Method and device for performing channel access process for transmitting different types of signals in wireless access system supporting unlicensed band

Abstract

The present invention relates to a wireless access system supporting an unlicensed band and provides methods for performing a channel access process for transmitting different types of signals, and devices supporting the same. According to one embodiment of the present invention, a method for transmitting different types of signals in a wireless access system supporting an unlicensed band can comprise the steps of: performing a first channel process (CAP) for transmitting a first type of signal; and transmitting a transmission burst including the first type of signal through the unlicensed band if it is determined that a serving cell (SCell) of the unlicensed band is in an idle state after performing the first CAP. At this time, at least one of first parameters for performing the first CAP can be set to be value less than that of second parameters for performing a second CAP for transmitting a second type of signal.

1 . A method of transmitting a downlink signal to a use equipment (UE) by a base station (BS) in a wireless access system supporting an unlicensed band, the method comprising:
 performing a first channel access procedure (CAP) for a transmission of a first type signal; and   transmitting the first type signal based on the first CAP,   wherein at least one first parameter of the first CAP is configured to a smaller value than second parameters of a second CAP for a transmission of a second type signal different from the first type signal,   
       wherein the first type signal is one of an uplink grant signal, a reference signal, or a common physical downlink control channel (PDCCH) signal. 
     
     
         2 . The method of  claim 1 , wherein the second type signal comprises a data signal. 
     
     
         3 . The method of  claim 1 , wherein the first parameters for the first CAP are determined to be parameters for a specific channel access priority class. 
     
     
         4 . The method of  claim 3 , wherein the first parameters for the first CAP are determined to be parameters for a channel access priority class having a value of 1. 
     
     
         5 . The method of  claim 1 , wherein the first parameters or the second parameters comprise at least a defer period parameter indicating a length of a defer period, a parameter indicating a minimum contention window size, and a parameter indicating a maximum contention window size. 
     
     
         6 . A base station (BS) for transmitting a downlink signal to a user equipment (UE) in a wireless access system supporting an unlicensed band, the BS comprising:
 a transmitter;   
       a receiver; and
 a processor operably coupled with the transmitter and the receiver and configured to: 
 perform a first channel access procedure (CAP) for a transmission of a first type signal; and 
 transmit the first type signal based on the first CAP, 
 wherein at least one first parameter of the first CAP is configured to a smaller value than second parameters of a second CAP for a transmission of a second type signal different from the first type signal, 
 
       wherein the first type signal is one of an uplink grant signal, a reference signal, or a common physical downlink control channel (PDCCH) signal. 
     
     
         7 . The BS of  claim 6 , wherein the second type signal comprises a data signal. 
     
     
         8 . The BS of  claim 6 , wherein the first parameters for the first CAP are determined to be parameters for a specific channel access priority class. 
     
     
         9 . The BS of  claim 8 , wherein the first parameters for the first CAP are determined to be parameters for a channel access priority class having a value of 1. 
     
     
         10 . The BS of  claim 6 , wherein the first parameters or the second parameters comprise at least a defer period parameter indicating a length of a defer period, a parameter indicating a minimum contention window size, and a parameter indicating a maximum contention window size.