network access architecture providing high quality ... · pdf filenetwork access architecture...

Network Access Architecture Providing High

Quality Business Education

Sok Hwan Cho (KAIM)

Sok Pal Cho (Sungkyul University)

84th International Conference 2012,Denver, Colorado, USA-29th

July to 3rd August 2012

Network Access Architecture I

Student

Learning Contents

Server

Teacher

Interface Circuit Switching

Packet Switching

Virtual Circuit

Virtual Circuit

Network

Provider

Terminal Service

Provider

The component of education on the cyberspace classifies greatly three parts those are

network provider, service provider, and terminal.

Network Provider

Network Provider (Circuit Switching Network, Packet Switching Network, etc.)

: Circuit switching network is for traditional telephone network, packet switching is

for internet network based on TCP/IP)

Network Access Architecture I

Application

in Internet

TCP

IP

• Quality issues of network architecture.

– Network performance

• Refer to the service quality of a computer communications

products- how well the network is performing under heavy

traffic loads.

• Fast deliver the contents to the user

• Broadband available, making every website load up much faster

• Greater throughput for fast connection

Throughput is the number of messages successfully delivered per unit time

Circuit Switching Network Node

Quality factors of circuit switching

are evaluated by a measure of the reject calls

- S/N ratio (Signal to Noise ratio)

- Echo by impedance mismatching

-H/W limitation

-etc.

Circuit

switching

network

Packet Switching(datagram) of Network Node

Switching at the network layer in the Internet is done using

the datagram approach to packet switching

Quality factors of packet switching network node Bit rate

QoS, Data throughput, Stability, Connection time, etc.

Content server to user(student/teacher)

Application Layer

MSS: Multiservice Switching System

MGC:Media Gateway Controller

Service Controller

MSS

Service Controller

MSS

Enterprise Service Network

SS7 based IN

STP

PSTN Local Exchange

Softswitch (MGC)

Trunk Gateway

Signaling Gateway

Trunk Gateway

Softswitch Internet

PBX

Wireless Network

Softswitch

Access Gateway

Packet Network ( IP based network)

ATM switch or IP/MPLS Router

Policy Management Servers

Service Gateway

Home Service

Car Service

Office Service

Education Service Provider

Broadcast Provider

ISP

Personal based Services

Video Location

Service Contents

Web IPTV

Integrated Service Framework

Office

Person(students/teacher

Mobile

Home Service

Home Service

Home Service

Education Contents Provider

Network service quality on network access architecture

Problem Reason

Availability Network availability

Slow start, channel change time Network performance

Picture freeze Network performance

Video/audio availability & quality Packet loss & jitter

Unobserved bandwidth Fast channel change

Video/audio synch. System configuration

• Throughput – The effective number of data flow transported within a

certain period of time.

– Specified as bandwidth in some situations.

– The bigger the throughput of the network, the better the

performance of the system is.

– In order to improve the resource efficiency, the throughput

of network should often be maximized.

• Dependant factors on network quality

– Speed (Throughput, Download, Data Quantity = Volume)

▪ Increase through put

▪ Reducing download time

▪ Real time process

MPEG-1: 1.544Mbps

MPEG-2 : 2.048Mbps Moving Image Real time.

High definition , High resolution Real time

Bit rates

Decimal prefixes (SI)

Name Symbol Multiple

kilobit per second kbit/s 103 10 to third power

megabit per second Mbit/s 106

gigabit per second Gbit/s 109

terabit per second Tbit/s 1012

.

16

“Jitter” between regions

75ms=Good 125ms=Med 225ms=Poor

Jitter varies with loading

RTT: Return To Time, Uses “ping” facility of TCP/IP

If Africa is connected with East Europe including Jitter, it delays 265ms.

• Phase 3

Contents Provider

Learning Objects

(Contents)

*1.Contents quality

Learning goal alignment

Feedback and adaptation

Motivation

Presentation design

*2.Interaction usability

Accessibility

Standards compliance

Lea

rnin

g O

bject E

valu

atio

n

*1. Contents quality I in Learning Object Evaluation

■ General evaluation standards of content quality

– Validity: clear , accurate contents, unbiased

– Potential effectiveness as a teaching-learning tool

– Ease of use

– Contents takes places always and everywhere and different context, not

only in classroom

– Contents is informal and non-formal, it could be taken place at home, at

workplace.

