EPL 657 Wireless communications introduction

Transcription

1 EPL 657 Wireless communications introduction Panayiotis Kolios, Dept. of Computer Science, UCY Adapted in part from Prof. Dr.-Ing. Jochen Schiller lecture notes 1

2 Early history of wireless communication Many people in history used light for communication heliographs, flags ( semaphore ), BC smoke signals for communication; (Polybius, Greece) 1794, optical telegraph, Claude Chappe Here electromagnetic waves are of special importance: 1831 Faraday demonstrates electromagnetic induction J. Maxwell ( ): theory of electromagnetic Fields, wave equations (1864) H. Hertz ( ): demonstrates with an experiment the wave character of electrical transmission through space

3 History of wireless communication I 1895 Guglielmo Marconi first demonstration of wireless telegraphy (digital!) long wave transmission, high transmission power necessary (> 200kw) 1907 Commercial transatlantic connections huge base stations (30 100m high antennas) 1915 Wireless voice transmission New York - San Francisco 1920 Discovery of short waves by Marconi reflection at the ionosphere smaller sender and receiver, possible due to the invention of the vacuum tube (1906, Lee DeForest and Robert von Lieben) 1922 Early attempts for a mobile phone Train-phone on the line Hamburg - Berlin wires parallel to the railroad track

4 History of wireless communication II 1928 many TV broadcast trials (across Atlantic, color TV, TV news) 1933 Frequency modulation, FM (E. H. Armstrong) 1958 Mobile telephony, A-Netz in Germany analog, 160MHz, connection setup only from the mobile station, no handover, 80% coverage, customers 1972 Mobile Telephony, B-Netz in Germany analog, 160MHz, connection setup from the fixed network too (but location of the mobile station has to be known) available also in A, NL and LUX, customer in D 1979 NMT at 450MHz (Scandinavian countries) 1982 Start of GSM-specification goal: pan-european digital mobile phone system with roaming 1983 Start of the American AMPS (Advanced Mobile Phone System, analog) 1984 CT-1 standard (Europe) for cordless telephones

5 History of wireless communication III 1986 C-Netz in Germany analog voice transmission, 450MHz, hand-over possible, digital signaling, automatic location of mobile device Was in use until 2000, services: FAX, modem, X.25, , 98% coverage 1991 Specification of DECT Digital European Cordless Telephone (today: Digital Enhanced Cordless Telecommunications) MHz, ~ m range, 120 duplex channels, 1.2Mbit/s data transmission, voice encryption, authentication, up to several user/km 2, used in more than 50 countries 1992 Start of GSM in D as D1 and D2, fully digital, 900MHz, 124 channels automatic location, hand-over, cellular roaming in Europe - now worldwide in more than 170 countries services: data with 9.6kbit/s, FAX, voice,...

6 History of wireless communication IV 1996 HiperLAN (High Performance Radio Local Area Network) ETSI, standardization of type 1: GHz, 23.5Mbit/s recommendations for type 2 and 3 (both 5GHz) and 4 (17GHz) as wireless ATM-networks (up to 155Mbit/s) 1997 Wireless LAN - IEEE IEEE standard, GHz and infrared, 2Mbit/s already many (proprietary) products available in the beginning 1998 Specification of GSM successors for UMTS (Universal Mobile Telecommunication System) as European proposals for IMT-2000 Iridium 66 satellites (+6 spare), 1.6GHz to the mobile phone

7 History of wireless communication V 1999 Standardization of additional wireless LANs IEEE standard b, GHz, 11Mbit/s Bluetooth for piconets, 2.4Ghz, <1Mbit/s Decision about IMT-2000 Several members of a family : UMTS, cdma2000, DECT, Start of WAP (Wireless Application Protocol) and i-mode First step towards a unified Internet/mobile communication system Access to many services via the mobile phone 2000 GSM with higher data rates HSCSD offers up to 57,6kbit/s, First GPRS trials up to 50 kbit/s (packet oriented!) UMTS auctions/beauty contests Hype followed by disillusionment (approx. 50 B$ payed in Germany for 6 UMTS licences!) ~ 2000 sensor networks research frenzy 2001 Start of 3G systems Cdma2000 in Korea, UMTS in Europe, Foma (almost UMTS) in Japan Commercial deployment of 3G becomes widespread 4G widely talked LTE deployment

8 Wireless systems: overview of the development 1981: NMT : NMT 900 cellular phones 1992: GSM analogue digital 1994: DCS : CDMA 2000: GPRS 1983: AMPS 1991: D-AMPS 1993: PDC 2001: IMT G fourth generation: when and how? 1982: Inmarsat-A 1988: Inmarsat-C satellites 1992: Inmarsat-B Inmarsat-M 1998: Iridium cordless phones 1980: CT0 1984: CT1 1987: CT : CT 2 202?: Fourth Generation (Internet based-all-ip) wireless LAN 1991: DECT 199x: proprietary 1997: IEEE : b, Bluetooth 2000: IEEE a New technologies: Sensor, WiMAX, Wireless Mesh Circa 2000: initial research and standards

9 Foundation: ITU-R - Recommendations for IMT-2000 M M M.817 M M M M.1035 M.1036 IMT-2000 concepts and goals framework for services IMT-2000 network architectures satellites in IMT-2000 IMT-2000 for developing countries requirements for the radio interface(s) framework for radio interface(s) and radio sub-system functions spectrum considerations M.1078 security in IMT-2000 M.1079 speech/voiceband data performance M.1167 framework for satellites M.1168 framework for management M.1223 evaluation of security mechanisms M.1224 vocabulary for IMT-2000 M.1225 evaluation of transmission technologies...

