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Control systems using sensors and wireless networks are becoming more prevalent, due to its ease of deployment: no wires and longer battery life. However, network delays and packet losses can degrade control system performance, which leads us to find the optimal network configuration to minimize that impact. Another main difficulty of having wireless networks for control systems is caused by interference...
Due to asynchronous packet transmissions and rate mismatch among different coding flows in existing opportunistic network coding architectures, such as COPE, the amount of packets which can be coded together may be insufficient and thus the performance gain of network coding cannot be fully exploited. One feasible solution for this problem is to make coding nodepurposely delay some packet transmissions...
Wireless Sensor Networks (WSN) based on the IEEE 802.15.4 standard are constantly expanding. Applications like production control, building control are more and more based on WSN because of their energy efficiency, self-organizing capacity and protocol flexibility. The IEEE 802.15.4 standard defines 3 network topologies: the mesh topology, the star topology and the Cluster-Tree topology. However,...
Quality of Information (QoI) provides a context-dependent measure of the utility that a network delivers to its users by incorporating non-traditional information attributes. Quickly and easily predicting performance and limitations of a network using QoI metrics is a valuable tool for network design. Even more useful is an understanding of how network components like topology, bandwidth, protocols,...
Consider the problem of exchanging information in a wireless network with random transmission delays. While the broadcast nature of the wireless medium presents many challenges, it also affords novel coding opportunities when exchanging information. However, straightforward network coding schemes do not perform well under random delay. In this paper, we rigorously define Real Time (RT) coding and...
In this paper, we analyze the impact of large, persistently-full buffers (‘bufferbloat’) on various network dynamics in IEEE 802.11n wireless networks. Bufferbloat has mostly been studied in the context of wired networks. We study the impact of bufferbloat on a variety of wireless network topologies, including wireless LAN (WLAN) and multi-hop wireless networks. Our results show that a single FTP...
Some research indicates that the TCP congestion control mechanism may cause the burstiness of traffic flow. A group of TCP segments are delivered simultaneously, while an acknowledgement (ACK) of a retransmission is successfully received. This burstiness leads to a network with high level contention, which extremely increases the probability of packet loss on wireless networks. TCP pacing is one of...
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