Communication Engineering

1307 Words3 Pages

Reliability Evaluation of Communication Network Considering Capacity and Delay of Transmission Abstract This paper introduces a reliability index Capacity and Delay Related Reliability (CDRR) for communication networks. An algorithm is proposed for evaluating the CDRR. This algorithm needs the binary system states generated by the minimal paths, message flow capacity and time delay of these states. A criterion for computing the delay time of the binary system states is also proposed. In the paper, attempt has been made to justify that the index, CDRR will be an appropriate reliability index for evaluating the performance of communication networks. Keywords—Connectivity Performance-index CDRR Communication-network Flow-capacity Time-delay I. INTRODUCTION Communication network is an example of flow networks where the flow is the message transported through the network consisting of nodes acting as switching stations and edges as communication links. Disruption of the communication network depends upon the link failure as well as the non-fulfillment of constraints of performance by the system. There are several performance indexes of flow networks already defined [1-5]. Most of these consider the effect of link capacity only in evaluating the performance index. This index has been described in literature as Capacity Related Reliability (CRR). In performance evaluation of communication networks transportation of links has also been considered [6-9]. But the operating environment of communication networks is such that the performance of the network is affected by the constraints of both capacity and transportation time. There is a need of integrating both these in reliability index. Here one such reliability is being propo... ... middle of paper ... .... 37, pp. 65–69,Apr. 1988. [8] R. Schanzer, "Comment on: reliability modeling and performance of variable link-capacity networks," IEEE Trans. Rel., vol. 44, pp. 620–621, Dec. 1995. [9] K. Kyandoghere, "A note on: reliability modeling & performance of variable link capacity networks," IEEE Trans. Rel., vol. 47, pp. 44–48, Mar. 1998. [10] Rajiv Kumar, Krishna Gopal and G. L. Pahuja, "A discussion on the method used for capacity calculation in finding the performance index of flow networks" pp.544 - 547 Proceedings of National Conference SECTAS- 2002, DEI Dayalbag Agra [11] S. M. Lee, C. H.Lee and D. H. Park, "Sequential capacity determination of subnetworks I network performance analysis," IEEE Trans. Rel., vol.53, pp. 481– 486.December 2004 [12] J. A. Abraham, "An improved algorithm for network reliability" IEEE Trans. Rel., vol.28, pp.58-61, April 1979.

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