In this paper we analyze the performance of ADHOC MAC, a new MAC protocol proposed within CarTALK200, a European research project with the purpose to design novel solutions for inter-vehicle communications. ADHOC MAC has been devised to provide a reliable single hop broadcast channel overcoming the hidden terminal problem, and an effective multi hop broadcast service by exploiting the connectivity information provided by the protocol. The simulation results presented in the paper prove the effectiveness of ADHOC MAC in terms of access delay to the shared resource and resource reuse when considering a single hop broadcast service. The efficiency of the multi-hop broadcast service is compared through simulation with flooding and with a centralized greedy heuristics that gives an upper bound to the performance. Results show that the distributed ADHOC-MAC multi-hop broadcast mechanism performs closely to the centralized greedy heuristics
In this paper we propose SPARE MAC, a TDMA based medium access control (MAC) scheme for data diffusion in Wireless Sensor Networks (WSNs). The rationale behind SPARE MAC is to spare energy through limiting the impact of idle listening and traffic overhearing. To this extent, SPARE MAC implements a distributed scheduling solution which assigns to each sensor specific radio resources (i.e., time slots) for reception, summarized as Reception Schedules (RS), and spreads the information of the assigned RS to neighboring sensors. A transmitting sensor can consequently become active in correspondence of the RS of its intended receiver only. We analyze the performance of SPARE MAC in terms of throughput, power consumption, and data delivery delay both through analytical models and through detailed simulations. Moreover, we compare the performance of SPARE MAC against SMAC
Abstract-A cross-layer communication protocol called VSN-Module is introduced for Wireless Video Sensor Networks based on UltraWideBand (UWB) radio technology at the physical layer. The core of our solution is a distributed path reservation scheme which routes video traffic from sources (sensors) to a sink. The path establishment takes into account the specific requirements of video flows such as bandwidth, end-to-end delay and jitter, as well as the current status of the traversed devices such as the available bandwidth, the energy consumption, and the quality of the wireless channels. Simulation experiments are carried out and the performance of the VSN-Module is evaluated in terms of maximum end-to-end delivery delay, maximum delay jitter, and power consumption, under different video flow requirements.
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