02/21/08 TDC Branch Offices. Headquarters SOHO. Hot Spots. Home. Wireless LAN. Customer Sites. Convention Centers. Hotel

Size: px
Start display at page:

Download "02/21/08 TDC Branch Offices. Headquarters SOHO. Hot Spots. Home. Wireless LAN. Customer Sites. Convention Centers. Hotel"

Transcription

1 TDC 363 Introductions to LANs Lecture 7 Wireless LAN 1 Outline WLAN Markets and Business Cases WLAN Standards WLAN Physical Layer WLAN MAC Layer WLAN Security WLAN Design and Deployment 2 The Mobile Environment (ubiquitous) Headquarters Branch Offices SOHO Home Convention Centers Wireless LAN Hotel Hot Spots Customer Sites 3

2 Why Wireless LAN? Mobility Flexibility Ease of deployment Places where there is no cabling infrastructure Cost Relatively low cost of deployment Continual drop in price for WLAN equipment Performance Higher speed standards Protocol standards Logical Link Control (LLC) infrared FHSS Media Access Control (MAC) DSSS a OFDM b g HR-DSSS OFDM n MIMO Standards operations at 2.4 GHz a operations at 5GHz b operations at 2.4GHz d aim to promote world-wide wide use of e Supplement of QoS over f To achieve WAP interoperability g Improvement of b with 54M h Support regulatory provision in Europe i Support WLAN security (802.1X + more) n - Higher throughput improvements (theoretically up to 500M, practically up to 150M) s metro wireless Personal Area Network Bluetooth Broadband Wireless (aka WiMax) Wireless Metro LAN 6

3 Physical layer Diffused Infrared (IR) nm Limitation: short physical distance Line of sight (direct) or ceiling reflection (diffused) Spread Spectrum Unlicensed Radio Frequency (RF) Industry, Scientific, and Medical Applications (ISM) GHz Frequency Hopping Spread Spectrum (FHSS) Direct Sequence Spread Spectrum (DSSS) Orthogonal Frequency Division Multiplexing (OFDM) 7 Wireless Transmission Infrared (IR) Radio Frequency (RF) Spread Spectrum Frequency Hopping Direct Sequence OFDM MIMO OFDM: Orthogonal Frequency Division Multiplexing MIMO: Multiple Input and Multiple Output 8 Spread Spectrum The bandwidth of spread spectrum is several times of the original bandwidth. Amplitude Amplitude Original Bandwidth Spread Spectrum Bandwidth 9

4 Why Spread Spectrum? It is the foundation used in the ISM bands. It is a requirement for unlicensed device. It makes the transmission look like noise to a traditional narrowband receiver. It alleviates interference, but does not eliminate it. How do you address the issue of interference: Limit the power of transmission. 10 Frequency Hopping Spread Spectrum (FHSS) requency )GHz) Fr st 2nd 3rd 4th 5th Use multiple frequencies to send the data. 2. Instead of using a bandwidth of 10MHz, the above FHSS uses 50MHz st bit (or group of bits) is sent on 2.44G, the 2 nd bit is sent on 2.41G, and the 3 rd bit is sent on 2.40G, etc. 11 Direct Sequence Spread Spectrum (DSSS) Each bit (0 or 1) is replaced by a sequence of bits, called chip code, and then sent out. 0: :00110 complement of 0 s chip code If the original bit steam is 1M bps, the data rate will be 5M bps (chip code = 5 bits in the above diagram). 12

5 Orthogonal Frequency Division Multiplexing (OFDM) It is a technique to increase transmission speed by multiplexing. It uses one wide frequency channel by breaking it up into several sub-channels. All small sub-channels are multiplexed into one fat channel. Orthogonal: overlapping but distinguishable 13 OFDM Ref MIMO (multiple antennas for transmission and reception) Ref: 15

6 BSSID 1 BSSID 2 WLAN Operation Mode Wireless Access Point Ad hoc Mode Infrastructure Mode 16 WLAN Topology (BSS and ESS) (BSS) DS BSSID 1 BSSID 2 Basic Service Set (BSS) Single Cell (each AP is a BSS, and has a BSSID) Wireless stations selects the BSSID to associate with a single WAP. Extended Service Set (ESS) Multiple cells Distribution System 17 Station Mobility No transition Stationary or moving within direct communication range of single BSS BSS transition mobility Moving between two BSSs within a single ESS ESS transition mobility From a BSS in one ESS to a BSS in another ESS Disruption of service likely 18

7 Wireless Access Point (WAP) - Bridge Wireless LAN Bridge MAC (802.11) MAC (802.3) PHY PHY Wired LAN Frame Format Ref. IEEE standards Review: How many address fields in a frame? Answer: 2 Question: Why do we need four address fields in ? 20 To DS Addresses From DS Address DA 0 1 DA 1 0 Receiving AP 1 1 Receiving AP DS: Distribution System BSSID: Basic Service Set ID Address 2 SA Sending AP SA Sending AP Address 3 BSSID SA DA DA DA: Destination Address SA: Source Address Address 4 N/A N/A N/A SA 21

8 Example A1: A2: A3: (BSSID) A4: not used 22 Example -01 wireless wired A1: A2: A3: A4: not used SA: DA: Example -10 wireless wired A1: A2: A3: A4: not used SA: DA:

9 In-Class Discussion B C A D Q: What is the content of MAC address fields at each point? Important note: frame has only TWO address fields, and frame has FOUR address fields. 25 wired Example -11 wireless wired SA: DA: A1: A2: A3: A4: SA: DA: Wireless Bridge Building A Building B Ethernet Backbone Ethernet Backbone Wireless Bridge Wireless Bridge 27

10 Wireless Repeater LAN Backbone Case 11 Wireless repeater Case MAC Layer Access Methods Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) Difference from CSMA/CD (802.3) Cannot detect collision signal in wireless LAN Two access methods: Distributed Coordination Function (DCF) Point Coordination Function (PCF) 29 Distributed Coordination Function (DCF) The lower sublayer function of MAC CSMA/CA Collision Avoidance No collision detection (A station cannot detect the collision signal from other stations.) Also includes a set of delays which essentially provides a set of priority levels Interframe space (IFS) Short IFS (SIFS) for control frames DCF IFS (DCFS) for data frames 30

