tailieunhanh - Báo cáo hóa học: " Delay-throughput analysis of multi-channel MAC protocols in ad hoc networks"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Delay-throughput analysis of multi-channel MAC protocols in ad hoc networks | Nieminen and Jantti EURASIP Journal on Wireless Communications and Networking 2011 2011 108 EURASIP Journal on . http content 2011 1 108 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Delay-throughput analysis of multi-channel MAC protocols in ad hoc networks Jari Nieminen and Riku Jantti Abstract Since delay and throughput are important Quality of Service parameters in many wireless applications we study the performance of different multi-channel Media Access Control MAC protocols in ad hoc networks by considering these measures in this paper. For this we derive average access delays and throughputs in closed-form for different multi-channel MAC approaches in case of Poisson arrivals. Correctness of theoretical results is verified by simulations. Performance of the protocols is analyzed with respect to various critical operation parameters such as number of available channels packet size and arrival rate. Presented results can be used to evaluate the performance of multi-channel MAC approaches in various scenarios and to study the impact of multichannel communications on different wireless applications. More importantly the derived theoretical results can be exploited in network design to ensure system stability. I. Introduction Multi-channel communications form the basis of various future wireless systems such as cognitive radio next generation cellular and wireless sensor networks WSNs . The reason for this is that the performance of a wireless network can be improved by exploiting multiple frequency channels simultaneously to ensure robustness minimize delay and or enhance throughput. In general performance of multi-channel networks is heavily dependent upon used Media Access Control MAC protocols and efficient medium access schemes are considered as an essential part of any power-limited self-configurable wireless ad hoc network 1 . Furthermore delay and throughput are important Quality of Service .