 This topic has 15 replies, 1 voice, and was last updated 8 years, 10 months ago by Fahad.

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razaGuest
can anyone tell me why the rxlev is in negative?
And if suppose rxlev is 60 dbm then do we address it as high rxlev or low rxlev.
RexGuestHi,
Negative value cause it’s less then 1 mW.BaigGuestAs far as i know about this, it is not due to absolute value of power. actually the rxlevel is calculated with referece to RSSI(Recieve Signal Strength Indicator). RSSI is a vendor based parameter. RxLevel in turn is calculated through manipulation of it. couldn’t find the exact formulation though.please share if anybody knows
PixGuestHi all,
RxLev is a measurement of absolute power.
If RxLev = 0 dBm it means the received level is 1mW
if Rxlev = 3dBm –> 0.5mW
RxLev = 6dBm –> 0.25mW
RxLev = 9dBm –> 0.125 mW
12dBm –> 0.0625 mWand so on.
a MS has a measurement range from 47dBm to 110dBm.
47dBm : high received power
110dBm : low received powerbut the MS can hear stronger than 47dBm, it just can’t report a measurement higher than 47dBm.
RSSI is a coded value representing the RxLev. It is very simple :
110dBm –> RSSI = 0
109dBm –> RSSI = 1
100dBm –> RSSI = 10
90dBm –> RSSI = 20
80dBm –> RSSI = 30
…Cheers,
PixBaigGuestThanx for the correction Pix
What measurement would you get if the level is less than 47. I’ve also found level less than 47 on TEMS.
pixGuesthi,
tems is not standard ms, it can display a wider range of values. however, it can report only within the 47 to 110 dBm (in the meas report, sent to bts/bsc)
if rxlev higher than 47 then the value 47 is used.
if lower than 110dBm then 110dBm is used 🙂cheers
pix (writing with one hand… sorry for the missing caps)ALI SIDICKGuestHI
is someone help me ,how to make process&analyse with tems investigation.and also can help me to find more experience about optimisation network.
BR//
ALI SIDICKSalahGuestSorry engineers but i want to ask what are the best,accepted,poor ranges of rxlev and rxqual?
pixGuestrxlev good > 75dBm
rxqual good > 4rxlev bad < 85dBm rxqual bad < 5 cheers pix
pixGuestoops
rxqual good 0…4
rxqual bad 5…7sorry 🙁
NAGuestThe formula for W to dBm conversion is X (dBm)=10 log Y (mW)
so when we convert the smaller power as 0.3 mW
that will be written as :X dBm = 10 log 0.3
= 10 log 3^(1)
= – 10 log 3
= – 10*0.477
= – 4.77 dBmgives 0.3 mW = 4.77 dBm
so, it is clear here why ve sign pops out to the value when we calculate the Rx level, as Rx level is always smaller, but Tx is always +ve because it is near the transmitter giving much power.
thanx
vickyGuesti think what we are receiving is the addition and subtraction of Tx power,various gains and losses encountered and when we calculate ( LB) final fig is ve i.e. rx lev expected.
ArifGuestcan anybody tell me about sudden CSBR increment on any gsm Ericsson’s cell? Parameter tuning didn’t decrease FR traffic. Is it the affect of VOIP call? As it removes automatically!
SantosGuesthello there would you please help me
I have this
14=96dbm
15= ??can you please show me how to calculate this
RexGuestHi Santos,
it’s RSSI coded value against RxLev.
RSSi ranges from 0 to 63 which is equal to range 110 dBm to 47 dBm.
So,
110 dBm : RSSI=0
109 dBm : RSSI=1 and so on till
.
.
47 dBm : RSSI=63.
In your question if 96 dBm is 14 then 15 is 95 dBm.
Regards,
Rex 
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