11 DCF Algorithm If medium is idle, station waits to see if medium remains idle for a time equal to IFS (interframe space). If it is still idle, transmit If medium is busy (either initially found busy or becomes busy during IFS), station continues to listen When medium becomes idle, station delays another IFS. If it is still idle after IFS, station chooses a random backoff factor. When backoff counter reaches zero, transmit packet. 31 CSMA/CA (DCF) IEEE Standard 32 MAC Level Acknowledgement Frame1 Frame2 TImeout Frame2 Sender ACK ACK Receiver Question: what if data frame is OK but ACK is lost? 33

12 RTS/CTS An optional procedure It consumes a fair amount of resource and introducers significant latency. It is used only in network with high-degree of contention on transmission. 34 Hand Shaking (optional) RTS CTS Data ACK RTS: Request To Send CTS: Clear To Send ACK: Acknowledgement 35 Network Allocation Vector (NAV) Each RTS frame includes the duration of the time its needs to occupy the channel. NAV: a timer to inform other stations which have to wait NAV before checking if the channel is free. When a station sends RTS, other stations on the system start NAV. 36

13 Network Allocation Vector (NAV) IEEE Standard 37 Hidden Station Problem A B C A talks to B. C does not know this communication and wants to talk to B. Collisions. 38 Hidden Station Problem (Solution) A B C RTS CTS Data RTS CTS/NAV 39

14 Busy Medium Physically busy: : a station senses the wireless medium to determine if it is busy. Virtually busy: : a station receives a control message (RTS or CTS) which indicates the wireless medium is busy for the duration of the NAV timer. 40 Point Coordination Function (PCF) Optional and implemented on top of DCF A single AP controls access to the media, and a Point Coordinator Agent resides in the AP. AP polls each station for data, and after a given time interval moves to the next station. POLL is a control message sent from AP to individual stations. Guaranteed maximum latency No stations are allowed to transmit unless it is pooled. AP could have a priority scheme for stations. PCF is useful for time-sensitive applications, but it New standard: e for Wireless Quality of Service (QoS) 41 PCF (cont.) IEEE Standard NAV: network allocation vector 42

15 Additional WLAN Features Positive Acknowledgement Sequence Control Wireless frame is guaranteed to be delivered in sequence, why do we need sequence control? Fragmentation Error-prone media 43 IEEE b First modification to the standard HR-DSSS (High Rate DSSS) Baker code (chipping code) and Complementary Code Keying (CCK) Uses the 2.4 GHz band (ISM band) Channel: up to 14 (channel bandwidth: 5 MHz per channel) Non-overlapping overlapping channel: 3 Speed: 1 (Baker), 2 (Baker), 5.5 (CCK), and 11M bps (CCK) Distance: 300 ft Interference: cordless phone, microwave oven 44 IEEE a Higher speed protocol Transmissions in the 5 GHz band Spread Spectrum Transmission: orthogonal frequency division multiplexing (OFDM) Data rate: 6, , 12, 18, 24, 36, 48, or 54Mbps Mbps Distance: 60 ft Less interference than b More users per AP than b More non-overlapping overlapping channels (8 vs. 3) 45

16 IEEE g Two competing standards to improve b CCK => PBCC, 22M bps (This is known as b + ) DSSS => OFDM, 54M Frequency: G Hz (same as b) Speed: up to 54M bps Distance: comparable to b Shorter distance at higher rate Backward compatible with b Spread Spectrum Transmission: OFDM (same as a) 46 WLAN Performance b a g Link Rate (max) UDP TCP 11M bps 54M bps 54M bps 7.1M bps 30.5M bps 30.5M bps 5.9M bps 24.4M bps 24.4M bps The test was conducted in a lab environment, and the distance is expected to be less than 10m. Ref. WLAN Testing with IXIA IxChariot, IXIA White Paper 47 WLAN Performance (line rate) WLAN Performance Throughput (Mbps) g a b Distance (ft) Data Source: Cisco Networking Professional On-Line Live Tech Talk 48

17 802.11n example (Linksys WRT300N) Pre-N draft standard MIMO technology Number of antennas: 3 Backward compatible: b/g 2.4 GHz 4 range of g 12 speed of g Line speed: Up to 250M bps TCP performance: Up to 120M 49 Wireless LAN Design Frequency reuse Max throughput for each user Minimize interference Security 50 Very Bad Design overlapping Channels CH 2 CH 4 CH 1 CH 1 CH 11 CH 3 51

18 Better but it would not work, why? still some channel overlapping CH 6 CH 1 CH 11 CH 11 CH 1 CH 6 52 Physical Coverage (II) (2M, 5.5M, and 11M) CH-6 CH-1 CH-11 CH-11 CH-6 CH-1 53 RF Reuse (better design) Hexagonal shape for each cell 54

19 WLAN Security Service Set Identification (SSID) For station association Wired Equivalent Privacy (WEP) Shared key authentication Stations exchange the key for encryption. RC4 encryption algorithm Key: 40 bits or 128 bits User Authentication Not specified in X VPN 55 WEP Operation 40-bit WEP Key RC4 Algorithm 24-bit IV Integrity check 24-bit IV randomly generated 64-bit RC4 RC4 Key Stream Frame Header IV Header Frame Body ICV Trailer FCS 4 bytes 4 bytes IV: initialization vector ICV: integrity check value 56 WEP Key Distribution Issue Key is manually set in the driver. The key cannot be protected from local users. When a user leaves the organization, technically you must change the key information on all stations. What if a station is stolen? For a large organization, there is a need to publish the key which is a security problem. 57

20 WEP Design Issue Weakness in the Key Scheduling Algorithm, A weakness of RC4 in generating the keystream. Hacker attack: using weak IV to attack a particular byte of the secret portion of the RC4 key. The time to attack is a linear algorithm to the key length. This is a complete break for WEP. 58 Solutions to Security Issue Non-standard solutions Layer 3 VPN Layer 4 IP Address Control and Firewall Layer r7 Proxy Standard solution Extensible Authentication Protocol (EAP) 802.1X (including EAP) i (including 802.1X) 59 VPN for WLAN (Layer3) VPN Gateway LAN Layer 2 tunnel over a layer 3 protocol Ethernet VPN Tunnel IP IP Wireless LAN LAN RADIUS server 60

