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This article presents a new MAC layer protocol for IEEE 802.11 EDCA-based ad-hoc networks with hidden nodes. The key idea of the proposed solution is based on an intelligent two-step reservation procedure which is combined with the advantages of EDCA service differentiation. The new protocol achieves significant performance improvement for high priority traffic (e.g., Voice) in terms of fairness,...
Interoperability between heterogeneous wireless access networks will help the operators to improve the quality of service offered to the users and the networks resource utilization. Media Independent Handover (MIH) standard is designed by IEEE to optimize the handover between heterogeneous networks. This paper presents a solution for mobility management in heterogeneous networks which is based on...
In this paper, we propose a Medium Access Control (MAC) extension, called Medium Access for Contention Assistance (MACAT), to enhance Quality-of-Service (QoS) for IEEE 802.11 and IEEE 802.11e co-existing networks. In MACAT, IEEE 802.11e stations act as assistants for channel access of legacy stations with real-time traffic. With the assistance of 802.11e stations, the legacy stations have a higher...
The new IEEE 802.11 standard version, denoted by 802.11e, was developed in order to introduce mechanisms enabling handling of real time applications in the network. The proper work of the EDCF protocol is influenced by the presence of hidden stations in the network. These nodes may produce a significant increase of the number of collisions. The first part of this paper contains short descriptions...
Token-passing medium access control (MAC) protocols are gaining interest among wireless ad hoc network researchers as they provide unrivaled advantages over the existing IEEE 802.11 standards. This paper introduces a hybrid token-code division multiple access (CDMA) MAC protocol that is based on a token-passing scheme with the incorporation of CDMA. With its unique CDMA feature, the proposed MAC is...
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