Energy Conservation Strategy for M2M Differentiated Services in 5G/HetNet

Machine to Machine (M2M) or Machine Type Communication (MTC) is one of the emerging 5G technologies and represents a key component of Internet of Thing (IoT). The significant increase in the number of these devices could, however, lead to a huge amount of traffic at the access network, which may cause heavy congestion and service degradation, especially for the most critical applications. Indeed, when the M2M traffic's arrivals become correlated and synchronous, the performance of the Random Access Channel (RACH) is drastically reduced, causing a large number of devices to experience outages due to repetitive failed access attempts. This results in increased power consumption and intolerable access delays. In this paper, we propose a novel approach to deal with massive access attempts, for both M2M delay sensitive applications and delay tolerant ones. Our idea is consisting of reducing simultaneously the number of access attempts and the access latency for delay sensitive applications, which allows guaranteeing energy conservation. Numerical results show that the proposed approach is able to increase the access success probability and reduce access delay especially for delay-sensitives devices as well as satisfying the energy conservation.