21 802.1X and EAP Extensible Authentication Protocol (EAP) is an IETF standard and adopted by IEEE as the basis for 802.1X. It is called the port based network access control. It supports a mutual authentication process STA and AP are authenticated to each other X does not specify the key management, but most implementations support a mechanism of dynamic key management. 10/22/07 61 TDC Extensible Authentication Protocol (EAP) EAP is an IETF standard and adopted by IEEE as the basis for 802.1X. It is called the port based network access control. EAP supports both wired and wireless authentication. MD5 TLS TTLS LEAP PEAP EAP PPP TLS: Transport Layer Security TTLS: Tunnel TLS LEAP: Lightweight EAP PEAP: Protected EAP 62 Supplicant Association i 802.1X Port-Based Network Access Control EAP over LAN EAP Response/Identify Response to the challenge Authenticator EAP over RADIUS EAP Request/Identify Authenticator may set restrictions on the access. Authentication Server (AS) (RADIUS) challenge success 10/22/07 63 TDC564-06

22 Protected EAP (PEAP) A secured password-based authentication method. Only the authentication server needs a certificate. AS sends a public key to the client. The client generate a master encryption key and uses the public key to encrypt the master key to the AS. This master key is used to establish a secure tunnel between AS and the client. Windows XP EAP Configuration 10/22/07 TDC i Security Management Supplicant EAP over LAN Authenticator EAP over RADIUS Authentication Server (RADIUS) Security discovery capability 802.1X Authentication Key Management Key Distribution Data Protection i Data Protection Temporal Key Integrity Protocol (TKIP) WPA 1.0 A wrapper around WEP Use message Integrity Code (MIC) to check the integrity of the header information Use MAC address to create unique key for each station. Change temporal key every 10,000 packets It is interoperable with WEP-only device Advanced Encryption Standard (AEP) WPA 2.0 Also known as CCMP (Counter Mode with CBC-MAC Protocol) This is to completely replace WEP. It offers the strongest data protection, conforming to the government standard It requires a new chip and won t work with existing devices. 66

23 New Product: Wireless Switch What is the issue? It is not cost effective to implement 802.1X on all Access points. It is also a management issue. Wireless Switch Authenticator RADIUS Note that the wireless switch supports 802.1X, but does not support as it does not have any wireless link. Supplicant Example: 67 Other Wireless Technologies Bluetooth - IEEE short distance (<10m), low data rate (<1M), low power consumption Ultra Wideband (UWB) IEEE a Short distance, much higher data rate than Bluetooth (>>100M) ZigBee IEEE Cheaper and lower data rate than Bluetooth WiMAX IEEE long distance (up to 30 miles), point-to-point connection (not broadcast), flexible data rates (1M to 75M) 68 Review Questions What are the advantages of wireless LAN? What is spread spectrum and why is it needed? What are different methods of spread spectrum used in ? Is there collision on WLAN (802.11)? If yes, can you detect it? How do you resolve the issue of collision? Can you use CSMA/CD for WLAN? Why? Illustrate the two operational modes of Describe the differences between DCF and PCF. How many MAC addresses are in the frame? Describe how these addresses are used (four scenarios). 69

24 Review Questions (cont.) Given a network diagram, show the address information in the MAC frames at wireline and wireless links. What is the problem of hidden station and what is the solution to this problem? What are the problems with WEP? What are the solutions to address the problems with WEP? What is EAP? How is it used in wireless LAN? What are the two encryption methods of i? 70 Review Questions (cont.) Compare a and g. What are the differences between WAP, wireless bridge, wireless repeater, and wireless switch? Draw a network diagram to show how each one is used. 71

Overview : Computer Networking. Spectrum Use Comments. Spectrum Allocation in US Link layer challenges and WiFi WiFi

Overview : Computer Networking. Spectrum Use Comments. Spectrum Allocation in US Link layer challenges and WiFi WiFi Overview 15-441 15-441: Computer Networking 15-641 Lecture 21: Wireless Justine Sherry Peter Steenkiste Fall 2017 www.cs.cmu.edu/~prs/15-441-f17 Link layer challenges and WiFi WiFi Basic WiFi design Some

More information

Wireless Communication and Networking CMPT 371

Wireless Communication and Networking CMPT 371 Wireless Communication and Networking CMPT 371 Wireless Systems: AM, FM Radio TV Broadcast Satellite Broadcast 2-way Radios Cordless Phones Satellite Links Mobile Telephony Systems Wireless Local Loop

More information

Wireless LAN -Architecture

Wireless LAN -Architecture Wireless LAN -Architecture IEEE has defined the specifications for a wireless LAN, called IEEE 802.11, which covers the physical and data link layers. Basic Service Set (BSS) Access Point (AP) Distribution

More information

Data and Computer Communications. Chapter 13 Wireless LANs

Data and Computer Communications. Chapter 13 Wireless LANs Data and Computer Communications Chapter 13 Wireless LANs Wireless LAN Topology Infrastructure LAN Connect to stations on wired LAN and in other cells May do automatic handoff Ad hoc LAN No hub Peer-to-peer

More information

Wireless Communication and Networking CMPT 371

Wireless Communication and Networking CMPT 371 Wireless Communication and Networking CMPT 371 Wireless Systems: AM, FM Radio TV Broadcast Satellite Broadcast 2-way Radios Cordless Phones Satellite Links Mobile Telephony Systems Wireless Local Loop

More information

04/11/2011. Wireless LANs. CSE 3213 Fall November Overview

04/11/2011. Wireless LANs. CSE 3213 Fall November Overview Wireless LANs CSE 3213 Fall 2011 4 November 2011 Overview 2 1 Infrastructure Wireless LAN 3 Applications of Wireless LANs Key application areas: LAN extension cross-building interconnect nomadic access

More information

Wireless technology Principles of Security

Wireless technology Principles of Security Wireless technology Principles of Security 1 Wireless technologies 2 Overview This module provides an introduction to the rapidly evolving technology of wireless LANs (WLANs). WLANs redefine the way the

More information

Computer Networks. Wireless LANs

Computer Networks. Wireless LANs Computer Networks Wireless LANs Mobile Communication Technology according to IEEE (examples) Local wireless networks WLAN 802.11 Personal wireless nw WPAN 802.15 WiFi 802.11a 802.11b 802.11h 802.11i/e/

More information

Wireless Networking based on Chapter 15 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers

Wireless Networking based on Chapter 15 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers Wireless Networking 802.11 based on Chapter 15 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers topics Standards Technical Concepts Implementation Troubleshooting 802.11 timeline source: Anandtech

More information

Local Area Networks NETW 901

Local Area Networks NETW 901 Local Area Networks NETW 901 Lecture 4 Wireless LAN Course Instructor: Dr.-Ing. Maggie Mashaly maggie.ezzat@guc.edu.eg C3.220 1 Contents What is a Wireless LAN? Applications and Requirements Transmission

More information

Wireless Networks. Authors: Marius Popovici Daniel Crişan Zagham Abbas. Technical University of Cluj-Napoca Group Cluj-Napoca, 24 Nov.

