Wireless Security Background

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Wireless Security Background"

Transcription

1 Wireless Security Background

2 Wireless Networks The need for mobile computing Laptops, PDAs, Bluetooth devices Smart phones Enabling technology Wireless communication Two important characteristics Wireless links unreliable, vulnerable Mobility introduces new networking challenges 2

3 Wireless Networks Three elements End-point devices Laptop, PDA, smartphones, RFID tags Maybe stationary or mobile Usually power constrained Wireless infrastructure Base stations, e.g., wireless routers, access point Usually connected to wired network, e.g., Internet Relay packets between wireless devices and wired networks Wireless links Communication channel data rate varies transmission distance varies 3

4 Selected Wireless Standards n Data rate (Mbps) a,g b a,g point-to-point (WiMAX) UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO UMTS/WCDMA, CDMA2000 3G data 3G cellular enhanced.056 IS-95, CDMA, GSM 2G Indoor 10-30m Outdoor m Mid-range outdoor 200m 4 Km Long-range outdoor 5Km 20 Km 4

5 Organization Infrastructure mode Base stations bridge user devices and wired networks User devices moves around and access wired network through different base stations Infrastructure-less, ad-hoc mode No base stations Can only communicate with devices within the covered area Devices are self-organized into a network E.g., routing packets between user devices single-hop v.s. multi-hop 5

6 Characteristics of Wireless Link Limited signal strength Also decrease with distance Interference from other sources Noise, collision with other signals Multipath propagation signal reflects off objects As a result, in wireless networks, links are Often short range, unreliable, highly lossy Energy v.s. link quality 6

7 Signal Collision A X C A B C B Hidden terminal problem A, B can hear each other B, C can hear each other but A, C cannot hear each other, and thus are unaware of each other Signal Interfering A, B can hear each other B, C can hear each other but A, C cannot hear each other and thus interfere at B 7

8 IEEE Wireless LAN b, a,802.11g,802.11n operate at different data rates all use CSMA/CA for multiple access Sense before transmitting / collision avoidance no collision detection all have base-station and ad-hoc modes Basic architecture Base stations + wireless hosts wireless hosts only (ad-hoc mode) 8

9 Personal Area Network Cover small area - 10m diameter Wireless keyboard, mouse, headphone Master/slaves architecture slaves send requests to master master grant access Evolved from Bluetooth specification 9

10 802.16: WiMAX Like but longer range (~6 miles) city rather than a single room date rate: ~ 14Mbps Basic architecture Base stations + wireless hosts 10

11 Cellular Network Architecture Consists of base station mobile users wireless link Mobile switching center connect cell to telephone network / internet manage call setup handle mobility Public telephone network / Internet 11

12 Cellular Communication Mobile-to-BS radio spectrum is shared Two techniques to mediate the access Combined FDMA/TDMA FDMA: frequency division multiple access TDMA: time division multiple access CDMA: code division multiple access Standards 2G (voice channels): GSM 2.5G (voice/data channels): GPRS, CDMA-2000 (phase 1) 3G (voice/data channels): CDMA

13 Wireless Mesh Networks Provide high-coverage, in expensive Internet service Architecture One wireless hot spot (WHS): connect WMN to Internet Mobile stations Several transit access points: connect mobile stations to WHS Single connection point to Internet Lower cost than WiFi networks 13

14 Mobile Ad-hoc Networks Formed in an ad-hoc manner Users are often mobile No infrastructure support Communicate through wireless link Limited energy at user device User devices also act as routers Often created for a specific purpose Military applications, battlefield network 14

15 Vehicular Ad-hoc Network Created for assisting drivers Offer real-time nearby traffic information e.g., alerting drivers about accidents Based on the computing and communication platforms installed on each vehicle Information are exchanged through individual vehicles, and road-side units 15

16 Sensor Networks To interacts with physical environments e.g., monitor volcano activity, battle field surveillance Operation in harsh environments Consists of A large number of small, low-cost sensor nodes Sense the environment, collect and report findings Also forward data packets for others Form a network of small sensors A few base stations Store data, connect to wired networks 16

17 RFID Identifying and tracking items An RFID system has RFID tags RFID readers Back-end database RFID tag microchip + antenna very limited memory and computing power can active (battery powered) or passive (harness energy from reader s signal) 17

18 Common challenges Wireless link lossy, unreliable, open Mobility Limited energy Limited computing capability 18

19 Mobility No mobility Users access network via the same AP Stationary wireless sensor networks Some mobility Mobile users moves around and access the network via different APs Mobile sensor networks Sensors are mobile -> routing re-construction High mobility Mobile users maintain uninterrupted network access passing many APs (cell phone) 19

20 Terms Home network Home agent Perform mobility support Permanent address Visited network Foreign agent Perform mobility support Could be done by the mobile itself Care-of-address 20

21 How to Find a Mobile Friend? Search all phone books? Call her/his parents? Check her/his website or facebook profile Expect her/him to let you know where she/he is? 21

22 Approaches to Handle Mobility Let routers handle it Routers propagate the permanent address Routing table includes where each mobile user is located No change on the end-systems Problem: not scalable Let end-systems handle it Direct routing get the address of FA and send messages to directly Indirect routing communication via home agent and foreign agent Registration needed (home agent need to know where is the mobile) 22

