UE DRX Timer Aggregation for Connected Mode Power Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing User Equipment (UE) power consumption during discontinuous reception (DRX) in connected mode, particularly when there are sparse downlink or uplink transmissions, as existing methods either increase computational complexity or fail to detect DRX gaps at the earliest opportunity, leading to prolonged active monitoring and increased power consumption.
Innovation Solution
The implementation of a system and method for a UE to perform static DRX updates by aggregating DRX timers once per slot and monitoring DRX events only when all timers are set to expire, allowing for early detection of DRX gaps without significantly increasing computational complexity, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX timers are monitored continuously to detect DRX gaps, then power consumption is reduced, but computational complexity increases
Solution Approach 1:
The system performs preliminary aggregation of DRX timer expiry times at the beginning of each slot, determining in advance when all timers will expire. This preliminary action allows the UE to enter sleep mode confidently without needing to continuously monitor timer states, thereby reducing power consumption while avoiding excessive computational complexity through a streamlined aggregation process
Solution Approach 2:
The invention extracts only the essential information needed for DRX gap detection - the aggregation result of all timer expiry times - and discards unnecessary continuous monitoring of individual timer states. By taking out only the critical aggregation outcome, the system achieves accurate DRX gap detection with minimal computational overhead
2Device complexity
If DRX gap detection is delayed, then computational overhead is reduced, but active monitoring time increases leading to higher power consumption
Solution Approach 1:
The system performs the aggregation of DRX timer expiry times preliminarily at the start of each slot, rather than delaying detection. This early aggregation provides immediate knowledge of when all timers will expire, enabling the UE to detect DRX gaps at the earliest opportunity and minimize active monitoring time, thus reducing power consumption without significant computational overhead
Solution Approach 2:
The invention performs aggregation once per slot for each component carrier, which is a partial action compared to continuous monitoring of all timers individually. This partial aggregation approach provides sufficient information for accurate DRX gap detection while keeping computational overhead manageable, achieving the right balance between detection timing and processing load
3Measurement precision
If multiple DRX timers are monitored individually, then detection precision is improved, but device complexity increases
Solution Approach 1:
The system merges all individual DRX timer monitoring tasks into a single aggregation operation that computes the expiry time of all timers combined. This merging maintains detection precision by accurately determining when all timers expire (the maximum of individual expiry times), while dramatically reducing monitoring complexity from tracking multiple separate timers to tracking a single aggregated value
Solution Approach 2:
The aggregation mechanism serves multiple functions simultaneously: it tracks the expiry of all DRX timers, determines the precise DRX gap timing, and provides a simplified single-value output for decision-making. This multi-functionality maintains detection precision while reducing the complexity of individual timer monitoring through a universal aggregation approach
Data Source
AI summary
A user equipment (UE) configured for discontinuous reception (DRX) operation, is disclosed. The UE comprises one or more processors configured to perform a static DRX update by aggregating all DRX timers configured for the UE during each slot of one or more consecutive slots associated with a radio frame structure, until it is determined that all the DRX timers are expiring in a select slot of the one or more consecutive slots. The one or more processors is further configured to compute an end of DRX active time, upon performing the static DRX update in the select slot; and perform a dynamic DRX event aggregation responsive to determining that all DRX events associated with physical downlink control channel (PDCCH) monitoring occasions (MOs) within the computed end of DRX active time have not been received.