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The authors are advocating the "Minimum Core" architecture toward New Generation Network (NWGN). In the architecture, network functionalities in the core network (e.g. mobility management, session control and application servers) are minimized by shifting them to access networks. This approach ensures high scalability essential for future networks. This paper proposes a session control method for the "Minimum Core", in which the call-setup time is guaranteed by cooperating core and overlay networks while minimizing processing and traffic load on the core network. In this method, latency on the overlay network is estimated prior to the session being established. If the estimated latency is desirable, the overlay network is utilized and otherwise the core system. This paper also proposes a blacklist scheme, which realizes on-the-fly decisions of the latency without increasing measurement traffic on the overlay network. Evaluation results on a developed test-bed system show the proposed methods drastically suppress the probability of call-setup time exceeding the desired time, and also mitigate the processing burden of the core compared to current centralized architecture.This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE "GLOBECOM" 2009 proceedings.978-1-4244-4148-8/09/$25.00 ©2009 Fig. 11. Probability of CST less than 3[sec] when changing join/leave interval (2,000 peers)This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the IEEE "GLOBECOM" 2009 proceedings.

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This paper proposes an ID composition for fast location lookup in overlay nodes. In the paper, we assume a location-based routing system constructed on an overlay network. While the overlay approach facilitates network deployment, recent DHT (Distributed Hash Table) technologies allow us to construct robust and high-scalable distributed systems. The point of our proposal is how to map physical location with ID space in DHT. The proposed ID composition realizes fast location lookup only by bit comparisons of IDs. Performance evaluations show that the processing time of location lookup is less than 5 microseconds, even when the number of registered locations is 1 million. The ID composition also allows unicast and multicast transport operations to support both service discovery and information delivery. In addition, this paper discusses how to effectively conduct information delivery within a circular area. Two rules, such as the 4-packet rule and rectangle rule, reduce communication traffic between overlay nodes and receivers to be one third of the simplest method.

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Personal devices and access systems have recently become more diversified, and there is a need for technology that enables users to flexibly and securely create their own private services in a user-driven manner, utilizing the presently available access systems and devices. To this end, the authors have designed User-driven Service Creation Architecture (USCA). It enables users to create a secure private network as a substrate for such services. This network is called a Personal Network (PN) and is an extension of the concept of Personal Area Network (PAN). It is organized by the personal devices related to services that users wish to enjoy or offer. This paper focuses on the security issue of USCA: how to certify the eligibility of users or devices wishing to join a PN. It proposes a device authentication and registration method, with the assistance of cellular systems, IMS/MMD (IP Multimedia System/ MultiMedia Domain). By means of this method, users can bind the correctness of devices to their cellular phone, and can thus create secure PNs only with solicited devices.