LTE

lte

Technology Overview
UMTS Long Term Evolution (LTE) and LTE-Advanced will ensure the competitiveness of UMTS for the next decade and beyond and provide a high-data-rate, low-latency and packet-optimized system. LTE, also known as Evolved UMTS Terrestrial Radio Access (E-UTRA) and Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), is specified in 3GPP Release 8. LTE can be operated in either frequency division duplex (FDD) or time division duplex (TDD) mode, also referred to as LTE FDD and TD-LTE. Besides peak data rates of more than 100 Mbit/s in the downlink and 50 Mbit/s in the uplink, a significant increase in spectrum efficiency and capacity as well as a significant latency reduction are implemented.

Commercialization of the LTE technology started at the end of 2009. LTE has been further enhanced in order to meet the IMT-Advanced requirements. The necessary enhancements are specified in 3GPP Release 10 and beyond and are known as LTE-Advanced. IMT-conformant systems will be candidates for future spectrum bands that are still to be identified, which is another major reason for aligning LTE-Advanced with the call for IMT-Advanced technologies. This ensures that today’s deployed LTE mobile networks provide an evolutionary path towards many years of commercial operation.

Deployment Scenario

E-UTRAN can be deployed as a standalone network, but integration with existing WCDMA/HSPA, GSM/GPRS/EDGE and CDMA2000®1xEV-DO networks will become a typical deployment scenario. Thus, mobility between the different technologies needs to be supported, and handover procedures have been specified accordingly. LTE and LTE-Advanced focus on the packet-switched domain and will benefit all applications with high data rates and low latency requirements.

Key Parameters

	LTE / LTE-Advanced
Frequency range
Frequency range	E-UTRA/FDD Bands 1) UL: 1920 MHz - 1980 MHz DL: 2110 MHz - 2170 MHz 2) UL: 1850 MHz - 1910 MHz DL: 1930 MHz - 1990 MHz 3) UL: 1710 MHz - 1785 MHz DL: 1805 MHz - 1880 MHz 4) UL: 1710 MHz - 1755 MHz DL: 2110 MHz - 2155 MHz 5) UL: 824 MHz - 849 MHz DL: 869 MHz - 894 MHz 6) UL: 830 MHz - 840 MHz DL: 875 MHz - 885 MHz 7) UL: 2500 MHz - 2570 MHz DL: 2620 MHz - 2690 MHz 8) UL: 880 MHz - 915 MHz DL: 925 MHz - 960 MHz 9) UL: 1749.9 MHz - 1784.9 MHz DL: 1844.9 MHz - 1879.9 MHz 10) UL: 1710 MHz - 1770 MHz DL: 2110 MHz - 2170 MHz 11) UL: 1427.9 MHz - 1447.9 MHz DL: 1475.9 MHz - 1495.9 MHz 12) UL: 698 MHz - 716 MHz DL: 728 MHz - 746 MHz 13) UL: 777 MHz - 787 MHz DL: 746 MHz - 756 MHz 14) UL: 788 MHz - 798 MHz DL: 758 MHz - 768 MHz 17) UL: 704 MHz - 716 MHz DL: 734 MHz - 746 MHz 18) UL: 815 MHz - 830 MHz DL: 860 MHz - 875 MHz 19) UL: 830 MHz - 845 MHz DL: 875 MHz - 890 MHz 20) UL: 832 MHz - 862 MHz DL: 791 MHz - 821 MHz 21) UL: 1447.9 MHz - 1462.9 MHz DL: 1495.9 MHz - 1510.9 MHz E-UTRA/TDD Bands 33) 1900 MHz - 1920 MHz 34) 2010 MHz - 2025 MHz 35) 1850 MHz - 1910 MHz 36) 1930 MHz - 1990 MHz 37) 1910 MHz - 1930 MHz 38) 2570 MHz - 2620 MHz 39) 1880 MHz - 1920 MHz 40) 2300 MHz - 2400 MHz
Modulation	DL: QPSK, 16QAM, 64QAM UL: QPSK, 16QAM, 64QAM (optional)
Multiple access	OFDMA (DL) SC-FDMA (UL)
Duplex (uplink/downlink)	FDD/TDD
	LTE	LTE-Advanced
Channel bandwidth	scalable to 20 MHz	scalable to 20 MHz, with band aggregation up to 100 MHz
MIMO mode	DL: 2x2, 4x2 UL: 1x2, 1x4	DL: 2x2, 4x2, 4x4, 8x4 UL: 1x2, 2x2, 2x4, 4x4, 4x8
Peak data rate requirements	DL: 150 Mbit/s (2x2 MIMO) DL: 300 Mbit/s (4x4 MIMO) UL: 50 Mbit/s (16QAM) UL: 75 Mbit/s (64QAM)	DL: 1 Gbit/s UL: 500 Mbit/s

Standardization

LTE is being specified in 3GPP (3rd Generation Partnership Project). Work on LTE started in December 2004 with a feasibility study that was finalized in 3GPP Release 7. LTE specifications for the FDD and TDD modes form part of 3GPP Release 8. 3GPP Release 9 will bring further enhancements to LTE. Furthermore, the study item on LTE-Advanced as the next evolution stage was started in 2009 to investigate how LTE can become a true 4G system. In September 2009 the 3GPP Partners made a formal submission to the ITU proposing that LTE Release 10 and beyond should be evaluated as a candidate for IMT-Advanced.

The following link provides access to 3GPP specifications: http://www.3gpp.org

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