Measurement of Call Drops due to Connection Failure in Stable State

Measurement Counter

M3001A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_SD

M3001B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_SD

M3001C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_SD

M3001D:CELL_CALL_DROPS_CONN_FAIL_NO_RADIO_RES_SD

M3001E:CELL_CALL_DROPS_CONN_FAIL_OTHER_SD

M3401A:CELL_CALL_DROPS_CONN_FAIL_RL_TCHF_SIG

M3401B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_TCHF_SIG

M3401C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_TCHF_SIG

M3401D:CELL_CALL_DROPS_CONN_FAIL_RADIO_RES_NO_TCHF_SIG

M3401E:CELL_CALL_DROPS_CONN_FAIL_OTHER_TCHF_SIG

M3501A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_TCHH_SIG

M3501B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_TCHH_SIG

M3501C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_TCHH_SIG

M3501D:CELL_CALL_DROPS_CONN_FAIL_NO_RADIO_RES_TCHH_SIG

M3501E:CELL_CALL_DROPS_CONN_FAIL_OTHER_TCHH_SIG

M3101A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_TCHF_TRAF

M3101B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_TCHF_TRAF

M3101C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_TCHF_TRAF

M3101D:CELL_CALL_DROPS_CONN_FAIL_RADIO_RES_NO_TCHF_TRAF

M3101E:CELL_CALL_DROPS_CONN_FAIL_OTHER_TCHF_TRAF

M3201A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_TCHH_TRAF

M3201B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_TCHH_TRAF

M3201C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_TCHH_TRAF

M3201D:CELL_CALL_DROPS_CONN_FAIL_NO_RADIO_RES_TCHH_TRAF

M3201E:CELL_CALL_DROPS_CONN_FAIL_OTHER_TCHH_TRAF

M3611A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_SIG_ULCELL

M3611B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_SIG_ULCELL

M3611C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_SIG_ULCELL

M3611D:CELL_CALL_DROPS_CONN_FAIL_RADIO_RES_NO_SIG_ULCELL

M3611E:CELL_CALL_DROPS_CONN_FAIL_OTHER_SIG_ULCEL

M3311A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_TRAF_ULCELL

M3311B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_TRAF_ULCELL

M3311C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_TRAF_ULCELL

M3311D:CELL_CALL_DROPS_CONN_FAIL_RADIO_RES_NO_TRAF_ULCELL

M3311E:CELL_CALL_DROPS_CONN_FAIL_OTHER_TRAF_ULCELL

M3621A:CELL_CALL_DROPS_CONN_FAIL_RL_FAIL_SIG_OLCELL

M3621B:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_SIG_OLCELL

M3621C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_SIG_OLCELL

M3621D:CELL_CALL_DROPS_CONN_FAIL_RADIO_RES_NO_SIG_OLCELL

M3621E:CELL_CALL_DROPS_CONN_FAIL_OTHER_SIG_OLCELL

M3321A:CELL_CALL_DROPS_CONN_FAIL_HO_ACCESS_FAIL_TRAF_OLCELL

M3321B:CELL_CALL_DROP_CONN_FAIL_HO_ACCESS_FAIL_TRAF_OL

M3321C:CELL_CALL_DROPS_CONN_FAIL_OM_INTERVENTION_TRAF_OLCELL

M3321D:CELL_CALL_DROPS_CONN_FAIL_RADIO_RES_NO_TRAF_OLCELL

M3321E:CELL_CALL_DROPS_CONN_FAIL_OTHER_TRAF_OLCELL

Description

After the MS seizes a channel, the BTS sends the BSC a CONN FAIL message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer. If the cause value carried in the CONN FAIL message received by the BSC is radio link failure (0x01), handover access failure (0x02), om intervention (0x07), or radio resource not available (0x21), this measurement provides the number of call drops related to CONN FAIL IND on the basis of the channel type (SDCCH, TCHF, or TCHH), the service type (signaling or traffic), the concentric attribute (overlaid subcell or underlaid subcell), and the cause value.

Unit

Integer number or integer.

Measurement Point

The specific counter is incremented by one when the BSC receives a CONN FAIL IND message.

The counter is measured at A2, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5.

