Wireless Power Control State Transition for Energy Efficiency
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Solution Overview
Problem
In wireless communication systems, the inefficiency in power control occurs when the threshold level remains stable, leading to a large number of alternating power increments and decrements, which can negatively impact performance and battery life, especially for access terminals.
Innovation Solution
A method where devices periodically compare signal power levels with a threshold, transmitting power-increment and power-decrement commands accordingly, and transition to a steady-power state after a sequence of alternating commands, ceasing adjustments unless the power level diverges significantly from the threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive power control continuously adjusts transmission power based on feedback, then received power requirements are met, but unnecessary power fluctuations occur when threshold is stable
Solution Approach 1:
The system dynamically transitions between two operational states: responsive mode for rapid power adjustments and steady mode for stable operation. This dynamic state switching allows the system to adapt its behavior based on whether the threshold is changing or stable, thereby reducing unnecessary power fluctuations while maintaining reliability.
Solution Approach 2:
The system uses feedback about threshold stability to control the power adjustment process. When the threshold remains stable for a predetermined period, the system recognizes this condition and switches to steady mode, preventing continuous alternating adjustments. This feedback mechanism enables the system to distinguish between transient and stable conditions.
2Reliability
If power control commands are continuously transmitted to maintain threshold levels, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The power control process is segmented into distinct operational modes (responsive mode and steady mode) with clear transition criteria. This segmentation simplifies the control logic by providing well-defined states and transition conditions, making the system easier to implement and manage while maintaining reliability.
Solution Approach 2:
The system employs periodic evaluation of threshold stability over a predetermined time period. This periodic assessment allows the system to determine when to switch between operational modes, providing a structured approach that reduces complexity while ensuring reliable communication.
3Reliability
If alternating power increment and decrement commands are transmitted, then power threshold is maintained, but transmission time increases
Solution Approach 1:
The system dynamically adjusts its response behavior based on the stability condition. During steady operation, the system suppresses alternating commands and maintains a fixed power level, significantly reducing the time spent transmitting unnecessary power control commands while still maintaining the power threshold.
Solution Approach 2:
The invention extracts and removes the unnecessary alternating power commands from the transmission sequence when the threshold is stable. By identifying and eliminating these redundant commands, the system reduces transmission time without compromising the maintenance of power threshold requirements.
Data Source
AI summary
A method and system is disclosed for intelligent power control in a wireless communication system. In accordance with an example embodiment, a first device will operate in a dynamic-power state in which it transmits a power-increment command or power-decrement command in response to each of periodic comparisons of a signal power level of a signal received from a second device with a threshold power level. While operating in the dynamic-power state, the first device will recognize when it has transmitted a threshold number of alternating power-increment and power-decrement commands, and responsively will transition to operating in a steady-power state in which it continues to transmit alternating power-increment and power-decrement commands even if it detects that the second device has ceased responding to the alternating power-increment and power-decrement commands. While operating in the steady-power state, the first device will recognize when the difference between a currently-received signal power level and the threshold power level is greater than a differential threshold power, and based at least on the recognition will transition to operating in the dynamic power state.