Wireless Networks. Authors: Marius Popovici Daniel Crişan Zagham Abbas. Technical University of Cluj-Napoca Group Cluj-Napoca, 24 Nov. Wireless Networks Authors: Marius Popovici Daniel Crişan Zagham Abbas Technical University of Cluj-Napoca Group 3250 Cluj-Napoca, 24 Nov. 2003 Presentation Outline Wireless Technology overview The IEEE

More information

IEEE MAC Sublayer (Based on IEEE )

IEEE MAC Sublayer (Based on IEEE ) IEEE 802.11 MAC Sublayer (Based on IEEE 802.11-1999) Wireless Networking Sunghyun Choi, Associate Professor Multimedia & Wireless Networking Lab. (MWNL) School of Electrical Engineering Seoul National

More information

Wireless Local Area Networks. Networks: Wireless LANs 1

Wireless Local Area Networks. Networks: Wireless LANs 1 Wireless Local Area Networks Networks: Wireless LANs 1 Wireless Local Area Networks The proliferation of laptop computers and other mobile devices (PDAs and cell phones) created an obvious application

More information

Wireless LANs. ITS 413 Internet Technologies and Applications

Wireless LANs. ITS 413 Internet Technologies and Applications Wireless LANs ITS 413 Internet Technologies and Applications Aim: Aim and Contents Understand how IEEE 802.11 wireless LANs work Understand what influences the performance of wireless LANs Contents: IEEE

More information

WiFi Networks: IEEE b Wireless LANs. Carey Williamson Department of Computer Science University of Calgary Winter 2018

WiFi Networks: IEEE b Wireless LANs. Carey Williamson Department of Computer Science University of Calgary Winter 2018 WiFi Networks: IEEE 802.11b Wireless LANs Carey Williamson Department of Computer Science University of Calgary Winter 2018 Background (1 of 2) In many respects, the IEEE 802.11b wireless LAN (WLAN) standard

More information

Data Communications. Data Link Layer Protocols Wireless LANs

Data Communications. Data Link Layer Protocols Wireless LANs Data Communications Data Link Layer Protocols Wireless LANs Wireless Networks Several different types of communications networks are using unguided media. These networks are generally referred to as wireless

More information

IEEE Wireless LANs

IEEE Wireless LANs Unit 11 IEEE 802.11 Wireless LANs Shyam Parekh IEEE 802.11 Wireless LANs References Standards Basics Physical Layer 802.11b 802.11a MAC Framing Details Management PCF QoS (802.11e) Security Take Away Points

More information

Chapter 6 Medium Access Control Protocols and Local Area Networks

Chapter 6 Medium Access Control Protocols and Local Area Networks Chapter 6 Medium Access Control Protocols and Local Area Networks 802.11 Wireless LAN CSE 3213, Winter 2010 Instructor: Foroohar Foroozan Wireless Data Communications Wireless communications compelling

More information

ICE 1332/0715 Mobile Computing (Summer, 2008)

ICE 1332/0715 Mobile Computing (Summer, 2008) ICE 1332/0715 Mobile Computing (Summer, 2008) IEEE 802.11 Prof. Chansu Yu http://academic.csuohio.edu/yuc/ Contents Overview of IEEE 802.11 Frame formats MAC frame PHY frame IEEE 802.11 IEEE 802.11b IEEE

More information

Topics for Today. More on Ethernet. Wireless LANs Readings. Topology and Wiring Switched Ethernet Fast Ethernet Gigabit Ethernet. 4.3 to 4.

Topics for Today. More on Ethernet. Wireless LANs Readings. Topology and Wiring Switched Ethernet Fast Ethernet Gigabit Ethernet. 4.3 to 4. Topics for Today More on Ethernet Topology and Wiring Switched Ethernet Fast Ethernet Gigabit Ethernet Wireless LANs Readings 4.3 to 4.4 1 Original Ethernet Wiring Heavy coaxial cable, called thicknet,

More information

Guide to Wireless Communications, Third Edition. Objectives

Guide to Wireless Communications, Third Edition. Objectives Guide to Wireless Communications, Third Edition Chapter 7 Low-Speed Wireless Local Area Networks Objectives Describe how WLANs are used List the components and modes of a WLAN Describe how an RF WLAN works

More information

Mobile Communications Chapter 7: Wireless LANs

Mobile Communications Chapter 7: Wireless LANs Mobile Communications Chapter 7: Wireless LANs Characteristics IEEE 802.11 (PHY, MAC, Roaming,.11a, b, g, h, i, n z) Bluetooth / IEEE 802.15.x IEEE 802.16/.20/.21/.22 RFID Comparison Prof. Jó Ueyama courtesy

More information

Wireless# Guide to Wireless Communications. Objectives

Wireless# Guide to Wireless Communications. Objectives Wireless# Guide to Wireless Communications Chapter 8 High-Speed WLANs and WLAN Security Objectives Describe how IEEE 802.11a networks function and how they differ from 802.11 networks Outline how 802.11g

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

Wireless Local Area Networks (WLANs)) and Wireless Sensor Networks (WSNs) Computer Networks: Wireless Networks 1

Wireless Local Area Networks (WLANs)) and Wireless Sensor Networks (WSNs) Computer Networks: Wireless Networks 1 Wireless Local Area Networks (WLANs)) and Wireless Sensor Networks (WSNs) Computer Networks: Wireless Networks 1 Wireless Local Area Networks The proliferation of laptop computers and other mobile devices

