It feels that it is needed to cater to the demands of a growing subscriber base, which in turn will reduce call rates. "There is an urgent need to increase the number of the towers so as to cater to the demands of a growing subscriber base.

At the same time, problems like removal of towers from certain areas by authorities should be adequately addressed," said the Technical Paper on Call drop in Cellular Networks released by the Telecom Regulatory Authority of India (TRAI) here on yesterday.

"Moreover, with the increase in the usage of 3G networks, the growth rate of mobile towers supporting 2G networks has reduced. This must be addressed," it further said.

Last month, the TRAI issued a notification, which said mobile phone operators have to compensate subscribers on call drops from January 1 next year at the rate of a rupee for each such failure. Some important countermeasures at telecom service providers' (TSP) end have also been discussed in the paper.

Measures like dynamic channel allocation, multiple call routing and optimised resource management can be employed by the TSP's besides, usage of mobile signal boosters through the TSPs at users' buildings or premises, it said. "Some prioritization schemes like measurement-based prioritization scheme, Call Admission Control Protocol, Guard Channels, Handoff Queuing and Auxiliary Stations essentially need to be incorporated by TSPs to reduce call drops," the telecom regulator said.

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