# US 10,873,972 B2 · Method and equipment for channel sensing and signal transmission

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- Number: US 10,873,972 B2
- Document ID: US10873972B2
- Status: Granted
- Kind: B2
- Application number: 15/204,283
- Filed: 2016-07-07
- Published: 2017-01-19
- Granted: 2020-12-22
- Earliest claimed: 2015-07-16
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Yi Wang; Shichang Zhang; Yingyang Li
- Web page: https://patentgrep.com/patent/US10873972B2

## CPC

- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 5/001: {the frequencies being arranged in component carriers}
- 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

A method for channel sensing and signal transmission is provided. The method includes that a signal transmission mode of a communication node in a predefined time window is different from a signal transmission mode of the communication node outside the predefined time window, which includes at least one of a channel sensing mode and a data transmission mode. By performing the method, a frequency domain multiplexing coefficient among nodes adopting the same access technology can be improved, and the coexistence of the access technology and others can be ensured.

## Claims

### Claim 1

A method for channel sensing and signal transmission on a cell in an unlicensed frequency band channel, the method comprising:
identifying, by a sending node, whether the unlicensed frequency band channel is idle for a first channel sensing interval; and
in case that the unlicensed frequency band channel is idle for the first channel sensing interval, transmitting, by a sending node, a discovery signal not including physical downlink shared channel (PDSCH) on a first period in a subframe within a predetermined timing window when a duration of the first period for the transmitting of the discovery signal is less than 1 ms,
wherein a duration of the subframe corresponds to a duration of 14 orthogonal frequency division multiplexing (OFDM) symbols,
wherein the duration of the first period corresponds to 12 OFDM symbols of the 14 OFDM symbols within the subframe, and
wherein a duration of the first channel sensing interval associated with the transmitting of the discovery signal without the PDSCH is equal to or shorter than a duration of a second channel sensing interval associated with a transmitting of the PDSCH.

### Claim 2 (depends on 1)

The method of claim 1, wherein the predetermined timing window is a timing window for radio resource management (RRM) measurement.

### Claim 3 (depends on 1)

The method of claim 1,
wherein the predetermined timing window is a discovery signals (DRS) measurement timing configuration (DMTC) window.

### Claim 4 (depends on 1)

The method of claim 1, wherein a starting symbol and a last symbol of the 12 OFDM symbols are a first cell specific reference signal (CRS) symbol and a second CRS symbol, respectively.

### Claim 5 (depends on 1)

The method of claim 1, wherein the duration of the first channel sensing interval includes 25 μs.

### Claim 6

An equipment for channel sensing and signal transmission on a cell in an unlicensed frequency band channel, the equipment comprising:
a channel sensing unit; and
a signal sending unit,
wherein the channel sensing unit is configured to:
identify whether the unlicensed frequency band channel is idle for a first channel sensing interval,
wherein the signal sending unit is configured to:
in case that the unlicensed frequency band channel is idle for the first channel sensing interval, transmit a discovery signal not including physical downlink shared channel (PDSCH) on a first period in a subframe within a predetermined timing window when a duration of the first period for the transmitting of the discovery signal is less than 1 ms,
wherein a duration of the subframe corresponds to a duration of 14 orthogonal frequency division multiplexing (OFDM) symbols,
wherein the duration of the first period corresponds to 12 OFDM symbols of the 14 OFDM symbols within the subframe, and
wherein a duration of the first channel sensing interval associated with the transmitting of the discovery signal without the PDSCH is equal to or shorter than a duration of a second channel sensing interval associated with a transmitting of the PDSCH.

### Claim 7 (depends on 6)

The equipment of claim 6, wherein the predetermined timing window is a timing window for radio resource management (RRM) measurement.

### Claim 8 (depends on 6)

The equipment of claim 6, wherein the predetermined timing window is a discovery signals (DRS) measurement timing configuration (DMTC) window.

### Claim 9 (depends on 6)

The equipment of claim 6, wherein a starting symbol and a last symbol of the 12 OFDM symbols are a first cell specific reference signal (CRS) symbol and a second CRS symbol, respectively.

### Claim 10 (depends on 6)

The equipment of claim 6, wherein the first channel sensing interval includes 25 μs.