A network facing coverage problems has bad RxLev. RxQual can be bad at the same time. Sometimes the RxLev can look OK on the street (i.e. from drivetest) but coverage inside the buildings can be po...
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Enhanced EDGE Coverage(GBSS16.0_01)
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PSI Coverage - RF Power Calculator Revision: Prepared: Approved:
A ehesmic erahul
Purpose
The purpose of this tool is to aid engineeers deploying PSI coverage. It provides a "side by side" comparison of the RF chains for a "standard" solution and a "PSI coverage" solu Specifically, it will aid with setting the attributes which determine the dowlink power and reference point. The user can set the key attributes and see how the power levels and link budget are impacted. The tool also provides recommended parameter values.
Usage
Simply set the variables in blue and observe the results. The tool gives recommendations for certain parameters. If you ignore a recommendation and set a different value then the recommendation is (usually) highlighted "Undesirable" or "less than optimal" values are highlighted in red, even all parameters are set correctly. This tool assumes that there is only one carrier per (R)RU (ie. all power is available for the one cell or 3 cel
Useful Docs Guideline: RN formulas and dimensioning data - insert link Guideline for initial pilot power setting at the reference point (older one) - insert link PSI dimensioning guideline - insert link
To do Add noise rise in both the uplink and downlink. This will affect link balance if they are different.
Support For support, or suggestions for improvements, please contact the author.
Revision History Revision A
Comment First release
Date 20-Feb-13
on and a "PSI coverage" solution. ower and reference point. get are impacted.
ation is (usually) highlighted in red. ameters are set correctly. lable for the one cell or 3 cell portions).
hey are different.
3x1 Configuration Attribute (R)RU power TMA installed? Reference point Desired Total/Pilot ratio maximumTransmissionPower primaryCpichPower Attenuation btwn (R)RU and ref point AntFeederCable.dlAttenuation (R)RU power in dBm maxDlPowerCapability Actual Total/Pilot ratio Shortfall in available power Zero noise rise link balance* Approximate MATPL*
Value
Recommended
20 W 0 (R)RU (R)RU 10.0 dB 430 430 330 330 0.0 dB 0 43.0 dBm 430 10.0 dB 0.0 dB -1.0 dB (UL limited) 147.4 dB
Change values in blue only
Total power per cell of PSI is highe MATPL of PSI is bette
0.0 dB
Total
Pilot
19.1 W 42.8 dBm
1.9 W 32.8 dBm
19.1 W 42.8 dBm
1.9 W 32.8 dBm
20.0 W 43.0 dBm
2.0 W 33.0 dBm < Ref point
Total/Pilot ratio of PSI is highe DL capacity of PSI is
Jumper loss
0.0 dB
No TMA
0.2 dB
Feeder loss
0.2 dB
Tot DL Loss
TMA TMA TMA
(R)RU (R)RU (R)RU
PSI Configuration Attribute (R)RU power TMF installed? Reference point Priority for PSI Coverage maximumTransmissionPower primaryCpichPower Attenuation btwn (R)RU and ref point AntFeederCable.dlAttenuation (R)RU power in dBm maxDlPowerCapability Actual Total/Pilot ratio Shortfall in available power Zero noise rise link balance* Approximate MATPL*
Value
Recommended
80 W 1 TMA Maintain coverage 433 320 5.7 dB 55 49.0 dBm 433 11.3 dB 0.0 dB 0.0 dB (balanced) 147.4 dB
80 W TMA Maintain coverage 433 323
Change values in blue only
Comparison Pilot of PSI is lower by 1.0 dB
Total power per cell of PSI is higher by 0.3 dB MATPL of PSI is better by 0.0 dB
Total/Pilot ratio of PSI is higher by 1.3 dB capacity of PSI is X% of 3x1 capacity 36%
0.2 dB
Total
Pilot
20.4 W 43.1 dBm
1.5 W 31.8 dBm
21.4 W 43.3 dBm
1.6 W 32.0 dBm < Ref point
79.4 W 49.0 dBm
5.9 W 37.7 dBm
Jumper loss
0.2 dB
DL loss
0.2 dB
Jumper loss
5.1 dB
DL loss
0.2 dB
Feeder loss
5.9 dB
Tot DL Loss
TMF
TMF
TMF
Splitter/ Combiner
(R)RU
Info Power Lookup 80 W 49.0 dBm 60 W 47.8 dBm 40 W 46.0 dBm 20 W 43.0 dBm 2W 33.0 dBm
Ref Point Options Antenna TMA (R)RU
* Note that a 32 dBm pilot at the first active uplink elment is roughly balanced. More than this and the system will be UL limited, less and the system will be DL limited. Assumed UE sensitivity is -115.6 dBm. So the Maximum Allowable Transmission Pathloss (MATPL) will be roughly 147.6 dB minus any downlink link balance limitation minus any DL losses between the first active UL element and the antena. The above assumptions allow the link balance and MATPL to be calculated appoximately, without having to fully model the uplink chain.
