PDCCH Blind Decoding Channel Estimation Reuse
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, blind decoding of downlink control channels faces challenges due to overlapping channel estimation between physical downlink control channel (PDCCH) candidates, leading to increased processing load and potential blocking issues.
Innovation Solution
The method involves performing blind decoding on a search space containing multiple PDCCH candidates with shared channel estimation, where candidates with lower aggregation levels are arranged to overlap with or be included within candidates of higher aggregation levels, allowing for reduced channel estimation computation and minimizing blocking by reusing channel estimation results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate channel estimation is performed for each PDCCH candidate, then decoding accuracy is improved, but processing load increases
Solution Approach 1:
The patent merges the channel estimation operations for multiple PDCCH candidates by identifying and reusing common channel estimation results. When PDCCH candidates overlap in time-frequency resources, the channel estimation performed for one candidate is reused for other candidates that share the same resources, thereby reducing the total number of channel estimation operations while maintaining decoding accuracy.
Solution Approach 2:
The patent performs channel estimation preliminarily for PDCCH candidates with higher aggregation levels first, since these candidates cover larger resource regions. The channel estimation results obtained from these preliminary operations are then reused for candidates with lower aggregation levels that overlap with the previously estimated regions, avoiding redundant estimation operations.
2Reliability
If more PDCCH candidates are monitored, then control information reception reliability is improved, but blocking issues increase
Solution Approach 1:
The patent structures PDCCH candidates with nested relationships where candidates of lower aggregation levels are positioned within or overlap with candidates of higher aggregation levels. This nesting allows the UE to monitor more candidates effectively by reusing channel estimation results from outer candidates, reducing processing blocking while maintaining comprehensive monitoring coverage.
Data Source
AI summary
The present invention discloses a method and device for receiving a downlink control channel according to various embodiments. A method and device are disclosed, the method for receiving a downlink control channel according to an aspect of the present invention includes: a step for receiving a subframe including a downlink control region; and a step for performing blind decoding on a search space in the downlink control region, wherein the search space includes a plurality of PDCCH candidates which correspond to respective aggregation levels and include control channel elements (CCEs), and each of the plurality of PDCCH candidates overlaps at least one PDCCH candidate.