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Body sensor network (BSN) is a wireless network of implantable and/or wearable smart sensors. They can be deployed in medical applications, such as patients monitoring inside or outside hospital environment, as well as in high performance professional sports and other non human related applications. The size of a sensor node and its power consumption are major challenges in the design of implantable BSNs. The focus of this paper is to propose the definition of a new light weight communications protocol for the BSNs applications using very small sensor nodes supporting ultra low energy consumption.