Method for communicating in network supporting licensed and unlicensed bands

Patent metadata

Field	Value
Publication number	US-2018317256-A1
Application number	US-201715771490-A
Country	US
Kind code	A1
Filing date	Feb 1, 2017
Priority date	Feb 4, 2016
Publication date	Nov 1, 2018
Grant date	—

Abstract

Disclosed is a method for communicating in a network supporting licensed and unlicensed bands. A terminal operation method comprises the steps of: detecting a control channel of a subframe #n transmitted from a base station; obtaining, from the control channel, a DCI for an uplink grant; executing channel sensing on the basis of channel connection-related information included in the DCI; and transmitting, to the base station, a subframe #(n+1) if the result of executing channel sensing is an idle state. Thus, the performance of the communication network may be improved.

First claim

1 . An operation method of a terminal in a communication network, the operation method comprising:
detecting a control channel of a subframe #n transmitted from a base station; obtaining a downlink control information (DCI) for an uplink grant from the control channel; performing channel sensing based on channel access related information included in the DCI; and transmitting a subframe #(n+1) to the base station when a result of the channel sensing is an idle state, wherein each of the subframe #n and the subframe #(n+1) is an unlicensed band subframe, n is an integer equal to or greater than 0, and 1 is an integer equal to or greater than 4.

2 . The operation method according to claim 1 , wherein the channel access related information includes a channel access type, wherein a channel access type 1 indicates that the channel sensing is performed during a period corresponding to a backoff counter selected within a contention window, and a channel access type 2 indicates that the channel sensing is performed during a preconfigured period.

3 . The operation method according to claim 2 , wherein the preconfigured period is 25 μs or 25 μs+timing advance (TA).

4 . The operation method according to claim 2 , wherein a size of the contention window is configured based on a channel access priority.

5 . The operation method according to claim 2 , wherein the DCI further includes a new data indicator (NDI), and a size of the contention window is configured based on the NDI.

6 . The operation method according to claim 1 , wherein the DCI further includes a starting position of a physical uplink shared channel (PUSCH) included in a subframe scheduled by the DCI.

7 . The operation method according to claim 6 , wherein the starting position is a first symbol of a first slot of the subframe scheduled by the DCI, a time point after 25 μs from a starting position of the first symbol, a time point after 25 μs+timing advance (TA) from the starting position of the first symbol, or a second symbol of the first slot.

8 . The operation method according to claim 1 , wherein the DCI further includes an ending position of a physical uplink shared channel (PUSCH) included in a subframe scheduled by the DCI.

9 . The operation method according to claim 8 , wherein the ending position is a last symbol of a second slot of a subframe scheduled by the DCI or a symbol which is prior to the last symbol in the second slot.

10 . An operation method of a base station in a communication network, the operation method comprising:
generating a downlink control information (DCI) including a channel access related information; transmitting the DCI to a terminal via a subframe #n; and receiving a subframe #(n+1) scheduled by the DCI from the terminal, wherein the subframe #(n+1) is received from the terminal when a result of a channel sensing based on the channel access related information is determined to be an idle state, n is an integer equal to or greater than 0, and 1 is an integer equal to or greater than 4.

11 . The operation method according to claim 10 , wherein the channel access related information includes a channel access type, wherein a channel access type 1 indicates that the channel sensing is performed during a period corresponding to a backoff counter selected within a contention window, and a channel access type 2 indicates that the channel sensing is performed during a preconfigured period.

12 . The operation method according to claim 11 , wherein the preconfigured period is 25 μs or 25 μs+timing advance (TA).

13 . The operation method according to claim 10 , wherein the DCI further includes a starting position of a physical uplink shared channel (PUSCH) included in a subframe scheduled by the DCI.

14 . The operation method according to claim 13 , wherein the starting position is a first symbol of a first slot of the subframe scheduled by the DCI, a time point after 25 μs from a starting position of the first symbol, a time point after 25 μs+timing advance (TA) from the starting position of the first symbol, or a second symbol of the first slot.

15 . The operation method according to claim 10 , wherein the DCI further includes an ending position of a physical uplink shared channel (PUSCH) included in a subframe scheduled by the DCI.

16 . The operation method according to claim 15 , wherein the ending position is a last symbol of a second slot of a subframe scheduled by the DCI or a symbol which is prior to the last symbol in the second slot.

17 . A terminal in a communication network, the terminal comprising a processor and a memory storing at least one instruction executed by the processor, wherein the at least one instruction is configured to:
detect a control channel of a subframe #n transmitted from a base station; obtain a downlink control information (DCI) for an uplink grant from the control channel; perform channel sensing based on channel access related information included in the DCI; and transmit a subframe #(n+1) to the base station when a result of the channel sensing is determined to be an idle state, wherein each of the subframe #n and the subframe #(n+1) is an unlicensed band subframe, n is an integer equal to or greater than 0, and 1 is an integer equal to or greater than 4.

18 . The terminal according to claim 17 , wherein the channel access related information includes a channel access type, wherein a channel access type 1 indicates that the channel sensing is performed during a period corresponding to a backoff counter selected within a contention window, and a channel access type 2 indicates that the channel sensing is performed during a preconfigured period.

19 . The terminal according to claim 17 , wherein the DCI further includes a starting position of a physical uplink shared channel (PUSCH) included in a subframe scheduled by the DCI.

20 . The terminal according to claim 17 , wherein the DCI further includes an ending position of a physical uplink shared channel (PUSCH) included in a subframe scheduled by the DCI.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Um Jung Sun
• Jung Hoi Yoon
• Park Seung Keun
• Yoo Sung Jin

Classifications

• H04W72/56

  based on priority criteria · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W74/0808 Primary

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

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W16/14

  Spectrum sharing arrangements {between different networks} · CPC title