Method and apparatus for downlink control information (dci) content processing considering active downlink (dl) bandwidth part (bwp) change in a wireless communication system

Abstract

A method and apparatus are disclosed from the perspective of a User Equipment (UE). In one embodiment, the method includes the UE being configured with a first DL (Downlink) BWP (Bandwidth Part) and a second DL BWP. The method also includes the UE receiving and/or monitoring a DCI (Downlink Control Information) in a scheduling CORESET (Control Resource Set) in the first DL BWP, and for determining size of the DCI for decoding, the UE determines whether a TCI (Transmission Configuration Indication) field is present in the DCI or not based on a parameter of the scheduling CORESET before the UE decodes the DCI successfully. The method further includes the UE truncates or pads zero-bits to at least one field (other than the TCI field) in the DCI based on configuration of the second DL BWP after the UE decodes successfully the DCI, wherein a BWP indicator field in the DCI indicates the second DL BWP different from the first DL BWP. In addition, the method includes the UE determines whether the TCI field is present in the DCI or not based on the parameter of the scheduling CORESET in the first DL BWP after the UE decodes successfully the DCI, wherein a BWP indicator field in the DCI indicates the second DL BWP different from the first DL BWP.

What is claimed is: 
     
         1 . A method of a User Equipment (UE), comprising:
 being configured with a first Downlink (DL) Bandwidth Part (BWP) and a second DL BWP;   receiving and/or monitoring a Downlink Control Information (DCI) in a scheduling Control Resource Set (CORESET) in the first DL BWP, and for determining size of the DCI for decoding, and determining whether a Transmission Configuration Indication (TCI) field is present in the DCI or not based on a parameter of the scheduling CORESET in the first DL BWP before the UE successfully decodes the DCI;   truncating or padding zero-bits to, after successfully decoding the DCI, at least one field, other than the TCI field, in the DCI based on configuration of the second DL BWP, and determining whether the TCI field is present in the DCI or not based on the parameter of the scheduling CORESET in the first DL BWP, wherein a BWP indicator field in the DCI indicates the second DL BWP different from the first DL BWP regardless of the parameter of one or more CORESETs in the second DL BWP or configuration of the second DL BWP; and   receiving a corresponding Physical Downlink Shared Channel (PDSCH), scheduled by the DCI, in the second DL BWP.   
     
     
         2 . The method of  claim 1 , wherein the parameter is TCI-PresentInDCL. 
     
     
         3 . The method of  claim 1 , further comprising:
 receiving the corresponding PDSCH based on a TCI state indicated by the TCI field in the DCI when the TCI field is determined to be present in the DCI, wherein the TCI state is configured and/or activated for receiving PDSCH transmitted in the second DL BWP.   
     
     
         4 . The method of  claim 3 , further comprising:
 receiving the corresponding PDSCH via antenna port Quasi Co-Location (QCL) information derived from a reference signal in a Reference Symbol (RS) set with respect to a one or more QCL type parameters given by the TCI state.   
     
     
         5 . The method of  claim 1 , wherein the one or more CORESETs are configured in the second DL BWP and the one or more CORESETs comprise a first CORESET with a TCI field absence in DCI, and the one or more CORESETs comprise a second CORESET with a TCI field presence in DCI. 
     
     
         6 . The method of  claim 1 , wherein truncating the at least one field means that the UE only uses partial bits of the field in the DCI after the UE successfully decodes the DCI. 
     
     
         7 . The method of  claim 1 , wherein padding zero-bits to the at least one field means the UE prepends one or more zero-bits to the at least one field in the DCI after the UE successfully decodes the DCI. 
     
     
         8 . The method of  claim 1 , wherein a field size of the at least one field is determined based on configuration of the first DL BWP before the UE successfully decodes the DCI. 
     
     
         9 . The method of  claim 1 , wherein a field size of the at least one field which is determined based on configuration of the first DL BWP is different from a field size of the at least one field which is determined based on configuration of the second DL BWP. 
     
     
         10 . The method of  claim 1 , further comprising:
 padding zero-bits to the at least one field after the UE successfully decodes the DCI if a field size of the at least one field determined based on configuration of the second DL BWP is larger than a field size of the at least one field determined based on configuration of the first DL BWP; and   truncating the at least one field after the UE successfully decodes the DCI if a field size of the at least one field determined based on configuration of the second DL BWP is smaller than a field size of the at least one field determined based on configuration of the first DL BWP.   
     
     
         11 . The method of  claim 1 , wherein the at least one field is frequency domain resource assignment field, and the UE receives the corresponding PDSCH on frequency domain resources, which is indicated by a frequency domain resource assignment field value with zero-bits padding or truncation performed based on configuration of the second DL BWP. 
     
