Supporting Real-Time Applications in an Integrated Services Packet Network: Architecture and Mechanism
by David D. Clark, Scott Shenker, Lixia Zhang
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| year: | 1992 | | journal: | SIGCOMM92 | | annote: | David D. Clark (Laboratory for Computer Science; Massachusetts Institute of Technology); Scott Shenker (Palo Alto Research Center; Xerox Corporation); Lixia Zhang (Palo Alto Research Center; Xerox Corporation); | | month: | aug | | series: | SIGCOMM | | publisher: | ACM Press | | pages: | 14--26 | | volume: | 22(4) | | type: | misc | | booktitle: | SIGCOMM | | address: | Baltimore | | abstract: | 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 measured 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. |
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