Sidelink DRX Pattern for UE Power Saving in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in power saving for device-to-device communication, particularly in sidelink communication, where pedestrian or vulnerable UEs require efficient power management to maintain connectivity without excessive resource usage.
Innovation Solution
The implementation of a sidelink resource pool with a Discontinuous Reception (DRX) pattern allows UEs to selectively monitor and transmit within specific time slots, optimizing power usage by configuring periodic monitoring and transmission cycles based on traffic load and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring is performed in sidelink communication, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements Discontinuous Reception (DRX) mechanism where the UE periodically wakes up to monitor control information in specific slots according to a configured DRX pattern, then enters sleep mode during other slots. This periodic monitoring action maintains communication reliability through regular updates while significantly reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent dynamically adjusts the DRX configuration based on traffic conditions and communication requirements. The network can modify DRX parameters such as cycle length, on-duration, and sleep duration to balance between reliability and power saving, making the monitoring behavior adaptive rather than static.
2Productivity
If frequent resource monitoring is performed, then communication effectiveness is improved, but battery life decreases
Solution Approach 1:
The DRX pattern establishes periodic wake-up cycles where the UE monitors resources only during designated active slots rather than continuously. This periodic action maintains communication effectiveness through regular resource allocation updates while extending battery life by eliminating unnecessary monitoring during inactive periods.
Solution Approach 2:
The UE autonomously manages its power consumption by following the configured DRX pattern, waking up only when needed to check for available resources and going into power-saving mode otherwise. The system self-regulates the balance between monitoring frequency and power consumption without requiring constant external intervention.
3Use of energy by moving object
If DRX pattern is configured with longer sleep duration, then power saving is improved, but response time increases
Solution Approach 1:
The patent implements dynamic DRX configuration where the network can adjust the sleep duration and wake-up intervals based on current traffic conditions and latency requirements. When low latency is needed, the network can shorten the sleep duration or trigger immediate wake-up, while allowing longer sleep durations when time is not critical, thus optimizing the trade-off between power saving and response time.
Solution Approach 2:
The network performs preliminary configuration of DRX parameters and maintains awareness of active UEs before power-saving mode is fully engaged. This allows the system to quickly transition from sleep mode to active monitoring when needed, reducing the actual response time penalty despite longer sleep durations during normal operation.
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a second User Equipment (UE) for performing sidelink communication. In one embodiment, the method includes the second UE being (pre-)configured with a sidelink resource pool in a carrier or cell, wherein a DRX (Discontinuous Reception) pattern is associated to the sidelink resource pool. The method also includes the second UE selecting a resource in the sidelink resource pool based on the DRX pattern, wherein a specific message becomes available for transmission in the second UE. The method further includes the second UE transmitting the specific message on the resource to a plurality of UEs comprising at least a first UE.