Measurement Counter
M3152a:CELL_CALL_DROPS_LOOP_RESTORE_OTHER_FAIL_TIMES_BTS_LOOP_TCHF
Description
After the call is put through or the incoming BSC handover for the speech service is complete, the BSC selects the BSS local switch policy, determines the local switch start conditions, and performs local switch call detection in the local loopback procedure. If all the local switch conditions are met, the BTS loopback procedure is started. The loopback, however, fails because of other reasons (rather than Territorial Resource Request Failure and Failures on the BTS Side). Then, the BSC regards it as a call drop and releases the call directly.
This measurement provides the number of call drops on TCHF due to failures to return to normal call from BTS loopback (others).
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 for the speech service, as shown in Figure 2 (B1), the BSC selects the BSS local switch policy, determines the local switch start conditions, 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, however, responds with a loopback reject message because of other reasons (rather than Territorial Resource Request Failure and Failures on the BTS Side). The loopback start fails. Then, the BSC regards it as a call drop and releases the call directly. If the channel that carries the call during the call drop is a TCHF, this counter is measured.
Formula
This is an original counter without involving any formula.