DRX Terminal CSI Reporting via Wake-Up Signals
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in effectively reporting channel state information (CSI) due to the use of discontinuous reception (DRX) and wake up signals (WUS), which can lead to power consumption issues and difficulties in tracking beam directions.
Innovation Solution
The proposed solution involves a method and apparatus for dynamically adjusting CSI reporting in a wireless communication system. This includes receiving configuration information related to DRX and WUS from a base station, identifying whether to wake up and monitor scheduling, and transmitting CSI based on these conditions. The terminal can selectively report CSI or perform periodic reporting even when the WUS is off, depending on configured thresholds and RRC settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discontinuous reception (DRX) is used to reduce power consumption, then power consumption is reduced, but channel state information (CSI) reporting accuracy deteriorates
Solution Approach 1:
The base station transmits a wake-up signal before the terminal needs to report CSI, allowing the terminal to wake up, transmit CSI, and then go back to sleep mode. This preliminary wake-up action ensures CSI reporting is maintained while preserving DRX power savings.
Solution Approach 2:
The base station monitors downlink data transmission status and uses this feedback to determine when to send wake-up signals. When no data is transmitted for a predetermined period, the base station sends wake-up signals to trigger CSI reporting, creating a feedback-driven mechanism that balances power saving with measurement accuracy.
2Measurement precision
If wake-up signals are transmitted frequently to maintain beam direction tracking, then beam direction tracking accuracy is improved, but power consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic wake-up signals transmitted at predetermined intervals or triggered by specific conditions (such as no data transmission for a set period). This periodic action maintains beam direction tracking while minimizing power consumption by keeping the terminal in sleep mode between wake-up events.
3Measurement precision
If CSI reporting is performed continuously to track channel states, then channel state tracking accuracy is improved, but power consumption increases
Solution Approach 1:
The CSI reporting mechanism is made dynamic rather than static. The terminal adjusts its operation mode between sleep and wake-up states based on real-time conditions, specifically whether the base station has data to transmit. This dynamic adjustment allows the system to maintain channel state tracking accuracy when needed while minimizing power consumption during idle periods.
Data Source
AI summary
The present disclosure relates to a method and apparatus for transmitting and receiving data in a wireless communication system. An operating method of a terminal in a wireless communication system may include receiving configuration information related to discontinuous reception (DRX) through radio resource control (RRC) signaling from a base station, wherein the configuration information related to the DRX includes information related to a cycle of the DRX and information related to a timer of a duration for monitoring a physical downlink control channel (PDCCH) within the cycle of the DRX, receiving configuration information about downlink control information (DCI) related to an indication of wake up in the DRX, through RRC signaling from the base station, identifying the wake up in the DRX based on the DCI, and when the wake up is not identified in the DRX, performing periodic channel state information (CSI) reporting, based on whether information indicating the periodic CSI reporting is included in the configuration information about the DCI.