Hello, everyone!
Today, I would like to continue and share with you about the techno-economic model - access network architecture for WiMAX.
a) System Architecture
Fig. 1. Block Diagram of the baseline WiMAX system architecture
The above Fig. 1 shows the WiMAX system architecture used in the techno-economic model. The “air” segments can replace the distribution and drop segment presented in below Table 1.
Table 1. Components used for wired technologies
b) Components
According to the network architecture, the radio access network basically includes base stations, sites and “last mile” transmission. We therefore assume that the architecture is composed of a BS in the central end, a station in the subscriber side, and a PMP topology (between BS and CPE).
For capacity limited deployment scenarios it is necessary to position base stations with a BS to BS spacing sufficient to match the expected density of end customers. Data density is an excellent metric for matching capacity to market requirements. Demographic information including population, households and businesses per sq Km is readily available from a variety of sources for most metropolitan areas. With this information and the expected services to be offered along with an expected market penetration, data density requirements are easily calculated.
Base stations (towers) and base station equipment does not need to be installed in totality during the first year, but can be displayed over a period of time to address specific market segments or geographical areas of interest for the operator. However, in an area with a high number of potential subscribers, it is desirable to install a sufficient number of base stations to cover an addressable market large enough to quickly recover the fixed infrastructure cost.
The common cost elements assumed in our model are in terms of Base Station the upfront costs; sector costs (including transducer and antenna); and Installation cost (co-siting, new site); Customer Premise Equipment (CPE): Indoor/Outdoor CPE; and Installation of the CPE, besides Operation, Administration and Maintenance (OAM).
Table 2. WiMAX architecture components
It is rather important to calculate the required number of FWA base stations and sectors to fulfill the traffic capacity demands of all the subscribers in a given service area. The first step is the prediction of aggregate subscriber traffic in the service area. The number of the required BS is calculated as a function of the demand specified by the service area to be covered; average capacity required per user during busy hour; and number of subscribers within the coverage area.
When radius of service-area cell is small, there are many cells of total service area. When the radius of the service-area cell is large, the number of cells is smaller in a total service area. This is the reason why total construction relative cost is decreasing when radius of service area is increasing.
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