Optimal mobile-determined micro-macro cell selection

In a two-tier microcell/macrocell cellular system, to keep the handoff rate at an acceptable level, low mobility users (with speed υ<V₀) should undergo handoffs at microcell boundaries, and high mobility users (with speed υ>V₀) should undergo handoffs at macrocell boundaries. We propose a procedure by which the mobile determines user mobility from microcell sojourn times and uses it for micro-macro cell selection at call origination and handoff. The probability of erroneous assignment of a mobile to a microcell or macrocell is shown to be significantly lower than previous approaches