通信工程外文翻译--移动通信3g技术分析(编辑修改稿)

通信工程外文翻译--移动通信3g技术分析(编辑修改稿)内容摘要：

in Toronto in 2020 3GPP. LTE is not 4G technologies generally misunderstood, but 3G and 4G technology as a transition between the global standards, to improve and enhance the 3G air access technology uses OFDM and MIMO as its wireless work evolution The sole criterion. Able to provide downlink 326Mbit / s and uplink peak data rate of 86Mbit / s in 20MHz spectrum bandwidth. Improve the cell edge user performance, increase cell capacity and reducing system latency. Study of LTE, generally considered a very important part, such as the reduction of the waiting time, higher user data rates, system capacity and coverage improvement lower operating costs. In order to achieve these goals, the evolution of the wireless interface and wireless work architecture is equally important. Considering the need to provide a ratio the 3G a higher data rate, and the spectrum may be allocated in the future, LTE needs to support the transmission bandwidth of the higher than 5MHz. UTRA and UTRAN evolution goal is to establish a high transfer rate, lowlatency, based on the evolution of wireless access packetoptimized architecture. 3GPP LTE radio interface and radio access work architecture being developed evolution of technology include the following: (1) significant increase in the peak data rate. Achieve 100Mbit / s downlink transmission rate (5bit/s/Hz) 20MHz bandwidth 50Mbit / s uplink transmission rate (). (2) In the case of maintaining the current base station position unchanged to increase the bit rate of the cell boundary. Such as the MBMS (Multimedia Broadcast and Multicast Services) in the cell boundary can be provided data rate of 1bit/s/Hz. (3) significantly improve spectrum efficiency. Such as 2 to 4 times the R6 spectrum efficiency. (4) The radio access work (UE to the ENode B user plane) the delay time is less than 10ms. (5) control surfaces significantly reduce waiting time, less than 100ms. (6) bandwidth class: a) 5,10,20 MHz and 15MHz。 b) may be taken of , and a , in order to adapt to the narrowband spectrum allocation. (7) support existing 3G systems and non3GPP specification system interoperability. (8) support further enhanced MBMS. The above evolution objective relates to the system capacity and performance of the system, is the most important part of the LTE study, the EUTRA and EUTRAN maintain strongest petitiveness of the fundamental. Compared with other wireless access, high spectral efficiency, wide area coverage and support for highspeed mobile is the main feature of the EUTRAN system. In EUTRAN, when a moving rate of from 15 to 120km / h, the highest data transfer performance can be obtained. The support of the EUTRAN 120 ~ 350km / h between the cellular and even up to a rate of movement of 500km / h. Throughout the rate range, R6 in the CS domain, speech and other realtime services, in the EUTRAN through the PS domain to support, and requires at least the same performance and the UTRAN. LTE layer 1 program in the solicitation of six options being evaluated in 3GPP RAN1 Working Group. They are: (1) FDD, the uplink uses a single carrier FDMA (SCFDMA), an OFDMA downlink adopted. (2) FDD, uplink and downlink are used OFDMA. (3) FDD, uplink and downlink are used in multicarrier WCDMA (MCWCDMA). (4) TDD,。