Mobile Radio Communications
|
|
- Isaac Tucker
- 6 years ago
- Views:
Transcription
1 Session 7: Wireless networks & WLANs Session 7, page 1
2 Backbone network MSC PSTN PLMN BSC Session 7, page 2
3 Public switched telephone network (PSTN) PABX central office local exchange long distance subscriber loop central office SWITCH Session 7, page 3
4 Signaling formats PCM (8 ks/s, 8b/sample, logpcm, µ-law/a-law) TDM US/Japan Europe (CEPT&PTTs) signal level bit rate voice circuits carrier system DS-0 64 kb/s 1 DS Mb/s 24 T-1 DS-1C Mb/s 48 T-1C DS Mb/s 96 T-2 DS Mb/s 672 T-3 DS Mb/s 4032 T kb/s Mb/s 30 E Mb/s 120 E-1C Mb/s 480 E Mb/s 1920 E Mb/s 7680 E-4 Session 7, page 4
5 Traffic routing Real-time information (voice/video) Non real-time information (data) Priority delivery Best effort delivery Connection-oriented services single, (virtual) path call set-up procedure delivery in sequence order Connectionless services different paths (datagram) always on-line delivery order not guaranteed Session 7, page 5
6 Traffic routing Connection-oriented service Connectionless service Session 7, page 6
7 Circuit switching Reserved circuits Constant bandwidth Connection-oriented Telephony paradigm SWITCH SWITCH Session 7, page 7
8 Packet switching Packet transmission Variable bandwidth Connection-oriented (ATM) or connectionless Data paradigm ROUTER ROUTER Session 7, page 8
9 Routing and switching circuit packet Connection-oriented PSTN ATM Connectionless Ethernet Session 7, page 9
10 Connectionless packet data header Information field FCS flag destination address source address control Session 7, page 10
11 Fixed line protocols PSTN (or POTS: Plain Old Telephone Service) ISDN (Integrated Services Digital Network) B-channels (64 kb/s) D-channels (16 kb/s for BRI, 64 kb/s for PRI) Basic Rate Interface: 2B+D Primary Rate Interface: 23B+D (US/Japan) or 30B+D (Europe) ATM (Asynchronous Transfer Mode) ATM cells: 53 bytes (5-byte header, 48-byte payload) connection-oriented (virtual circuit), routing labels Session 7, page 11
12 Common channel signaling Separate signaling traffic (control) from user traffic out-of-band signaling Signaling System No.7 (SS7) node C voice control node A node B Session 7, page 12
13 Mobile switching system Mobility Routing Resource allocation Billing AUC EIR voice control PSTN HLR ISDN PLMN GMSC MSC BSC (MTSO) VLR Session 7, page 13
14 Mobile switching system GPRS: General Packet Radio System SGSN: Serving GPRS Support Node GGSN: Gateway GPRS Support Node ISP network A ISP network B Corp. network GGSN HLR SGSN data control GMSC (MTSO) MSC VLR BSC Session 7, page 14
15 Single channel (medium) Packet radio Multiple users access same medium medium access control (MAC) uncoordinated random access contention based collisions coordinated scheduled access contention free (reserved) hybrid (combination of contention and contention-free) push-to-talk Session 7, page 15
16 Throughput τ Constant packet length τ seconds Fixed data rate Random packet generation λ packets/s Poisson arrival distribution 2τ vulnerable period R = λ τ T ch Pr Pr = λ τ Pr( no collision ) ( n arrivals within τ ) = R R ( 0 arrivals within τ ) = e e n! n R Session 7, page 16
17 Pure ALOHA: Random access at any time Vulnerable period 2τ Collision probability Throughput ALOHA Pr T ch 2 R ( within 2τ ) = e 0 arrivals 2 R = R e Slotted ALOHA: Random access at slot boundary only Vulnerable period τ Collision probability Throughput Pr T R ( within τ ) = e ch 0 arrivals R = R e Session 7, page 17
18 Througput ALOHA throughput traffic load R Session 7, page 18
19 Carrier sense: CSMA protocols Listen to channel Retry after random delay CSMA/CD: Collision Detect Listen-while-talk Not for radio CSMA/CA: Collision Avoidance Listen-before-talk Session 7, page 19
20 CSMA/CA Carrier sense, collision aviodance: Listen to channel If busy, retry after random delay listen listen listen t τ 3 listen listen listen t τ 1 τ 2 Session 7, page 20
21 Wireless extensions PSTN: DECT LAN: WLANs Ethernet: WLAN ATM: HIPERLAN/2 PSTN Session 7, page 21
22 WLAN IEEE PHY and MAC description PHY: Infrared Frequency-Hop Spread-Spectrum (FHSS) Direct-Sequence Spread-Spectrum (DSSS) Three flavours GHz, 1-2 Mb/s b 2.4 GHz, 11 Mb/s a 5 GHz, 20 + Mb/s Developed under IEEE 802 Session 7, page 22
23 Architecture Extended Service Set (ESS) Backbone: Ethernet, token ring, token bus server DS AP AP BSS BSS STA STA STA Session 7, page 23
