PDSCH Rate Matching Around CORESET Overlap and Multiple PDCCHs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing rate matching for physical downlink shared channels (PDSCH) when their resources overlap with control resource sets (CORESET) due to limited processing capabilities and sparse control channel monitoring, leading to reduced scheduling flexibility and potential decoding issues.
Innovation Solution
Implement techniques for PDSCH rate matching around multiple PDCCHs within a CORESET by identifying and prioritizing PDCCHs based on unique indices, allowing for flexible scheduling without ambiguity, and incorporating guard periods for beam-switching delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDSCH resources overlap with CORESET resources containing multiple PDCCHs, then resource utilization efficiency improves, but scheduling flexibility deteriorates due to ambiguous rate matching requirements
Solution Approach 1:
The patent segments the overlapping resources by identifying specific PDCCH occasions within the CORESET that the PDSCH should rate-match around. Instead of treating the entire CORESET as a single block, the method divides it into individual PDCCH occasions based on monitoring configurations, allowing selective rate matching around only the relevant PDCCHs while leaving other resources available for PDSCH transmission.
Solution Approach 2:
The patent introduces dynamic behavior by adapting the rate matching pattern based on the actual PDCCH monitoring configuration and the specific PDCCH occasions detected in each slot. The UE dynamically determines which PDCCH occasions to rate-match around based on received DCI formats and monitoring schedules, rather than using a static rate matching pattern.
2Reliability
If PDSCH performs rate matching around all PDCCHs in CORESET, then decoding reliability improves, but processing complexity increases due to limited UE capabilities
Solution Approach 1:
The patent extracts only the necessary PDCCH occasions from the CORESET for rate matching purposes. Instead of rate matching around all PDCCHs in the CORESET, the method identifies and extracts specifically those PDCCH occasions that the UE is configured to monitor and that actually contain downlink assignments or are likely to contain uplink grants affecting PDSCH resources.
Solution Approach 2:
The patent applies partial action by performing rate matching around a subset of PDCCH occasions rather than all possible PDCCHs in the CORESET. The UE monitors only configured PDCCH occasions and performs rate matching around those, leaving other resources in the CORESET available for potential PDSCH transmission, thus balancing reliability with processing complexity.
3Productivity
If PDSCH rate matching is performed without considering beam-switching delays, then scheduling efficiency improves, but transmission reliability deteriorates due to potential misdetections
Solution Approach 1:
The patent incorporates preliminary action by accounting for beam-switching delays in advance when determining the rate matching pattern. The UE considers the time required for beam switching between receiving PDCCH and PDSCH, and adjusts the rate matching configuration accordingly to ensure reliable reception without requiring additional scheduling overhead.
Data Source
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AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for performing rate matching when resources for a physical downlink shared channel (PDSCH) overlap with resources of a control resource set (CORESET) in which a physical downlink control channel (PDCCH) that scheduled the PDSCH. As used herein, rate matching generally refers to the process of repeating or puncturing bits on a transport channel.