Institute of Electrical & Electronic Engineers
Heterogeneous Network (HetNet) is considered to be a promising approach to improve spectrum efficiency per area in a Long Term Evolution-Advanced (LTE-A) system and beyond, which allows multiple cells to provide service in an overlaid area. To guarantee stability of the HetNet, one challenge is how to handle inter-cell interference between different cells especially for a control channel that does not support link adaptation or retransmission. In this paper, a novel method is proposed that improves performance of downlink Hybrid Automatic Repeat reQuest (HARQ) feedback channel in HetNet. In the proposed method, legacy control channel transmission is shifted to another sub-frame with a lower interference level.