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Reply To: Call Setup Time


It means the MS cannot access the TCH that was allocated by the BTS. Possible problem :

– HW problem :
—TRX BCCH in one sector, TRX TCH on another sector
— poor TX or poor RX of TRX TCH (Path balance)

– SW problem :
— some timeslots cannot be allocated in the TRX (?)

– Radio problems :
— Poor coverage
— High interference on the TCH frequency, whereas the SDCCH frequency is clean
— Too much GPRS traffic –> TS are allocated as PDCH, therefore no more TS for voice. Maybe the PDCH are kept alive for a duration too long after the transfer has been finished.