Hierarchical Network Collision Prevention via Time Slot Segmentation
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Solution Overview
Problem
In hierarchical smart metering networks, collisions between nodes at different levels occur due to hidden nodes, leading to reduced network performance and dropped packets, as existing collision avoidance protocols like CSMA-CA are ineffective in preventing simultaneous transmissions from alternate levels.
Innovation Solution
The system divides the communication time frame into sub-intervals corresponding to each level of the network hierarchy, allowing nodes to transmit only during their designated sub-interval, thereby preventing collisions between nodes at alternate levels by using an arbiter to determine and select the appropriate transmission time based on the node's level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If collision avoidance protocols like CSMA-CA are used in hierarchical smart metering networks, then nodes can transmit data autonomously, but collisions occur between nodes at alternate levels due to hidden nodes
Solution Approach 1:
The communication time frame is segmented into multiple time sub-intervals, with each sub-interval assigned to a specific hierarchical level. Nodes at different levels transmit during different sub-intervals, preventing collisions between hidden nodes at alternate levels while maintaining autonomous transmission capability.
2Productivity
If nodes at different hierarchical levels transmit simultaneously, then network utilization is improved, but collisions occur leading to dropped packets
Solution Approach 1:
The system implements periodic time frames with repeating patterns of time sub-intervals assigned to different hierarchical levels. This periodic structure allows nodes to transmit systematically in their designated sub-intervals, preventing collisions while maintaining high network utilization through structured concurrent transmissions.
Data Source
AI summary
A system and method for reducing transmission collisions. In one embodiment, a transmitter for communicating of a smart grid power line network includes an arbiter. The arbiter is configured to select a transmission interval during which the transmitter can transmit. The interval is selected from a plurality of available transmission intervals reserved for contending transmissions, and selected based on a level of a hierarchical network at which the transmitter is located. The interval selected is different from any interval used by a different transmitter spaced two hierarchical levels away from the level of the hierarchical network at which the transmitter is located.