Showing papers in "IEICE Transactions on Communications in 1998"

Architectural choices in large scale ATM switches

Abstract: The rapid development of Asynchronous Transfer Mode technology in the last 10-15 years has stimulated renewed interest in the design and analysis of switching systems, leading to new ideas for system designs and new insights into the performance and evaluation of such systems. As ATM moves closer to realizing the vision of ubiquitous broadband ISDN services, the design of switching systems takes on growing importance. This paper seeks to clarify the key architectural issues for ATM switching system design and provides a survey of the current state-of-the-art.

A Novel Transmission Diversity System in TDD-CDMA

Abstract: This paper presents a novel transmission diversity scheme for code division multiple access system. Conventional diversity receivers in mobile stations require space and complicated circuits, however, the proposed diversity schemes presents significant diversity effect without any diversity equipment at the mobile station. It is possible to use the transmitter diversity at the base station by using the feature of time division duplex (TDD) which has strongly correlated fading patterns in both forward and reverse link. Computer simulation is performed to evaluate the performance of the proposed systems for single user environment. The performance of the system 1 is analyzed and the BER performance for the multiple access is presented.

Quality of Service Guarantees and Charging in Multiservice Networks

Abstract: Quality of service requirements are satissed conjointly by the service model, which determines how resources are shared and by network engineering , which determines how much capacity is provided. In this paper we consider the impact of the adopted charging scheme on the feasibility of fulllling QoS requirements. We identify three categories of charging scheme based respectively on at rate pricing, congestion pricing and transaction pricing.