Supporting QoS in multimedia over 802.11e wireless network with adaptive framework

Abstract

The use of multimedia applications is increasing every year. These trends include the deployment using wireless local area network (WLAN) that allows users to access various services. The most significant thing in the use of wireless networks is the delay, collusion, attenuation and interference. In addition, it is difficult to provide quality of service (QoS) in WLAN as the network capacity also varies with the offered load [1]. There are several problems in QoS support for multimedia applications. For real-time multimedia applications, packet loss and packet drop due to excessive time delay is a major factor affecting the quality perceived by the user. For video streams, delay is a very important factor to consider when transmitting the entire video frame from the sender to the client. Level of losses incurred due to packet delay depends on the delay data transmitted in the form of a video stream. Video streaming applications usually impose an upper limit (threshold) packet loss. In particular, packet loss ratio required to be kept below the threshold for achieving an acceptable visual quality. Packet loss ratio is high due to network congestion or network traffic is very high (overload) that cause degradation of the quality of multimedia, especially in wireless networks with limited bandwidth. To reduce the rate of degradation is the necessary framework of adaptive mechanisms in the wireless network so that video streaming applications such as teleconferencing can work well.