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In telecommunications, long-term evolution (LTE) is a standard for wireless broadband communication for cellular mobile devices and data terminals. It is considered to be a "transitional" 4G technology, [1] and is therefore also referred to as 3.95G as a step above 3G.
Downlink LTE: LTE Category 19 (1600 Mbit/s). 7x20 MHz carrier aggregation. Up to 256-QAM. Up to 4x4 MIMO; Uplink LTE: LTE Category 13 (225 Mbit/s). 3x20 MHz carrier aggregation. Up to 64-QAM; Support of more than 45 (4G/LTE) bands simultaneously; Featured in: iPhone 11, [10] 11 Pro/11 Pro Max, [11] iPhone SE 2 [12] Intel 14nm+ FinFET process ...
Networks on LTE bands 1, 3 (LTE-FDD) are suitable for roaming in ITU Regions 1, 3 and partially Region 2 (e.g. Costa Rica, Venezuela, Brazil and some Caribbean countries or territories. Networks on LTE band 20 (LTE-FDD) are suitable for roaming in ITU Region 1 only. Networks on LTE band 5 (LTE-FDD) are suitable for roaming in ITU Regions 2 and 3.
Another factor reducing throughput is deliberate policy decisions made by Internet service providers that are made for contractual, risk management, aggregation saturation, or marketing reasons. Examples are rate limiting , bandwidth throttling , and the assignment of IP addresses to groups.
The speed of light imposes a minimum propagation time on all electromagnetic signals. It is not possible to reduce the latency below = / where s is the distance and c m is the speed of light in the medium (roughly 200,000 km/s for most fiber or electrical media, depending on their velocity factor).
4G eLTE is Huawei's proprietary derivative of the LTE standard, the "e" standing for "enhanced", intended to provide wireless broadband transmission with peak downlink speeds of 50 Mbit/s and 20 Mbit/s uplink per site in 5 MHz, 10 MHz and 15 MHz frequencies.
LTE-U is intended to let cell networks boost data speeds over short distances, without requiring the user to use a separate Wi-Fi network as they normally would. It differs from Wi-Fi calling ; there remains a control channel using LTE, but all data (not just phone calls) flows over the unlicensed 5 GHz band, instead of the carrier's frequencies.
Specific requirements of the IMT-Advanced report included: Based on an all-IP packet switched network. [4]Interoperability with existing wireless standards. [5]A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while the client and station are in relatively fixed positions.
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