EPON Remote Node Registration Collision Control
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Solution Overview
Problem
Current Ethernet passive optical networks (EPONs) face bandwidth bottlenecks during the discovery process due to high collision probabilities of response messages from multiple virtual remote nodes seeking registration, leading to prolonged discovery mode durations and reduced usable bandwidth for regular data transmission.
Innovation Solution
Implementing a system where multiple virtual remote nodes coupled to a common physical remote node transmit response messages within a controlled discovery slot, using techniques such as queue management, retry mechanisms, and aggregate message transmission to minimize collisions and optimize bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple virtual remote nodes transmit response messages simultaneously during discovery, then registration speed is improved, but collision probability increases
Solution Approach 1:
The system performs preliminary actions by having the OLT send a solicitation message before the discovery slot, notifying remote nodes of the upcoming opportunity to transmit. This allows remote nodes to prepare their response messages in advance, reducing transmission delays while maintaining collision avoidance through controlled timing.
Solution Approach 2:
The discovery process is segmented into distinct phases: solicitation message transmission, discovery slot allocation, and response message transmission. This segmentation allows the system to manage multiple virtual remote nodes systematically, assigning each a specific time window within the discovery slot to transmit, thereby maintaining high registration speed while preventing collisions.
2Quantity of substance
If discovery mode duration is extended to accommodate multiple registrations, then registration completeness is improved, but usable bandwidth for regular transmission is reduced
Solution Approach 1:
The system uses periodic action by implementing cyclic discovery modes that alternate between discovery operation and normal data transmission. Within each discovery cycle, multiple virtual remote nodes are registered efficiently using allocated discovery slots, after which the system transitions to normal transmission mode, maximizing both registration completeness and usable bandwidth time.
Solution Approach 2:
The system maintains continuity of useful action by ensuring that during normal transmission mode, the upstream bandwidth is fully utilized for data transmission. The discovery mode is kept brief and efficient, registering multiple nodes in parallel where possible, thereby minimizing the time lost to discovery while ensuring all necessary nodes are registered.
3Productivity
If discovery slot allocation is optimized for speed, then registration efficiency is improved, but collision avoidance capability is worsened
Solution Approach 1:
The system implements feedback by having the OLT monitor the discovery slot for collision detection. When collisions are detected, the OLT can adjust subsequent discovery slot allocations, extend discovery windows, or implement retry mechanisms. This feedback loop maintains high registration efficiency while dynamically adapting to prevent or resolve collisions.
Solution Approach 2:
The discovery slot allocation is made dynamic rather than static. The OLT can adjust the number and duration of discovery slots based on the number of unregistered remote nodes detected, the collision rate observed, and the current network load. This dynamic adjustment optimizes registration efficiency while maintaining collision avoidance capability.
Data Source
AI summary
One embodiment of the present invention provides a system that facilitates registration of remote nodes in an Ethernet passive optical network (EPON). The system includes a central node and at least one remote node, wherein a number of virtual remote nodes are coupled to a common physical remote node and transmit upstream data through a common transmitter within the common physical remote node. During an initial discovery cycle, the system receives a solicitation message from the central node at a remote node, wherein the solicitation message assigns a discovery slot in which an unregistered remote node may transmit a response message to the central node for registration. The system then transmits a response message from an unregistered remote node to register within the assigned discovery slot. If multiple virtual remote nodes coupled to the common physical remote node seek registration concurrently, the system controls the transmission of response messages from these virtual remote nodes to the central node so as to avoid collisions between response messages from different remote nodes.