Recent trends in the telecommunication industryhave been moving toward the development of ubiquitous informationsystems, where the provision of a plethora of advancedmultimedia services should be possible, regardless of time andspace limitations. An efficient and seamless delivery of multimediaservices over various types of wireless networks is still a challengingtask. The underlying difficulty consists of the disparityin the bandwidth availability over each network type. Indeed,the fundamental challenge upon a handoff phenomenon in aheterogeneous wireless network consists of an efficient probingof the bandwidth availability of the new network, followed by aprompt adjustment of the data delivery rate. This paper presentsa cross-layer approach that involves five layers, namely, physical,data link, application, network, and transport layers. The threeformer layers are used to anticipate the handoff occurrence and tolocate the new point of attachment to the network. Based on theirfeedback, the transport layer is used then to probe the resourcesof the new network using low-priority dummy packets. Being themost widely used protocol for multimedia delivery, this paper addressesmultimedia applications based on the Transmission ControlProtocol (TCP) and the Real-time Transport Protocol (RTP).The design of the whole cross-layer architecture is discussed, andenhancements to the two protocols are proposed. The performanceof the enhanced TCP and the RTP are evaluated and comparedagainst existing schemes through extensive simulations. The obtainedresults are encouraging and promising for the delivery ofmultimedia services in heterogeneous wireless networks.

A Cross-Layer Approach for an Efficient Delivery of TCP/RTP-based Multimedia Applications in Heterogeneous Wireless Networks

PALAZZO, Sergio;
2008-01-01

Abstract

Recent trends in the telecommunication industryhave been moving toward the development of ubiquitous informationsystems, where the provision of a plethora of advancedmultimedia services should be possible, regardless of time andspace limitations. An efficient and seamless delivery of multimediaservices over various types of wireless networks is still a challengingtask. The underlying difficulty consists of the disparityin the bandwidth availability over each network type. Indeed,the fundamental challenge upon a handoff phenomenon in aheterogeneous wireless network consists of an efficient probingof the bandwidth availability of the new network, followed by aprompt adjustment of the data delivery rate. This paper presentsa cross-layer approach that involves five layers, namely, physical,data link, application, network, and transport layers. The threeformer layers are used to anticipate the handoff occurrence and tolocate the new point of attachment to the network. Based on theirfeedback, the transport layer is used then to probe the resourcesof the new network using low-priority dummy packets. Being themost widely used protocol for multimedia delivery, this paper addressesmultimedia applications based on the Transmission ControlProtocol (TCP) and the Real-time Transport Protocol (RTP).The design of the whole cross-layer architecture is discussed, andenhancements to the two protocols are proposed. The performanceof the enhanced TCP and the RTP are evaluated and comparedagainst existing schemes through extensive simulations. The obtainedresults are encouraging and promising for the delivery ofmultimedia services in heterogeneous wireless networks.
File in questo prodotto:
File Dimensione Formato  
TVT.pdf

solo gestori archivio

Tipologia: Versione Editoriale (PDF)
Licenza: Non specificato
Dimensione 1.49 MB
Formato Adobe PDF
1.49 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/54020
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 22
social impact