Radio terminal, radio access networ node, and method therefor

Abstract

A radio terminal ( 12 ) transmits, to a radio access network (RAN) node ( 11 ) in a radio access network (RAN), an indication indicating whether a measurement gap for inter-bandwidth part (BWP) measurement among BWPs included in a plurality of downlink BWPs is required. The downlink BWPs are included within one system bandwidth. Further, the radio terminal ( 12 ) receives, from the RAN node ( 11 ), a measurement configuration including a measurement gap configuration for one or more BWPs included in the downlink BWPs. It is thus, for example, possible to allow a radio terminal to be configured with a proper measurement gap for inter-BWP measurement within one carrier bandwidth.

1 . A method for a User Equipment (UE), the method comprising:
 receiving a Radio Resource Control (RRC) Reconfiguration message that includes first configuration information corresponding to a first bandwidth part and second configuration information corresponding to a second bandwidth part;   monitoring a radio link on the first bandwidth part based on first Radio Link Monitoring (RLM) configuration information included in the received first configuration information if an active bandwidth part of the UE is the first bandwidth part;   receiving Downlink Control Information (DCI) on Physical Downlink Control Channel (PDCCH);   switching, based on the received DCI, the active bandwidth part of the UE from the first bandwidth part to the second bandwidth part; and   monitoring a radio link on the second bandwidth part based on second RLM configuration information included in the received second configuration information if the active bandwidth part of the UE is the second bandwidth part.   
     
     
         2 . The method according to  claim 1 , wherein each of the first and the second RLM configuration information includes information of a reference signal that the UE uses for the RLM, wherein the reference signal is either Synchronization Signal/Physical Broadcast Channel block (SSB) or Channel State Information Reference Signal (CSI-RS). 
     
     
         3 . The method according to  claim 1 , wherein either the first or the second bandwidth part is an initial bandwidth part, 
     
     
         4 . A method for a base station, the method comprising:
 transmitting, to a User Equipment (UE), a Radio Resource Control (RRC) Reconfiguration message that includes first configuration information corresponding to a first bandwidth part and second configuration information corresponding to a second bandwidth part, wherein
 the first configuration information includes first Radio Link Monitoring (RLM) configuration information which is used by the UE to monitor a radio link on the first bandwidth part if an active bandwidth part of the UE is the first bandwidth part, and 
 the second configuration information includes second RLM configuration information which is used by the UE to monitor a radio link on the second bandwidth part if the active bandwidth part of the UE is the second bandwidth part; and 
   transmitting, to the UE, Downlink Control Information (DCI) on Physical Downlink Control Channel (PDCCH), the DCI causing the UE to switch the active bandwidth part of the UE from the first bandwidth part to the second bandwidth part.   
     
     
         5 . The method according to  claim 4 , wherein each of the first and the second RLM configuration information includes information of a reference signal that the UE uses for the RLM, wherein the reference signal is either Synchronization Signal/Physical Broadcast Channel block (SSB) or Channel State Information Reference Signal (CSI-RS). 
     
     
         6 . The method according to  claim 4 , wherein either the first or the second bandwidth part is an initial bandwidth part. 
     
     
         7 . A User Equipment comprising:
 a transceiver; and   a processor configured to:
 receive, via the transceiver, a Radio Resource Control (RRC) Reconfiguration message that includes first configuration information corresponding to a first bandwidth part and second configuration information corresponding to a second bandwidth part, 
 monitor a radio link on the first bandwidth part based on first Radio Link Monitoring (RLM) configuration information included in the received first configuration information if an active bandwidth part of the UE is the first bandwidth part, 
 receive, via the transceiver, Downlink Control Information (DCI) on Physical Downlink Control Channel (PDCCH), 
 switch, based on the received DCI, the active bandwidth part of the UE from the first bandwidth part to the second bandwidth part, and 
 monitor a radio link on the second bandwidth part based on second RLM configuration information included in the received second configuration information if the active bandwidth part of the UE is the second bandwidth part. 
   
     
     
         8 . A base station comprising:
 a transceiver; and   a processor configured to:
 transmit, to a User Equipment (UE) via the transceiver, a Radio Resource Control (RRC) Reconfiguration message that includes first configuration information corresponding to a first bandwidth part and second configuration information corresponding to a second bandwidth part, wherein
 the first configuration information includes first Radio Link Monitoring (RLM) configuration information which is used by the UE to monitor a radio link on the first bandwidth part if an active bandwidth part of the UE is the first bandwidth part, and 
 the second configuration information includes second RLM configuration information which is used by the UE to monitor a radio link on the second bandwidth part if the active bandwidth part of the UE is the second bandwidth part; and 
 
 transmit, to the UE via the transceiver, Downlink Control Information (DCI) on Physical Downlink Control Channel (PDCCH), the DCI causing the UE to switch the active bandwidth part of the UE from the first bandwidth part to the second bandwidth part.