23 Indirect Routing Triangle routing Correspondent send messages to home address Home agent receives packets, find the visited network, and forward them to the foreign agent Foreign agent receives packets and forward them to mobile Mobile replies to correspondent directly Could be very inefficient due to the triangle 23

24 Moving between Networks Suppose user changes network again registers with the new foreign agent new foreign agent registers with home agent home agent update the care-of-address This is done transparently Correspondent does t need to know the change Maintain uninterrupted communication 24

25 Direct Routing Correspondent gets the address of FA And then forwards packets to FA FA forward packets to mobile Mobile replies directly to correspondent Benefit: overcome triangle routing problem Not transparent to the correspondent since she has to know the care-of-address What if mobile changes network again? Let the first FA (anchor FA) handle the change i.e., you always contact the anchor FA to send messages 25

26 Mobile IP (RFC 3344) Very similar to what we have discussed Three major components indirect routing agent discovery home/foreign agent broadcast ICMP messages registration with home agent 26

27 Handle Mobility in Cellular Networks Home network (e.g., T-mobile, AT&T) Home location register (HLR): database containing permanent user profile and current user location Visited network Visitor location register (VLR): database containing users currently in the network Could be home network 27

28 Indirect Routing in GSM home MSC consults HLR, gets roaming number of mobile in visited network mobile user HLR 4 2 home network home Mobile Switching Center VLR Mobile Switching Center visited network 3 correspondent 1 call routed to home network Public switched telephone network home MSC sets up 2 nd leg of call to MSC in visited network MSC in visited network completes call through base station to mobile 28

29 Handoff with Common MSC! Handoff goal: route call via new base station (without interruption) old BSS VLR old routing Mobile Switching Center new routing new BSS! reasons for handoff: " stronger signal to/from new BSS (continuing connectivity, less battery drain) " load balance: free up channel in current BSS " GSM doesn t mandate why to perform handoff (policy), only how (mechanism)! handoff initiated by old BSS 29

30 Handoff with Common MSC 1. old BSS informs MSC of impending handoff, provides list of 1+ new BSSs 2. MSC sets up path (allocates resources) to new BSS old BSS 1 VLR 8 Mobile Switching Center new BSS 3. new BSS allocates radio channel for use by mobile 4. new BSS signals MSC, old BSS: ready 5. old BSS tells mobile: perform handoff to new BSS 6. mobile, new BSS signal to activate new channel 7. mobile signals via new BSS to MSC: handoff complete. MSC reroutes call 8 MSC-old-BSS resources released 30

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach Chapter 7 Wireless and Mobile Networks Computer Networking: A Top Down Approach 7 th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016 7-1 Background: # wireless (mobile) phone subscribers

More information

Mobility: vocabulary

Mobility: vocabulary What is mobility? spectrum of mobility, from the perspective: no mobility high mobility mobile wireless user, using same access point mobile user, connecting/ disconnecting from using DHCP. mobile user,

More information

CSC 4900 Computer Networks: Mobility

CSC 4900 Computer Networks: Mobility CSC 4900 Computer Networks: Mobility Professor Henry Carter Fall 2017 Last Time What is the hidden terminal problem? How do CDMA networks use spectrum differently than TDMA systems? What is a chipping

More information

CSC 8560 Computer Networks: Wireless and Mobility

CSC 8560 Computer Networks: Wireless and Mobility CSC 8560 Computer Networks: Wireless and Mobility Professor Henry Carter Fall 2017 Chapter 7: Wireless and Mobile Networks Background: # wireless (mobile) phone subscribers now exceeds # wired phone subscribers!

More information

No lecture on Thurs. Last homework will be out this week (not due, covers wireless) Extra office hours for next week and the week after.

No lecture on Thurs. Last homework will be out this week (not due, covers wireless) Extra office hours for next week and the week after. Administrivia No lecture on Thurs. Last homework will be out this week (not due, covers wireless) Extra office hours for next week and the week after. 1 CSMA/CA: Recap Sensing in wireless medium is limited

More information

CSC 401 Data and Computer Communications Networks

CSC 401 Data and Computer Communications Networks CSC 401 Data and Computer Communications Networks Wireless Networks Cellular & Mobility Sec 7.4 7.8 Lina Battestilli 7.1 Introduction Wireless Chapter 7 Outline Wireless and Mobile Networks 7.2 Wireless

More information

ECE 4450:427/527 - Computer Networks Spring 2017

ECE 4450:427/527 - Computer Networks Spring 2017 ECE 4450:427/527 - Computer Networks Spring 2017 Dr. Nghi Tran Department of Electrical & Computer Engineering Lecture 5.6: Wireless Networks - MAC Dr. Nghi Tran (ECE-University of Akron) ECE 4450:427/527

More information

CSCI-1680 Wireless Chen Avin

CSCI-1680 Wireless Chen Avin CSCI-1680 Wireless Chen Avin Based on slides from Computer Networking: A Top Down Approach - 6th edition Administrivia TCP is due on Friday Final Project is out (fun, two weeks) Wireless and Mobile Networks

