tailieunhanh - Residential Wireless Coverage

The wireless carrier turned to its longtime business partner, ADC, for help. Network technicians analyzed a cluster of 11 BTS sites for a two-week period. Each BTS site included a three-sector, diversity tower with the average height of each tower at 180 feet. Dropped Call (DC) and Failed Call Attempt (FCA) data was gathered on each sector of each tower. | CASE STUDY THE SITUATION Unacceptable network quality is one of the main reasons for mobile subscriber churn. With industry churn rates as high as 25 percent annually a service provider s entire customer base could be lost in a matter of a few years. A majority of these users will cite dropped and failed calls as the primary reasons for the switch. The cost of acquiring new subscribers to replace the existing customer base can be enormous with Subscriber Acquisition Costs SAC at approximately 350- 400 per subscriber. Improvements in quality of service can directly impact a carrier s profitability through the cost savings associated with increased subscriber retention and the additional revenue gained from increased billable minutes of use resulting from improved signal quality. This improvement in signal quality will come from a combination of better noise figures and lower interference levels. THE PROBLEM One of the nation s largest wireless carriers wanted to improve dropped call DC and failed call attempt FCA rates for part of its network in the southeastern United States. The region comprising approximately 53 square miles in a densely populated residential area included 11 CDMA Base Transceiver Station BTS sites. The wireless carrier had two options Build additional expensive BTS sites or enhance the existing sites to improve signal strength and reduce interference for a fraction of the cost. CASE STUDY THE ADC SOLUTION The wireless carrier turned to its longtime business partner ADC for help. Network technicians analyzed a cluster of 11 BTS sites for a two-week period. Each BTS site included a three-sector diversity tower with the average height of each tower at 180 feet. Dropped Call DC and Failed Call Attempt FCA data was gathered on each sector of each tower. DC and FCA rates were unacceptable for many of the BTS sites within the cluster. In fact field tests revealed that more than five percent of all mobile calls in the region experienced service failure