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e-UTRA is the air interface of 3GPP's Long Term Evolution (LTE) upgrade path for mobile networks. It is an acronym for evolved UMTS Terrestrial Radio Access, also referred to as the 3GPP work item on the Long Term Evolution (LTE)〔(3GPP UMTS Long Term Evolution page )〕 also known as the Evolved Universal Terrestrial Radio Access (E-UTRA) in early drafts of the 3GPP LTE specification.〔 E-UTRAN is the initialism of Evolved UMTS Terrestrial Radio Access Network and is the combination of E-UTRA, UEs and EnodeBs. It is a radio access network standard meant to be a replacement of the UMTS and HSDPA/HSUPA technologies specified in 3GPP releases 5 and beyond. Unlike HSPA, LTE's E-UTRA is an entirely new air interface system, unrelated to and incompatible with W-CDMA. It provides higher data rates, lower latency and is optimized for packet data. It uses OFDMA radio-access for the downlink and SC-FDMA on the uplink. Trials started in 2008. == Features == EUTRAN has the following features: * Peak download rates of 299.6 Mbit/s for 4×4 antennas, and 150.8 Mbit/s for 2×2 antennas with 20 MHz of spectrum. LTE Advanced supports 8×8 antenna configurations with peak download rates of 2,998.6 Mbit/s in an aggregated 100 MHz channel.〔(3GPP TS 36.306 E-UTRA User Equipment radio access capabilities )〕 * Peak upload rates of 75.4 Mbit/s for a 20 MHz channel in the LTE standard, with up to 1,497.8 Mbit/s in an LTE Advanced 100 MHz carrier.〔 * Low data transfer latencies (sub-5 ms latency for small IP packets in optimal conditions), lower latencies for handover and connection setup time. * Support for terminals moving at up to 350 km/h or 500 km/h depending on the frequency band. * Support for both FDD and TDD duplexes as well as half-duplex FDD with the same radio access technology * Support for all frequency bands currently used by IMT systems by ITU-R. * Flexible bandwidth: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz are standardized. By comparison, W-CDMA uses fixed size 5 MHz chunks of spectrum. * Increased spectral efficiency at 2–5 times more than in 3GPP (HSPA) release 6 * Support of cell sizes from tens of meters of radius (femto and picocells) up to over 100 km radius macrocells * Simplified architecture: The network side of EUTRAN is composed only by the enodeBs * Support for inter-operation with other systems (e.g., GSM/EDGE, UMTS, CDMA2000, WiMAX, etc.) * Packet switched radio interface. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「E-UTRA」の詳細全文を読む スポンサード リンク
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