5G NR PDCCH Decoding via CCE Interference Randomization
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Solution Overview
Problem
The existing designs for Physical Downlink Control Channel (PDCCH) transmission in 5G New Radio (NR) experience significant interference and decoding failures due to overlapping CCE transmission from nearby sectors, leading to degraded Random Access Channel (RACH) success rates and throughput.
Innovation Solution
The system configures differing Start CCE indexes for CORESETs across nearby sectors, separating them by frequency and/or time to maintain orthogonality and minimize interference, thereby improving PDCCH decoding accuracy and RACH success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CCE transmission is overlapped for MSG 2/MSG 4 with other cell PDCCH CORESET 1 CCE transmission, then system level throughput is maintained, but PDCCH decoding accuracy deteriorates due to inter-cell interference
Solution Approach 1:
The patent segments the CCE allocation by introducing separate CCE pools for different purposes: CCEs for MSG 2/MSG 4 transmissions are allocated from one pool while CCEs for other PDCCH CORESET 1 transmissions are allocated from another pool. This segmentation prevents overlap and interference between different types of transmissions, resolving the contradiction between maintaining throughput and ensuring decoding accuracy.
Solution Approach 2:
The patent applies local quality by assigning different CCE allocation strategies to different transmission types. Specifically, CCEs for MSG 2/MSG 4 are allocated with specific offset values (e.g., offset by 4 CCEs) compared to other PDCCH transmissions. This localized differentiation ensures that each transmission type receives appropriate CCE resources without interference, improving decoding accuracy while preserving overall system throughput.
2Measurement precision
If PDCCH transmission power levels are increased to improve decoding, then PDCCH decoding accuracy improves, but interference at system level increases
Solution Approach 1:
The patent extracts the interference problem by separating CCE allocations into distinct pools. By taking out MSG 2/MSG 4 CCE allocations from the general PDCCH CCE pool and creating a dedicated pool with specific offset rules, the patent eliminates the need to increase transmission power. This extraction resolves the contradiction by addressing interference through resource allocation rather than power adjustment.
3Measurement precision
If PDCCH transmission is separated in time to reduce interference, then PDCCH decoding accuracy improves, but system level throughput deteriorates
Solution Approach 1:
Instead of separating transmissions in the time dimension, the patent moves to the frequency/resource dimension by implementing separate CCE pools with different offset values. This dimensional shift allows simultaneous transmissions without interference, maintaining system throughput while improving decoding accuracy. The patent effectively resolves the contradiction by changing the separation dimension from time to frequency resources.
Data Source
AI summary
A method that uses CCE randomization to improve the detectability of PDCCH transmission in 5G NR applications to increase the RACH success rate and throughput at the system level. The method includes allocating PDCCH CCE for CORESETs for nearby sectors to be separated by frequency and/or by time providing differing Start CCE indexes for CORESETs according to the aggregation levels in PDCCH transmission.