No abstract

No abstract

No abstract

This paper proposes Mobility technology of Multi RAT (Radio Access Technology) terminal based on SDN (Software Defined Network). It improves transmission speed and reduce handoff latency by using two network interfaces. These network interfaces make dual link with APs (Access Point). Each link has the separate role, Active and Standby. Active Link is used for communication and Standby Link is used for scanning near APs.

Mobile tra±c is currently the most important tra±c on the Internet, both domestically and internationally. This is predominantly attributable to widespread cloud computing-based services on mobile networks. Fifth generation (5G) mobile networks are expected to comfortably accommodate this type of tra±c by supporting 1,000 times faster speeds than conventional 4G. However, commercial implementation of 5G mobile is targeted for the year 2020. Therefore, interim accommodation approaches are needed. In essence, 5G mobile networks are an evolution of 4G in which a licensed spectrum that generates revenue from user data transfer is being considered. Consequently, more cost-e®ective methods that utilize the unlicensed spectrum are also desired. Meanwhile, concomitant with pursuit of miniaturization and reduction in weight, the number and types of network interfaces in recent mobile devices are increasing. We propose a method for carrier aggregation of multiple heterogeneous wireless links based on software-de¯ned networking (SDN) that controls tra±c and manages the wireless interfaces of mobile devices e®ectively when multiple radio access technologies are available. Evaluations conducted of the proposed method on an experimental testbed developed using the OpenStack cloud computing platform with aggregated multiple radio access technology environments indicate that it is feasible and provides higher data rate.