Discontinuous Wireless Reception Timing for NR V2X Broadcast Sync
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Solution Overview
Problem
In NR V2X scenarios, UE transmissions are not synchronized with network control, leading to unsynchronized reception and transmission intervals, causing data missed by the UE and potential driving safety issues.
Innovation Solution
A method involving a first node that receives an information set indicating a time length and expiration value, starts a timer, updates it at intervals, and monitors target signaling in candidate slots, adjusting the start time and duration of reception windows to synchronize with periodic broadcast services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the UE uses preconfigured parameters to perform a running of a timer, then the UE can operate in RRC-Idle or RRC-Inactive state with power saving, but the time interval when the UE performs reception and the time interval when the transmitting UE transmits data may not be synchronized, causing the UE to be unable to receive data
Solution Approach 1:
The receiving UE sends feedback information to the transmitting UE indicating whether data was successfully received. This feedback mechanism allows the transmitting UE to adjust its transmission timing based on actual reception status, ensuring synchronization between transmission and reception intervals while maintaining DRX power-saving operation.
Solution Approach 2:
The transmitting UE autonomously adjusts its transmission timing based on the feedback received from the receiving UE. This self-adjustment mechanism enables the system to maintain synchronization without requiring network intervention, preserving the power-saving benefits of DRX while ensuring reliable data delivery.
2Reliability
If the UE continuously monitors for data transmission, then data reception reliability is improved, but power consumption increases, reducing standby time
Solution Approach 1:
The UE employs discontinuous reception with periodic monitoring intervals defined by DRX cycles. The UE monitors for data only during specific wake-up periods and remains in low-power state during other intervals, achieving a balance between power consumption and data reception reliability through periodic rather than continuous monitoring.
Solution Approach 2:
The UE performs preliminary synchronization by aligning its DRX wake-up periods with the expected transmission timing of the transmitting UE. This preliminary alignment ensures that the UE is awake and monitoring at the correct intervals to receive data without requiring continuous monitoring, thus maintaining reliability while saving power.
3Productivity
If the transmitting UE periodically transmits data packets at fixed intervals, then broadcast service efficiency is improved, but synchronization with receiving UE reception intervals becomes difficult when network control is unavailable
Solution Approach 1:
The transmitting UE dynamically adjusts its transmission timing based on feedback from the receiving UE. Instead of rigid fixed-interval transmissions, the system adapts transmission timing to maintain synchronization with the receiving UE's DRX wake-up periods, enhancing synchronization adaptability while preserving broadcast service efficiency.
Solution Approach 2:
The transmitting UE autonomously manages its transmission timing by processing feedback information from the receiving UE and adjusting its own transmission schedule accordingly. This self-service mechanism enables the system to maintain synchronization in autonomous modes without network control, improving adaptability while keeping broadcast operations efficient.
Data Source
AI summary
A method and device for discontinuous wireless communications. A first receiver receives a first information set, the first information set indicates a first expiration value; a first processor starts a first timer at a first time in a first time period; when the first timer is running, updates the first timer in each first time interval in the first time period and monitors a first-type target signaling in each first candidate slot in the first time period; when the first timer expires, stops the first timer; herein, the first time period is a time period in a first super time period; a position of the first time in the first time period is related to a position of the first time period in the first super time period. The present application can achieve the benefit of power saving and improve the success rate of receiving periodic services.