Fatma Ghandour

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The aim of this paper is to evaluate the performance of an energy aware routing protocol, called ECB-AODV (Energy Constraint protocol Based on AODV) which derives from the AODV protocol and which is based on the local decisions of intermediate stations to maintain the connectivity of the network as long as possible. The results obtained using the network(More)
In this paper, we propose an uplink resources allocation strategy for Long Term Evolution (LTE) systems. In time domain, the scheduler aims at ensuring more fairness by using a metric updated every new uplink transmission round, giving higher priority to users who are the farthest from their minimum QoS requirements. Then, resources are allocated in a way(More)
In this paper, we address the issue of providing service guarantees with EDCF in the 802.11 wireless local area networking standard. We suggest a new scheme to adjust the size of the contention window (CW). In fact, with the EDCF (enhanced distributed coordination function) mechanism introduced in the upcoming IEEE 802.11e standard, the CW is reset upon a(More)
The access technique of non real time services in 802.16 networks is generally based on multicast or broadcast polling and contentions resolution mechanisms. Thus, the major problem that faces this class of service is the number of collisions that occur between the bandwidth request messages of subscribers' stations (SSs). These collisions cause waste of(More)
This paper presents a new scheduling architecture for the uplink traffic in 802.16 systems. The proposed scheme is based on three main modules: a traffic supervisor that periodically checks the measured quality of service (QoS) parameters of each traffic flow, a packet scheduler that gives the unsatisfied flows the highest priority and a slot allocator that(More)
In this paper, we propose a pricing model for variable bandwidth demand services, combined by an optimized resources allocation strategy in an OFDMA based WiMAX systems. The users satisfaction level and the operator revenue are the two keys for the pricing scheme we propose. The relationship with the channels allocation is investigated and a two step based(More)
In this paper, we propose a new Call Admission Control (CAC) for 802.16 systems. The scheme is based on a dynamic adjustment of the bandwidth offered to all rtPS (Real time polling services) and nrtPS (Non real time plolling services) active connections, for each new connection establishment request in order to maximize the number of accepted connections,(More)
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