More information

Data Communication & Networks G Session 5 - Main Theme Wireless Networks. Dr. Jean-Claude Franchitti

Data Communication & Networks G Session 5 - Main Theme Wireless Networks. Dr. Jean-Claude Franchitti Data Communication & Networks G22.2262-001 Session 5 - Main Theme Wireless Networks Dr. Jean-Claude Franchitti New York University Computer Science Department Courant Institute of Mathematical Sciences

More information

Module 6: Wireless Mobile Networks

Module 6: Wireless Mobile Networks Module 6: Wireless Mobile Networks SMD123 Computer Communications Kaustubh Phanse Department of Computer Science and Electrical Engineering Luleå University of Technology Lecture Objectives Wireless links

More information

Mobile and Sensor Systems

Mobile and Sensor Systems Mobile and Sensor Systems Lecture 2: Mobile Medium Access Control Protocols and Wireless Systems Dr Cecilia Mascolo In this lecture We will describe medium access control protocols and wireless systems

More information

CSC 4900 Computer Networks: Wireless Networks

CSC 4900 Computer Networks: Wireless Networks CSC 4900 Computer Networks: Wireless Networks Professor Henry Carter Fall 2017 Last Time Mobile applications are taking off! What about current platforms is fueling this? How are an application s permission

More information

CPSC 826 Internetworking. Wireless and Mobile Networks. Wireless Networks Wireless Hosts

CPSC 826 Internetworking. Wireless and Mobile Networks. Wireless Networks Wireless Hosts 1 CPSC 826 Intering Wireless and Mobile Networks Michele Weigle Department of Computer Science Clemson University mweigle@cs.clemson.edu November 29, 200 Wireless and Mobile Networks Background Number

More information

Chapter 5 Wireless and Mobile Networks

Chapter 5 Wireless and Mobile Networks Chapter 5 Wireless and Mobile Networks Reference: Computer Networking: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007. Wireless and Mobile Networks Chapter 5: Wireless

More information

Wireless and Mobile Networks 7-2

Wireless and Mobile Networks 7-2 Wireless and Mobile Networks EECS3214 2018-03-26 7-1 Ch. 6: Wireless and Mobile Networks Background: # wireless (mobile) phone subscribers now exceeds # wired phone subscribers (5-to-1)! # wireless Internet-connected

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

CS 332 Computer Networks Wireless Networks

CS 332 Computer Networks Wireless Networks CS 332 Computer Networks Wireless Networks Professor Szajda Chapter 6: Wireless and Mobile Networks Background: # wireless (mobile) phone subscribers now exceeds # wired phone subscribers! computer nets:

More information

Wireless and Mobile Networks Reading: Sections 2.8 and 4.2.5

Wireless and Mobile Networks Reading: Sections 2.8 and 4.2.5 Wireless and Mobile Networks Reading: Sections 2.8 and 4.2.5 Acknowledgments: Lecture slides are from Computer networks course thought by Jennifer Rexford at Princeton University. When slides are obtained

More information

Wireless and Mobile Networks

Wireless and Mobile Networks Wireless and Mobile Networks Background: # wireless (mobile) phone subscribers now exceeds # wired phone subscribers (5-to-1)! # wireless Internet-connected devices equals # wireline Internet-connected

More information

Mohammad Hossein Manshaei 1393

Mohammad Hossein Manshaei 1393 Mohammad Hossein Manshaei manshaei@gmail.com 1393 Wireless Links, WiFi, Cellular Internet Access, and Mobility Slides derived from those available on the Web site of the book Computer Networking, by Kurose

More information

Topic 2b Wireless MAC. Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach

Topic 2b Wireless MAC. Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach Topic 2b Wireless MAC Chapter 7 Wireless and Mobile Networks Computer Networking: A Top Down Approach 7 th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016 7-1 Ch. 7: Background: # wireless

More information

6.9 Summary. 11/20/2013 Wireless and Mobile Networks (SSL) 6-1. Characteristics of selected wireless link standards a, g point-to-point

6.9 Summary. 11/20/2013 Wireless and Mobile Networks (SSL) 6-1. Characteristics of selected wireless link standards a, g point-to-point Chapter 6 outline 6.1 Introduction Wireless 6.2 Wireless links, characteristics CDMA 6.3 IEEE 802.11 wireless LANs ( wi-fi ) 6.4 Cellular Internet Access architecture standards (e.g., GSM) Mobility 6.5

More information

Last Lecture: Data Link Layer

Last Lecture: Data Link Layer Last Lecture: Data Link Layer 1. Design goals and issues 2. (More on) Error Control and Detection 3. Multiple Access Control (MAC) 4. Ethernet, LAN Addresses and ARP 5. Hubs, Bridges, Switches 6. Wireless

More information

Wireless Networks. CSE 3461: Introduction to Computer Networking Reading: , Kurose and Ross

Wireless Networks. CSE 3461: Introduction to Computer Networking Reading: , Kurose and Ross Wireless Networks CSE 3461: Introduction to Computer Networking Reading: 6.1 6.3, Kurose and Ross 1 Wireless Networks Background: Number of wireless (mobile) phone subscribers now exceeds number of wired

