Fractional Power Control for Uplink Interference Management
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Solution Overview
Problem
Existing Single Carrier and Multi-Carrier FDMA communication systems face challenges in achieving a balance between cell-edge performance and overall spectral efficiency due to interference and power control issues, particularly at the edge of cell coverage areas.
Innovation Solution
Implementing a fractional power control scheme and minimum bandwidth allocation method, where uplink transmit power and bandwidth are adjusted based on channel conditions and path loss thresholds to optimize power usage and reduce interference, allowing users to transmit effectively while minimizing interference and enhancing spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If each UE transmits at full power on the uplink, then the received power at the radio access network is maximized, but the interference from other sectors/cells increases significantly, especially for UEs at the edge of a cell
Solution Approach 1:
The patent applies local quality by implementing fractional power control where different UEs transmit at different power levels based on their specific channel conditions and path loss characteristics. Edge UEs with high path loss transmit at higher fractional powers while near UEs with low path loss transmit at lower fractional powers, optimizing the balance between received power and interference for each local situation.
Solution Approach 2:
The patent changes the power transmission parameter from a fixed full-power mode to a dynamic fractional power mode. The fractional power control parameter is adjusted based on path loss thresholds and channel conditions, transforming the power transmission from a static parameter to a dynamically optimized parameter that adapts to varying propagation conditions.
2Object-generated harmful factors
If traditional power control scheme is implemented where each UE transmits at power resulting in same received power, then interference is reduced, but the overall spectral efficiency decreases due to lack of UEs that can transmit at high data rates
Solution Approach 1:
The patent implements local quality by allowing different UEs to operate at different received power levels based on their individual channel conditions. Instead of forcing uniform received power, edge UEs can transmit at higher powers to achieve acceptable received power levels, while near UEs operate at lower powers, enabling more UEs to achieve high data rates and improving overall spectral efficiency.
Solution Approach 2:
The patent introduces dynamics by making the power control parameter adaptive rather than static. The fractional power control parameter is dynamically adjusted based on path loss measurements and channel conditions, allowing the system to adapt to varying propagation environments and optimize both interference management and spectral efficiency under different operating conditions.
3Productivity
If frequency reuse factor of one is used to maximize spectral efficiency, then data and control channels experience interference from other sectors/cells, especially for UEs at the edge of a cell
Solution Approach 1:
The patent changes the power transmission parameter from a fixed full-power mode to a dynamic fractional power mode. The fractional power control parameter is adjusted based on path loss thresholds and channel conditions, transforming the power transmission from a static parameter to a dynamically optimized parameter that adapts to varying propagation conditions.
Data Source
AI summary
To address the need for a resource allocation scheme that results in a better tradeoff between the cell-edge performance and the overall spectral efficiency, a communication system is provided that allocates uplink transmit power to user equipment (UEs) based on a fractional power control scheme. In another embodiment, since the cell-edge users are also likely to be power limited, the communication system may implement a minimized uplink transmission bandwidth resource allocation scheme that may work with the fractional power control scheme to achieve a level of performance desired for uplink transmissions in 3GPP (Third Generation Partnership Project) and 3GPP2 Evolution communication systems.