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Network-Listening Based Synchronization with Loop-Back Interference Avoidance Using Synchronization Signal
Mitsukuni KONISHI Sho NABATAME Daigo OGATA Atsushi NAGATE Teruya FUJII
IEICE TRANSACTIONS on Communications
Publication Date: 2018/03/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
overlaid cell structure, HetNet, small cell, timing synchronization, network listening, radio-interface based synchronization,
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Network-listening-based synchronization is recently attracting attention as an effective timing synchronization method for indoor small-cell base stations as they cannot utilize GPS-based synchronization. It uses only the macro-cell downlink signal to establish synchronization with the overlaying macro cell. However, the loop-back signal from the small-cell base station itself interferes with the reception of the macro-cell downlink signal in the deployment of co-channel heterogeneous networks. In this paper, we investigate a synchronization method that avoids loop-back interference by muting small-cell data transmission and shifting small-cell transmission timing. Our proposal enables to reduce the processing burden of the network listening and mitigate the throughput degradation of the small cell caused by the data-transmission mutation. In addition to this, the network-listening system enables the network listening in dense small cell deployments where a large number of neighboring small cells exist. We clarify the performance of our proposal by computer simulations and laboratory experiments on actual equipment.