Priority-Dependent Sidelink Sync Signal Transmission
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Solution Overview
Problem
Current 3GPP New Radio (NR) sidelink synchronization mechanisms do not adequately consider priority when deciding whether a UE should transmit sidelink synchronization signals, leading to potential poorer synchronization coverage in out-of-coverage scenarios, as UEs with higher synchronization priority may not transmit signals due to RSRP measurement thresholds, resulting in lower quality synchronization sources being used.
Innovation Solution
The proposed solution involves configuring an offset or multiplier based on the synchronization priority of UEs, adjusting the synchronization transmission threshold and signal powers, to ensure that UEs with higher priorities are more likely to transmit sidelink synchronization signals, thereby enhancing synchronization coverage and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs transmit sidelink synchronization signals based solely on RSRP measurement thresholds, then transmission decisions are simple and energy-efficient, but synchronization coverage and quality deteriorate because higher priority UEs may not transmit
Solution Approach 1:
The patent modifies the transmission decision parameters by introducing priority-based adjustments to the RSRP threshold. Instead of using a fixed threshold, the system dynamically adjusts the threshold based on UE priority levels, ensuring that higher priority UEs are more likely to transmit synchronization signals even when RSRP measurements are moderate. This parameter change resolves the contradiction by maintaining simple threshold-based decision logic while improving synchronization coverage through priority-aware threshold adjustment.
2Reliability
If UEs with higher synchronization priority always transmit signals, then synchronization quality improves, but energy consumption increases and interference with lower priority UEs worsens
Solution Approach 1:
The patent applies local quality by differentiating transmission behavior based on UE priority levels. Instead of uniform transmission rules for all UEs, the system implements priority-specific transmission thresholds and behaviors. Higher priority UEs use lower thresholds and are more aggressive in transmitting, while lower priority UEs use higher thresholds and transmit less frequently. This localized differentiation ensures that synchronization quality is optimized through higher priority UE participation without requiring all UEs to transmit continuously, thereby managing energy consumption.
3Area of stationary object
If the synchronization transmission threshold is lowered to enable more UEs to transmit, then synchronization coverage expands, but signal interference and poor quality transmissions increase
Solution Approach 1:
The patent uses parameter changes by introducing priority-based threshold adjustment rather than applying a uniform low threshold. The transmission threshold is dynamically modified based on the priority level of each UE, allowing higher priority UEs to transmit with lower thresholds while lower priority UEs maintain higher thresholds. This selective parameter adjustment expands coverage through higher priority UE participation while preventing widespread low-quality transmissions that would cause interference.
4Measurement precision
If RSRP measurements are performed for all neighboring UEs, then transmission decisions are accurate, but measurement time and processing overhead increase
Solution Approach 1:
The patent applies local quality by differentiating the measurement and decision process based on UE priority. Instead of treating all UEs equally in the measurement process, the system prioritizes measurements and decisions for higher priority UEs. This allows the system to make accurate transmission decisions for critical high-priority UEs without requiring exhaustive measurements of all neighboring UEs, thereby reducing overall measurement time and processing overhead while maintaining decision accuracy where it matters most.
Data Source
AI summary
An out of coverage (OoC) user equipment (UE), of a wireless communications system, includes memory storing computer-executable instructions; and a processor configured to execute the computer-executable instructions, wherein the computer-executable instructions include receiving, at the OoC UE, first sidelink (SL) synchronization signaling from each of one or more neighboring UEs from among a plurality of neighboring UEs; and determining, by the OoC UE, whether to transmit a second SL synchronization signaling, based on the received first SL synchronization signaling, wherein the determining includes, generating at least one adjusted transmission determination value by adjusting at least one of, a synchronization transmission threshold, or signal powers of the one or more neighboring UEs, and determining whether to transmit the second SL synchronization signaling based on the adjusted transmission determination value.


