  The problem of wireless M2M communication is twofold: the reliability aspect
and the scalability aspect. The solution of this problem demands a delay
constrained random access protocol. To this end we propose Admission Control
based Traffic Agnostic Delay Constrained Random Access (AC/DC-RA) protocol. Our
main contribution is enabling the stochastic delay constraints agnostic to the
traffic, such that the stochastic delay constraint is valid with respect to
varying number of arrivals. We achieve this with an admission control decision
that uses a novel collision estimation algorithm for active number of arrivals
per contention resource. We use an adaptive contention resolution algorithm to
react to the varying number of arrivals. Using these tools, the admission
control solves the stability problem. We show with simulations that AC/DC-RA
provide stochastic delay constrained random access in a traffic agnostic way to
sustain a stable performance against Poisson and Beta arrivals without any
modification to the protocol.
