Carrier aggregation configuration method and device for same

Abstract

Provided are a method and a device for selecting a channel of an unlicensed band in configuring carrier aggregation for a terminal using an unlicensed band cell which uses an unlicensed frequency band. The method may include: receiving, from a base station, channel candidate information of a secondary cell using an unlicensed frequency band; transmitting channel state information with respect to one or more channels generated using the channel candidate information; and adding, as the secondary cell, a channel selected on the basis of the channel state information by the base station; and a device.

1 - 18 . (canceled) 
     
     
         19 . A method for a user equipment (UE) to perform carrier aggregation (CA), the method comprising:
 receiving channel candidate information of a secondary cell that uses an unlicensed frequency band from a base station;   transmitting channel state information associated with one or more channels, which are generated using the channel candidate information; and   adding, as the secondary cell, a channel that the base station selects based on the channel state information,   wherein the channel state information includes information on whether each of the one or more channels is used,   wherein the information on whether each of the one or more channels is used is determined based on a signal strength of each of the one or more channels, and   wherein the secondary cell is selected based on the channel state information and a predetermined threshold value.   
     
     
         20 . The method as claimed in  claim 19 , wherein the channel candidate information includes at least one of unlicensed frequency band information associated with each of the one or more channels, information associated with the number of channel candidates, and channel candidate list information,
 wherein the channel candidate information is received through a high layer signaling of a primary cell.   
     
     
         21 . The method as claimed in  claim 19 , wherein the channel state information includes signal strength information. 
     
     
         22 . The method as claimed in  claim 19 , further comprising:
 transmitting at least one of channel information of a primary cell and reference signal measurement information associated with the secondary cell,   wherein the base station selects a channel of the secondary cell by further using location information of the UE which is calculated based on at least one of the channel information of the primary cell and the reference signal measurement information associated with the secondary cell.   
     
     
         23 . The method as claimed in  claim 19 , further comprising:
 receiving a reference signal of the secondary cell from the base station,   wherein the reference signal of the secondary cell is a cell specific reference signal that is transmitted in a channel of the unlicensed frequency band by using physical cell identification information that is the same as that of the primary cell.   
     
     
         24 . The method as claimed in  claim 19 , wherein the channel candidate information further includes at least one of transmission power information of a secondary cell reference signal, transmission location information, and transmission period information. 
     
     
         25 . A method for a base station to configure carrier aggregation (CA), the method comprising:
 transmitting, to a user equipment (UE), channel candidate information of a secondary cell that uses an unlicensed frequency band;   receiving channel state information associated with one or more channels, which are generated based on the channel candidate information; and   additionally, configuring a channel having the smallest signal interference as a secondary cell of the UE, based on the channel state information,   wherein the channel state information includes information on whether each of the one or more channels is used,   wherein the information on whether each of the one or more channels is used is determined based on a signal strength of each of the one or more channels, and   wherein the secondary cell is selected based on the channel state information and a predetermined threshold value.   
     
     
         26 . The method as claimed in  claim 25 , wherein the channel candidate information includes at least one of unlicensed frequency band information associated with each of the one or more channels, information associated with the number of channel candidates, and channel candidate list information,
 wherein the channel candidate information is transmitted through a high layer signaling of a primary cell.   
     
     
         27 . The method as claimed in  claim 25 , wherein the channel state information includes at least one of information associated with whether each of the one or more channels is used and signal strength information. 
     
     
         28 . The method as claimed in  claim 25 , further comprising:
 receiving channel information of a primary cell or reference signal measurement information associated with the secondary cell; and   calculating location information of the UE based on at least one of the channel information of the primary cell and the reference signal measurement information associated with the secondary cell,   wherein a channel that is additionally configured as the secondary cell is selected based on the channel state information and the location information of the UE.   
     
     
         29 . The method as claimed in  claim 25 , further comprising:
 transmitting, to the UE, a reference signal of the secondary cell,   wherein the reference signal of the secondary cell is a cell specific reference signal that is transmitted in a channel of the unlicensed frequency band by using physical cell identification information that is the same as that of the primary cell.   
     
     
         30 . The method as claimed in  claim 25 , wherein the channel candidate information further includes at least one of transmission power information of the secondary cell reference signal, transmission location information, and transmission period information. 
     
     
         31 . A user equipment (UE) that performs carrier aggregation, the UE comprising:
 a receiving unit configured to receive, from a base station, channel candidate information of a secondary cell that uses an unlicensed frequency band;   a transmitting unit configured to transmit channel state information associated with one or more channels, which are generated using the channel candidate information; and   a controller configured to add, as the secondary cell, a channel that the base station selects based on the channel state information,   wherein the channel state information includes information on whether each of the one or more channels is used,   wherein the information on whether each of the one or more channels is used is determined based on a signal strength of each of the one or more channels, and   wherein the secondary cell is selected based on the channel state information and a predetermined threshold value.   
     
     
         32 . The UE as claimed in  claim 31 , wherein the channel candidate information includes at least one of unlicensed frequency band information associated with each of the one or more channels, information associated with the number of channel candidates, and channel candidate list information, wherein the channel candidate information is received through a high layer signaling of a primary cell. 
     
     
         33 . The UE as claimed in  claim 31 , wherein the channel state information includes at least one of information associated with whether each of the one or more channels is used and signal strength information. 
     
     
         34 . The UE as claimed in  claim 31 , wherein the transmitting unit further transmits channel information of a primary cell or reference signal measurement information associated with the secondary cell,
 wherein the base station selects a channel of the secondary cell by further using location information of the UE that is calculated based on at least one of the channel information of the primary cell and the reference signal measurement information associated with the secondary cell.   
     
     
         35 . The UE as claimed in  claim 31 , wherein the receiving unit further receives a reference signal of the secondary cell from the base station,
 wherein the reference signal of the secondary cell is a cell specific reference signal that is transmitted in a channel of the unlicensed frequency band by using physical cell identification information that is the same as that of the primary cell.   
     
     
         36 . The UE as claimed in  claim 31 , wherein the channel candidate information further includes at least one of transmission power information of a secondary cell reference signal, transmission location information, and transmission period information.