CS541 Advanced Networking 1 Basics of Wireless Networking Neil Tang 1/21/2009.

Slides:

Advertisements

Similar presentations

Networks: Wireless LANs1 Wireless Local Area Networks.

Advertisements

Ethernet, Wireless LAN. Ethernet Frame Format (a) DIX Ethernet, (b) IEEE

© Kemal AkkayaWireless & Network Security 1 Department of Computer Science Southern Illinois University Carbondale CS591 – Wireless & Network Security.

Comp 361, Spring 20056:Basic Wireless 1 Chapter 6: Basic Wireless (last updated 02/05/05) r A quick intro to CDMA r Basic

6: Wireless and Mobile Networks6-1 Chapter 6 Wireless and Mobile Networks A note on the use of these ppt slides: We’re making these slides freely available.

Overview r Ethernet r Hubs, bridges, and switches r Wireless links and LANs.

Energy-efficient Wireless MAC Protocol CS Wireless Communications & Networks Summer II 2003 Dr. Ajay Gupta Serhat Kucukomeroglu & Weng Liong.

Networks: Wireless LANs1 Wireless Local Area Networks.

KING FAHD UNIVIRSITY OF PETROLEUM AND MIERALS ELECTRICAL ENGINEERING DEPARTMENT MAC Protocols in ad hoc networks Rami Bakhsh Mohammed Al-Farsi.

Wireless Local Area Networks

20 – Collision Avoidance, : Wireless and Mobile Networks6-1.

Networks: Wireless LANs1 Wireless Local Area Networks.

1 Introduction to Wireless Networks Michalis Faloutsos.

6: Wireless and Mobile Networks6-1 Chapter 6: Wireless and Mobile Networks Background: r # wireless (mobile) phone subscribers now exceeds # wired phone.

1 Elements of a wireless network network infrastructure wireless hosts r laptop, PDA, IP phone r run applications r may be stationary (non- mobile) or.

CMPE 150- Introduction to Computer Networks 1 CMPE 150 Fall 2005 Lecture 18 Introduction to Computer Networks.

5-1 Data Link Layer r Wireless Networks m Wi-Fi (Wireless LAN) Example Problems m RTS/CTS.

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

5-1 Data Link Layer r What is Data Link Layer? r Wireless Networks m Wi-Fi (Wireless LAN) r Comparison with Ethernet.

8/7/20151 Mobile Computing COE 446 Wireless Multiple Access Tarek Sheltami KFUPM CCSE COE hthttp://faculty.kfupm.edu.sa/coe/tarek/coe446.htm Principles.

6: Wireless and Mobile Networks6-1 Elements of a wireless network network infrastructure wireless hosts r laptop, PDA, IP phone r run applications r may.

Chapter 6 Wireless and Mobile Networks Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 A note on.

6: Wireless and Mobile Networks6-1 Chapter 6 Wireless and Mobile Networks Computer Networking: A Top Down Approach Featuring the Internet, 3 rd edition.

ECE 4450:427/527 - Computer Networks Spring 2015

Wi-Fi Wireless LANs Dr. Adil Yousif. What is a Wireless LAN  A wireless local area network(LAN) is a flexible data communications system implemented.

Wireless LAN Simulation - IEEE MAC Protocol

Overview of Wireless LANs Use wireless transmission medium Issues of high prices, low data rates, occupational safety concerns, & licensing requirements.

MAC layer Taekyoung Kwon. Media access in wireless - start with IEEE In wired link, –Carrier Sense Multiple Access with Collision Detection –send.

Ethernet. Problem In an Ethernet, suppose there are three stations very close to each other, A, B and C. Suppose at time 0, all of them have a frame to.

Lecture 4 Wireless Medium Access Control

Computer and Data Communications Semester Mohd Nazri Mahmud Session 4a-12 March 2012.

Wireless Access avoid collisions: 2 + nodes transmitting at same time CSMA - sense before transmitting –don’t collide with ongoing transmission by other.

K. Salah 1 Chapter 15 Wireless LANs. K. Salah 2 Figure 15.1 BSSs IEEE Specification for Wireless LAN: IEEE , which covers the physical and data.

Wireless LAN Overview Sunggeun Jin Outline  IEEE MAC  IEEE MAC.

IEEE Wireless LAN Standard. Medium Access Control-CSMA/CA IEEE defines two MAC sublayers Distributed coordination function (DCF) Point coordination.

Min-Te Sun, Lifei Huang, Anish Arora, Ten-Hwang Lai Presented by Md Tareq Adnan CSE High Performance Computer Networks 1.

Wireless and Mobility The term wireless is normally used to refer to any type of electrical or electronic operation which is accomplished without the use.

Wireless LANs and PANs : Data Communication and Computer Networks Asst. Prof. Chaiporn Jaikaeo, Ph.D.

Lecture # 13 Computer Communication & Networks. Today’s Menu ↗Last Lecture Review ↗Wireless LANs ↗Introduction ↗Flavors of Wireless LANs ↗CSMA/CA Wireless.

Ch 14. Wireless LANs IEEE Specification for a wireless LAN – Cover physical and data link layers Basic service sets (BSS) and extended service.

Background of Ad hoc Wireless Networks Student Presentations Wireless Communication Technology and Research Ad hoc Routing and Mobile IP and Mobility Wireless.

Tackling Exposed Node Problem in IEEE Mac Deepanshu Shukla ( ) Guide: Dr. Sridhar Iyer.

