DRX Cycle Alignment for CQI and SRS Transmission in LTE
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Solution Overview
Problem
Current discontinuous reception (DRX) technologies in wireless communications face challenges in efficiently managing channel quality indicator (CQI) and sounding reference symbol (SRS) transmissions, as well as voice over internet protocol (VoIP) silent periods, leading to suboptimal power management and resource allocation during sleep cycles.
Innovation Solution
The proposed solution involves aligning CQI, SRS, and VoIP silent period transmissions with the DRX cycle timers, specifically the DRX on duration or active time periods, to ensure efficient resource allocation and minimize unnecessary wake-ups, using a wireless transmit/receive unit (WTRU) that configures DRX cycles and timers to align these transmissions with either short or long DRX cycles based on configured thresholds and timer conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE stops monitoring PDCCH during sleep periods to save power, then power consumption is reduced, but CQI and SRS transmissions may occur during inactive periods causing resource allocation inefficiency
Solution Approach 1:
The patent implements dynamic DRX cycle selection where the UE can switch between short DRX cycles and long DRX cycles based on traffic conditions and network configuration. This dynamic adjustment allows the system to optimize between power savings and resource allocation efficiency - using short cycles when activity is high to maintain responsiveness, and long cycles when activity is low to maximize power savings while still coordinating CQI/SRS transmissions appropriately
Solution Approach 2:
The patent changes the DRX cycle parameter (duration) based on operational conditions. By configuring different DRX cycle lengths (short vs. long) and adjusting when CQI/SRS transmissions occur relative to DRX active periods, the system adapts its timing parameters to balance power consumption against resource allocation efficiency for uplink transmissions
2Productivity
If the UE uses short DRX cycles for more frequent monitoring, then resource allocation responsiveness is improved, but power consumption increases compared to long DRX cycles
Solution Approach 1:
The system dynamically selects between short and long DRX cycles based on traffic conditions, network configuration, and current operational state. This allows the UE to use short DRX cycles (higher power consumption, better responsiveness) only when necessary, and switch to long DRX cycles (lower power consumption, reduced responsiveness) during periods of low activity, thereby optimizing the trade-off between these two parameters
3Adaptability or versatility
If CQI and SRS transmissions are not aligned with DRX active periods, then transmission timing flexibility is maintained, but sleep duration is reduced and power savings are diminished
Solution Approach 1:
The patent establishes predetermined rules and configurations for aligning CQI and SRS transmissions with DRX active periods. By pre-configuring transmission timing to occur only during DRX on-duration or active periods, the system eliminates the need for dynamic timing adjustments while ensuring power savings are maximized - the alignment is built into the operation from the start rather than being adjusted in real-time
Data Source
AI summary
A method and apparatus for discontinuous reception (DRX) operation in a wireless transmit receive unit aligns uplink and downlink transmissions with a DRX cycle. The transmission may be a channel quality indicator report, a sounding reference signal, or a silence descriptor among other downlink and uplink transmissions.