PDCCH Search Space Layout Across Sub-Bands for Reliable Decoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently decoding physical downlink control channels (PDCCH) due to limited frequency diversity and low aggregation levels, particularly in scenarios involving multiple sub-bands or component carriers.
Innovation Solution
A method and apparatus for wireless communications that involve configuring a user equipment (UE) to perform blind decodes across multiple sub-bands or component carriers, utilizing a virtual cell concept where PDCCH candidates are distributed across these bands, and associating search space sets to enhance decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH candidates are monitored across multiple sub-bands with distributed search space sets, then frequency diversity and decoding reliability are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent divides the frequency spectrum into multiple sub-bands, each containing search space sets with PDCCH candidates. This segmentation allows the UE to distribute decoding operations across multiple frequency regions, improving frequency diversity and reliability while managing complexity through structured organization of search spaces across sub-bands
Solution Approach 2:
The patent introduces a multi-dimensional search space structure that spans multiple sub-bands and time slots. By organizing PDCCH candidates across both frequency (sub-bands) and time (slots) dimensions, the system achieves enhanced diversity without proportionally increasing processing complexity, as the UE can leverage correlations across dimensions
2Reliability
If multiple search space sets are configured across sub-bands, then frequency diversity is enhanced, but blind decode operations and processing overhead increase
Solution Approach 1:
The patent configures search space sets and PDCCH candidates in advance across multiple sub-bands and time slots. This preliminary configuration allows the UE to prepare decoding parameters and search patterns beforehand, reducing real-time processing overhead while maintaining enhanced frequency diversity through the pre-distributed candidate structure
Solution Approach 2:
The search space sets are designed to serve multiple functions: they provide frequency diversity, enable blind decoding across sub-bands, and support both initial and retransmission PDCCH candidates. This multi-functionality reduces the need for separate dedicated structures, improving overall decoding efficiency while maintaining reliability
3Reliability
If PDCCH candidates are distributed across multiple sub-bands, then frequency diversity is improved, but monitoring occasions and time resources are increased
Solution Approach 1:
The patent implements periodic monitoring occasions where PDCCH candidates are monitored at specific time slots across multiple sub-bands. This periodic structure allows the UE to concentrate decoding operations into discrete time windows rather than continuously monitoring, reducing overall time consumption while maintaining frequency diversity through the distributed candidate arrangement across periods
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A UE may receive configuration information that indicates a plurality of monitoring occasions in multiple sub-bands for monitoring of a set of physical downlink control channel (PDCCH). The set of PDCCH candidates may be distributed across the multiple sub-bands. The UE may perform a first set of blind decodes during a first monitoring occasion. The first monitoring occasion may be associated with a first search space set of a first PDCCH core resource set (CORESET) in a first sub-band. The UE may perform a second set of blind decodes during a second monitoring occasion. The second monitoring occasion may be associated with a second search space set of a second PDCCH CORESET in a second sub-band. The configuration information may associate the first search space set with the second search space set.