Measurement of Call Drops Due to ERR IND in Stable State

Measurement of Call Drops due to ERR IND in Stable StateMeasurement Counter

M3000A:CELL_CALL_DROPS_ERR_IND_T200_EXP_SD

M3000B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_SD

M3000C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_SD

M3400A:CELL_CALL_DROPS_ERR_IND_T200_EXP_TCHF_SIG

M3400B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_TCHF_SIG

M3400C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_TCHF_SIG

M3500A:CELL_CALL_DROPS_ERR_IND_T200_EXP_TCHH_SIG

M3500B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_TCHH_SIG

M3500C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_TCHH_SIG

M3100A:CELL_CALL_DROPS_ERR_IND_T200_EXP_TCHF_TRAF

M3100B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_TCHF_TRAF

M3100C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_TCHF_TRAF

M3200A:CELL_CALL_DROPS_ERR_IND_T200_EXP_TCHH_TRAF

M3200B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_TCHH_TRAF

M3200C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_TCHH_TRAF

M3610A:CELL_CALL_DROPS_ERR_IND_T200_EXP_SIG_ULCELL

M3610B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_SIG_ULCELL

M3610C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_SIG_ULCELL

M3310A:CELL_CALL_DROPS_ERR_IND_T200_EXP_TRAF_ULCELL

M3310B:CELL_CALL_DROPS_ERR_IND_UNSOLICITED_DM_RESP_TRAF_ULCELL

M3310C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_TRAF_ULCELL

M3620A:CELL_CALL_DROPS_ERR_IND_T200_EXP_SIG_OLCELL

M3620B:CELL_CALL_DROPS_ERR_IND_UNSOLCELLICITED_DM_RESP_SIG_OLCELL

M3620C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_SIG_OLCELL

M3320A:CELL_CALL_DROPS_ERR_IND_T200_EXP_TRAF_OLCELL

M3320B:CELL_CALL_DROPS_ERR_IND_UNSOLCELLICITED_DM_RESP_TRAF_OLCELL

M3320C:CELL_CALL_DROPS_ERR_IND_SEQ_ERR_TRAF_OLCELL

Description

After the MS seizes a channel, the BTS sends the BSC an ERR IND 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 ERR IND message is timer T200 expired (N200+1) times (0x01), unsolicited DM response (0x04), or sequence error (0x07), this measurement provides the number of call drops due to ERR 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

None.

Measurement Point

The specific counter is incremented by one when the BSC receives an ERR IND message. The counter is measured at A1, 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



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)




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


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



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






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


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






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





Formula

None.

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Call Drops on Signaling Channel in Stable State (Error Indication)Measurement Counter

CM3600: CELL_SIG_STATIC_STATE_CALL_DROPS_ERR_IND

Description

After the MS seizes a channel, the BTS sends the BSC an ERR IND message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer.

This measurement provides the number of times that the BSC receives an ERR IND message on the signaling channel for releasing a call. During a call, if multiple ERR IND messages, or a REL IND message or CONN FAIL IND message is received by the BSC after an ERR IND message, this counter is measured only once.

Unit

None.

Measurement Point

When an SDCCH or a TCH is seized as a signaling channel during a call, this counter is incremented by one if the BSC receives an ERR IND message.

This counter is calculated at A1, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5.















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)








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 in Stable State






















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





Formula

Call Drops on Signaling Channel in Stable State (Error Indication) =

[Call Drops due to ERR IND Received on SDCCH in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on SDCCH in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on SDCCH in Stable State (Sequence Error)] +

[Call Drops due to ERR IND Received on TCHF (Signaling Channel) in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on TCHF (Signaling Channel) in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on TCHF (Signaling Channel) in Stable State (Sequence Error)] +

[Call Drops due to ERR IND Received on TCHH (Signaling Channel) in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on TCHH (Signaling Channel) in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on TCHH (Signaling Channel) in Stable State (Sequence Error)]


Call Drops on TCH in Stable State (Error Indication)Measurement Counter

CM3300:CELL_TRAF_CH_STATIC_STATE_CALL_DROPS_ERR_IND

Description

After the MS seizes a channel, the BTS sends the BSC an ERR IND message, indicating that a call drop occurs on the Um interface because of the abnormal connection on the radio link layer.

This measurement provides the number of times that the BSC receives an ERR IND message on the traffic channel for releasing a call. During a call, if multiple ERR IND messages are received, or if a REL IND or CONN FAIL IND message is received after an ERR IND message, this counter is measured only once.

Unit

None.

Measurement Point

When a TCH is seized to carry traffic, this counter is measured when the BSC receives an ERR IND message.

