UMTS Uplink Budget Housa Ho usam m Al-Ho Al-Housa usami mi E-mail:
[email protected] [email protected]
Lucent Technologies Proprietary
Main Objectives In this presentation you will be able to:
1. Understand how the UMTS uplink budget works. 2. Learn how each parameter in the link budget is derived (or calculated). 3. Differentiate between customer specific and vendor specific parameters.
Lucent Technologies Proprietary
H. Al-Housami July 02
No.2
What Wh at iis s a “Powe “Power” r” Lin Link k Bu Budge dget? t?
Power Link Budget: A calculation of the achievable path loss while accounting for all sources of gain, attenuation and noise.
Lucent Technologies Proprietary
H. Al-Housami July 02
No.3
“Pow “P ower er” ” Li Link nk Budg Budget et
SNR : Signal to Noise Ratio. Indicates the level of the Rx signal in in comparison to the level of noise (+ Rx interference) so that communication could be established effectively.
SNR (dB) = Rx signa signall - noise noise
SNR SN R (dB (dB)) = Tx sign signal al + a all ll ga gain ins s - pa path th loss loss - ot othe herr los losse ses s - no nois ise e
Path Pat h loss loss (dB) (dB) = Tx signal signal + all gains gains - other other los losses ses - ( SNR SNR + Nois Noise) e)
Rx Sensitivity
Lucent Technologies Proprietary
H. Al-Housami July 02
No.4
Uplink Budget Added Bit rate system noise Total TX power available Loading converted to Loading in the noise risecell due to other users Bit rate
bit/s
d Bm
TX antenna gain Body loss
d Bi dB
TX EIRP per traffic channel
d Bm
RX antenna gain
d Bi
RX cable and connector losses
dB
Receiver noise figure converted to dB TxService an ante tenn nna a + Thermal noise density gain, e.g. 2dBi Cell loading Bit Rate Attenuation due for a dipole Effective to body Noise rise due to interference Rx antenna Max. UE power Isotropic Power obstruction. Total effect of noise
from the Tx gain in the Information rate boresight Cable and Attenuation antenna direction connector through Source lossesEffective required Eb/No between the Rx RX sensitivity building thermal noise We will walls antenna and the study these Soft Handoff Gain cabinet parameters Fast fading Margin in more Log normal fade margin detail in In-building penetration loss (urban) subsequent sections Maximum path loss urban
dB dBm/Hz
a 21 b
64000
c d 23 e=b+c-d 18 f 3g 2 0
3h -174 j
k dB 5.23 l=10*log10(1/(1-(k/100))) dBm/Hz -171 m=h+j dBHz 48.06 n=db(a) dB 2 .5 4 o p=l+m+n+o+correction correction factor d Bm -115.40 p=l+m+n+o+ dB 4 .5 q %
70
dB dB
2.5 r 1 1 .6 s
dB
20 t
dB
Lucent Technologies Proprietary
123.80 pl=e+f+q-g-p-r-s-t H. Al-Housami July 02
No.5
Path Pa th loss loss = Tx sign signal al + all all gain gains s - loss losses es - ( SNR SNR + No Nois ise) e) Bit rate
bit/s
Total TX power available
d Bm
TX antenna gain Body loss
d Bi dB
TX EIRP per traffic channel
d Bm
RX antenna gain
d Bi
RX cable and connector losses
dB
Receiver noise figure Thermal noise density
dB dBm/Hz
Cell loading
a 21 b
64000
c d 23 e=b+c-d 18 f 3g 2 0
3h -174 j
%
70
Soft Handoff Gain
k dB 5.23 l=10*log10(1/(1-(k/100))) dBm/Hz -171 m=h+j dBHz 48.06 n=db(a) dB 2 .5 4 o p=l+m+n+o+correction correction factor d Bm -115.40 p=l+m+n+o+ dB 4 .5 q
Fast fading Margin Log normal fade margin
dB dB
2.5 r 1 1 .6 s
In-building penetration loss (urban)
dB
20 t
Maximum path loss urban
dB
Noise rise due to interference Total effect of noise Information rate Effective required Eb/No RX sensitivity
Lucent Technologies Proprietary
123.80 pl=e+f+q-g-p-r-s-t H. Al-Housami July 02
No.6
Maximum Path Loss Calculation
EIRP Gains+ all the
−
=
Rx sensitivity +all the losses
Maximum Path Loss
Bit rate
bit/s
64000 a
Total TX power available
dBm
21 b
TX antenna gain
dBi
2 c
Body loss
dB
0 d
TX EIRP per traffic channel
dBm
23 e=b+c-d
RX antenna gain
dBi
18 f
RX cable and connector losses Receiver noise figure
dB dB
3 g 3 h
Thermal noise density
dBm/Hz
Cell loading
%
Noise rise due to interference
dB
Total effect of noise Information rate
dBm/Hz dBHz
Effective required Eb/No
dB
RX se sen nsiti sitivi vity ty
dB dBm m
Log normal fade margin
dB
Soft Handoff Gain
dB
4.5 r
Fast fading Margin
dB
2.5 s
In-building penetration loss (urban)
dB
20 t
Maximum path loss urban
dB
Lucent Technologies Proprietary
-174 j 70 k 5.23 l=10*LOG10(1/(1-(k/100))) -171 m=h+j 48.06 n= n=dB(a) 2.54 o -115 -115.4 .40 0 p= p=ll+m+n +m+n+ +o+ o+co corr rre ecti ction fact factor or 11.6 q
123.80 pl=e+f+r-g-p-q-s-t
H. Al-Housami July 02
No.7
End
Lucent Technologies Proprietary
