IT 351IT 351

Mobile &Wireless Computing

Semester 1, 2011-2012

Dr. Hala MokhtarHMOKHTAR@KSU.EDU.SARoom 51- 7th floor

Module OverviewModule Overview

Objectives:– To provide an introductory overview of the module and discuss the involved

concepts.

Course overviewCourse overview• This course will examine the area of mobile and wireless

networking, looking at the unique network protocol challenges and opportunities presented by wireless communication and host or router mobility. Although this course will touch on some of the important physical layer properties of radio and infrared communications, it will focus on network protocols above the physical layer, with an emphasis on the media access control, network and transport protocol layers.

• Aims:– To develop an understanding of the theory and practice of building

wireless and mobile networks.

– To provide an in-depth study of the requirements of wireless / mobile communications, including the development of standards for wireless networks.

– To examine current developments associated with wireless communications and mobile networks.

Learning OutcomesLearning Outcomes

• After completing the module you should be able to:1. Understand the main issues and challenges

associated with wireless radio communications --Physical layer.

2. Understand the structure of mobile computing architectures and differentiate between the different standards and practices (GSM, Wi-Fi,..) of wireless networks ---MAC & Physical Layers.

3. Describe and analyze the different internetworking challenges and solutions in wireless mobile networks--- Network and Transport Layers.

Assessment DetailsAssessment Details

• Minimum pass mark 60%.

– 30% Two Mid Exams• Mid_1: Saturday 29 October 2011

• Mid_2: Monday 12 December 2011

– 10% Lecture Quiz

– 20% Homework & Assignments

– 40% Final examDate: Sunday 15 January 2012

Recommended readingRecommended reading

• Text books:– Schiller, J. (2003) 'Mobile Communications', 2nd Edition,

Addison-Wesley (Pearson), 9780321123817 [Primary]– Stallings, W. (2005) 'Wireless Communications and Networks',

2nd Edition, Prentice Hall (Pearson), 9780131918351

• Course Notes • Copies of lecture slides along with other relevant material

will be available via wordpress blog:

http://it351.wordpress.com/

• Electronic resources • A large number of resources exist on the Internet. These

include book chapters, academic papers, FAQs, online workshops, programs and other relevant material from academic institutes around the world.

Outline SyllabusOutline Syllabus

• Introduction & History • Physical Layer: Wireless Radio Communications• MAC Layer & Architectures Overview

– Telecommunication Systems (GSM,UMTS)

– Satellite Systems

– Broadcast Systems

– Wireless LAN

– AdHoc – Bluetooth, and Wireless Applications

• Mobile Network Layer: IP and Addressing Issues• Mobile Transport Layer: TCP and Transport Issues• Application Layer

Module OverviewModule Overview - Terminology - Terminology

• Mobile (On the Move, Anywhere, Anytime)– Mobile computers do not have to be wirelessly connected,

e.g. a Laptop being plugged in to the university Ethernet network.

– Mobile computers must be able to change their point of attachment.

• Wireless (Connecting without Wires)– Wireless computers don’t have to be mobile, e.g. a wall

mounted sensor (CCTV Camera). Wireless computers are not connected to the network physically.

Module OverviewModule Overview - Terminology - Terminology

• Two aspects of mobility:– user mobility: users communicate (wireless) “anytime, anywhere, with

anyone”– device portability: devices can be connected anytime, anywhere to the

network

• Wireless vs. mobile Examples stationary computer notebook in a hotel wireless LANs in historic buildings Personal Digital Assistant (PDA)

• The demand for mobile communication creates the need for integration of wireless networks into existing fixed networks:– local area networks: standardization of IEEE 802.11– Internet: Mobile IP extension of the internet protocol IP– wide area networks: e.g., internetworking of GSM and ISDN, VoIP over

WLAN and POTS

Module Overview - TerminologyModule Overview - Terminology

• Wireless Applications– Networked applications based on

nodes that use wireless communications to share information with other wireless nodes or with a wireless network infrastructure.

• Wireless Architecture– The components of a network

system that together make up an infrastructure to support wireless nodes, including the software and hardware of nodes, access points, routers, etc.

Distribution System

BSS1

BSS2 BSS3

BSS4

IBSS

ESS

Distribution System

BSS1

BSS2 BSS3

BSS4

IBSS

ESS

Module Overview –Wireless & Mobility Module Overview –Wireless & Mobility ChallengesChallenges

• Low & variable bandwidth• Severe power restrictions• Storage and interface constraints• Security and data risks• Address migration• Location dependant information• Heterogeneity• .• .• And many others…

Module OverviewModule Overview - Issues - Issues

• Communications

– OSI Layers 1 and 2 (Physical & Data Link)

– The ‘enabler’ of wireless to provide networking

– Features include:

• Managing the ‘air’ interface

• Low level access controls

• Power and energy control

– Spectrum management

– Medium access protocols

Module OverviewModule Overview - Architectures - Architectures

• Architectures– Fixed-Wireless

• Main component is Fixed network• Wireless ‘at the edge’• E.g. Wireless LAN

– Cellular• Special case of Fixed-Wireless• Large scale WAN, network is partitioned into cells• E.g. GSM

– Ad-Hoc• No infrastructure or central control unit• Bluetooth networks, sensor networks

Module OverviewModule Overview - Issues - Issues

• Internetworking– OSI Layers 3 and 4 (Network & Transport)

– The ‘glue’ binding wireless links to apps.

– Features include:• Global Addressing scheme• End-to-End routing scheme• Congestion and Flow control• Security• Quality of Service (QoS)• Ad Hoc network control

Module OverviewModule Overview - Applications - Applications

• Applications of Wireless– Same as fixed networks

• Web browsing, file sharing, etc.

– Outdoors and on-the-move computing• Laptop on the train, WAP on mobile phone etc.

– Location-based services• City guides, context shopping, GPS etc.

– Pervasive and Ubiquitous Computing• Networked Appliances, Sensor Networks, Smart Spaces