This counter is calculated at A1, as shown in Figure 1, Figure 2, Figure 3,and Figure 4.





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




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






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 in Stable State













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













Formula

Call Drops on Traffic Channel in Stable State (Error Indication) =

[Call Drops due to ERR IND Received on TCHF (Traffic Channel) in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on TCHF (Traffic Channel) in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on TCHF (Traffic Channel) in Stable State (Sequence Error)] +

[Call Drops due to ERR IND Received on TCHH (Traffic Channel) in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on TCHH (Traffic Channel) in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on TCHH (Traffic Channel) in Stable State (Sequence Error)]


Measurement of Call Drops due to Connection Failure in Stable StateMeasurement 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

None.

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.













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




































Formula

None.


Call Drops on Signaling Channel in Stable State (Connection Failure)Measurement Counter

CM3601:CELL_SIG_STATIC_STATE_CALL_DROPS_CONN_FAIL

Description

After the MS seizes a channel, the BTS sends the BSC a CONN FAIL IND message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer.

This measurement provides the number of times that the BSC receives a CONN FAIL IND message on the signaling channel for releasing a call. During a call, if multiple CONN FAIL IND messages, or a REL IND message or an ERR IND message is received after a CONN FAIL IND message is received by the BSC, this counter is measured only once.

Unit

None.

Measurement Point

When an SDCCH or a TCH is seized to carry signaling during a call, this counter is incremented by one if the BSC receives a CONN FAIL IND message.


















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


































Formula

Call Drops on Signaling Channel in Stable State (Connection Failure) =

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (Other Causes)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (Other Causes)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (Other Causes)]


Call Drops on TCH in Stable State (Connection Failure)Measurement Counter

CM3301:CELL_TRAF_CH_STATIC_STATE_CALL_DROPS_CONN_FAIL

Description

After the MS seizes a channel, the BTS sends the BSC a CONN FAIL IND message, indicating that a call drop occurs on the Um interface because of the abnormal connection on the radio link layer.

This measurement provides the number of times that the BSC receives a CONN FAIL IND message on the traffic channel for releasing a call. During a call, if multiple CONN FAIL IND messages are received, or if a REL IND or ERR IND message is received after a CONN FAIL IND message, this counter is measured only once.

Unit

None.

Measurement Point

When a TCH is seized to carry traffic during a call, this counter is measured when the BSC receives a CONN FAIL IND message.

This counter is calculated at A2, as shown in Figure 1, Figure 2, Figure 3,and Figure 4.








Failed Internal Intra-Cell Handovers (Timer Expired)


































Formula

Call Drops on Traffic Channel in Stable State (Connection Failure) =

[Call Drops due to CONN FAIL Received on TCHF (Traffic Channel) in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on TCHF (Traffic Channel) in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on TCHF (Traffic Channel) in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on TCHF (Traffic Channel) in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on TCHF (Traffic Channel) in Stable State (Other Causes)] +

[Call Drops due to CONN FAIL Received on TCHH (Traffic Channel) in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on TCHH (Traffic Channel) in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on TCHH (Traffic Channel) in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on TCHH (Traffic Channel) in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on TCHH (Traffic Channel) in Stable State (Other Causes)]


Measurement of Call Drops due to REL IND in Stable StateMeasurement Counter

M3002:CELL_CALL_DROPS_REL_IND_SD

M3402:CELL_CALL_DROPS_REL_IND_TCHF_SIG

M3102:CELL_CALL_DROPS_REL_IND_TCHF_TRAF

M3502:CELL_CALL_DROPS_REL_IND_TCHH_SIG

M3202:CELL_CALL_DROPS_REL_IND_TCHH_TRAF

M3612A:CELL_CALL_DROPS_REL_IND_SIG_ULCELL

M3312B:CELL_CALL_DROPS_REL_IND_TRAF_ULCELL

M3622A:CELL_CALL_DROPS_REL_IND_SIG_OLCELL

M3322B:CELL_CALL_DROPS_REL_IND_TRAF_OLCELL

Description

The connection between the MS and the BTS fails. Therefore, when the BTS in the multi-frame link set-up state receives the DISC frame from the MS, the BTS sends the BSC an RELIND message indicating that call drops occur on the Um interface. This measurement provides the number of call drops related to REL IND based on the channel type (SDCCH, TCHF, or TCHH), the service type (signaling or traffic), and the concentric attribute (overlaid subcell or underlaid subcell).

Unit

None.

Measurement Point

The specific counter is incremented by one when the BSC receives an REL IND message.






















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
























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





Formula

None.


