EPON Backhaul Multiplexing for Scalable Wireless Networks
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Solution Overview
Problem
Wireless service providers face challenges in providing scalable and cost-effective backhaul solutions with minimal delay, as existing T1 lines become overwhelmed with increasing traffic, limiting bandwidth and scalability in wireless communication networks.
Innovation Solution
A system utilizing an Ethernet passive optical network with pseudowire connections and wavelength division multiplexing to multiplex backhaul signals from base transceiver stations, allowing communication with mobile switching centers and enabling scalable and secure bandwidth management across multiple service providers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If T1 lines are used to carry backhaul for wireless packet data communications, then backhaul delay is kept low (approximately 1 ms per 125 miles), but scalability is limited as traffic increases
Solution Approach 1:
The patent combines multiple T1 backhaul lines into a single optical network connection, aggregating their capacities. Multiple base transceiver stations and mobile switching centers share a common optical infrastructure, merging previously separate T1 connections into a unified high-capacity backbone that maintains low delay while providing scalable bandwidth.
Solution Approach 2:
The optical network infrastructure serves multiple functions simultaneously: it carries backhaul for multiple service providers, supports both voice and packet data traffic, and provides connectivity between different mobile switching centers. This multi-functional approach replaces the single-purpose T1 lines with a versatile platform that scales to meet diverse traffic demands.
2Quantity of substance
If additional T1 lines are added to increase bandwidth, then backhaul capacity increases, but device complexity and cost increase significantly
Solution Approach 1:
Instead of adding more separate T1 lines, the patent merges multiple existing backhaul connections into a unified optical network. This consolidation increases total bandwidth while reducing the number of individual connection management tasks, thereby lowering operational complexity despite the increased capacity.
Solution Approach 2:
The patent transitions from electrical T1 signals to optical signals, fundamentally changing the transmission medium's parameters. This parameter change enables dramatically higher bandwidth capacity without proportionally increasing network complexity, as the optical infrastructure handles multiple T1-equivalent streams through wavelength division multiplexing and other optical techniques.
3Ease of manufacture
If multiple service providers share the same backhaul infrastructure, then cost-effectiveness improves, but security and isolation between providers become challenging
Solution Approach 1:
The optical network is segmented into logically isolated virtual channels or wavelengths, with each service provider assigned dedicated resources. This segmentation allows multiple providers to share the physical infrastructure cost-effectively while maintaining security and isolation, as each provider's traffic is confined to its designated segment through optical or logical separation mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides scalable and secure backhaul management, maintaining minimal delay and accommodating various protocols, while ensuring dedicated bandwidth and security for wireless service providers, enhancing the reliability and efficiency of wireless communication networks.
Implementation Method 1
these signals are provided on different pseudowire connections within a single wavelength lambda on the passive optical network. In another embodiment, the signals are provided on different lambdas of the network
Data Source
AI summary
A system is described for providing backhaul over an Ethernet passive optical network (EPON). The backhaul may be backhaul for EV-DO and/or EV-DO Rev. A communications. The system for includes at least one cell site. At least two base transceiver stations are located at the cell site. The base transceiver stations receive radio signals from respective mobile stations. A first one of the base transceiver stations provides a first backhaul signal, and a second one of the base transceiver stations provides a second backhaul signal. The cell site multiplexes these backhaul signals together onto an Ethernet passive optical network. In one embodiment, these signals are provided on different pseudowire connections within a single wavelength lambda on the passive optical network. In another embodiment, the signals are provided on different lambdas of the network.