PUSCH Power Control via Adjacent Cell Interference Feedback
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Solution Overview
Problem
The existing uplink PUSCH power control methods in LTE systems fail to effectively manage interference between adjacent cells, leading to unstable system performance, especially for cell-edge users, due to the reliance on fixed or real-time interference measurements that do not account for varying interference levels across adjacent cells.
Innovation Solution
A PUSCH power control method that receives interference level information from adjacent cells, counts the number of low, intermediate, and high interference levels, and adjusts the PUSCH power for the current cell user using equations that determine an interference value to update power compensation factors, target SINR, and other parameters, thereby performing power control based on the interference among adjacent cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed or real-time interference measurements are used for power control, then power control can be performed, but system performance becomes unstable especially for cell-edge users due to not accounting for varying interference levels across adjacent cells
Solution Approach 1:
The patent applies dynamics by making the power control system adaptive to changing interference conditions. The base station dynamically adjusts the PUSCH power control parameters based on real-time interference level information received from adjacent cells, transforming a static power control mechanism into a dynamic one that responds to varying interference environments, thereby improving system performance stability for cell-edge users.
Solution Approach 2:
The patent implements feedback by having the base station receive interference level information from adjacent cells and use this feedback to adjust power control parameters. The interference level information acts as feedback about the current interference environment, which is then processed to determine appropriate power adjustments, creating a closed-loop control system that improves reliability through continuous adaptation.
2Object-affected harmful factors
If PUSCH power is adjusted based on interference levels from adjacent cells, then interference between cells is reduced and user performance is improved, but additional signaling overhead is required for transmitting interference level information
Solution Approach 1:
The patent uses an intermediary approach by having the base station process and aggregate interference level information from multiple adjacent cells before using it for power control decisions. The base station acts as an intermediary that collects raw interference data, processes it into meaningful metrics, and then applies power adjustments, thereby reducing the direct signaling overhead while still achieving interference mitigation.
3Loss of information
If open-loop power control is used, then no additional signaling overhead is required, but transmission power determination is inaccurate due to difference between transmitter's understanding of channels and actual channel conditions
Solution Approach 1:
The patent introduces an intermediary feedback mechanism where the base station (receiver) processes interference level information and generates power control adjustments that are then applied by the transmitter. This intermediary processing at the receiver side enables more accurate power determination without requiring direct channel state information exchange, thus maintaining low signaling overhead while improving accuracy.
Data Source
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AI summary
The present disclosure provides a PUSCH power control method and a PUSCH power control apparatus. According to the present disclosure, the interference of a current cell on its adjacent cells is determined in accordance with interference level information from the adjacent cells, so it is able to adjust PUSCH power for a current cell user, thereby to perform the power control in accordance with the interference among the adjacent cells.