Istituto di Scienza e Tecnologie dell'Informazione     
Barsocchi P., Oligeri G., Potortý F. Frame error model in rural (Wi-Fi) networks. In: 5th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks. WIOPT 2007 (Limassol, Cipro, 16-20 aprile 2007). Proceedings, IEEE, 2007.
Commonly used frame loss models for simulations over Wi-Fi channels assume a simple double regression model with threshold. This model is widely accepted, but few mea- surements are available in the literature that try to validate it. As far as we know, none of them is based on field trials at the frame level. We present a series of measurements for relating transmission distance and packet loss on a Wi-Fi network in rural areas and propose a model that relates distance with packet loss probability. We show that a simple double regression propagation model like the one used in the ns-2 simulator can miss important transmission impairments that are apparent even at short transmitter-receiver distances. Measurements also show that packet loss at the frame level is a Bernoullian process for time spans of few seconds. We relate the packet loss probability to the received signal level using standard models for additive white Gaussian noise channels. The resulting model is much more similar to the measured channels than the simple models where all packets are received when the distance is below a given threshold and all are lost when the threshold is exceeded.
URL: http://fly.isti.cnr.it/curriculum/pot_abstracts.html#C24:Rural-model-Winmee07
Subject NS2
Frame error rate
C.2 Computer-Communication Networks

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