Call Drops on Signaling Channel in Stable State (Release Indication)Measurement Counter

CM3602:CELL_SIG_STATIC_STATE_CALL_DROPS_REL_IND

Description

After the MS seizes a channel, the BTS sends the BSC a REL IND message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer.

This measurement provides the number of times that the BSC receives a REL IND message on the signaling channel for releasing a call. During a call, if an ERR IND or CONN FAIL IND message is received after a REL IND message, this counter is measured only once.

Unit

None.

Measurement Point

When an SDCCH or a TCH is seized to carry signaling during a call, this counter is incremented by one if the BSC receives a REL IND message.















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

























Failed Outgoing External Inter-Cell Handovers (T8 Expired), Call Drops Due to Handover Failure During the Loopback













Formula

Call Drops on Signaling Channel in Stable State (Release Indication) =

[Call Drops due to REL IND Received on SDCCH] +

[Call Drops due to REL IND Received on TCHF (Signaling Channel)] +

[Call Drops due to REL IND Received on TCHH (Signaling Channel)]


Call Drops on Signaling Channel in Stable State (Error Indication) (TCH)Measurement Counter

CM3603 :CELL_SIG_CHAN_STATIC_STATE_CALL_DROP_TIMES_TCH_ERR_IND

Description

After the MS seizes a channel, the BTS sends the BSC an ERR IND message, indicating that a call drop occurs on the Um interface because of the abnormal connection on the radio link layer.

This measurement provides the number of times that the BSC receives the ERR IND messages and releases calls after the MS seizes the TCH for carrying signaling. During a call, if multiple ERR IND messages are received, or a REL IND or CONN FAIL IND message is received after an ERR IND message, this counter is measured only once.

Unit

None.

Measurement Point

When a TCH is seized to carry signaling during a call, this counter is measured when the BSC receives an ERR IND message.




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 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 Received on the TRX in the Overlaid Subcell in Stable State








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






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





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








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

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










Formula

Call Drops on Signaling Channel in Stable State (Error Indication) (TCH) =

[Call Drops due to ERR IND Received on TCHF (Signaling Channel) in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on TCHF (Signaling Channel) in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on TCHF (Signaling Channel) in Stable State (Sequence Error)] +

[Call Drops due to ERR IND Received on TCHH (Signaling Channel) in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on TCHH (Signaling Channel) in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on TCHH (Signaling Channel) in Stable State (Sequence Error)]


Call Drops on Signaling Channel in Stable State (Release Indication) (TCH)Measurement Counter

CM3604:CELL_SIG_CHAN_STATIC_STATE_CALL_DROP_TIMES_TCH_REL_IND

Description

After the MS seizes a channel, the BTS sends the BSC an REL IND message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer.

This measurement provides the number of times that the BSC receives an REL IND message and releases the call after the MS seizes the TCH for the signaling services. This counter is incremented by one when the BSC receives an REL IND message during a call, irrespective of whether a CONN FAIL IND message or an ERR IND message is received afterwards.

Unit

None.

Measurement Point

When a TCH is seized as a signaling channel during a call, this counter is incremented by one if the BSC receives an REL IND message.














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

























Formula

Call Drops on Signaling Channel in Stable State (Release Indication) (TCH) =

[Call Drops due to REL IND Received on TCHF (Signaling Channel)] +

[Call Drops due to REL IND Received on TCHH (Signaling Channel)]


Call Drops on Signaling Channel in Stable State (Connection Failure) (TCH)Measurement Counter

CM3605:CELL_SIG_CHAN_STATIC_STATE_CALL_DROP_TIMES_TCH_CONN_FAIL

Description

After the MS seizes a channel, the BTS sends the BSC a CONN FAIL IND message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer.

This measurement provides the number of times that the BSC receives a CONN FAIL IND message for releasing a call after the MS seizes a TCH for signaling services. During a call, if multiple CONN FAIL IND messages are received, or if a REL IND or ERR IND message is received after a CONN FAIL IND message, this counter is measured only once.

Unit

None.

Measurement Point

When a TCH is seized as a signaling channel during a call, this counter is incremented by one if the BSC receives a CONN FAIL IND message.





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























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

the TRX in the OverLaid Subcell























Formula

Call Drops on Signaling Channel in Stable State (Connection Failure) (TCH) =

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on TCHF (Signaling Channel) in Stable State (Other Causes)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on TCHH (Signaling Channel) in Stable State (Other Causes)]


Call Drops on Radio Interface in Stable State (TCH Qua Signaling Channel)Measurement Counter

CM3606:CELL_SIG_CHAN_STATIC_STATE_CALL_TCH_DROP_TIMES

Description

This measurement provides the number of calls released because of the ERR IND, CONN FAIL IND, and REL IND messages received by the BSC.

