Two presentations were given by Reina Taniguchi and Makoto Nakamura for the following papers in Technical Committee on Smart Radio (SR) and Radio Communication Systems (RCS) 2018 in Hakodate.

  • Reina Taniguchi, Teruya Fujii, Hideki Omote and Kei Sakaguchi, “A study on Transit Interference Canceler in HetNet Construction“, IEICE Tech. Rep., vol. 118, no. 125, RCS2018-81, pp. 7-12, July 2018.

HetNet which deployed multiple small cells using the same frequency inside the macro cell is expected as a technology for improving frequency utilization efficiency in mobile communication systems. In HetNet, to cancel or avoid the interference from a macrocell is essential to keep maintaining the frequency utilization efficiency. In this paper, we propose “network coordinated small cell transmission interference canceller”, which cancels the interference from the macro cell by superimposing the cancellation signal on each small cell signal. In general, the transmission power of each small cell is limited. So we propose some control technologies considering maximum transmission power in small cells and evaluate the performance of proposed technologies by using Shannon capacity.

  • Makoto Nakamura, Gia Khanh Tran and Kei Sakaguchi, “Interference Management for Millimeter-Wave Mesh Backhaul Networks“, IEICE Tech. Rep., vol. 118, no. 126, SR2018-53, pp. 151-158, July 2018.

Recently, since mobile traffic increases rapidly, 5G network is required to support eMBB communications. Self-backhauling mmWave overlay heterogeneous network is proposed to realize eMBB at low cost. However, intra-channel interferences among mmWave backhaul links become an issue. This work proposes solutions to this problem through several approaches including proper deployment of mmWave access point, channel allocation when necessary, beam selection including other direction than line of sight, and finally optimal power transmission allocation for alleviating bottleneck of the mesh backhaul networks. Ray-tracing based simulation result shows that the proposed algorithm can cope with bottleneck of the backhaul networks through the effects of the employed interference management schemes.