PDCCH Search Space Mapping via Dynamic Payload Adaptation
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in efficiently managing the physical downlink control channel (PDCCH) downlink control information (DCI) search space, leading to increased complexity and reduced flexibility in handling varying payload sizes, which affects UE performance, especially at the edge of coverage.
Innovation Solution
The method involves allowing user equipment (UE) to search for PDCCH based on multiple payload sizes associated with different aggregation levels and offsets within a search space, dynamically adapting the search to match signal-to-noise ratios and reduce the number of decode attempts, thereby improving network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE searches for PDCCH using fixed payload size mapping, then search space structure is simple, but flexibility in handling varying payload sizes is reduced
Solution Approach 1:
The patent implements dynamic payload size mapping where the UE determines the payload size based on the aggregation level and offset values during PDCCH search. Instead of a fixed mapping, the system dynamically adapts the payload size according to the search parameters, allowing flexible handling of varying payload sizes while maintaining a structured search approach.
Solution Approach 2:
The patent changes the parameter mapping from fixed to variable by introducing aggregation level and offset as determining factors for payload size. The payload size is no longer fixed but varies based on the aggregation level and offset values, enabling the system to adapt to different payload requirements while following a systematic search methodology.
2Reliability
If UE performs multiple decode attempts for different aggregation levels, then PDCCH decoding reliability is improved, but the number of decode attempts increases complexity
Solution Approach 1:
The patent applies partial action by having the UE perform decode attempts only for specific aggregation levels and offsets that are relevant to the current search conditions. Instead of exhaustively trying all possible aggregation levels and offsets, the UE uses the determined payload size to guide the decoding process, performing only the necessary decode attempts to achieve reliable PDCCH reception.
Solution Approach 2:
The patent implements feedback mechanisms where the UE receives indication information about the intended aggregation level and offset values, which guides the decoding process. This feedback allows the UE to focus decode attempts on the most likely correct parameters, improving reliability while reducing the overall number of attempts needed compared to blind decoding of all possibilities.
3Reliability
If UE uses fixed search space configuration, then implementation is simple, but performance at edge of coverage is reduced
Solution Approach 1:
The patent implements dynamic search space configuration where the UE adapts its search parameters based on the aggregation level and offset values received in the downlink control information. This dynamic approach allows the UE to optimize its search strategy for different coverage conditions, improving performance at the edge of coverage while maintaining a manageable configuration structure through systematic parameter determination.
Data Source
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AI summary
Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may identify a payload size, associated with performing a search for a physical downlink control channel (PDCCH), wherein the payload size is identified based at least in part on an aggregation level, associated with performing the search for the PDCCH, or an offset associated with performing the search for the PDCCH; and perform the search for the PDCCH based at least in part on the payload size. Numerous other aspects are provided.