Problem of Drop -Calls

The Call drop in mobile network can be caused by any or combination of the following reasons:
Equipment related problems in the radio access network, Interference in the radio frequency, either co-channel or adjacent channel interference, Handover failure on account of inadequate coverage or inadequate equipment capacity to handle the traffic, Antenna related problem, and/or Inadequate telecom resources to cope with the increased traffic on account of growth in the subscriber base.
Further, since the service provider is to ensure coverage in at least 90% of the district headquarter/town bounded by municipal limits where service have been rolled out, customer moving from a coverage area to a non coverage area may experience call drop. Thus call drop in wireless network can not be removed completely. The network planning and installation of necessary equipment and infrastructure is a continuous process as per growth in subscriber base, to cater to the increased traffic and for expanding the network coverage. The equipment of number of tower is based on total number of Base Transceiver Stations (BTSs).
In BSNL & MTNL, Quality of Service (QoS) improvement is a continuous process. Measures like BTSs addition, capacity augmentation and up gradation as per requirement, antenna tilting, optimization of network and drive test are undertaken on a continuous basis by BSNL & MTNL to improve the mobile services.
This information was given by the Minister of State Ministry of communications and Information Technology Shri Sachin Pilot in Rajya Sabha today.