Radio Communication Apparatus Transmission Power Control
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Solution Overview
Problem
Existing radio communication systems, such as cordless telephones, face interference issues when multiple systems operate in close proximity, and existing power control methods do not effectively manage transmission power to maintain communication while minimizing interference to other systems.
Innovation Solution
A radio communication apparatus using a TDMA system with a level measurement section to determine the minimum reception level and adjust transmission power accordingly, ensuring communication with multiple handsets while minimizing interference by transmitting control signals at the determined power level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base unit transmits a radio signal with maximum power to enable communication with distant handsets, then communication reliability is improved, but radio interference to other communication systems increases
Solution Approach 1:
The patent implements dynamic transmission power control where the base unit adjusts its transmission power based on the reception levels measured from handsets. Instead of using fixed maximum power, the system continuously adapts power levels to maintain communication reliability while minimizing interference to other systems.
Solution Approach 2:
The patent employs a feedback mechanism where the base unit measures the reception level of signals from handsets and uses this information to control subsequent transmission power. This closed-loop control ensures that power is adjusted according to actual communication needs, preventing excessive interference while maintaining reliable communication.
2Object-generated harmful factors
If the base unit reduces transmission power to minimize radio interference, then interference to other systems is reduced, but communication with distant handsets deteriorates
Solution Approach 1:
The patent applies different transmission power levels for different handsets based on their individual reception characteristics. The base unit measures reception levels from each handset and adjusts power specifically for each communication link, ensuring that each handset receives adequate signal strength without unnecessarily increasing overall interference.
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on measured reception levels. By adjusting this key parameter according to actual communication conditions, the system maintains reliable communication with distant handsets while minimizing interference when lower power suffices.
3Reliability
If the base unit uses high transmission power on the control channel to ensure reception at distant handsets, then synchronization and control signal transmission is improved, but interference to other cordless telephone systems increases
Solution Approach 1:
The patent implements dynamic power control specifically for control channel transmissions. The base unit measures reception levels of control signals at handsets and adjusts control channel power dynamically, ensuring reliable synchronization and control while minimizing interference to other systems during non-call periods.
Solution Approach 2:
The patent uses feedback from handset reception level measurements to control transmission power on the control channel. This ensures that control signals are transmitted with sufficient power for reliable synchronization and control, while avoiding excessive power that would cause interference to other cordless telephone systems.
Data Source
AI summary
A radio communication apparatus and transmission power control method are disclosed, which can maintain communication with handsets while avoiding an increase in radio interference to another radio communication system as much as possible when radio communication is performed with one or more handsets. The handset transmits a communication start request signal to a base unit. Upon verifying the reception of the communication start request, the base unit measures the RSSI level of the communication start request signal transmitted from the handset, determines a transmission power value based on a power control table that has been updated with the measured RSSI level, and controls the transmission power of a control signal transmitted to the handset.