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Tuesday, 30 May 2017

Mobile Networks




Mobile Networks




1G, फर्स्ट एनालॉग सेलुलर सिस्टम है जो की सन 1980 के शुआती दोर में आया था 1G नेटवर्क सिर्फ केबल वौइस् सर्विस के लिए था almost no consideration of data services (with the possible exception of built-in modems in some headsets)

  • 2G  (GSM,CDMA) , पहेले 1992 में आया था 2G नेटवर्क, सेलुलर टेलीफोन टेक्नोलॉजी का सेकंड जनरेशन था तथा पहला डिजिटल एन्क्रिप्शन का कन्वर्सेशन यूज़ करना वाला नेटवर्क बना , 2G नेटवर्क पहला नेटवर्क था जिसने पहली बार डाटा सर्विस और SMS टेक्स्ट messaging जैसी ऑफर लाये , but their data transfer rates are lower than those of their successors.

    2.5G networks (GPRS, CDMA2000 1x) 2G मॉडिफाई वर्शन है ,with theoretical data rates up to about 144kbit/s. GPRS offered the first always-on data service
    3G  ( UMTS TDD / TD WCDMA ) , networks succeed 2G ones,फास्टर डाटा ऑफर करने वाले तथा पहेले नेटवर्क जिसने विडियो कालिंग इनेबल किया  .

    This makes them especially suitable for use in modern smartphones, which require constant high-speed internet connection for many of their applications

    Note-  basics of UMTS TDD, the time division duplex cellular technology sometimes called TD WCDMA, part of the UMTS 3G system.

    4G ( LTE) , मोबाइल फ़ोन कम्युनिकेशन की यह चोथी जनरेशन है  It is a successor of the 3G and provides ultra-broadband internet access for mobile devices. The high data transfer rates make 4G networks suitable for use in USB wireless modems for laptops and even home internet access


Some Type of Bands
GSM,  -  Global System for Mobile communications,
CDMA - Code Division Multiple Access          
UMTS – Universal Mobile Telecommunication (3G Network)
LTE – Long Term Evolution (4G Network)

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