BTS surveys the upward signal , these data are saved in BSS. When the processing result indicated handover, the network basis processing result, carries on lining up to the handover candidate cell, MS decides which cell again, the process is called the handover algorithm. The handover algorithm divides into the data processing process, the cell queuing process and the cell decision process, regarding these process's algorithm in the GSM standard, has not given the rigid stipulation, has given a suggestion algorithm in the GSM standard 05.08 appendices, the localization algorithm which Ericsson Corporation uses is merely in BSC decided that the cut condition one kind of software algorithm, the BSC basis survey's information carries on to the periphery cell quite lines up, this is called“Locating”in the handover process. The Locating primary data and serves the cell by the traveling carriage to survey separately then delivers the BSC computation, MS carry on the survey to the downlink, this survey including the current cell and six neighbor cell's downward signal strength and the downward signal quality, will carry on the survey through the SACCH channel transmission for BTS, BTS carry on the up link, this survey report including upward signal strength and signal quality as well as TA value. BSC analysis the survey report which delivers MS and BTS survey report, the information include: MS actual lead, power rank, BA change instruction position, DTX use instruction, downlink Quality, 6 neighbor cell receive level, carrier frequency number, BSIC value.
