Wireless Terminal Power Control for Base Station Selection
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Solution Overview
Problem
In wireless communication systems, terminal apparatuses often face challenges in selecting the optimal base station for communication, leading to increased path loss, reduced throughput, and inefficient radio resource utilization due to poor uplink radio wave conditions, which result in delayed data transmission and decreased frequency utilization efficiency.
Innovation Solution
A communication apparatus that calculates and minimizes transmission power by considering power information from candidate base stations, selecting the one with the smallest transmission power requirement to ensure efficient wireless communication, thereby reducing power consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a terminal apparatus connects to a base station with wider service area (macrocell), then coverage is improved, but transmission power increases due to larger path loss
Solution Approach 1:
The patent implements dynamic base station selection where the terminal apparatus calculates transmission power requirements for multiple candidate base stations and dynamically selects the one with the smallest calculated transmission power. This dynamic approach allows the system to adapt to changing conditions and select the most energy-efficient base station while maintaining adequate coverage.
Solution Approach 2:
The patent changes the selection parameter from simple signal strength or coverage area to calculated transmission power requirements. By considering power information from multiple base stations and calculating the transmission power needed for each, the system optimizes the energy parameter while maintaining coverage through multi-candidate evaluation.
2Use of energy by moving object
If a terminal apparatus connects to a base station with narrower service area (femtocell), then transmission power decreases, but coverage is reduced
Solution Approach 1:
The system dynamically evaluates multiple candidate base stations including both macrocells and femtocells, calculating transmission power requirements for each. This allows the terminal to dynamically switch between different types of base stations based on current conditions, achieving low transmission power when near femtocells while maintaining coverage options through macrocells.
Solution Approach 2:
The patent segments the base station selection process into evaluating multiple independent candidates with different service area characteristics. By considering both macrocells (wide coverage) and femtocells (narrow coverage, low power) as separate candidates and selecting based on calculated transmission power, the system achieves both coverage and energy efficiency.
3Device complexity
If a terminal apparatus selects base station without considering transmission power calculation, then selection process is simplified, but radio resource utilization efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal apparatus receives power information from candidate base stations, calculates transmission power requirements based on this feedback, and uses the calculation results to make an optimal selection. This feedback loop ensures efficient radio resource utilization while maintaining reasonable selection process complexity.
Solution Approach 2:
The system performs preliminary calculations of transmission power requirements for all candidate base stations before making the final selection. By preparing this information in advance, the selection process becomes more efficient and ensures optimal radio resource utilization without excessive complexity during the actual connection decision.
4Reliability
If transmission power is increased to maintain communication quality, then communication reliability is improved, but power consumption increases and interference increases
Solution Approach 1:
The patent changes the optimization parameter from fixed transmission power to calculated minimum required transmission power for each candidate base station. By selecting the base station that requires the smallest transmission power while meeting communication quality requirements, the system maintains reliability while minimizing interference and power consumption.
Solution Approach 2:
The patent converts the potential harm of high transmission power (interference and power consumption) into a benefit by calculating and selecting the base station that requires the minimum necessary power. This approach uses the power information from multiple candidates to identify the optimal selection that minimizes harmful effects while maintaining communication quality.
Data Source
AI summary
A communication apparatus in a communication system including a plurality of communication apparatuses, the communication apparatus includes a controller configured to, in a wireless communication with another communication apparatus, considering with power information related to a power amount of a signal to be transmitted from the communication apparatus to candidate communication apparatuses that are candidates for performing the wireless communication, calculate a transmission power amount for the candidate communication apparatuses, and perform a control such that a candidate communication apparatus for which the calculated transmission power amount is the smallest becomes the other communication apparatus for performing the wireless communication, and a transmitter configured to transmit a signal to the other communication apparatus considering with the power information.