1. Mobile Communication and Mobile Computing1 Mobile Communication

2. Mobile Communication and Mobile Computing2 GSM (Global System for Mobile Communications): worldwide standard for digital, cellular Mobile Radio Networks UMTS (Universal Mobile Telecommunications System): European Standard for future digital Mobile Radio Networks LTE (Long Term Evolution) AMPS (Advanced Mobile Phone System): analog Mobile Radio Networks in USA DECT (Digital Enhanced Cordless Telecommunications): European standard for cordless phones TETRA (Terrestrial Trunked Radio): European standard for circuit switched radio networks ERMES (European Radio Message System): European standard for radio paging systems (Pager) 802.11: International standard for Wireless Local Networks Bluetooth: wireless networking in close/local area Inmarsat: geostationary satellite systems Teledesic: planned satellite system on a non-geostationary orbit Mobile Communication Networks: Examples

3. Mobile Communication and Mobile Computing3 Used Acronyms CT2: Cordless Telephone 2. Generation HSCSD: High Speed Circuit Switched Data GPRS: General Packet Radio Service EDGE: Enhanced Data Rates for GSM Evolution IMT2000: International Mobile Telecommunications by the year 2000 MBS: Mobile Broadband System

4. Mobile Communication and Mobile Computing4 GSM: Global System for Mobile Communications

5. Mobile Communication and Mobile Computing5 GSM: Properties Cellular radio network (2nd Generation) Digital transmission, data communication up to 9600 Bit/s Roaming (mobility between different net operators, international) Good transmission quality (error detection and - correction) Scalable (large number of participants possible) Security mechanisms (authentication, authorization, encryption) Good resource use (frequency and time division multiplexing) Integration within ISDN and fixed network Standard (ETSI, European Telecommunications Standards Institute)`

6. Mobile Communication and Mobile Computing6 UMTS - Facts Consideration: early 90ies Universal Mobile Telecommunications System, developed in the EU (ETSI: European Telecommunication Standards Institute) UMTS is the European implementation of IMT-2000 (International Mobile Telecommunications by the year 2000) Start of network expansion: –in Europe: 2003 (some trials, e.g. British Telecom on Isle of Man, 2002) –in the USA: 2005 –in Japan since 2000 : NTT DOCOMO

7. Mobile Communication and Mobile Computing7 system general, worldwide roaming high data rates: 144 kbit/s mobile, up to 2 Mbit/s at local area fusion of different mobile radio communications-, wireless- and pager-systems into one common system speech-, data-, and multimedia- information services independent of used network access support of different carrier services: –real-time capable/not real-time capable –circuit switched/ packet switched Roaming also between UMTS and GSM and satellite networks Asymmetrical data rates in up-/downlink Characteristics

8. Mobile Communication and Mobile Computing8 Bluetooth - Facts Harald Bluetooth was the King of Denmark in the 10th century 1998 started from Ericsson, Intel, IBM, Nokia, Toshiba Open Standard: IEEE 802.15.1 Generally for wireless Ad-hoc- piconets (Range < 10m) Goal: not expensive One-Chip-Decision for radio/ wireless communication networks Use fields: –Connection of peripheral devices –Support of Ad-Hoc-Nets –Connection of different networks Frequency band in IMS-Range of 2,4 GHz

9. Mobile Communication and Mobile Computing9 Bluetooth Pico nets with up to 8 participants (ad-hoc) (one master, slaves) Scatter nets as an association of different pico nets frequency hopping is used for improving of interception safety and system robustness

10. Mobile Communication and Mobile Computing10 Bluetooth - properties Range: - 10 cm up to 10 m at 1 mW transmitting power - up to 100m at 100mW Data rates: –433,9 kBit/s asynchronous-symmetrical –723,2 kBit/s / 57,6 kbit/s asynchronous-asymmetrical –64 kBit/s synchronous, voice service –In future up to 20 Mbit/s (IEEE 802.15.3)

11. Mobile Communication and Mobile Computing11 Bluetooth-comparison Source: http://www.okisemi.com FUNCTIONBluetooth v1.1IrDA Data 1.1IEEE802.11 (WLAN) Range w/o PA:10 meter max.1 meter max.50 meter max. Angle:omni-directionalca 30°omni-directional RF Frequency Band: ISM Band, 2.4 GHzInfrared RadiationISM Band, 2.4 GHz Mobility:mobilestationarymobile Data rate:721kBit/s4MBit/s2MBit/s Security level:HighLowHigh