In real-time multimedia applications, the most problems are how to store, process, and transport the multimedia\ndata with cloud, how to optimize the cloud platform to satisfy the user demand, as well as how to provide the\nquality of service (QoS) guarantees by combining cloud platform and wireless sensor networks (WSNs). To overcome\nthese issues, the multimedia cloud was designed according to the characteristics of group of pictures (GOP), determining\ndegree, and video frame density. The opportunistic dynamic multimedia cloud platform was proposed on the basis of\nthe variation of packet error rate, decodable frame ratio and peak signal-to-noise ratio (PSNR) with channel quality. Then,\nthe optimal multi-relay hierarchical cooperative multimedia transmission scheme was designed and implemented by\nreconstructing the cooperative multimedia stream based on the framing of GOP. For enhancing the multimedia cloud\ncomputing efficiency and decreasing the complexity of encoding and decoding of multimedia stream, we combined\nthe opportunistic dynamic multimedia cloud platform and cooperative multimedia stream, which can also enhance the\nresources utilization of WSNs. Finally, the QoS guarantee protocol with the combination of opportunistic dynamic\nmultimedia cloud platform and cooperative multimedia stream for WSNs (ODM-CM-WSN) was presented. Especially,\nthe layered architectural model for multimedia applications and the opportunistic cooperative multimedia cloud service\nmodel were developed. The mathematical and simulation results demonstrate that the proposed QoS guarantee\nprotocol can satisfy the various requirements of multimedia applications and provide reliable and efficient cloud\nservices with WSNs.
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