TAILIEUCHUNG - Báo cáo hóa học: " Research Article Effects of Unstable Links on AODV Performance in Real Testbeds"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Effects of Unstable Links on AODV Performance in Real Testbeds | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 19375 14 pages doi 2007 19375 Research Article Effects of Unstable Links on AODV Performance in Real Testbeds Eleonora Borgia and Franca Delmastro Pervasive Computing and Networking Laboratory PerLab Inistitute for Informatics and Telematics IIT National Research Council CNR Via G. Moruzzi 56124 Pisa Italy Received 14 July 2006 Revised 24 October 2006 Accepted 30 January 2007 Recommended by Marco Conti A link between a pair of nodes is defined unstable if it is characterized by a packet loss which is not negligible in one or both directions. The presence of unstable links in multihop ad hoc networks is very likely and it depends on several factors . different transmission capabilities of the devices interferences caused by additional wireless devices . Their management by the routing protocols is of paramount importance since they negatively affect applications performance. In our previous experimental studies we found that AODV is characterized by very low performance in some specific situations and in this work we demonstrate that it mainly depends on the wrong management of unstable links as valid routes. We present some policies that have been proposed in literature to avoid this problem and we validate two of them through experimental results exploiting also a direct comparison with the proactive routing protocol OLSR. Our results show that AODV is not able to avoid the use of unstable links even when an alternative stable route exists. In the same conditions OLSR outperforms AODV by correctly managing unstable links. In fact it is able to guarantee a higher packet delivery ratio to the application by using the most stable path to reach the destination. Copyright 2007 E. Borgia and F. Delmastro. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and .

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