Suresh - Project Review

8/8/2019 Suresh - Project Review

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U N D E R T H E G U I D A N C E O F

M R . R . S H A N K A R

P R O J E C T M E M B E R S :

K . S U R E S H

E . K A L A I S E L VA N

R . P R A S A N N A V E N K AT E S H

S . P R E M K U M A R

A Novel Bandwidth Allocation Scheme

for Enhancing QOS in IntegratedEPON WiMAX



Contents

y Introductiony Supporting VPNs Over EPON-WiMAXy Network Modely System Modely QoS Mappingy VPN-Based QoS Provisioningy VPN-Based Admission Control Admission Controlyy VPN VPN--based Dynamic Bandwidth Allocation based Dynamic Bandwidth Allocation



Introduction

Integration of EPON WiMAX has been presented as anattractive broadband access network (BAN)

EPON and WiMAX perfectly match interms of capacityhierarchies.

Integration can take advantages of the bandwidth benefit of fiber communications and non line of sight (NLOS) featuresof wireless communications.

Integration enables integrated resource allocation & packetscheduling that help better support the emerging QoS and Toimprove network throughput.



Continued«.

y EPON-WiMAX integration can help realize Fixedmobile convergence (FM C) by supporting mobility inthe broad band access.

y EPON WiMAX integration has been well reportedin past few years. But VPNs directly on thisintegration has been never investigated .

y The project provides per-stream quality of serviceprotection & bandwidth guarantee for real timeflows.



Supporting VPNs Over EPON-WiMAX

y VPNs over EPON-WiMAX could be deployed to sup-port mission-critical (police, health care, ¿re-¿ghting ).

y Governmental or corporate systems in order toachieve a secure high-speed and ef¿cient wirelessconnectivity in rural and urban areas.

y Building up layer 2 VPNs is most suitable when anEPON-WiMAX .



Continued«

y VPN supports the premium services with customdesign control, diverse QoS requirement andsecurity assurances.

y Above services provided by layer 2 MA C protocols.Such VPNs are referred to layer 2 VPN.

y So project investigates the realization of layer 2 VPNsover EPON-WiMAX



Network model



System Model

EPON supports the differentiated services , where asWiMAX supports the Integrated services. So WiMAXprovides finer bandwidth than EPON

If we launch IEEE 802.16 MAC PDUs in optical domainthen the whole integrated system will support integratedservices and can be controlled by connection orientedbandwidth management protocols.

No control frames will then be required in Ethernet framefor bandwidth allocation & network control in opticaldomain.



QoS Mapping

IEEE 802.16 standard defines five classes of services

1.UGS 2.rtps 3.nrtps 4.ertps 5.BE

There are three classes of services supported in an EPON

1.Expedited forwarding (EF) for CBR(const bit rate) traffic

2.Assured forwarding(AF) for VBR(variable bitrate) traffic

3.BE

To simplify the bandwidth allocation operation one to onemapping between CoS queues in Base station ones inONUs.

Hence we have a total of five queues for UGS,rtPS,nrtPS,ertPS,BE classes of services



VPN-Based QoS Provisioning



Traffic characteristics & QoS requirements

CBR traffic such as UGS is nonbursty and can be simplycharacteristized by its mean rate (u) in bps.

VBR traffic (such as rtPS & nrtPS) is bursty in nature and is

characterized by 1.Peak arrival data rate,2.maximum burstsize,3.delay bound,4.MAC Service DataUnit(Maximum&Minimum).

For fixed frame size, BE traffic is bursty and request neither

delay requirement or bandwidth gaurantes.For VBR traffic, the AC may be admit real stream either its

peak rate or mean rate.



Continued«

y For CBR traffic flow admitted in mean date ratesupported in the current system.

y Our proposed frame work define a suit of new traffic parameters is dual token bucket model fortraffic regulation .

y For mutiple ONU-BSs the A C needs to considernetwork architecture and subscriber stationdistribution.



VPN-Based Admission Control Admission Control

y Our proposed three stage admission controlmechanism for real time flows.

y SS based admission control.y ONU-BS based admission control.y OLT based admission control.y The three stage A C scheme is used to achieve end to

end bandwidth guarantee for each admitted flow.



VPN VPN--based Dynamic Bandwidth Allocation based Dynamic Bandwidth Allocation

y The proposed VPN-VBA is installed at both OLT andONU-BS, in order to arbitrate the transmission of ONU-BS and SS over the shared upstream an uplink

channels.y The allocated time share is achieved the desired

bandwidth guarantee.y The size of each sub cycle should be determined in

each polling in interval to adapt bandwidth requestof each flow.

y The proposed A C scheme differentiates SS with realtime flow from the BE flows.



Continued ..

y The inverse of the transmission rate is used torequires more time share to transmit on admittedflow rate.

y Our scheme estimates the amount of bandwidth tosatisfy each admitted flow in each frame.

y The computation of VPN-DBA at the OLT is done inthe same fashion with the same transmission rate forall ONU-BSs.

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