FAS measurement with presence of UMTS900

[esoestemp]

Hi all,

Can somebody help with suggestions which have to be FAS measurements of given GSM cell if it has collocated/and there are very close U900 cell, for the channels in that is located U900 band.

Thanks!

[s52d]

with FAS you measure uplink, not downlink.

So, measurements indicate uplink activity: I guess it is mostly lost in the noise or it is few dB higher.
But, it shall be simmilar over 3.84 (4.2) MHz.

BR
s52d

[esoestemp]

OK.
GSM UL band is 890-915Mhz and DL is 935-960MHz.
So if, for example, U900 uses the band 1-24 ARFCN.
What does that mean: is it located in the frequency band 890-895MHz, 935-940MHz or uses both?

[s52d]

It uses both. U900 is FDD like GSM.
But FAS can measure ulink only (measurements are done by TRX/TRU receivers on idle TS).
For DL, we use BAR in GSM: if you know uarfcnDl of U900, you can measure DL using BA list recording.

Now... My statement in previous message is valid if U900 and GSM are cosited; if not (you measure competitor)
you might receive higher uplink levels. Due to spreading of W-CDMA, you will see simmilar results on all GSM CH uplinks,
and level is proportional to uplink traffic.

Intersting but not much usefull. BAR might be more usefull in neighbor planning or interference detection.


BR
s52d

[esoestemp]

Hi s52d,

Could you clarify for which vendor is this "BAR" measurement in the DL?
For E******* I have not heard about that.