The handset can survey 32 neighbor cell signal, but in reporting for the BTS survey report which most contains 6 cell metrical data. BSC receives the survey report which BTS sends, first carries on the following processing to the survey report: The GSM system establishes a timer for the continual two cut gap (TINIT), to prevent to carry on the cell cut frequently, after each time cuts, must wait for after the timer counts, can carry on the next time cut. Right CELLQ was the HIGH highly quality cell (refers to wireless environment and terrain is quite good, signal quality quite good cell) BSC did not need to do to its report processes immediately, was only carries on the sketchy analysis and processing, right CELLQ was the LOW inferior cell (refers to wireless environment and terrain is complex, signal quality quite bad cell) BSC must do to its report processes immediately, moreover carried on the fine analysis and processing, moreover through establishment parameter MISSNM to reported lost the value made a limit, decided the survey report the precision, if the value were time 2, if lost above 2 survey reports, then front report did not calculate that makes a fresh start to collect. The Locating algorithm makes some mathematical model to many reports processing in certain amount of time, this time is called the filter length, but this model is called the filter model. Through QLENSD, QLENSI, SSLENSD, SSLENSI, TAAVELEN to process the quality, the signal strength, the advance timing, and all kinds of report time lengths to carry on the establishment.