More information

Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ

Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ Computer Networks 1 (Mạng Máy Tính 1) Lectured by: Dr. Phạm Trần Vũ Chapter 6 Wireless and Mobile Networks Computer Networking: A Top Down Approach, 5 th edition. Jim Kurose, Keith Ross Addison-Wesley,

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations;

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see the animations;

More information

Wireless and Mobile Networks

Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

Chapter 6 Wireless and Mobile Networks. Chapter 6 outline. Chapter 6: Wireless and Mobile Networks. Elements of a wireless network

Chapter 6 Wireless and Mobile Networks. Chapter 6 outline. Chapter 6: Wireless and Mobile Networks. Elements of a wireless network Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

Cellular Networks and Mobility

Cellular Networks and Mobility Cellular Networks and Mobility Daniel Zappala CS 460 Computer Networking Brigham Young University Cellular Networks GSM 2G/3G Architecture 3/20 2G Standard 4/20 GSM: combined FDM/TDM divide into 200 khz

More information

Chapter 6. Wireless and Mobile Networks. IEEE : personal area network : WiMAX: downlink, uplink scheduling

Chapter 6. Wireless and Mobile Networks. IEEE : personal area network : WiMAX: downlink, uplink scheduling Chapter 6 Wireless and Networks Part II IEEE 802.15: personal area less than 10 m diameter replacement for cables (mouse, keyboard, headphones) ad hoc: no infrastructure master/slaves: slaves request permission

More information

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach. Andrei Gurtov

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach. Andrei Gurtov Chapter 7 Wireless and Mobile Networks Andrei Gurtov All material copyright 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved Computer Networking: A Top Down Approach 7 th edition Jim Kurose, Keith

More information

COMP 3331/9331: Computer Networks and Applications

COMP 3331/9331: Computer Networks and Applications COMP 3331/9331: Computer Networks and Applications Week 10 Reading Guide: Chapter 6: 6.1 6.4 1 Ch. 6: Wireless and Mobile Networks Background: v # wireless (mobile) phone subscribers now exceeds # wired

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you can add,

More information

COMP 3331/9331: Computer Networks and Applications

COMP 3331/9331: Computer Networks and Applications COMP 3331/9331: Computer Networks and Applications Week 10 Wireless Networks Reading Guide: Chapter 6: 6.1 6.3 Wireless Networks + Security 1 Wireless and Mobile Networks Background: # wireless (mobile)

More information

Lecture 15 Wireless and Mobility

Lecture 15 Wireless and Mobility Lecture 15 Wireless and Mobility From Kurose & Ross Book slightly modified by Romaric Duvignau duvignau@chalmers.se Thanks and enjoy! JFK/KWR All material copyright 1996-2016 J.F Kurose and K.W. Ross,

More information

Already finished all layers in the stack, why a separate chapter for wireless and mobile networks?

Already finished all layers in the stack, why a separate chapter for wireless and mobile networks? Wireless and Mobile Networks Yanmin Zhu Department of Computer Science and Engineering Mobile lobal ISP Home Regional ISP Institutional Already finished all layers in the stack, why a separate chapter

More information

Wireless and WiFi. Daniel Zappala. CS 460 Computer Networking Brigham Young University

Wireless and WiFi. Daniel Zappala. CS 460 Computer Networking Brigham Young University Wireless and WiFi Daniel Zappala CS 460 Computer Networking Brigham Young University Wireless Networks 2/28 mobile phone subscribers now outnumber wired phone subscribers similar trend likely with Internet

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks Computer Networking: A Top Down Approach Featuring the Internet, 3 rd edition. Jim Kurose, Keith Ross Addison-Wesley, July 2004. 6: Wireless and Mobile Networks 6

More information

Input ports, switching fabric, output ports Switching via memory, bus, crossbar Queueing, head-of-line blocking

Input ports, switching fabric, output ports Switching via memory, bus, crossbar Queueing, head-of-line blocking Last time Router internals Input ports, switching fabric, output ports Switching via memory, bus, crossbar Queueing, head-of-line blocking Mobility Home, visited s Home, foreign agents Permanent, care-of

More information

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach Chapter 7 Wireless and Mobile Networks A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see

More information

Chapter 3: Wireless and Mobile Networks

Chapter 3: Wireless and Mobile Networks Computer Network Architectures and Multimedia Guy Leduc Chapter 3 Wireless and Mobile Networks Chapter 7 of Computer Networking: A Top Down Approach, 7 th edition. Jim Kurose, Keith Ross Addison-Wesley,

More information

Computer Networks. Wireless and Mobile Networks. László Böszörményi Computer Networks Mobile - 1

Computer Networks. Wireless and Mobile Networks. László Böszörményi Computer Networks Mobile - 1 Computer Networks Wireless and Mobile Networks László Böszörményi Computer Networks Mobile - 1 Background Number of wireless (mobile) phone subscribers now exceeds number of wired phone subscribers! Computer

More information

Chapter 7. Wireless and Mobile Networks 7-1

Chapter 7. Wireless and Mobile Networks 7-1 Chapter 7 Wireless and Mobile Networks A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see

More information

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach

Chapter 7. Wireless and Mobile Networks. Computer Networking: A Top Down Approach Chapter 7 Wireless and Mobile Networks A note on the use of these Powerpoint slides: We re making these slides freely available to all (faculty, students, readers). They re in PowerPoint form so you see

More information

Chapter 6 Wireless and Mobile Networks

Chapter 6 Wireless and Mobile Networks Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: The notes used in this course are substantially based on powerpoint slides developed and copyrighted by J.F. Kurose and K.W.

