Power Control Command Filter for Wireless Systems
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Solution Overview
Problem
Conventional uplink transmit power control mechanisms in wireless communication systems face issues with stability, capacity, and coverage, particularly experiencing power rushes and fluctuations in Signal-to-Interference Ratio (SIR) due to fast power control loops and non-orthogonal designs, leading to reduced performance and increased interference.
Innovation Solution
A method and device for filtering power control commands in wireless communication systems, where a power-up command is replaced with a power-down command if it is preceded by a sequence of consecutive power-up commands, effectively limiting the length of power-up command sequences and maintaining longer sequences of power-down commands, thereby stabilizing the system and improving throughput and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast power control loops are used to quickly adjust transmit power, then responsiveness to channel quality changes is improved, but system stability deteriorates and power rushes occur
Solution Approach 1:
The filter is configured to anticipate and prevent power rushes by limiting the number of consecutive power-up commands before they occur. When the filter detects that the maximum number of consecutive power-up commands has been reached, it proactively replaces subsequent power-up commands with power-down commands, preventing the instability and power rushes that would otherwise occur in fast power control loops.
Solution Approach 2:
The filter continuously monitors the sequence of power control commands and adjusts its behavior based on the detected pattern. By counting consecutive power-up commands and comparing against a threshold, the filter provides feedback control that modulates the power control loop behavior to maintain stability while preserving fast response capabilities.
2Stability of the object's composition
If the maximum number of consecutive power-up commands is limited, then system stability is improved, but the ability to rapidly increase power when needed is reduced
Solution Approach 1:
The filter dynamically adapts its behavior based on the current state of the power control command sequence. It allows the maximum number of consecutive power-up commands to pass through when the system needs rapid power increases, but automatically activates limiting behavior when the threshold is reached, creating a dynamic balance between power increase capability and system stability.
Solution Approach 2:
The filter changes the state parameter of power control commands by replacing power-up commands with power-down commands when the maximum consecutive count is reached. This parameter transformation effectively converts aggressive power increase attempts into power reduction commands, stabilizing the system while preserving the ability to increase power through normal command sequences.
3Stability of the object's composition
If power control commands are filtered to prevent power rushes, then SIR fluctuations are reduced, but the complexity of the power control mechanism increases
Solution Approach 1:
The filter segments the power control command stream into individual commands that can be independently evaluated. By processing each command separately and counting consecutive power-up commands, the filter applies a simple segmentation-based approach that reduces SIR fluctuations without requiring complex algorithms or multiple processing stages.
Solution Approach 2:
The filter uses a simple counter variable to track consecutive power-up commands, which is a computationally inexpensive and transient data structure. This disposable counter is reset or incremented with each command processed, providing an low-complexity mechanism for achieving SIR stability without requiring sophisticated filtering algorithms or additional hardware components.
Data Source
AI summary
There is provided a device for filtering a stream of power control commands including power-up and power-down commands for uplink transmit power control in a wireless communication system. The device (100) includes a sequence tester (102) configured to determine whether a power-up command is immediately preceded by a sequence of consecutive power-up commands. The device also includes a command replacer (104) configured to replace, when it is determined that the power-up command is immediately preceded by a sequence of consecutive power-up commands, the power-up command with a power-down command.