24 Physical layer Radio band MHz, Industrial-Scientific-Medical (ISM) unlicensed band FH spread spectrum 79 hop frequencies, 1 MHz spacing 2-level GFSK (1 Mb/s) and 4-level GFSK (2 Mb/s) 3 hop sets, each set with 26 sequences of 79 hops DS spread spectrum DBPSK (1 Mb/s) and DQPSK (2Mb/s) 11-chip Barker spreading code 11 MHz wide channels (MC) 2 channels per BSS Wavelenghts nm Infrared Pulse Position Modulation Session 7, page 24
25 Medium access control layer Channel access Addressing Frame formatting Error checking Fragmentation/re-assembly Session 7, page 25
26 Channel access Packet radio multi-carrier ESS single channel per BSS Distributed control (DCF) best effort services CSMA/CA Centralized control (PCF) Priority delivery Point coordinator (AP) Polling scheme Session 7, page 26
27 MAC frame CTRL DURATION ADDRESS PAYLOAD FCS CTRL type, direction, mode, etc. Duration time duration of transaction (NAV update, virtual carrier sense) Address source & destination Payload MAC protocol data unit (MPDU) FCS CRC Session 7, page 27
28 DCF data transaction Contend for channel RTS CTS Send MPDU ACK respond NAK stop-and-wait ARQ Session 7, page 28
29 Hidden node problem STA_C hears STA_B, but not does not hear STA_A RTS/CTS reserves channel in area around A and B RTS CTS STA_A STA_B STA_C Session 7, page 29
30 DCF data transaction DIFS SIFS SIFS SIFS DIFS SRC RTS MPDU t DST CTS ACK NAV (RTS) NAV (CTS) NAV (MSDU) Session 7, page 30
31 Fragmentation DIFS SIFS SIFS SIFS SIFS SIFS DIFS SRC RTS Frag.1 Frag.2 t DST CTS ACK ACK NAV Session 7, page 31
32 PCF data transaction CFP CP B PCF DCF B PCF t Beacons sent by AP Contention-free-period: Polling PIFS priority data Session 7, page 32
33 HIPERLAN HIgh PErformance Radio Local Area Network System description (including mobility) Hot-spot fill for cellular Two flavours type 1 similar to type 2 cellular based Developed under ETSI BRAN Session 7, page 33
34 Architecture Cellular network topology Backbone: originally ATM server AP AP MT MT MT Session 7, page 34
35 Physical layer MHz and MHz, license-exempt band TDMA/TDD MAC frames uplink/downlink slots Multi Carrier 20 MHz spacing Orthogonal Frequency Division Multiplexing (DM) 52 subcarriers khz spacing 800ns cyclic prefix Session 7, page 35
36 DM 1. Serial-to-parallel conversion 2. Send in parallel each bit on narrowband subcarrier 3. Keep subcarriers orthogonal 4. Demodulate each subcarrier separately and retrieve bits 5. Parallel-to-serial conversion Session 7, page 36
37 Parallel transmission mod demod S/P ω 0 ω 0 ω 1 ω 1 P/S ω N-1 ω N-1 Session 7, page 37
38 T 0 Orthogonality () t () t φ i φ j dt = 1 0 if i=j if i j Choose φ(t) to be cos(k ω 0 t) and sin(k ω 0 t) 1 T s T s 0 cos 2π k t T s cos 2π n t T s dt = 1 0 if n=k if n k Mapping is Fourier transform Session 7, page 38
39 DM T s =2π/ω 0 b 0 b 1 b 2 b 3 b 0 b 1 f b 2 subcarriers b 3 b i I i cos(kω 0 t) + Q i sin(kω 0 t) any from BPSK to 64QAM Session 7, page 39
40 Fast Fourier transforms mod demod S/P ω 0 ω 0 IFFT FFT ω 1 ω 1 P/S ω N-1 ω N-1 Session 7, page 40
41 Multipath resistant Long symbol time (narrowband subband) s(t) T s s(t) s(t-τ) a τ s(t-τ) τ Q No symbol distortion I Session 7, page 41
42 Cyclic prefix 800ns prefix 250ns T rms orthogonal within T s prefix 1 0 s(t) a τ s(t-τ) τ T s T s T s Session 7, page 42
43 HIPERLAN/2 DM 64-point FFT 312.5kHz subcarrier spacing 20 MHz carrier spacing 48 data subcarriers 4 pilot subcarrier 12 guard subcarriers f f 0 =312.5 khz 20 MHz Session 7, page 43
44 HIPERLAN/2 rates Subcarrier modulation BPSK/QPSK/16QAM/64QAM Coding, convolutional 1/2, 3/4, 9/16 rates, constraint length 7 Example: Subcarrier spacing = 312.5kHz T s = 3.2µs prefix 800ns: T s = 4µs Effective rate/subcarrier = 250ks/s 48 subcarriers 12 Ms/s gross rate QPSK, 3/4-rate convolutional code data rate = 12Msym/s 2b/sym 3/4 = 18Mb/s Session 7, page 44
45 HIPERLAN/2 rates mode modulation code rate data rate (Mb/s) BPSK BPSK QPSK QPSK 16QAM 16QAM 64QAM 1/2 3/4 1/2 3/4 9/16 3/4 3/ Session 7, page 45
46 MAC frame structure Fixed-length MAC frames AP controls traffic flows (including in direct mode) MAC frame MAC frame MAC frame contention free BCH FCH ACH downlink uplink RCH RCH contention 9B 54B SCH SCH SCH LCH LCH SCH header data unit crc Session 7, page 46
47 DLC layer Control BCH: broadcast information (radio resource control) FCH: frame information: allocation of downlink/uplink/rch ACH: access feedback control for MT requests RCH: random access, contention based SCH: short transport channel for control in payload Traffic SCH: long transport channel for uplink/downlink user data Downlink data from AP to MTs BCH/FCH/ACH Uplink data from MTs to AP RCH Session 7, page 47