The MS seizes a signaling channel in any of the following conditions:

1. In the immediate assignment procedure, the BTS sends an EST IND message to the BSC.

2. The MS sends an HO CMP message to the BSC, and the MS seizures a signaling channel.

Unit

None.

Measurement Point

If the signaling is processed for the call and if a TCH is seized, this counter is measured in any of the following situations:

1. The BSC receives an ERROR INDICATION message from the BTS because of the abnormal connection on the radio link layer. For details, refer to GSM Rec. 08.58.

2. The BSC receives a CONNECTION FAILURE INDICATION message from the BTS because of link fault or hardware fault on the radio link layer. For details, refer to GSM Rec. 08.58.

3. When receiving a DISC frame on a link layer connection in multi-frame mode, the BTS sends a REL IND message to BSC. For details, refer to GSM Rec. 08.58.

This counter is calculated at A1, A2, and A3, as shown in Figure 1.









Formula

Call Drops on Radio Interface in Stable State (TCH Qua Signaling Channel) =

[Call Drops on Signaling Channel in Stable State (Error Indication) (TCH)] +

[Call Drops on Signaling Channel in Stable State (Connection Failure) (TCH)] +

[Call Drops on Signaling Channel in Stable State (Release Indication) (TCH)]


Call Drops on Traffic Channel in Stable State (Release Indication)Measurement Counter

CM3302: CELL_TRAF_CH_STATIC_STATE_CALL_DROPS_REL_IND

Description

After the MS seizes a channel, the BTS sends the BSC a REL IND message, indicating that call drops occur on the Um interface because of the abnormal connection at the radio link layer.

This measurement provides the number of times that the BSC receives a REL IND message on the traffic channel for releasing a call. During a call, if an ERR IND or CONN FAIL IND message is received after a REL IND message, this counter is measured only once.

Unit

None.

Measurement Point

When a TCH is seized to carry traffic during a call, this counter is incremented by one if the BSC receives a REL IND message.

This counter is calculated at A3, as shown in Figure 1, Figure 2, Figure 3, and Figure 4.


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



























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 in Stable State















Formula

Call Drops on Traffic Channel in Stable State (Release Indication) =

[Call Drops due to REL IND Received on TCHF (Traffic Channel)] +

[Call Drops due to REL IND Received on TCHH (Traffic Channel)]


Measurement of Call Drops Due to No MRs from MS for a Long TimeMeasurement Counter

M302:CELL_CALL_DROPS_NO_MR_SD

M342:CELL_CALL_DROPS_NO_MR_TCHF_SIG

M312:CELL_CALL_DROPS_NO_MR_TCHF_TRAF

M352:CELL_CALL_DROPS_NO_MR_TCHH_SIG

M322:CELL_CALL_DROPS_NO_MR_TCHH_TRAF

M3613A:CELL_CALL_DROPS_NO_MR_SIG_ULCELL

M3313B:CELL_CALL_DROPS_NO_MR_TRAF_ULCELL

M3623A:CELL_CALL_DROPS_NO_MR_SIG_OLCELL

M3323B:CELL_CALL_DROPS_NO_MR_TRAF_OLCELL

Description

After seizing an SDCCH, the MS reports a measurement report to the BSC every 470 ms. After seizing a TCH, the MS reports a measurement report to the BSC every 480 ms. If the BSC does not receive a measurement report within a certain period (five minutes by default), the BSC determines that a call drop occurs on the Um interface. This measurement provides the number of call drops due to no MRs on the basis of the channel type (SDCCH, TCHF, or TCHH), the service type (signaling or traffic), and the concentric attribute (overlaid subcell or underlaid subcell).

Unit

None.

Measurement Point

When the BSC does not receive a measurement report within a certain period of time (five minutes, by default), the BSC sends a CLEAR REQUEST message to the MSC to release the call, and the specific counter is incremented by one.

The specific counter is measured at A4, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5.
































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










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 in Stable State







Formula

None.


Call Drops due to No MRs from MS for a Long Time (Signaling Channe)Measurement Counter

CM362:CELL_SIG_CALL_DROPS_NO_MR

Description

After seizing the SDCCH, the MS reports a measurement report to the BSC every 470 ms. After seizing the TCH, the MS reports a measurement report to the BSC every 480 ms. If the BSC does not receive a measurement report within a certain period (five minutes by default), the BSC determines that a call drop occurs on the Um interface.

