Koshiro Mitsuya

Network mobility from the InternetCAR perspective

A number of devices, including sensors, mobile telephones, and various computers will be deployed in next generation vehicles, and interconnected on a local network. These vehicles will be connected to the Internet as both a step toward ubiquitous computing and as a means to meet intelligent transportation systems (ITS) needs. For doing so, the communication system requirements are investigated in the InternetCAR project, particularly IPv6 and network mobility support which is mandated to maintain ongoing sessions as the in-vehicle embedded network changes its point of attachment to the Internet topology. In order to deal with the specific issues raised by network mobility, which contrast with traditional work on host mobility, the IETF NEMO working group has been set up. The initial proposition for doing so, prefix scope binding updates, is implemented in our testbed, designed to demonstrate the proposed communication system.

Dynamic management of multiple mobile routers

Network mobility (NEMO) support is used to maintain the Internet connectivity of a group of terminals located into a network that changes its point of attachment to the Internet. The Internet access is made through a number of interfaces on a mobile router acting as a gateway of the mobile network. The overall bandwidth can be increased and redundancy can be provided by serving the mobile network through multiple mobile routers. However, this raises a number of issues related to multihoming. We therefore propose a multiple mobile router management (MMRM) system which allows nodes in the mobile network to be connected transparently to the Internet through multiple mobile routers. Mobile routers can dynamically join and leave the mobile network. They cooperate in order to share their Internet access within the entire mobile network. The proposed system is implemented and evaluated. Evaluation results show that the overhead of our system is negligible while redundancy and the overall bandwidth for the nodes in the mobile network are increased.

The In-vehicle Router System to support network Mobility

This paper proposes a communication system which ensures Internet connectivity and network transparency to a group of nodes with several network interface devices. We also implement this system as In-vehicle Router System. A vehicle consists of a group of nodes such as sensor nodes and devices held by passengers, is connected to the Internet through several network interface devices. It is typical for buses, trains, and airplanes to have such Mobile Internet environment, and the nodes in such vehicles have to change the attachment point of the Internet frequently. But the nodes would then not be able to maintain transport and higher-layer connections if it changes the attachment point. Thus, it is important to provide mobility support like Mobile IP. These nodes include low cost network appliances with only limited space for extra functions. It is preferred that a solution has no impact on these low cost nodes. Therefore, existing Host Mobility Protocol is not suitable for this situation. In this article, we propose the In-vehicle Router System as a solution to this situation by combining network mobility protocol with Interface switching system. We also implement and evaluate our system on the InternetITS testbed. We have confirmed that our system provides enough functionality to satisfy the requirements of Mobile Internet vehicles.

A policy management framework for flow distribution on multihomed end nodes

A multihomed node has several paths with its correspondent, maintained by several multihoming protocols. The decision to route a packet over a specific path relies on filter rules, which result from the comparison between the paths characteristics and the user policy. Multihoming protocols or their implementations provide various user interfaces to configure the filter rules. However, there is currently no method to describe user policy in terms of cost, bandwidth, delay and other network characteristics, and to compare this policy with the path characteristics. We thus propose in this paper a new framework for policy management for flow distribution, which offers a user interface to define policies and generates filter rules for each multihoming protocol. We first sort out the requirements for users in the multihomed environment. By reviewing some of the most important multihoming protocols and implementations, we show that they do not match all those requirements. We then propose a new policy management framework that fits those very requirements.

SHISA: The IPv6 Mobility Framework for BSD Operating Systems

Mobile IPv6 and network mobility basic support (NEMO BS) are the IETF standard mobility protocols for IPv6. When we consider the deployment of a new protocol, it is well understood that the existence of a free protocol implementation, which can be used as a reference implementation for both research and operation, plays important roles. SHISA is a free implementation of Mobile IPv6 and NEMO BS protocols built on top of BSD operating systems. The purpose of SHISA is to be a reference implementation of the mobility protocols and to accelerate the deployment. In this paper, we explain the background of the development, introduce the design and explain the implementation detail. SHISA consists of the modified kernel and the user space programs, which is a similar approach as the routing/forwarding mechanism implemented in many UNIX systems. We designed a new communication layer between kernel and a user space program and also between user space programs to exchange mobility related information. This design makes the implementation simple and extensible. SHISA also provides some advanced features such as multiple care-of address registration and IPv4 prefix support which will help the deployment in a real situation

Network Mobility from the InternetCAR Perspective

A number of devices, including sensors, mobile phones, and various computers will be deployed in next generation vehicles, and interconnected through an embedded in-vehicle network. These vehicles will be connected to the Internet as both a step toward ubiquitous computing and as a means to meet Intelligent Transportation Systems (ITS) needs. At first, a communication system is required to connect vehicles to the Internet. Such communication system is investigated in our InternetCAR project. For flexibility and ease of use, we advocate IPv6. This paper particularly focus on network mobility since network mobility support is mandated to maintain ongoing sessions as the in-vehicle embedded network changes its point of attachment to the Internet topology. We outline our testbed specifically designed for the purpose of demonstrating our proposed communication system and we detail our implementation based on Prefix Scope Binding Updates, the initial network mobility support solution proposed at the IETF before the NEMO working group was set up.