In this paper the authors present a simulation study of two 802.11e network scenarios. The presented analysis is not only novel but most of all crucial for understanding how a theoretically simple star topology network can be degraded by the presence of hidden nodes. The authors discuss the results obtained during the analysis of two different star topologies where the hidden node problem exist...

The structure learning is one of the main concerns in studies of the Bayesian networks. In the present paper, we consider the network consisting of both observable and hidden nodes, and propose a method to investigate the existence of a hidden node between two observable nodes, which is the model selection problem between the networks with and without the middle hidden node. When the network in...

many performance evaluations for ieee 802.11distributed coordination function (dcf) have been previouslyreported in the literature. some of them have clearly indicatedthat 802.11 mac protocol has poor performance in multi-hopwireless ad hoc networks due to exposed and hidden nodeproblems. although rts/cts transmission scheme mitigatesthese phenomena, it has not been successful in thoroughlyomit...

The optimistic consistency scheme has been established with respect to data consistency and availability in distributed systems. Wireless networks are becoming popular in data communication and suitable for data sharing among users using multicast capability, but have hidden node problems. This paper proposes a simple data coherency protocol for mobile devices that is less data traffic in data ...

In the last few years, the increasing use of LEDs in illumination systems has been conducted due to the emergence of Visible Light Communication (VLC) technologies, in which data communication is performed by transmitting through the visible band of the electromagnetic spectrum. In 2011, the Institute of Electrical and Electronics Engineers (IEEE) published the IEEE 802.15.7 standard for Wirele...

To avoid collisions, IEEE 802.11 medium access control (MAC) uses predetermined inter-frame spaces and the random back-off process. However, the retransmission strategy of IEEE 802.11 MAC results in considerable time wastage. The hidden node problem is well known in wireless networks; it aggravates the consequences of time wastage for retransmission. Many collision prevention and recovery appro...

Wireless Sensor Networks (WSNs) emerge as underlying infrastructures for new classes of large-scale networked embedded systems. However, WSNs system designers must fulfill the Quality-of-Service (QoS) requirements imposed by the applications (and users). Very harsh and dynamic physical environments and extremely limited energy/computing/memory/communication node resources are major obstacles fo...

In this paper, for the first time, an analytic model is built to derive broadcast packet reception ratios (PRRs) in IEEE 802.11 based general two-dimensional (2-D) mobile ad-hoc networks (MANETs). First, the reception probability that a node within transmission range of a sending node receives the broadcast message successfully is computed. Then, the PRRs are derived through integration of the ...