-mobile convergence will produce tremendous traffic in the future mobile networks. To make this happen, goals for the future evolved system include support for improved system capacity and coverage, high peak data rates, low latency, reduced network costs, multi-antenna support, flexible bandwidth operations and seamless integration with existing systems. As a significant step for achieving such a system beyond 3G mobile communication systems, 3GPP is specifying a new radio access technology, known as Long Term Evolution (LTE) to ensure the competitiveness of the 3GPP technology family for the long term. LTE air interface and its radio access as called Evolved UMTS Terrestrial Radio Access Network 2.3 Evolution of UMTS (E-UTRAN) are specified in the new evolved 3GPP Release 8 of the UMTS standards. To support the LTE radio interfaces and the E-UTRAN, 3GPP is also specifying a new Packet Core, the Enhanced Packet Core (EPC) network architecture. The work specifying the core network is commonly known as System Architecture Evolution (SAE). LTE employs a completely new air interface technology which is different to the existing 3G technologies. It uses Orthogonal Frequency Division Multiplex (OFDM) technologies for the downlink and Single-Carrier FDMA (SC-FDMA) for the uplink. It employs Multiple-Input / Multiple-Output (MIMO) with up to four antennas per station which significantly increases throughput rates. With the new air interface technologies, LTE can achieve up to 100Mbps on the downlink and up to 50Mbps on the uplink. The spectral efficiency and the average user throughput in the LTE downlink will be 3 to 4 times of that of HSDPA while in the uplink, it will be 2 to 3 times that of HSUPA. More details on the LTE air interface technology can be found in [Mot07]. E-UTRAN is expected to substantially improve end-user throughputs and reduce user plane latency, bringing significantly improved user experience with full mobility. This can be achieved by introducing new, fully IP-based networks which will have a fl