期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2007
卷号：7
期号：10
页码：82-89
出版社：International Journal of Computer Science and Network Security
摘要：Most existing broadcasting protocols for ad hoc and wireless sensor networks use the standard Unit Disk Model (UDM) to represent the physical layer. Whenever this model does not take into account the fluctuations of radio signal, these protocols must be modified to adapt to transmissions in a real environment. In this paper, we apply the Log-Normal Shadowing Model (LNSM) to represent a realistic simulation environment and focus our study particularly on the performance of broadcasting Multipoint Relay Protocol (MPR). Thus, using LNSM we conduct extensive simulations to illustrate the effects of radio signal fluctuations on protocol performance. Unfortunately, our findings show that fluctuation presence has a significant impact on protocol performance. Hence to improve these performances, within this framework we propose two schemes: the first one optimizes the probability of successful reception by the selected neighborhood as relay nodes, and the second uses one probability threshold to select the relay nodes and another to maximize the probability of correct reception by two-hop neighbors of the source node. Finally, simulation results are presented, showing that our schemes provide a better performance over the ideal model.
关键词：Ad hoc Networks; Multipoint Relays; Log-Normal Shadowing Model; Unit Disk Model; Wireless Sensor Networks
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