The document discusses using a VEGA antenna to improve cellular coverage in the Miramar area of Cordoba, Argentina. The existing antenna was only providing coverage up to 4 km from the BTS and not guaranteeing indoor service. Replacing the existing antenna with a VEGA antenna provided significant gains, improving signal levels by over 15 dBm and ensuring good indoor coverage. Tests after installing the VEGA antenna showed a notable improvement in coverage distribution across the target area. The summary concludes that the VEGA antenna successfully improved coverage and insured indoor service, but traffic increases would need to be monitored and nearby sectors strengthened if needed to balance loads.

1. Coverage Extension and savings in
cellular infrastructure
A solution with the VEGA antenna
in Miramar – Cordoba, Argentina
BTS Miramar-CO043
CDMA 850MHz
BTS to target
area – 4 Kms.

2. Challenge:
Low coverage in Miramar (Cordoba)
Argentina, that does not guarantee
indoor service
There is no leading signal. There exist
3 – 4 dominant signals.
The nearest BTS is CO 043 located
about 4 Kms. from Miramar.
The former sector (CO 043 – 1) antenna
aimed at the Community has the
following configuration;
Antenna DB858DG65ESX
Azimuth 65° tilt 1° height aprox. 90 m.

3. *Adding more BTS
(2 – 3 sectors) $$$$
*Tower Top Amplifiers, Repeaters $$$
*Implementation of special features,
antenna hoping, intelligent downlink
diversity $$
*Use of VEGA very high gain narrow
beam dual polarization antennas $
Possible alternatives to improve coverage
Changing Antennas from
DB858DG65ESX
To
VEGA CC-12
Frequency (MHz) 805 – 960
Polarization +45° -45°
Gain 22.5 dBi
Beam width (h & v) 11.5
Front – back ratio >28 dB
Down tilt 0° - 15°

4. Advantages – The VEGA antenna has more
than 5 dB gain and more than three times the
power of the existing panel antenna.
Risk – The narrow horizontal beam of the
VEGA may not support full lateral coverage
The Best Solution – Two panel antennas
DB858DG65ESX with two VEGA CC-12
antennas
Two co-directional antennas are used to
save on power combiner losses due to
large number of carriers required at this area
THE VEGA Antenna Solution

5. Plots of Best Server by Sector
Major Servers by rank
Frec. 242: 48.7% of samples
Frec. 219: 35.2% of samples
Frec. 218: 6.03% of samples
Major Servers by rank
Frec. 242: 94.15% of samples
Frec. 241: 3.38% of samples
Frec. 224: 1.85% of samples
Before adding VEGA antenna After adding VEGA antenna

6. AfterBefore
Best Server by Force of Signal level at all Sites
Levels were lower than
-93 dBm which could
not guarantee indoor
coverage
Improvement in levels of over
15 dBm. New levels guarantee
good indoor service

7. AfterBefore
% de Muestras de Propagación Frec. 242
Rangos de Nivel de Señal en dBm
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
>71
71-83
83-93
93-104
Rangos
Después Ant es
Propagation plots channel 242
The VEGA antenna has created
a notable improvement as
observed in coverage distribution
Percentage of samples of frequency 242
ranked in dBm
After Before
Level

8. Conclusions & Recommendations
*The VEGA antenna notably improved coverage and insured indoor service
to Sector 1 of BTS CO043.
*It should be verified that the increase in traffic does not exceed the present
capacity of this sectors radios.
*If this happens it would be recommendable to strengthen the signal of nearby
sectors to help balance the traffic within the area.
*This new sector should have enough overlay with the current sector in order
to use features such as directed retry. This feature will contribute to balance
the traffic load
Thank You For Your Attention