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Sensors 2016, 16(2), 216;

Evaluation of the Effects of Hidden Node Problems in IEEE 802.15.7 Uplink Performance

Institute for Technological Development and Innovation in Communications, Edificio Polivalente II, 2aplanta, Parque Científico y Tecnológico, Campus Universitario de Tafira, Las Palmas de Gran Canaria 35017, Spain
Department of Telematic Engineering, University of Las Palmas de Gran Canaria, Campus Universitario de Tafira, Las Palmas de Gran Canaria 35017, Spain
Authors to whom correspondence should be addressed.
Received: 9 December 2015 / Revised: 28 January 2016 / Accepted: 30 January 2016 / Published: 6 February 2016
(This article belongs to the Section Sensor Networks)
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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 Wireless Personal Area Networks based on VLC. Due to limitations in the coverage of the transmitted signal, wireless networks can suffer from the hidden node problems, when there are nodes in the network whose transmissions are not detected by other nodes. This problem can cause an important degradation in communications when they are made by means of the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access control method, which is used in IEEE 802.15.7 This research work evaluates the effects of the hidden node problem in the performance of the IEEE 802.15.7 standard We implement a simulator and analyze VLC performance in terms of parameters like end-to-end goodput and message loss rate. As part of this research work, a solution to the hidden node problem is proposed, based on the use of idle patterns defined in the standard. Idle patterns are sent by the network coordinator node to communicate to the other nodes that there is an ongoing transmission. The validity of the proposed solution is demonstrated with simulation results. View Full-Text
Keywords: IEEE802.15.7; VLC; MAC; CSMA/CA; Hidden node problem IEEE802.15.7; VLC; MAC; CSMA/CA; Hidden node problem

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Ley-Bosch, C.; Alonso-González, I.; Sánchez-Rodríguez, D.; Ramírez-Casañas, C. Evaluation of the Effects of Hidden Node Problems in IEEE 802.15.7 Uplink Performance. Sensors 2016, 16, 216.

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