PON Multicast Management for Bandwidth Conservation
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Solution Overview
Problem
The existing PON systems only support unicast and broadcast mechanisms, leading to bandwidth wastage by sending the same data repeatedly to multiple ONUs and inefficient management, with no support for multicast, which is essential for Video On Demand services, especially in large-split-ratio networks.
Innovation Solution
A PON multicast communication system with an OLT and ONU equipped with multicast modules to manage and control multicast communications, allowing data to be sent efficiently to multiple ONUs through multicast groups, reducing bandwidth usage and enabling unified management of nearby ONUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unicast mechanism is used to send data to multiple ONUs, then each ONU can receive data individually, but bandwidth is wasted by sending the same data repeatedly
Solution Approach 1:
The patent merges multiple unicast data streams into a single multicast data stream. The OLT creates one multicast frame containing the same data that would otherwise be sent separately to multiple ONUs, combining the transmission resources and eliminating redundant data copies in the network.
Solution Approach 2:
The patent uses selective copying where the OLT copies the multicast data frame only to those ONUs that have registered for the specific multicast group, rather than copying to all ONUs. This targeted copying approach reduces unnecessary bandwidth consumption while ensuring reliable delivery to interested recipients.
2Ease of operation
If broadcast mechanism is used to send data to all ONUs, then data delivery is simple, but bandwidth is wasted by sending data to ONUs that do not need it
Solution Approach 1:
The patent applies local quality by making the broadcast transmission selective rather than universal. Each ONU receives the multicast frame, but only ONUs that are members of the specific multicast group process and accept the data. Other ONUs discard the frame, achieving targeted delivery with simplified transmission mechanics.
Solution Approach 2:
The patent introduces dynamic group membership management where ONUs can dynamically join or leave multicast groups by sending registration requests to the OLT. The OLT maintains dynamic records of which ONUs belong to which multicast groups, allowing the system to adapt to changing user preferences and service requirements.
3Manufacturing precision
If each ONU is managed separately for power adjustment, then individual ONU requirements are met, but management efficiency is low
Solution Approach 1:
The patent merges the management of multiple ONUs into a single multicast group entity. The OLT can send a single power adjustment command to a multicast group, and all member ONUs receive and execute the command simultaneously, combining what would otherwise require multiple separate management operations into one efficient action.
Solution Approach 2:
The patent creates a multicast group that serves multiple functions: it enables efficient data distribution to selected ONUs, provides a mechanism for group-based power management, and allows for scalable service delivery. The same multicast infrastructure supports both data transmission and management functions across multiple ONUs.
Data Source
AI summary
A Passive Optical Network (PON) multicast management method includes: an Optical Line Terminal (OLT) performs multicast control according to multicast control information, and generates a corresponding multicast downstream command; the OLT sends the multicast downstream command to an Optical Network Unit (ONU); and the ONU resolves the multicast downstream command, and performs multicast control according to the multicast downstream command. Accordingly, a PON multicast communication system, an OLT, and an ONU are disclosed. Through the multicast control mechanism introduced into the PON system, the PON multicast functions are enhanced, and the same data destined for multiple ONUs is prevented from being sent repeatedly in the network, and thus the network bandwidth resources are saved.