Mobile Ad hoc Network: Issue and Challenges Related to QoS and Solutions

Mobile Ad Hoc Network (MANET) applications such as multimedia applications, audio/video conferencing, VOIP and webcasting need uninterrupted, stringent and inflexible Quality of Service (QoS). The provision of QoS guarantees in MANET is more challenging and difficult than wired network because of node mobility, lack of centralized control and a limited power supply. A lot of researches have been accomplished and also ongoing so far to offer QoS guarantees by designing QoS models and protocols. In the past some years, a number of QoS routing protocols for MANET with distinguish features have been designed. In this paper issues and challenges of QoS, overview of QoS routing metrics, and various performance metrics have been discussed.