PDCCH Monitoring Skipping for Multi-DRX 5G Cells
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Solution Overview
Problem
The challenge in 5G wireless communication systems is the inefficient handling of PDCCH monitoring, particularly when multiple discontinuous reception (DRX) groups are configured, leading to unnecessary power consumption and resource utilization.
Innovation Solution
A method and apparatus for skipping PDCCH monitoring based on downlink control information (DCI) indications, allowing user equipment (UE) and base stations to skip PDCCH monitoring for a duration on configured cells, thereby optimizing power consumption and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH monitoring is continuously performed on all configured cells, then control information reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where the UE alternates between active monitoring periods and sleep periods. During DRX on-duration, the UE monitors PDCCH on configured cells, then enters DRX sleep period where monitoring is suspended. This periodic action reduces power consumption while maintaining control information reception capability when needed.
Solution Approach 2:
The patent divides configured cells into different DRX groups (first DRX group and second DRX group) with independent monitoring configurations. The UE can selectively monitor PDCCH on specific cell groups during active periods and suspend monitoring on other groups during sleep periods. This segmentation allows fine-grained control over power consumption while maintaining reliability for critical control information.
2Productivity
If PDCCH monitoring is performed on all configured cells, then scheduling opportunities are improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies different monitoring characteristics to different cell groups within the same UE configuration. The first DRX group may have shorter cycles or different offset values compared to the second DRX group, allowing the network to optimize scheduling opportunities for different cell groups based on their specific traffic patterns and service requirements while avoiding uniform monitoring across all cells.
3Adaptability or versatility
If multiple DRX groups are configured with different parameters, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments DRX configurations into multiple independent DRX groups, each with its own set of parameters (drx-OnDurationTimer, drx-InactivityTimer, drx-SlotOffset, etc.). The UE maintains separate timing and monitoring state for each DRX group, allowing independent configuration and management of each group without increasing overall processing complexity significantly.
Solution Approach 2:
The network configures multiple DRX groups in advance through RRC signaling before UE operation begins. The UE receives and stores the complete set of DRX parameters for each group, preparing the configuration data structure ahead of time. This preliminary configuration reduces real-time processing complexity during actual DRX operation, as the UE simply follows pre-established timing and monitoring rules for each group.
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes identifying that one or more cells are configured; receiving, on a serving cell among the one or more cells, downlink control information (DCI) including information that indicates skipping PDCCH monitoring; and skipping the PDCCH monitoring for a duration on the serving cell based on the DCI.