UE CDRX Measurement Scheduling for Mobility and Power Balance
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Solution Overview
Problem
There is a trade-off between power consumption and throughput in wireless communications systems using Connected Mode Discontinuous Reception (CDRX), where prioritizing power savings can degrade throughput due to reduced mobility performance, and prioritizing mobility can increase power consumption.
Innovation Solution
A UE operates using CDRX with a No DRX minimum measurement period, determining whether there are measurement results to report to a base station, and sleeping based on a DRX cycle, adjusting sleep patterns based on status information from a modem to balance mobility performance and power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE sleeps during off-durations of CDRX cycle to reduce power consumption, then power consumption is reduced, but throughput degrades due to reduced mobility performance
Solution Approach 1:
The patent applies dynamics by making the UE's sleep/wake behavior adaptive rather than fixed. The UE dynamically adjusts its DRX operation based on real-time status information from the modem, including measurement report requirements and periodic reporting needs. This allows the system to transition between power-saving mode and mobility-active mode based on current conditions, resolving the contradiction between power consumption and throughput.
Solution Approach 2:
The patent changes operational parameters by adjusting the DRX cycle behavior based on status information. When measurement reports are required or periodic reporting is needed, the UE modifies its sleep schedule by waking up during off-durations. This parameter adjustment allows the system to maintain mobility performance when needed while maximizing power savings during periods when measurement reporting is not required.
2Productivity
If the UE prioritizes mobility performance by waking up during off-durations, then throughput is improved, but power consumption increases
Solution Approach 1:
The patent implements feedback by using status information from the modem to control UE behavior. The modem provides feedback about measurement report requirements, periodic reporting needs, and other status conditions. Based on this feedback, the UE intelligently decides whether to wake up during off-durations, ensuring mobility performance is maintained only when actually needed, thereby avoiding unnecessary power consumption.
Solution Approach 2:
The patent applies preliminary action by having the UE check status information before implementing full wake-up behavior during off-durations. The UE preliminarily assesses whether measurement reports are required or periodic reporting is needed, and only then decides to wake up. This preliminary check prevents unnecessary wake-ups and associated power consumption while ensuring mobility performance is maintained when required.
Data Source
AI summary
The devices, systems, methods, and techniques described herein provide for efficient operation of a user equipment (UE) configured to support mobility mechanisms while using connected mode discontinuous reception (CDRX). In some aspects, a UE configured to use CDRX may measure objects according to a No DRX minimum measurement period (e.g., a minimum measurement period configured when no DRX is used). Because the No DRX minimum measurement period may be shorter than a DRX minimum measurement period, the UE may be able to measure objects more frequently and improve mobility performance. Further, although the UE may perform measurements according to the No DRX minimum measurement period, the UE may still report the measurements according to a DRX minimum measurement period. Thus, the UE may report measurements less frequently, and the UE may sleep during more off-durations of a CDRX cycle, resulting in reduced power consumption.