Measurement Counter
R381:CELL_LOCALSWITCH_LOOP_START_TRY
Description
After the call is put through or the incoming BSC handover for the speech service is complete, the end initiating loopback start sends a loopback request to the peer end if the BSC/BTS local switch start conditions are met and if it is detected that the calling and called MSs are served by the same BSC.
This measurement provides the number of loopback start attempts.
Unit
Integer number or integer.
Measurement Point
After the BSC receives the CONNECT ACK message from the MSC in the MS terminated call procedure, as shown in Figure 1(A1), or after the BSC receives the HANDOVER CMP message from the MS in the incoming BSC handover procedure, as shown in Figure 2(B1), the BSC selects the BSS local switch policy, determines whether the conditions for initiating BSC/BTS local switch are met, and performs local switch call detection. If the calling and called MSs are served by the same BSC, the call processing module initiating loopback start in the BSC sends a loopback request message to the call processing module at the peer end in the BSC. In this case, this counter is measured when the calling MS sends a loopback request message or when the called MS receives a loopback request message.
Formula
This is an original counter without involving any formula.