V2X Sidelink Power Control via Distance-Based Parameters
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Solution Overview
Problem
In V2X communication systems, calculating transmitting power based on pathloss between a transmitter and a receiver can lead to strong interference on sidelink communication between distant terminals, and existing methods to orthogonalize interfering transmissions may occupy excess resources or fail when the transmitter autonomously selects resources.
Innovation Solution
A method involving a communication node that receives information with power parameters to determine transmitting power values, using position information to adjust power settings, ensuring optimal power levels for V2X links to avoid interference while maintaining receiving performance and configuring different power parameters for varying transmission coverages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmitting power is calculated based on pathloss between transmitter and receiver in V2X pair, then receiving performance is improved, but interference on sidelink communication between other V2X pairs increases
Solution Approach 1:
The patent applies local quality by configuring different power parameters (P0, Palpha) for different distance zones. Terminals in different distance ranges relative to the target terminal receive different power parameter configurations, allowing power control to be locally optimized for each zone while considering interference to other V2X pairs. This resolves the contradiction by making power control adaptive to local spatial conditions rather than using a uniform pathloss-based approach.
2Object-generated harmful factors
If orthogonalize two pairs of mutually interfering sidelink transmissions in time-frequency resources, then interference is reduced, but resource occupation increases
Solution Approach 1:
The patent changes the parameter of transmitting power by configuring different power parameters for different distance zones. Instead of orthogonalizing transmissions in time-frequency resources, the invention adjusts the power level parameter to reduce interference. This allows simultaneous transmissions in the same resources while controlling interference through power management, thus avoiding the resource occupation penalty of orthogonalization.
3Object-generated harmful factors
If use position information to adjust power settings for different distance zones, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring power parameters (P0, Palpha) for different distance zones through higher layer signaling before transmission. The terminal does not need to perform complex real-time calculations, but rather selects the appropriate pre-configured parameters based on its distance to the target terminal. This reduces device complexity while still achieving interference reduction through position-based power control.
Data Source
AI summary
The present disclosure discloses a method and a device in a node for wireless communication. A first node receives first information, the first information being used for determining a first parameter set, the first parameter set comprising K1 power parameters; and the transmits a first radio signal; a transmitting power value of the first radio signal is a first transmitting power value, a first power parameter is one of the K1 power parameters, the first power parameter is used for determining the first transmitting power value; information of a position of the first radio signal relative to the first node is used for determining the first power parameter out of the K1 power parameters. The present disclosure manages to associate arrival expected power or pathloss compensation factors on the PC5 link in V2X system with the distance between two terminals in communication with each other in V2X network.