Method for channel sensing in wireless communication system and apparatus therefor

Patent metadata

Field	Value
Publication number	US-2018115992-A1
Application number	US-201615573060-A
Country	US
Kind code	A1
Filing date	May 12, 2016
Priority date	May 13, 2015
Publication date	Apr 26, 2018
Grant date	—

Abstract

One embodiment of the present invention relates to a method for channel sensing within an unlicensed band in a wireless communication system. The method is performed by a transmission node which performs the channel sensing, and may comprises the steps of: receiving, from a control node, a control signal including data transfer indication; receiving, from the control node, an indicator indicating an interval at which a channel-sensing related operation associated with the data transfer indication is performed; and performing the channel-sensing related operation for a length of time corresponding to the indicator before a data transfer start time according to the data transfer indication, or, on the basis of the time at which the control signal is received, from after a length of time corresponding to the indicator, until before the data transfer start time according to the data transfer indication.

First claim

What is claimed is:

1 . A method of performing channel sensing, which is performed by a transmitting node in an unlicensed band in a wireless communication system, comprising:
receiving a control signal containing a data transmission indication from a control node; receiving an indicator indicating a section in which a channel sensing-related operation associated with the data transmission indication is performed from the control node; and performing the channel sensing-related operation during a length of time corresponding to the indicator before data transmission start timing according to the data transmission indication or during time after the length of time corresponding to the indicator from timing at which the control signal is received before the data transmission start timing according to the data transmission indication.

2 . The method of claim 1 , wherein the channel sensing-related operation comprises at least one of an operation of performing a back-off counter-based initial CCA (clear channel assessment), an operation of performing a back-off counter-based ECCA (extended CCA), or an operation of transmitting a reservation signal.

3 . The method of claim 1 , wherein the indicator indicating the section in which the channel sensing-related operation is performed is contained in the control signal.

4 . The method of claim 1 , wherein the indicator indicating the section in which the channel sensing-related operation is performed is received by higher layer signaling.

5 . The method of claim 1 , further comprising receiving an indication indicating whether or not a reservation signal is transmitted from the control node.

6 . The method of claim 1 , further comprising receiving a second indicator indicating a section in which transmission of a reservation signal is permitted from the control node,
wherein the section in which the transmission of the reservation signal is permitted includes a length of time corresponding to the second indicator before data transmission start timing according to the data transmission indication or a length of time after the length of time corresponding to the second indicator from timing at which the control signal is received before the data transmission start timing according to the data transmission indication.

7 . The method of claim 6 , wherein the length of time corresponding to the second indicator corresponds to a fixed length of time.

8 . The method of claim 1 , wherein if the data transmission indication indicates data transmission during a plurality of scheduling units, each of a plurality of the scheduling units comprises a time frequency resource not performing the data transmission.

9 . The method of claim 8 , wherein the time frequency resource not performing the data transmission is used for a channel sensing-related operation of other nodes.

10 . The method of claim 1 , wherein if the data transmission indication indicates data transmission during a plurality of scheduling units, each of a plurality of the scheduling units comprises a time resource in which the transmitting node configured by the control node transmits a known signal.

11 . The method of claim 10 , wherein the time resource in which the transmitting node transmits the known signal is used for a channel sensing-related operation of other nodes.

12 . The method of claim 1 , wherein the control signal further comprises information indicating whether or not the channel sensing-related operation is initialized.

13 . The method of claim 12 , wherein the information indicating whether or not the channel sensing-related operation is initialized is used for simultaneous transmission with other UEs.

14 . The method of claim 1 , if it fails to perform the data transmission indicated by the data transmission indication according to a result of the channel sensing, further comprising initializing the channel sensing-related operation.

15 . A node configured to perform channel sensing in an unlicensed band in a wireless communication system, comprising:
an radio frequency (RF) unit; and a processor that controls the RF unit, the processor controls the RF unit to receive a control signal containing a data transmission indication from a control node, controls the RF unit to receive an indicator indicating a section in which a channel sensing-related operation associated with the data transmission indication is performed from the control node, performs the channel sensing-related operation during a length of time corresponding to the indicator before data transmission start timing according to the data transmission indication or during time after the length of time corresponding to the indicator from timing at which the control signal is received before the data transmission start timing according to the data transmission indication.

Assignees

• Lg Electronics Inc

Inventors

• Park Hanjun
• Ahn Joonkui
• Kim Seonwook

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W74/0816

  with collision avoidance · CPC title

• H04W74/0808 Primary

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title

• H04W16/14

  Spectrum sharing arrangements {between different networks} · CPC title

• H04W72/1278

  Electricity · mapped topic