Experimental performance analysis of routing metrics in Wireless Mesh Networks

Abstract

This paper provides a description of a wireless mesh network testbed setup and a measurement-based performance evaluation of the Optimized Link State Routing (OLSR) protocol [7] under three different routing metrics. The considered metrics include hop-count, ETX and ETT. The network performances are evaluated in an indoor testbed formed by heterogeneous MIMO devices. A part of our tests was about the impact of 802.11n features on the network performances showing the importance of lower layers consideration. Our measurements point out the shortcoming of each metric and eventual optimizations towards a more efficient routing. Experimental results show that OLSR-ETT outperforms OLSR-ETX and OLSR-hopcount significantly in terms of packet loss, end-to-end delay, and efficiency.

Inter-flow and intra-flow interference mitigation routing in wireless mesh networks

“…Some other proposals only treat the intraflow or the interflow interferences but not both at the same time. We have made, in a previous work [12] , an experimental performance study of some of the proposed metrics and based on the results found we propose, in this work, new routing metrics specifically designed for wireless mesh networks.…”

“…Moreover, there are few proposals which address the problem of both intra-flow and inter-flow interference at once. We conducted, in a previous work [11,12] , an experimental performance study of some of the existing metrics and based on its results we propose, in this work, a new routing metric specifically designed for wireless mesh networks. This metric aims to accurately measure the available capacity of a link when taking into account both the current use of the link and possible interferences with neighboring links.…”

Experimental Evaluation of BMX6 Routing Metrics in a 802.11an Wireless-Community Mesh Network

“…Moreover, to our best knowledge, this is the first empirical evaluation of a real IEEE 802.11n-based community network. Other empirical works use controlled scenarios [5] to compare routing metrics (like ETX [6] and ETT [7] metrics). Finally, some other works use off-line evaluation of available data to estimate various network properties [8], including routing performance [9] but can not really be compared to on-field experimentation.…”

“…Note that SPF correspond to hopcount metric. All capacities shown in this section are computed using the corrected equation (5). The best path to the gateway has been computed using an algorithm not provided here, for the sake of space.…”

Towards an optimised traffic-aware routing in wireless mesh networks

“…This metric allows a fast recovery of instable routes due to link breakage or node mobility. In our experiments (Houaidia et al, 2013a), we intend to evaluate and compare the performances of OLSR under Hop-Count as simplistic metric and two routing metrics aware of the link quality which are ETX and ETT. It does not consider the trade-off between distances (loss) and hops (Houaidia et al, 2013b).…”