More information

Chapter 6 Wireless and Mobile Networks. Csci 4211 David H.C. Du

Chapter 6 Wireless and Mobile Networks. Csci 4211 David H.C. Du Chapter 6 Wireless and Mobile Networks Csci 4211 David H.C. Du Wireless LAN IEEE 802.11 a, b, g IEEE 802.15 Buletooth Hidden Terminal Effect Hidden Terminal Problem Hidden terminals A, C cannot hear each

More information

Introduction to Wireless Networking CS 490WN/ECE 401WN Winter Lecture 4: Wireless LANs and IEEE Part II

Introduction to Wireless Networking CS 490WN/ECE 401WN Winter Lecture 4: Wireless LANs and IEEE Part II Introduction to Wireless Networking CS 490WN/ECE 401WN Winter 2007 Lecture 4: Wireless LANs and IEEE 802.11 Part II This lecture continues the study of wireless LANs by looking at IEEE 802.11. I. 802.11

More information

Mobile & Wireless Networking. Lecture 7: Wireless LAN

Mobile & Wireless Networking. Lecture 7: Wireless LAN 192620010 Mobile & Wireless Networking Lecture 7: Wireless LAN [Schiller, Section 7.3] [Reader, Part 6] [Optional: "IEEE 802.11n Development: History, Process, and Technology", Perahia, IEEE Communications

More information

original standard a transmission at 5 GHz bit rate 54 Mbit/s b support for 5.5 and 11 Mbit/s e QoS

original standard a transmission at 5 GHz bit rate 54 Mbit/s b support for 5.5 and 11 Mbit/s e QoS IEEE 802.11 The standard defines a wireless physical interface and the MAC layer while LLC layer is defined in 802.2. The standardization process, started in 1990, is still going on; some versions are:

More information

Wireless Local Area Networks (WLANs) Part I

Wireless Local Area Networks (WLANs) Part I Wireless Local Area Networks (WLANs) Part I Raj Jain Professor of CSE Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu These slides are available on-line at: http://www.cse.wustl.edu/~jain/cse574-08/

More information

CSC344 Wireless and Mobile Computing. Department of Computer Science COMSATS Institute of Information Technology

CSC344 Wireless and Mobile Computing. Department of Computer Science COMSATS Institute of Information Technology CSC344 Wireless and Mobile Computing Department of Computer Science COMSATS Institute of Information Technology Wireless Local Area Networks (WLANs) Part I Almost all wireless LANs now are IEEE 802.11

More information

Overview of Wireless LANs

Overview of Wireless LANs Wireless LANs Chapter 17 CS420/520 Axel Krings Page 1 Overview of Wireless LANs use wireless transmission medium issues of high prices, low data rates, occupational safety concerns, & licensing requirements

More information

Mobile Communications Chapter 7: Wireless LANs

Mobile Communications Chapter 7: Wireless LANs Characteristics IEEE 802.11 PHY MAC Roaming IEEE 802.11a, b, g, e HIPERLAN Bluetooth Comparisons Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS02 7.1 Comparison: infrastructure vs.

More information

Wireless LAN. Access Point. Provides network connectivity over wireless media

Wireless LAN. Access Point. Provides network connectivity over wireless media LAN Technologies 802.11 Wireless LAN Network connectivity to the legacy wired LAN Access Point Desktop with PCI 802.11 LAN card Laptop with PCMCIA 802.11 LAN card Provides network connectivity over wireless

More information

Wireless Local Area Network (IEEE )

Wireless Local Area Network (IEEE ) Wireless Local Area Network (IEEE 802.11) -IEEE 802.11 Specifies a single Medium Access Control (MAC) sublayer and 3 Physical Layer Specifications. Stations can operate in two configurations : Ad-hoc mode

More information

3.1. Introduction to WLAN IEEE

3.1. Introduction to WLAN IEEE 3.1. Introduction to WLAN IEEE 802.11 WCOM, WLAN, 1 References [1] J. Schiller, Mobile Communications, 2nd Ed., Pearson, 2003. [2] Martin Sauter, "From GSM to LTE", chapter 6, Wiley, 2011. [3] wiki to

More information

Wireless Local Area Networks (WLANs) and Wireless Sensor Networks (WSNs) Primer. Computer Networks: Wireless LANs

Wireless Local Area Networks (WLANs) and Wireless Sensor Networks (WSNs) Primer. Computer Networks: Wireless LANs Wireless Local Area Networks (WLANs) and Wireless Sensor Networks (WSNs) Primer 1 Wireless Local Area Networks (WLANs) The proliferation of laptop computers and other mobile devices (PDAs and cell phones)

More information

CHAPTER 11 WIRELESS LAN TECHNOLOGY AND THE IEEE WIRELESS LAN STANDARD

CHAPTER 11 WIRELESS LAN TECHNOLOGY AND THE IEEE WIRELESS LAN STANDARD CHAPTER 11 WIRELESS LAN TECHNOLOGY AND THE IEEE 802.11 WIRELESS LAN STANDARD These slides are made available to faculty in PowerPoint form. Slides can be freely added, modified, and deleted to suit student

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 Networking Basics. Ed Crowley

Wireless Networking Basics. Ed Crowley Wireless Networking Basics Ed Crowley 2014 Today s Topics Wireless Networking Economic drivers and Vulnerabilities IEEE 802.11 Family WLAN Operational Modes Wired Equivalent Privacy (WEP) WPA and WPA2

More information

Overview of IEEE Networks. Timo Smura

Overview of IEEE Networks. Timo Smura Overview of IEEE 802.11 Networks Timo Smura 24.03.2004 Outline Introduction IEEE 802.11 standards Protocol model Network topologies 802.11 MAC layer 802.11 PHY layers Interoperability: Wi-Fi Alliance 3GPP

More information

I N D E X Numerics 100 Mbps WLANs, WLANs, 88

I N D E X Numerics 100 Mbps WLANs, WLANs, 88 I N D E X Numerics 100 Mbps WLANs, 233 234 802.11 WLANs, 88 control frames, 54 ACK frames, 57 CF-End frames, 57 58 CTS frames, 56 PS-Poll frames, 54 55 RTS frames, 55 56 DSSS, 93-95 data frames, 76-78

More information

IEEE Wireless LANs Part I: Basics

IEEE Wireless LANs Part I: Basics IEEE 802.11 Wireless LANs Part I: Basics Raj Jain Professor of Computer Science and Engineering Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video recordings of this

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

CSMC 417. Computer Networks Prof. Ashok K Agrawala Ashok Agrawala. Fall 2018 CMSC417 Set 1 1

CSMC 417. Computer Networks Prof. Ashok K Agrawala Ashok Agrawala. Fall 2018 CMSC417 Set 1 1 CSMC 417 Computer Networks Prof. Ashok K Agrawala 2018 Ashok Agrawala Fall 2018 CMSC417 Set 1 1 The Medium Access Control Sublayer November 18 Nov 6, 2018 2 Wireless Networking Technologies November 18

More information

EE 597: Wireless Networks (Spring 12)

EE 597: Wireless Networks (Spring 12) EE 597: Wireless Networks (Spring 12) Intro to Cellular and WiFi Networks Bhaskar Krishnamachari= Acknowledgement These slides were prepared by Dr. Kyuho Son, kyuhoson@usc.edu, visiting scholar at USC.

