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LTE FDD / LTE TDD

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3GPP Long Term Evolution (LTE) moves beyond current 3G wireless communications capabilities to provide increased peak data rates, improved spectral efficiency, and reduced user plane and control plane latency. To accomplish these goals, LTE uses Orthogonal Frequency Division Multiple Access (OFDMA) for the downlink and Single Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink. OFDMA was chosen for its high data rate capacity and its high spectral efficiency. SC-FDMA was chosen for its lower peak to average power ratio (PAPR) to maximize battery life in mobile devices. LTE achieves a peak downlink data rate of 100 Mbps and a peak uplink data rate of 50 Mbps with a 20 MHz bandwidth.

LTE enhances Universal Terrestrial Radio Access (UTRA) performance while maintaining compatibility with earlier UTRA systems and other wireless technologies such as WiMax™ and WLAN.

Other key features of LTE include the following:
A. Carrier aggregation that supports up to 5 component carriers (e.g. 1 primary and 4 secondary). (Basic LTE-A)
B. Simultaneous PUCCH and PUSCH (Advanced LTE)
C. Scalable bandwidth: 1.4 MHz, 3.0 MHz, 5.0 MHz, 10 MHz, 15 MHz, and 20 MHz.
D. Downlink modulation types: QPSK, 16-QAM, and 64-QAM
E. Uplink modulation types: QPSK, 16-QAM, and 64-QAM
F. FDD and TDD operating modes
G. IP-based, packet-switched architecture
H. MIMO capability, up to 8 X 8 MIMO

LTE employs a new network architecture made up of multiple Evolved Packet Cores (EPCs) that communicate with each other and with evolved universal terrestrial radio access network base stations (eNBs). Each EPC contains a Mobile Management Entity (MME) and a System Architecture Evolution Gateway (SAE). The eNB stations communicate with the EPCs, with each other, and with user equipment (UE).

Line cards of LTE solution is Quectel Wireless Solutions.