Uplink Reference Signal Transmission for Discontinuous Reception Timing
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Solution Overview
Problem
Maintaining uplink synchronization in wireless communication systems is challenging, leading to reduced throughput and battery life in user equipment (UE) due to the need for continuous reference signal transmission even when data is not available for transmission.
Innovation Solution
Implementing a method where the UE starts and continues uplink reference signal transmission only in anticipation of and during uplink data transmission, discontinuing it after data completion, to conserve battery power and optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous uplink reference signal transmission is performed to maintain timing synchronization, then uplink synchronization reliability is improved, but battery consumption increases and throughput decreases
Solution Approach 1:
The patent implements discontinuous transmission of uplink reference signals based on DRX cycles, where the UE transmits reference signals only during active periods and suspends transmission during sleep periods. This periodic action maintains timing synchronization reliability while significantly reducing battery consumption compared to continuous transmission.
Solution Approach 2:
The patent performs timing synchronization updates in advance during active periods before the UE enters sleep mode. By proactively refreshing the timing synchronization state while the receiver is active, the system ensures synchronization reliability is maintained without requiring continuous reference signal transmission, thus conserving battery power.
2Reliability
If continuous uplink reference signal transmission is performed to maintain timing synchronization, then uplink synchronization reliability is improved, but resource efficiency deteriorates
Solution Approach 1:
The patent employs periodic reference signal transmission aligned with DRX active periods, transmitting reference signals only when necessary for synchronization maintenance. This reduces unnecessary resource occupation and channel congestion, improving overall system throughput while maintaining adequate synchronization reliability.
Solution Approach 2:
The patent extracts and removes redundant reference signal transmissions that occur during UE sleep periods or when data transmission is not anticipated. By eliminating these unnecessary transmissions, the system improves resource efficiency and throughput while maintaining synchronization through strategically timed reference signal sends.
3Measurement precision
If uplink reference signal transmission is performed in anticipation of data transmission, then timing synchronization accuracy is improved, but resource wastage increases
Solution Approach 1:
The patent transmits uplink reference signals in anticipation of upcoming data transmissions during DRX active periods, ensuring timing synchronization is refreshed before data needs to be sent. This preliminary action improves timing accuracy for subsequent data transmissions while limiting resource usage to only those periods when data transmission is expected, avoiding wastage during sleep periods.
Data Source
AI summary
Systems and methods for controlling sounding reference signal transmission are provided; a user equipment starts transmitting the sounding reference signal in anticipation of uplink data transmission, and then discontinues transmitting the sounding reference signal after completion of uplink data transmission.