This measurement provides the number of call releases by the BSC because the BSC does not receive any measurement report on the signaling channel within a certain period.

Unit

None.

Measurement Point

When an SDCCH or a TCH is seized to carry signaling during a call, if the BSC does not receive a measurement report within a certain period (by default, five minutes), then the BSC sends a CLEAR COMMAND message to the MSC to release the call. This counter is measured when the BSC sends a CLEAR COMMAND message to the MSC.



































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 in Stable State















Formula

Call Drops due to No MRs from MS for a Long Time (Signaling Channel) = [Call Drops due to No MRs from MS for a Long Time (SDCCH)] + [Call Drops due to No MRs from MS for a Long Time (TCHF) (Signaling Channel)] + [Call Drops due to No MRs from MS for a Long Time (TCHH) (Signaling Channel)]


Call Drops due to No MRs from MS for a Long Time (Traffic Channel)Measurement Counter

CM332:CELL_TRAF_CH_CALL_DROPS_NO_MR

Description

After seizing an SDCCH, the MS sends a measurement report to the BSC every 470 ms. After seizing a TCH, the MS sends a measurement report to the BSC every 480 ms. If the BSC does not receive any measurement report within a certain period (five minutes, by default), it deems that a call drop occurs on the Um interface.

This measurement provides the number of call releases by the BSC because the BSC does not receive any measurement report on the traffic channel within a certain period.

Unit

None.

Measurement Point

This counter is incremented by one when the BSC does not receive any measurement report within a certain period (by default, five minutes) on the TCH seized by the MS and sends a CLEAR COMMAND message to the MSC to release the call.











































Formula

Call Drops due to No MRs from MS for a Long Time (Traffic Channel) =

[Call Drops due to No MRs from MS for a Long Time (TCHF) (Traffic Channel)] +

[Call Drops due to No MRs from MS for a Long Time (TCHH) (Traffic Channel)]


Measurement of Call Drops Due to Abis Terrestrial Link FailureMeasurement Counter

M303:CELL_CALL_DROPS_ABIS_LNK_FAIL_SD

M343:CELL_CALL_DROPS_ABIS_LNK_FAIL_TCHF_SIG

M313:CELL_CALL_DROPS_ABIS_LNK_FAIL_TCHF_TRAF

M353:CELL_CALL_DROPS_ABIS_LNK_FAIL_TCHH_SIG

M323:CELL_CALL_DROPS_ABIS_LNK_FAIL_TCHH_TRAF

M3613C:CELL_CALL_DROPS_ABIS_LNK_FAIL_SIG_ULCELL

M3313D:CELL_CALL_DROPS_ABIS_LNK_FAIL_TRAF_ULCELL

M3623C:CELL_CALL_DROPS_ABIS_LNK_FAIL_SIG_OLCELL

M3323D:CELL_CALL_DROPS_ABIS_LNK_FAIL_TRAF_OLCELL

Description

After the MS seizes a channel, the call may be released because the RSL of the TRX carrying the channel is broken. Then, this measurement provides the number of call drops due to Abis terrestrial link failure on the basis of the channel type (SDCCH, TCHF, or TCHH), the service type (signaling or traffic), and the concentric attribute (overlaid subcell or underlaid subcell).

Unit

None.

Measurement Point

When the BSC detects a broken RSL, the BSC releases all the calls on the link and the specific counter is incremented by one.

The specific counter is measured at A4, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5.



















































Formula

None.


Call Drops Due to Abis Terrestrial Link Failure (Signaling Channel)Measurement Counter

CM363:CELL_SIG_CALL_DROPS_ABIS_LNK_FAIL

Description

After the MS seizes a channel, the BSC releases the call if the terrestrial link of the Abis interface seized by the call fails.

This measurement provides the number of call releases by the BSC due to the terrestrial link failure over the Abis interface on the signaling channel.

Unit

None.

Measurement Point

When an SDCCH or a TCH is seized to carry signaling during a call, this counter is measured if the BSC detects a broken RSL and releases all the calls on the link.




































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 in Stable State















Formula

Call Drops Due to Abis Terrestrial Link Failure (Signaling Channel) = [Call Drops due to Abis Terrestrial Link Failure (SDCCH)] + [Call Drops due to Abis Terrestrial Link Failure (TCHF) (Signaling Channel)] + [Call Drops due to Abis Terrestrial Link Failure (TCHH) (Signaling Channel)]


Call Drops due to Abis Terrestrial Link Failure (Traffic Channel)Measurement Counter

CM333:CELL_TRAF_CH_CALL_DROPS_ABIS_LNK_FAIL

Description

If the terrestrial link on the Abis interface seized by the call fails after the MS seizes a channel, the BSC releases the call.

