The divergence of people's demands and technologies has been fueling the proliferation of vertically integrated "silo type" systems. In order to maintain systematic simplicity, a common layer is necessary, which is used to quickly develop new applications. This paper discusses the requirements of the service delivery platform (SDP) as the common layer, and proposes our SDP named SPACE. The architecture of SPACE is based on the SOA concept, which provides reusable service elements and an open interface for applications. SPACE includes layered service elements and a messaging function to connect the service element and application. Other key technologies are consistency management and resource control SPACE creates new values for many players, based on information over a wide area and networking capabilities. However, sometimes the requested application processes incompletely because of the instability of the wireless communication path and the conflict of the device control Consequently, the SPACE resource will be wasted and additional delay will be caused. To overcome this issue, we propose a resource control mechanism which controls the processing order of service elements. Evaluation results show that the mechanism can reduce processing time in the entire platform system.

The number of the mobile subscribers has been increasing. At the same time, the scale of the Internet is still rapidly increasing. This means that the next generation of mobile networks should handle not only voice but also multimedia data, including still images and video based on the IP protocol, without restriction. We propose a mobile network architecture for the multimedia age based on a mixed model of ATM connectionless and connection-oriented method. We also propose an efficient mobility management mechanism and analyze its effectiveness by simulation.

Intelligent routing control is defined as the process in which the network interrogates the databases containing the relationships between logical numbers, such as personal or information identifiers, and physical addresses in the transport network to find the terminal having the information required to process a user request. The routing control system presented uses distributed databases, each of which manages a switching system and all of which are connected through high-speed signalling networks separate from the transport network. If the requested physical address cannot be found in one database, search requests are distributed at the same time to all other databases. For up to 100 million subscribers, the routing control system can find a physical address within 1 s when each database uses ten memories accessed at 200 ns with an interdatabase linkage speed of 14 Mb/s.>

A key point in realizing broadband switching networks is architectual efficiency for switching various types of traffic with speeds ranging from several kbits/s to several Mbits/s. We propose a new switching technique, that is, a high-speed time division switching based on the single slot switching technique. This technique has several switching modules corresponding to standardized bit rates of traffic, and each cell is switched in the switching module corresponding to its speed. With this technique, all types of traffic will be equivalent with respect to the grade of service. This paper outlines its principle, clarifies the performance of traffic capacity,and finally proves its feasibility.