CSI Reporting Across DRX Groups for Lower UE Power Use
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Solution Overview
Problem
Existing communication systems face challenges in efficiently reporting channel state information (CSI) while optimizing power consumption and active times in discontinuous reception (DRX) configurations, particularly in Long Term Evolution (LTE) and New Radio (NR) systems.
Innovation Solution
The method involves configuring multiple DRX groups with CSI reporting resources and determining active times to report CSI only during the active periods of these groups, allowing independent CSI reporting across different frequency ranges, thereby reducing power consumption and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI reporting is performed continuously in DRX mode, then measurement precision is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic CSI reporting by triggering CSI measurement and reporting only during active DRX periods when the UE is awake and monitoring PDCCH. The MAC entity determines whether to trigger CSI reporting based on whether the active time condition is met, creating a periodic pattern aligned with DRX cycles rather than continuous reporting.
Solution Approach 2:
The patent introduces dynamic control of CSI reporting through the activeTimeCondition parameter and MAC Control Element (CE) mechanisms. The network can dynamically adjust whether CSI reporting occurs by setting different activeTimeCondition values (always, never, or based on PDCCH monitoring) and by sending MAC CE commands to trigger or cancel CSI reporting on specific cells.
2Adaptability or versatility
If multiple DRX groups are configured for different frequency ranges, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the DRX configuration into multiple independent DRX groups, where each group can be independently configured for different frequency ranges (e.g., FR1 and FR2). Each DRX group has its own active time conditions and CSI reporting configurations, allowing the UE to monitor different cells with different DRX parameters simultaneously.
Solution Approach 2:
The patent creates a universal DRX framework that can handle both single-frequency and multi-frequency scenarios through the drx-GroupID parameter. The same MAC entity and CSI reporting mechanisms work across multiple DRX groups, providing multi-functionality without requiring separate handling logic for different frequency ranges.
3Loss of energy
If CSI reporting is restricted to active time only, then power consumption is reduced, but loss of information may occur
Solution Approach 1:
The patent implements preliminary action by having the UE prepare and buffer CSI measurements during active DRX periods before entering sleep mode. The MAC entity triggers CSI reporting in advance during active time, and the network can schedule retransmissions or alternative reporting opportunities if the initial report is missed, ensuring CSI information is captured before power saving mode begins.
Data Source
AI summary
Disclosed are methods for a channel state information (CSI) reporting. An example method may include receiving a discontinuous reception (DRX) configuration information for configuring a plurality of DRX groups including a first DRX group with a first cell configured with CSI reporting resources, determining at least one DRX group in active time from the plurality of DRX groups, and reporting CSI over the CSI reporting resources on the first cell based on the DRX configuration information and the active time. Related apparatuses and computer readable media are also disclosed.