A spectrum of uses
V. SRIDHAR/THOMAS CASEY (Courtesy: Business Line, 05.06.11)
While opinions vary on whether operators are facing a real spectrum
crunch or are not utilising the allotted spectrum effectively, the
Ministry of Communications and IT must look beyond the constant tussle
with Defence over the release of additional spectrum for commercial
mobile services.
It is not hard for us to imagine that given a suitable environment,
mobile data and Internet service penetration in India will scale new
heights, much as mobile voice has done.
According to recent research, the number of mobile Internet users has
jumped from eight million last year to 25 million, and about 49 per cent
use mobile only for Internet access. What can the Ministry and the
Telecom Regulatory Authority of India (TRAI) do to enable India to take
a lead in the adoption of mobile Internet?
Many countries are moving towards a technology-agnostic spectrum policy.
The European Union has embarked on re-farming the traditional 2G
spectrum in the 800 and 900 MHz bands to deploy 3G or even 4G networks
with relatively higher spectral efficiencies, especially for data
services. In India, as there is no level playing field for the 2G and 3G
operators, we have mandated specific technologies (read 2G in 900 MHz
and 3G in 2,100 MHz) for each spectrum band.
The new telecom policy should pave way for a technology- and
service-agnostic roadmap for spectrum management and address the use of
900 MHz for 3G services. This is expected to resolve the spectrum
bottleneck in dense urban areas with minimum cell sites, thanks to the
good propagation characteristics of 900 MHz radio frequencies, including
better in-building coverage and quality of service.
The second alternative is to review the Ultra High Frequency (UHF) band
traditionally used for terrestrial TV broadcasting. Contrary to many
other developed countries, in India there is high penetration of cable
TV and direct-to-home digital satellite TV, even in rural areas. The
terrestrial over-the-air broadcasting is mainly done by Doordarshan.
Hence, there is a clear economic motivation for the Government to switch
to digital terrestrial transmission, thus releasing the 700 MHz band ---
commonly referred to as the "digital dividend spectrum" --- for
commercial mobile services.
Though there seems to be an initiative on this front by the Department
of Telecommunications and TRAI, the pace needs to be quickened.
Broadcast services such as Mobile TV can be effectively provided on
this band. As the US and most of EU plan to release the abovementioned
spectrum band, the compatible equipment and handsets are expected soon
in the market at relatively lower prices. India can jumpstart this
evolution and become a pioneer in the implementation of digital dividend.
Under the third option, the Government can allow the development of a
range of secondary markets. With no operator given nationwide allocation
of 3G/ Broadband Wireless Spectrum (BWA), users are expected to pay
hefty roaming charges.
In the simplest form, the Government should allow "national roaming"
wherein a subscriber of Operator 1 can hook on to the network of
Operator 2 wherever the former has no network, through an appropriate
spectrum and capacity sharing agreement. The user will be treated as an
"in-net" subscriber and no roaming charge will apply. This is allowed in
many EU countries. This method promotes sharing of scarce network
resources and improves utilisation.
Other approaches range from allowing Mobile Virtual Network Providers
access to under-utilised spectrum of network operators; allowing network
operators to share spectrum amongst themselves in a manner that promotes
efficient utilisation; and, finally, opting for the Dynamic
Opportunistic Spectrum Sharing methods, which are being deployed on an
experimental basis in the US, wherein any service provider or user can
opportunistically seize vacant spectrum blocks, either licensed or
unlicensed (as in the case of TV white spaces that exist between
adjacent TV channels) in a non-interfering way.
In the US, the Federal Communications Commission has designated eight
entities, including Google, for managing such TV white space spectrum
databases. The cognitive radio-based systems that embed detection of
such vacant spectrum blocks using spectrum databases, though currently
at an incipient stage, are expected to completely overhaul today's
"command and control" regime of spectrum management.
The Government could think along these lines and provide a roadmap that
can help the industry plan better. Tools such as Spectrum Management
System for Developing Countries (SMS4DC), developed by the International
Telecommunications Union, should be used by the Wireless Planning and
Coordination Wing of the Department of Telecommunications. On the other
hand, operators should welcome the above initiatives and embrace newer
technologies that can enable us to network and communicate better, and
hence prosper in the knowledge- and service-based century.
/(Dr. V. Sridhar is Research Fellow, Sasken Communication Technologies,
Bangalore, India and Thomas Casey is Research Scientist, Department of
Communications and Networking, Aalto University, Finland. Views are
personal. )/
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N.Ramakrishnan
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