Design of an ATM switch for handoff support

Heechang Kim, H. Jonathan Chao

Research output: Contribution to journalArticle

Abstract

In a wireless ATM system, a network must provide seamless services to mobile users. To support this, mobility function should be added to existing ATM networks. Through a handoff operation, a mobile user can receive a service from the network without disconnecting the communication. A handoff results in connection path rerouting during an active connection. To avoid cell loss during a handoff, cell buffering and rerouting are required in the network. A handoff switch is a connection breakdown point on an original connection path in the network from which a new connection sub-path is established. It performs cell buffering and rerouting during a handoff. Cell buffering and rerouting can introduce a cell out-of-sequence problem. In this paper we propose a handoff switch architecture with a shared memory. The architecture performs cell buffering and rerouting efficiently by managing logical queues of virtual connections in the shared memory and sorting head-of-line cells for transmission, thus achieving in-sequence cell delivery during a handoff. We also present simulation results to understand the impacts of handoffs on switch performance.

Original languageEnglish (US)
Pages (from-to)411-419
Number of pages9
JournalWireless Networks
Volume6
Issue number6
DOIs
StatePublished - Dec 2000

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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