Hend Koubaa

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  • Hend Koubaa
  • 2009 IEEE 20th International Symposium on…
  • 2009
Multiuser diversity (MUD) underlies much of the recent work on both, unicast and multicast scheduling design in wireless networks. In that context, a large channel variation among users is not a drawback. In the case of unicast, the user with the best quality channel can access the medium while the other users can wait for a better quality channel. In the(More)
We propose a new multicast access scheme that is founded on a metric that allows high-throughput multicast in MANETs. The new access metric, called MOST (as Maximum Opportunistic Scheduling scheme Throughput), is computed for each multicast session and utilized to find the optimal number of transmissions and the best set of transmission data rates to use in(More)
In wireless mobile ad-hoc networks, data packets have to be relayed hop by hop from a given source node to a destination node. This means that some or all of the mobile nodes must accept to forward information for the benefit of other nodes. It has been shown by F. Nait-Abdesselam, et al., (2003) that this ability of forwarding packets leads to a new(More)
The broadcast nature of the wireless medium makes multicast communication subject to various challenges, especially the unreliability due to the interference [2] and the impact of the transmission data rate choice on the conflicts between communicating users. In fact, a fundamental trade-off exists between communication speed (transmission data rate) and(More)
In a wireless network, the signals transmitted between a source station and different receiver users most often have different channel fluctuation characteristics. This diversity that exists between users is named multiuser diversity (MUD) and can be exploited to improve the capacity of wireless networks. One way of exploiting MUD is by opportunistic(More)
Multicast routing is a fundamental issue in wireless networks and related routing strategies should select the lowest number of parallel conflicting transmissions. However, current works on this problem accounts only for conflicts occurring within the transmission ranges of the nodes. Particularly, no work is interested in studying conflicting transmissions(More)
While low transmission delays can meet the requirements of many applications, high throughput is the appeal of several others. Accordingly and taking into account the multi-user diversity (MUD) and the wireless broadcast advantage (WBA) features, we will address the problem of providing the maximum throughput while guaranteeing an acceptable transmission(More)
This paper presents the Adaptive Spectrum Opportunity Access (ASOA) scheme. The proposed scheme greatly improves spectrum utilization and provides improved QoS for the secondary users. The secondary data delivery time is adapted in different spectrum opportunities through ASOA scheme based on the estimated collision rates in a sophisticated way. The(More)