PON Terminal Discovery Response Rate Segmentation
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Solution Overview
Problem
In multi-rate PON systems, unregistered terminals face challenges in prompt and reliable registration due to uncertainty in transmission rates, leading to potential failure in receiving registration request signals and establishing synchronization.
Innovation Solution
A PON system where unregistered terminals make a discovery response at a limited predetermined transmission rate, allowing the station apparatus to receive the response more effectively, with the option to switch transmission rates based on terminal types and generational changes, and using wavelength multiplexing for downstream communication to increase capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the station apparatus waits for discovery responses at all possible transmission rates, then it can potentially receive responses from any terminal type, but the receive function becomes complex and synchronization establishment takes longer
Solution Approach 1:
The patent segments the discovery process by dividing terminals into two categories: unregistered terminals that send discovery responses at a predetermined rate, and registered terminals that communicate at their assigned rates. This segmentation allows the station apparatus to handle different terminal types through separate, simplified receive functions rather than one complex universal receiver.
Solution Approach 2:
The patent introduces a predetermined transmission rate as an intermediary layer between terminals of various rates and the station apparatus. Unregistered terminals use this intermediary rate for discovery responses, allowing the station apparatus to receive them through a simplified receive function tuned to this specific rate, without needing to handle all possible terminal rates simultaneously.
2Reliability
If the station apparatus uses a simplified receive function for a single predetermined transmission rate, then discovery responses can be received more promptly and reliably, but the system cannot accommodate terminals of different transmission rates
Solution Approach 1:
The patent applies dynamics by making the transmission rate adaptable based on terminal registration status. Unregistered terminals use a predetermined rate for discovery, while registered terminals dynamically use their assigned rates. The station apparatus similarly adapts its receive function - using a simplified single-rate receiver for discovery responses and more complex multi-rate receivers for established communications.
Solution Approach 2:
The patent performs preliminary action by establishing a predetermined transmission rate before terminal registration occurs. This preliminary rate setup allows the station apparatus to prepare a simplified receive function in advance, ensuring reliable and prompt reception of discovery responses before the complexity of handling multiple terminal rates is needed.
3Adaptability or versatility
If discovery responses are transmitted at multiple transmission rates, then all terminal types can participate in the discovery process, but the time to establish synchronization increases
Solution Approach 1:
The patent segments the discovery response transmission by having unregistered terminals use a predetermined transmission rate regardless of their ultimate operating rate. This segmentation allows the station apparatus to process all discovery responses through a single, optimized receive function, establishing synchronization quickly, before transitioning to rate-specific communications for registered terminals.
4Adaptability or versatility
If the system supports multi-rate operation from the beginning, then all terminal types can be accommodated, but the system complexity and cost increase
Solution Approach 1:
The patent segments terminal handling into discovery phase and operational phase. During discovery, all terminals use a predetermined rate, allowing simple receive function. During operation, terminals use their assigned rates with more complex receive functions. This temporal and functional segmentation reduces overall system complexity while maintaining multi-rate support.
Solution Approach 2:
The patent performs preliminary action by establishing a predetermined transmission rate and simplified receive function before terminal registration. This preliminary setup keeps initial system complexity low, allowing terminals of any type to join without requiring the full multi-rate infrastructure to be in place from the beginning.
Data Source
AI summary
In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).