Joint Access Control and Subchannel Allocation Scheme for OFDMA Femtocell Network Using a Truthful Mechanism.

Femtocells are low-power cellular base stations that can improve indoor coverage and offload data traffic from the macrocell network. Nevertheless, access control that has strong impacts on interference mitigation is still an important issue for the femtocell network. In this paper, we consider a two-tier orthogonal frequency division multiple access (OFDMA) femtocell network that contains one macrocell base station (MBS), several femtocell access points (FAPs) and femtocell user equipments (FUEs). In particular, FUEs can get better service by selecting FAPs properly according to their reported channel information and pay for the resource they use. However, since channel information is private, FUEs cannot know the truth. So FAPs have incentive to report exaggerated information to win greater opportunity to be selected by FUEs and gain more payments. We propose a joint access control and subchannel allocation (JACSA) scheme to solve the truth-telling problem and provide a suboptimal subchannel allocation solution. Further analysis shows that by adding a transfer payment to each FAP, the maximum expected total payment can only be obtained when all FAPs report the true information. Moreover, the subchannel allocation solution can achieve near optimal performances with low computational complexity compared with the optimal subchannel allocation (OSA) scheme [ABSTRACT FROM AUTHOR]