Integrated service by Distributed Queue Switch Architecture

Distributed Queue Switch Architecture has the potential to best satisfy requirements for next generation network service. The features of DQSA are higher performance with minimum delay for time-sensitive traffic, flexible switching for Quality of Service, and the scalability to large networks. This dissertation first introduces the Collision Decomposition Rule which is to provide a performance analysis on the impact of bursty traffic to the stability of the system. With the help of the DQRAP State Transition Matrix, we can estimate the best and worst case of the collision resolution length for the performance of the queueing contention resolution subsystem. This thesis demonstrates that the performance of a DQLAN system in an integrated traffic environment is superior to that of an Ethernet system. A crucial issue for the integration of voice and data is how to maintain the quality of service communication while achieving high data transmission performance. DQSA statistically multiplexes voice and data packets over a slotted channel by assigning normal priority for data packets and high priority for voice packets. A packet in the high priority queue always transmits before a packet in the normal priority queue. Technology convergence signifies the move toward common networking technologies that satisfy both LAN and WAN requirements. XDQRAP is used in simulation to identify that DQSA is insensitive to network size and can be deployed in LAN and WAN environments for integrated service.