Measurement Counter
K3020: CELL_KPI_TCH_REQ_SIG
Description
In the very early TCH assignment procedure, this measurement provides the number of CHAN RQD messages that the BTS receives from the BTS.
Unit
Integer number or integer.
Measurement Point
After receiving a CHAN RQD message from the BTS, the BSC assigns a channel at A, as shown in the following figure. If the access cause is emergency call or call re-establishment, and the BSC supports very early TCH assignment, the BSC assigns a TCH to carry signaling. If no SDCCH is available and the SDCCH is not the only choice for location updating, the BSC automatically assigns a TCH to carry signaling, and this counter is incremented by one.
Formula
TCH Seizure Requests (Signaling Channel) =
[Channel Assignment Requests in Immediate Assignment Procedure (TCH)]