WIRELESS COMMUNICATION Husnain Sherazi Lecture 1.

Wi-Fi. Basic structure: – Stations plus an access point – Stations talk to the access point, then to outside – Access point talks to stations – Stations.

Universität Karlsruhe Institut für Telematik ECE 591

An Energy-Efficient MAC Protocol for Wireless Sensor Networks Speaker: hsiwei Wei Ye, John Heidemann and Deborah Estrin. IEEE INFOCOM 2002 Page

Chapter 14 Wireless LANs.

MAC Sublayer MAC layer tasks: – Control medium access – Roaming, authentication, power conservation Traffic services – DCF (Distributed Coordination.

Medium Access Control in Wireless networks

Wireless Protocols. 2 Outline MACA 3 ISM: Industry, Science, Medicine unlicensed frequency spectrum: 900Mhz, 2.4Ghz, 5.1Ghz, 5.7Ghz.

CS541 Advanced Networking 1 Contention-based MAC Protocol for Wireless Sensor Networks Neil Tang 4/20/2009.

MAC Layer Protocols for Wireless Networks. What is MAC? MAC stands for Media Access Control. A MAC layer protocol is the protocol that controls access.

Network and Systems Laboratory nslab.ee.ntu.edu.tw Copyright © Wireless Sensor Networks: Zigbee Stack Polly Huang Department of Electrical.

1 Chapter 4 MAC Layer – Wireless LAN Jonathan C.L. Liu, Ph.D. Department of Computer, Information Science and Engineering (CISE), University of Florida.

Distributed-Queue Access for Wireless Ad Hoc Networks Authors: V. Baiamonte, C. Casetti, C.-F. Chiasserini Dipartimento di Elettronica, Politecnico di.

1 Effectiveness of Physical and Virtual Carrier Sensing in IEEE Wireless Ad Hoc Networks Fu-Yi Hung and Ivan Marsic WCNC 2007.

Copyright © 2003 OPNET Technologies, Inc. Confidential, not for distribution to third parties. Wireless LANs Session

IEEE Wireless LAN. Wireless LANs: Characteristics Types –Infrastructure based –Ad-hoc Advantages –Flexible deployment –Minimal wiring difficulties.

CS440 Computer Networks 1 Wireless LAN (IEEE ) Neil Tang 10/01/2008.

Wireless LAN Protocols This talk is based on the course: CPSC Networks and Distributed Processing Spring2006/

Wireless LAN Protocols This talk is based on the course: CPSC Networks and Distributed Processing Spring2006/

Outline What is Wireless LAN Wireless Transmission Types

Wireless LANs Wireless proliferating rapidly.

CS 457 – Lecture 7 Wireless Networks

Computer Communication & Networks

IEEE Wireless LAN wireless LANs: untethered (often mobile) networking

Wireless LAN Simulation IEEE MAC Protocol

Routing in Mobile Wireless Networks Neil Tang 11/14/2008

Presentation transcript:

CS541 Advanced Networking 1 Basics of Wireless Networking Neil Tang 1/21/2009

CS541 Advanced Networking 2 Outline  Wireless Communication Basics  Wireless Networks  Interference Model  IEEE MAC Protocols

CS541 Advanced Networking 3 Wireless Communications  There is no physical link in wireless networks. Signals are transmitted on a certain frequency, propagate in the space and are captured by the receiver tuned to the same frequency.  Wireless communication is normally broadcast communication, i.e., all nodes within the transmission range of a particular node can receive the transmitted packets.  Transmissions in a common neighborhood will interfere with each other. If the Signal-to-Interference-Noise-Ratio (SINR) in the receiver is large enough, a packet can be correctly decoded.

CS541 Advanced Networking 4 Wireless Networks  Single-hop wireless networks: cellular network, wireless LAN.  Multihop wireless networks: mobile ad hoc network, wireless mesh network, wireless sensor network.

CS541 Advanced Networking 5 Interference Model Primary Interference: ABC ABC ABC

CS541 Advanced Networking 6 Interference Model Protocol Model (for the fixed transmission power case): AB CD a b

CS541 Advanced Networking 7 Interference Model Physical Model (for the variable transmission power case):

CS541 Advanced Networking 8 MAC Protocol –  Basic architecture: Infrastructure mode and ad hoc mode  MAC protocol: CSMA/CA (MACA)

CS541 Advanced Networking 9 Basic Architecture AP Infrastructure mode Ad hoc mode

CS541 Advanced Networking 10 Hidden Terminal Problem Transmission Range A B C Node A and C are hidden terminals.

CS541 Advanced Networking 11 Exposed Terminal Problem Transmission Range A B CD Node A and B are exposed terminals.

CS541 Advanced Networking  Distributed Coordination Function (DCF) : Simple protocol with no centralized control.  Point Coordination Function (PCF): APs control medium access and provide collision-free communications. Bandwidth (timeslots) will be carefully allocated to nodes which has signed up for transmission.

CS541 Advanced Networking 13 DCF Basic Idea: CSMA/CA (MACA)  Request-To-Send (RTS) and Clear-To-Send (CTS) are used to reserve space and time for transmission.  Both physical and virtual carrier sensing are used to determine the time for transmission. Network Allocation Vector (NAV) is used for virtual carrier sensing.  For each transmitted data frame, an ACK frame will be sent back to from the sender. Stop-and-wait protocol are used to provide reliability.

CS541 Advanced Networking 14 DCF