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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
Publication
IEICE TRANSACTIONS on Communications
Vol.E101-B
No.3
pp.885-896 Publication Date: 2018/03/01 Publicized: 2017/09/11 Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3122 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: overlaid cell structure, HetNet, small cell, timing synchronization, network listening, radio-interface based synchronization,
Full Text: PDF(5.7MB)>>
Summary:
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.
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