DRX Power Reduction via Active Set Cell Segmentation
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Solution Overview
Problem
In wireless communication systems, mobile UE devices operating in discontinuous reception and transmission (DRX/DTX) mode face increased power consumption due to prolonged RF ON time during SFN decode cycles, which affects battery life and system efficiency.
Innovation Solution
The mobile UE device monitors signal quality of neighboring cells to qualify active cells, reduces the number of cells for SFN decoding, and processes snapshot information during off-periods to minimize RF ON time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile UE device monitors all neighboring cells continuously during DRX/DTX mode, then the cell selection and handover reliability is improved, but the RF ON time and power consumption increase
Solution Approach 1:
The patent segments the set of neighboring cells into two categories: active set cells (current serving cell and recently used cells) and other neighboring cells. The device monitors signal quality of all cells but only decodes SFN information for cells in the active set, dividing the monitoring task to reduce processing load while maintaining reliability for critical cells.
Solution Approach 2:
The patent applies partial action by decoding SFN information only for a subset of cells (active set) rather than all neighboring cells. This partial decoding approach reduces the number of cells requiring full processing during DRX/DTX mode, thereby reducing RF ON time and power consumption while maintaining sufficient cell selection reliability.
2Measurement precision
If the mobile UE device decodes SFN information for all neighboring cells during DRX/DTX mode, then the handover accuracy is improved, but the RF ON time increases leading to higher power consumption
Solution Approach 1:
The patent segments the SFN decoding process by identifying which cells require full SFN decoding (active set cells) versus which cells can be handled with simpler processing. This segmentation allows the device to maintain handover accuracy for critical cells while reducing RF ON time for less critical cells.
Solution Approach 2:
The patent performs preliminary actions by monitoring signal quality of all neighboring cells during DRX/DTX mode and pre-identifying the active set before handover events occur. This preliminary identification allows the device to prepare cell information in advance, reducing the need for extended RF ON time during actual handover decisions.
3Productivity
If the mobile UE device extends RF ON time to monitor more cells during DRX/DTX mode, then the system capacity and cell monitoring capability are improved, but the battery life decreases
Solution Approach 1:
The patent applies partial action by limiting SFN decoding to only the active set of cells rather than all neighboring cells. This selective approach maintains sufficient system capacity for handover and cell selection while significantly reducing the total RF ON time, thereby extending battery life during DRX/DTX mode operation.
Solution Approach 2:
The patent changes the parameter of cell selection criteria by using signal quality thresholds and historical usage patterns to identify the active set. This parameter-based approach allows the device to dynamically adjust which cells receive full monitoring and decoding treatment, optimizing the balance between system capacity and power consumption.
Data Source
AI summary
Techniques, systems and apparatus are described for reducing battery power consumption during a discontinuous reception and transmission mode of operation of a communication device. When operating in the discontinuous reception and transmission mode, a communication device can process radio frequency signals received from base stations to identify a set of active base stations based on a quality of the received radio frequency signals. This can reduce the total number of base stations to decode the corresponding system frame number (SFN). Based on the decoded SFN, the communication device can select a base station to perform hand-off.