Macro and Micro DRX Scheduling for Low-Power Data Reception
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Solution Overview
Problem
Wireless devices in DRX mode consume significant power when periodically powering up to monitor for data reception, even when no data is present, reducing battery operation time.
Innovation Solution
Implementing macro and micro discontinuous reception (DRX) configurations that include dynamic indication of inactivity intervals and reception opportunities, allowing devices to enter sleep mode during inactive periods and power up only for data reception, using different receiver powers and bandwidths as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE periodically powers up the radio to monitor for data reception in DRX mode, then the UE can detect incoming data transmissions, but the radio consumes significant power even when no data is present
Solution Approach 1:
The patent implements a periodic monitoring scheme where the UE wakes up at scheduled intervals during the on-duration to check for data, then returns to sleep mode. This periodic action allows the UE to maintain data detection capability while minimizing power consumption by keeping the radio off during intervals between monitoring periods.
Solution Approach 2:
The patent dynamically adjusts the DRX parameters including on-duration length, drx-InactivityTimer value, and monitoring intervals based on traffic conditions and UE state. This dynamic adaptation allows the system to optimize the balance between power consumption and data detection reliability according to actual network conditions.
2Use of energy by moving object
If the UE enters sleep mode during inactivity intervals to conserve power, then power consumption is reduced, but the UE may miss data transmissions if not properly synchronized
Solution Approach 1:
The network provides feedback to the UE through downlink control information indicating scheduled transmission times and DRX configuration parameters. The UE uses this feedback to synchronize its wake-up periods with expected data transmissions, ensuring reliable data reception while maintaining power savings during sleep intervals.
Solution Approach 2:
The network预先 notifies the UE of upcoming data transmissions through scheduling assignments received during the on-duration. This preliminary action allows the UE to know exactly when to wake up for data reception, eliminating the need for continuous monitoring while ensuring no data is missed.
3Reliability
If the UE monitors for data continuously to ensure no data is missed, then data reception reliability is maintained, but battery operation time is significantly reduced
Solution Approach 1:
Instead of continuous monitoring, the UE employs periodic monitoring at configured intervals during on-duration periods. This periodic approach maintains adequate data reception reliability for typical traffic patterns while extending battery operation time by keeping the radio powered off during intervals between monitoring periods.
Solution Approach 2:
The system changes key parameters including switching from continuous monitoring to periodic monitoring, adjusting the on-duration length, and modifying the DRX cycle length based on traffic conditions. These parameter changes enable the system to achieve an optimal balance between reliability and battery life.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless device may receive a downlink (DL) reception indication during an active duration of a discontinuous reception (DRX) configuration. The DL reception indication may indicate the presence of a reception opportunity following an inactivity interval, as well as the length of the inactivity interval. The wireless device may refrain from DL monitoring during the inactivity interval. In some cases, the wireless device may enter a sleep mode during the inactivity interval and wake up to receive a subsequent transmission during the reception opportunity. In some examples, the wireless device may use the inactivity interval to communicate using a different radio access technology (RAT).