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The authors consider the mobility- and QoS-aware admission control problem for OFDMA femtocell networks. To mitigate strong cross-tier interference in the downlink communication, they assume each macrocell is partitioned into cell center and cell edge zones where femtocells in the edge zone share the same bandwidth with the macrocell while femtocells in the center zone use different bandwidth from that allocated for the macrocell. They propose an admission control algorithm that efficiently associates low-speed and high-speed users with Femto and Macro BSs (FBS and MBS) to avoid large handoff overhead.
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