TY - JOUR
T1 - Directional Measurements and Propagation Models at 28 GHz for Reliable Factory Coverage
AU - Chizhik, Dmitry
AU - Du, Jinfeng
AU - Valenzuela, Reinaldo A.
AU - Samardzija, Dragan
AU - Kucera, Stepan
AU - Kozlov, Dmitry
AU - Fuchs, Rolf
AU - Otterbach, Juergen
AU - Koppenborg, Johannes
AU - Baracca, Paolo
AU - Doll, Mark
AU - Rodriguez, Ignacio
AU - Feick, Rodolfo
AU - Rodriguez, Mauricio
PY - 2022/10/1
Y1 - 2022/10/1
N2 - Directional measurements of over 2600 links in four distinct factories at 28 GHz are used to formulate the path gain and azimuth gain models to allow reliable 90% coverage estimates. A simple theoretical model of path gain, dependent on ceiling and clutter heights, is found to represent path gain across the four factories with 4.4 dB root-mean-square error (RMSE), contrasted with 6.9 dB slope-intercept fit and 8.5-14.9 dB RMSE for 3GPP factory models. The model also did well against 3.5 GHz path loss data collected over 18 MHz bandwidth in one of the factories, with an RMSE of 3.3 dB. In nonline-of-sight (NLOS) conditions, scattering reduces available antenna azimuth gain from nominal value by up to 7.3 dB in 90% of links. Line-of-sight (LOS) blockage by a 1.7 m × 1 m obstacle in factory aisle leads to 7 dB signal reduction, attributed to availability of other paths. It is found that an access point (AP) using 25 dBm transmit power per polarization, with 23 dBi nominal gain and omnidirectional terminals, supporting 2× 2 MIMO in a 400 MHz bandwidth, can provide 130 Mb/s for 90% of factory locations within 50 m.
AB - Directional measurements of over 2600 links in four distinct factories at 28 GHz are used to formulate the path gain and azimuth gain models to allow reliable 90% coverage estimates. A simple theoretical model of path gain, dependent on ceiling and clutter heights, is found to represent path gain across the four factories with 4.4 dB root-mean-square error (RMSE), contrasted with 6.9 dB slope-intercept fit and 8.5-14.9 dB RMSE for 3GPP factory models. The model also did well against 3.5 GHz path loss data collected over 18 MHz bandwidth in one of the factories, with an RMSE of 3.3 dB. In nonline-of-sight (NLOS) conditions, scattering reduces available antenna azimuth gain from nominal value by up to 7.3 dB in 90% of links. Line-of-sight (LOS) blockage by a 1.7 m × 1 m obstacle in factory aisle leads to 7 dB signal reduction, attributed to availability of other paths. It is found that an access point (AP) using 25 dBm transmit power per polarization, with 23 dBi nominal gain and omnidirectional terminals, supporting 2× 2 MIMO in a 400 MHz bandwidth, can provide 130 Mb/s for 90% of factory locations within 50 m.
KW - Factory
KW - industrial Internet of Things (IIoT)
KW - measurement
KW - path loss
KW - propagation
UR - http://www.scopus.com/inward/record.url?scp=85131742256&partnerID=8YFLogxK
U2 - 10.1109/TAP.2022.3177546
DO - 10.1109/TAP.2022.3177546
M3 - Journal article
SN - 0018-926X
VL - 70
SP - 9596
EP - 9606
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 10
ER -