PDCCH Search Space Group Switching for Terminal Energy Saving
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Solution Overview
Problem
Current communication systems have limited PDCCH monitoring effects when switching between search space groups, which hinders terminal energy saving.
Innovation Solution
Introduce search space group #2 that is not linked to any search space, allowing terminals to switch to it for PDCCH skipping, thereby reducing the need to monitor other search spaces and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a user equipment supports multiple bandwidth parts with different subcarrier spacings, then the adaptability to different service requirements is improved, but the complexity of determining search spaces increases
Solution Approach 1:
The patent segments the search space determination process by creating separate determination methods for first-type and second-type search spaces. First-type search spaces are determined based on first parameters while second-type search spaces are determined based on second parameters, dividing the complex unified determination problem into manageable segments that can be handled independently.
Solution Approach 2:
The patent applies local quality by configuring different search space parameters (such as monitoring occasions, offsets, and periodicities) for different bandwidth parts and search space types. Each search space can have locally optimized parameters tailored to specific service requirements, allowing customized configurations for control channels on different bandwidth parts without affecting the entire system.
2Measurement precision
If search space parameters are configured for each bandwidth part, then the precision of control channel monitoring is improved, but the signaling overhead increases
Solution Approach 1:
The patent implements universality by introducing a unified search space determination formula that can determine both first-type and second-type search spaces. The same determination mechanism (using parameters like monitoring occasions, offsets, and periodicities) serves multiple purposes across different bandwidth parts and search space types, reducing the need for separate configuration mechanisms.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting search space parameters (such as the offset value O_CSI-RS, monitoring periodicity, and bundling window size) based on the specific bandwidth part and search space type. These parameter variations allow precise control channel monitoring adaptation while maintaining a consistent determination framework, avoiding the need for completely separate configuration sets.
3Reliability
If multiple PDCCH monitoring occasions are configured, then the reliability of control channel reception is improved, but the processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple PDCCH monitoring occasions and determining their parameters in advance through the search space configuration. The monitoring occasions, their periodicities, and offsets are predetermined based on the search space parameters, allowing the user equipment to efficiently monitor control channels at predetermined intervals without real-time calculation delays.
Solution Approach 2:
The patent implements periodic action by configuring PDCCH monitoring to occur at regular intervals defined by the monitoring periodicity parameter. Multiple monitoring occasions are distributed periodically in time, allowing the system to balance reliability (through multiple monitoring attempts) with processing time (by spacing monitoring occasions at optimized intervals rather than continuously).
Data Source
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AI summary
Embodiments of this application disclose a search space group switching method and apparatus. The method can be applied to a terminal and includes switching between at least two search space groups, and performing corresponding physical downlink control channel PDCCH monitoring based on a switched-to search space group, where the at least two search space groups include search space group #2, search space group #2 being not linked to any search space or a first search space, the first search space including at least one of a first type common search space CSS, a UE specific search space USS, and a CSS other than the first type CSS.