Wireless Power Adjustment via Test Packet Retransmission
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Solution Overview
Problem
In wireless communication systems, determining the distance between transmitting and receiving terminals based on signal strength is unreliable due to signal refraction, reflection, or diffraction, leading to inefficient power usage and potential packet loss.
Innovation Solution
A power adjusting apparatus that transmits test packets at various powers and adjusts subsequent packet transmission power based on retransmission numbers or ACK messages to optimize power usage and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the transmitting terminal transmits packets by maximum power, then the transmission distance is extended, but the power is wasted when the distance between terminals is short
Solution Approach 1:
The transmitting terminal dynamically adjusts transmission power based on real-time channel conditions and distance measurements. Instead of using fixed maximum power, the system varies power levels adaptively - using lower power for short distances and higher power for long distances, thereby extending transmission distance while avoiding power waste
Solution Approach 2:
The system changes the transmission power parameter based on measured distance between terminals. By calculating distance using TOF (Time of Flight) or RSSI (Received Signal Strength Indicator) and mapping it to appropriate power levels, the terminal optimizes power usage while maintaining adequate transmission range
2Length of moving object
If the transmitting terminal transmits by maximum power, then the signal reaches farther, but the packet cannot be correctly received due to signal saturation or clipping
Solution Approach 1:
The system dynamically adjusts transmission power to match the actual channel conditions and distance. By using lower power for short distances, the signal remains within the linear reception range of the terminal, avoiding saturation and clipping while still achieving reliable packet reception
Solution Approach 2:
The system uses feedback mechanisms where the receiving terminal reports signal quality metrics (such as SNR - Signal to Noise Ratio) back to the transmitting terminal. Based on this feedback, the transmitting terminal adjusts its power level to maintain optimal signal strength without causing saturation
3Adaptability or versatility
If the distance is judged by signal strength, then the transmission power can be adjusted, but incorrect judgment occurs due to signal refraction, reflection, or diffraction
Solution Approach 1:
The patent introduces time of flight (TOF) measurement as an intermediary method to determine distance. Instead of directly using signal strength which is affected by refraction, reflection, and diffraction, the system measures the time it takes for a signal to travel between terminals, providing a more accurate distance measurement that is not influenced by signal propagation effects
Solution Approach 2:
The system performs preliminary distance measurement using TOF or RSSI before actual data transmission. This preliminary action allows the terminal to pre-determine the appropriate transmission power level, avoiding the need to rely on signal strength during actual transmission which may be affected by environmental factors
Data Source
AI summary
A power adjusting apparatus communicating with a remote terminal is provided. The apparatus includes: a transceiving unit transmitting a plurality of test packets by a plurality of powers; a processing unit coupled to the transceiving unit, and deciding a transmission power for transmitting a subsequent packet according to at least one retransmission number of transmitting the test packets.