Enhanced QoS for Real-time Multimedia Delivery over the Wireless Link using RFID Technology

Abstract

Currently, there is an increasing demand for real-time multimedia applications running over the Internet. In a wired network, if congestion occurs, the quality of real-time multimedia transmission degrades severely. Rate-based adaptation schemes are being used to alleviate congestion. Packet loss incurred is used as the main indicator of network congestion. However, when running multimedia applications over wireless/mobile networks, packet loss can be attributed to different causes other than congestion. Packet loss can be due to the low bandwidth of the wireless link or the frequent interruptions in service due to mobility, handoff, or signal propagation effects, e.g. obstruction, attenuation. In this paper, we present the design of our sensor guided wireless adaptation scheme (SGWAS) that works in a micromobility domain and that infers the main reason of packet loss incurred by the mobile node in the cell. Consequently, it takes the appropriate action to improve the QoS of the transmission. Determining the reason of packet loss relies on information obtained from wireless sensors, specifically RFlD devices, to detect the location of the mobile node within the cell. On one hand, if packet loss is due to the low bandwidth of the wireless link, which can cause local wireless link congestion, then local transmission rate adaptation is applied in the cell. On the other hand, if packet loss is due to mobility or signal propagation effects, then other appropriate actions are taken. We conducted some simulation experiments to verify that we can determine the location of the mobile node when it is in the handoff region. The results demonstrate that SGWAS identifies the reason of packet loss when the mobile node is in the handoff region. Rate adaptation should not be performed in this case because packet loss is not due to congestion