Page 45 - ITU Kaleidoscope 2016

ICTs for a Sustainable World

Fig. 7). This helped to narrow do wn the testing parameters - The data speeds are higher in CDMA technology
such as technology, frequency band, tower height, etc. because of its robust designing, this will help
enhance the access of mKRISHI® Fisheries app.
4.1.3 Boat Test Drive 3 – BTS configuration - CDMA is less prone to interference In GSM,
Encouraged by the above analysis, TTL decided to carry managing interference in open area like sea is a
out a detailed technology comparison pilot. It installed big challenge
CDMA Base Station Transceiver System (BTS) at two sites - In CDMA, more users can make simultaneous
in Raigad district i.e. at Sasawane and Varsoli and a CDMA calls compared to GSM
+ GSM BTS at Borli-Mandla site.

The boat test drive started from Mandawa port (north point
of Raigad) in the boat Dronagiri Mauli and journeyed
south-west cruising at 10kmph. We reached towards a spot
in the sea, 29km from Borli landing center. From there we
returned to a distance of approx. 15km from the coast and
moved towards Mandawa. During the journey, two tough
books kept making automatically latching to nearest BTS in
the region and measured the call and data quality. The
results have been summarized in the Table 1 and plotted in
the fig. 8 and 9.

This drive helped narrow down the choice of the cellular
technology and type of the BTS to be used to achieve the
maximum distance in the sea.
Figure 7. Boat Test Drive 2 for GSM vs. CDMA test
4.2 Selection of the cellular technology
While comparing both the technologies, CDMA technology
has certain advantages over GSM technology, as listed
below:
- The link budget comparison indicates that the
coverage reach of CDMA will be higher than the
coverage provided by GSM technology due to
lower band i.e. 850MHz.
- CDMA technology employs processing gain
concept which enhances the coverage.
- CDMA technology has superior quality by virtue
of soft handoff.

Table 1 Boat Test Drive 3 - Test Results
CDMA TRIAL SETUP GSM TRIAL SETUP Figure 8. Boat Test Drive 3 - CDMA tower call results
CDMA 850 MHz GSM 1800 MHz
Coverage reach for CDMA Coverage reach for GSM (Voice
(Voice + Data) – approx 25 km + Data) – approx 16 km
This is with conventional solution This is with un-conventional
– solution –
Standard BTS – No Tower Top Tower Top BTS.
solution .
Normal Gain antenna used Normal Gain antenna used
No special feature used Special feature PBT deployed
Incidental coverage beyond 25km Incidental coverage beyond
may be possible 16km may be possible
The coverage reach can be further The coverage reach can be
enhanced, with Tower Top BTS, further enhanced, with High gain
High gain antennae (20.5 dB antenna (20.5 dB gain), to 20+
gain), to 30+ km km

Figure 9. Boat Test Drive 3 - GSM tower call results

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