SIR Target Control for Multi-Data-Rate Power Adjustment
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Solution Overview
Problem
In multi-data-rate communication systems, conventional power control methods fail to maintain a sufficient signal-to-interference ratio (SIR) when data rates vary, leading to potential data errors and dropped calls, as the transmission power may be insufficient for higher data rates.
Innovation Solution
A communication device with a processor and transceiver that adjusts transmit power based on error rates and data rates, ensuring the power level never falls below a threshold to maintain a desired quality of service (QoS), by computing a new error value adjusted for the current data rate and stepping up or down power accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to maintain sufficient SIR for higher data rates, then data transmission quality is improved, but interference with nearby cell phones increases
Solution Approach 1:
The system performs preliminary action by adjusting the target SIR to a higher value before the data rate increase occurs. When silence period exceeds a threshold, the target SIR is proactively increased, so that when speech resumes and higher data rate is needed, the power level is already sufficient to support the higher data rate without causing SIR deficiency.
Solution Approach 2:
The system implements dynamics by making the target SIR adjustable and variable rather than fixed. The target SIR can be dynamically changed based on the current data rate and silence period detection, allowing the power control system to adapt to varying data rate requirements and optimize the balance between transmission quality and interference.
2Object-generated harmful factors
If transmission power is reduced to minimize interference, then interference with nearby cell phones is reduced, but SIR becomes insufficient for higher data rates
Solution Approach 1:
The system performs preliminary action by detecting silence periods and proactively adjusting the target SIR upward before the user speaks again. This ensures that when higher data rate is needed, the power level is already prepared to support it, preventing the need to later increase power which would cause interference.
Solution Approach 2:
The system makes the target SIR dynamic and adjustable based on detected silence periods and current data rate requirements. This allows the system to optimize power levels by raising target SIR in advance during silence periods when interference is not an issue, then maintaining appropriate power levels when transmission is active.
3Device complexity
If conventional power control is used with variable data rates, then system complexity is reduced, but SIR cannot be maintained when data rate varies
Solution Approach 1:
The system uses relatively simple silence period detection and target SIR adjustment logic that operates in advance. When a silence period exceeds a threshold, the target SIR is increased, which prepares the power control system for upcoming higher data rate requirements without complex real-time calculations during active transmission.
Solution Approach 2:
The system introduces dynamic target SIR adjustment based on detected silence periods and current data rate. This adds moderate complexity to the power control logic but maintains simplicity by using threshold-based detection and predefined adjustment rules rather than complex continuous optimization algorithms.
Data Source
AI summary
A communication device adjusts its power level based on a desired quality of service and based on a data rate being used to transmit data. The communication device may comprise a processor, a transceiver, and a power source that provides a power level to the transceiver for transmitting data at a variable rate. The processor obtains a first value indicative of a number of transmission errors, computes a second value using the first value and based on the data rate, and determines whether the second value is below a threshold. Based on a comparison of the second value to said threshold, the processor initiates a change in the power level. Additionally or alternatively, the processor may adjust the power level based on whether a current frame contains an error, but not permitting the power level to be decreased to a level at which a signal-to-interference ratio falls below a threshold.