Machine-to-machine (M2M) communication is considered as one of the key enablers for providing of advanced services and\napplications. SinceM2Mfeatures a massive number of user equipment (UE) pieces, one of the key issues is the radio access network\n(RAN) overload problem formassive connections inM2M communications. In order to improve the number of successful accesses\n(i.e., theM2MUEpieces that successfully transmit data packets) forM2Mcommunications in the current long termevolution (LTE)\nsystems, we propose a new hybrid protocol for random access (RA) and data transmission based on two-phase access class barring\n(ACB) mechanisms. Furthermore, the joint optimization algorithmof the two-phaseACBfactors and the number of resource blocks\n(RBs) allocated for RA and data transmission is designed to maximize the number of successful accesses. Finally, simulation results\ndemonstrate that our scheme can significantly improve the number of successful accesses and achieve performance improvement\nin reducing the grant time.
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