PDCCH Candidate Prioritization for UE Processing Overload
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Solution Overview
Problem
The existing wireless communication systems face challenges in efficiently and accurately transmitting and receiving Physical Downlink Control Channel (PDCCH) signals due to exceeding processing capabilities and ambiguity in determining PDCCH candidates, especially when monitoring timings of multiple search space sets overlap.
Innovation Solution
The proposed method involves prioritizing PDCCH candidates based on channel estimation capability and configuring search space sets to limit the number of blind-decodings, allowing the user equipment to skip some candidates when the channel estimation capability is exceeded, thereby reducing processing complexity and improving transmission and reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of PDCCH candidates for blind decoding is increased to improve coverage and reliability, then the channel estimation capability is exceeded and processing complexity increases
Solution Approach 1:
The patent segments the search space into multiple search space sets, each with a limited number of PDCCH candidates. This segmentation allows the UE to divide the blind decoding process into manageable portions across different sets, reducing the processing complexity for each individual set while maintaining overall reliability through the aggregated coverage of multiple sets.
Solution Approach 2:
The patent introduces dynamic prioritization mechanisms where search space sets can be dynamically prioritized based on traffic conditions, QoS requirements, and UE capability. This allows the system to adaptively adjust which search space sets are monitored first or with higher priority, optimizing the balance between reliability and processing complexity in real-time.
2Adaptability or versatility
If multiple search space sets are configured to improve scheduling flexibility, then monitoring timing overlap occurs causing ambiguity in PDCCH candidate determination
Solution Approach 1:
The patent introduces asymmetric monitoring configurations where different search space sets have different monitoring periodicities, offsets, and candidate numbers. This asymmetry allows the system to configure search space sets with non-overlapping or minimally overlapping monitoring timings, reducing ambiguity while maintaining scheduling flexibility through diverse configuration options.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports its processing capability and monitoring status to the network. Based on this feedback, the network can adjust the configuration of search space sets to avoid problematic overlaps, ensuring clear PDCCH candidate determination while maintaining the desired scheduling flexibility.
3Measurement precision
If the number of blind decodings is increased to enhance detection accuracy, then the channel estimation capability is exceeded
Solution Approach 1:
The patent applies partial action by limiting the number of blind decodings per search space set to a manageable level that does not exceed UE capability. Instead of requiring the UE to perform excessive blind decodings across a single large search space, the system distributes the detection task across multiple smaller search space sets, achieving adequate detection accuracy without overwhelming the channel estimation capability.
Solution Approach 2:
The patent changes key parameters such as the number of candidates per search space set, monitoring periodicity, and aggregation levels to optimize the balance between detection accuracy and channel estimation capability. By adjusting these parameters, the system can achieve sufficient PDCCH detection accuracy while keeping the channel estimation burden within UE capabilities.
Data Source
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AI summary
One aspect of the present disclosure provides a method for detecting, by a user equipment, a physical downlink control channel (PDCCH) signal in a wireless communication system, the method comprising: receiving configurations for a plurality of search space sets from a base station; determining, based on a monitoring periodicity of each of the plurality of search space sets, search space sets for which the user equipment should monitor a PDCCH signal for a specific unit time; and attempting blind-detection selectively for only a part of PDCCH candidates included in the determined search space sets when a number of PDCCH candidates and a number of control channel elements (CCEs) included in the determined search space sets exceed a maximum number of candidates or a maximum number of CCEs, respectively, wherein in selection of PDCCH candidates for attempting the blind-detection, the user equipment firstly selects PDCCH candidates from a first search space set related to a common search space (CSS) among the determined search space sets.