More information

Chapter 6 Wireless and Mobile Networks (Wireless and Mobility)

Chapter 6 Wireless and Mobile Networks (Wireless and Mobility) CSF645 Mobile Computing 行動計算 Chapter 6 Wireless and Mobile Networks (Wireless and Mobility) Computer Networking: A Top Down Approach 6 th edition, Jim Kurose, Keith Ross 吳俊興國立高雄大學資訊工程學系 outline 6.1 Introduction

More information

Wireless Networks. CSE 3461: Introduction to Computer Networking Reading: , Kurose and Ross ( 6th ed.); , Kurose and Ross (7th ed.

Wireless Networks. CSE 3461: Introduction to Computer Networking Reading: , Kurose and Ross ( 6th ed.); , Kurose and Ross (7th ed. Wireless Networks CSE 3461: Introduction to Computer Networking Reading: 6.1 6.3, Kurose and Ross ( 6th ed.); 7.1 7.3, Kurose and Ross (7th ed.) 1 Questions How do you use wireless network technology in

More information

3/20/2012. Data Communications & Networks. Session 5 Main Theme. 2 Wireless and Mobile Networks. Dr. Jean-Claude Franchitti

3/20/2012. Data Communications & Networks. Session 5 Main Theme. 2 Wireless and Mobile Networks. Dr. Jean-Claude Franchitti Data Communications & Networks Session 5 Main Theme Wireless and Mobile Networks Dr. Jean-Claude Franchitti New York University Computer Science Department Courant Institute of Mathematical Sciences Adapted

More information

Shared Access Networks Wireless. 1/27/14 CS mywireless 1

Shared Access Networks Wireless. 1/27/14 CS mywireless 1 Shared Access Networks Wireless 1 Wireless and Mobile Networks Background: # wireless (mobile) phone subscribers now exceeds # wired phone subscribers (5-to-1)! # wireless Internet-connected devices equals

More information

Medium Access Control

Medium Access Control Medium Access Control All material copyright 1996-2009 J.F Kurose and K.W. Ross, All Rights Reserved 5: DataLink Layer 5-1 Link Layer Introduction and services Multiple access protocols Ethernet Wireless

More information

Communication Networks: Wireless and Mobile Communication Networks. Prof. Amir Herzberg BIU, Dept. of CS

Communication Networks: Wireless and Mobile Communication Networks. Prof. Amir Herzberg BIU, Dept. of CS 89-850 Communication Networks: Wireless and Mobile Communication Networks Prof. Amir Herzberg BIU, Dept. of CS From ch.6 of Kurose and Ross, 3 rd edition; and [KMK], ch. 8. All material copyright 1996-2004

More information

Elements of a wireless network. Elements of a wireless network. Characteristics of selected wireless link standards. Elements of a wireless network

Elements of a wireless network. Elements of a wireless network. Characteristics of selected wireless link standards. Elements of a wireless network wireless hosts laptop, D, I phone run applications may be stationary (non-mobile) or mobile wireless does not always mean mobility base station typically connected to wired relay - responsible for sending

More information

Home Area Networks. Outline

Home Area Networks. Outline Home Area Networks CS 687 University of Kentucky Fall 2015 Acknowledgment: Some slides are adapted from the slides distributed with the book Computer Networking: A Top Down Approach, 5th edition. Jim Kurose,

More information

COSC : mobility within same subnet. Lecture 26. H1 remains in same IP subnet: IP address can remain same

COSC : mobility within same subnet. Lecture 26. H1 remains in same IP subnet: IP address can remain same Lecture 26 802.11: mobility within same subnet H1 remains in same IP subnet: IP address can remain same switch: which AP is associated with H1? self learning (Ch. 5): switch will see frame from H1 and

More information

Announcements: ECE/CS 372 introduction to computer networks. Assign 4 is due this Thursday Lab 4 is due next Tuesday Assignment 5 posted soon

Announcements: ECE/CS 372 introduction to computer networks. Assign 4 is due this Thursday Lab 4 is due next Tuesday Assignment 5 posted soon ECE/CS 372 introduction to computer networks Lecture 14 Announcements: Assign 4 is due this Thursday Lab 4 is due next Tuesday Assignment 5 posted soon Credit for lecture slides to Professor Bechir Hamdaoui

More information

Reti degli elaboratori

Reti degli elaboratori Reti degli elaboratori Dealing with Mobility; Bluetooth Basics Chiara Petrioli petrioli@di.uniroma1.it What is mobility? v spectrum of mobility, from the network perspective: no mobility high mobility

More information

Elements of a wireless network. Elements of a wireless network. Some wireless link standards. Elements of a wireless network

Elements of a wireless network. Elements of a wireless network. Some wireless link standards. Elements of a wireless network Elements of a wireless Elements of a wireless wireless hosts laptop, D, I phone run applications may be stationary (non-mobile) or mobile wireless does not always mean mobility base station typically connected

