Recent advances in wireless sensor networks have led to rapid development of real-time applications.Many routing protocols have been specifically designed for these applications where real-time guarantee is an essential design issue.In this paper,the state of the art in real-time routing protocols for WSNs is surveyed,along with the highlights of the advantages and performance issues of each routing protocol and algorithm.In addition,the paper concludes with classification of recent real-time routing protocols and discusses open research issues.
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