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In this paper, orienting to clustered industrial wireless sensor networks, the authors analyze the performance bounds of the converge-cast scheduling, which is a typical many-to-one communication in wireless industrial networks. The analysis aims to the cluster-line and cluster-tree topologies. Each kind is future divided into three scenarios according to an application parameter, named data update rate. Firstly, they establish the lower bounds on the number of timeslots to finish the intracluster and the intercluster converge-cast transmissions. Secondly, they establish the lower bounds on the number of channels based on the lower bounds on the number of timeslots and maximum available channels in a multichannel scenario. Lastly, they carry out the extensive analysis-taking packet retransmissions into consideration so as to meet the reliability requirement.
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