Energy Aware OLSR-Based Mobile Ad Hoc Networks

OLSR is a well-known proactive routing protocol designed for mobile ad hoc networks (MANETs). OLSR adopts a concept of an MPR mechanism where only mobile nodes selected as MPR nodes can retransmit broadcast packets received from other mobile nodes. Although OLSR reduces the number of broadcast packets, MPR nodes consume more energy than other mobile nodes. Since mobile nodes in MANETs are powered by battery with limited energy, energy efficiency is a critical issue in designing a routing protocol that affects the overall network performance. This paper proposes a residual energy-based OLSR protocol named RE-OLSR. The RE-OLSR takes residual energy level of each node into account to select MPR nodes. The RE-OLSR also considers the reachability and the degree of one-hop neighbor nodes. The aim of RE-OLSR is to avoid selecting mobile nodes with small residual energy as MPR nodes and concentrating energy consumption in specific nodes. The performance of RE-OLSR is evaluated through simulation experiments. The results show that the proposed scheme improves energy efficiency and enhances network throughput efficiently

Energy Aware OLSR-Based Mobile Ad Hoc Networks

OLSR is a well-known proactive routing protocol designed for mobile ad hoc networks (MANETs). OLSR adopts a concept of an MPR mechanism where only mobile nodes selected as MPR nodes can retransmit broadcast packets received from other mobile nodes. Although OLSR reduces the number of broadcast packets, MPR nodes consume more energy than other mobile nodes. Since mobile nodes in MANETs are powered by battery with limited energy, energy efficiency is a critical issue in designing a routing protocol that affects the overall network performance. This paper proposes a residual energy-based OLSR protocol named RE-OLSR. The RE-OLSR takes residual energy level of each node into account to select MPR nodes. The RE-OLSR also considers the reachability and the degree of one-hop neighbor nodes. The aim of RE-OLSR is to avoid selecting mobile nodes with small residual energy as MPR nodes and concentrating energy consumption in specific nodes. The performance of RE-OLSR is evaluated through simulation experiments. The results show that the proposed scheme improves energy efficiency and enhances network throughput efficiently

Identifying Design Requirements for Wireless Routing Link Metrics

In this paper, we identify and analyze the requirements to design a new routing link metric for wireless multihop networks. Considering these requirements, when a link metric is proposed, then both the design and implementation of the link metric with a routing protocol become easy. Secondly, the underlying network issues can easily be tackled. Thirdly, an appreciable performance of the network is guaranteed. Along with the existing implementation of three link metrics Expected Transmission Count (ETX), Minimum Delay (MD), and Minimum Loss (ML), we implement inverse ETX; invETX with Optimized Link State Routing (OLSR) using NS-2.34. The simulation results show that how the computational burden of a metric degrades the performance of the respective protocol and how a metric has to trade-off between different performance parameters

A comparative study of energy efficient routing strategies based on OLSR

Energy efficiency is a key issue in wireless ad hoc and sensor networks. In order to maximize network lifetime, several directions have been explored, among them energy efficient routing. In this report, we show how to extend the standardized OLSR routing protocol, in order to make it energy efficient. To take into account residual node energy, the native selection of multipoint relays of OLSR is changed. Three selection algorithms based on the minimum residual energy are evaluated and the best one is chosen. The OLSR extension we propose, selects the path minimizing the energy consumed in the end-to-end transmission of a flow packet and avoids nodes with low residual energy. As it has been shown that two-path routing is energy efficient, we compare this extension with a two-path source routing strategy (with different links or different nodes). An extensive performance evaluation allows us to conclude that our proposal maximizes both network lifetime and the amount of data delivered