With the development of heterogeneous networks and video coding standards, multiresolution video applications over networks become important. It is critical to ensure the service quality of the network for time-sensitive video services. Worldwide Interoperability for Microwave Access (WIMAX) is a good candidate for delivering video signals because through WIMAX the delivery quality based on the quality-of-service (QoS) setting can be guaranteed. The selection of suitable QoS parameters is, however, not trivial for service users. Instead, what a video service user really concerns with is the video quality of presentation (QoP) which includes the video resolution, the fidelity, and the frame rate. In this paper, we present a quality control mechanism in multiresolution video coding structures over WIMAX networks and also investigate the relationship between QoP and QoS in end-to-end connections. Consequently, the video presentation quality can be simply mapped to the network requirements by a mapping table, and then the end-to-end QoS is achieved. We performed experiments with multiresolution MPEG coding over WIMAX networks. In addition to the QoP parameters, the video characteristics, such as, the picture activity and the video mobility, also affect the QoS significantly. 1. Introduction With the development of heterogeneous networks, multiresolution video coding becomes desirable in various applications. It is important to provide a flexible scalable framework for multiresolution video services, where video resolution, quality, and network quality-of-service (QoS) parameters are determined according to the requirements of user equipment and network resources [1–4]. Worldwide Interoperability for Microwave Access (WIMAX) communication is suitable for supporting video delivery because it guarantees the service quality. The network control reserves adequate resources in the network to support video delivery based on QoS parameters, which, in general, includes the peak rate, the mean rate, the mean burst length, the delay, the jitter, the cell loss rate, and so forth [5–7]. A negotiation process may be involved in QoS parameter determination for efficient network resource utilization. As long as the video application requests a suitable set of QoS parameters, the network should be able to deliver the video signals with guaranteed quality [8]. A user could specify a set of QoS parameters satisfying the requirements of video quality before executing an application. The selection of suitable QoS parameters is, however, not trivia for video service users. The
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