Uplink Power Control Offset for Path Loss Compensation
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Solution Overview
Problem
Conventional uplink transmission power control schemes in mobile communication systems fail to effectively compensate for the difference between downlink and uplink path losses, leading to inadequate power control performance, especially in environments with different operation frequency bands or gains.
Innovation Solution
A method and apparatus for controlling uplink transmission power in mobile communication systems by determining an initial offset value based on the number of retransmissions of an initial ranging code, transmission power unit, and power correction values received from the Advanced Base Station, allowing for compensation of path loss differences and accurate uplink power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional uplink transmission power control scheme is used, then system capacity and service quality can be improved, but the scheme fails to compensate for the difference between downlink and uplink path losses, leading to ineffective power control
Solution Approach 1:
The patent performs preliminary actions by determining the initial offset value during the initial ranging process, which includes counting the number of retransmissions and calculating the path loss difference before actual uplink transmission begins. This preliminary calculation of offset value compensates for path loss differences in advance, making the power control more effective from the start of uplink communication.
Solution Approach 2:
The patent implements feedback mechanisms where the base station provides power correction values to the mobile station based on received signal quality, and the mobile station adjusts its transmission power accordingly. The initial offset value determined during ranging serves as a feedback-based compensation for path loss differences, enabling continuous refinement of power control effectiveness.
2Device complexity
If the conventional scheme assumes equal downlink and uplink path loss, then the control scheme is simple, but it leads to transmission failures and excess reception power when path losses are different
Solution Approach 1:
The patent performs preliminary calculations during the initial ranging process to determine the initial offset value, which compensates for path loss differences before actual uplink transmission begins. This preliminary action adds minimal complexity to the ranging phase but significantly improves transmission reliability without complicating the ongoing power control operations.
Solution Approach 2:
The patent changes the power control parameter by introducing an initial offset value that accounts for path loss differences. This parameter modification allows the system to maintain simple control logic while achieving reliable transmission by adjusting the power calculation baseline to reflect actual path loss conditions.
3Measurement precision
If the initial offset value is determined based on retransmission information, then path loss difference compensation is achieved, but the initial ranging process becomes more complex
Solution Approach 1:
The mobile station performs self-service by autonomously determining the initial offset value using its own measurements of the number of retransmissions and the transmission power units. The mobile station calculates the path loss difference compensation without requiring additional signaling or complex base station processing, thereby achieving precise path loss measurement while minimizing added complexity.
Data Source
AI summary
A method and apparatus for controlling uplink transmission power in a mobile communication system are provided. In the method, an Advanced Mobile Station (AMS) determines uplink transmission power based on a measured path loss, an uplink noise and interference level received from an Advanced Base Station (ABS), a target Signal-to-Noise and Interference Ratio (SINR), and an offset. An initial offset value is determined based on a number of retransmissions of an initial ranging code performed until an initial ranging process is completed, a transmission power unit used for retransmission of the initial ranging code, and a power correction value received from the ABS upon completion of the initial ranging process with the ABS.