A GNU radio testbed for distributed polling service-based medium access control

Medium access control (MAC) protocols play a vital role in wireless networking. It is well-known that the high control overhead of IEEE 802.11 MAC is the limiting factor on wireless networks capacity. In our prior work, polling service-based MAC protocols (PSMACs) are developed to amortize the high control overhead over multiple frame transmissions, thus achieving higher efficiency. Both analysis and simulations are conducted to validate the efficacy of the proposed protocols. In this paper, we extend this work by implementing the distributed version of PSMAC, i.e., PSMAC 2, on the GNU Radio and Universal Software Radio Peripheral (USRP) platform. We discuss various design considerations and challenges of prototyping PSMAC 2, and carry out extensive experimental studies with the PSMAC testbed. Our experimental results are found to be consistent with the theoretical study reported in our prior work, and validate the advantages of PSAMC under a realistic setting.