Most locations with access to fiber-optics networks are tall buildings,
the rooftops of which are ideal locations to provide LOS services to the rooftops of surrounding
commercial buildings. Additionally, high-gain and highly directional antennas
can be made use of very effectively in these higher frequencies, allowing for better
reuse of the spectrum and delivery of higher bandwidth.
Figure 15.2 Fiber extension with WiMAX
Metro fiber core
Line of sight
WiMAX BS
WiMAX SS
488 Chapter 15
Backhaul for Cellular/WiFi Hotspot and Muni-Networks
In the U.S., wireless operators had until recently enjoyed the benefit of the FCC mandate
requiring wired infrastructure providers to lease lines to third-party service providers.
With that mandate no longer in existence, the case for alternate means to backhaul
cellular traffic looks more attractive. Additionally, the cost-effective wired backhaul
infrastructure may not be available at all cell sites. This is particularly true as cellular
operators persuade their customers to subscribe to their lucrative broadband services
and need to increase their spectral efficiency by deploying more cell sites.
Pages:
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101