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The authors propose a systematic cross-layer joint scheduling and resource allocation algorithm to provide enhanced Quality of Service (QoS) for real-time video uplink of camera networks over WiMAX. Under the constraint of limited available OFDMA resource, how to fairly schedule all mobile Camera Stations (CSs) with varying channel quality and maintain system performance simultaneously is always a critical issue for practical QoS design of a WiMAX Base Station (BS). The proposed system uses video encoding rate adaptation in APPlication (APP) layer of CSs and effectively incorporates with the Medium Access Control (MAC) QoS mechanisms of the BSs, without the need of modifying existing 802.16 MAC/PHY standardized protocols, to greatly improve the spectrum efficiency of WiMAX.
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