Method and apparatus for transmitting signal in unlicensed band communication system, method and apparatus for scheduling uplink, and method and apparatus for transmitting information about channel state measurement section

Patent metadata

Field	Value
Publication number	US-2018317244-A1
Application number	US-201715771362-A
Country	US
Kind code	A1
Filing date	Jan 26, 2017
Priority date	Jan 29, 2016
Publication date	Nov 1, 2018
Grant date	—

Abstract

A method for transmitting an uplink signal in an unlicensed band by a terminal is provided. The terminal receives first scheduling information that schedules one or more uplink subframes, from a base station in a first downlink subframe. The terminal receives second scheduling information that determines a transmission time point of the uplink signal, from the base station in a second downlink subframe after the first downlink subframe. The terminal transmits the uplink signal in a first uplink subframe corresponding to the transmission time point among the one or more uplink subframes.

First claim

1 . A method for transmitting an uplink signal in an unlicensed band by a terminal, the method comprising:
receiving first scheduling information that schedules one or more uplink subframes, from a base station in a first downlink subframe; receiving second scheduling information that determines a transmission time point of the uplink signal, from the base station in a second downlink subframe after the first downlink subframe; and transmitting the uplink signal in a first uplink subframe corresponding to the transmission time point among the one or more uplink subframes.

2 . The method of claim 1 , further comprising:
invalidating the first scheduling information, when the second scheduling information is not received within a predetermined time from the first downlink subframe.

3 . The method of claim 2 , wherein:
the predetermined time is indicated by a timing offset field included in first downlink control information (DCI).

4 . The method of claim 2 , wherein:
the predetermined time is included in the first scheduling information or is signaled to the terminal through a radio resource control (RRC) message.

5 . The method of claim 1 , wherein:
the receiving of the second scheduling information includes receiving the second scheduling information through common downlink control information (DCI) of an unlicensed band cell.

6 . The method of claim 1 , wherein:
the transmitting of the uplink signal includes transmitting the uplink signal in the first uplink subframe, when the terminal belongs to a first terminal group represented by terminal group information included in the second scheduling information.

7 . The method of claim 1 , wherein:
the transmitting of the uplink signal includes confirming an occupancy state of an unlicensed band channel for a time of 25 μS, before transmitting the uplink signal; and transmitting the uplink signal, when the occupancy state of the unlicensed band channel is a non-occupancy state.

8 . A method for scheduling an uplink by a base station, the method comprising:
including first information representing a first uplink subframe which is scheduled in first downlink control information (DCI); including second information representing a second uplink subframe which is scheduled in second DCI different from the first DCI; and transmitting the first DCI and the second DCI in a first downlink subframe.

9 . The method of claim 8 , wherein:
when a value of the first information is X (here, X is a positive integer including 0), an interval between a start of the first downlink subframe and a start of the first uplink subframe corresponds to (4+X) subframes.

10 . The method of claim 8 , wherein:
the including of the first information in the first DCI includes including third information representing the number of uplink subframes which are continuously scheduled in the first DCI.

11 . The method of claim 10 , wherein:
when a value of the third information is a first value, a location of the first uplink subframe is determined based on the first information, and when the value of the third information is different from the first value, the location of the first uplink subframe is determined regardless of the first information.

12 . The method of claim 10 , wherein:
when a value of the first information is a first value, the number of uplink subframes which are continuously scheduled is determined based on the third information, and when the value of the first information is different from the first value, the number of uplink subframes which are continuously scheduled is determined as 1 regardless of the third information.

13 . The method of claim 8 , further comprising:
transmitting information for triggering a sounding reference signal (SRS) transmission within a subframe after a predetermined time from the first downlink subframe, in the first downlink subframe.

14 . The method of claim 8 , further comprising:
transmitting information representing whether or not the last time domain symbol of a plurality of time domain symbols included in a subframe after a predetermined time from the first downlink subframe is for a sounding reference signal (SRS) transmission, in the first downlink subframe.

15 . A method for transmitting, by a base station, information related to a first section in which an occupancy state of an unlicensed band channel is measured, the method comprising:
generating first information representing a location of a time domain symbol at which an uplink transmission starts among a plurality of time domain symbols included in a first subframe, in order to inform a terminal whether or not the first section is set in a first time slot included in the first subframe; and generating second information representing a location of a time domain symbol at which an uplink transmission ends among the plurality of time domain symbols, in order to inform the terminal whether or not the first section is set in a second time slot included in the first subframe and present after the first time slot.

16 . The method of claim 15 , wherein:
when the first section is not set in the first time slot, the first information represents a first time domain symbol present at the front of the plurality of time domain symbols, and when the first section is set in the first time slot, the first information represents a time domain symbol different from the first time domain symbol among the plurality of time domain symbols.

17 . The method of claim 15 , wherein:
when the first section is not set in the second time slot, the second information represents a first time domain symbol present at the last of the plurality of time domain symbols, and when the first section is set in the second time slot, the second information represents a time domain symbol different from the first time domain symbol among the plurality of time domain symbols.

18 . The method of claim 15 , further comprising:
transmitting the first information and the second information to the terminal through at least one of UE-specific downlink control information (DCI) and common DCI.

19 . The method of claim 15 , further comprising:
transmitting a first bit pair representing the first section for the first subframe and a second bit pair representing the first section for a second subframe to the terminal at a first time point, and wherein the first bit pair includes one bit for the first information and one bit for the second information.

20 . The method of claim 19 , further comprising:
changing a value of the first bit pair when the first section for the first subframe is changed; and transmitting the changed first bit pair and the second bit pair to the terminal at a second time point after the first time point.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Um Jung Sun
• Jung Hoiyoon
• Yoo Sungjin
• Park Seung Keun

Classifications

• H04W72/23

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

• H04W16/32

  Hierarchical cell structures · CPC title

• H04L27/0006

  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) · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title