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This paper studies the cross-layer challenges and performance of HybridBeamforming (HBF) and Multi-User Multiple-Input Multiple-Output (MU-MIMO) in 5Gmillimeter wave (mmWave) cellular networks with full-stack TCP/IP traffic andMAC scheduling. While previous research on HBF and MU-MIMO has focused onlink-level analysis of full-buffer transmissions, this work reveals theinterplay between HBF techniques and the higher layers of the protocol stack.To this aim, prior work on full stack simulation of mmWave cellular network hasbeen extended by including the modeling of MU-MIMO and HBF. Our results revealnovel relations between the networking layers and the HBF MU-MIMO performancein the physical layer. Particularly, throughput can be increased in 5G networksby means of Spatial Division Multiple Access (SDMA). However, in order toachieve such benefits it is necessary to take into account certain trade-offsand the implementation complexity of a full-stack HBF solution.

Hybrid Beamforming in 5G mmWave Networks: a Full-stack Perspective