Random access protocols are a key feature of a family of emerging communication networks such as\nmachine-to-machine, radio frequency identification (RFID), and sensor networks. To accommodate the needs of such\nnetworks with a massive number of uncoordinated devices, new random multiple access (MAC) protocols have been\nproposed that aim to improve the system efficiency by resolving collisions in the received signal. In this work, we\nconsider one of such protocols, called frameless ALOHA, and propose two techniques to improve its energy efficiency\nwithout sacrificing the network throughput. More specifically, we propose mechanisms to adaptively control the\naccess probability at the users. The proposed mechanisms are local and like the original frameless ALOHA, no\ncoordination between the users is needed. Our simulation results verify the improvement achieved in the energy\nefficiency by the proposed techniques
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