This measurement provides the number of call releases by the BSC due to the terrestrial link failure over the Abis interface on the traffic channel.

Unit

None.

Measurement Point

When a TCH is seized to carry traffic during a call, this counter is measured if the BSC detects a broken RSL and releases all the calls on the link.







































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





Formula

Call Drops due to Abis Terrestrial Link Failure (Traffic Channel) =

[Call Drops due to Abis Terrestrial Link Failure (TCHF) (Traffic Channel)] +

[Call Drops due to Abis Terrestrial Link Failure (TCHH) (Traffic Channel)]


Call Drops due to Abis Link Failures in Stable Loopback StateMeasurement Counter

M3330A: CELL_CALL_DROPS_BTS_ABIS_CIRCUIT_FAULT

Description

After dynamic allocation of Abis resources is enabled on the BSC and the MS seizes a traffic channel, the BSC assigns the Abis terrestrial link to the MS and sends a message to the BTS for setting up an Abis link. After the MS seizes the traffic channel, this measurement provides the number of times that a call is released because the Abis link between the BSC and the BTS is disconnected.

Unit

None.

Measurement Point

After the MS seizes the traffic channel, this counter is incremented by one when the Abis link between the BSC and the BTS is disconnected.

This counter is measured at A4, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5.

























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


























Formula

None.


Measurement of Call Drops Due to Equipment FailureMeasurement Counter

M304:CELL_CALL_DROPS_EQUIP_FAIL_SD

M344:CELL_CALL_DROPS_EQUIP_FAIL_TCHF_SIG

M314:CELL_CALL_DROPS_EQUIP_FAIL_TCHF_TRAF

M354:CELL_CALL_DROPS_EQUIP_FAIL_TCHH_SIG

M324:CELL_CALL_DROPS_EQUIP_FAIL_TCHH_TRAF

M3613E:CELL_CALL_DROPS_EQUIP_FAIL_SIG_ULCELL

M3313F:CELL_CALL_DROPS_EQUIP_FAIL_TRAF_ULCELL

M3623E:CELL_CALL_DROPS_EQUIP_FAIL_SIG_OLCELL

M3323F:CELL_CALL_DROPS_EQUIP_FAIL_TRAF_OLCELL

Description

After the MS seizes a channel, the call may be released because of the internal error of the BSC. Then, this measurement provides the number of call drops due to equipment failure on the basis of the channel type (SDCCH, TCHF, or TCHH), the service type (signaling or traffic), and the concentric attribute (overlaid subcell or underlaid subcell).

Unit

None.

Measurement Point

This counter is measured in the following situations, on the basis of channel type, service type, and concentric attribute.

A call drop occurs because of any of the following: TRX mutual aid; dynamic modification of cell attributes, TRX frequencies, or TRX FH data; dynamic deletion of cells or TRXs; blocking of cells, TRXs, or channels.

The timer set to wait for the outgoing BSC handover command expires, or the clear request message is received from the MSC before the timer expires, and the handover cause is other causes than OM intervention, MSC triggering, or preemption.

A call drop occurs because of call assignment failure during the handover. The MSC cannot send a short message because of the restriction on sending downlink

short messages in data configuration or because of flow control, and then the call is released.

A call drop occurs because of software error.




















































Formula

None.


Call Drops due to Equipment Failure (Signaling Channel)Measurement Counter

CM364:CELL_SIG_CALL_DROPS_EQUIP_FAIL

Description

After the MS seizes a channel, if the status of the BSC internal resources is abnormal, the BSC releases the call that seizes the abnormal resources.

This measurement provides the number of call releases by the BSC on the signaling channel due to the abnormal state of internal resources.

Unit

None.

Measurement Point

When an SDCCH or a TCH is seized to carry signaling during a call, this counter is measured in the following situations:









































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 in Stable State










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





Formula

Call Drops due to Equipment Failure (Signaling Channel) = [Call Drops Due to Equipment Failure (SDCCH)] + [Call Drops due to Equipment Failure (TCHF) (Signaling Channel)] + [Call Drops due to Equipment Failure (TCHH) (Signaling Channel)]


Call Drops due to Equipment Failure (Traffic Channel)Measurement Counter

CM334:CELL_TRAF_CH_CALL_DROPS_EQUIP_FAIL

Description

After the MS seizes a channel, if the status of the BSC internal resources is abnormal, the BSC releases the call that seizes the abnormal resources.

This measurement provides the number of call releases by the BSC on the traffic channel due to an abnormal internal resource status.

Unit

None.

