Specifications

Location Handover
Handover
August 08, 2000 68P81095E55-E D-5
Reliability
The reliability of the radio link in the iDEN system considers three broad categories.
•Contour
•Area
•System
Contour Reliability Contour reliability relates to the ability to maintain and control the radio link within
the propagation pattern of a cell. Anywhere in the pattern if 100 calls are made with
10 failures the contour has a 90% reliability. Within limits, the radio link quality is
to be better closer to the cell site.
Area Reliably An Area reliability uses the location concept. Since more than one cell may have a
sound link, the ability to maintain a call is improved when more that one radio path is
available. Generally, area reliabilities are higher than contour reliabilities. If the
average of reliabilities in a total coverage are 90% (contour reliablities). The area
reliability will typically be about 97%.
System The system reliability can be calculated by finding the average or the mean of all the
area and/or contour reliabilities