Measurement Counter
R3822:CELL_LOCALSWITCH_LOOP_FAIL_INVALID_STATE
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 local loopback start. If the call processing module at the peer end, however, detects that it is in the other state (for example, it is processing the data service) rather than the stable speech service state, it responds to the call processing module at the end initiating loopback start with a loopback reject message with the cause value of invalid state.
This measurement provides the number of loopback start failures due to invalid state.
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, 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 call processing module at the peer end, however, detects that it is in the other state (for example, it is processing the data service) rather than the stable speech service state, it responds to the call processing module at the end initiating loopback start with a loopback reject message with the cause value of invalid state. 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.