Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) substantially improves end-user throughputs, sector capacity, and reduces user-plane and control-plane latencies, bringing significantly improved user experience with full mobility. With the emergence of Internet Protocol as the protocol of choice for carrying all types of traffic, the 3GPP LTE is expected to provide support for IP-based traffic with end-to-end Quality of Service (QoS). Voice traffic will be supported mainly as voice over IP, enabling integration with other multimedia services. Initial deployments of 3GPP LTE are expected in late 2010 and commercial availability on a larger scale will likely happen a few years later. Unlike its predecessors, which were developed within the framework of Release 99 UMTS architecture, 3GPP has specified the Evolved Packet Core (EPC) architecture to support the E-UTRAN through reduction in the number of network elements and simplification of functionality, but most importantly allowing for connections and handover to other fixed and wireless access technologies, providing the network operators the ability to deliver a seamless mobility experience [37]. 3GPP has set aggressive performance requirements for LTE that rely on improved physical layer technologies such as Orthogonal Frequency Division Multiplexing (OFDM) and Single-User and/or Multi-User Multiple-Input Multiple-Output (MIMO) techniques, and streamlined data link layer protocols and functionalities. The main objectives of LTE are to minimize the system and user equipment (UE) complexities, to allow flexible spectrum deployment in the existing or new frequency bands, and to enable coexistence with other 3GPP radio access technologies. The 3GPP long-term evolution symbolizes the migration of the Universal Mobile Telecommuni- cation System (UMTS) family of standards from systems that supported both circuit-switched and packet-switched voice/data communications to an all-IP, packet-only system. The development of the LTE air interface is closely coupled wit