5G Sidelink Power Control via Pathloss Measurement
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Solution Overview
Problem
In 5G communication systems, there is a need to effectively control transmission power and report power headroom for user equipment (UE) during sidelink or V2X communication to manage interference signals and determine optimal power usage.
Innovation Solution
A method involving a UE that determines pathloss between itself and other UEs or a base station to calculate transmission power, and then transmits signals based on this power, while also reporting power headroom to ensure efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve communication reliability, then interference to other users increases
Solution Approach 1:
The patent dynamically adjusts transmission power parameters based on real-time pathloss measurements and power headroom reports. The base station configures different power control parameters (P0, alpha) for different UEs and communication scenarios, allowing optimization of transmission power to maintain reliability while minimizing interference.
Solution Approach 2:
The patent implements a feedback mechanism where UEs report power headroom information to the base station, and the base station adjusts uplink power control parameters accordingly. This closed-loop feedback enables dynamic adaptation of transmission power to balance communication reliability and interference management.
2Measurement precision
If pathloss measurement is performed for both sidelink and uplink to improve power control accuracy, then measurement complexity increases
Solution Approach 1:
The patent segments the pathloss measurement process into distinct scenarios: sidelink pathloss measurement (for D2D communication) and uplink pathloss measurement (for UE-to-base station communication). Each measurement type has its own reference signals and calculation methods, allowing independent optimization and reducing overall complexity.
Solution Approach 2:
The patent introduces reference signals as intermediaries for pathloss measurement. The base station transmits downlink reference signals that UEs use to measure uplink pathloss, and similarly, sidelink reference signals enable pathloss measurement for device-to-device communication. These intermediaries simplify the measurement process by providing known transmission power levels.
3Use of energy by moving object
If power headroom reporting is implemented to improve power management, then signaling overhead increases
Solution Approach 1:
The patent implements periodic power headroom reporting where UEs report their power headroom information at regular intervals or triggered by specific events (e.g., when power headroom changes significantly). This periodic reporting mechanism balances the need for accurate power management with the constraint of minimizing signaling overhead.
Solution Approach 2:
The patent allows dynamic adjustment of power headroom reporting parameters, including reporting thresholds, periodicity, and trigger conditions. The base station can configure different reporting behaviors for different UEs based on their power management needs, optimizing the balance between power management accuracy and signaling overhead.
Data Source
AI summary
The present disclosure relates to: a communication technique combining a 5G communication system, for supporting a higher data transfer rate than 4G systems, with IoT technology; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. According to an embodiment of the present invention, a method of a terminal side link communication is characterized by further comprising: determining a first path attenuation between a second terminal and a first terminal; determining a second path attenuation between a base station and the first terminal; determining the transmission power of the first terminal based on at least one among the first pathloss and the second pathloss; and transmitting a signal based on the transmission power of the first terminal.