Dynamic DRX Cycle Switching for Wireless Device Power Optimization
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Solution Overview
Problem
Existing DRX configurations in wireless communication systems, such as 3GPP LTE, face challenges in balancing battery conservation with the need for always-on connectivity, especially when multiple applications are running concurrently, as they struggle to adapt DRX cycles to varying data transmission requirements, leading to inefficient CSI reporting and radio resource allocation.
Innovation Solution
A method and apparatus that dynamically switch between short and long DRX cycles based on the status of the drxInactivityTimer, ensuring continuous data transmission is maintained with the short DRX cycle, thereby optimizing CSI reporting frequency and radio resource allocation by preventing transitions to long DRX cycles during active data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE continuously monitors the downlink channel to maintain always-on connectivity, then the response speed and data transmission capability are improved, but the battery consumption increases significantly
Solution Approach 1:
The patent implements dynamic DRX cycle adjustment by switching between short and long DRX cycles based on data transmission status. When data transmission is detected, the system transitions to short DRX cycles for frequent monitoring; when idle, it switches to long DRX cycles for power saving. This dynamic adaptation resolves the contradiction between continuous monitoring (fast response) and power consumption.
Solution Approach 2:
The system changes the DRX cycle parameter (time interval between monitoring occasions) based on operational conditions. By adjusting this temporal parameter from short to long cycles, the system optimizes the balance between monitoring frequency (response speed) and energy consumption, directly addressing the technical contradiction.
2Device complexity
If a single DRX cycle is configured for all applications, then the configuration simplicity is improved, but the adaptability to different application requirements deteriorates
Solution Approach 1:
The patent segments the DRX operation into two distinct modes: short DRX cycle mode and long DRX cycle mode. Each mode is optimized for different scenarios (data transmission vs. idle). The system selectively activates appropriate segments based on application requirements, achieving both simplicity (two fixed modes) and adaptability (scenario-based selection).
Solution Approach 2:
The system dynamically selects between different DRX cycle configurations based on the active application and data transmission status. This dynamic selection mechanism allows a single DRX configuration structure to adapt to multiple application requirements, resolving the contradiction between configuration simplicity and application adaptability.
3Use of energy by moving object
If the UE transitions to long DRX cycle to save battery, then the battery consumption is reduced, but the data transmission responsiveness deteriorates
Solution Approach 1:
The patent implements dynamic switching between long and short DRX cycles based on data transmission status. When data transmission is detected (drxInactivityTimer running), the system transitions from long to short DRX cycles, ensuring rapid response while maintaining power efficiency during idle periods. This dynamic adaptation resolves the time-energy tradeoff.
Solution Approach 2:
The system uses the drxInactivityTimer as a feedback mechanism to monitor data transmission status. Based on this feedback, it automatically adjusts the DRX cycle length, switching to short cycles when transmission is active and long cycles when idle. This feedback-driven adaptation optimizes both power consumption and response time.
4Use of energy by moving object
If the DRX cycle is extended to reduce monitoring frequency, then the battery consumption is reduced, but the CSI reporting accuracy and radio resource allocation efficiency deteriorate
Solution Approach 1:
The patent dynamically adjusts DRX cycle length based on data transmission status. During active transmission, short DRX cycles ensure frequent CSI reporting for accurate channel state information and efficient radio resource allocation. During idle periods, long DRX cycles reduce power consumption. This dynamic adjustment resolves the contradiction between monitoring frequency and power consumption.
Solution Approach 2:
The system changes the DRX cycle parameter based on operational conditions. By adjusting this temporal parameter, the system ensures that CSI reporting frequency is high enough during data transmission to maintain accuracy and resource allocation efficiency, while reducing it during idle periods to save battery.
Data Source
AI summary
A method and apparatus for changing Discontinuous Reception (DRX) cycle in a wireless communication system is provided. A wireless device configures a short DRX cycle and a long DRX cycle. When a drx-ShortCycle timer expires, it is determined whether a drxInactivityTimer is run or not. Therefore, the wireless device uses one of the short DRX cycle and the long DRX cycle according to the determination. Discontinuous reception (DRX) cycle can be configured flexibly and a CSI report between the UE and the eNB can be complied with accurately.