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Novel Method to Improve Control Channel Reliability in LTE-Advanced Heterogeneous Network

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3 Author(s)
Yajun Zhu ; DOCOMO Beijing Commun. Labs. Co., Ltd., Beijing, China ; Anxin Li ; Harada, A.

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 subframe with a lower interference level. Simulation results demonstrate that the downlink HARQ feedback channel performance can be significantly improved in both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems.

Published in:

Vehicular Technology Conference (VTC Fall), 2012 IEEE

Date of Conference:

3-6 Sept. 2012