Abstract
Beam management is central in the operation of beamformed wireless cellular systems such as 5G New Radio (NR) networks. Focusing the energy radiated to mobile terminals (MTs) by increasing the number of beams per cell increases signal power and decreases interference, and has hence the potential to bring major improvements on area spectral efficiency (ASE). This paper proposes a first system-level stochastic geometry model encompassing major aspects of the beam management problem: frequencies, antenna configurations, and propagation; physical layer, wireless links, and coding; network geometry, interference, and resource sharing; sensing, signaling, and mobility management. This model leads to a simple analytical expression for the effective rate that the typical user gets in this context. This in turn allows one to find the number of beams per cell and per MT that maximizes the effective ASE by offering the best tradeoff between beamforming gains and beam management operational overheads and costs, for a wide variety of 5G network scenarios including millimeter wave (mmWave) and sub-6 GHz. As part of the system-level analysis, we define and analyze several underlying new and fundamental performance metrics that are of independent interest. The numerical results discuss the effects of different systemic tradeoffs and performance optimizations of mmWave and sub-6 GHz 5G deployments.
Highlights
The ever-increasing demand in capacity for mobile communications necessitates new implementation approaches that can significantly boost data rates and the area spectral efficiency (ASE) of mobile networks
The system-level mathematical framework for beam management in 5G radio access network (RAN) presented in this paper captures
This framework leads to the definition of several new key performance metrics proper to 5G New Radio (NR) RANs; stochastic geometry was used to derive closed-form expressions of
Summary
The ever-increasing demand in capacity for mobile communications necessitates new implementation approaches that can significantly boost data rates and the area spectral efficiency (ASE) of mobile networks. 5G is designed to make use of spectrum above 20 GHz, where bandwidth sizes of up to 400 MHz per carrier can be used to offer very high data rates (above 10 Gbps peak rates) and increase the network capacity [3]; the sub-6 GHz bands, with up to 100 MHz of bandwidth per carrier, are still needed to ensure wide area coverage and data rates up to a few Gbps [4]. Kalamkar was with INRIA when this work was done.
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