Method and apparatus for uplink channel accessing wireless communication system

Abstract

A communication technique for fusing 5G communication, which supports a higher data transmission rate than a 4G system, with an IoT technology is provided, and may be applied to an intelligent service based on the 5G communication technology and the IoT related technology. Accordingly, a method for transmitting information by a base station in a wireless communication system, includes generating information on a channel sensing operation of a user equipment (UE) in an unlicensed band, wherein the information on the channel sensing operation indicates one of a first type performing the channel sensing operation using a variable time period, a second type performing the channel sensing operation using a fixed time period, and a third type not performing the channel sensing operation; and transmitting, to the UE, the information on the channel sensing operation.

What is claimed is: 
     
         1 . A base station for transmitting information in a wireless communication system, the base station comprising:
 a transceiver; and   a controller coupled with the transceiver and configured to control to:
 generate information on a channel sensing operation of a user equipment (UE) in an unlicensed band, wherein the information on the channel sensing operation indicates one of a first type performing the channel sensing operation using a variable time period, a second type performing the channel sensing operation using a fixed time period, and a third type not performing the channel sensing operation, and 
 transmit, to the UE, the information on the channel sensing operation. 
   
     
     
         2 . The base station of  claim 1 , wherein the information on the channel sensing operation indicates the third type in case that a gap from an end of a downlink (DL) transmission to a beginning of a uplink (UL) transmission is not greater than a predetermined time. 
     
     
         3 . The base station of  claim 1 , wherein an uplink signal is transmitted after sensing a channel for the unlicensed band during the variable time period in case that the information on the channel sensing operation indicates the first type, and
 wherein the uplink signal is transmitted after sensing the channel for the unlicensed band during the fixed time period in case that the information on the channel sensing operation indicates the second type.   
     
     
         4 . The base station of  claim 1 , wherein the variable time period for the first type is randomly selected based on a contention window for the UE. 
     
     
         5 . The base station of  claim 4 , wherein a value of the contention window is determined based on a new data indicator (NDI) value for a hybrid automatic repeat request (HARQ) process. 
     
     
         6 . A method for transmitting information by a base station in a wireless communication system, the method comprising:
 generating information on a channel sensing operation of a user equipment (UE) in an unlicensed band, wherein the information on the channel sensing operation indicates one of a first type performing the channel sensing operation using a variable time period, a second type performing the channel sensing operation using a fixed time period, and a third type not performing the channel sensing operation; and   transmitting, to the UE, the information on the channel sensing operation.   
     
     
         7 . The method of  claim 6 , wherein the information on the channel sensing operation indicates the third type in case that a gap from an end of a downlink (DL) transmission to a beginning of a uplink (UL) transmission is not greater than a predetermined time. 
     
     
         8 . The method of  claim 6 , wherein an uplink signal is transmitted after sensing a channel for the unlicensed band during the variable time period in case that the information on the channel sensing operation indicates the first type, and
 wherein the uplink signal is transmitted after sensing the channel for the unlicensed band during the fixed time period in case that the information on the channel sensing operation indicates the second type.   
     
     
         9 . The method of  claim 6 , wherein the variable time period for the first type is randomly selected based on a contention window for the UE. 
     
     
         10 . The method of  claim 9 , wherein a value of the contention window is determined based on a new data indicator (NDI) value for a hybrid automatic repeat request (HARQ) process. 
     
     
         11 . A user equipment (UE) for receiving information in a wireless communication system, the UE comprising:
 a transceiver; and   a controller coupled with the transceiver and configured to control to:
 receive, from a base station, information on a channel sensing operation of the UE in an unlicensed band, wherein the information on the channel sensing operation indicates one of a first type performing the channel sensing operation using a variable time period, a second type performing the channel sensing operation using a fixed time period, and a third type not performing the channel sensing operation, and 
 transmit an uplink signal based on the information on the channel sensing operation. 
   
     
     
         12 . The UE of  claim 11 , wherein the information on the channel sensing operation indicates the third type in case that a gap from an end of a downlink (DL) transmission to a beginning of a uplink (UL) transmission is not greater than a predetermined time. 
     
     
         13 . The UE of  claim 11 , wherein the controller is configured to:
 transmit the uplink signal after sensing a channel for the unlicensed band during the variable time period in case that the information on the channel sensing operation indicates the first type, and   transmit the uplink signal after sensing the channel for the unlicensed band during the fixed time period in case that the information on the channel sensing operation indicates the second type.   
     
     
         14 . The UE of  claim 11 , wherein the variable time period for the first type is randomly selected based on a contention window for the UE. 
     
     
         15 . The UE of  claim 14 , wherein a value of the contention window is determined based on a new data indicator (NDI) value for a hybrid automatic repeat request (HARQ) process. 
     
     
         16 . A method for receiving information by a user equipment (UE) in a wireless communication system, the method comprising:
 receiving, from a base station, information on a channel sensing operation of the UE in an unlicensed band, wherein the information on the channel sensing operation indicates one of a first type performing the channel sensing operation using a variable time period, a second type performing the channel sensing operation using a fixed time period, and a third type not performing the channel sensing operation; and   transmitting an uplink signal based on the information on the channel sensing operation.   
     
     
         17 . The method of  claim 16 , wherein the information on the channel sensing operation indicates the third type in case that a gap from an end of a downlink (DL) transmission to a beginning of a uplink (UL) transmission is not greater than a predetermined time. 
     
     
         18 . The method of  claim 16 , further comprising:
 transmitting the uplink signal after sensing a channel for the unlicensed band during the variable time period in case that the information on the channel sensing operation indicates the first type; and   transmitting the uplink signal after sensing the channel for the unlicensed band during the fixed time period in case that the information on the channel sensing operation indicates the second type.   
     
     
         19 . The method of  claim 16 , wherein the variable time period for the first type is randomly selected based on a contention window for the UE. 
     
     
         20 . The method of  claim 19 , wherein a value of the contention window is determined based on a new data indicator (NDI) value for a hybrid automatic repeat request (HARQ) process.