Call Drops on SDCCH (TA)

Measurement Counter

M3020A : CELL_SD_CALL_DROPS_TA

Description

This measurement provides the number of call drops on the SDCCH of a cell. The causes of the call release are air interface fault, no measurement report from the MS for a long time, Abis interface fault, equipment fault, and forced handover.

Based on the valid TA, level, and quality of the latest call before the call drop, if the TA is greater than the maximum TA of the current value, then the counter, Call Drops on SDCCH (TA), is incremented by one.

Unit

Integer number or integer.

Measurement Point

When a call fails and the BSC sends a Clear Request message to the MSC, this counter is measured.
If the cause in the Clear Command message that the BSC receives from the MSC is not Call Control or Handover Successful and the BSC does not send a Clear Request message to the MSC before receives the Clear Command message, this counter is measured.

Formula

This is an original counter without involving any formula.