Tilt Strategy in case of UMTS900/GSM900

[rimoucha]

Hello Experts,

Is there any strategy to optimize tilt planning when having U900 and GSM 900 using the same antenna (common Tilt) in urban areas?

Best Regards,

[Handover24]

Unfortunatly I can not help you anyway documentation on this argument will be very helpfull :-)

[ventinel]

keep the same tilts

Hello Experts,

Is there any strategy to optimize tilt planning when having U900 and GSM 900 using the same antenna (common Tilt) in urban areas?

Best Regards,

[ching2-o]

even you play same tilts (electrical/mechanical) it will affect both since they are with the same antenna..better play parameter optimization if one of it was installed first and already optimized.

[captain_jejemon]

Hello Experts,

Is there any strategy to optimize tilt planning when having U900 and GSM 900 using the same antenna (common Tilt) in urban areas?

Best Regards,


Hi,

I suggest to focus on frequency plan rather than the tilt. you can also adjust TX power of U9 and G9.

[bawbag11]

From my experience you need to do 3 things:

1. Maintain G900 coverage at all costs, if not the customer will complain.
2. Deal with overshooting cells, tilt etc while trying not to affect point 1
3. Check for IM issues. Do remote PIM tests if your vendor kit will support it if not check pre/post U900 activation interference on GSM.

In all reality it is a big compromise, you will end up having to reduce some U900 CPICH if you cannot reduce overshooting. This still leaves interference from the max TX power of the cell if it is heavy loaded.

Much better to have separate antenna but the networks dont want the expense hence optimisation :)