Abstract
This paper presents radio frequency (RF) capacity estimation for millimeter wave (mm-wave) based fifth-generation (5G) cellular networks using field-level simulations. It is shown that, by reducing antenna beamwidth from 65° to 30°, we can enhance the capacity of mm-wave cellular networks roughly by 3.0 times at a distance of 220 m from the base station (BS). This enhancement is far much higher than the corresponding enhancement of 1.2 times observed for 900 MHz and 2.6 GHz microwave networks at the same distance from the BS. Thus the use of narrow beamwidth transmitting antennas has more pronounced benefits in mm-wave networks. Deployment trials performed on an LTE TDD site operating on 2.6 GHz show that 6-sector site with 27° antenna beamwidth enhances the quality of service (QoS) roughly by 40% and more than doubles the overall BS throughput (while enhancing the per sector throughput 1.1 times on average) compared to a 3-sector site using 65° antenna beamwidth. This agrees well with our capacity simulations. Since mm-wave 5G networks will use arbitrary number of beams, with beamwidth much less than 30°, the capacity enhancement expected in 5G system when using narrow beamwidth antennas would be much more than three times observed in our simulations.
Highlights
Radio capacity is of great concern in cellular systems as it directly dictates the achievable data rates
This paper presents radio capacity estimation for mm-wave based 5G cellular networks using field-level simulations
It is shown that the capacity of microwave and mm-wave networks can be enhanced using narrow beamwidth transmitting antennas
Summary
Radio capacity is of great concern in cellular systems as it directly dictates the achievable data rates. Global mobile data traffic reached 1.5 exabytes per month at the end of 2013, with data traffic growth rate of 81 percent in 2013 compared to 2012 [1] This high demand for cellular data services, especially in large urban markets, puts pressure on operators to keep seeking solutions for realizing higher capacity in their networks. With such an explosive growth in data traffic, the existing mobile infrastructures including the 4G systems will be highly congested in the coming few years. We show that narrow beamwidth antennas have more pronounced capacity enhancements in mm-wave networks than in their microwave counterparts
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