Download - Vega in argentina 12.06
Coverage Extension and savings in cellular infrastructure
A solution with the VEGA antenna in Miramar – Cordoba, Argentina
BTS Miramar-CO043 CDMA 850MHz
BTS to targetarea – 4 Kms.
Challenge:Low coverage in Miramar (Cordoba)Argentina, that does not guarantee indoor service
There is no leading signal. There exist3 – 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 DB858DG65ESXAzimuth 65° tilt 1° height aprox. 90 m.
*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 – 960Polarization +45° -45°Gain 22.5 dBiBeam width (h & v) 11.5Front – back ratio >28 dBDown tilt 0° - 15°
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
Plots of Best Server by Sector
Major Servers by rankFrec. 242: 48.7% of samplesFrec. 219: 35.2% of samplesFrec. 218: 6.03% of samples
Major Servers by rankFrec. 242: 94.15% of samplesFrec. 241: 3.38% of samples
Frec. 224: 1.85% of samples
Before adding VEGA antenna After adding VEGA antenna
AfterBefore
Best Server by Force of Signal level at all SitesLevels were lower than -93 dBm which couldnot guarantee indoorcoverage
Improvement in levels of over15 dBm. New levels guaranteegood indoor service
After Before
% de Muestras de Propagación Frec. 242Rangos de Nivel de Señal en dBm
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
>71
71-8
3
83-9
3
93-1
04
Rangos
Después Antes
Propagation plots channel 242
The VEGA antenna has created a notable improvement as observed in coverage distribution
Percentage of samples of frequency 242ranked in dBm
After Before
Level
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