Improving wireless quality of service by using different strategies and scheduler

Wireless network gradually develops based on wired network. It overcomes some defects which wired networks need layout, its line do easily damage and stations can´t move and it is difficulty to be connected with long-distance stations and so on. But, wireless links can exhibit high error rates due to attenuation,fading, or interfering active radiation sources. To make matter worse, error rates can be highly variable due to changes in the wireless environment. According to all categories of traffic, we present two error control schemes (i.e. ARQ and FEC) which are used to improve transport performance over the wireless link, and a mechanism (MPFQ scheduler) to provide Quality of Service. Finally, we propose a scheduler packet model for weighted fair queuing algorithm by adjusting flow weights in order to create outcome fairness