Access fail is a key parameter of CDMA technology. Access fail cannot be measured by performance reports extracted from BSC (Base Station Controller).
We can see access fail in our performance report but it is not actual why?
MS try to access the system and send information on access channel, it is possible that due to poor RF environment BTS (Base Transreceiver System) cannot receive the request and does not acknowledge. After several try of MS access fail has been done and BTS does not aware of this as he did not have any information.
BTS only measures access fail of termination calls and access fail occur after first probe received by itself in case of origination call.
Access fail can be measured by drive test.
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