1

SidevõrgudIRT 4060/ IRT 0020

vooruloeng 12 / 1. dets 2004Sidekvaliteet

Avo Otstelekommunikatsiooni õppetool,

TTÜ raadio- ja sidetehnika inst.avo.ots@ttu.ee

2

NGNQoS High

ReliabilityNetwork

ManagementSecurity Intelligent

Networking

VoIP

E-Commerce

Multi-Media

Multi-casting

MobileAccess

ValueAdded

Services

VPN

•QoS and security for successful convergence

•Virtual Private Networks for converged networks and QoS

•Network management directories, policies and intelligent agents for decision support, configuration and QoS

3*Related Items

ATM IP

Speed High to Very High Low to Very High

ConnectionType

Connection-Oriented Connectionless-Oriented Subset of traffic will be connection-oriented (e.g.,

MPLS Explicit Route)

QoS Yes (4-5 Services) Emerging (e.g., DiffServ, IntServ)

PredominantDeployment

Core Networks Access Networks (Multi-service)

To desk top Internet, Corporate LANs Corporate networks emerging

TransmissionEfficiency

High for voice/video Low for data*

Low for voice/video High for data

TransmissionUnit

*Short, fixed-length packets (cells) Variable-length packets

DataApplications

Originally designed for real-timevoice

Evolving to all applications (e.g.,multimedia)

Originally designed for TCP, FTP, … less timecritical applications

Evolving to all applications (eg, multimedia)

Cost Economies of scale favor IP

ATM and IP

4

Voice vs data

TelecommunicationsTelecommunications Connections

Tightly Coupled

Centralized Controls

HW Fault Tolerance

Features At Call Set-Up

Obsession With QoS

Low Latency

Data CommunicationsData Communications Connectionless

Loosely Coupled

Loose Controls,Distributed

SW Fault Tolerance

Features During ‘Session’

Little Attention To QoS

High Latency

•Voice over IP•Virtual Private Networks•E-Commerce

•Video & audio streaming, conferencing…multi-media•Mobile Access

•QoS: DiffServ, MPLS, QoS-aware Switches•Multi-Protocol Support: ATM (CBR,VBR,UBR, ABR), IP, IP Over FR/ATM•Multicasting

•Manageability & Intelligent Networking:Policy Driven Nets•Security•High Reliability•Scalability

Common Infrastructure

Applications

5

CAC=Call/Connection Admission ControlDS=DiffServ Byte in IP Header

802.1p

802.1p

DS DS

802.1p

DS

CAC

CAC

CAC

“IP” Network

LEC

SS7

LEC

SS7

DSMedia

GatewayMedia

Gateway

SignalingGateway Signaling

Gateway

Media GWController

Media GWController

GateKeeper

GateKeeper

QoS Policy,Manager

VoIP Architecture

6

CoreNetwork

DataSource

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

MulticastCooperativeServer

MulticastGroup

MulticastGroup

MulticastGroup

MulticastCooperativeServer

CoreNetwork

DataSource

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

DataReceiver

Reduced Latency via•Reduced traffic on core network•Reduced load at data source server•Data closer to receivers

Obstacles to Overcome•Lack of unique set of protocols•Data synchronization•Reliability, Recovery from lost data

Multicasting

7

www.lucent.com

Client

www.cnnfn.com www.yahoo.com

L4RequestTrap

httpLoad Balance Requests

Router

PULL

Multicast

Request Reply

Request

CentralCache Control

CacheSites

8

Management (1)

Device Manager (NMS)

Data store

Network Device

Agent

NVRAMNetwork Device

Agent

NVRAM

SNMP

DeviceManager (2)

Data store

Network Device

Agent

NVRAM

9

Management (2)

Network DeviceNetwork Device

Radius

DNS/DHCP

Network Management

Network Device

Policy Administration

Policy Support Services

(VPN Designer)

PolicyDistribution

Network Device

Radius

DNS/DHCP

LDAP

Network Management

COPSTechnology

SpecificConfigurations

TechnologyPolicyServers

BusinessPolicyServersSNMP

10

Wireless Personal Area Network

Wireless Local Area Network

Wireless Interworking Technologies

Hand-overHand-over

Wireless Wide Area Network

11

Fikseeritud kvaliteeditingimused (SLA)

SLA 1 SLA 2

SLA 3 SLA 4

SLA 5 SLA 6

SLA 7

12

SLA areng

SLA

ReliabilityBlocking

DynamicSLA

ReliabilityBlockingLatency

JitterLoss

The PastThe Future

13

Policy Group

Policy Rule

Condition Action

QoS: Quality of ServiceCAC : Call Admission ControlSLA: Service Level AgreementResource Reservation (RSVP) [InServ]Differentiated Services:DiffServ

QoS is Delivered using SLA & Resource management techniquesA set of Rules are derived from the QoS Policy

SLACore

Schema

Core Schema

QoS MIB

DirectoryPDP Devices

SLA & QoS