Supporting real-time applications in an Integrated Services Packet Network: architecture and mechanism

  • Authors:
  • David D. Clark;Scott Shenker;Lixia Zhang

  • Affiliations:
  • -;-;-

  • Venue:
  • SIGCOMM '92 Conference proceedings on Communications architectures & protocols
  • Year:
  • 1992

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This paper considers the support of real-time applications in an Integrated Services Packet Network (ISPN). We first review the characteristics of real-time applications. We observe that, contrary to the popular view that real-time applications necessarily require a fixed delay bound, some real-time applications are more flexible and can adapt to current network conditions. We then propose an ISPN architecture that supports two distinct kinds of real-time service: guaranteed service, which is the traditional form of real-time service discussed in most of the literature and involves pre-computed worst-case delay bounds, and predicted service which uses the measure performance of the network in computing delay bounds. We then propose a packet scheduling mechanism that can support both of these real-time services as well as accommodate datagram traffic. We also discuss two other aspects of an overall ISPN architecture: the service interface and the admission control criteria.