A Closed-Loop UL Power Control Scheme for Interference Mitigation in Dynamic TD-LTE Systems

摘要

The TD-LTE system is envisaged to adopt dynamic time division duplexing (TDD)transmissions for small cells to adapt their communication service to the fastvariation of downlink (DL) and uplink (UL) traffic demands. However, differentDL/UL directions for the same subframe in adjacent cells will result in newdestructive interference components, i.e., eNB-to-eNB and UE-to-UE, with levelsthat can significantly differ from one subframe to another. In this paper, afeasible UL power control mechanism is proposed to manage eNB-to-eNBinterference, where different UL power control parameters are set based ondifferent interference level. We consider the geometric location informationand the subframe set selection process about adjacent eNBs when theinterference level is estimated. The performance of the proposed scheme isevaluated through system level simulations and it is shown that the scheme canachieve preferable improvement in terms of UL average and 5%-ile packetthroughputs compared with the original scheme without power control. Also, theUE-to-UE interference is not worse when the UE transmit power become higher.