Interference-adapted scheduling weight for small-cell in heterogeneous network

A Heterogeneous Network (HetNet) is the mixture network consisted of pico cell, femto cell and relay network in addition to macro cell. A home eNodeB (HeNB) overlays smaller coverage to the macro cell coverage in order to support the local high traffic of Macro eNodeB (MeNB) by off-loading the traffic to the HeNB. In the view point of the spectral efficiency, the frequency band of the HeNB is designed using the same band of the MeNB. However, the inter-cell interference between the MeNB and the HeNB gives harmful effects to both communication qualities of two cells. The performance degradation of the MeNB communication can be avoided by the transmit power control of the HeNB under the interference constraint at Macro User Equipments (MUEs). On the other hand, it is difficult to improve the communication quality of the Home User Equipment (HUE) by the transmit power control or the power allocation, since the transmit power of the HeNB is restricted according to the interference constraint. In addition, the HeNB and the HUE should communicate in the interference environment. Hence, HeNB has to achieve the efficient spectrum access by scheduling without the transmit power control. Therefore, we propose an adaptive interference scheduling for small cell in the HetNet without increasing the feedback information compared with the Proportional Fair Scheduling. Through the computer simulation, we show the effectiveness of the proposed scheduling.