Dynamic Transmit Power Control for Random Access Collisions
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Solution Overview
Problem
Wireless communication networks employing random access schemes face issues such as collisions, near-far effect, and inefficient power resource utilization, leading to delays and unfair access opportunities, especially in battery-powered devices with limited power resources.
Innovation Solution
A method and control device that dynamically adjust the transmit power level based on access information, increasing or decreasing the power level depending on collision occurrence and access grant status to optimize channel access in wireless communication networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed transmit power levels are utilized in random access scheme, then device complexity is reduced, but power resources are not utilized effectively and near-far effect occurs
Solution Approach 1:
The patent implements dynamic transmit power adjustment where the mobile station adapts its transmit power level based on feedback from the base station. The power level is adjusted in steps based on whether collision occurred and whether channel allocation was granted, transforming the static power control into a dynamic adaptive system that optimizes power usage while maintaining simplicity.
Solution Approach 2:
The system uses feedback from the base station (collision indication and channel allocation grant status) to adjust transmit power levels. The mobile station receives feedback about whether a collision occurred and whether channel allocation was granted, then adjusts its transmit power accordingly for subsequent access attempts, creating a closed-loop control system.
2Reliability
If random back-off method is used to avoid repeated collisions, then collision resolution is improved, but access delay increases
Solution Approach 1:
The patent adjusts transmit power levels in advance based on collision history and channel allocation status before the next access attempt. By preliminarily setting the appropriate power level based on previous outcomes, the system reduces the need for repeated back-off delays and multiple access attempts, thereby reducing overall access delay while maintaining collision resolution effectiveness.
3Device complexity
If signals from closer terminals are transmitted at same power level as farther terminals, then device complexity is reduced, but near-far effect causes signals from farther terminals to be overshadowed
Solution Approach 1:
The patent applies different transmit power levels to different mobile stations based on their specific conditions (collision history and channel allocation status). Instead of using a uniform power level for all terminals, the system tailors the power level locally to each terminal's access outcome, thereby mitigating the near-far effect without requiring complex distance-based power control mechanisms.
Data Source
AI summary
A method and control device for generating a transmit power level for a communication apparatus for operation in a wireless communication network having a network node. The control device comprises a controller adapted to generate a request message for requesting access to a communication channel, to be transmitted to the network node. The control device is also adapted to determine whether access to the communication channel has been granted in response to the request message. A transmit power control unit is adapted to generate a transmit power level for the communication apparatus in dependence of whether access to the communication channel has been granted.