SEARCH SPACE OVERBOOKING AND PRUNING
Methods, systems, and devices for wireless communication are described. In some cases, due to blind decoding and channel estimation (CE) limits, one or more user equipment (UE) specific search sets may be pruned for blind decoding and/or CE purposes. For instance, after hashing a set of common decoding candidates to control channel elements (CCEs) within the control region, the UE specific search sets may be pruned so as to conform to the blind decode limitation, since a common search space has already occupied a portion of the total blind decode limit. Following pruning, the UE may hash the sets of UE-specific decoding candidates associated with the one or more UE specific search sets to CCEs within the control region. The UE may further prune UE specific search sets, based on CE limits, while reusing CE for overlapping hashed locations.
1 . A method for wireless communication at a user equipment (UE), comprising:
determining a number of available control channel elements (CCEs) of a control region for each of one or more search space sets based at least in part on a total number of available CCEs, the one or more search space sets associated with one or more sets of decoding candidates;
allocating, to a set of decoding candidates admitted for monitoring, a first subset of the one or more sets of decoding candidates that have been hashed to a first subset of CCEs of the control region based at least in part on a number of available CCEs allocated for a first search space set of the one or more search space sets, wherein the set of decoding candidates admitted for monitoring comprises a second subset of the one or more sets of decoding candidates having hashed locations overlapping with the first subset of CCEs;
determining that a number of non-overlapping CCEs corresponding to the set of decoding candidates admitted for monitoring is less than the total number of available CCEs;
allocating, to the set of decoding candidates admitted for monitoring and responsive to the determination that the number of non-overlapping CCEs is less than the total number of available CCEs, a third subset of the one or more sets of decoding candidates having hashed locations that are non-overlapping with the first subset of CCEs; and
monitoring the control region for the set of decoding candidates admitted for monitoring.