The Multiple Prioritized Access Mechanism of Cognitive Networks
Developments of wireless communication tech-nology need higher standards of reliability of network and full utilization of resources. The proposition of Cognitive Network improves the utilization of frequency spectrum effectively. Main tasks of this paper are to introduce EDCA mechanism into the Cognitive Networks and validate if it can guarantee the classified service access effectively. First of all, we develop an access control for the Cognitive Net-works, which adapts the EDCA mechanism of WLAN and sets different priorities for Cognitive users. Secondary, we propose a new prioritized access control algorithm for Cognitive Network, which adapts Linear Backoff Algo-rithm, Stall Avoidance Scheme etc. to enhance the perfor-mance. Finally, we use and extend NS2 to satisfy the Mul-ti-priority access with multi-interface and multi-channel. Primary User and Cognitive Users connect to the same node, which satisfies multi-interface and multi-channel. We can reach the conclusion that the performance of Cognitive Network used mechanism of EDCA is better than that of used mechanism of DCF. The spectrum utilization of Cog-nitive Network is higher than that of Non-cognitive Net-work. Primary Users would not be interfered by Cognitive User.
Cognitive Network Cognitive User Primary User EDCA
Xiaoli Liu Shaohai Hu Yang Xiao Yanchang Liu
Institute of Information Science, Beijing Jiaotong University, Beijing, China
国际会议
北京
英文
168-172
2010-09-26（万方平台首次上网日期，不代表论文的发表时间）