A TUTORIAL ON LTE EVOLVED UTRAN (EUTRAN) AND

LTE SELF ORGANIZING NETWORKS. The main features of LTE are high peak data rate, flexibility of spectrum usage, low latency

times, higher capacity per cell, etc. The radio interface of LTE is based on Orthogonal

Frequency Division Multiple Access (OFDMA) in the downlink and Single Carrier-Frequency

Division Multiple Access (SC-FDMA) in the uplink. LTE undergoes a major design change in its

Core Network Architecture. The previously used separate cores for Voice and Data in 3G are

being replaced by a single packet based or an all-IP core in LTE. This evolution of the Core

Network is commonly referred to as System Architecture Evolution (SAE).