48 Channel allocation Downlink Scheduling by AP allocation of downlink SCH/LCH by AP Uplink MT initiated (contention based): 1. RCH ACH/FCH 2. Allocation of uplink SCH/LCH by AP AP initiated (contention free): 1. Polling of MT by AP 2. Return request SCH by MT 3. Allocation of uplink SCH/LCH by AP Allocation indicated in FCH Session 7, page 48
49 Radio network functions Dynamic frequency selection (DFS) - uncoordinated selection of DM carrier - interference measurements in AP and MT Link adaptation - changing coding scheme - changing modulation scheme Power control Quality of service - synchronous/isochronous services - polling by AP Session 7, page 49
50 FOR NEXT TIME Read: Chapter 10: (not ), Solve problems: Chapter 9: none Session 7, page 50
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 informationChapter 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 informationTopics 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 informationMSIT 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 informationIEEE 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 informationData 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 informationstandard. 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 informationFunctions of physical layer:
Chapter 14 Functions of physical layer: Encoding/decoding of signals Preamble generation/removal (for synchronization) Bit transmission/reception Includes specification of the transmission medium Functions
More informationoriginal 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 informationInvestigation 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 informationChapter 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 informationWireless 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 informationWireless 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 information04/11/2011. 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 informationComputer 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 informationWireless 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 informationLecture 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 informationCSC344 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 informationOverview 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 informationWireless 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 informationMobile 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 informationVehicle 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 informationAdvanced 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 informationHands-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 informationIEEE 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 information3.1. 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 informationLocal 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 informationICE 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 informationOverview : 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 informationWireless Local Area Network. Internet Protocol Suite
Wireless Local Area Network Internet Protocol Suite Application layer File transfer protocol Telnet Hypertext transfer protocol Transport layer Network layer Host-tonetwork layer User datagram protocol
More informationInternet Structure. network edge:
Midterm Review Internet Structure network edge: Hosts: clients and servers Server often in data centers access networks, physical media:wired, wireless communication links network core: interconnected
More informationAnalysis of IEEE e for QoS Support in Wireless LANs
Analysis of IEEE 802.11e for QoS Support in Wireless LANs Stefan Mangold, Sunghyun Choi, Guido R. Hiertz, Ole Klein IEEE Wireless Communications, December 2003 Presented by Daeseon Park, Student No.2005-30231
More informationWireless 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 informationWireless 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 informationMultiple Access Links and Protocols
Multiple Access Links and Protocols Two types of links : point-to-point PPP for dial-up access point-to-point link between Ethernet switch and host broadcast (shared wire or medium) old-fashioned Ethernet
More informationWireless LAN A competing method to wired LAN. Course: Wireline Communication Instructor: Prof. Werner Henkel Student: Chin Yung Lu
Wireless LAN A competing method to wired LAN Course: Wireline Communication Instructor: Prof. Werner Henkel Student: Chin Yung Lu Outline of the presentation Introduction Background Problem Environment
More informationThe IEEE standard
The IEEE 802.11 standard Imad Aad INRIA, Planete team IN Tech, January 24th, 2002 IEEE 802.11 p.1 Outline WLANs vs. Wired LANs History Working modes MAC sub-layer The PHY layer (1997) The PHY Extensions
