Subband operation for cross division duplex technology

Abstract

An apparatus and method are provided for performing a subband operation for cross division duplex (XDD) technology to enhance coverage in wireless communication systems. A method by a base station (BS) includes configuring a user equipment (UE) with a legacy uplink bandwidth part (UL BWP) or legacy downlink (DL) BWP and providing the UE with a UL subband or a DL subband in a full duplex operation.

What is claimed is: 
     
         1 . A method by a base station (BS), comprising:
 configuring a user equipment (UE) with a legacy uplink (UL) bandwidth part (BWP) or legacy downlink (DL) BWP; and   providing the UE with a UL subband or a DL subband in a full duplex operation.   
     
     
         2 . The method of  claim 1 ,
 wherein a frequency domain location of the UL subband or the DL subband provided by the BS to the UE is defined in a frequency domain as a set of a contiguous number of resource blocks (RBs) semi-statically indicated by a radio resource control (RRC) signaling.   
     
     
         3 . The method of  claim 2 ,
 wherein the frequency domain location of the UL subband or the DL subband provided by the BS to the UE is determined based on an offset from the associated legacy UL BWP or the associated legacy DL BWP, respectively, or from another reference point.   
     
     
         4 . The method of  claim 3 ,
 wherein the offset is based on a numerology of the legacy UL BWP or the legacy DL BWP.   
     
     
         5 . The method of  claim 3 ,
 wherein the subband and the legacy BWP are associated either by assigning a same identifier (ID) for the subband and the legacy BWP or based on confinement where the subband is fully contained in the associated BWP.   
     
     
         6 . The method of  claim 2 ,
 wherein parameters of the frequency domain are configured to be semi-statically or dynamically changed, and   wherein the parameters include a starting point, an ending point, or a length of the UL subband or the DL subband.   
     
     
         7 . The method of  claim 1 ,
 wherein a time domain location of the UL subband or the DL subband is provided by a legacy slot format indication and an indication of whether a region is the UL subband, the DL subband, no subband or is flexible.   
     
     
         8 . The method of  claim 1 ,
 wherein a time domain location of the UL subband or the DL subband is provided by two overlaying slot format indicating signals by which the UE determines a presence and location of the UL subband and the DL subband.   
     
     
         9 . The method of  claim 8 ,
 wherein a first slot format indicating signal is based on legacy slot format indication and a second slot format indicating signal is a bitmap.   
     
     
         10 . The method of  claim 9 ,
 wherein the bitmap indicates the presence of the UL subband or DL subband and the transmission direction is opposite of the transmission direction indicated by the first slot format indicating signal.   
     
     
         11 . The method of  claim 9 ,
 wherein the BS turns off the UL subband or DL subband and the UE operates on the legacy DL BWP or the legacy UL BWP based on the first slot format indicating signal.   
     
     
         12 . The method of  claim 11 ,
 wherein a turning off indication is carried in a group common-physical control channel (GC-PDCCH) or a medium access control-control element (MAC-CE) and is applied after a time gap that is either predefined or indicated by UE capability signaling.   
     
     
         13 . A base station (BS), comprising:
 at least one processor; and   at least one memory operatively connected with the at least one processor, the at least one memory storing instructions, which when executed, instruct the at least one processor to perform a method by:
 configuring a user equipment (UE) with a legacy uplink (UL) bandwidth part (BWP) or legacy downlink (DL) BWP; and 
 providing the UE with a UL subband or a DL subband in a full duplex operation. 
   
     
     
         14 . The BS of  claim 13 ,
 wherein a frequency domain location of the UL subband or the DL subband provided by the BS to the UE is defined in a frequency domain as a set of a contiguous number of resource blocks (RBs) semi-statically indicated by a radio resource control (RRC) signaling.   
     
     
         15 . The BS of  claim 14 ,
 wherein the frequency domain location of the UL subband or the DL subband provided by the BS to the UE is determined based on an offset from the associated legacy UL BWP or the associated legacy DL BWP, respectively, or from another reference point.   
     
     
         16 . The BS of  claim 15 ,
 wherein the offset is based on a numerology of the legacy UL BWP or the legacy DL BWP.   
     
     
         17 . The BS of  claim 14 ,
 wherein the contiguous number of RBs is indicated by a radio resource control (RRC) signaling.   
     
     
         18 . The BS of  claim 14 ,
 wherein a time domain location of the UL subband or the DL subband is provided by two overlaying slot format indicating signals by which the UE determines a presence and location of the UL subband and the DL subband.   
     
     
         19 . The BS of  claim 14 ,
 wherein parameters of the frequency domain are configured to be semi-statically or dynamically changed, and   wherein the parameters include a starting point, an ending point, and a length of the UL subband or the DL subband.   
     
     
         20 . The BS of  claim 13 ,
 wherein a time domain location of the UL subband or the DL subband is provided by a legacy slot format indication and an indication of whether a region is the UL subband, the DL subband, or is flexible.