TD-LTE系统仿真.pdf

发布时间：2022-06-13 发布人：admin 分类：说明书资料大小：16.50M 资料格式：pdf 举报版权申诉

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3GPP LTE Fundamentals

LTE Overview LTE Major Features LTE Air Interface

LTE Overview What is LTE LTE LTE Overview Overview LTE Major Features Why want LTE Standard Evolution Network Architecture LTE Air Interface Marketing Status

What is LTE? What is LTE? - LTE is a 3GPP project name for the evolution of UMTS - It is now linked with the development of a new air interface - Existed together the evolution of UMTS via HSDPA and HSUPA Formal names of LTE: - Evolved UTRA (E-UTRA) / Evolved UTRAN (E-UTRAN) - Evolved UMTS Terrestrial Radio Access - Evolved UMTS Terrestrial Radio Access Network Related names: - 3.9G,Super 3G, Beyond 3G, HSOPA(Evolution of HSDPA/HSUPA with OFDM) - These terms are not standard, and may fade out soon. LTE Core Network name: It is called SAE (System Architecture Evolution). It refers to the evolved core network.

Why want LTE? Design requirements ( TR 25.913 ): • Data Rate: 100 Mbps ( DL ) and 50 Mbps ( UL ) for 20 MHz • Throughput: 3-4 times better than release 6 (DL ) 2-3 times better than release 6 (UL ) • Spectrum Efficiency: 3-4 times better than release 6 (DL ) 2-3 times better than release 6 (UL )

Why want LTE? Design requirements ( TR 25.913 ): • Latency RTT less than 10ms • Spectrum allocation: operation in paired ( FDD ) and unpaired ( TDD ) spectrum • Bandwidth: scalable bandwidths of 5 MHz, 10 MHz, 15 MHz and 20 MHz bandwidths smaller than 5 MHz supported for more flexibility • Multimedia Broadcast Multicast Services ( MBMS ): further enhanced and referred to as E-MBMS

Wireless evolution: Five competing 3.9G systems 2G IS-95A cdma GSM IS-136 TDMA PDC 802.11b 2.5 G IS-95B IS-95B cdma cdma HSCSD GPRS 3G IS-95C cdma2000 E-GPRS EDGE W-CDMA FDD W-CDMA TDD iMode TD- SCDMA LCR-TDD 3.5 G 1xEV-DO Release 0 1xEV-DO Release A 1xEV-DO Release B HSDPA FDD & TDD HSUPA FDD & TDD 3.9G UMB cf 802.20 LTE E-UTRA EDGE Evolutio n HSPA+ 802.16e Mobile WiMAXTM 802.11a 802.11g 802.11h 802.11n 802.16d Fixed WiMAXTM WiBRO

Standard evolution ( RAN & GERAN ) Commercial introduction Main feature of Release Basic 3.84 Mcps W-CDMA (FDD & TDD) 1.28 Mcps TDD (aka TD-SCDMA) HSDPA HSUPA HSPA+ (64QAM DL, MIMO 16QAM UL). Many smaller features plus LTE & SAE Study items LTE Work item – OFDMA air interface SAE Work item New IP core network More HSPA+ 1999 3GPP Release Rel-99 Rel-4 Rel-5 Rel-6 Rel-7 2003 Trials 2006 2007 2008+ Rel-8 2009 -2010? 2010

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