More information

4.3 IEEE Physical Layer IEEE IEEE b IEEE a IEEE g IEEE n IEEE 802.

4.3 IEEE Physical Layer IEEE IEEE b IEEE a IEEE g IEEE n IEEE 802. 4.3 IEEE 802.11 Physical Layer 4.3.1 IEEE 802.11 4.3.2 IEEE 802.11b 4.3.3 IEEE 802.11a 4.3.4 IEEE 802.11g 4.3.5 IEEE 802.11n 4.3.6 IEEE 802.11ac,ad Andreas Könsgen Summer Term 2012 4.3.3 IEEE 802.11a Data

More information

Investigation of WLAN

Investigation of WLAN Investigation of WLAN Table of Contents Table of Contents...1 ABBREVIATIONS...II 1 Introduction...3 2 IEEE 802.11...3 2.1 Architecture...3 2.2 MAC layer...4 2.3 PHY layer...9 2.4 Mobility in IEEE 802.11...12

More information

Wireless Communications

Wireless Communications 4. Medium Access Control Sublayer DIN/CTC/UEM 2018 Why do we need MAC for? Medium Access Control (MAC) Shared medium instead of point-to-point link MAC sublayer controls access to shared medium Examples:

More information

Introduction to IEEE

Introduction to IEEE Introduction to IEEE 802.11 Characteristics of wireless LANs Advantages very flexible within the reception area Ad hoc networks without previous planning possible (almost) no wiring difficulties more robust

More information

Advanced Security and Mobile Networks

Advanced Security and Mobile Networks Advanced Security and Mobile Networks W.Buchanan (1) 9. GSM/3G Unit 7: Mobile Networks. Wireless. Security. Mobile IP. Mobile Agents. Spread spectrum. Military/Emergency Networks 8. Ad-hoc 7. Mobile Networks

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

standard. Acknowledgement: Slides borrowed from Richard Y. Yale

standard. Acknowledgement: Slides borrowed from Richard Y. Yale 802.11 standard Acknowledgement: Slides borrowed from Richard Y. Yang @ Yale IEEE 802.11 Requirements Design for small coverage (e.g. office, home) Low/no mobility High data rate applications Ability to

More information

Technical Introduction

Technical Introduction 802.11 Technical Introduction Tomas Krag t@wire.less.dk Unlicensed Spectrum There was a need for spectrum with fewer regulations The ISM band at 2.4 Ghz & 5.2 GHz The UNII band at 5.8 GHz No need for a

More information

WIRELESS LANS. By: M. Habibullah Pagarkar Mandar Gori Rajesh Jaiswal

WIRELESS LANS. By: M. Habibullah Pagarkar Mandar Gori Rajesh Jaiswal WIRELESS LANS By: M. Habibullah Pagarkar Mandar Gori Rajesh Jaiswal Introduction Why wireless? World will become fully mobile Increase in wireless devices usage Wireless will succeed; integrates into many

More information

Wireless# Guide to Wireless Communications. Objectives

Wireless# Guide to Wireless Communications. Objectives Wireless# Guide to Wireless Communications Chapter 7 Low-Speed Wireless Local Area Networks Objectives Describe how WLANs are used List the components and modes of a WLAN Describe how an RF WLAN works

More information

CSE 461: Wireless Networks

CSE 461: Wireless Networks CSE 461: Wireless Networks Wireless IEEE 802.11 A physical and multiple access layer standard for wireless local area networks (WLAN) Ad Hoc Network: no servers or access points Infrastructure Network

More information

Wireless Terms. Uses a Chipping Sequence to Provide Reliable Higher Speed Data Communications Than FHSS

Wireless Terms. Uses a Chipping Sequence to Provide Reliable Higher Speed Data Communications Than FHSS How to Set Up a Secure Home Wireless Network What you don t know about setting up a home wireless network can hurt you. 2008 APCUG Convention Session Tom Jones, P.E., RCDD-NTS CQS-CWLSS AGENDA Some Terms

More information

based on Chapter 15 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers

based on Chapter 15 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers Wireless Networking 802.11 based on Chapter 15 of CompTIA Network+ Exam Guide, 4th ed., Mike Meyers topics History Standards Technical Concepts Implementation Troubleshooting 1 HISTORY AND STANDARDS History

More information

Requirements Analysis of IP and MAC Protocols for Dedicated Short Range Communications (DSRC)

Requirements Analysis of IP and MAC Protocols for Dedicated Short Range Communications (DSRC) Requirements Analysis of IP and MAC Protocols for Dedicated Short Range Communications (DSRC) James T. Yu, jyu@cs.depaul.edu School of Computer Science, Telecommunications, and Information Systems DePaul

More information

Wireless Protocols. Training materials for wireless trainers

Wireless Protocols. Training materials for wireless trainers Wireless Protocols Training materials for wireless trainers Goals The goal of this lecture is to introduce: IEEE wireless protocols coverage 802.11 radio protocols terminology WiFi modes of operation details

More information

Wireless Technologies

Wireless Technologies Wireless Technologies Networking for Home and Small Businesses Chapter 7 Manju. V. Sankar 1 Objectives Describe wireless technologies. Describe the various components and structure of a WLAN Describe wireless

More information

CMPE 257: Wireless and Mobile Networking

CMPE 257: Wireless and Mobile Networking CMPE 257: Wireless and Mobile Networking Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 3 CMPE 257 Winter'11 1 Announcements Accessing secure part of the class Web page: User id: cmpe257.

More information

Wireless LANs. The Protocol Stack The Physical Layer The MAC Sublayer Protocol The Frame Structure Services 802.

