PS-PDCCH Monitoring During DRX to Cut UE Battery Drain
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing power consumption of user equipment (UE) due to continuous monitoring of physical downlink control channels (PDCCH), which leads to significant battery drain, especially in next-generation radio access technologies like NR.
Innovation Solution
Implementing a method for monitoring a power-saving (PS) physical downlink control channel (PDCCH) by informing power-saving information through a PS-PDCCH during discontinuous reception-on (DRX-on) duration, allowing PDCCH monitoring in specific search spaces other than a designated search space set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors PDCCH in every subframe to detect data, then the reliability of data reception is improved, but the power consumption increases significantly
Solution Approach 1:
The patent implements discontinuous reception (DRX) operation where the UE periodically wakes up during DRX-on duration to monitor PDCCH in specific search space sets, then enters sleep mode during DRX-off duration. This periodic monitoring pattern reduces power consumption compared to continuous monitoring while maintaining data reception reliability through scheduled wake-up periods.
Solution Approach 2:
The patent divides the monitoring of multiple search space sets into two categories: a first search space set monitored during DRX-off duration for wake-up indications, and second search space sets monitored during DRX-on duration for actual data scheduling. This segmentation allows the UE to minimize monitoring activity while maintaining reliable data reception.
2Adaptability or versatility
If the UE monitors multiple search space sets for PDCCH, then the capability to receive diverse data transmissions is improved, but the complexity of monitoring operations increases
Solution Approach 1:
The patent segments search space sets into different categories with different monitoring requirements. The first search space set is monitored continuously or more frequently for wake-up indications, while second search space sets are monitored only during DRX-on duration. This segmentation simplifies the overall monitoring complexity while maintaining the ability to receive diverse data transmissions.
Solution Approach 2:
The patent applies periodic monitoring patterns to different search space sets based on their importance and function. Critical wake-up indications in the first search space set are monitored with higher periodicity, while data scheduling in second search space sets uses lower periodicity during DRX-on duration, reducing overall complexity.
Data Source
AI summary
Provided are a monitoring method/device for monitoring a downlink control channel of a terminal in a wireless communication system, and a downlink control channel transmission method/device corresponding to the monitoring method/device. A PS-PDCCH including power saving information is monitored in a DRX-on period, and when the PS-PDCCH is detected, a PDCCH is monitored on the basis of same. The PS-PDCCH may provide notification about a specific search space set among a plurality of search space sets, and exceptionally skip PDCCH monitoring for the specific search space set.