The Advantages of Using Ethernet Networks Over Traditional Wi-Fi
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1 Corso di Laboratorio di Telematica A.A '05 Francesco Chiti Evoluzione delle reti di telecomunicazioni: linee guida, scenari e dispositivi 1
2 Convergenza delle reti wireless WLAN 1-2 Mbps IEEE WLAN Mbps WPAN 1 Mbps IEEE a/b/f/g Bluetooth WLAN Gbps WPAN Gbps IEEE e/h UWB Mobile WLAN Home networking Wereable WPAN IEEE (WiMax) IEEE G 2G 3G 4G Analog voice Analog AMPS TACS Digital voice IS 38 (TDMA) Medium speed pkt data Multimedia Messaging EDGE IS 54 (Analog AMPS) GSM Text messaging UMTS R5 IS 95 Low speed pkt data cdma2000/1xev-do GPRS UMTS R99 cdma2000 High speed pkt data Broadband Multimedia Video coded UMTS/HSDPA cdma2000/1xev-dv 2
3 Top ten IT trends i. Data growth faster than Moore law ii. e-cooperation iii. Universal commercial device (service box) iv. Self adaptivity v. On-line business & just-in-time decision making vi. Computer will be the nw vii. IT cybernation will reduce costs viii.it scalable security ix. Open source sw x. Biometric ID 3
4 Home networking IEEE802.11x Modem DVB-RCS Modem DVB-T / IEEE Bluetooth IEEE
5 the universal device i. Data: generation/processing storage presentation ii. More practical interaction paradigms: faster secure mobile iii. Building of a virtual environment: Ambient control Pervasive communications 5
6 the universal network Embeddedness Ubiquity Nomadicity INTERNET: a pervasive, global, nervous system 6
7 the universal network Nomadicity Fast Broadband access Efficient transport Intelligence in the edge Wireless (mobility) Embeddedness Cyberspace Physical space Alive environment Ubiquity Universal roaming Cellular nws WiFi nws 7
8 Transport Network (TCP/IP) Access Network (satellite/cellular/wman/wlan/wpan) Transport Network Data Link Physical Data Link Physical 8
9 Ad Hoc Network Transport Network Data Link Cross Layer protocols design Optimization of adjacent layers aware protocols Cross layer adaptability Across layers information passing and functionalities adaptation to channel and load variations Physical 9
10 Nomenclatura Reti TLC a pacchetto Wide Area Network Rete Geografica Metropolitan Area Network Rete Metropolitana Local Area Network Rete Locale Home Area Network Rete Domestica Personal Area Network Rete personale 10
11 IEEE /2 Wireless PAN Bluetooth (periferiche, PDA) IEEE High rate/low power WLAN (multimedia, home networking): UWB (IEEE a) IEEE Low rate/low power WPAN (periferiche, sensori) Nomadic Computing Ubiquitous Computing: The most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it. 11
12 LAN Ethernet: inizio '70: Digital, Intel, Xerox DIX, 1982: Ethernet a 10 Mbit/s: accesso condiviso CSMA/CD IEEE 802.3: 1985 redatto standard simile a Ethernet (LLC, fisico) Token Ring: nata nel 1976 in IBM, topologia a stella, velocità 4 Mbit/s 1982: IEEE e velocità a 16 Mbit/s: accesso a token. Fast Ethernet: Ethernet a 100 Mbit/s Gigabit Ethernet: Ethernet a 1 Gbit/s LAN MAN: Gigabit Ethernet usata per collegare aree metropolitane a livello 2. 12
13 LAN WLAN Standard IEEE802.11: 1990 traffico dati Ethernet-like su canale radio IEEE802.11b: Mbps (WiFi) IEEE802.11a/g: Mbps (WiFi) IEEE802.11e: 2004 real-time (voce+video+dati) IEEE802.11i: 2004 sicurezza WiFi IEEE802.11r: 2004 WiFi mobili Motivazioni Minori complessità e costi di installazione dei sistemi cellulari Internetworking (pervasive computing) Integrazione con terminali evoluti 13
14 Paradigmi di mercato Hot Spot: area limitata in cui c'è copertura wireless e fornitura di servizi informativi o di comunicazione Wi-Fi Zone: area più vasta, certificata Wi-Fi, coperta da rete Wi-Fi per servizi wireless con interconnesisone di Hot Spot Wi-Fi Area: area anche metropolitana in cui c'è connettività wireless mediante reti Wi-Fi 14
15 Paradigmi di mercato Operatori TLC Radiomobili Cellulari Servizi Voce / telefonia Provider Wireless Hot Spot (? ) Voice over IP Voice over WLAN SMS, MMS, Mobile Internet, Hot Spot Internet Service Providers Servizi Internet / dati 15
16 Convergenza a breve termine Public area hot spot in centri commerciali, località turistiche, aereoporti, etc. Home Networking: interconnessione dispositivi domestici con tecnologie wireless (domotica) Integrazione accesso ADSL con WLAN Location-based services (anche via EDGE/UMTS) Integrazione card WiFi/GSM/GPRS/UMTS per risolvere autenticazione e billing 16
17 Convergenza a lungo termine Public integrated wireless networks: Wireless routers (taxi, bus, car,etc.) All IP (UMTS R5) Mobile IP Advanced User Equipment Integration within UMTS/WLAN/Bluetooth Content e Context-awareness Service Discovery User Intelligent Software Agents Distributed virtual high processing capability Seamless ubiquitous computing 17
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