V2X Transmit Power Control via Reference and Limit Values
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Solution Overview
Problem
The introduction of groupcast and unicast transmissions in NR V2X systems leads to mutual interference between radio signals in V2X links, necessitating a power control solution that balances desired signal reception with interference from other UEs.
Innovation Solution
A method involving the reception of a first information element indicating a reference power value and a second information set indicating a limit power value, with the transmitting power set to a value between these two, to adjust for interference and ensure effective communication across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmitting power is increased to ensure desired signal reception, then signal reception quality is improved, but interference to other UEs worsens
Solution Approach 1:
The patent changes the power control parameters by introducing a limit power value (P_max) that constrains the transmitting power. The transmitting power is determined as the minimum of the calculated power based on pathloss and the limit power value, thereby adjusting the power parameter to balance signal reception quality and interference to other UEs.
2Object-generated harmful factors
If power control is implemented to reduce interference, then interference to other UEs is reduced, but signal reception quality may deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the limit power value is configured by the network based on overall system conditions. The transmitting UE receives the limit power value configuration and applies it, while the network can adjust the limit power value based on feedback about interference levels and reception quality, creating a closed-loop control system that balances both objectives.
3Object-generated harmful factors
If limit power value is set low to reduce interference, then interference to other UEs is reduced, but transmitting power is constrained
Solution Approach 1:
The limit power value is not fixed but dynamically adjustable. The network can configure different limit power values for different UEs, different time periods, and different service types. This dynamic adjustment allows the system to optimize the balance between interference reduction and transmitting power according to real-time network conditions.
Data Source
AI summary
The present disclosure provides a method and a device in a node used for wireless communication. A first node receives a first information element, the first information element being used for indicating a first reference power value; and receives a second information set, the second information set comprising a second information element, the second information element being used for indicating a second limit power value; and transmits a first radio signal with a first power value; a target receiver of the first radio signal includes a transmitter of the first information element, the first power value is related to a smaller value between the first reference power value and the second limit power value. Taking into account restrictions resulted from interference when adjusting a transmitting power of a desired signal, the present disclosure can address interferences that may occur in V2X system in unicast or groupcast transmission.