Link Margin Feedback for Wireless Transmit Power Control
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Solution Overview
Problem
Conventional wireless devices consume excessive power due to transmitting at maximum permissible levels without considering the link margin of receiving devices, leading to inefficient power management.
Innovation Solution
Wireless devices determine and communicate their link margins to each other, allowing the transmitting device to adjust its power consumption based on the receiving device's link margin, thereby reducing transmit power while ensuring signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices transmit at maximum permissible power level, then signal reception reliability is improved, but power consumption increases
Solution Approach 1:
The receiving wireless device feeds back link margin information to the transmitting device, enabling the transmitter to adjust its power level based on actual reception conditions. This feedback mechanism allows the system to operate at lower power levels while maintaining reliable communication, directly resolving the contradiction between signal reliability and power consumption.
Solution Approach 2:
The system dynamically changes the transmission power parameter based on the link margin value received from the receiving device. By adjusting the power level parameter according to actual channel conditions and reception requirements, the system achieves both reliable signal delivery and reduced power consumption.
2Use of energy by moving object
If transmitting device reduces transmit power, then power consumption is reduced, but signal reception quality may deteriorate
Solution Approach 1:
The receiving device provides feedback about its link margin and reception requirements to the transmitting device. This feedback enables the transmitter to reduce power consumption by transmitting at the minimum necessary power level that still ensures acceptable reception quality, thus resolving the contradiction between power savings and reception quality.
Solution Approach 2:
The transmission power is made dynamic rather than fixed at maximum or minimum levels. The system continuously adapts the power level based on real-time link margin information and reception requirements, allowing optimal balance between power consumption and signal quality.
3Use of energy by moving object
If wireless device increases transmission rate, then power consumption is reduced due to shorter transmission time, but maximum supportable transmission rate is limited
Solution Approach 1:
The system changes the transmission rate parameter based on channel conditions and link margin information. By selecting the optimal transmission rate that balances speed and power consumption according to actual reception capabilities, the system resolves the contradiction between transmission speed and energy efficiency.
Data Source
AI summary
Disclosed herein are techniques for power management in wireless networks. Based upon receipt of an indication of the link margin of a receiving wireless device, a transmitting wireless device may adjust its transmit power commensurate with the link margin. The indication of the link margin may be transmitted from the receiving wireless device to the transmitting wireless device periodically. Alternatively, the receiving wireless station may provide the indication of the link margin in response to information received from the transmitting wireless device. In this instance, the indication of the link margin may be included in a piggyback acknowledgement (ACK) frame conventionally used to acknowledge receipt of the information transmitted by the transmitting wireless station.