     
         12 . The method of  claim 1 , further comprising:
 not truncating or padding zero-bits to the TCI field when a field size of the TCI field, based on the determination of whether the TCI field is present in the DCI after successfully decoding the DCI, is the same as or is not different than a field size of the TCI field, based on the determination of whether the TCI field is present in the DCI before successfully decoding the DCI.   
     
     
         13 . A method of a User Equipment (UE), comprising:
 receiving configuration for configuring the UE with a first Downlink (DL) Bandwidth Part (BWP) and a second DL BWP;   receiving and/or monitoring a Downlink Control Information (DCI) in a scheduling Control Resource Set (CORESET) in the first DL BWP, and for determining size of the DCI for decoding;   determining whether a Transmission Configuration Indication (TCI) field is present in the DCI or not based on a parameter of the scheduling CORESET in the first DL BWP before the UE successfully decodes the DCI;   truncating or padding zero-bits, after the UE successfully decodes the DCI, to at least one field, other than the TCI field, in the DCI based on configuration of the second DL BWP, and determining whether the TCI field is present in the DCI or not based on the parameter of the scheduling CORESET in the first DL BWP, wherein a BWP indicator field in the DCI indicates the second DL BWP different from the first DL BWP regardless of the parameter of one or more CORESETs in the second DL BWP or configuration of the second DL BWP; and   receiving a corresponding Physical Downlink Shared Channel (PDSCH), scheduled by the DCI, in the second DL BWP.   
     
     
         14 . The method of  claim 13 , further comprising:
 receiving the corresponding PDSCH based on a TCI state indicated by the TCI field in the DCI when the TCI field is determined to be present in the DCI, wherein the TCI state is configured and/or activated for receiving PDSCH transmitted in the second DL BWP.   
     
     
         15 . The method of  claim 14 , further comprising:
 receiving the corresponding PDSCH via antenna port Quasi Co-Location (QCL) information derived from a reference signal in a Reference Symbol (RS) set with respect to one or more QCL type parameters given by the TCI state.   
     
     
         16 . The method of  claim 13 , further comprising:
 determining, after successfully decoding the DCI, whether the TCI field is present in the DCI or not based on the parameter of the scheduling CORESET in the first DL BWP regardless of the parameter of the one or more CORESETs in the second DL BWP or configuration of the second DL BWP.   
     
     
         17 . The method of  claim 13 , wherein the one or more CORESETs are configured in the second DL BWP and the one or more CORESETs comprise a first CORESET with a TCI field absence in DCI and the more than one CORESETs comprise a second CORESET with a TCI field presence in DCI. 
     
     
         18 . The method of  claim 13 , further comprising:
 not truncating or padding zero-bits to the TCI field when a field size of the TCI field, based on determining whether the TCI field is present in the DCI after successfully decoding the DCI, is the same as or is not different than a field size of the TCI field, based on the determination of whether the TCI field is present in the DCI before successfully decoding the DCI.   
     
     
         19 . The method of  claim 13 , wherein a field size of the at least one field is determined based on configuration of the first DL BWP before the UE successfully decodes the DCI, or a field size of the at least one field which is determined based on configuration of the first DL BWP is different from a field size of the at least one field which is determined based on configuration of the second DL BWP. 
     
     
         20 . A User Equipment (UE), comprising:
 a memory; and   a processor operatively coupled to the memory, wherein the processor is configured to execute a program code to:
 receive configuration for configuring the UE with a first Downlink (DL) Bandwidth Part (BWP) and a second DL BWP; 
 receive and/or monitor a Downlink Control Information (DCI) in a scheduling Control Resource Set (CORESET) in the first DL BWP, and for determining size of the DCI for decoding; 
 determine whether a Transmission Configuration Indication (TCI) field is present in the DCI or not based on a parameter of the scheduling CORESET in the first DL BWP before the UE successfully decodes the DCI; 
 truncate or pad zero-bits, after the UE successfully decodes the DCI, to at least one field, other than the TCI field, in the DCI based on configuration of the second DL BWP, and determine whether the TCI field is present in the DCI or not based on the parameter of the scheduling CORESET in the first DL BWP, wherein a BWP indicator field in the DCI indicates the second DL BWP different from the first DL BWP regardless of the parameter of one or more CORESETs in the second DL BWP or configuration of the second DL BWP; and 
 receive a corresponding Physical Downlink Shared Channel (PDSCH), scheduled by the DCI, in the second DL BWP.