Figure 1 Call drops in the immediate assignment (including very early assignment) procedure

A1: Call Drops Due to ERR IND Received in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Overlaid Subcell in Stable State

A2: Call Drops Due to the CONN FAIL IND Received in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Overlaid Subcell in Stable State

A3: Call Drops Due to REL IND Received in Stable State, Call Drops Due to the REL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the REL IND Received on the TRX in the Overlaid Subcell in Stable State

A4: Call Drops Due to No MRs from MS for a Long Time, Call Drops Due to No MR from the MS on the TRX in the Underlaid Subcell, Call Drops Due to No MR from the MS on the TRX in the Overlaid Subcell, Call Drops due to Abis Terrestrial Link Failure, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Underlaid Subcell, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Overlaid Subcell, Call Drops Due to Equipment Failure, Call Drops Due to TRX Failure in the Underlaid Subcell, Call Drops Due to TRX Failure in the Overlaid Subcell, Call Drops due to Resource Check, Call Drops Due to Resource Check on the TRX in the Underlaid Subcell, Call Drops Due to Resource Check on the TRX in the Overlaid Subcell

A5: Clear Requests Sent on the A Interface

A6: Call Drops Due to Forced Handover, Call Drops Due to Forced Handover on the TRX in the Underlaid Subcell, Call Drops Due to Forced Handover on the TRX in the Overlaid Subcell

A10: Successful SDCCH Seizures (Call Type)

Figure 2 Call drops in the assignment and intra-cell handover (TCH handover) procedure

A1: Call Drops Due to ERR IND Received in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Overlaid Subcell in Stable State

A2: Call Drops Due to the CONN FAIL IND Received in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Overlaid Subcell in Stable State

A3: Call Drops Due to REL IND Received in Stable State, Call Drops Due to the REL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the REL IND Received on the TRX in the Overlaid Subcell in Stable State

A4: Call Drops Due to No MRs from MS for a Long Time, Call Drops Due to No MR from the MS on the TRX in the Underlaid Subcell, Call Drops Due to No MR from the MS on the TRX in the Overlaid Subcell, Call Drops due to Abis Terrestrial Link Failure, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Underlaid Subcell, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Overlaid Subcell, Call Drops Due to Abis Link Failures in Stable Loopback State, Call Drops Due to Equipment Failure, Call Drops Due to TRX Failure in the Underlaid Subcell, Call Drops Due to TRX Failure in the Overlaid Subcell, Call Drops Due to Resource Check, Call Drops Due to Resource Check on the TRX in the Underlaid Subcell, Call Drops Due to Resource Check on the TRX in the Overlaid Subcell, Call Drops Due to Handover Failure During the Loopback, Call Drops Due to Other Causes in Stable State

A5: Clear Requests Sent on the A Interface, Call Drops after Answer, Call Drops After Answer on the TRX in the Underlaid Subcell, Call Drops After Answer on the TRX in the Overlaid Subcell

A6: Call Drops Due to Forced Handover, Call Drops Due to Forced Handover on the TRX in the Underlaid Subcell, Call Drops Due to Forced Handover on the TRX in the Overlaid Subcell, Failed Internal Intra-Cell Handovers (Timer Expired)

A7: Call Drops Due to Loopback Start Failure

A8: Successful TCH Seizures on the TRX in the Underlaid Subcell, Successful TCH Seizures on the TRX in the OverLaid Subcell, Call Drops Due to Failures to Return to Normal Call from Loopback

A9: Successful Connections

Figure 3 Call drops in the intra-BSC handover procedure (including the signaling channel and TCH)

A1: Call Drops Due to ERR IND Received in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Overlaid Subcell in Stable State

A2: Call Drops Due to the CONN FAIL IND Received in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Overlaid Subcell in Stable State

A3: Call Drops Due to REL IND Received in Stable State, Call Drops Due to the REL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the REL IND Received on the TRX in the Overlaid Subcell in Stable State

A4: Call Drops Due to No MRs from MS for a Long Time, Call Drops Due to No MR from the MS on the TRX in the Underlaid Subcell, Call Drops Due to No MR from the MS on the TRX in the Overlaid Subcell, Call Drops due to Abis Terrestrial Link Failure, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Underlaid Subcell, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Overlaid Subcell, Call Drops Due to Abis Link Failures in Stable Loopback State, Call Drops Due to Equipment Failure, Call Drops Due to TRX Failure in the Underlaid Subcell, Call Drops Due to TRX Failure in the Overlaid Subcell, Call Drops due to Resource Check, Call Drops Due to Resource Check on the TRX in the Underlaid Subcell, Call Drops Due to Resource Check on the TRX in the Overlaid Subcell, Call Drops due to Other Causes Received in Stable State

A5: Clear Requests Sent on the A Interface, Call Drops after Answer, Call Drops After Answer on the TRX in the Underlaid Subcell, Call Drops After Answer on the TRX in the Overlaid Subcell

