Vehicular Relay Node Adaptive Transmission Power Control
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Solution Overview
Problem
Current cellular communication systems face challenges in providing reliable mobile broadband data and voice services inside vehicles due to changing Radio Frequency (RF) conditions and penetration losses, leading to quality-of-service degradation.
Innovation Solution
A vehicular relay node with an adaptive power control scheme is used to improve cellular coverage by adjusting transmission power based on the quality of the radio link and vehicle state, minimizing interference with the macro layer and maintaining consistent coverage area despite varying distances and vehicle attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission power of the relay node is increased to improve coverage inside the vehicle, then the signal quality for mobile terminals is improved, but the interference to the macro layer network outside the vehicle increases
Solution Approach 1:
The patent implements dynamic power control where the relay node continuously adjusts its transmission power based on real-time measurements of the radio environment, including the strength of signals from serving and neighboring macro base stations. This allows the system to adapt power levels to changing conditions, maintaining adequate coverage while minimizing interference to the macro layer network.
Solution Approach 2:
The system employs feedback mechanisms where the relay node measures received signal strengths from macro base stations and uses this information to control its own transmission power. The controller receives feedback about the radio environment and adjusts power accordingly, creating a closed-loop control system that balances coverage and interference requirements.
2Object-generated harmful factors
If the transmission power is reduced to minimize interference outside the vehicle, then the interference to the macro layer is reduced, but the coverage area inside the vehicle decreases
Solution Approach 1:
The relay node dynamically adjusts its power level based on the current radio environment, including measurements of serving and neighboring cell signals. This allows the system to maintain coverage when needed while reducing power to minimize interference, adapting the coverage area size to actual requirements rather than using a fixed power level.
Solution Approach 2:
The system changes the transmission power parameter based on measured radio conditions, specifically the received signal strengths from macro base stations. By adjusting this key parameter dynamically, the system can optimize the balance between providing adequate coverage inside the vehicle and minimizing interference outside.
3Reliability
If the relay node uses high transmission power to compensate for vehicle body attenuation, then the signal quality inside the vehicle is maintained, but the power consumption and computational complexity increase
Solution Approach 1:
The system uses dynamic power control to avoid continuously operating at high power levels. Instead, it adjusts power based on actual coverage requirements and radio conditions, reducing power consumption when full power is not needed while maintaining signal quality when necessary.
Solution Approach 2:
The relay node adjusts its transmission power parameter based on measured received signal strengths from macro base stations and the current coverage requirements. This parameter adjustment allows the system to maintain adequate signal quality while minimizing unnecessary power consumption.
Data Source
AI summary
Embodiments provide an apparatus, a vehicle, a method, and a computer program for setting a transmission power. The apparatus (10) is operable to set a transmission power of a vehicular relay transceiver (100) in a mobile communication system (400). The relay transceiver (100) is operable in a vehicle (500) to relay information between a mobile transceiver (200) associated with the relay transceiver (100) and a base station transceiver (300) of the mobile communication system (400). The apparatus (10) comprises a transceiver module (12) which is operable to transmit a common signal using a transmission power. The transmission power influences a coverage area of the relay transceiver (100). The relay apparatus (10) further comprises a controller module (14) operable to determine information related to a quality of a radio link between the relay transceiver (100) and the base station transceiver (300) and information on a state of the vehicle (500). The controller module (14) is further operable to set the transmission power based on the information related to the quality of the radio link and based on the information on the state of the vehicle (500).