Cross-layer modeling of capacity in wireless networks: Application to UMTS/HSDPA, IEEE802.11 WLAN and IEEE802.16 WiMAX

Authors:
Mariana Dirani;Chadi Tarhini;Tijani Chahed
Affiliations:
GET/Institut National des Télécommunications, UMR CNRS 5157, 9 rue C. Fourier, 91011 Evry Cedex, France;GET/Institut National des Télécommunications, UMR CNRS 5157, 9 rue C. Fourier, 91011 Evry Cedex, France;GET/Institut National des Télécommunications, UMR CNRS 5157, 9 rue C. Fourier, 91011 Evry Cedex, France
Venue:
Computer Communications
Year:
2007

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Abstract

We investigate in this work the cross-layer modeling of the capacity of wireless systems in the presence of two types of flows: streaming and elastic, under a dynamic configuration wherein users join the system and leave it after a finite duration. For streaming traffic, this duration is independent of the resources these flows get from the network. This is not the case of (TCP-based) elastic traffic whose flows have a service rate that is proportional to the share of resources each flow gets from the network, as obtained in a cross-layer manner from lower layers. We focus in this paper on the MAC/PHY layer and consider three different types of scheduling: CDMA with opportunistic scheduling, used in UMTS/HSDPA, CSMA/CA in use in IEEE802.11 WLAN and OFDMA as in IEEE802.16 WiMax.