An improved DQ access protocol for cellular-based massive M2M communications

This paper proposes an improved multiple access protocol based on the Distributed Queue (DQ) mechanism for cellular-based massive Machine-to-Machine (M2M) communications. The key concept of our protocol is to initially employ a subsets division step before starting the DQ mechanism. To validate the effectiveness of the proposal, we evaluate the performance of the proposed protocol over present Long-Term Evolution (LTE) networks with ultra-dense scenarios. Simulation results confirm that in the low load region, the proposed scheme offers comparable performance to the conventional DQ-based protocol and outperforms the standard Access Class Barring (ACB) scheme. In dense scenarios with high traffic, however, the proposed protocol outperforms both conventional DQ and the ACB in terms of delay.