DRX Timer Randomization for V2X Congestion Avoidance
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Solution Overview
Problem
In NR V2X scenarios, the lack of network control over DRX-related timers leads to complete synchronization of UE reception times, reducing Sidelink resource pool time resources and causing system congestion, which decreases transmission accuracy.
Innovation Solution
A method where a first node receives information indicating a user identity, determines the start time of a timer based on this identity, and monitors a radio signal in candidate slots, randomizing the start times of user DRX to avoid synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If all UEs adopt same pre-configuration parameters to determine DRX timer parameters, then UE power consumption is reduced and standby time is lengthened, but complete synchronization in time of reception is incurred, reducing Sidelink resource pool time resources and causing system congestion
Solution Approach 1:
The patent applies local quality by making DRX timer parameters UE-specific rather than uniform. Each UE is assigned unique timer parameters (different on-duration times, different reception start times) based on its identity, so that while all UEs benefit from DRX power savings, they do not synchronize their reception times, thereby avoiding resource pool congestion and improving overall radio resource utilization efficiency
2Device complexity
If all UEs adopt same pre-configuration parameters to determine DRX timer parameters, then DRX function is simplified, but complete synchronization in time of reception is incurred, decreasing transmission accuracy
Solution Approach 1:
The patent resolves this contradiction by introducing UE-specific timer parameters that are determined based on each UE's identity. This maintains relative simplicity in the DRX mechanism while preventing reception time synchronization among UEs, thereby avoiding collisions and improving transmission accuracy without requiring complex network control
3Adaptability or versatility
If network cannot perform parameter configuration and control on DRX-related timers, then out-of-coverage scenarios are supported, but complete synchronization in time of reception is incurred, reducing time resources of Sidelink resource pool
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously determine their own DRX timer parameters based on their identities without requiring network configuration. Each UE independently calculates its on-duration time and reception start time using pre-stored timer parameters and its own ID, allowing out-of-coverage operation while avoiding reception time synchronization and preserving Sidelink resource pool time resources
Data Source
AI summary
A method and device used for discontinuous reception(DRX) for wireless communications. A first node receives first information, the first information indicates a first identity (ID); determines a start time of a first timer according to the first ID; at the start time of the first timer, starts the first timer; when the first timer is running, monitors a first radio signal in each candidate slot; herein, the first ID belongs to a link-layer ID; the start time of the first timer is a start time of a first time interval. The start time of a first timer is determined according to a first ID, which can randomize start times of a user's DRX, avoiding possible system congestion and increasing transmission accuracy.