Abstract
It is challenging to support multimedia transmissions over wireless networks, especially, wireless mesh networks, due to some natural resource constraints of wireless networks. In this paper, we investigate in detail some possible improvements on a number of layers to enable the multimedia transmission over wireless networks with QoS support. We implement all our protocols in some test-beds to study their real time performances. We first study a number of improvements of some existing routing protocols to support multimedia transmissions. Some new admission control and rate control mechanisms are studied and their performance gains are verified in our experiments. In our new cross-layer adaptive rate control (CLARC) mechanism, we adaptively change the video encoder’s output bit rate based on the available network bandwidth to improve the quality of the received video. We design and implement a campus test-bed for supporting multimedia traffics in mobile wireless mesh networks. We also design a mobile gateway protocol to connect the MANET to Internet and a wireless LAN management protocol to automatically manage WLAN to provide some QoS.
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