Number of Loopback Start Failures (Not Support by the BTS)

Measurement Counter

R3826:CELL_LOCALSWITCH_LOOP_FAIL_BTS_NOT_SUPPORT

Description

After the call is put through or the incoming BSC handover for the speech service is complete, the BSC selects the general strategy of BSS local switch, determines whether the conditions for initiating local switch are met, and performs local switch call detection in the local loopback procedure. If all the local switch conditions are met, the BSC/BTS local loopback start procedure is started. Within the BSC, the call processing module initiating loopback start at one end sends a loopback request message to the call processing module at the peer end. If the BTS serving the ongoing call does not support loopback, the call processing module at the peer end responds to the call processing module at the TX end with a loopback acknowledgement message with the cause value of Not Support by the BTS. The loopback start fails.

This measurement provides the number of loopback start failures (Not Support by the BTS).

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 the local switch are met, and performs local switch call detection. If all the local switch conditions are met, the BSC/BTS local loopback start procedure is started. Within the BSC, the call processing module initiating loopback start at one end sends a loopback request message to the call processing module at the peer end. If the BTS serving the ongoing call does not support loopback, the call processing module at the peer end responds to the call processing module at the TX end with a loopback acknowledgement message with the cause value of Not Support by the BTS. The loopback start fails. In this case, this counter is measured in the cell where the loopback start is initiated.

Figure 1 Local switch in MS terminated call procedure

Figure 2 Local switch in the incoming-BSC handover procedure for the speech service

Formula

This is an original counter without involving any formula.