Apparatus and method for detecting control channel in wireless communication system

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). The present disclosure provides a method for downlink reception, including: determining a downlink receiving state on an active downlink Bandwidth Part ‘BWP’ to which switching is made; and performing downlink reception according to the determined downlink receiving state on the active downlink BWP to which switching is made. The present disclosure also provides a method for performing PDCCH detection, and a corresponding UE and a computer readable medium.

What is claimed is: 
     
         1 . A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
 determining a reference subcarrier spacing among a plurality subcarrier spacing;   identifying a number of serving cells with the reference subcarrier spacing;   identifying a number of serving cells for which physical downlink control channels (PDCCH)s can be detected;   determining a sum of maximum number of detections of PDCCHs of the UE in each slot of the number of serving cells with the reference subcarrier spacing; and   monitoring PDCCH based on the sum of maximum number of detections of PDCCHs.   
     
     
         2 . The method of  claim 1 , the method further comprising:
 determining a sum of maximum numbers of detections of non-overlapping CCEs in each slot of the number of serving cells with the reference subcarrier spacing, and   wherein the monitoring PDCCH comprises:
 monitoring PDCCH further based on the sum of maximum number of detections of non-overlapping CCEs. 
   
     
     
         3 . The method of  claim 2 , wherein the monitoring the PDCCH is not required monitor more than the sum of maximum number of detections of PDCCHs or the sum of maximum number of detections of non-overlapping CCEs. 
     
     
         4 . The method of  claim 3 ,
 wherein the determining the sum of maximum number of detections of PDCCHs comprises identifying a maximum number of PDCCHs of different sizes detected in each slot of each serving cell with the reference subcarrier spacing, and   wherein the determining the sum of maximum numbers of detections of non-overlapping CCEs comprises identifying a maximum number of non-overlapping CCEs detected in each slot of each serving cell with the reference subcarrier spacing.   
     
     
         5 . The method of  claim 4 ,
 wherein the sum of maximum number of detections of PDCCHs is determined based on the number of serving cells for which PDCCHs can be detected and the maximum number of PDCCHs of different sizes, and   wherein the sum of maximum numbers of detections of non-overlapping CCEs is determined based on the number of serving cells for which PDDCHs can be detected and the maximum number of non-overlapping CCEs.   
     
     
         6 . The method of  claim 1 ,
 wherein the UE is configured with carrier aggregation (CA) or dual connectivity (DC), a CA or DC capability of the UE supports a plurality of serving cells or a plurality of BWPs.   
     
     
         7 . The method of  claim 1 ,
 wherein the reference subcarrier spacing is for a first serving cell which is different from a subcarrier spacing for a second serving cell.   
     
     
         8 . A user equipment (UE) in a wireless communication system, the UE comprising:
 a transceiver, and   a controller coupled with the transceiver and configured to:
 determine a reference subcarrier spacing among a plurality subcarrier spacing, 
 identify a number of serving cells with the reference subcarrier spacing, 
 identify a number of serving cells for which physical downlink control channels (PDCCH)s can be detected, 
 determine a sum of maximum number of detections of PDCCHs of the UE in each slot of the number of serving cells with the reference subcarrier spacing, and 
 monitor PDCCH based on the sum of maximum number of detections of PDCCHs. 
   
     
     
         9 . The UE of  claim 8 , wherein the controller further configured to:
 determine a sum of maximum numbers of detections of non-overlapping CCEs in each slot of the number of serving cells with the reference subcarrier spacing, and   monitor PDCCH further based on the sum of maximum number of detections of non-overlapping CCEs.   
     
     
         10 . The UE of  claim 9 ,
 wherein the monitoring the PDCCH is not required monitor more than the sum of maximum number of detections of PDCCHs or the sum of maximum number of detections of non-overlapping CCEs.   
     
     
         11 . The UE of  claim 9 , wherein the controller further configured to:
 identify a maximum number of PDCCHs of different sizes detected in each slot of each serving cell with the reference subcarrier spacing, and   identify a maximum number of non-overlapping CCEs detected in each slot of each serving cell with the reference subcarrier spacing.   
     
     
         12 . The UE of  claim 11 ,
 wherein the sum of maximum number of detections of PDCCHs is determined based on the number of serving cells for which PDCCHs can be detected and the maximum number of PDCCHs of different sizes, and   wherein the sum of maximum numbers of detections of non-overlapping CCEs is determined based on the number of serving cells for which PDDCHs can be detected and the maximum number of non-overlapping CCEs.   
     
     
         13 . The UE of  claim 8 , wherein the UE is configured with carrier aggregation (CA) or dual connectivity (DC), a CA or DC capability of the UE supports a plurality of serving cells or a plurality of BWPs. 
     
     
         14 . The UE of  claim 8 , wherein the reference subcarrier spacing is for a first serving cell which is different from a subcarrier spacing for a second serving cell. 
     
     
         15 . A method performed by a base station (BS) in a wireless communication system, the method comprising:
 transmitting, to a user equipment (UE), information associated with a plurality subcarrier spacing, wherein a reference subcarrier spacing is determined from among the plurality subcarrier spacing; and   transmitting, to the UE, a physical downlink control channel (PDCCH),   wherein a number of serving cell with the reference subcarrier spacing and a number of serving cells for which physical downlink control channels (PDCCHs) can be detected is identified based on the reference subcarrier spacing, and   wherein the PDCCH is monitored based on a sum of maximum number of detections of PDCCHs of the UE in each slot of the number of serving cells with the reference subcarrier spacing.   
     
     
         16 . The method of  claim 15 , wherein the PDCCH is further monitored based on the a sum of maximum number of detections of non-overlapping CCEs in each slot of the number of serving cells with the reference subcarrier spacing. 
     
     
         17 . The method of  claim 16 , wherein the PDCCH is not required monitor than the sum of maximum number of detections of PDCCHs or the sum of maximum number of detections of non-overlapping CCEs. 
     
     
         18 . The method of  claim 17 ,
 wherein the sum of maximum number of detections of PDCCHs is determined based on a maximum number of PDCCHs of different sizes detected in each slot of each serving cell with the reference subcarrier spacing, and   wherein the sum of maximum numbers of detections of non-overlapping CCEs is determined based on a maximum number of non-overlapping CCEs detected in each slot of each serving cell with the reference subcarrier spacing.   
     
     
         19 . The method of  claim 18 ,
 wherein the sum of maximum number of detections of PDCCHs is determined based on the number of serving cells for which PDCCHs can be detected and the maximum number of PDCCHs of different sizes, and   wherein the sum of maximum numbers of detections of non-overlapping CCEs is determined based on the number of serving cells for which PDDCHs can be detected and the maximum number of non-overlapping CCEs.   
     
     
         20 . The method of  claim 18 , wherein the reference subcarrier spacing is for a first serving cell which is different from a subcarrier spacing for a second serving cell.