Uplink Sounding Signal Power Control via CINR Estimation
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Solution Overview
Problem
Conventional broadband wireless communication systems lack effective power control for uplink sounding signals, leading to increased noise and interference due to a uniform target Carrier to Interference and Noise Ratio (CINR) value, which does not account for the status or channel conditions of Mobile Stations (MS).
Innovation Solution
The method involves estimating downlink CINR and noise interference levels to determine multiple target CINRs for uplink sounding signals, allowing for open loop and closed loop power control to optimize transmit power levels, thereby reducing overall system interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a uniform target CINR value is used for uplink sounding signals, then the power control is simple to implement, but noise and interference levels increase in the overall communication system
Solution Approach 1:
The patent applies local quality by determining different target CINR values based on the specific status and channel conditions of each Mobile Station (MS). Instead of using a uniform CINR value for all users, the system calculates individualized target CINR values considering factors such as MS location, channel conditions, and interference levels, thereby reducing overall noise and interference while maintaining implementation feasibility through automated calculations.
2Reliability
If higher uplink transmit power is used, then the received power at Base Station is sufficient, but interference to other terminals and adjacent cells increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the target CINR value as a control parameter based on MS status and channel conditions. The system calculates different target CINR values for different MSs, which then guides the power control process to achieve appropriate transmit power levels that ensure sufficient received power at the Base Station while minimizing interference to other terminals and adjacent cells.
3Object-generated harmful factors
If lower uplink transmit power is used, then interference to other terminals is reduced, but the received power at Base Station decreases
Solution Approach 1:
The patent applies feedback by incorporating MS status information and channel condition measurements into the target CINR determination process. The Base Station receives feedback about MS status and uses this information to calculate appropriate target CINR values, which then guide the power control to achieve a balance between sufficient received power and minimized interference to other terminals.
Data Source
AI summary
An apparatus and method for controlling a transmit power of a sounding signal in a wireless communication system are provided. The method includes estimating a downlink Carrier to Interference and Noise Ratio (CINR) using at least one signal received from a Base Station (BS), determining a transmit power level for a sounding signal using a target CINR for the sounding signal, wherein the target CINR is determined based on the downlink CINR and multi-target CINR information, and transmitting the sounding signal according to the transmit power level.