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A new generation of cellular standards has emerged roughly every decade since the introduction of 1G systems in 1979. Each generation is defined by the introduction of new frequency bands, higher data rates, and transmission technologies that are not backward-compatible due to the need for significant changes in network architecture and infrastructure.
AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the third largest wireless carrier in the United States, with 117.9 million subscribers as of December 31, 2024 ...
A picocell, on the other hand, is 200 meters or less, and a femtocell is on the order of 10 meters, [1] although AT&T calls its femtocell that has a range of 40 feet (12 m), a "microcell". [2] AT&T uses "AT&T 3G MicroCell" as a trademark and not necessarily the "microcell" technology, however. [3]
Mobile phone networks plan to pull the plug on their 3G service this year, with AT&T slated to go first. The move could affect you in many ways.
2G (or 2-G) provides three primary benefits over their predecessors: phone conversations are digitally encrypted; 2G systems are significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS (Short Message Service) plain text-based messages. 2G technologies enable the various mobile phone ...
The main benefits for an end user are the following: "5 bar" coverage when there is no existing signal or poor coverage; Higher mobile data capacity, which is important if the end-user makes use of mobile data on their mobile phone (may not be relevant to a large number of subscribers who instead use WiFi where femtocell is located)
For technical details on UMTS and a list of its designated operating frequencies, bands, and their common names, see UMTS frequency bands. Networks on the global UMTS-bands 1 and 8 are suitable for global roaming in ITU Regions 1, 2 (some countries) and 3. Networks on UMTS-bands 2 and 4 allow roaming in ITU Region 2 (Americas) only.
The following table is derived from table 5.1a of the release 11 of 3GPP TS 25.306 [8] and shows maximum data rates of different device classes and by what combination of features they are achieved. The per-cell per-stream data rate is limited by the Maximum number of bits of an HS-DSCH transport block received within an HS-DSCH TTI and the ...