PDCCH Candidate Monitoring Under Reserved Resource Collisions
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Solution Overview
Problem
Current wireless communication systems face challenges in managing collisions between enhanced Physical Downlink Control Channel (PDCCH) candidates and reserved resources, leading to inefficiencies and potential performance degradation in PDCCH transmission reliability and robustness, especially in scenarios involving multiple TRPs and non-ideal backhaul.
Innovation Solution
The proposed solution involves configuring linked search space sets for PDCCH transmission with multiple repetitions, and implementing enhanced candidate monitoring schemes to handle collisions with reserved resources, including fallback decoding behaviors, non-monitoring of collided candidates, and prioritized monitoring for urgent transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple repetitions of PDCCH are transmitted on multiple linked candidates to improve reliability, then PDCCH transmission reliability is improved, but the complexity of managing collisions with reserved resources increases
Solution Approach 1:
The patent segments the PDCCH transmission into multiple linked candidates across different search space sets, where each candidate can be independently monitored or skipped based on collision status. This segmentation allows the system to maintain multiple transmission paths while managing collision complexity on a per-candidate basis rather than treating all candidates as a single unit.
Solution Approach 2:
The patent introduces dynamic collision detection and adaptive monitoring mechanisms where the UE dynamically determines which linked candidates collide with reserved resources and adjusts monitoring behavior accordingly. The network equipment dynamically configures search space sets and linked candidate relationships, enabling flexible adaptation to resource availability while maintaining reliability through multiple transmission opportunities.
2Reliability
If all linked candidates are monitored to ensure reliable PDCCH reception, then reception reliability is improved, but the UE processing complexity and power consumption increase
Solution Approach 1:
The patent implements partial monitoring where the UE monitors only a subset of linked candidates based on collision detection results. When collisions with reserved resources are detected, the UE skips monitoring those specific candidates and relies on other non-colliding candidates in the linked set, performing less than full monitoring while maintaining adequate reception reliability.
Solution Approach 2:
The UE autonomously performs collision detection with reserved resources and self-determines which linked candidates to monitor or skip without requiring explicit network instructions for each candidate. This self-service mechanism reduces processing complexity by enabling the UE to independently manage its monitoring behavior based on detected collision conditions.
3Productivity
If PDCCH candidates are transmitted on reserved resources to maintain transmission schedule, then transmission productivity is maintained, but collision with reserved resources causes performance degradation
Solution Approach 1:
The patent implements preliminary collision detection before PDCCH transmission, where the network equipment identifies which linked candidates collide with reserved resources in advance. This preliminary action enables the network to adjust transmission strategies, configure alternative search space sets, or notify UEs about collision conditions before transmission occurs, preventing reliability degradation while maintaining schedule efficiency.
Solution Approach 2:
The system employs feedback mechanisms where collision information between PDCCH candidates and reserved resources is detected and communicated between network equipment and UEs. This feedback enables dynamic adjustment of search space configurations and linked candidate relationships, allowing the system to adapt to resource conflicts and maintain both productivity and reliability.
Data Source
AI summary
Methods and apparatus of enhanced Physical Downlink Control Channel (PDCCH) candidate monitoring are disclosed. The method includes: receiving, by a receiver, configurations of a plurality of search space sets that are linked for a Physical Downlink Control Channel (PDCCH) transmission with a plurality of repetitions; wherein the plurality of repetitions of the PDCCH are transmitted on a plurality of linked candidates; determining, by a processor, whether there is a collision between at least one of the linked candidates and a reserved resource; and providing, by the processor, a candidate monitoring scheme in response to a determination that a first candidate of the linked candidates collides with the reserved resource.