xpected to transfer 23 times more traffic than the current RANs and to cover more BSs, and SO the approach link requires a greater traffic capacity and better economical performance. In order to increase the capacity, the radio link bandwidth must be broadened. Therefore, the radio frequency used for the links will become higher in order to support the wider bandwidth, making the applicable transmission distance of a radio link shorter. In order to compensate for this problem, increasing the output power and using a high directivity antenna are applicable techniques, but this is a costly option. In order to solve these problems multihop wireless connections are used, taking advantage of the cluster-type RAN structure. In multihop connections the signal transmission distance is shorter than in a single-hop connection, but the necessary transmission capacity is larger because of the relay traf- fic. The multihop wireless connection is superior to the single-hop connections from the viewpoint of the total output power, although it carries relay traffic. In addition, due to the multihop configura- tion it is also not necessary to find a line-of-sight radio path, which directly connects a BS with the cluster-head BS. Network Modelling 4G architecture uses technologies such as the Ethernet (802.3) for wired access, Wi-Fi (802.11b) for wireless LAN access and WCDMA (the physical layer of UMTS) for cellular access, and is IPv6 based. In such an environment seamless intertechnology handovers need to be supported. Thus mobility cannot be simply handled at the physical layer, and requires implementation at the network layer. Here, the same IPs handle the movement between different cells. It is required that the users/terminals handover between any of these technologies without breaking their network connection and maintaining their contracted QoS levels. Also, the QoS and AAAC (au- thentication, authorisation, accounting and changing) subsystems are responsible of serving each user according to the SLA (service level agreem