Future Investment Needs
163
Figure 5.5 Sensitivity of Coverage Gap and Public Funding Gap to Revenue Potential for Voice Services (Sub-Saharan Africa)
coverage gap (percentage of population)
a. Impact of various revenue assumptions on the coverage gap 40 35 30 25 20 15 10 5 0 0
1
3 6 revenue potential (% of GDP)
9
12
b. Impact of various revenue assumptions on the public funding gap public funding gap (billions of dollars)
16 14 12 10 8 6 4 2 0 0
3
6 9 revenue potential (% of GDP)
12
Source: Mayer and others 2009.
The spatial analysis developed for the study relies on assumptions for the area covered by a single GSM cell site. In rural areas, the standard cell-site area was set at a maximum of 1,662 square kilometers (km2). This is equivalent to a circular area with a radius of approximately 23 km. This radius is well within the functionality of commercially available extended-range GSM base stations, which report coverage radii of up to