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Performance Measurement Counter InformationSystem

If the above mentioned relation is not fulfilled, a corresponding counter of NRFLTCH

is increased instead of UNIHIALC.

3. A handover of an HSCSD connection is considered as one single handover.

3.3.4 Intercell Handover Measurements

Intercell HOs are HOs from one cell to another cell, managed by the same BSC. The

handovers include TCH-TCH handovers, SDCCH-TCH handovers (i.e. directed retry)

and SDCCH-SDCCH handovers.

SDCCH-SDCCH HO is only initiated due to radio link quality reasons, no forced

SDCCH-SDCCH HO is supported.

3.3.4.1 ATINHIRC 30: Attempted Internal Handovers, Intercell, per Cause

Description:

This measurement gives the number of attempted handovers from the observed cell into

a different cell managed by the same BSC.

Different counters distinguish between the handover causes.

History:

In BR 5.5 a new counter is established which counts maintenance forced handover.

Trigger events:

receipt of a valid INTERCELL HANDOVER CONDITION INDICATION

(BTS -> BSC)

Results:

Counter sequence:

Parameter Object / Package Meaning

T10 PKG_BSCT supervises the receipt of anASSIGNMENT COMPLETE message

TTrau PKG_BTST supervises the datalink connection to theTRAU during connection establishment andhandover

Tsync PKG_BTST supervises the handling of TRAU frames

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GSM reference: ---

Latest modification: BR5.5

Measurement group: BTSMEAS

Measurement depth: per cell, per handover cause

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Number of counters: 8Counter type: integer

Unit: none

Counter no. Attempted internal intercell handovers with cause

1 uplink quality

2 downlink quality

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InformationSystem

Performance Measurement Counter

Notes:

1. INTERCELL HANDOVER CONDITION INDICATION messages with empty target

cell list are not counted

2. Only BSC controlled handover attempts are considered. Therefore the setting of the

following configuration parameter impacts the proper working of this measurement:

If thefirst targetcell in thehandover condition indication message is an external one,

the HO is considered as MSC-controlled. This applies even if the HO to the firs (ex-

ternal) cell is not possible and the second cell in the target cell list is an internal cell

and LOTERCH is set to true.

3. A handover of an HSCSD connection is considered as one single handover.

4. The counter maintenance forced handover counts

forced handovers due to O&M (i.e. due to shutdown of TRX or TCH objects.)

forced handovers due to preemption

3.3.4.2 SINTHINT 45: Successful Internal Handovers, Intercell, per Cause

Description:

This measurement gives the number of successful handovers from the observed cell

into a different cell managed by the same BSC.

Different counters distinguish between the handover causes.

History:

In BR 5.5 a new counter is established which counts maintenance forced handover.

Trigger events:

receipt of a valid HANDOVER COMPLETE (MS -> BSC)

Results:

3 uplink strength

4 downlink strength

5 distance

6 better cell (power budget related to the neighbourcell)

7 directed retry8 maintenance forced handover

Parameter Object / Package Meaning required value

LOTERCH HAND enables/disables TRUE

BSC controlled

intercell handovers

----------------------------------------------------------------------GSM reference: ---

Latest modification: BR5.5

Measurement group: BTSMEAS

Measurement depth: per cell, per handover cause

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Number of counters: 8

Counter type: integer

Unit: none