Wireless LANs. The Protocol Stack The Physical Layer The MAC Sublayer Protocol The Frame Structure Services 802. Wireless LANs The 802.11 Protocol Stack The 802.11 Physical Layer The 802.11 MAC Sublayer Protocol The 802.11 Frame Structure Services 56 802.11 The 802.11 Working Group The IEEE 802.11 was formed in July

More information

1. INTRODUCTION. Wi-Fi 1

1. INTRODUCTION. Wi-Fi 1 Wi-Fi 1 1. INTRODUCTION Wi-Fi, or Wireless Fidelity, is freedom: it allows you to connect to the Internet from your home, a bed in a hotel room or at a conference room at work without wires. How? Wi-Fi

More information

Lecture 16: QoS and "

Lecture 16: QoS and Lecture 16: QoS and 802.11" CSE 123: Computer Networks Alex C. Snoeren HW 4 due now! Lecture 16 Overview" Network-wide QoS IntServ DifServ 802.11 Wireless CSMA/CA Hidden Terminals RTS/CTS CSE 123 Lecture

More information

Advanced Computer Networks WLAN

Advanced Computer Networks WLAN Advanced Computer Networks 263 3501 00 WLAN Patrick Stuedi Spring Semester 2014 1 Oriana Riva, Department of Computer Science ETH Zürich Last week Outlook Medium Access COPE Short Range Wireless Networks:

More information

Institute of Electrical and Electronics Engineers (IEEE) IEEE standards

Institute of Electrical and Electronics Engineers (IEEE) IEEE standards HW Institute of Electrical and Electronics Engineers (IEEE) IEEE 802.11 standards WLAN Standard (IEEE 802.11) The IEEE 802.11 is a family of standards that governs the operations and functions of WLANs.

More information

Medium Access Control. MAC protocols: design goals, challenges, contention-based and contention-free protocols

Medium Access Control. MAC protocols: design goals, challenges, contention-based and contention-free protocols Medium Access Control MAC protocols: design goals, challenges, contention-based and contention-free protocols 1 Why do we need MAC protocols? Wireless medium is shared Many nodes may need to access the

More information

CMPE 257: Wireless and Mobile Networking

CMPE 257: Wireless and Mobile Networking CMPE 257: Wireless and Mobile Networking Katia Obraczka Computer Engineering UCSC Baskin Engineering Lecture 3 CMPE 257 Spring'15 1 Next week Announcements April 14: ICN (Spencer Sevilla) April 16: DTN

More information

Chapter 7. Basic Wireless Concepts and Configuration. Part I

Chapter 7. Basic Wireless Concepts and Configuration. Part I Chapter 7 Basic Wireless Concepts and Configuration Part I CCNA3-1 Chapter 7-1 Note for Instructors These presentations are the result of a collaboration among the instructors at St. Clair College in Windsor,

More information

Outline / Wireless Networks and Applications Lecture 9: Wireless LANs Aloha and 802 Wireless. Regular Ethernet CSMA/CD

Outline / Wireless Networks and Applications Lecture 9: Wireless LANs Aloha and 802 Wireless. Regular Ethernet CSMA/CD Page 1 Outline 18-452/18-750 Wireless Networks and Applications Lecture 9: Wireless LANs Aloha and 802 Wireless Peter Steenkiste Data link fundamentals» And what changes in wireless Aloha Ethernet Wireless-specific

More information

Announcements / Wireless Networks and Applications Lecture 9: Wireless LANs Wireless. Regular Ethernet CSMA/CD.

Announcements / Wireless Networks and Applications Lecture 9: Wireless LANs Wireless. Regular Ethernet CSMA/CD. Announcements 18-452/18-750 Wireless Networks and Applications Lecture 9: Wireless LANs 802.11 Wireless Peter Steenkiste Homework 1 should be out by tomorrow Project 1 by Friday Schedule:» Thursday lecture

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

Outline. CS5984 Mobile Computing. IEEE 802 Architecture 1/7. IEEE 802 Architecture 2/7. IEEE 802 Architecture 3/7. Dr. Ayman Abdel-Hamid, CS5984

Outline. CS5984 Mobile Computing. IEEE 802 Architecture 1/7. IEEE 802 Architecture 2/7. IEEE 802 Architecture 3/7. Dr. Ayman Abdel-Hamid, CS5984 CS5984 Mobile Computing Dr. Ayman Abdel-Hamid Computer Science Department Virginia Tech Outline IEEE 82 Architecture IEEE 82. Wireless LANs Based on Chapter 4 in Wireless Communications and Networks, William

More information

IEEE WLANs (WiFi) Part II/III System Overview and MAC Layer

IEEE WLANs (WiFi) Part II/III System Overview and MAC Layer IEEE 802.11 WLANs (WiFi) Part II/III System Overview and MAC Layer Design goals for wireless LANs (WLANs) Global, seamless operation Low power for battery use No special permissions or licenses needed

More information

CS263: Wireless Communications and Sensor Networks

CS263: Wireless Communications and Sensor Networks CS263: Wireless Communications and Sensor Networks Matt Welsh Lecture 5: The 802.11 Standard October 7, 2004 2004 Matt Welsh Harvard University 1 All about 802.11 Today's Lecture CSMA/CD MAC and DCF WEP

More information

Hands-On Exercises: IEEE Standard

Hands-On Exercises: IEEE Standard Hands-On Exercises: IEEE 802.11 Standard Mohammad Hossein Manshaei and Jean-Pierre Hubaux {hossein.manshaei,jean-pierre.hubaux}@epfl.ch Laboratory for Computer Communications and Applications (LCA) March

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

Author: Bill Buchanan. Wireless LAN. Unit 2: Wireless Fundamentals

Author: Bill Buchanan. Wireless LAN. Unit 2: Wireless Fundamentals Wireless LAN Unit 2: Wireless Fundamentals Wireless connections which technology? Areas covered: Basic radio parameters. This area covers the main type of wireless communications. IEEE 802.11b issues.

