Abstract
Problem statement: Wireless Mesh Networks (WMNs) is an emerging technology for wireless environment. Since WMNs are permanent or semi-permanent network, an efficient and reliable path establishment is the core concern for such type of networks. Several performance metrics has been designed for WMNs such as Expected Transmission Count (ETX), Expected Transmission Time (ETT), interference Aware Routing Metric (iAWARE), Link Type Aware (LTA) Metric, Success Probability Product (SPP) and so on. However, each of these individual routing metric considered some selected features thus a single metric is inad equate for selecting the most reliable path. Consequently, it is necessary to integrate multiple performance metrics into a routing protocol to att ain optimal performance. Approach: In this study we proposed a technique of integrati ng multiple metrics to improve the performance of a WMN routing protocol. This technique was implemented in Ad hoc On-Demand Distance Vector (AODV) routing protocol thus leading to the development of Integrated Metrics AODV (IM-AODV) routing protocol. Results: The simulation results indicated that IM- AODV protocol significantly outperformed the tradit ional AODV in WMNs environment. In a lightly loaded network the performance of IM-AODV is almost similar to AODV, however, in moderate to highly loaded network the performance of IM-AODV was improved by 10% (on average) compared to AODV. Conclusion/Recommendations: Incorporating multiple metrics in a routing protoc ol proved an effective mechanism for selecting the best path in a multi-hop wireless network (e.g. WMN) with loop free routing and avoiding highly loaded and lo ssy links. The proposed integrated metric scheme can also be considered for other routing protocols with simple modifications.
Highlights
These days, majority of the Internet accesses or connections are carried over wire line infrastructure employing DSL, T1 or cable-modem based connection
Packet delivery ratio: The fraction of packets sent by the application that are received by the receivers[24]
Since integrated metrics mechanisms assist to avoid congestion and increase network resource utilization, IM-Ad hoc On-Demand Distance Vector (AODV) performed significantly better than AODV when traffic load is higher
Summary
These days, majority of the Internet accesses or connections are carried over wire line infrastructure employing DSL, T1 or cable-modem based connection. Douglas et al.[18] explores the details of the performance of minimum hop count routing on a wireless test-bed and found that minimum hop count often finds route with significantly less throughput than the best available They proposed a high-throughput path metric for multi-hop wireless networks known as expected transmission count (ETX) metric. This is one of the first metrics that explicitly accounts for link quality during path selection. Four performance metrics are considered such as Expected Transmission Count (ETX), Round Trip Tome (RTT) and Life Time (LT)[23] and traditional Hop Count , which grantees a minimum hop count with loop free routing and avoided highly loaded and lossy links
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