Flexible Remote Node Wavelength Routing for PON Traffic
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Solution Overview
Problem
Passive optical networking (PON) and mobile backhaul systems face challenges in dynamic traffic allocation, leading to partial idling and discontinuous service when user groups require full capacity, as existing solutions lack flexibility in wavelength routing, resulting in users having to wait for service availability.
Innovation Solution
A flexible remote node with wavelength selective switching and multi-cast switching capabilities allows for dynamic traffic rerouting from low-capacity user groups to high-capacity groups, using individual wavelength channels to ensure continuous service by reallocating WDM channels based on demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TDM-based PON or MBH systems use partial idling to handle traffic jams, then some users can share the service, but users have to wait for service availability and service becomes discontinuous
Solution Approach 1:
The patent implements dynamic traffic allocation by enabling the flexible remote node to switch wavelength channels in real-time based on demand. The system transitions from static TDM time slots to dynamic wavelength routing, allowing ONUs to be dynamically assigned to different wavelength channels according to their current traffic requirements, eliminating the need for users to wait for service availability.
Solution Approach 2:
The system changes the allocation parameter from time-based (TDM) to wavelength-based (WDM) allocation. By allowing flexible switching between wavelength channels, the system can immediately reallocate capacity to users with high demand without time delays, thus maintaining continuous service while improving adaptability to traffic conditions.
2Device complexity
If each ONU group has its own wavelength in TDM-PON, then wavelength resources are allocated statically, but there is no flexibility to reallocate when capacity requirements change
Solution Approach 1:
The flexible remote node is designed with multi-functionality to perform both wavelength selection and switching operations. It can serve multiple ONU groups dynamically by selecting appropriate wavelength channels and routing them to different destinations based on real-time traffic conditions, thus providing adaptability without requiring a completely new system architecture.
Solution Approach 2:
The flexible remote node acts as an intermediary between the OLT and multiple ONU groups. It receives wavelength channels from the OLT and can dynamically route them to different ONU groups based on demand, providing flexibility in wavelength allocation while maintaining a relatively simple overall system structure.
3Productivity
If users are separated into different time slots to provide full capacity, then all users can access service simultaneously, but some users must be idled and service becomes discontinuous
Solution Approach 1:
The system transitions from time-based resource allocation (TDM) to wavelength-based allocation (WDM). By utilizing the wavelength dimension instead of time slots, the system allows multiple users to access service simultaneously without mutual exclusion, eliminating waiting time while maintaining full capacity availability for all users.
Data Source
AI summary
A computer implemented method for dynamically allocating traffic in a passive optical communication system includes employing an individual wavelength channel to carry different data services from an individual transmitter, configuring an optical network unit into optical network unit groups serving at least two community of users; and providing a flexible remote node with wavelength routing flexibility including switching wavelength traffic from optical network user groups with low capacity requirements to optical network user groups with increased wavelength traffic requirements.