More information

Mobile devices for wireless

Mobile devices for wireless Mobile devices for wireless Wireless sensors Limited proc. power Small battery Laptop functionally eq. to desktop standard applications TDTS04/09 Föreläsning 0/6: WLAN och TCP i trådlösa nät RFID tag A

More information

Wireless and Mobile Networks

Wireless and Mobile Networks Wireless and Mobile Networks Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@wustl.edu Audio/Video recordings of this lecture are available on-line at: http://www.cse.wustl.edu/~jain/cse473-11/

More information

Wireless Network and Mobility

Wireless Network and Mobility Wireless Network and Mobility Dept. of Computer Science, University of Rochester 2008-11-17 CSC 257/457 - Fall 2008 1 Wireless Networks and Mobility Wireless networking in the data link layer Short range:

More information

Announcements: ECE/CS 372 introduction to computer networks. Assignment 4 due now. Chapter 7

Announcements: ECE/CS 372 introduction to computer networks. Assignment 4 due now. Chapter 7 ECE/CS 372 introduction to computer networks Announcements: Assignment 4 due now Chapter 7 Acknowledgement: slides drawn heavily from Kurose & Ross and Prof. Bechir Hamdaoui Chapter 7, slide 1 Wireless

More information

CEN 538 Wireless LAN & MAN Networks

CEN 538 Wireless LAN & MAN Networks King Saud University College of Computer and Information Sciences Department of Computer Engineering CEN 538 Wireless LAN & MAN Networks Dr. Ridha OUNI rouni@ksu.edu.sa LMS web site References Text book

More information

Chapter 6 Wireless and Mobile Networks. Chapter 6 outline. Chapter 6: Wireless and Mobile Networks. Elements of a wireless network.

Chapter 6 Wireless and Mobile Networks. Chapter 6 outline. Chapter 6: Wireless and Mobile Networks. Elements of a wireless network. Chapter 6 Wireless and obile Networks Computer Networking: A Top Down Approach Featuring the Internet, 3 rd edition. Jim Kurose, Keith Ross Addison-Wesley, July 2004. Chapter 6: Wireless and obile Networks

More information

Introduction to Wireless Networks

Introduction to Wireless Networks Introduction to Wireless Networks Wireless devices are everywhere Mobile computers (laptops, netbooks, tablets, handheld PCs, PDAs,...) Mobile phones (incl. smartphones) Wireless headsets, keyboards, mice,

More information

Bluetooth. 3.3 Latest Technology in Wireless Network. What is BLUETOOTH: Bluetooth 2/17/2016

Bluetooth. 3.3 Latest Technology in Wireless Network. What is BLUETOOTH: Bluetooth 2/17/2016 3.3 Latest Technology in Wireless Network Bluetooth Bluetooth Bluetooth is a high-speed, low-power microwave wireless link technology, designed to connect phones, laptops, PDAs and other portable equipment

More information

MULTIPLE ACCESS PROTOCOLS 2. 1

MULTIPLE ACCESS PROTOCOLS 2. 1 MULTIPLE ACCESS PROTOCOLS AND WIFI 1 MULTIPLE ACCESS PROTOCOLS 2. 1 MULTIPLE ACCESS LINKS, PROTOCOLS Two types of links : point-to-point broadcast (shared wire or medium) POINT-TO-POINT PPP for dial-up

More information

Link Layer. 5.1 Introduction and services 5.2 Error detection and correction 5.3Multiple access protocols 5.4 Link-Layer Addressing 5.

Link Layer. 5.1 Introduction and services 5.2 Error detection and correction 5.3Multiple access protocols 5.4 Link-Layer Addressing 5. Link Layer 5.1 Introduction and services 5.2 Error detection and correction 5.3Multiple access protocols 5.4 Link-Layer Addressing 5.5 Ethernet 5.6 Link-layer switches 5.7 PPP 5.8 Link Virtualization:

More information

Wireless Networks. Wireless Links. Mike Freedman hap:// Interference / bit errors

Wireless Networks. Wireless Links. Mike Freedman hap://  Interference / bit errors 1! Widespread Deployment 2! Wireless Networks COS 461: Computer Networks Spring 2013 Mike Freedman hap://www.cs.princeton.edu/courses/archive/spring13/cos461/ Worldwide cellular subscribers 1993: 34 million

More information

Last time?! Block 3: Lecture 1! Wireless networks! Ingredients 2: Antennas! Ingredients 1: Mobile Phones, PDAs & Co.! 20/05/14. Part 3: lecture 3!

