Bi-directional Policer for Half-Duplex Mediums
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Solution Overview
Problem
Current network traffic policing in wireless networks is uni-directional, which is inadequate for half-duplex communication media where simultaneous usage in one direction affects availability in the opposite direction, leading to inefficient resource management and potential network performance issues.
Innovation Solution
Implementing bi-directional policers that measure and manage traffic flow in both directions using shared metrics, allowing for flexible data rate constraints and remedial actions, such as token bucket policing, to ensure fair resource utilization regardless of transmission direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uni-directional policers are used in full-duplex wired networks, then each direction can independently enforce data rate limits, but this approach fails to account for shared medium constraints in half-duplex wireless networks where usage in one direction impacts availability in the opposite direction
Solution Approach 1:
The policer is designed to function universally across both full-duplex and half-duplex network media by incorporating a medium type detection mechanism. The same policer infrastructure can enforce data rate limits in wired networks independently per direction, while automatically adapting to enforce shared medium constraints in wireless networks by monitoring aggregate usage across both directions.
Solution Approach 2:
The policer dynamically adjusts its enforcement behavior based on the detected medium type. In half-duplex wireless mode, the system transitions from static independent directional enforcement to dynamic coordinated enforcement where data rate limits are applied to the aggregate of both directions, reflecting the shared nature of the wireless medium.
2Productivity
If data rate limits are enforced independently in each direction, then implementation is simpler, but this leads to inefficient resource utilization in half-duplex networks where one direction may be underutilized while the other is overloaded
Solution Approach 1:
The policer functionality is segmented into independent modular components: a medium type detection module, a configuration module that stores separate data rate limits for different directions and medium types, and an enforcement module that selectively applies appropriate limits. This segmentation allows the system to handle complex half-duplex enforcement logic while maintaining implementation simplicity through modular design.
3Reliability
If separate data rate limits are configured for upstream and downstream directions, then each direction can be optimized independently, but this prevents effective enforcement of overall medium capacity constraints in shared wireless environments
Solution Approach 1:
The system introduces a configuration intermediary layer that bridges the gap between separate directional limits and aggregate medium constraints. This intermediary configuration structure allows administrators to define both direction-specific data rate limits and overall medium capacity limits, with the enforcement logic automatically coordinating these constraints based on detected medium type, ensuring accurate enforcement without sacrificing configuration flexibility.
Data Source
AI summary
A bi-directional policer especially suitable for application in, but not limited to, wireless networks or other shared access or half-duplex communication mediums. In a particular implementation, bi-directional policers measure a flow of frames (L2) or packets (L3) in both directions and apply policing actions accordingly.