| Popis: |
In heterogeneous networks, the evolved NodeBs (eNBs) have different downlink transmission power and the power imbalance problem can not be avoided. In order to solve this problem, Uplink/Downlink (UL/DL) split for users in Cell Range Expansion (CRE) region of small cells has been proposed in 3GPP. UL/DL split users are connected with macro cells and small cells simultaneously. In this paper, we propose an uplink power control scheme based on game theory for UL/DL split users. In the scheme, the convex pricing function is an exponential pricing function of users' transmission power, which reflects the interference that macro users are suffering from UL/DL split users. It can ensure that UL/DL split users will be penalized when they cause serious interference to macro users. The power control scheme based on non-linear convex pricing obtains more improvements than the linear one with numerical simulations. Furthermore, a Dynamic Power Adjustment (DPA) algorithm is added to the scheme in order to mitigate interference in uplink and to speed up the convergence process. |
