Nokia Net Monitor description (DCT3)

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Test 41 – Inter-cell Handover Counters

Available in: 2100, 3330, 5110, 6150, 6210, 7110, 8210, 8250

Singleband (e.g. 5110)

Test screen	Help screen

This test displays the handover statistics.

HandOOK: Number of successful handovers. (?? Does include intras ??)

PrevCh: Number of successful returns to previous channel.

HONotOK: Number of failed handovers.

HOIntra: Number of successful intra-cell handovers.

The maximum value of these counters is 9999. When a counter reaches 9999, (?? All ??) counter will stop.

It can be seen that the single-band handover counters screen is less detailed than the dualband ones, i.e. there are no separate failed/back to previous statistics for Intra-cell and Inter-cell handovers.

These counters can be reset to 0 with “Test 40 – Reset Handover Counters” or “Test 60 – Reset Field Test Counters”.

Dualband (others)

Test screen	Help screen

This test displays statistics for inter-cell handovers, that is, handover during dedicated mode (call) between two different cells. The cells may be controlled by the same BSC, controlled by separate BSCs with the same MSC, or controlled by separate BSCs each attached to different MSCs (possibly even handover to a different network).

InterOK G>G: Number of successful inter-cell handovers within the GSM900 band

InterOK D>D: Number of successful inter-cell handovers from within the GSM1800 band

InterOK G>D: Number of successful inter-cell handovers from the GSM900 band (old cell) to the GSM1800 band (new cell)

InterOK D>G: Number of successful inter-cell handovers from the GSM1800 band (old cell) to the GSM900 band (new cell)

Maximum value of successful counters is 9999.

InterHOFail G>G: Number of failed inter-cell handovers from within the GSM900 band

InterHOFail D>D: Number of failed inter-cell handovers from within the GSM1800 band

InterHOFail G>D: Number of failed inter-cell handovers from the GSM900 band (old cell) to the GSM1800 band (intended new cell)

InterHOFail D>G: Number of failed inter-cell handovers from the GSM1800 band (old cell) to the GSM900 band (intended new cell)

Maximum value of failed counters is 999.

BackToPrev G>G: Number of successful inter-cell returns to previous channel from within the GSM900 band.

BackToPrev D>D: Number of successful inter-cell returns to previous channel from within the GSM1800 band.

BackToPrev G>D: Number of successful inter-cell returns to previous channel from the GSM900 band (old cell) to the GSM1800 band (new (original) cell)

BackToPrev D>G: Number of successful inter-cell returns to previous channel from the GSM1800 band (old cell) to the GSM900 band (new (original) cell)

The ‘return to previous’ handover is where the MS fails to connect on the new channel and re-establishes communication on the previous channel, hence maintaining the connection. Maximum value of return to previous channel counters is 999.

When one of the counters reaches the maximum value, the counters (all?) will stop.

These counters can give an indication of how much the phone is changing cell, often as a result of moving through the GSM network. It can also give an indication as to what bands the phone is using the most.

These counters can be reset to 0 with “Test 40 – Reset Handover Counters” or “Test 60 – Reset Field Test Counters”.

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