The CDMA 1x RTT network is deployed in 577
SDCAs comprising of over 600 cities and towns across India,
covering more than 65% of the urban population.
This wireless network will allow Reliance Infocomm to offer
cutting-edge next generation applications (e.g. data speeds
upto 144 kbps, centrex, m-transactions) and services (e.g.
over the air provisioning, quick net connect).
The wireless network has been architected keeping in mind
future service and capacity upgrade requirements. Some of
the key points to note about the network's future proofing
are -
CDMA is the perfect RF technology for convergence, due to
the asynchronous nature of the media access technique. This
makes it a natural fit for packet-based access and traffic.
CDMA 1X RTT can provide data speeds of upto 144 kbps, which
meet the IMT- 2000 specifications for next generation vehicular
trafic. With the addition of two permutations ( 1X EV -DO
and 1X EV -DV) it can also reach the specified next generation
targets for stationary and nomadic users. Its bandwidth capacity
therefore far outstrips that of competing systems, and is
likely to suffice for many years to come.
CDMA vs GSM
CDMA requires fewer cell sites than the GSM and TDMA (Time
Division Multiple Access) digital mobile phone systems, and
provides up to three to five times their calling capacity
due to higher spectral efficiency. Compared to an analogue
cell phone system (AMPS), CDMA provides 20 times the capacity.
Unlike other digital systems that use TDMA, which divides
the spectrum into different time slots, CDMA's spread spectrum
technique overlaps every transmission on the same carrier
frequency by assigning a unique code to each conversation.
After the voice converts to digital signals, CDMA spreads
the data stream over the full 1.25MHz bandwidth of the CDMA
channel, coding each stream separately so it can be decoded
at the receiving end.
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