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Wireless Sensor Network (WSN) is widely used in Emergency Management System (EMS) to assure requirement of safety in current society. For centralized management, it is difficult for conventional systems to assure the real-time transmission of emergency information under rapidly changing situations. Thus, based on the Autonomous Decentralized Community (ADC) concept the main route for emergency information...
Today's Internet is a massive, distributed network which continues to grow in size as globalization takes major role in everyone's life. The problem is complicated by the fact that one cannot rely on the cooperation of individual servers and routers to aid in the collection of network traffic measurements vital for these tasks. Packet Forwarding Priority can have a significant impact on the performance...
The Session Initiation Protocol (SIP) has gained momentum and is being widely used both in the Internet and Next Generation Telecommunications network as the core signaling protocol. SIP operation relies on SIP servers which are responsible for forwarding of SIP messages. It has been shown that the performance of SIP servers is largely degraded during overload conditions due to the built in message...
Energy utilization is a challenging task that is being encountered in low-powered Wireless Sensor Networks (WSNs) when designing an algorithm, protocol or hardware. Congestion is a factor that can affect a network's lifetime (and energy utilization), since it usually leads to packet drops or collisions in the medium followed by possible retransmissions. Forwarding data packets through alternative...
InfiniBand networks are aimed to fulfill increasing communication demand of parallel applications in high performance clusters. However, the dynamic behavior of communication load may cause bottlenecked link(s) which lead to message congestion. Congestion spreading increases latency and reduces network throughput causing important performance degradation. In this paper, we propose a congestion control...
In this paper, a group policy based automatic control architecture is presented for the management of virtual private network (VPN). This network architecture splits the management view into parallel hierarchies. The architecture builds its security policy on resource groups. By utilizing a centralized policy server, the procedures for policy translating, distributing and monitoring are automatically...
In this paper, we propose a novel TCP congestion control algorithm, named TCP SPC, which improves upon the performance of TCP Reno in wireless networks. TCP SPC exploits statistic process control (SPC) methods that have been used effectively in a variety of monitoring and control applications other than TCP. A TCP SPC sender uses RTT statistics to judge the network status, whereby the congestion window...
The acknowledgment strategy has great potential to increase the TCP throughput when it runs over 802.11 MAC protocol. In particular, TCP acknowledgments carry out an extensive number of medium accesses as they compete in the same route as data packets for media. As the load increases, the well-known hidden terminal effects caused by interference between ACK and data packets in MAC layer can degrade...
Congestion in wireless sensor networks (WSNs) is an important issue. In this paper, a new method is presented to overcome congestion causes. Actually this is a hop-by-hop rate control approach. In our method, queue length of the nodes is monitored continuously. Then, based on a fuzzy inference system, admissible rate for upstream nodes is calculated based upon sensor nodes constraints. This method...
Sleep-based topology control is an important technique used in wireless sensor networks (WSNs) to reduce the energy consumption of the individual node platforms and, as a consequence, sleep-based topology control is useful to increase the functional lifetime of the networks. While in the literature there are several schemes that address sleep-based topology control in WSNs, there is no proposal that...
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