Sidelink DRX Timing for Low-Power V2X Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing power consumption and resource allocation for vehicle-to-everything (V2X) communication, particularly in scenarios where terminals are outside base station coverage, and there is a need for efficient discontinuous reception (DRX) methods to minimize terminal power consumption.
Innovation Solution
The proposed solution involves configuring DRX operations based on sidelink control information (SCI) and timers to manage active and off durations, with timer values determined by resource information in SCI, and using system information blocks (SIB) or inter-terminal RRC signaling for DRX configuration in various communication modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discontinuous reception (DRX) is implemented to minimize terminal power consumption, then power consumption is reduced, but reception reliability may deteriorate due to missed transmissions during off-duration
Solution Approach 1:
The transmitting terminal performs preliminary actions by sending SCI (Sidelink Control Information) before the actual data transmission. This SCI contains timing information that allows the receiving terminal to prepare for the upcoming transmission during its active time, ensuring it is ready to receive the data even though it may be in off-duration for other transmissions. This preliminary signaling enables the receiving terminal to wake up in advance for critical transmissions.
Solution Approach 2:
The DRX mechanism dynamically adjusts the terminal's reception state between active and off-duration based on transmission needs. The receiving terminal transitions between these states to balance power consumption and reception requirements. When a transmission is detected during active time, the terminal can extend its active state or adjust timing to ensure reception, creating a dynamic adaptation to varying communication needs.
2Reliability
If DRX active time is extended to ensure reception of all transmissions, then reception reliability is improved, but power consumption increases
Solution Approach 1:
The DRX mechanism operates in a periodic manner with defined active times and off-durations. The receiving terminal wakes up periodically during active times to monitor for transmissions and then returns to sleep mode during off-durations. This periodic action allows the terminal to maintain reception reliability for scheduled transmissions while minimizing power consumption during non-transmission periods.
Solution Approach 2:
The receiving terminal autonomously manages its own DRX state transitions based on received SCI information and internal timers. When the terminal detects a transmission during active time, it automatically adjusts its state using the timing information from SCI, extending active time only when necessary without requiring continuous external control. This self-service approach optimizes the balance between power consumption and reception reliability.
3Reliability
If timer values for DRX are increased to extend active duration, then reception reliability is improved, but the time window for power saving is reduced
Solution Approach 1:
The DRX mechanism uses configurable timer parameters (such as drx-InactivityTimer, drx-RetransmissionTimer) that can be adjusted to change the active duration. By optimizing these parameter values, the system extends the active time window only when necessary to ensure reception reliability, while maintaining shorter active durations during normal operation to maximize power saving time windows.
Solution Approach 2:
The timer values and active duration are dynamically adjusted based on the specific transmission conditions and received SCI information. The receiving terminal transitions between different timer states and active duration configurations to adapt to varying communication needs, extending active time only when reception reliability is at risk while maintaining shorter durations otherwise to preserve power saving opportunities.
Data Source
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AI summary
The present disclosure relates to: a communication technique that merges IoT technology with a 5G communication system for supporting higher data transmission rates than 4G systems; and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and loT-related technology. In addition, the present invention relates to a method and device for a V2X-supporting vehicle terminal to perform discontinuous reception during a process of transmitting and receiving information using another vehicle terminal, a pedestrian mobile terminal, and sidelink.