Assessment (CCA) on the plurality of sub-channels based at least in part on an optimistic CCA threshold; and
determine a plurality of potential sub-channels based at least in part on the first CCA, the plurality of potential sub-channels comprising at least a second subset of the plurality of sub-channels.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the instructions are executable by the processor to:
perform a second CCA on the plurality of potential sub-channels based at least in part on a redistributed CCA threshold; and
determine a plurality of clear sub-channels based at least in part on the second CCA, wherein the carrier comprises the plurality of clear sub-channels.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the second CCA comprises CCA countdown slots for the plurality of potential sub-channels, and wherein a communication over the plurality of clear sub-channels is delayed until the CCA countdown slots are exceeded.

### Claim 9

An apparatus for wireless communication, comprising:
means for identifying a plurality of sub-channels in an unlicensed radio frequency spectrum band; and
means for communicating over a carrier using the unlicensed radio frequency spectrum band, the carrier comprising at least a first subset of the plurality of sub-channels, and the first subset comprising at least two sub-channels of the plurality of sub-channels.

### Claim 10 (depends on 9)

The apparatus of claim 9, further comprising:
means for performing a first Clear Channel Assessment (CCA) on the plurality of sub-channels based at least in part on an optimistic CCA threshold; and
means for determining a plurality of potential sub-channels based at least in part on the first CCA, the plurality of potential sub-channels comprising at least a second subset of the plurality of sub-channels.

### Claim 11 (depends on 10)

The apparatus of claim 10, further comprising:
means for performing a second CCA on the plurality of potential sub-channels based at least in part on a redistributed CCA threshold; and
means for determining a plurality of clear sub-channels based at least in part on the second CCA, wherein the carrier comprises the plurality of clear sub-channels.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein the second CCA comprises CCA countdown slots for the plurality of potential sub-channels, and wherein a communication over the plurality of clear sub-channels is delayed until the CCA countdown slots are exceeded.

### Claim 13

A non-transitory computer-readable medium storing computer-executable code for wireless communication, the code executable by a processor to:
identify a plurality of sub-channels in an unlicensed radio frequency spectrum band; and
communicate over a carrier using the unlicensed radio frequency spectrum band, the carrier comprising at least a first subset of the plurality of sub-channels, and the first subset comprising at least two sub-channels of the plurality of sub-channels.

### Claim 14 (depends on 13)

The non-transitory computer-readable medium of claim 13, wherein the code executable by the processor to:
perform a first Clear Channel Assessment (CCA) on the plurality of sub-channels based at least in part on an optimistic CCA threshold; and
determine a plurality of potential sub-channels based at least in part on the first CCA, the plurality of potential sub-channels comprising at least a second subset of the plurality of sub-channels.

### Claim 15 (depends on 14)

The non-transitory computer-readable medium of claim 14, wherein the code executable by the processor to:
perform a second CCA on the plurality of potential sub-channels based at least in part on a redistributed CCA threshold; and
determine a plurality of clear sub-channels based at least in part on the second CCA, wherein the carrier comprises the plurality of clear sub-channels.

### Claim 16 (depends on 15)

The non-transitory computer-readable medium of claim 15, wherein the second CCA comprises CCA countdown slots for the plurality of potential sub-channels, and wherein a communication over the plurality of clear sub-channels is delayed until the CCA countdown slots are exceeded.