A6: Call Drops Due to Forced Handover, Call Drops Due to Forced Handover on the TRX in the Underlaid Subcell, Call Drops Due to Forced Handover on the TRX in the Overlaid Subcell, Failed Internal Intra-Cell Handovers (Timer Expired), Failed Outgoing Internal Inter-Cell Handovers (Timer Expired), Call Drops Due to Handover Failure During the Loopback

A7: Call Drops due to Failures to Return to Normal Call from Loopback

A8: Successful TCH Seizures on the TRX in the Underlaid Subcell, Successful TCH Seizures on the TRX in the OverLaid Subcell

A9: Successful Connections

A10: Successful SDCCH Seizures (Call Type)

Figure 4 Call drops in the outgoing BSC handover procedure (including the signaling channel and TCH)

A1: Call Drops Due to ERR IND Received in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Overlaid Subcell in Stable State

A2: Call Drops Due to the CONN FAIL IND Received in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Overlaid Subcell in Stable State

A3: Call Drops Due to REL IND Received in Stable State, Call Drops Due to the REL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the REL IND Received on the TRX in the Overlaid Subcell in Stable State

A4: Call Drops Due to No MRs from MS for a Long Time, Call Drops Due to No MR from the MS on the TRX in the Underlaid Subcell, Call Drops Due to No MR from the MS on the TRX in the Overlaid Subcell, Call Drops due to Abis Terrestrial Link Failure, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Underlaid Subcell, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Overlaid Subcell, Call Drops Due to Abis Link Failures in Stable Loopback State, Call Drops Due to Equipment Failure, Call Drops Due to TRX Failure in the Underlaid Subcell, Call Drops Due to TRX Failure in the Overlaid Subcell, Call Drops due to Resource Check, Call Drops Due to Resource Check on the TRX in the Underlaid Subcell, Call Drops Due to Resource Check on the TRX in the Overlaid Subcell, Call Drops due to Other Causes Received in Stable State

A5: Clear Requests Sent on the A Interface

A6: Call Drops Due to Forced Handover, Call Drops Due to Forced Handover on the TRX in the Underlaid Subcell, Call Drops Due to Forced Handover on the TRX in the Overlaid Subcell, Failed Outgoing External Inter-Cell Handovers (T8 Expired), Call Drops Due to Handover Failure During the Loopback

A9: Successful Connections

Figure 5 Call drops in the incoming BSC handover procedure (including the signaling channel and TCH)

A1: Call Drops Due to ERR IND Received in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the ERR IND Received on the TRX in the Overlaid Subcell in Stable State

A2: Call Drops Due to the CONN FAIL IND Received in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the CONN FAIL IND Received on the TRX in the Overlaid Subcell in Stable State

A3: Call Drops Due to REL IND Received in Stable State, Call Drops Due to the REL IND Received on the TRX in the Underlaid Subcell in Stable State, Call Drops Due to the REL IND Received on the TRX in the Overlaid Subcell in Stable State

A4: Call Drops Due to No MRs from MS for a Long Time, Call Drops Due to No MR from the MS on the TRX in the Underlaid Subcell, Call Drops Due to No MR from the MS on the TRX in the Overlaid Subcell, Call Drops due to Abis Terrestrial Link Failure, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Underlaid Subcell, Call Drops Due to Abis Terrestrial Link Failure on the TRX in the Overlaid Subcell, Call Drops Due to Abis Link Failures in Stable Loopback State, Call Drops Due to Equipment Failure, Call Drops Due to TRX Failure in the Underlaid Subcell, Call Drops Due to TRX Failure in the Overlaid Subcell, Call Drops due to Resource Check, Call Drops Due to Resource Check on the TRX in the Underlaid Subcell, Call Drops Due to Resource Check on the TRX in the Overlaid Subcell, Call Drops due to Other Causes Received in Stable State

A5: Clear Requests Sent on the A Interface

A6: Call Drops Due to Forced Handover, Call Drops Due to Forced Handover on the TRX in the Underlaid Subcell, Call Drops Due to Forced Handover on the TRX in the Overlaid Subcell, Failed incoming external inter-cell handovers (Timer expired), Call Drops Due to Handover Failure During the Loopback

A7: Call Drops due to Failures to Return to Normal Call from Loopback

A8: Successful TCH Seizures on the TRX in the Underlaid Subcell, Successful TCH Seizures on the TRX in the OverLaid Subcell

A9: Successful Connections

A10: Successful SDCCH Seizures (Call Type)

Formula

This is an original counter without involving any formula.