Coverage and Rate Analysis

MmWave

Coverage and Rate Analysis of Millimeter Wave Cellular Systems

The millimeter wave (mmWave) band offers the potential for large bandwidth communication channels in cellular networks. It is not clear, however, whether both high data rates and good signal-to-noise-and-interference ratio (SINR) coverage can be achieved in mmWave cellular networks; as the propagation conditions and hardware constraints become different, and prior microwave network models do not directly apply to mmWave systems. In our work, we have proposed analytical mmWave network models using stochastic geometry and random shape theory. Our model incorporates key features of mmWave cellular systems, such as blockage effects and directional beamforming.

Recent Results

In our group, we have derived expressions for the SINR and rate distributions as functions of the base station density, parameters of blockages (e.g. buildings in urban areas), and geometries of beamforming. We find that mmWave networks will transit from a power-limited regime to interference-limited regime when increasing base station density. More importantly, we show that mmWave cellular networks can achieve comparable SINR coverage and significantly higher achievable rate than conventional microwave networks when the base station density is sufficiently high. Besides, our analyses show that in (ultra) dense mmWave networks, the SINR and rate performance is mostly determined by the ratio of base station density to the blockage density, and that increasing base station density need not improve SINR and rate performance.

Select Publications

T. Bai and R. W. Heath, Jr., “Analysis of coverage and rate in millimeter wave cellular networks“, To appear in IEEE Transactions on Wireless Communications, 2014, ArXiv preprint, arXiv:1402.6430

T. Bai, A. Alkhateeb, and R. W. Heath, Jr., “Coverage and Capacity of Millimeter Wave Cellular Networks“, IEEE Communications Magazine, September 2014.

S. Akoum, O. El Ayach and R. W. Heath, Jr., “Coverage and Capacity in mmWave Cellular Systems“, In Proc. of the IEEE Asilomar Conference on Signals, Systems and Computers (Asilomar) , pp. 688-692, Pacific Grove, CA, November 4-7, 2012.

T. Bai, and R. W. Heath, Jr., “Coverage analysis for millimeter wave cellular networks with blockage effects“, In Proc. of IEEE Global Conference on Signal and Information Processing (GlobalSIP), Dec. 2013.

T. Bai, and R. W. Heath, Jr., “Coverage in dense millimeter wave cellular networks“, In Proc. of the 47th Asilomar Conference on Signals, Systems and Computers (ASILOMAR), pp. 1–5, Nov. 2013.

T. Bai, V. Desai, and R. W. Heath, Jr., “Millimeter wave cellular channel models for system evaluation”, In Proc. of IEEE ICNC, Honolulu, HI, Feb. 2014.

This work is supported by the National Science Foundation under Grants No. 1218338 and 1319556, and by a gift from Huawei.

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