Random early blocking in hierarchical microcellular networks

As is well known, in the next generation wireless networks, call admission control is expected to make efficient use of scarce wireless resources while improving quality-of-service. Although blocking handoff calls is normally more annoying than blocking new calls, blocking new calls reduces resource utilization. By considering a mobility parameter, a novel random early blocking (REB) scheme is proposed to achieve the aforesaid goals in a two-tier cellular network. With REB, new calls are accepted according to some acceptance probability taking into account mobility difference between slow mobility and fast mobility calls. An iterative algorithm is developed to calculate performance measures of interest, i.e., new call blocking probability and forced termination probability. First, simulation results are shown to verify analytical results. Then, numerical results are presented to show the robustness of REB.