Topics: WiMAX, Engineering, Network architecture Pages: 2 (385 words) Published: July 14, 2013



Part III in a series on how to plan a city-wide wireless WiMAX network. Once a municipality or operator has considered the business model and financial aspects of the WiMAX network and a comprehensive initial site survey has been completed, a preliminary design is required. The design will leverage the assets and information gained from the site survey and allow the engineer to make a cost effective design choice in terms of equipment and architecture.

A comprehensive initial network design will include the following: A summary of the overall network objectives, goals, expectations, advantages and challenges from a user and network architecture perspective. This overview should include bandwidth considerations, link availability, frequency selection, number of sites and sectors, type of systems recommended, etc. The design document will include a network blueprint complete with a detailed parts list showing recommended vendors for access points, cabling, back-up power units, antennas, switches, surge supressors, connectors, jumpers, etc. A complete "all-in" cost including final engineering, site acquisition, integration, testing, training, site optimization and rigger costs Detailed point to point backhaul RF link budgets and path profiles for each link in the network.

A detailed path analysis and link budget for each link in the network including calculations for free space loss, connector and cable losses,, link availability (i.e. 99.999% reliability) and downtime in seconds per year. Results of spectrum and noise analysis that were performed during the site survey. The noise analysis is required to determine the baseline for acceptable signal strength levels. Tower leg, water tank railing or ladder measurements so that the appropriate mounting brackets and clamps can be procured.

Detailed hardware-specific multipoint propagation analysis with coverage estimates superimposed on geographic, political or satellite...
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