GD-aggregate: A WAN virtual topology building tool for hard real-time and embedded applications

Qixin Wang, Xue Liu, Jennifer Hou, Lui Sha

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


The convergence of computer and physical world calls for next generation Wide Area Network (WAN) infrastructures for hard real-time and embedded applications. Such networks need virtual topologies to achieve scalability, configurability, and flexibility. Virtual topologies are made of virtual links, for which, the state-of-the-art building tool is Guaranteed Rate server based aggregates (GR-aggregates). However, common-practice weight assignment scheme couples GR-aggregate End-to-End (E2E) delay bound with aggregate's data throughput inverse proportionally. This is undesirable for many hard real-time embedded sensing/actuating applications, whose traffic has small data throughput but requires short E2E delay. We propose Guaranteed Delay server based aggregates (GD-aggregates), which allow assigning weights according to priorities instead of data throughput. This decouples E2E delay guarantee from data throughput, hence meets the needs of hard realtime embedded applications. In addition, GD-aggregates can be analyzed with simple closed form formulae, and can be easily planned with optimization tools.
Original languageEnglish
Title of host publicationProceedings - 28th IEEE International Real-Time Systems Symposium, RTSS 2007
Number of pages10
Publication statusPublished - 1 Dec 2007
Externally publishedYes
Event28th IEEE International Real-Time Systems Symposium, RTSS 2007 - Tucson, AZ, United States
Duration: 3 Dec 20076 Dec 2007


Conference28th IEEE International Real-Time Systems Symposium, RTSS 2007
Country/TerritoryUnited States
CityTucson, AZ

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications

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