Device and method for grant-free communication in wireless communication system

Patent metadata

Field	Value
Publication number	US-2020252155-A1
Application number	US-201816639950-A
Country	US
Kind code	A1
Filing date	Aug 17, 2018
Priority date	Aug 17, 2017
Publication date	Aug 6, 2020
Grant date	—

Abstract

The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). A method of operating a terminal in a wireless communication system includes receiving control information for grant-free communication from a base station, generating a reference signal by using one sequence among sequences included in sequence set information for the reference signal included in the control information, and transmitting the reference signal and a data signal to the base station by using grant-free resource region information included in the control information. The one sequence may be used to allow the base station to identify the terminal.

First claim

1 . A terminal apparatus in a wireless communication system, the apparatus comprising:
at least one transceiver; and at least one processor operatively coupled to the at least one transceiver, wherein the at least one processor is configured to:
receive control information for grant-free communication from a base station, generate a reference signal by using one sequence among sequences included in sequence set information for the reference signal included in the control information, and
transmit the reference signal and a data signal to the base station by using grant-free resource region information included in the control information, and
wherein the one sequence is used to allow the base station to identify the terminal.

2 . The apparatus of claim 1 , wherein the control information includes at least one of sequence set information of the reference signal, an IDentification (ID) of the terminal in a cell, transmission repetition count information, Modulation and Coding Scheme (MCS) information, subcarrier spacing information, subcarrier count information, and the grant-free resource region information.

3 . The apparatus of claim 1 , wherein the at least one processor is configured to transmit a random access preamble to the base station, receive a random access response from the base station, transmit a Radio Resource Control (RRC) request to the base station, and receive control information for the grant-free communication in response to the RRC request.

4 . The apparatus of claim 1 ,
wherein one sequence of the reference signal includes a first sequence and a second sequence, wherein a length of the first sequence is equal to the number of first sequences, and wherein a length of the second sequence is greater than the number of second sequences.

5 . The apparatus of claim 2 ,
wherein the at least one processor is configured to receive an initial access request from the base station and transmit an initial access response to the base station, and wherein transmission power of the initial access request is used to determine the transmission repetition count and the MCS level for the terminal by the base station.

6 . A base station apparatus in a wireless communication system, the apparatus comprising:
at least one transceiver; and at least one processor operatively coupled to the at least one transceiver, wherein the at least one processor is configured to transmit control information for grant-free communication to a terminal, receive a reference signal and a data signal through a resource for the grant-free communication from the terminal, and decode the reference signal and the data signal upon identifying the terminal on the basis of the reference signal, and wherein the reference signal is generated by using the sequence among sequences included in sequence set information for the reference signal included in the control information.

7 . The apparatus of claim 6 , wherein the control information includes at least one of sequence set information of the reference signal, an IDentification (ID) of the terminal in a cell, transmission repetition count information, Modulation and Coding Scheme (MCS) information, subcarrier spacing information, subcarrier count information, and the grant-free resource region information.

8 . The apparatus of claim 6 , wherein the at least one processor is configured to receive a random access preamble from the terminal, transmit a random access response to the terminal, receive a Radio Resource Control (RRC) request from the terminal; and transmit control information for the grant-free communication in response to the RRC request.

9 . The apparatus of claim 6 ,
wherein a sequence of the reference signal includes a first sequence and a second sequence, wherein a length of the first sequence is equal to the number of first sequences, and wherein a length of the second sequence is greater than the number of second sequences.

10 . The apparatus of claim 7 , wherein the at least one processor is configured to receive an initial access response upon transmitting the initial access request to the terminal, and determine the transmission repetition count and the MCS level for the terminal on the basis of transmission power of the initial access request.

11 . A method performed by terminal in a wireless communication system, the method comprising:
receiving control information for grant-free communication from a base station; generating a reference signal by using one sequence among sequences included in sequence set information for the reference signal included in the control information; and transmitting the reference signal and a data signal to the base station by using grant-free resource region information included in the control information, wherein the one sequence is used to allow the base station to identify the terminal.

12 . The method of claim 11 , wherein the control information includes at least one of sequence set information of the reference signal, an IDentification (ID) of the terminal in a cell, transmission repetition count information, Modulation and Coding Scheme (MCS) information, subcarrier spacing information, subcarrier count information, and the grant-free resource region information.

13 . The method of claim 11 , wherein the receiving control information for grant-free communication further comprise:
transmitting a random access preamble to the base station; receiving a random access response from the base station; transmitting a Radio Resource Control (RRC) request to the base station; and receiving control information for the grant-free communication in response to the RRC request.

14 . The method of claim 11 ,
wherein one sequence of the reference signal includes a first sequence and a second sequence, wherein a length of the first sequence is equal to the number of first sequences, and wherein a length of the second sequence is greater than the number of second sequences.

15 . The method of claim 12 , further comprising:
receiving an initial access request from the base station; and transmitting an initial access response to the base station, wherein transmission power of the initial access request is used to determine the transmission repetition count and the MCS level for the terminal by the base station.

16 . A method performed by base station in a wireless communication system, the method comprising:
transmitting control information for grant-free communication to a terminal, receive a reference signal and a data signal through a resource for the grant-free communication from the terminal; and decoding the reference signal and the data signal upon identifying the terminal on the basis of the reference signal, wherein the reference signal is generated by using the sequence among sequences included in sequence set information for the reference signal included in the control information.

17 . The method of claim 16 , wherein the control information includes at least one of sequence set information of the reference signal, an IDentification (ID) of the terminal in a cell, transmission repetition count information, Modulation and Coding Scheme (MCS) information, subcarrier spacing information, subcarrier count information, and the grant-free resource region information.

18 . The method of claim 16 , further comprising:
receiving a random access preamble from the terminal; transmitting a random access response to the terminal; receiving a Radio Resource Control (RRC) request from the terminal; and transmitting control infor

Assignees

• Samsung Electronics Co Ltd
• Industry-Academic Cooperation Foundation Yonsei Univ

Inventors

• Kim Chanhong
• Kim Yeonghwan
• Lee Chungyong
• Han Yonggue
• Hong Sungnam

Classifications

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W72/23

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

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04L1/0025

  Transmission of mode-switching indication · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title