Problems for Existing Approaches Associate to Cannot connect Scenarios of suboptimal solutions to BS A due to macro-cell resource constraints For the user 1M -overly crowded basestations 。For the carrier low utilization of femto-cells overload of marco-cells emto B 4/1Problems for Existing Approaches Scenarios of suboptimal solutions • For the user - overly crowded basestations • For the carrier - low utilization of femto-cells - overload of marco-cells femto A femto B 1M 1.3 M 1M 1M 1.3 M Cannot connect to BS A due to resource constraints 1M Associate to macro-cell 1.3 M 4/1