12- Client-Server

12- Client-Server - Mobile client-server communications CSE...

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Click to edit Master subtitle style 5/7/11 Mobile client-server communications CSE 390 Fall 2010
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5/7/11 Cellular connection types Time Division Multiple Access (TDMA) – assigns calls a time slot on a given frequency. Used by GSM. Code Division Multiple Access (CDMA) – assigns each call a unique code. Used by UMTS. Global System for Mobile Communication (GSM) – most popular standard. 80% of the global market, 1.5 billion users, 212 countries. Extensive roaming arrangements with international mobile operators. Second Generation (2G) technology – meaning both signaling and speech channels are digital. GSM introduced Short Message Service (SMS). Different frequencies are used in many countries (USA and Canada use 850MHz and 1900MHz). The iPhone has a tri- band frequency chipset to accommodate the most common
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5/7/11 Cellular connection types (cont.) Enhanced Data Rates for GSM Evolution (EDGE) – a “bolt-on” enhancement for GSM networks to provide higher bit rates. Does not require installation of new transmitter towers. Universal Mobile Telecommunications System (UMTS) – Third Generation (3G) technology based on many of the GSM protocols (and was originally called 3GSM), but uses CDMA as the underlying air interface. Uses same core network standard as GSM – Mobile Application Port (MAP). Uses Universal Subscriber Identity Module (USIM) –
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5/7/11 Wireless connection types IEEE 802.11a/b/g – Wireless Local Area Network (WLAN) technology. More generally called WiFi. Network access points are called hotspots. Typically operates in the range of 2.4 GHz, with a range of about 120 feet indoors and 300 feet outdoors. Signal can be affected by radio reflection off buildings and trees. Interference can also be caused by
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12- Client-Server - Mobile client-server communications CSE...

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