TMA Options 1 0 PSI Options Maintain coverage Maintain capacity Limits on recommended Total to pilot ratio 11.0 dB 8.9 dB Pilot/Tot [%] Tot/Pilot [dB] 5% 13.0 dB 6% 12.2 dB 7% 8%
11.5 dB 11.0 dB
9% 10%
10.5 dB 10.0 dB
11% 12% 13% 14% 15%
9.6 dB 9.2 dB 8.9 dB 8.5 dB 8.2 dB
2x1 Configuration Attribute (R)RU power TMA installed? Reference point Desired Total/Pilot ratio maximumTransmissionPower primaryCpichPower Attenuation btwn (R)RU and ref point AntFeederCable.dlAttenuation (R)RU power in dBm maxDlPowerCapability Actual Total/Pilot ratio Shortfall in available power Zero noise rise link balance* Approximate MATPL*
Value
Recommended
20 W 0 (R)RU (R)RU 10.0 dB 430 430 330 330 0.0 dB 0 43.0 dBm 430 10.0 dB 0.0 dB -1.0 dB (UL limited) 147.4 dB
Change values in blue only
Total power per cell of Y is highe MATPL of PSI is bette
0.0 dB
Total
Pilot
19.1 W 42.8 dBm
1.9 W 32.8 dBm
19.1 W 42.8 dBm
1.9 W 32.8 dBm
20.0 W 43.0 dBm
2.0 W 33.0 dBm < Ref point
Total/Pilot ratio of Y is highe DL capacity of Y is
Jumper loss
0.0 dB
No TMA
0.2 dB
Feeder loss
0.2 dB
Tot DL Loss
TMA TMA
(R)RU (R)RU
Y Configuration Attribute (R)RU power TMF installed? Reference point Priority for Y Coverage maximumTransmissionPower primaryCpichPower Attenuation btwn (R)RU and ref point AntFeederCable.dlAttenuation (R)RU power in dBm maxDlPowerCapability Actual Total/Pilot ratio Shortfall in available power Zero noise rise link balance* Approximate MATPL*
Value
Recommended
80 W 1 TMA Maintain coverage 450 330 4.0 dB 38 49.0 dBm 450 12.0 dB 0.0 dB -1.0 dB (UL limited) 147.4 dB
80 W TMA Maintain coverage 450 340
Change values in blue only
Comparison Pilot of Y is higher by 0.0 dB Total power per cell of Y is higher by 2.0 dB MATPL of PSI is better by 0.0 dB
Total/Pilot ratio of Y is higher by 2.0 dB L capacity of Y is X% of 2x1 capacity 63%
0.2 dB
Total
Pilot
30.2 W 44.8 dBm
1.9 W 32.8 dBm
31.6 W 45.0 dBm
2.0 W 33.0 dBm < Ref point
79.4 W 49.0 dBm
5.0 W 37.0 dBm
Jumper loss
0.2 dB
DL loss
0.2 dB
Jumper loss
3.4 dB
DL loss
0.2 dB
Feeder loss
4.2 dB
Tot DL Loss
TMF
TMF
Splitter/ Combiner
(R)RU
Info Power Lookup 80 W 49.0 dBm 60 W 47.8 dBm 40 W 46.0 dBm 20 W 43.0 dBm 2W 33.0 dBm
Ref Point Options Antenna TMA (R)RU
* Note that a 32 dBm pilot at the first active uplink elment is roughly balanced. More than this and the system will be UL limited, less and the system will be DL limited. Assumed UE sensitivity is -115.6 dBm. So the Maximum Allowable Transmission Pathloss (MATPL) will be roughly 147.6 dB minus any downlink link balance limitation minus any DL losses between the first active UL element and the antena. The above assumptions allow the link balance and MATPL to be calculated appoximately, without having to fully model the uplink chain.
TMA Options 1 0 Y Options Maintain coverage Maintain capacity Limits on recommended Total to pilot ratio 11.0 dB 8.9 dB Pilot/Tot [%] Tot/Pilot [dB] 5% 13.0 dB 6% 12.2 dB 7% 8%
