Anticipation of ETX Metric to manage Mobility in Ad Hoc Wireless Networks

International audienceWhen a node is moving in a wireless network, the routing metrics associated to its wireless links may reflect link quality degrada- tions and help the routing process to adapt its routes. Unfortunately, an important delay between the metric estimation and its inclusion in the routing process makes this approach inefficient. In this paper, we intro- duce an algorithm that predicts metric values a few seconds in advance, in order to compensate the delay involved by the link quality measurement and their dissemination by the routing protocol. We consider classical metrics, in particular ETX (Expected Transmission Count) and ETT (Expected Transmission Time), but we combine their computations to our prediction algorithm. Extensive simulations show the route enhance- ment as the Packet Delivery Ratio (PDR) is close to 1 in presence of mobility

Metric Anticipation in Mobile Ad-Hoc Networks

International audienceIn this paper, we propose a new method for metric calculations. It aims to improve mobility management in wireless networks. The idea consists in anticipating metric values in order to compensate the delay generated by the measure of the link quality and the routing protocols. As an example, we consider the popular ETX (Expected Transmission Count) metric. We focus on ad-hoc networks, even if our approach could be used in other contexts. We show by simulations that our approach, when well parametrized, allows a Packet Delivery Ratio (PDR) close to 100% when nodes are moving

Mobility management in ad hoc networks using routing metrics

International audienceIn wireless mobile ad hoc networks, routing protocols use metrics to select the best routes. Metrics may reflect the quality of the wireless link and help to manage mobility. But, there is a delay between link quality measurements performed by the routing protocol and their instantaneous values. To compensate this delay, the idea is to anticipate the value of the metric a few seconds in advance. The purpose of this paper is to propose a new technique to compute ETX metric, that is sensitive to mobility and which optimizes throughput at the same time. We show through simulations performed with NS-3 (Network Simulator version 3) that our approach leads to Packet Delivery Ratio (PDR) close to 1 in presence of mobility

Metric Anticipation in Mobile Ad-Hoc Networks

International audienceIn this paper, we propose a new method for metric calculations. It aims to improve mobility management in wireless networks. The idea consists in anticipating metric values in order to compensate the delay generated by the measure of the link quality and the routing protocols. As an example, we consider the popular ETX (Expected Transmission Count) metric. We focus on ad-hoc networks, even if our approach could be used in other contexts. We show by simulations that our approach, when well parametrized, allows a Packet Delivery Ratio (PDR) close to 100% when nodes are moving