Long-term evolution network architecture

This paper provides a technological overview of the system architecture evolution (SAE) of LTE networks. The target of this overview is to provide a basic knowledge on 4G cellular network structure, entities responsibilities and protocol-stack. The overview is mainly based on the relevant 3GPP standards and on Chapter 3 of the book "LTE for UMTS: OFDMA and SC-FDMA based radio access" edited by Harri Holma and Antti Toskala.