Measurement Counter
R3823:CELL_LOCALSWITCH_LOOP_FAIL_BTS_FAIL
Description
After the call is put through or the incoming BSC handover for the speech service is complete, 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 during the BTS local loopback start. The call processing module at the peer end sends a BTS loopback request message to the BTS. The BTS speech loopback in the cell that serves the called MS fails because of various reasons. Then, the BTS responds to the call processing module with a BTS loopback acknowledgement message with the cause value of BTS loopback failure. After that, the call processing module at the peer end returns a loopback acknowledgement message to the call processing module at the end initiating loopback start with the cause value of failures on the BTS side.
This measurement provides the number of loopback start failures due to failures on the BTS side.
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 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. The call processing module at the peer end sends a BTS loopback request message to the BTS. The BTS speech loopback in the cell at the peer end fails because of various reasons. Then, the BTS responds to the call processing module with a BTS loopback acknowledge message with the cause value of BTS loopback failure. After that, the call processing module at the peer end returns a loopback acknowledgement message to the call processing module at the end initiating loopback start with the cause value of failures on the BTS side. In this case, this counter is measured in the cell where the loopback start is initiated.
Formula
This is an original counter without involving any formula.