Yoshinori Saida

An extensible browser architecture for mobile terminals

The number of mobile terminals with a Web browser has increased in recent years, and many diverse mobile services using the Internet have evolved. However, there are still limitations such as that it is difficult to change or replace browser functionalities in mobile terminals. This is a factor in service providers being unable to freely provide services. We propose an extensible browser architecture (EBA) to extend the browser functions. The EBA consists of two layers: browser foundation and browser application layer. The browser foundation layer provides the core functions of the browser as Java class libraries. The browser applications, which are written in the Java language and downloadable, utilize modules using the browser class libraries in the browser foundation layer to provide a variety of browser applications. Several applications demonstrate the effectiveness of the EBA.

Design of SMIL browser functionality in mobile terminals

SMIL is a markup language which enables us to describe multimedia contents. This paper proposes a design model of SMIL browser functionality for mobile terminals whose resources are limited. We introduce SMIL Component, which is based on attachable software architecture to a pre-installed generic web browser. This leads to reduce memory size that SMIL Component consumes and bring high adaptability of SMIL Component for various web browsers. We implement SMIL Component and evaluate RAM sizes and presentation delays. As a result, we found out that SMIL Component can be useful for MMS presentations on mobile terminals.

VNode infrastucture enhancement — Deeply programmable network virtualization

We introduce the latest extended functions for the VNode infrastructure. We present new extended VNode infrastructure functions that achieve high performance and provide convenient deep programmability to network developers. In addition, we extend network virtualization from the core network to edge networks and terminals. We deploy an enhanced VNode infrastructure on the JGN-X testbed in evaluation experiments. We also succeeded to create international federation slice between GENI and Fed4FIRE.

STCoS: Software-defined traffic control for smartphones

Applications can be freely developed and installed into smartphones. Furthermore, smartphones can utilize various networks like private WiFi networks. Such openness of smartphones means that their traffic is uncontrollable for both carriers and users. This creates various problems such as network overloads and security risks that degrade user experience. To address the issue of uncontrollability, we propose STCoS, a software-defined, i.e., programmable, traffic control scheme for smartphones. STCoS is designed to work standalone basis in a smartphone for ease of deployment. It is also designed to have a layered architecture with a well-defined API for improved programmability. STCoS directs traffic of smartphone applications to the appropriate network interface, monitors the traffic, and filters the traffic as needed. It enables control logic to be implemented in the form of a smartphone application. The programmability facilitates real-time traffic control on a moment-to-moment basis. Thus STCoS recovers controllability on smartphone traffic with simple programming. Control logic implementation in example programs, such as a sophisticated WiFi offloading program, demonstrated that STCoS can be used to easily program traffic control. Implementation of STCoS in an Android smartphone demonstrated that the overhead of STCoS is low enough for practical use.