Physical factors of contents quality

Quality factors Contents

Content availability Availability of channel Related factors: content provider, multicast core, video source, access network, campus & home network

Content quality Quality of audio & video Related factors: multicast core, video source, access network, campus & home network

Channel change time Student and teacher wait time while changing channels Related factors: middleware, multicast core, UDP performance

Contents quality II

Ratings of contents quality evaluation[by LORI]

• Rating 1; serious inaccuracies, biases, omissions

• Rating 3: deemphasizing some key points in a way that could

mislead learners.

• Rating 5: emphasizing key points with sensitivity using an

appropriate level of detail.

*2. Interaction usability in Learning Object Evaluation

• Interaction usability

– Describes how easy or difficult it is for learners to move

around in a learning.

– Describes the ease of navigation, predictability of the user

interface, and the quality of the interface help features.

• Interaction on the network

– Student to student

– Student to content

– Faculty to student

– Faculty to content

• Interaction tools

– Discussion boards, Chat rooms, Mass emails to class members

– Streaming audio and/or video

– Instant messaging, Blogs , Wikis

Categories of Web documents

Static document

Delivered document to document, it caused data traffic heavy load on the network

channel. If you use markup language such as static document like

‘html’ for education web contents, it cause heavy load traffic.

Active document

If education web contents use active language like Java, delivering time is

fast and network channel traffic is too low. This is very fast speed.

Education Service Architecture

Learners

Satellite

Channel

Learner Channel

monitoring

Major issues to meet end-to-end QoS

Service Oriented Architecture

QoS Aware Communication Protocols

Resource Self-management

Supporting Tools

Email delivery

Browser architecture

• Classification of media use in multimedia systems

Integrated,

Digital System

Audio/Video

Applications

Desktop

Publishing

Hybrid

System

Video

server

Text

Editors

Type of

media

Number of media Integration of media

No Media

Integration

Full Media

Integration

n Media 1 Media

Time-independent

Time- dependent

Time-dependent

and time- independent

• Security Quality

– Security quality should meet fully data

protection compliant

– I&A procedure should meet the below security

quality

• Authentication quality

• Authorization quality

• Accounting quality

Key theme of NSP Control Plane: Identity Processing

Structural Frameworks

User Id: Earth-Korea- Man:LeeChaesub -19yy-mm-dd

- Certified by UN -

User ID Customer ID

student 1

student 2

student 3

student 4

Mobile Phone Nr

Fixed Phone Nr

WiFi WiBro Id

Cable/ IPTV Id

Internet Id

Service ID

Line ID

E.164 ID

MAC ID

ATM/Ethernet ID

IP Address

TCP/UDP Port ID

Session ID

Media ID

Provider ID

Content Owner ID

Comm. ID

Require AAA

I & A Procedure I&A Physical I&A

Password Biometrics H/W token

Face

recognition

I&A

Finger

Image

I&A

iras

Scan I&A

Magnetic

card

I&A

PKI

Smart

card

I&A

Keying

token

I&A

I&A must satisfy the quality of service. I&A is to recognize an individual and validate the

individual’s identity.

Symmetric-key cryptography

Create Error message

User (Learner/ Teacher) Interface Learning System

Check AAA

Check AAA

OK

Error

Error message Error message

Call Operation 1 Operation 1

Call Operation 2 Operation 2

Conclusion

Network Architecture providing total quality

Cro

ss-Dom

ain N

etwork

ing

Network

Application Service Servers

Service Control Server

Semantic

Transform

Contents

Transform Syndicator

Service Manager

Learner

Profile

Server

Execution

Engine

Loader

Service

Ensembler

Device

DB

Service

DBUser

DB

Session

DB

Windows/Linux

Web Browser

Learner

Profile

Client

Execution

Engine

Execution

Engine

Loader

PMP/PDA/Android/2G /3G/4G

Hand Set

GUI Client

Learner

Profile

Client

Execution

Engine

Execution

Engine

Loader

Platfo

rm

glu

e

Terminal Device Camera

Service VoD

Service Video

Phone

Service

…

AAA

Good contents Intelligent converged

MM terminal High speed &

Broadband network

Enhanced network architecture

• Competitive network: High speed/broadband network

improved efficiency and cost effectiveness) for business

learning practices.

Learner oriented contents (to establish between

teaching staff and students, better understanding and

greater learner satisfaction)

High quality web-based learning for students to

create screencasts directly from their browser and make the

video available online so that the viewers can stream video

directly.

Integrated business education service/providing

motivation to learner

Converged intelligent MM terminal

Cost-effectiveness (in realization, process and quality, etc.)

Continuous improvement