Uplink Interference Congestion Control in Wireless Nodes
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Solution Overview
Problem
In wireless communication systems, especially those using interference suppression capable receivers, existing fast congestion control methods are ineffective due to the inability to measure load after interference suppression processing, leading to increased risk of power rushes and instability in power control loops.
Innovation Solution
A method and arrangement for uplink interference congestion control that applies interference suppression to received signals, estimates a rise over thermal value, and determines a load measure based on this value to control interference congestion, specifically designed for interference suppression capable receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interference suppression is applied to received signals, then performance in terms of peak data rates and system throughput is improved, but the ability to measure load accurately deteriorates
Solution Approach 1:
The patent introduces an intermediary load estimation mechanism that operates on the original received signals before interference suppression processing. This intermediary estimation provides accurate load measurement while allowing interference suppression to improve throughput, thus resolving the contradiction between productivity improvement and measurement precision deterioration.
Solution Approach 2:
The patent segments the signal processing into two independent paths: one path applies interference suppression for throughput improvement, while the other path performs load estimation on the original signals for accurate measurement. This segmentation allows both objectives to be achieved simultaneously without interference between the processes.
2Reliability
If conventional fast congestion control is used in interference suppression capable receivers, then power control stability is maintained under normal conditions, but the risk of power rushes increases near pole capacity
Solution Approach 1:
The patent implements a feedback mechanism where the load estimator continuously monitors the uplink load and provides feedback to the congestion control function. This feedback enables the system to detect approaching pole capacity conditions and adjust power control parameters proactively, maintaining stability while preventing power rushes near capacity limits.
Solution Approach 2:
The patent performs preliminary load estimation and congestion assessment before power rushes can occur. By estimating load on original signals and projecting future load conditions, the system takes preliminary actions to prevent power rushes, thereby maintaining reliability while reducing the harmful effect of power surges.
3Adaptability or versatility
If load measurement is performed before interference suppression, then load can be estimated using conventional methods, but the measurement becomes too conservative and reduces system capacity
Solution Approach 1:
The patent changes the parameter used for load measurement from conventional signal power to an estimated load parameter derived from original received signals. This parameter change allows the system to account for interference suppression effects, making congestion control more adaptive while increasing system capacity by reducing conservative limitations.
Data Source
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AI summary
In a method of uplink interference congestion control in an interference suppression capable receiving node associated with a plurality of users in a wireless communication system, applying interference suppression (S10) to received signals in the node, to provide interference suppressed received signals. Subsequently, estimating (S20) a rise over thermal value for the uplink, based on the interference suppressed received signals, and determining (S30) a load measure for the uplink based on the estimated rise over thermal value. Finally, controlling (S40) interference congestion on the uplink based on the determined load measure.