Methods and apparatus for dynamic spectrum sharing

Abstract

A wireless transmit receive unit (WTRU) may be configured to monitor physical downlink control channel (PDCCH) candidates of a primary cell (PCell) and a secondary cell (SCell). The WTRU may be configured to determine a time duration for PDCCH candidate budgets for a set of symbols based on a subcarrier spacing associated with the PCell and a subcarrier spacing associated with the SCell. The WTRU may be configured to determine a maximum number of PDCCH candidates to allocate to a search space monitoring occasion of the PCell and the SCell. The maximum number of PDCCH candidates may be based on a per-cell ratio. The WTRU may be configured to allocate PDCCH candidates for the search space monitoring occasion of the PCell and the search space monitoring occasion of the SCell based on the determined maximum number of PDCCH candidates. The WTRU may be configured to decode an allocated PDCCH candidate.

What is claimed: 
     
         1 - 20 . (canceled) 
     
     
         21 . A method implemented by a wireless transmit receive unit (WTRU), the method comprising:
 receiving configuration information indicating that transmissions performed using a primary cell (PCell) can be scheduled via the PCell or a secondary cell (SCell);   determining a maximum number of physical downlink control channel (PDCCH) candidates to monitor in a slot for scheduling of the transmissions performed using the PCell;   determining that a first fraction of the maximum number of PDCCH candidates are applicable to PDCCH monitoring in the PCell and that a second fraction of the maximum number of PDCCH candidates are applicable to PDCCH monitoring in the SCell; and   decoding one or more PDCCH transmissions scheduling one or more of the transmissions on the PCell via the PCell or the SCell.   
     
     
         22 . The method of  claim 21 , further comprising:
 monitoring the PCell using the first fraction of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the PCell;   monitoring the SCell using the second fraction of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the SCell; and   stopping monitoring of PDCCH candidates in the SCell for scheduling of transmissions performed using the PCell based on deactivation of the SCell.   
     
     
         23 . The method of  claim 22 , further comprising receiving a medium access control (MAC) control element (CE) comprising an indication that deactivates the SCell. 
     
     
         24 . The method of  claim 23 , wherein the indication that deactivates the SCell indicates to monitor the maximum number of PDCCH candidates only in the PCell. 
     
     
         25 . The method of  claim 21 , wherein the configuration information further indicates the first fraction of the maximum number of PDCCH candidates that are applicable to PDCCH monitoring in the PCell. 
     
     
         26 . The method of  claim 21 , further comprising selecting search spaces in increasing order of priority until the maximum number of PDCCH candidates is reached. 
     
     
         27 . The method of  claim 21 , further comprising determining a time duration associated with the maximum number of PDCCH candidates based on a subcarrier spacing associated with the PCell or a subcarrier spacing associated with the SCell. 
     
     
         28 . The method of  claim 21 , further comprising determining the first fraction of the maximum number of PDCCH candidates for a scheduling cell based on the frequency bandwidth of an active bandwidth part of the scheduling cell over a total frequency bandwidth of the one or more active bandwidth parts configured to schedule on the scheduled cell. 
     
     
         29 . The method of  claim 21 , further comprising:
 determining a maximum number of non-overlapping control channel elements (CCEs) to monitor in the slot for scheduling of transmissions performed using the PCell; and   determining that a first fraction of the maximum number of non-overlapping CCEs are applicable to PDCCH monitoring in the PCell and that a second fraction of the maximum number of non-overlapping CCEs are applicable for PDCCH monitoring in the SCell.   
     
     
         30 . The method of  claim 29 , further comprising determining the first fraction of the maximum number of non-overlapping CCEs for a scheduling cell based on the frequency bandwidth of an active bandwidth part of the scheduling cell over a total frequency bandwidth of the one or more active bandwidth parts configured to schedule on the scheduled cell. 
     
     
         31 . A wireless transmit receive unit (WTRU) comprising a processor and a memory, wherein the processor is configured to:
 receive configuration information indicating that transmissions performed using a primary cell (PCell) can be scheduled via the PCell or a secondary cell (SCell);   determine a maximum number of physical downlink control channel (PDCCH) candidates to monitor in a slot for scheduling of the transmissions performed using the PCell;   determine that a first fraction of the maximum number of PDCCH candidates are applicable to PDCCH monitoring in the PCell and that a second fraction of the maximum number of PDCCH candidates are applicable to PDCCH monitoring in the SCell; and   decode one or more PDCCH transmissions scheduling one or more of the transmissions on the PCell via the PCell or the SCell.   
     
     
         32 . The WTRU of  claim 31 , wherein the processor and memory are further configured to:
 monitor the PCell using the first fraction of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the PCell;   monitor the SCell using the second fraction of the maximum number of PDCCH candidates applicable to PDCCH monitoring in the SCell; and   stop monitoring of PDCCH candidates in the SCell for scheduling of transmissions performed using the PCell based on deactivation of the SCell.   
     
     
         33 . The WTRU of  claim 31 , wherein the processor and memory are further configured to:
 receive a medium access control (MAC) control element (CE) comprising an indication that deactivates the SCell.   
     
     
         34 . The WTRU of  claim 33 , wherein the indication that deactivates the SCell indicates to monitor the maximum number of PDCCH candidates only in the PCell. 
     
     
         35 . The WTRU of  claim 31 , wherein the configuration information further indicates the first fraction of the maximum number of PDCCH candidates that are applicable to PDCCH monitoring in the PCell. 
     
     
         36 . The WTRU of  claim 31 , wherein the processor and the memory are further configured to select search spaces in increasing order of priority until the maximum number of PDCCH candidates is reached. 
     
     
         37 . The WTRU of  claim 31 , wherein the processor and the memory are further configured to determine a time duration associated with a maximum number of PDCCH candidates based on a subcarrier spacing associated with the PCell or a subcarrier spacing associated with the SCell. 
     
     
         38 . The WTRU of  claim 31 , wherein the processor and the memory are further configured to:
 determine the first fraction of the maximum number of PDCCH candidates for a scheduling cell based on the frequency bandwidth of an active bandwidth part of the scheduling cell over a total frequency bandwidth of the one or more active bandwidth parts configured to schedule on the scheduled cell.   
     
     
         39 . The WTRU of  claim 31 , wherein the processor and the memory are further configured to:
 determine a maximum number of non-overlapping control channel elements (CCEs) to monitor in the slot for scheduling of transmissions performed using the PCell; and   determine that a first fraction of the maximum number of non-overlapping CCEs are applicable to PDCCH monitoring in the PCell and that a second fraction of the maximum number of non-overlapping CCEs are applicable to PDCCH monitoring in the SCell.   
     
     
         40 . The WTRU of  claim 39 , wherein the processor and memory are further configured to:
 determine the first fraction of the maximum number of non-overlapping CCEs for a scheduling cell based on the frequency bandwidth of an active bandwidth part of the scheduling cell over a total frequency bandwidth of the one or more active bandwidth parts configured to schedule on the scheduled cell.