Last time?! Block 3: Lecture 1! Wireless networks! Ingredients 2: Antennas! Ingredients 1: Mobile Phones, PDAs & Co.! 20/05/14. Part 3: lecture 3! 20/05/14 Last time? WiFi Block 3: Lecture 1 Part 3: lecture 3 Wireless s Speed and ranges and channels Specifications DCF mechanisms WiMax Mobile s Ingredients 1: Mobile Phones, PDAs & Co. Ingredients

More information

1 Wireless Network Architecture

1 Wireless Network Architecture CHAPTER 1 Wireless Network Architecture INTRODUCTION Wireless networks come in all shapes and sizes. While many aspects of these diverse networks have common foundations, there are several other aspects

More information

Addressing: when mobile is moving around. Mobile Registration. Principles of Mobile Routing. Mobility via Indirect Routing

Addressing: when mobile is moving around. Mobile Registration. Principles of Mobile Routing. Mobility via Indirect Routing Wireless Networks Wireless Networks Kai Shen Advantages of wireless links: Mobility, easy setup Wireless s: Infrastructured wireless s Ad hoc wireless s Often, but sometimes fixed location /8/009 CSC 57/57

More information

Last time. BGP policy. Broadcast / multicast routing. Link virtualization. Spanning trees. Reverse path forwarding, pruning Tunneling

Last time. BGP policy. Broadcast / multicast routing. Link virtualization. Spanning trees. Reverse path forwarding, pruning Tunneling Last time BGP policy Broadcast / multicast routing Spanning trees Source-based, group-shared, center-based Reverse path forwarding, pruning Tunneling Link virtualization Whole networks can act as an Internet

More information

Extending or Interconnecting LANS. Physical LAN segment. Virtual LAN. Forwarding Algorithm 11/9/15. segments. VLAN2, Port3. VLAN1, Port1.

Extending or Interconnecting LANS. Physical LAN segment. Virtual LAN. Forwarding Algorithm 11/9/15. segments. VLAN2, Port3. VLAN1, Port1. Physical LAN segment q Hosts connected on the same physical LAN segment q Same subnet; L2 forwarding q ARP (IPè MAC) L2 frame (S, D), send q Scale? Extending or Interconnecting LANS q q q Why not just

More information

Part I. Wireless Communication

Part I. Wireless Communication 1 Part I. Wireless Communication 1.5 Topologies of cellular and ad-hoc networks 2 Introduction Cellular telephony has forever changed the way people communicate with one another. Cellular networks enable

More information

Long Distance Wireless Communication. Principally satellite communication:

Long Distance Wireless Communication. Principally satellite communication: Long Distance Wireless Communication Principally satellite communication: Uplink/Downlink Footprint LOS (line of sight) communication satellite base station is relay Effective for broadcast Limited bandwidth

More information

Computer Networks, Andrew Tannenbaum, Chapter 5.6. Computer Networking: A Top Down Approach Featuring the

Computer Networks, Andrew Tannenbaum, Chapter 5.6. Computer Networking: A Top Down Approach Featuring the Mobile IP (IPv4 and IPv6) Dr. John Keeney 3BA33 Elements of a wireless Wired infrastructure wireless hosts laptop, PDA, IP phone run applications may be stationary (nonmobile) or mobile wireless does not

More information

Wireless and Mobile Networks

Wireless and Mobile Networks Wireless and Mobile Networks Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@wustl.edu Audio/Video recordings of this lecture are available on-line at: http://www.cse.wustl.edu/~jain/cse473-09/

More information

Multiple Access in Cellular and Systems

Multiple Access in Cellular and Systems Multiple Access in Cellular and 802.11 Systems 1 GSM The total bandwidth is divided into many narrowband channels. (200 khz in GSM) Users are given time slots in a narrowband channel (8 users) A channel

More information

M06:Wireless and Mobile Networks. Corinna Schmitt

M06:Wireless and Mobile Networks. Corinna Schmitt M06:Wireless and Mobile Networks Corinna Schmitt corinna.schmitt@unibas.ch Acknowledgement 2016 M06 2 Background q # wireless (mobile) phone subscribers now exceeds # wired phone subscribers (5-to-1)!

More information

Wireless Challenges : Computer Networking. Overview. Routing to Mobile Nodes. Lecture 25: Wireless Networking

Wireless Challenges : Computer Networking. Overview. Routing to Mobile Nodes. Lecture 25: Wireless Networking Wireless Challenges 15-441: Computer Networking Lecture 25: Wireless Networking Force us to rethink many assumptions Need to share airwaves rather than wire Don t know what hosts are involved Host may

More information

Lecture 23 Overview. Last Lecture. This Lecture. Next Lecture ADSL, ATM. Wireless Technologies (1) Source: chapters 6.2, 15

Lecture 23 Overview. Last Lecture. This Lecture. Next Lecture ADSL, ATM. Wireless Technologies (1) Source: chapters 6.2, 15 Lecture 23 Overview Last Lecture ADSL, ATM This Lecture Wireless Technologies (1) Wireless LAN, CSMA/CA, Bluetooth Source: chapters 6.2, 15 Next Lecture Wireless Technologies (2) Source: chapter 16, 19.3

More information

Wireless Internet Routing. Review of Wireless Networking (with Routing in Mind)

Wireless Internet Routing. Review of Wireless Networking (with Routing in Mind) Wireless Internet Routing Review of Wireless Networking (with Routing in Mind) 1 Review of Wireless Networking Architecture of wireless networks Wireless PHY Wireless MAC o 802.11 PHY: physical layer /

More information

EC Wireless Networks VIII - Semester Questions Bank

EC Wireless Networks VIII - Semester Questions Bank EC 6802 - Wireless Networks VIII - Semester Questions Bank UNIT I PART A 1. Find out the capacity of a single IS-95 cell that uses QPSK modulation and convolutional coding 3 db < Sr < 9 db, and bandwidth

More information

Cellular Communication

Cellular Communication Cellular Communication Cellular Communication Cellular communication is designed to provide communications between two moving units, or between one mobile unit and one stationary phone or land unit (PSTN).