More informationAdvanced Computer Networks. WLAN, Cellular Networks
Advanced Computer Networks 263 3501 00 WLAN, Cellular Networks Patrick Stuedi Spring Semester 2013 Oriana Riva, Department of Computer Science ETH Zürich Last week Medium Access COPE Today Last week Short
More informationData 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 informationMobile & 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 informationWireless 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 informationWireless Data Networking IEEE & Overview of IEEE b
Wireless Data Networking IEEE 802.11 & Overview of IEEE 802.11b Dr. Arian Durresi The Ohio State University Columbus, OH 43210 durresi@cis.ohio-state.edu 1 Overview Wireless Application Market Wireless
More informationWireless Local Area Part 2
Wireless Local Area Part 2 BER 802.11: advanced capabilities Rate Adaptation base station, mobile dynamically change transmission rate (physical layer modulation technique) as mobile moves, SNR varies
More informationWiFi 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 informationWireless 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 informationAnnouncements : Wireless Networks Lecture 11: * Outline. Power Management. Page 1
Announcements 18-759: Wireless Networks Lecture 11: 802.11* Please mail survey team information» Can include topic preferences now if you have them Submit project designs through blackboard Homework 2
More informationData 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 informationWireless 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 informationMobile 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/
More informationWireless 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 informationGuide 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 informationMultiple Access Links and Protocols
Multiple Access Links and Protocols Two types of links : point-to-point PPP for dial-up access point-to-point link between Ethernet switch and host broadcast (shared wire or medium) old-fashioned Ethernet
More informationMultiple 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 informationWLAN 1 IEEE Basic Connectivity. Manuel Ricardo. Faculdade de Engenharia da Universidade do Porto
WLAN 1 IEEE 802.11 Basic Connectivity Manuel Ricardo Faculdade de Engenharia da Universidade do Porto WLAN 2 Acknowledgements Based on Jochen Schiller slides Supporting text» Jochen Schiller, Mobile Comunications,
More informationMobile 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 informationMohamed 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 informationMultimedia Communication Services Traffic Modeling and Streaming
Multimedia Communication Services Traffic Modeling and Streaming Medium Access Control algorithms Introduction to IEEE 802.11 Università degli Studi di Brescia A.A. 2014/2015 Francesco Gringoli Master
More informationUnit 7 Media Access Control (MAC)
Unit 7 Media Access Control (MAC) 1 Internet Model 2 Sublayers of Data Link Layer Logical link control (LLC) Flow control Error control Media access control (MAC) access control 3 Categorization of MAC
More informationIntroduction. 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 informationModule 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 informationWLAN 1 IEEE Manuel Ricardo. Faculdade de Engenharia da Universidade do Porto
WLAN 1 IEEE 802.11 Basic Connectivity Manuel Ricardo Faculdade de Engenharia da Universidade do Porto WLAN 2 Acknowledgements Based on Jochen Schiller slides Supporting text» Jochen Schiller, Mobile Comunications,
More informationInstitute 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 informationCSC 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 informationLocal Area Networks. Lecture 17 Fall Token Ring and FDDI
Local Area Networks Lecture 17 Fall 2010 Token Ring and FDDI IEEE 802.5 Ring LAN Unidirectional ring network 4 Mbps and 16 Mbps on twisted pair Differential Manchester line coding Token passing protocol
More informationOverview. 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 informationLecture 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 informationLecture 25: CSE 123: Computer Networks Alex C. Snoeren. HW4 due NOW
Lecture 25: 802.11 CSE 123: Computer Networks Alex C. Snoeren HW4 due NOW Lecture 25 Overview 802.11 Wireless PHY layer overview Hidden Terminals Basic wireless challenge RTS/CTS Virtual carrier sense
More informationIEEE or ETSI BRAN HIPERLAN/2: Who will win the race for a high speed wireless LAN standard?
