SL DRX Pattern Configuration for NR V2X Half-Duplex Interference
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Solution Overview
Problem
In wireless communication systems, particularly in sidelink (SL) communication, the half-duplex problem arises when the on-durations of SL transmission and reception overlap, leading to inefficient resource utilization and potential interference between different SL services, which complicates the management of priority and congestion levels.
Innovation Solution
The proposed method involves determining the overlapping time duration of active times for different SL services and prioritizing transmissions based on priority values, allowing lower-priority services to be transmitted outside the overlapping period or during non-overlapping times, thereby avoiding interference and ensuring successful reception of high-priority services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL transmission and reception are performed simultaneously in overlapping active time periods, then resource utilization is improved, but half-duplex interference occurs between transmission and reception
Solution Approach 1:
The active time period is segmented into overlapping and non-overlapping portions. Transmission and reception operations are separated into different time segments, with high-priority services using non-overlapping portions to avoid half-duplex interference while maintaining overall resource utilization
Solution Approach 2:
The system dynamically adjusts transmission and reception timing based on priority levels. High-priority services are scheduled in non-overlapping active time periods to prevent interference, while lower-priority services can utilize overlapping periods, creating a flexible priority-based time division mechanism
2Reliability
If SL DRX on-durations are configured to avoid overlap, then half-duplex problem is solved, but resource utilization efficiency decreases
Solution Approach 1:
Different quality requirements are applied to different time periods. Non-overlapping active time periods are designated for high-priority services requiring reliable half-duplex operation, while overlapping periods are available for lower-priority services, creating localized quality differentiation in time domain
Solution Approach 2:
The system changes the timing parameters of SL DRX configurations based on service priority. High-priority services use non-overlapping time windows with adjusted on-duration timing, while lower-priority services can tolerate overlapping configurations, allowing parameter adaptation to meet different reliability requirements
3Adaptability or versatility
If multiple SL services with different priorities are transmitted in overlapping active time, then service coverage is improved, but interference between services increases
Solution Approach 1:
The time resource is segmented into priority-based transmission windows. High-priority services are assigned to non-overlapping active time periods free from half-duplex interference, while lower-priority services utilize overlapping periods, creating a hierarchical time division structure that supports multiple services with different interference tolerances
Solution Approach 2:
The overlapping time duration determination acts as an intermediary mechanism that coordinates between high-priority and low-priority services. By identifying and excluding overlapping periods from high-priority transmission scheduling, the system mediates resource allocation to prevent interference while maintaining multi-service coverage
Data Source
AI summary
A method of operating a first apparatus 100 in a wireless communication system is proposed. The method may comprise: determining a time duration in which a first active time and a second active time overlap; performing SL transmission or SL reception of a service related to a smaller priority value among a first priority value and a second priority value, within the overlapping time duration; and performing SL transmission or SL reception of a service related to a greater priority value among the first priority value and the second priority value, outside the overlapping time duration.