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This paper proposes a MAC protocol using multiple control channels for multi-channel ad-hoc network. In the proposed protocol, all channels are divided into some groups. Each group has a control channel. All nodes hops the control channels for searching a receiver. Because of using multiple control-channels, control frame collisions and the effect of searching overhead are mitigated in the proposed...
A hidden-node problem is one of the major challenges that cause severe performance degradation in wireless ad-hoc networks. Even though RTS/CTS (Request To Send/Clear To Send) exchange can remove the hidden-node problem, the inefficiency of exchanging the RTS/CTS has brought attentions to many researchers. While most of these efforts have been focused on the theoretical analysis, very little efforts...
In this paper, we present an analysis model for the estimation of channel utilization for IEEE 802.11 ad hoc networks under saturated conditions in the presence of hidden terminals. We give a way to calculate the saturated throughout of multi-hop scenario. The ns-2 simulation results show the effectiveness of our analytical approach.
The aim of this paper is to use analytical means to discover the effective functional range of a node in Wireless Mesh Networks (WMNs) and to determine the optimized position of the relaying node when placed between two mesh routers in WMNs. A simple source to destination model with two transmission distance schemes and simple relaying node model with three relaying node position schemes were designed...
Recent experimental results have shown that the minimum signal-to-interference ratio required at a receiver (CPth) depends on the order of arrivals of overlapping frames, and it is much less when the sender's frame arrives earlier. With such differentiating capture capable receivers, in this paper we reconsider the optimal choice for carrier sense range rs of wireless nodes. Through simple analysis...
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...
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