Design, analysis, and evaluation of an improved scheme for ATM burst-level admission control

  • Authors:
  • W.Melody Moh;Usha Rajgopal;Asha Dinesh

  • Affiliations:
  • Department of Mathematics and Computer Science, San Jose State University, San Jose, CA 95192-0103, USA;Tandem Computers, Inc., Santa Clara, CA 95051, USA;Octel Communications Co., Milpitas, CA 95035, USA

  • Venue:
  • Computer Communications
  • Year:
  • 1997

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Abstract

Fast reservation protocols (FRP) have been under consideration for burst-level admission control and block transfer in both ATM LAN and WAN. In this paper we propose a modification to the FRP and the FRP/IT (Immediate Transmission). The resulting protocols, named MFRP (Modified FRP) and MFRP/IT (Modified FRP/IT), are based on bandwidth negotiation between the source and a fast server at the network. Initially, the source requests a desired rate and an acceptable minimum rate. If the network can support at least the minimum rate, it sends an acknowledgment with a granted rate, otherwise a negative acknowledgment is sent. The new mechanism thus uses one extra parameter in both the request and the acknowledgment, but requires no more complicated control mechanism at the network server than the original FRP and FRP/IT protocols. We present mathematical analysis of the new scheme in terms of blocking probability, delay, and wasted bandwidth in unsuccessful multipoint requests. Using computer simulation, the performance of the new protocols are also evaluated and compared with existing protocols: the original FRP, the Adaptive FRP (AFRP), and the FRP/IT. The simulation environment includes both single-stage and multi-stage ATM LAN and WAN for single-rate and multi-rate traffic streams. Simulation results show that the new protocols significantly reduce blocking probability, and, as a result, improve network throughput and message delay; which agrees with what the analysis suggests. Applications of the proposed schemes to block transfer in ATM networks and traffic control in wireless ATM networks are also discussed.