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Evolution of technology has permitted to help dependent persons by implementing new systems to assist them at their homes. The majority of these systems are based on Wireless Sensor Networks (WSN) using 802.15.4 standard at the MAC level. In this paper, we propose a solution to permit a continuous assistance for dependent persons, called Domotic Assistance for Dependent Persons (DADP). We also propose a new MAC protocol to enhance QoS requirements, especially for alarm management in critical situations. Simulation results have shown that our proposed solution performs better than 802.15.4 in terms of reliability, energy consumption and loss ratio.