RH3331: CELL_SIG_CH_CALL_DROPS_TCH
This measurement provides the number of times the timer for the target cell waiting for the handover completion expires when the MS, after seizing a signaling channel (TCH) and receiving an HO CMD message from the BSC, fails to access the target cell due to various causes on the radio interface, or provides the number of times the timer for the originating cell waiting for the handover completion expires when the MS fails to return to the original channel.
Integer number or integer.
The value of this counter is calculated according to the following formula.
Call Drops on Signaling Channel (TCH)
= [Failed Internal Intra-Cell Handovers (Timer Expired) (TCHF) (Signaling Channel)] +
[Failed Internal Intra-Cell Handovers (Timer Expired) (TCHH) (Signaling Channel)] +
[Failed Outgoing Internal Inter-Cell Handovers (Timer Expired) (TCHF) (Signaling Channel)] +
[Failed Outgoing Internal Inter-Cell Handovers (Timer Expired) (TCHH) (Signaling Channel)] +
[Failed Outgoing External Inter-Cell Handovers (T8 Expired) (TCHF) (Signaling Channel)] +
[Failed Outgoing External Inter-Cell Handovers (T8 Expired) (TCHH) (Signaling Channel)]