Method and apparatus for monitoring physical downlink control channel in wireless communication system

Abstract

A method of controlling monitoring of a physical downlink control channel (PDCCH) in user equipment (UE), the method including receiving wake up signal (WUS) configuration information from a base station; monitoring a WUS transmitted from the base station based on the WUS configuration information; detecting the WUS based on the monitoring; and monitoring at least one search space associated with the detected WUS.

What is claimed is: 
     
         1 . A method, performed by a user equipment (UE), of controlling monitoring of a physical downlink control channel (PDCCH), the method comprising:
 receiving, by the UE, wake up signal (WUS) configuration information from a base station;   receiving, by the UE, a WUS based on the WUS configuration information; and   monitoring at least one search space associated with the WUS.   
     
     
         2 . The method of  claim 1 , wherein the at least one search space associated with the WUS is determined based on a search space type, and the search space type comprises at least one of a UE-specific search space (USS) or a Type-3 common search space (CSS). 
     
     
         3 . The method of  claim 2 , wherein the Type-3 CSS comprises a CSS in which downlink control information including a cyclic redundancy check (CRC) scrambled by one of an interruption radio network temporary identifier (INT-RNTI), a slot format indication RNTI (SFI-RNTI), a transmit power control physical uplink shared channel RNTI (TPC-PUSCH-RNTI), a transmit power control physical uplink control channel RNTI (TPC-PUCCH-RNTI), a transmit power control-sounding reference symbols—RNTI (TPC-SRS-RNTI), a cell RNTI (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a modulation coding scheme cell RNTI (MCS-C-RNTI) is monitored. 
     
     
         4 . The method of  claim 1 , wherein the at least one search space associated with the WUS comprises all search spaces configured by the base station. 
     
     
         5 . The method of  claim 1 , wherein the at least one search space associated with the WUS is determined based on a search space index received from the base station. 
     
     
         6 . The method of  claim 5 , wherein the search space index is included in at least one of an upper layer signaling, a downlink control information (DCI), or a media access control (MAC) control element (MAC CE) received from the base station. 
     
     
         7 . The method of  claim 6 , wherein the DCI or the MAC CE comprises a WUS activation message. 
     
     
         8 . The method of  claim 5 , wherein the search space index is included in the WUS. 
     
     
         9 . The method of  claim 1 , wherein the monitoring of the at least one search space associated with the WUS comprises:
 monitoring a search space not associated with the WUS.   
     
     
         10 . The method of  claim 1 , wherein the monitoring of the at least one search space associated with the WUS comprises not monitoring a search space not associated with the WUS. 
     
     
         11 . A user equipment (UE) for controlling monitoring of a physical downlink control channel (PDCCH), the UE comprising:
 a transceiver; and   at least one controller coupled with the transceiver and configured to:   receive wake up signal (WUS) configuration information from a base station, receive a WUS based on the WUS configuration information; and   monitor at least one search space associated with the WUS.   
     
     
         12 . The UE of  claim 11 , wherein the at least one search space associated with the WUS is determined based on a search space type, and the search space type comprises at least one of a UE-specific search space (USS) or a Type-3 common search space (CSS). 
     
     
         13 . The UE of  claim 12 , wherein the Type-3 CSS comprises a CSS in which downlink control information including a cyclic redundancy check (CRC) scrambled by one of an interruption radio network temporary identifier (INT-RNTI), a slot format indication RNTI (SFI-RNTI), a transmit power control physical uplink shared channel RNTI (TPC-PUSCH-RNTI), a transmit power control physical uplink control channel RNTI (TPC-PUCCH-RNTI), a transmit power control-sounding reference symbols—RNTI (TPC-SRS-RNTI), a cell RNTI (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a modulation coding scheme cell RNTI (MCS-C-RNTI) is monitored. 
     
     
         14 . The UE of  claim 11 , wherein the at least one search space associated with the WUS comprises all search spaces configured by the base station. 
     
     
         15 . The UE of  claim 11 , wherein the at least one search space associated with the WUS is determined based on a search space index received from the base station. 
     
     
         16 . The UE of  claim 15 , wherein the search space index is included in at least one of an upper layer signaling, a downlink control information (DCI), or a media access control (MAC) control element (MAC CE) received from the base station. 
     
     
         17 . The UE of  claim 16 , wherein the DCI or the MAC CE comprises a WUS activation message. 
     
     
         18 . The UE of  claim 15 , wherein the search space index is included in the WUS. 
     
     
         19 . The UE of  claim 11 , wherein the at least one controller is configured to monitor a search space not associated with the WUS. 
     
     
         20 . The UE of  claim 11 , wherein the at least one controller is configured to not monitor a search space not associated with the WUS.