Estimating maximum and minimum delays for wireless discrete networked control systems
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The automation architecture consists of actuators, sensors, programmable logic controllers (PLC) and monitoring systems. Some research focuses on how to replace the communication between those entities from wired to wireless communication taking in consideration the industrial constraints, given the advantages of this kind of communication. To study the performance of the wireless network system, this paper presents an approach for estimating the maximum and minimum delays for each traffic of a wireless network in the worst case. Influence of the maximum number of retransmission parameter is studied on the estimated delay and on the packet loss rate. Our results are compared and analyzed with simulated ones obtained with the tool OPNET.Keywords:
Retransmission
Packet loss
This letter proposes a new receiver-based retransmission scheme for efficient retransmission with TFRC. The proposed scheme consists of an adaptive packet loss (APL) detection method and a receiver-based retransmission mechanism that efficiently accomplishes retransmission. Simulation results show that the proposed scheme not only improves effective retransmission but also reduces unnecessary retransmissions.
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If the packet loss rate in a network is higher than the loss rate requested by an application, the transport protocol must make up for the difference in loss rate. In high bandwidth delay-product networks the latency introduced by retransmission-based error recovery schemes may be too high for applications with latency constraints. In this case, Forward Error Correction (FEC) can be used. FEC allows recovery from loss without retransmission. The amount of loss recovered strongly depends on the loss behavior of the network. FEC works best if losses are dispersed in time.
Retransmission
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Packet loss
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Retransmission
Packet loss
Transport layer
End-to-end delay
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Packet segmentation
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Retransmission
Packet loss
End-to-end delay
Transport layer
Packet segmentation
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In order to improve the efficiency of the lst packets retransmission in wireless network,this paper presents a retransmission method with exclusive or network coding for the scence of one sending node and multiple receiving nodes.We use an optimization coding strategies to constitute the lost packages.Now,a retransmission can realize the effect which equal the traditional method of retransmission for a lot of times.Theoretical analysis and simulation experiments show that the method can reduce the retransmission number effectively,simple and feasible to realize.
Retransmission
Linear network coding
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It is widely accepted that retransmitting bursts in Optical Burst Switching networks improves the throughput at higher layers. Since the data is transported in large bursts and there are burst losses due to contention, indiscriminate retransmission can defeat the purpose of burst-level retransmissions. For many applications, retransmission after a certain time would be of no use and it may not be necessary to retransmit all the lost packets. We propose a framework for retransmission with parameters to control the retransmission rate and thus the increase in the network load. We propose a network model for controlled retransmission and a modified functional architecture of the ingress node. The existing work lacks an accurate analysis to estimate the impact of retransmissions on the network load while studying the improvement in the end-to-end packet recovery. We provide theoretical analysis to evaluate the load at each node due to both fresh and retransmitted bursts. We propose some metrics to quantify the benefit of retransmission and the impact of the retransmission parameters proposed on the network performance. We show that with controlled retransmission, the buffer requirement at the ingress node is proportional to the steady-state rate of retransmitted bursts. We validate the analytical model arid also study the impact of retransmission on the network performance with extensive simulations.
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The selective retransmission technology is a research hotspot in error control methods for video communications.Four aspects of the technology are discussed,including the location of retransmission decision,the retransmission contents classification,the impact of network states on the retransmission,the transport protocols supporting selective retransmission.Then,three error resilient systems using selective retransmission are described.Based on the hybrid automatic repeat request technology,a hybrid automatic selective repeat request scheme is presented for video transmission.The scheme can flexibly adjust the proportion of the check data and the retransmission data to the whole transmission data,which may lead to a better tradeoff between the redundancy cost and the retransmission delay.In addition,the main research directions of the selective retransmission in video communications are pointed out,including video content classification,the criteria and timing for selective retransmission,and selective retransmission schemes with low complexity,easy implementation for practical video communications.
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Retransmission
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In this paper, we address retransmission strategies of the generation-based network coding in the packet network. Our discussion focuses on how to make the retransmission more efficient. We investigate four retransmission strategies, quasi Classical ReTransmission strategy (CRT), Random ReTransmission strategy (RRT), Packet-Loss-Edge-based ReTransmission strategy (PLERT) and Minimum ReTransmission strategy (MRT). The PLERT strategy and the MRT strategies are the main contributions of this paper.
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Since retransmission-based error control for real-time communication will be feasible in the future high speed network environment, we have proposed R/sup 3/TP (retransmission based reliable real-time data transfer protocol). R/sup 3/TP is a transport layer protocol which provides high quality real-time data transfer by adopting ATM block transfer (ABT) and retransmission-based error control. A fast and accurate packet loss detection scheme is indispensable for retransmission based error control in real-time communication. A novel packet loss detection scheme for R/sup 3/TP and its evaluation results in comparison with other loss detection schemes are described.
Retransmission
Packet loss
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