PDCCH Repetition Complexity Handling with UE PPU Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling the complexity of physical downlink control channel (PDCCH) repetition, particularly in managing the processing unit (PPU) limits for user equipment (UE) and network nodes, leading to suboptimal resource allocation and increased computational burden.
Innovation Solution
The implementation of a mechanism where user equipment (UE) and network nodes exchange indications of PPU limits, enabling configuration of linked pairs of search space sets for PDCCH candidates, allowing for optimized PDCCH repetition based on these limits, thereby reducing computational complexity and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetition is implemented without considering UE PPU limits, then reliability of control channel transmission is improved, but device complexity and processing overhead increase
Solution Approach 1:
The system dynamically adjusts search space set configurations based on reported PPU limits. The network node receives PPU limit indications from UEs and configures appropriate numbers of search space sets and PDCCH candidates accordingly, making the system adaptive to different UE capabilities rather than using fixed configurations
Solution Approach 2:
The invention changes key parameters including the number of search space sets, number of PDCCH candidates per set, and monitoring occasions based on the PPU limit parameter reported by the UE. This allows the system to scale the complexity of PDCCH repetition configurations to match UE processing capabilities
2Reliability
If PDCCH repetition is implemented without considering UE PPU limits, then redundancy and reliability are improved, but processing overhead increases
Solution Approach 1:
The system applies partial repetition by configuring only the number of search space sets and PDCCH candidates that are necessary and appropriate for each UE's PPU capability. Instead of always using maximum repetition for all UEs, the network node tailors the repetition level to match actual UE processing capacity, avoiding excessive processing overhead
3Adaptability or versatility
If search space sets are configured without PPU limit consideration, then adaptability is reduced, but device complexity management becomes simpler
Solution Approach 1:
The UE performs preliminary action by reporting its PPU limits to the network node before receiving search space set configurations. This advance information allows the network node to pre-calculate and configure appropriate parameters, eliminating the need for complex real-time adjustments and simplifying overall configuration management
Solution Approach 2:
The system implements feedback through the PPU limit reporting mechanism. The UE provides feedback about its processing capabilities, and the network node uses this feedback to adjust configurations. This closed-loop approach enables adaptive configuration while keeping complexity management systematic and manageable
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network node, an indication of a physical downlink control channel (PDCCH) processing unit (PPU) limit associated with the UE. The UE may receive configurations for a plurality of search space sets, wherein the plurality of search space sets includes one or more linked pairs of search space sets with linked PDCCH candidates for PDCCH repetition. The configurations of the one or more linked pairs of search space sets may be based at least in part on the PPU limit associated with the UE. Numerous other aspects are described.