Mobility management is one major challenge for wireless network design. Advanced wireless technologies provide mobile nodes with multi-mode radio interfaces, so subscribers can benefit from disparate mobile communication systems. Meanwhile, researchers are putting efforts into standardization of IPv6-based mobility protocols. Hence, wireless networks can offer more flexible mobility support than ever before. However, as the demands for high-speed Internet access and multimedia services increase, guaranteeing host mobility with quality of service provisioning becomes more difficult. Both network connectivity and session continuity need to be carefully handled during handover. This paper proposes a new mobility protocol, called seamless mobile IPv6 (SMIPv6). Its novelty consists of pre-configuring bidirectional secure tunnels among access routers before handoff, as well as using such tunnels to guarantee handoff seamlessness. To evaluate the performance, simulations are conducted using OPNET Modeler v.12.0, of which results demonstrate that SMIPv6 delivers better performance than MIPv6 in terms of handoff latency and packet losses.

This paper introduces a method for incorporating software engineering concepts into the computer science curriculum earlier by using a structured project in CS1. The project is designed such that it must be completed using phases of a software development cycle. This approach provides the students earlier exposure to software engineering and grounds software engineering practice throughout the curriculum. With a better understanding of and appreciation for the software development process, students are better prepared to handle future academic and professional projects. This paper presents a detailed discussion of the CS1 project and its execution, accompanied by results and feedback from a post-project survey administered to students.

Abstract--In next-generation wireless networks, mobile nodes (MNs) need to freely change their network attachment point while communicating with others. Accordingly, it is crucial for mobile operators to provide efficient seamless mobility support. Several mobility protocols have been standardized by the working groups of the Internet Engineering Task Force (IETF). However, none of them can provide seamless mobility support for users in the next-generation wireless network. This paper proposes a new seamless mobility support protocol, and presents performance comparison with existing mobility protocols, such as MIPv6 and its enhancements.