切换是移动网络最重要的技术之一,直接影响着通信系统的整体性能。研究了IEEE 802.16e系统基于CINR(Carrier to Interference+Noise Ratio,载波干扰噪声比)的软切换机制,提出绝对门限和相对门限相结合的软切换触发和判决算法。通过仿真...切换是移动网络最重要的技术之一,直接影响着通信系统的整体性能。研究了IEEE 802.16e系统基于CINR(Carrier to Interference+Noise Ratio,载波干扰噪声比)的软切换机制,提出绝对门限和相对门限相结合的软切换触发和判决算法。通过仿真研究了各参数对平均切换次数、切换损耗概率和网络资源利用率的影响,并在这些系统性能之间寻求折中。展开更多
IEEE 802.16e, as an amendment and corrigendum to the IEEE 802.16-2004, published on 28 February 2006, and intended to update and expand IEEE 802.16-2004 to allow for mobile subscriber stations. This paper summarizes t...IEEE 802.16e, as an amendment and corrigendum to the IEEE 802.16-2004, published on 28 February 2006, and intended to update and expand IEEE 802.16-2004 to allow for mobile subscriber stations. This paper summarizes the key management protocol belonging to security part of the IEEE 802.16e, which includes security negotiation, authorization, key derivation, handshake, and key transportation. While these building blocks are well designed, we point out some unwelcome features for these building blocks. We also give out suggestions to diminish the proposed problems.展开更多
A novel method for analysing the performance of power saving class of Type Ⅲ in IEEE 802.16e is proposed,which is applicable to design,maintenance and management for mobile wireless metropolitan area network.Consider...A novel method for analysing the performance of power saving class of Type Ⅲ in IEEE 802.16e is proposed,which is applicable to design,maintenance and management for mobile wireless metropolitan area network.Considering the memoryless nature of user initiated packet arrival,a Geom/G/1 queue model with multiple vacations and setup period is built to capture the principle for the power saving class of Type Ⅲ.By using an embedded Markov chain method and the boundary state variable theory,we obtain the queueing measures such as queueing length,waiting time and busy cycle in steady state.Correspondingly,we derive explicitly the performance measures for the power saving class of Type Ⅲ in terms of handover ratio,energy saving ratio,and average packet response time.Based on numerical results,we develop a cost function to determine numerically the optimal length of sleep window and the minimal cost with different offered loads.展开更多
文摘切换是移动网络最重要的技术之一,直接影响着通信系统的整体性能。研究了IEEE 802.16e系统基于CINR(Carrier to Interference+Noise Ratio,载波干扰噪声比)的软切换机制,提出绝对门限和相对门限相结合的软切换触发和判决算法。通过仿真研究了各参数对平均切换次数、切换损耗概率和网络资源利用率的影响,并在这些系统性能之间寻求折中。
基金Supported by the National Natural Science Foundation of China (60473027)
文摘IEEE 802.16e, as an amendment and corrigendum to the IEEE 802.16-2004, published on 28 February 2006, and intended to update and expand IEEE 802.16-2004 to allow for mobile subscriber stations. This paper summarizes the key management protocol belonging to security part of the IEEE 802.16e, which includes security negotiation, authorization, key derivation, handshake, and key transportation. While these building blocks are well designed, we point out some unwelcome features for these building blocks. We also give out suggestions to diminish the proposed problems.
基金Supported by the National Natural Science Foundation of China (No.10671170,60773100)the Natural Science Foundation of Hebei Province,China (No.2009000475)
文摘A novel method for analysing the performance of power saving class of Type Ⅲ in IEEE 802.16e is proposed,which is applicable to design,maintenance and management for mobile wireless metropolitan area network.Considering the memoryless nature of user initiated packet arrival,a Geom/G/1 queue model with multiple vacations and setup period is built to capture the principle for the power saving class of Type Ⅲ.By using an embedded Markov chain method and the boundary state variable theory,we obtain the queueing measures such as queueing length,waiting time and busy cycle in steady state.Correspondingly,we derive explicitly the performance measures for the power saving class of Type Ⅲ in terms of handover ratio,energy saving ratio,and average packet response time.Based on numerical results,we develop a cost function to determine numerically the optimal length of sleep window and the minimal cost with different offered loads.
