Adjusting CSI Report Transmission Timing for DRX Mode
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Solution Overview
Problem
In mobile communication systems, particularly in LTE and LTE-A, the efficient transmission and reception of CSI reports are hindered when User Equipment (UE) operates in Discontinuous Reception (DRX) mode, leading to system performance degradation due to incomplete CSI reporting, which affects CoMP-based communication services.
Innovation Solution
The method involves obtaining CSI report setting information and DRX setting information from the eNB, determining the UE's operation mode, and adjusting the transmission/reception times for CSI reports accordingly, ensuring reports are sent/received during active periods in DRX mode, thereby maintaining consistent CSI report transmission order and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UE operates in DRX mode to reduce power consumption, then power consumption is reduced, but CSI report transmission completeness deteriorates
Solution Approach 1:
The patent dynamically adjusts the CSI report transmission timing based on the UE's DRX active periods. The eNB configures multiple CSI report settings with different transmission timings, and the UE selectively transmits reports only during active periods when it is awake and able to communicate, thus maintaining reliability while benefiting from DRX power savings.
Solution Approach 2:
The patent changes the transmission timing parameter of CSI reports to align with DRX active periods. By configuring multiple CSI report settings with different time offsets and periodicities, the system ensures that at least some reports are transmitted during periods when the UE is active, resolving the conflict between power saving and transmission completeness.
2Reliability
If CSI report transmission timing is adjusted to align with DRX active periods, then CSI report completeness is improved, but transmission delay increases
Solution Approach 1:
The patent segments CSI reporting into multiple configurations with different priorities and timings. High-priority CSI reports are transmitted as soon as possible within active periods, while lower-priority reports are scheduled for subsequent active periods. This segmentation allows the system to minimize delay for critical reports while still achieving completeness across all reports.
Solution Approach 2:
The patent uses periodic CSI reporting configurations that align with DRX cycles. By setting report periodicities that match or divide the DRX active period frequency, the system ensures regular transmission opportunities without excessive delays, balancing completeness requirements with timely information delivery.
3Adaptability or versatility
If multiple CSI report settings are configured for different operation modes, then adaptability to DRX mode is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal CSI reporting framework that works for both DRX and non-DRX modes through a single configuration mechanism. The eNB configures multiple CSI report settings that can be selectively activated based on the UE's operation mode, allowing the same system to serve multiple purposes without requiring entirely separate configuration sets for each mode.
Solution Approach 2:
The UE autonomously determines which CSI report settings to apply based on its current operation mode (DRX or non-DRX). The device self-selects the appropriate transmission timing and periodicity from the configured options without requiring complex external control, reducing the overall system complexity while maintaining adaptability.
Data Source
AI summary
A method for sending a Channel State Information (CSI) report for a Downlink (DL) channel by a User Equipment (UE) in a mobile communication system is provided. The method includes obtaining, from an evolved Node B (eNB), CSI report setting information including information about a transmission cycle and a transmission time for a CSI report, and Discontinuous Reception (DRX) setting information including information about an active time period in which signal transmission/reception is available in a DRX mode, determining whether the UE operates in the DRX mode, and if the UE is determined to operate in the DRX mode, adjusting the transmission time taking into account the CSI report setting information and the active time period, and sending the CSI report at the adjusted transmission time.