GloMoSim: a library for parallel simulation of large-scale wireless networks
PADS '98 Proceedings of the twelfth workshop on Parallel and distributed simulation
Performance of Collision Avoidance Protocols in Single-Channel Ad Hoc Networks
ICNP '02 Proceedings of the 10th IEEE International Conference on Network Protocols
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This paper presents an analytic model for evaluating the saturation throughput of our QoS-aware MAC protocol that tries to support real-time traffic over multihop mobile ad hoc networks (MANETs). A MAC based on the distributed coordination function (DCF) of IEEE 802.11 a/b is mostly prevalent in MANETs, and such scheme has been primarily designed to support elastic data applications. In order to support the transmission of real-time traffic, a polling-based scheme called the point coordination function (PCF) was introduced in IEEE 802.11. However, PCF is normally used in infrastructure-based networks. In our approach, spread spectrum techniques and collision avoidance multiple access protocols are combined to form a new MAC protocol that makes use of the PCF-based operation of IEEE 802.11 for the first time in multihop MANETs. The resulting scheme guarantees priority to real-time traffic, and provides bounded access delays to real-time stations. The analytical and simulation results show the performance improvements of our strategy.