EPDCCH ECCE Distribution for Interference Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing interference from neighboring cells when receiving downlink control information through enhanced physical downlink control channels (EPDCCH), particularly in localized EPDCCH transmissions.
Innovation Solution
The method involves determining enhanced physical downlink control channel (EPDCCH) candidates per aggregation level in an EPDCCH physical resource block (PRB) set, with enhanced control channel elements (ECCEs) distributed within the EPDCCH PRB set, and shifting ECCEs to minimize interference, using equations to configure the search space and ensure efficient decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECCEs are distributed in the EPDCCH PRB set for localized EPDCCH transmission, then reception reliability of downlink control information is improved, but interference from neighboring cells increases
Solution Approach 1:
The patent divides the EPDCCH PRB set into multiple groups and distributes ECCEs across these groups. By segmenting the resource allocation and applying different shifts to different groups, the system maintains reception reliability through distributed transmission while reducing neighboring cell interference through the segmentation-based interference randomization.
Solution Approach 2:
The patent applies different shift values to different groups of ECCEs within the EPDCCH PRB set. This creates local variations in resource allocation patterns, where each group has optimized quality characteristics. The local quality principle allows the system to maintain high reception reliability in each group while the overall distribution pattern reduces interference from neighboring cells.
2Stability of the object's composition
If ECCEs are distributed across multiple PRB pairs, then frequency diversity is improved, but complexity of determining EPDCCH candidates increases
Solution Approach 1:
The patent introduces dynamic shift values that can be applied to different groups of ECCEs. These shifts dynamically adjust the resource allocation patterns across PRB pairs, enabling the system to achieve frequency diversity while managing complexity through structured dynamic adjustments rather than exhaustive search.
Solution Approach 2:
The patent changes the parameter of ECCE indexing by applying shift values to different groups. This parameter transformation simplifies the determination process by creating a predictable pattern for EPDCCH candidate locations, thereby reducing the complexity of searching through distributed ECCEs across multiple PRB pairs while maintaining frequency diversity.
3Reliability
If the number of ECCEs per EPDCCH candidate is increased, then robustness against interference is improved, but resource overhead increases
Solution Approach 1:
The patent applies partial shifting to different groups of ECCEs rather than uniformly increasing aggregation levels across all candidates. This partial action approach provides sufficient robustness against interference for each candidate while avoiding the excessive resource overhead that would result from uniformly increasing the number of ECCEs for all EPDCCH candidates.
Data Source
AI summary
A method for receiving downlink control information by a terminal in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: determining enhanced physical downlink control channel (EPDCCH) candidates per aggregation level in an enhanced physical downlink control channel physical resource block (EPDCCH PRB) set; and performing monitoring in a set of the EPDCCH candidates, wherein enhanced control channel elements (ECCE) constituting the respective EPDCCH candidates are distributed in the EPDCCH PRB set.