LTE stands for Long Term Evolution, marketed as 4G LTE, is a standard for wireless communication of high-speed data for mobile phones and data terminals. It is based on the GSM/EDGE and UMTS/HSPA network technologies, increasing the capacity and speed using a different radio interface together with core network improvements. The standard is developed by the 3GPP (3rd Generation Partnership Project) and is specified in its Release 8 document series, with minor enhancements described in Release 9 and subsequent releases.

Till date, there are two separate technology families for providing wide-area wireless communications: commercial cellular networks and dedicated communication networks for critical users.

To provide the best service to both communities there is now industry support for greater use of common technology. Work is on-going in Release 12 of 3GPP LTE standards to enhance LTE to meet requirements of mission critical users.

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