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To exploit the strengths of both the physical and the protocol interference models and to understand the varying observations on the relative goodness of scheduling based on the two models in literature, we analyze how network traffic, link length, and wireless signal attenuation affect the optimal instantiation of the protocol model. We also identify the inherent tradeoff between reliability and...
The use of directional antennae in ad hoc networks has received growing attention in recent years. However, most existing directional MAC protocols assume interchangeable directional and omnidirectional modes of operation. Such operation reduces the spatial gain and introduces the asymmetry-in-gain problem. In this paper, we propose a directional-to-directional (DtD) MAC protocol for ad-hoc networks...
This paper investigates the deployment of amplify-and-forward (AaF) repeaters to enhance slot-ALOHA based random access in a single-cell environment. Based on the concept of ldquovulnerability circlerdquo introduced by Abramson [1], we derive the probability of correct reception of a random access packet originated from any position within the cell. The derived probability enables us to analyze the...
In this paper, we propose a new MAC protocol to effectively exploit spatial reuse of IEEE 802.11 distributed coordination function (DCF). The existing DCF node simply blocks its transmission if the medium is sensed to be busy. Thus, it is inefficient in terms of the network throughput due to overcautious estimation of the interference. The proposed spatial reuse DCF (SRDCF) employs the information...
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