IEEE 802.11 or ETSI BRAN HIPERLAN/2: Who will win the race for a high speed wireless LAN standard? Andreas Hettich and Matthias Schröther Communication Networks Aachen University of Technology E-Mail:
More informationShared 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 informationPage 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 informationPage 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 informationEnabling Technologies
Enabling Technologies Part 4 Mobile Ad Hoc Networking Wuhan University Why Enable? Reliable point-to-point communication via media access control (MAC) Challenges in medium share Categories of MAC protocols
More informationChapter 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 informationChapter 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 informationMedium 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 informationMobile 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 Characteristics of Wireless LANs
More informationLesson 2-3: The IEEE x MAC Layer
Module 2: Establishing Wireless Connectivity Lesson 2-3: The IEEE 802.11x MAC Layer Lesson Overview This lesson describes basic IEEE 802.11x MAC operation, beginning with an explanation of contention schemes
More informationOutline. 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 informationHIPERLAN/2 and a: A Comparative Study
HIPERLAN/2 and 802.11a: A Comparative Study PADMA BONDE Reader, Department of Computer Science Shri Vaishnav Institute of Technology and Science Indore, INDIA JAYESH BONDE Executive Engineer, Department
More informationLecture 24: CSE 123: Computer Networks Stefan Savage. HW4 due NOW
Lecture 24: 802.11 CSE 123: Computer Networks Stefan Savage HW4 due NOW About the final Similar in style to midterm Some combination of easy questions, short answer and more in-depth questions Sample final
More informationChapter 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 informationLaboratory of Nomadic Communication. Quick introduction to IEEE
Laboratory of Nomadic Communication Quick introduction to IEEE 802.11 Let s play 802.11 game Wireless LAN Standard A quick introduction to the IEEE 802.11 standard IEEE 802.11 standard! Definition of wireless
More informationMobile 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 informationIEEE 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 informationSEN366 (SEN374) (Introduction to) Computer Networks
SEN366 (SEN374) (Introduction to) Computer Networks Prof. Dr. Hasan Hüseyin BALIK (11 th Week) Wireless LANs 11.Outline Overview IEEE 802.11 Architecture and Services IEEE 802.11 Medium Access Control
More information02/21/08 TDC Branch Offices. Headquarters SOHO. Hot Spots. Home. Wireless LAN. Customer Sites. Convention Centers. Hotel
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
More informationIEEE Technical Tutorial. Introduction. IEEE Architecture
IEEE 802.11 Technical Tutorial Introduction The purpose of this document is to give technical readers a basic overview of the new 802.11 Standard, enabling them to understand the basic concepts, principle
More informationWireless Networking & Mobile Computing
Wireless Networking & Mobile Computing CS 752/852 - Spring 2012 Lec #4: Medium Access Control - II Tamer Nadeem Dept. of Computer Science IEEE 802.11 Standards Page 2 Spring 2012 CS 752/852 - Wireless
More informationMSIT 413: Wireless Technologies Week 9
MSIT 413: Wireless Technologies Week 9 Michael L. Honig Department of EECS Northwestern University March 2017 Schedule for Today Finish discussion of random access Core networking; mobility management
More informationIEEE 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 informationComputer Communication III
Computer Communication III Wireless Media Access IEEE 802.11 Wireless LAN Advantages of Wireless LANs Using the license free ISM band at 2.4 GHz no complicated or expensive licenses necessary very cost
More informationData 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 informationMedium Access Control Sublayer
Wireless (WLAN) Medium Access Control Sublayer Mahalingam Mississippi State University, MS October 20, 2014 Outline Medium Access Protocols Wireless (WLAN) 1 Medium Access Protocols ALOHA Slotted ALOHA
More informationWireless Communication Session 4 Wi-Fi IEEE standard
Wireless Communication Session 4 Wi-Fi IEEE802.11 standard M. Daneshvar Farzanegan Soourosh.blogfa.com smdanesh@yahoo.com 1 Reminder on frequencies and wavelenghts twisted pair coax cable optical transmission
More informationWIRELESS 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 informationWireless# 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 informationMohammad Hossein Manshaei 1393
Mohammad Hossein Manshaei manshaei@gmail.com 1393 1 802.11 History and Standardization 802.11 Architectures and Layers 802.11 Frame Format and Addressing 802.11 Mac Layer (CSMA/CA) 2 Wifi 3 twisted pair
More informationOutline / 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 informationWNC-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 informationWireless 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