Uplink TPC Feedback Generation for Terminal Speed Adaptation
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Solution Overview
Problem
In OFDMA-based wideband mobile communication systems, uplink closed loop Transmit Power Control (TPC) using only Signal-to-Interference Noise Ratio (SINR) leads to unnecessary power control due to its inability to account for terminal movement, resulting in inefficient power management.
Innovation Solution
A feedback generation system that measures terminal movement speed and adjusts SINR values to determine a unit for TPC adjustment, regenerating feedback information to prevent unnecessary power control by setting appropriate transmission power adjustment values and calculating adjusted SINR values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If TPC feedback information is generated using only SINR, then the power control responds quickly to channel state changes, but it causes unnecessary power control when terminal moves to a domain ensuring another channel state
Solution Approach 1:
The system performs preliminary action by measuring terminal movement speed and predicting future channel state before actual channel degradation occurs. When terminal movement exceeds a threshold, the system proactively adjusts TPC feedback to prevent unnecessary power control actions, thereby reducing energy waste while maintaining quick response to genuine channel changes.
2Device complexity
If TPC adjustment unit is fixed, then the feedback generation is simple, but it cannot adapt to different terminal movement conditions
Solution Approach 1:
The TPC adjustment unit is made dynamic by linking it to terminal movement speed measurements. The system continuously monitors terminal velocity and adjusts the TPC feedback generation parameters accordingly. When terminal moves slowly, a finer adjustment unit is used for precision; when terminal moves quickly, a coarser adjustment unit prevents unnecessary adjustments, thus adapting to different movement conditions without excessive complexity.
Data Source
AI summary
A feedback generation method for uplink Transmit Power Control (TPC) in a mobile communication system is provided. A feedback generation system for uplink TPC includes an uplink information receiver to receive uplink information from a terminal, to measure a Signal-to-Interference Noise Ratio (SINR) value with respect to the received uplink information, and to measure a movement speed of the terminal, a transmission power adjustment value setting unit to set a transmission power adjustment value based on the movement speed of the terminal; an adjusted SINR calculator to calculate an adjusted SINR value, based on an expected SINR value and the measured SINR value; and a feedback information regenerator to regenerate feedback information based on the transmission power adjustment value and the adjusted SINR value, and to transmit the regenerated feedback information to the terminal.