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In recent years, integrated applications with multimedia devices and wireless sensor networks promoted the evolution of wireless sensor networks, namely Wireless Multimedia Sensor Networks (WMSNs). The applications in WMSNs have to focus on both energy saving and application-level Quality of Service (QoS). To overcome this challenge, in this paper, the authors proposed a new kind of pattern named Temporal Region Requesting Pattern (TRRP) and a novel algorithm named TRRP-Mine for mining TRRPs efficiently. They also designed a temporal region requesting cost function of cache replacement, abbreviated as TRRC, for the cooperative caching multimedia content in WMSNs. Empirical evaluations under various simulation conditions showed that the proposed method delivers excellent performance in terms of hit rate and the number of replacements.
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