360 likes | 540 Views
A WDM Passive Optical Network Architecture for Multicasting Services. Student : Tse-Hsien Lin Teacher : Ho-Ting Wu Date : 2005.05.31. Outline. Background Motivations A WDM Passive Optical Network Architecture The Proposed Multicast Algorithm Simulation Future work Conclusions Reference.
E N D
A WDM Passive Optical Network Architecture for Multicasting Services Student:Tse-Hsien Lin Teacher:Ho-Ting WuDate:2005.05.31
Outline • Background • Motivations • A WDM Passive Optical Network Architecture • The Proposed Multicast Algorithm • Simulation • Future work • Conclusions • Reference
Background • PON • TDM PON • WDM PON
Passive Optical Network • In a PON, all components between the end users and the central office (CO) are passive, such as optical fibers and couplers
The TDM PON • In a TDM PON, end users share the bandwidth in time domain • In the CO, an optical line terminal (OLT) transmits the downstream traffic to the end users and manages the upstream traffic flows from the end users
The WDM PON • What’s is WDM • At the same time, The fiber can carry Independent data streams on different wavelengths • WDM PONs create point-to-point links between the CO and end user, no sharing wavelength • Advantage • Scalable • High Capacity
Motivations • Network Environments • WDM Passive Optical Network • Wavelength Spatial Reused • Downstream • Multicast Transmission • Unicast Transmission • To Design a Multicast Scheduling Algorithm • Simple • Efficient • Scalable
Arrayed Waveguide Grating • The AWG is a wavelength-routing device • Every second wavelength is routed to the same output port • This period of the wavelength response is called free spectral range (FSR)
SUCCESS-DWA PON Architecture -Previous Works • TL = Tunable laser CH X = Thin-film WDM filter
A WDM Passive Optical Network Architecture • OLT use four tunable lasers to transmit control message on control channel or data packet on any wavelength • Each ONU consists of a tunable receiver which allow them to receive control message on a control channel (or data on any wavelength) • The multicast packet is received by the ONUs attached to the corresponding splitter • Each splitter equally distributes all incoming wavelengths to all attached receivers.
TL Timing Structure • Each TL transmits control message which corresponded to the ONUs of the same AWG output port in the control time • Each TL transmits data packet to reach all ONUs attached to the same AWG output port in the data time • A control packet consists of four fields, destination address, guard time of each destination, wavelength, and offset time
Function Diagrams of the OLT and ONU • Dispatch packet • Sequence • Random • Short Queue First • The Scheduler Multicast Algorithm was satisfied • Partition or without Partition • Receiver Collision
The Proposed Multicast Algorithm • An All-out Packet Is Defined to Be a Queued Packet with All of Its Intended Recipients Free and at the same AWG output port in the Scheduling Time
The scenario of multicast algorithm • The HOL packet of Queue 1 is all-out packet
Simulation (Unicast) • The parameters are N = 64 ONUs • The Tunable laser TLs = 4 • Packet generation follows the Poisson arrival process with parameter λ = 0.04~0.36 • The time slot = 12us • The Simulation during 1000000 slot time • TDM Four-TDM-PON • DWA SUCCESS-DWA PON
Simulation (Multicast) • The parameters are N = 64 ONUs • The Tunable laser TLs = 4 • Packet generation follows the Poisson arrival process with parameter λ = 0.02~0.18 • The time slot = 12us • The destination nodes of a multicast packet are randomly selected among all ONU • The ONUs in the multicast size S are randomly chosen from the uniform distribution [1,5] • The Simulation during 250000 slot time
Proposed Multicast Scheduling Algorithms – LookBack Mechanism • Search for an All-out Packet in the Input Queue up to the Lookback Length L
Simulation (Multicast Length) • The parameters are N = 64 ONUs • The Tunable laser TLs = 4 • Packet generation follows the Poisson arrival process with parameter λ = 0.02~0.18 • The time slot = 12us • The destination nodes of a multicast packet are randomly selected among all ONU • The ONUs in the multicast size S are randomly chosen from the uniform distribution [1,5] • The LookBack Length L = 1,2,3,4,5,10,15,20,100,1000,10000,∞ • The Simulation during 250000 slot time
Future work • Performance Key • Packet delay • Receiver throughput
Conclusion • Proposed The Multicast Scheduling Mechanism for WDM Passive Optical Network
Reference • Ho-Ting Wu, Po-Hsin Hong, and Kai-Wei Ke, “On the Multicast Scheduling Mechanisms for Interconnected WDM Optical Network”, IEEE GLOBECOM 2003 • Martin Maiser, Michael Scheutzow, and Martin Reisslein, “The Arrayed-Waveguide Grating-Based Single-Hop WDM Network: An Architecture for Efficient Multicasting”, Select Areas in Communications, IEEE Journal , November 2003 • Yu-Li Hsueh, Matthew S. Rogge, Wei-Tao Shaw, and Leonid G. Kazovsky, “SUCCESS-DWA: A Highly Scalable and Cost-Effective Optical Access Network”, IEEE Optical Communication August 2004 • Glen Kramer and Gerry Pesavento, “Ethernet Passive Optical Access Network (EPON): Building a Next-Generation Optical Access Network”, IEEE Communications Magazine February 2002