More information

Chapter 6 Wireless and Mobile Networks. Chapter 6 outline. Chapter 6: Wireless and Mobile Networks. Elements of a wireless network

Chapter 6 Wireless and Mobile Networks. Chapter 6 outline. Chapter 6: Wireless and Mobile Networks. Elements of a wireless network Chapter 6 Wireless and Mobile Networks Computer Networking: Top Down pproach 5 th edition. Jim Kurose, Keith Ross ddison-wesley, pril 009. Chapter 6: Wireless and Mobile Networks ackground: # wireless

More information

Lecture 4: Wireless MAC Overview. Hung-Yu Wei National Taiwan University

Lecture 4: Wireless MAC Overview. Hung-Yu Wei National Taiwan University Lecture 4: Wireless MAC Overview Hung-Yu Wei National Taiwan University Medium Access Control Topology 3 Simplex and Duplex 4 FDMA TDMA CDMA DSSS FHSS Multiple Access Methods Notice: CDMA and spread spectrum

More information

Understanding Carrier Wireless Systems

Understanding Carrier Wireless Systems Understanding Course Description This course provides a detailed scope of modern mobile and cellular network technologies used for second generation, 2G+, 3G and 4G networks. It provides an understanding

More information

Wireless networks. Wireless Network Taxonomy

Wireless networks. Wireless Network Taxonomy Wireless networks two components to be considered in deploying applications and protocols wireless links ; mobile computing they are NOT the same thing! wireless vs. wired links lower bandwidth; higher

More information

Chapter 10: Wireless LAN & VLANs

Chapter 10: Wireless LAN & VLANs Chapter 10: Wireless LAN & VLANs Abdullah Konak School of Information Sciences and Technology Penn State Berks Wireless Transmission for LAN Radio Frequency Transmission (RF) Infrared Transmission 2 1

More information

COLLEGE OF ENGINEERING DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK UNIT-1 WIRELESS COMMUNICATION FUNDAMENTALS

COLLEGE OF ENGINEERING DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK UNIT-1 WIRELESS COMMUNICATION FUNDAMENTALS KINGS COLLEGE OF ENGINEERING DEPARTMENT OF INFORMATION TECHNOLOGY QUESTION BANK SUBJECT CODE& NAME: IT1403 MOBILE COMPUTING YEAR / SEM : IV / VIII UNIT-1 WIRELESS COMMUNICATION FUNDAMENTALS PART A (2MARKS)

More information

Wireless networks: from cellular to ad hoc

Wireless networks: from cellular to ad hoc Wireless networks: from cellular to ad hoc The three wireless waves Wave #1: cellular telephony Still, biggest profit maker Wave #2 : wireless Internet access Most Internet access on US campuses is wireless

More information

15-441: Computer Networking. Wireless Networking

15-441: Computer Networking. Wireless Networking 15-441: Computer Networking Wireless Networking Outline Wireless Challenges 802.11 Overview Link Layer Ad-hoc Networks 2 Assumptions made in Internet Host are (mostly) stationary Address assignment, routing

More information

Announcements. CMPE 257: Wireless and Mobile Networking. Today. Location Management. Project status update 2. Graded exams. Hw 4 (?) Project report.

Announcements. CMPE 257: Wireless and Mobile Networking. Today. Location Management. Project status update 2. Graded exams. Hw 4 (?) Project report. CMPE 257: Wireless and Mobile Networking Spring 2003 Lecture 17 Announcements Project status update 2. Graded exams. Hw 4 (?) Project report. CMPE 257 Spring 2003 1 CMPE 257 Spring 2003 2 Today Location

More information

Wireless Networks (CSC-7602) Lecture 1 (27 Aug 2007)

Wireless Networks (CSC-7602) Lecture 1 (27 Aug 2007) Wireless Networks (CSC-7602) Lecture 1 (27 Aug 2007) Seung-Jong Park (Jay) http://www.csc.lsu.edu/~sjpark 1 Handouts Class information Schedule (check online frequently) 2 1 Goals Principles on Wireless

More information

Architecture and Prototyping of an based Self-Organizing Hierarchical Ad-Hoc Wireless Network (SOHAN)

Architecture and Prototyping of an based Self-Organizing Hierarchical Ad-Hoc Wireless Network (SOHAN) Architecture and Prototyping of an 802.11- based Self-Organizing Hierarchical Ad-Hoc Wireless Network (SOHAN) PIMRC 2004, Barcelona Sept 5-8, 2004 S. Ganu, L. Raju, B. Anepu, S. Zhao, I. Seskar and D.

More information

MSIT 413: Wireless Technologies Week 8

MSIT 413: Wireless Technologies Week 8 MSIT 413: Wireless Technologies Week 8 Michael L. Honig Department of EECS Northwestern University November 2017 The Multiple Access Problem How can multiple mobiles access (communicate with) the same

More information