UE CSI Reporting During DRX Cycles
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Solution Overview
Problem
In wireless communication systems, especially during discontinuous reception (DRX) cycles, user equipment (UE) faces challenges in transmitting channel state information (CSI) reports efficiently, particularly when not scheduled for reception of downlink data, leading to delayed beam reconfiguration and increased power consumption.
Innovation Solution
The UE autonomously triggers and transmits CSI reports during DRX cycles, even in inactive times, allowing for timely beam reconfiguration and reduced power consumption by performing measurements and sending reports based on determined needs, rather than waiting for a scheduled wake-up signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for a scheduled wake-up signal to transmit CSI reports during DRX cycles, then power consumption is reduced, but beam reconfiguration is delayed
Solution Approach 1:
The patent implements dynamic DRX cycle configuration where the UE can operate with different DRX cycle lengths based on channel conditions. When beam reconfiguration is needed, the system switches to shorter DRX cycles or activates the UE earlier in the DRX cycle, allowing timely CSI report transmission while maintaining power savings during stable conditions.
Solution Approach 2:
The patent enables the UE to perform channel measurements and prepare CSI reports during DRX inactive periods before the scheduled wake-up time. This preliminary action allows the UE to have ready-to-transmit CSI reports when the wake-up signal arrives, reducing actual transmission delay without requiring continuous active monitoring.
2Loss of time
If the UE transmits CSI reports during DRX inactive time, then beam reconfiguration is timely, but power consumption increases
Solution Approach 1:
The patent implements autonomous UE behavior where the UE independently determines when CSI report transmission is necessary based on channel quality measurements. The UE performs measurements during DRX inactive time and autonomously decides to transmit CSI reports without waiting for network scheduling, enabling timely beam reconfiguration while minimizing unnecessary transmissions to conserve power.
Solution Approach 2:
The patent establishes a feedback mechanism where the UE monitors channel conditions during DRX cycles and provides CSI reports only when quality degradation is detected. This feedback-driven approach ensures beam reconfiguration occurs timely when needed while avoiding unnecessary transmissions during good channel conditions, optimizing the balance between response time and power consumption.
3Productivity
If the UE autonomously triggers CSI report transmission, then reporting efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements autonomous triggering based on parameter thresholds, where the UE monitors channel quality metrics (such as RSRP or SINR) and triggers CSI reports when parameters exceed predefined thresholds. This parameter-based approach simplifies the autonomous decision-making process compared to full channel analysis, improving reporting efficiency while keeping device complexity manageable through threshold-based logic.
Data Source
AI summary
Wireless communication devices, systems, and methods related to communicating CSI reports during a discontinuous reception (DRX) are provided. A method of wireless communication includes performing one or more measurements of one or more reference signals configured for a user equipment (UE). The method includes triggering transmission of a channel state information (CSI) report during a DRX cycle. The method includes transmitting to a base station (BS), the CSI report based on the triggering, the CSI report including the one or more measurements.