Optical Network Unit Instance Switching for PON Adaptability
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Solution Overview
Problem
Existing optical communication systems in passive optical networks (PONs) face challenges in efficiently managing multiple upstream communication settings and instances within an optical network unit (ONU), leading to suboptimal performance and limited flexibility in adapting to changing communication demands.
Innovation Solution
The implementation of multiple ONU instances within an ONU, each with distinct allocation identifiers and upstream communication settings, allows for concurrent active operation. This setup enables seamless switching between different communication settings on a burst-to-burst basis, supported by an optical line terminal (OLT) that manages these instances through control messages and scheduling information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single ONU instance is used with fixed upstream communication settings, then the device complexity is reduced, but the adaptability to changing communication demands deteriorates
Solution Approach 1:
The patent segments the ONU functionality into multiple independent ONU instances, where each instance maintains its own upstream communication settings (rate, FEC code, allocation identifier). This segmentation allows the system to adapt to different communication demands by activating appropriate instances without requiring complete reconfiguration of the ONU, thus improving adaptability while keeping individual instance complexity manageable.
Solution Approach 2:
The patent implements dynamic switching between different ONU instances based on changing communication demands. The ONU can dynamically select which instance to use for upstream communications by receiving scheduling information from the OLT and switching instances on a burst-to-burst basis. This dynamic behavior enables the system to adapt to varying communication requirements without permanent reconfiguration.
2Adaptability or versatility
If multiple ONU instances with different upstream communication settings are supported concurrently, then the flexibility of the system is improved, but the device complexity increases
Solution Approach 1:
The patent makes the ONU universal by enabling it to support multiple ONU instances concurrently, where each instance can operate with different upstream communication settings. The ONU hardware and control logic are designed to handle multiple instances simultaneously, allowing the same physical device to serve multiple logical functions with different configurations, thus improving flexibility without requiring separate physical devices for each configuration.
Solution Approach 2:
The patent creates virtual copies of the ONU instance through instantiation based on control messages from the OLT. Instead of creating separate physical devices, the system generates software-defined copies of ONU instances that can be activated or deactivated as needed. This copying approach allows multiple configurations to coexist in the same physical device while maintaining the functionality of each instance.
3Adaptability or versatility
If the ONU switches between different communication settings, then the adaptability is improved, but the loss of time for reconfiguration increases
Solution Approach 1:
The patent prepares multiple ONU instances in advance, with each instance pre-configured with specific upstream communication settings (rate, FEC code, allocation identifier). When switching is needed, the ONU simply activates a pre-prepared instance rather than reconfiguring from scratch. This preliminary preparation eliminates reconfiguration time and enables instant switching between different communication settings.
Solution Approach 2:
By creating virtual copies of ONU instances through instantiation, the system avoids the time-consuming process of reconfiguring a single instance. Each copy is independently configured and ready for immediate use, allowing the ONU to switch between instances without reactivation delays that would occur with traditional reconfiguration methods.
4Adaptability or versatility
If multiple ONU instances are instantiated based on control messages, then the adaptability to different allocation identifiers is improved, but the device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the OLT sends control messages to the ONU to instantiate and manage multiple ONU instances. The OLT has knowledge of which instances should be active and communicates this information to the ONU, allowing centralized management of instance creation and configuration. This feedback loop simplifies the complexity by externalizing the management decisions to the OLT.
Data Source
AI summary
Various example embodiments for supporting optical communications in an optical communication system are presented herein. Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications within a passive optical network (PON) including an optical line terminal (OLT) and an optical network unit (ONU) where communications between the OLT and the ONU is supported based on support for multiple ONU instances of the ONU within the PON.