Measurement Point

When a TCH is seized to carry traffic during a call, this counter is measured in the following situations:
















































Formula

Call Drops due to Equipment Failure (Traffic Channel) =

[Call Drops due to Equipment Failure (TCHF) (Traffic Channel)] +

[Call Drops due to Equipment Failure (TCHH) (Traffic Channel)]


Call Drops on Radio Interface in Stable State (Traffic Channel)Measurement Counter

CM330:CELL_TRAF_CH_CALL_DROPS_IN_STABLE_STATE

Description

This measurement provides the number of calls released because of the ERR IND, CONN FAIL IND, and REL IND messages received by the BSC after the MS seizes a traffic channel.

Unit

None.

Measurement Point


1. The BSC receives an ERROR INDICATION message from the BTS because of the abnormal connection on the radio link layer. For details, refer to GSM Rec. 08.58.

2. The BSC receives a CONNECTION FAILURE INDICATION message from the BTS because of link fault or hardware fault on the radio link layer. For details, refer to GSM Rec. 08.58.

3. When receiving a DISC frame on a link layer connection in multi-frame mode, the BTS sends a REL IND message to BSC. For details, refer to GSM Rec. 08.58.

This counter is calculated at A1, A2, and A3, as shown in Figure 1.




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







Formula

Call Drops on Radio Interface in Stable State (Traffic Channel) =

[Call Drops on TCH in Stable State (Error Indication)] +

[Call Drops on TCH in Stable State (Connection Failure)] +

[Call Drops on Traffic Channel in Stable State (Release Indication)]

Call Drops on Radio Interface in Handover State (Traffic Channel)Measurement Counter

CM331:CELL_TRAF_CH_CALL_DROPS_HO_FAIL

Description

After the MS seizes the TCH, the BSC sends the HO CMD to the MS. During the handover process, this measurement provides the number of times that the timer for the target cell waiting for the handover completion expires if the MS fails to access the new channel at the radio interface, or the number of times when the timer for the originating cell waiting for the handover completion expires if the MS fails to return to the original channel.

Unit

None.

Measurement Point


1. The timer set to wait for an HO CMP message expires during internal intra-cell handover.

2. The timer set to wait for an HO CMP message expires during outgoing internal inter-cell handover.

3. The timer set to wait for an HO CMP message expires during outgoing external inter-cell handover.

This counter is calculated at A1, A2, and A3, as shown in Figure 1 and Figure 2.






















Formula

Call Drops on Radio Interface in Handover State (Traffic Channel) =

[Failed Internal Intra-Cell Handovers (Timer Expired) (TCHF) (Traffic Channel)] +

[Failed Internal Intra-Cell Handovers (Timer Expired) (TCHH) (Traffic Channel)] +

[Failed Outgoing Internal Inter-Cell Handovers (Timer Expired) (TCHF) (Traffic Channel)] +

[Failed Outgoing Internal Inter-Cell Handovers (Timer Expired) (TCHH) (Traffic Channel)] +

[Failed Outgoing External Inter-Cell Handovers (T8 Expired) (TCHF) (Traffic Channel)] +

[Failed Outgoing External Inter-Cell Handovers (T8 Expired) (TCHH) (Traffic Channel)] +

Call Drops on Radio Interface (Traffic Channel)Measurement Counter

CM33C:CELL_TRAF_CH_UM_CALL_DROPS

Description

This measurement provides the number of call releases due to connection failure on the radio interface caused by various reasons after the MS seizes a traffic channel.

Note: the call can be in stable or handover mode.

Unit

None.

Measurement Point


1. The BSC receives an ERROR INDICATION message from the BTS because of the abnormal connection at the radio link layer. For details, refer to GSM Rec. 08.58.

2. The BSC receives a CONNECTION FAILURE INDICATION message from the BTS because of link fault or hardware fault at the radio link layer. For details, refer to GSM Rec. 08.58.

3. The BSC receives a REL IND message from the BTS. Previously, the BTS has received a DISC frame from the MS in the multi-frame link set-up state. For details, refer to GSM Rec. 08.58.




7. The timer set to wait for an HO CMP message expires during incoming external inter-cell handover.

This counter is calculated at A1, A2, and A3, as shown in Figure 1, Figure 2, Figure 3, and Figure 4.





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




































Formula

Call Drops on Radio Interface (Traffic Channel) = [Call Drops on Radio Interface in Stable State (Traffic Channel)] + [Call Drops on Radio Interface in Handover State (Traffic Channel)]

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Call Drops on Traffic Channel Measurement Counter

CM33:CELL_TRAF_CH_CALL_DROPS

Description

This measurement provides the number of call drops due to various reasons after the MS seizes a traffic channel.

