Context-Triggered Sidelink Power Control for V2X
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Solution Overview
Problem
Current sidelink transmission power control methods do not accurately reflect the necessary power levels, especially in scenarios where the pathloss to the radio access network node does not represent the distance or speed of devices in relation to the transmission context, leading to inefficient power usage and interference.
Innovation Solution
Implementing context-triggered power control for sidelink transmissions, where the first UE adjusts its transmission power based on the specific context of the transmission, such as urgency, distance, and speed, using adaptive power ramping schemes to ensure effective message delivery while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pathloss-based power control is used for sidelink transmissions, then transmission power can be adjusted based on distance to radio access network node, but the power level does not accurately reflect the actual transmission context such as device distance or speed
Solution Approach 1:
The patent changes the parameter basis for power control from pathloss (which reflects distance to radio access network node) to context-based parameters (which reflect actual transmission scenario such as device distance and speed). This allows the transmission power to accurately represent the real transmission context by adjusting power levels according to specific scenario parameters rather than relying solely on pathloss calculations.
2Reliability
If maximum transmission power is used for sidelink, then message delivery reliability is improved, but interference to other transmissions increases
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on the specific transmission context. Instead of using fixed maximum power, the system adaptively changes power levels according to scenario requirements (such as device distance, speed, and urgency). This dynamic approach ensures sufficient power for reliable message delivery while minimizing unnecessary interference in scenarios where lower power would be adequate.
Solution Approach 2:
The patent applies different transmission power levels tailored to specific local transmission contexts. Rather than using a uniform maximum power level for all sidelink transmissions, the system adjusts power quality locally according to each transmission's specific requirements, such as distance between devices, relative speed, and urgency of the message, thereby achieving reliable delivery only where necessary.
3Reliability
If transmission power is increased to ensure message delivery in complex scenarios, then communication reliability improves, but frequency spectrum efficiency decreases
Solution Approach 1:
The patent changes the basis for power determination from conservative fixed levels to context-adaptive parameters. By using scenario-specific parameters (device distance, speed, urgency) to determine appropriate power levels, the system achieves reliable communication only when and where necessary, rather than consistently using high power that would waste spectrum resources in scenarios where lower power would suffice.
Data Source
AI summary
There is provided mechanisms for context-triggered power control of a sidelink between a first UE and a second UE. A method is performed by the first UE. The method comprises controlling transmission power of the sidelink depending on transmission context in which transmission on the sidelink is triggered.