10 Constituent components include: devices networks and networking techniques applications standards.

11 Mobile/Wireless devices: Then and now Now 11

12 Mobile devices Pager receive only tiny displays simple text messages PDA simpler graphical displays character recognition simplified WWW Laptop fully functional standard applications Sensors, and embedded controllers Mobile phones voice, data simple graphical displays Palmtop tiny keyboard simple versions of standard applications performance Plethora of interoperable/interconnected devices 12

13 Mobile/wireless networks in a typical application: road traffic UMTS, WLAN, DAB, GSM, cdma2000, TETRA,... Personal Travel Assistant, DAB, PDA, laptop, GSM, UMTS, WLAN, Bluetooth, sensor networks,... Several wireless heterogeneous networks coexisting 13

14 Mobile and wireless services Always Best Connected leading to 4 th Generation networks LAN, WLAN 780 kbit/s GSM 53 kbit/s Bluetooth 500 kbit/s UMTS, GSM 115 kbit/s LAN 100 Mbit/s, WLAN 54 Mbit/s UMTS, DECT 2 Mbit/s GSM/EDGE 384 kbit/s, WLAN 780 kbit/s GSM 115 kbit/s, WLAN 11 Mbit/s UMTS, GSM 384 kbit/s 14

15 Overlay Networks - the global goal Anywhere-anytime access integration of heterogeneous fixed and mobile networks with varying transmission characteristics regional vertical handover metropolitan area campus-based horizontal handover in-house 15

16 Plethora of Applications! Ambient intelligence enabler Vehicles transmission of news, road condition, weather, music via DAB personal communication using GSM position via GPS local ad-hoc network with vehicles close-by to prevent accidents, guidance system, redundancy vehicle data (e.g., from busses, high-speed trains) can be transmitted in advance for maintenance Emergencies early transmission of patient data to the hospital, current status, first diagnosis replacement of a fixed infrastructure in case of earthquakes, hurricanes, fire, crisis, war,... 16

17 Plethora of Applications II Smart homes Healthcare networks Travelling salesmen direct access to customer files stored in a central location consistent databases for all agents mobile office Replacement of fixed networks remote sensors, e.g., weather, earth activities flexibility for trade shows LANs in historic buildings Entertainment, education,... outdoor Internet access intelligent travel guide with up-to-date location dependent information ad-hoc networks for multi user games 17

18 Location dependent services Location aware services what services, e.g., printer, fax, phone, server etc. exist in the local environment Follow-on services automatic call-forwarding, transmission of the actual workspace to the current location Information services push : e.g., current special offers in the supermarket pull : e.g., where is the Black Forrest Cherry Cake? Support services caches, intermediate results, state information etc. follow the mobile device through the fixed network Privacy who should gain knowledge about the location 18

19 New networking directions WLANs already part of most business WiMAX (or similar WMAN) and Wireless Mesh currently being shaped for deployment. A promising WMAN technology (there was even talk about competing with 3G) 3G+ (HSDPA, HSPA) already being commercially deployed LTE+ (Long Term Evolution) is well on its way These technologies are leading to 4 th Generation (all-ip) networks) Ad-hock and sensor networks, incl. VANETS are a breed of networks where topology, as well as network stack have challenged the limits, and even gone beyond Network topology is not fixed, and can be mobile Traditional network stack is probably not the best approach to design these networks Autonomic networks and cross layer feedback are two new areas of research Nanonetworks Ambient intelligence enablers (Internet/Web of Things) 19

20 New directions: Internet of Services, Service Web 20

21 New directions: Internet/Web of Things 21

22 SUPPLEMENTARY 22

23 New directions: Networks of the Future 23

24 Nortel view 24

25 WSN Communication Architecture Remote Client Base station / Gateway Internet Mobility or node failure can cause major topological changes Sensor nodes 25

26 example sensor nodes Fixed sensor nodes Crossbow Mica2 Crossbow Mica2Dot Crossbow MicaZ Mobile sensor nodes Parallax BOE-Bot Parallax BOE-Bot Tank Parallax BOE-Bot with gripper 26 26

27 Meshed networking trends _ Radio relay (mesh) networks are gathering momentum many are based on WLAN (WiFi), WiMax (emerging) radio technology and therefore have a low cost base back-haul is considerably less than for conventional cellular and some consider it a major competitor to 3G WLAN access points Fixed seed nodes User terminals Infrastructure mesh: Relaying between access points only These links are static or slowly changing Mobile mesh: Relaying between all devices with fast dynamic routing 27

28 WMN Architecture Integrating IEEE and Technologies 28

29 IEEE Based Mesh Network Wired Network G 1 R G 2 R i G i A i mesh routers mesh gateways mesh aggregation devices 2 R 1 R 3 A 1 A 2 A 3 29

30 Mesh Routers Zigbee Mesh BWN Lab 30

31 MESH CLIENTS 31

32 End 32