Adaptive Pilot Power Control for Discontinuous Radio Transmission
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Solution Overview
Problem
In radio communication systems, especially in mobile communications like GSM and UMTS, the existing power control methods for pilot and data signals can be disrupted by discontinuous data transmission, leading to inefficient use of transmit power and increased interference.
Innovation Solution
A method and system where the pilot signal is transmitted continuously and its power level is temporarily increased during data transmission, based on the current transmission format, to ensure accurate channel estimation while minimizing average interference, and the power level is adjusted accordingly during data packet gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pilot signal is transmitted continuously during discontinuous data transmission, then channel estimation accuracy is maintained, but transmit power efficiency deteriorates and unnecessary interference is generated
Solution Approach 1:
The patent applies dynamics by making the pilot signal transmission adaptive rather than static. The system dynamically adjusts pilot signal transmission based on data transmission status - transmitting pilot signals during data transmission intervals and selectively omitting them during gaps. This dynamic approach allows the system to maintain channel estimation accuracy when needed while reducing unnecessary transmit power and interference during discontinuous periods.
Solution Approach 2:
The patent changes the transmission parameter of the pilot signal from continuous to discontinuous based on the data transmission format and timing. By modifying the pilot signal transmission parameters (on/off status, timing) according to the actual data transmission schedule, the system achieves both accurate channel estimation during active transmission and reduced power consumption during gaps, resolving the contradiction between measurement precision and energy loss.
2Measurement precision
If the pilot signal transmit power is increased during data transmission, then channel estimation accuracy is improved, but average interference increases
Solution Approach 1:
The patent applies periodic action by synchronizing pilot signal transmission with data transmission intervals. Instead of continuous transmission, the pilot signal is transmitted periodically during data transmission periods and omitted during gaps. This periodic approach ensures that channel estimation is available when data is transmitted while minimizing average interference by avoiding continuous high-power pilot transmission during idle periods.
Solution Approach 2:
The system dynamically adjusts pilot signal power levels based on the current transmission format and data transmission status. By making the pilot power adaptive rather than fixed, the system can increase power during data transmission to ensure accurate channel estimation while reducing power during gaps to minimize average interference, thus resolving the contradiction between measurement precision and harmful factors.
3Measurement precision
If the pilot signal is transmitted during data transmission gaps, then channel estimation is maintained, but transmit power consumption increases
Solution Approach 1:
The system employs self-service by having the receiving station perform channel estimation using pilot signals transmitted during data transmission intervals. The receiver utilizes the available pilot signals and its own processing capabilities to maintain channel estimation without requiring continuous pilot transmission during gaps. This self-service approach allows the system to maintain estimation continuity while avoiding the energy cost of continuous pilot transmission.
Data Source
AI summary
A radio communication system has a plurality of transmission formats available for transmitting data signals, and a pilot signal is transmitted during the transmission of data to enable channel estimation. The transmit power of the pilot signal is varied depending on the current transmission format of the data, and is reduced in the periods between data transmissions.