Resource location is the most important issue for Peer-to-Peer (P2P) system and flooding is the fundamental mechanism for unstructured P2P systems. Redundant messages will exponential growth with flooding scope increa...Resource location is the most important issue for Peer-to-Peer (P2P) system and flooding is the fundamental mechanism for unstructured P2P systems. Redundant messages will exponential growth with flooding scope increasing which severely influences the scalability of the system. In this paper, a new P2P model based on isolated broadcast domains is given to reduce the amount of redundant messages by limiting the radius of messages transmitted. Analysis and experiments show that this model can guarantee coverage of nodes and significantly reduce the amount of redundant messages generated.展开更多
In this paper, we present a detailed analytical study of previously proposed variable preamble length-based broadcasting scheme for wireless sensor networks (WSNs). Analytical results show that in dense wireless senso...In this paper, we present a detailed analytical study of previously proposed variable preamble length-based broadcasting scheme for wireless sensor networks (WSNs). Analytical results show that in dense wireless sensor networks, broadcasting a packet with a small size preamble can significantly improve the energy conservation on already limited battery powered sensor nodes. For fairer comparison with variable preamble length-based broadcasting scheme, a comprehensive analytical study for an existing probability-based broadcasting scheme is also presented. Analytically calculated results show that variable preamble length-based broadcasting scheme is more energy-efficient than the probability-based broadcasting scheme.展开更多
Broadcast is one of the most important approach in distributed memory parallel computers that is used to find a routing approach from one source to all nodes in the mesh. Broadcasting is a data communication task in w...Broadcast is one of the most important approach in distributed memory parallel computers that is used to find a routing approach from one source to all nodes in the mesh. Broadcasting is a data communication task in which corresponds to one-to-all communication. Routing schema is the approach used to determine the road that is used to send a message from a source node to destination nodes. In this paper, we propose an efficient algorithm for broadcasting on an all-port wormhole-routed 3D mesh with arbitrary size. Wormhole routing is a fundamental routing mechanism in modern parallel computers which is characterized with low communication latency. We show how to apply this approach to 3-D meshes. In wormhole, routing large network packets are broken into small pieces called FLITs (flow control digits). The destination address is kept in the first flit which is called the header flit and sets up the routing behavior for all subsequent flits associated with the packet. In this paper, we introduce an efficient algorithm, X-Hamiltonian Surface Broadcast (X-HSB) which uses broadcast communication facility with deadlock-free wormhole routing in general three dimensional networks. In this paper, the behaviors of this algorithm are compared to the previous results using simulation;our paradigm reduces broadcast latency and is simpler. The results presented in this paper indicate the advantage of our proposed algorithm.展开更多
在高铁线路故障情况下,为了支持高铁动车组在普速线路上运行,国铁集团组织研究了高铁动车组利用普速线迂回运行系统.该系统车地间无线通信拟采用的无线单向广播方案,在现有的列控系统中从未使用过,对其进行建模与验证研究具有重要意义....在高铁线路故障情况下,为了支持高铁动车组在普速线路上运行,国铁集团组织研究了高铁动车组利用普速线迂回运行系统.该系统车地间无线通信拟采用的无线单向广播方案,在现有的列控系统中从未使用过,对其进行建模与验证研究具有重要意义.通过分析CTCS-1级列控系统的总体技术规范,对无线广播通信场景进行详细设计和完善,采用SysML语言对场景建模,通过设计SysML-PRISM模型的转换规则将场景的SysML模型转换为概率模型,得到由信道模块、车站数据服务器(Station Data Server,SDS)模块、列车模块构成的无线广播通信场景概率模型,采用概率模型检验工具PRISM对场景的概率模型进行描述和验证.结果表明:场景设计合理、无线单向广播通信方式可行、SDS规定的优先发送报文的次数应该为2次或3次.本文中对无线广播通信场景的研究能提早发现系统技术方案中可能存在的问题,为相关研究提供参考.展开更多
文摘Resource location is the most important issue for Peer-to-Peer (P2P) system and flooding is the fundamental mechanism for unstructured P2P systems. Redundant messages will exponential growth with flooding scope increasing which severely influences the scalability of the system. In this paper, a new P2P model based on isolated broadcast domains is given to reduce the amount of redundant messages by limiting the radius of messages transmitted. Analysis and experiments show that this model can guarantee coverage of nodes and significantly reduce the amount of redundant messages generated.
文摘In this paper, we present a detailed analytical study of previously proposed variable preamble length-based broadcasting scheme for wireless sensor networks (WSNs). Analytical results show that in dense wireless sensor networks, broadcasting a packet with a small size preamble can significantly improve the energy conservation on already limited battery powered sensor nodes. For fairer comparison with variable preamble length-based broadcasting scheme, a comprehensive analytical study for an existing probability-based broadcasting scheme is also presented. Analytically calculated results show that variable preamble length-based broadcasting scheme is more energy-efficient than the probability-based broadcasting scheme.
文摘Broadcast is one of the most important approach in distributed memory parallel computers that is used to find a routing approach from one source to all nodes in the mesh. Broadcasting is a data communication task in which corresponds to one-to-all communication. Routing schema is the approach used to determine the road that is used to send a message from a source node to destination nodes. In this paper, we propose an efficient algorithm for broadcasting on an all-port wormhole-routed 3D mesh with arbitrary size. Wormhole routing is a fundamental routing mechanism in modern parallel computers which is characterized with low communication latency. We show how to apply this approach to 3-D meshes. In wormhole, routing large network packets are broken into small pieces called FLITs (flow control digits). The destination address is kept in the first flit which is called the header flit and sets up the routing behavior for all subsequent flits associated with the packet. In this paper, we introduce an efficient algorithm, X-Hamiltonian Surface Broadcast (X-HSB) which uses broadcast communication facility with deadlock-free wormhole routing in general three dimensional networks. In this paper, the behaviors of this algorithm are compared to the previous results using simulation;our paradigm reduces broadcast latency and is simpler. The results presented in this paper indicate the advantage of our proposed algorithm.
文摘在高铁线路故障情况下,为了支持高铁动车组在普速线路上运行,国铁集团组织研究了高铁动车组利用普速线迂回运行系统.该系统车地间无线通信拟采用的无线单向广播方案,在现有的列控系统中从未使用过,对其进行建模与验证研究具有重要意义.通过分析CTCS-1级列控系统的总体技术规范,对无线广播通信场景进行详细设计和完善,采用SysML语言对场景建模,通过设计SysML-PRISM模型的转换规则将场景的SysML模型转换为概率模型,得到由信道模块、车站数据服务器(Station Data Server,SDS)模块、列车模块构成的无线广播通信场景概率模型,采用概率模型检验工具PRISM对场景的概率模型进行描述和验证.结果表明:场景设计合理、无线单向广播通信方式可行、SDS规定的优先发送报文的次数应该为2次或3次.本文中对无线广播通信场景的研究能提早发现系统技术方案中可能存在的问题,为相关研究提供参考.