The MS seizures a TCH in any of the following conditions:

The MS sends an ASS CMP message to the BSC;

The MS seizes a TCH and sends an HO CMP message to the BSC.

Unit

None.

Measurement Point



2. The BSC receives a CONNECTION FAILURE INDICATION message from the BTS because of the radio link fault or hardware fault. For details, refer to GSM Rec. 08.58.

3. When receiving a DISC frame on a link layer connection in multi-frame mode, the BTS sends a REL IND message to the BSC. For details, refer to GSM Rec. 08.58.





8. The BSC does not receive any measurement report within a certain period (by default, five minutes) and sends a CLEAR COMMAND message to the MSC to release the call.

9. The BSC detects a broken RSL and releases all the calls on the RSL.

10. A call drop occurs due to any of the following situations: TRX mutual aid; dynamic modification of cell attributes, TRX frequencies, or TRX FH data; dynamic deletion of cells or TRXs; blocking of cells, TRXs, or channels.

11. The timer set to wait for the outgoing BSC handover command expires, or the clear request message is received from the MSC before the timer expires.

12. A call drop occurs due to call assignment failure during the handover.

13. The MSC cannot send a short message because the data configuration prohibits the downlink short messages or because of flow control and the call is released.

14. A call drop occurs due to software error.

15. After seizing a channel, the MS fails to start a local switching due to terrestrial resource request failure, failures on the BTS side, or timer expiration.

16. After a call is in the BSC or BTS local switching state, if the local switching cannot be proceeded for handover or other reasons, the BSC restores the call to the common call state. If the restoration fails due to terrestrial resource request failure or other reasons, the BSC releases the call.

This counter is calculated at A1, A2, A3, and A4, as shown in Figure 1, Figure 2, Figure 3, and Figure 4.















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 in Stable State


























Formula

Call Drops on Traffic Channel =

[Call Drops on Radio Interface in Stable State (Traffic Channel)] +

[Call Drops on Radio Interface in Handover State (Traffic Channel)] +

[Call Drops due to No MRs from MS for a Long Time (Traffic Channel)] +

[Call Drops due to Abis Terrestrial Link Failure (Traffic Channel)] +

[Call Drops due to Equipment Failure (Traffic Channel)] +

[Call Drops due to Forced Handover (Traffic Channel)] +

[Call Drops Due to Loopback Start Failure] +

[Call Drops Due to Failures to Return to Normal Call from Loopback ]


Call Drops on Radio Interface (SDCCH)Measurement Counter

CM30A:CELL_SD_UM_CALL_DROPS

Description

This measurement provides the number of call releases that occur on the radio interface due to various reasons after the MS seizes the SDCCH.

Unit

None.

Measurement Point

When an SDCCH is seized during a call, this counter is measured in the following situations:


2. The BSC receives a CONNECTION FAILURE INDICATION message from the BTS because of link fault or hardware fault at the radio link layer. For details, refer to GSM Rec. 08.58.

3. When receiving a DISC frame on a link layer connection in multi-frame mode, the BTS sends a REL IND message to the BSC. For details, refer to GSM Rec. 08.58.





This counter is calculated at A1, A2, and A3, as shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5.



















































Formula

Call Drops on Radio Interface (SDCCH) =

[Call Drops due to ERR IND Received on SDCCH in Stable State (T200 Expired)] +

[Call Drops due to ERR IND Received on SDCCH in Stable State (Unsolicited DM Response)] +

[Call Drops due to ERR IND Received on SDCCH in Stable State (Sequence Error)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (Radio Link Failure)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (HO Access Failure)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (OM Intervention)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (Radio Resource Unavailable)] +

[Call Drops due to CONN FAIL Received on SDCCH in Stable State (Other Causes)] +

[Call Drops due to REL IND Received on SDCCH] +

[Failed Internal Intra-Cell Handovers (Timer Expired) (SDCCH)] +

[Failed Outgoing Internal Inter-Cell Handovers (Timer Expired) (SDCCH) (Excluding Directed Retry)] +

[Failed Outgoing Internal Inter-Cell Handovers (Timer Expired) (Directed Retry)] +

[Failed Outgoing External Inter-Cell Handovers (T8 Expiry) (SDCCH) (Excluding Directed Retry)] +

[Failed Outgoing External Inter-Cell Handovers (T8 Expired) (Directed Retry)] +

[Failed incoming external inter-cell handovers (Timer expired) (SDCCH)]


Measurement of Call Drops Due to ERR IND in Stable State

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