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The performance of Wireless Sensor Networks (WSNs) is constrained by congestion, latency, data loss and other phenomena. In this paper, we propose a model based on the use of Mini-Sinks (MSs), each with considerable storage capacity, instead of a single sink for collecting the data. The idea is that one or more MS are mobile and move according to an arbitrary mobility model inside the sensor field to collect data within their coverage areas and forward it towards the sink. Energy Conserving Routing Protocol (ECRP), based on route diversity, is implemented in MSs and sensors in order to optimize the transmission cost of the forwarding scheme. A set of multiple paths between MSs and sensors is generated to reduce local congestion phenomena and to distribute the global traffic over the entire network. Since a topology incorporating MSs changes constantly due to their mobility, we analyze the impact of global connectivity for a given WSN. Simulations were performed in order to validate the performance of our model. We compare the results obtained with those for a single static sink, and show that our model gives better results in terms of lower congestion, energy consumption and broadcast latency.