One of the most important problems posed by cellular-based machine type communications is congestion. Congestion concerns both the radio access network and the mobile core network, impacting both the user data and the control planes. In this paper, we address the problem of congestion in machine type communications. We propose a congestion-aware admission control solution that selectively rejects signaling messages from MTC devices at the radio access network following a probability that is set based on a proportional integrative derivative controller reflecting the congestion level of a relevant core network node. We evaluate the performance of our proposed solution using computer simulations. The obtained results are encouraging. In fact, we succeed in reducing the amount of signaling, to reach a target utilization ratio of resources in the core network.
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