More information

Introduction. Giuseppe Bianchi, Ilenia Tinnirello

Introduction. Giuseppe Bianchi, Ilenia Tinnirello IEEE 802.11 Wireless LANs Introduction WLAN History Ł Original goal: Deploy wireless Ethernet First generation proprietary solutions (end 80, begin 90) WaveLAN (AT&T)) HomeRF (Proxim) Abandoned by major

More information

Security in IEEE Networks

Security in IEEE Networks Security in IEEE 802.11 Networks Mário Nunes, Rui Silva, António Grilo March 2013 Sumário 1 Introduction to the Security Services 2 Basic security mechanisms in IEEE 802.11 2.1 Hidden SSID (Service Set

More information

Introduction to Wireless Networking CS 490WN/ECE 401WN Winter 2007

Introduction to Wireless Networking CS 490WN/ECE 401WN Winter 2007 Introduction to Wireless Networking CS 490WN/ECE 401WN Winter 2007 Lecture 5: Wireless LANs and IEEE 802.11 Part III This lecture completes the study of wireless LANs, looking at the developing and security

More information

U S E R M A N U A L b/g PC CARD

U S E R M A N U A L b/g PC CARD U S E R M A N U A L 802.11b/g PC CARD Table of Content CHAPTER 1 INTRODUCTION... 1 1.1 WIRELESS LAN FEATURE FUNCTIONS... 1 1.2 REGULATORY NOTICE... 1 1.2.1 FCC Class B Statement...1 1.2.2 Canadian Regulatory

More information

CSCD 433 Network Programming Fall Lecture 7 Ethernet and Wireless

CSCD 433 Network Programming Fall Lecture 7 Ethernet and Wireless CSCD 433 Network Programming Fall 2016 Lecture 7 Ethernet and Wireless 802.11 1 Topics 802 Standard MAC and LLC Sublayers Review of MAC in Ethernet MAC in 802.11 Wireless 2 IEEE Standards In 1985, Computer

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

Mohamed Khedr.

Mohamed Khedr. Mohamed Khedr http://webmail.aast.edu/~khedr Tentatively Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Week 14 Week 15 Overview Packet Switching IP addressing

More information

Power WLAN. Plug-in. Internet DSL. Power Ethernet USB. DSL Internet. Voice. Thomson Gateway Wireless Configuration Guide

Power WLAN. Plug-in. Internet DSL. Power Ethernet USB. DSL Internet. Voice. Thomson Gateway Wireless Configuration Guide Power Ethernet WLAN Plug-in ISDN DSL Internet Ethernet Power DSL WLAN USB Voice Internet Thomson Gateway Wireless Configuration Guide Thomson Gateway Wireless Configuration Guide Copyright Copyright 1999-2007

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

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

WNC-0300USB. 11g Wireless USB Adapter USER MANUAL

WNC-0300USB. 11g Wireless USB Adapter USER MANUAL WNC-0300USB 11g Wireless USB Adapter USER MANUAL Contents 1. Introduction...3 1.1 Product Feature...3 1.2 System Requirement...3 2. Getting Start...3 2.1 LED Indicators...3 2.2 Install the 54Mbps Wireless

More information

Vehicle Networks. Wireless Local Area Network (WLAN) Univ.-Prof. Dr. Thomas Strang, Dipl.-Inform. Matthias Röckl

Vehicle Networks. Wireless Local Area Network (WLAN) Univ.-Prof. Dr. Thomas Strang, Dipl.-Inform. Matthias Röckl Vehicle Networks Wireless Local Area Network (WLAN) Univ.-Prof. Dr. Thomas Strang, Dipl.-Inform. Matthias Röckl Outline Wireless LAN Overview History IEEE 802.11-1997 MAC implementations PHY implementations

More information

Page 1. Wireless LANs: Design Requirements. Evolution. EEC173B/ECS152C, Winter Wireless LANs

Page 1. Wireless LANs: Design Requirements. Evolution. EEC173B/ECS152C, Winter Wireless LANs EEC173B/ECS152C, Winter 2006 Wireless LANs Evolution of Technology & Standards IEEE 802.11 Design Choices Architecture & Protocols PHY layer MAC layer design Acknowledgment: Selected slides from Prof.

More information

Data and Computer Communications

Data and Computer Communications Data and Computer Communications Chapter 17 Wireless LANs Eighth Edition by William Stallings Overview of Wireless LANs use wireless transmission medium Wireless LAN were little used issues of high prices,

More information

Page 1. Outline : Wireless Networks Lecture 11: MAC. Standardization of Wireless Networks. History. Frequency Bands

Page 1. Outline : Wireless Networks Lecture 11: MAC. Standardization of Wireless Networks. History. Frequency Bands Outline 18-759 : Wireless s Lecture 11: 80.11 Peter Steenkiste Dina Papagiannaki Spring Semester 009 http://www.cs.cmu.edu/~prs/wireless09/ Peter A. Steenkiste, CMU 1 80 protocol overview Wireless LANs

More information

Overview. Wireless networks basics IEEE (Wi-Fi) a/b/g/n ad Hoc MAC protocols ad Hoc routing DSR AODV

Overview. Wireless networks basics IEEE (Wi-Fi) a/b/g/n ad Hoc MAC protocols ad Hoc routing DSR AODV Wireless networks 1 Overview Wireless networks basics IEEE 802.11 (Wi-Fi) a/b/g/n ad Hoc MAC protocols ad Hoc routing DSR AODV 2 Wireless Networks Autonomous systems of mobile hosts connected by wireless

More information

ECE442 Communications Lecture 3. Wireless Local Area Networks

ECE442 Communications Lecture 3. Wireless Local Area Networks ECE442 Communications Lecture 3. Wireless Local Area Networks Husheng Li Dept. of Electrical Engineering and Computer Science Spring, 2014 Wireless Local Networks 1 A WLAN links two or more devices using

More information

A Configuration Protocol for Embedded Devices on Secure Wireless Networks

A Configuration Protocol for Embedded Devices on Secure Wireless Networks A Configuration Protocol for Embedded Devices on Secure Wireless Networks Larry Sanders lsanders@ittc.ku.edu 6 May 2003 Introduction Wi-Fi Alliance Formally Wireless Ethernet Compatibility Alliance (WECA)

More information

Nomadic Communications WLAN MAC Fundamentals

Nomadic Communications WLAN MAC Fundamentals Nomadic Communications WLAN 802.11 MAC Fundamentals Renato Lo Cigno ANS Group locigno@disi.unitn.it http://disi.unitn.it/locigno/index.php/teaching-duties/nomadic-communications Copyright Quest opera è

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