Dynamic DRX Configuration for Wireless UE Power and Delay Trade-offs
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Solution Overview
Problem
Current wireless communication systems face challenges in selecting an optimal Discontinuous Reception (DRX) configuration for User Equipment (UE), leading to inefficient power management and delayed packet reception due to fixed sleep periods, which can deplete battery life or result in unacceptable delays.
Innovation Solution
A method and system that characterize packet delay as a function of DRX cycle duration and inter-arrival time, determining the optimal on-duration to meet delay constraints by evaluating and computing active time, allowing for dynamic adjustment of DRX configuration based on packet arrival processes, whether known or unknown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed sleep period is set in DRX mode, then power consumption is reduced, but packet reception delay increases
Solution Approach 1:
The patent implements dynamic DRX configuration where the sleep period and on-duration are adjusted based on packet arrival characteristics. The system transitions from fixed DRX parameters to dynamic adaptation by monitoring packet inter-arrival times and adjusting the DRX cycle accordingly, allowing the UE to optimize between power saving and delay performance based on actual traffic conditions
Solution Approach 2:
The patent changes the parameters of DRX configuration (sleep period, on-duration, cycle length) based on observed packet arrival patterns. By analyzing inter-arrival times and adjusting these parameters dynamically, the system optimizes the balance between power consumption and packet reception delay, rather than using static predetermined values
2Reliability
If the on-duration is increased to reduce delay, then packet reception reliability improves, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the on-duration parameter based on packet arrival characteristics. By monitoring traffic patterns and inter-arrival times, the UE adapts the active monitoring period to match actual packet arrival rates, ensuring reliable reception when packets are expected while minimizing power consumption during low-activity periods
Solution Approach 2:
The UE autonomously determines the optimal on-duration by analyzing its own packet arrival patterns and traffic characteristics. The system self-adjusts the DRX parameters without requiring external network configuration, using its observed traffic behavior to optimize the balance between reception reliability and power consumption
3Loss of energy
If the sleep period is extended to save battery, then power savings increase, but delay constraints may be violated
Solution Approach 1:
The patent adjusts the sleep period parameter dynamically based on observed packet inter-arrival times. By analyzing traffic patterns and modifying the DRX cycle length accordingly, the system ensures that sleep periods are extended only when traffic patterns indicate low activity, thereby maintaining battery savings while respecting application-specific delay constraints
Solution Approach 2:
The system uses feedback from observed packet arrival patterns to adjust DRX parameters. By monitoring actual packet inter-arrival times and using this information to refine DRX configuration, the system learns from past behavior and adapts sleep periods to maintain both power efficiency and delay compliance
Data Source
AI summary
A method and system for selecting an optimal DRX configuration for a User Equipment (UE) in a communication network is provided. An expression for expected maximum delay experienced by a packet arriving during the off-duration is derived for any packet arrival process (either known arrival process or unknown arrival process). Further, the method for computing the active duration in any DRX cycle with the expected delay to be less than a given threshold by considering all the timers in the communication network is provided. The DRX cycle configuration with minimum active duration is selected as optimal DRX configuration by the UE and UE informs the optimal DRX configuration to the network.