# US 10,485,025 B2 · Systems and methods for performing channel sensing for license assisted access

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,485,025 B2
- Document ID: US10485025B2
- Status: Granted
- Kind: B2
- Application number: 15/085,949
- Filed: 2016-03-30
- Published: 2016-10-06
- Granted: 2019-11-19
- Earliest claimed: 2015-04-02
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Laboratories of America, Inc.
- Inventors: Zhanping Yin; Toshizo Nogami
- Web page: https://patentgrep.com/patent/US10485025B2

## CPC

- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/003: {Arrangements for allocating sub-channels of the transmission path}
- H04L 5/0078: {Timing of allocation}
- H04W 16/10: Dynamic resource partitioning
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 72/04: Wireless resource allocation
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An evolved NodeB (eNB) is described that includes a processor and memory in electronic communication with the processor. Instructions stored in the memory are executable to perform a channel sensing on a Licensed-Assisted Access (LAA) secondary cell (SCell) for a transmission. The instructions are also executable to manage a counter based on whether or not the channel is sensed to be idle. The instructions are further executable to determine whether or not the eNB performs the transmission if the counter reaches zero. The instructions are additionally executable to perform the transmission if determined, otherwise suspend the transmission and perform an additional channel sensing for the transmission.

## Claims

### Claim 1

A base station comprising:
a processor; and
a memory in electronic communication with the processor, wherein instructions stored in the memory are executable by the processor to:
perform a channel sensing on a Licensed-Assisted Access (LAA) secondary cell (SCell) for a transmission;
manage a counter based on whether or not the channel is sensed to be idle;
determine one of (i) the base station performs the transmission and (ii) the base station does not perform the transmission after the counter reaches zero; and
perform the transmission in a case that the base station determines to perform the transmission, otherwise defer the transmission and perform an additional channel sensing for the transmission.

### Claim 2 (depends on 1)

The base station of claim 1, wherein the instructions are executable by the processor to determine that the base station does not perform the transmission if another cell does not sense the channel as idle when the counter reaches zero.

### Claim 3

A method for a base station, the method comprising:
performing a channel sensing on a Licensed-Assisted Access (LAA) secondary cell (SCell) for a transmission;
managing a counter based on whether or not the channel is sensed to be idle;
determining one of (i) the base station performs the transmission and (ii) the base station does not perform the transmission after the counter reaches zero; and
performing the transmission in a case that the base station determines to perform the transmission, otherwise deferring the transmission and performing an additional channel sensing for the transmission.

### Claim 4 (depends on 3)

The method of claim 3, wherein the base station determines that the base station does not perform the transmission if another cell does not sense the channel as idle when the counter reaches zero.

### Claim 5 (depends on 1)

The base station of claim 1, wherein the transmission includes physical downlink shared channel (PDSCH).

### Claim 6 (depends on 3)

The method of claim 3, wherein the transmission includes physical downlink shared channel (PDSCH).

### Claim 7 (depends on 1)

The base station of claim 1, wherein
the instructions are executable by the processor to, in a case where the channel is sensed to be idle, manage the counter such that
in a situation in which the counter does not reach zero, the base station decrements the counter by 1 and performs the channel sensing.

### Claim 8 (depends on 3)

The method for a base station of claim 3, wherein
in a case where the channel is sensed to be idle, the base station manages the counter such that
in a situation in which the counter does not reach zero, the base station decrements the counter by 1 and performs the channel sensing.