Friday, 20 December 2013

Wi-Fi: Wireless Fidelity





Wi-Fi, or LAN, could be a wireless native space network (WLAN) technology supported the Institute of Electrical and physics Engineers’ (IEEE) 802.11 family of standards, which has 802.11a, b, g and n. There area unit many key variations between cellular and Wi-Fi. as an example, Wi-Fi signals have a spread of concerning two hundred to three hundred feet, whereas cellular GSM signals will travel for many miles. Wi-Fi conjointly uses unauthorized spectrum, therefore not like GSM, it's no inherent protection from interference.

Wi-Fi is employed for a spread of applications. one in all the foremost common is home and business Wireless native space Networks (WLANs). the opposite is “hotspots,” wherever users with AN 802.11 laptop card electronic equipment, hybrid cellular/Wi-Fi telephone set or portable computer with AN embedded electronic equipment get net access for complimentary or for a fee. Hotspots area unit usually found publicly areas like airports and caf├ęs.

Wireless operators oftentimes mix Wi-Fi with their 2G and/or 3G networks as the simplest way to grant their customers a lot of choices for accessing the web and information services. By providing adjunct Wi-Fi services, operators will leverage the put in base of Wi-Fi laptop card modems and laptops with embedded 802.11 modems.

Wi-Fi conjointly has become a very important technology for the preparation of unauthorized Mobile Access (UMA) services. These usually involve a telephone set that has a cellular and Wi-Fi radio that may profit of a field or in-home Wi-Fi router to position calls mistreatment VoIP technology that may then transfer seamlessly to a cellular network once outside the vary of the Wi-Fi signal. not like VoIP vocation, once UMA customers leave home or exit a Wi-Fi hotspot, their calls area unit seamlessly transferred to it operator’s GSM-HSPA wireless network. Calls conjointly transfer from the wireless network onto Wi-Fi.

IP multimedia system system (IMS) is another system that's complementary to UMA and combines the weather of the cellular and Wi-Fi networks. whereas UMA is AN access answer gives|that gives|that has} roaming between cellular and Wi-Fi networks and helps provide property within buildings, IMS and also the core network give the full service design. IMS is AN trade standards-based platform for brand new services that's access technology agnostic. While UMA could be a solution for the acute in-building coverage challenge, it's not an entire service platform and may not be compared with IMS per se.

IMS services may be delivered over any access technology, together with phone line, cable, cellular and wireless technologies together with Wi-Fi and WiMAX. Since IMS is access-agnostic, it will support UMA yet as alternative access ways, such as native informatics access over Wi-Fi.

Wi-Fi is conjointly used to deliver net Protocol tv (IPTV) into the home. Leading operators together with TeliaSonera and Telenor (Sweden), and Belgacom SA (Belgium) provide gear to deliver HD IPTV streams over commonplace Wi-Fi throughout the house network, et al. like AT&T have according trials. employing a device for 802.11n wireless connections instead of coaxal cable as the home’s main video distribution medium, transmissions of 30 Mbps to 50 Mbps are touted as guaranteed throughput for streaming video throughout a typical 2,500 to 3,000 sq. foot home. Some devices could support up to six high-definition television IPTV streams running at ten Mbps every.

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