A feasibility study of powerline communication technology for digital inclusion

ABSTRACT In the current national scene, many actions point at projects of digital inclusion and citizenship. In this context, providing access technologies as a requisite for the implementation of these actions is primordial. In this way, many innovative experiences have been presented in the past few years. This paper presents a study on the Powerline Communication -PLC technology; as a proposal for a feasible access network for Brazilian Amazon. First, the characteristics of the PLC technology are studied from an implanted indoor prototype at Federal University of Pará. The measures used in this prototype serve as input for a created model, from which it is intended to study the system more widely, considering factors such as: scalability, reliability and the physical characteristics

Secure Voip Call on Android Platform

In the Secure voice call, the human voice shall be digitized by the Android APIs and the VOIP packets will travel over the SIP layer. The digitization process also includes the encryption phase wherein secure call technique is used in order to generate unique keys every time a call handshake is done. During the Secure Call key exchange, the caller party sends a Secure Call hello packet. Once that packet is positively acknowledged by the recipient party the handshake happens successfully and the call packets get encrypted. Using Secure call, digitized voice data is transformed into cipher text form on third generation GSM data or GPRS servers in android platform which results in a better encrypted voice speed and clarity

Feasibility study of IP Multimedia Subsystem (IMS) based Push-to-Talk over Cellular (PoC) for public safety and security communications

Feasibility of IMS based PoC over public cellular network, specifically over commercial GPRS network, has been studied for public safety and security communication. Both day-to-day routine work and emergency operation handling capability of the PoC service as well as of the network have been considered. The requirements of PSS communication have been taken as the basis for analysing the technical viability of PoC service for PSS communication. The study is based on publicly available specification documents and related literature. The technical data and factual information have been collected from technical papers, reports and news articles posted into the Internet. The thesis also included a case study comparing over-aged analogue PMR systems and possible PoC service over a nationwide commercial GSM/GPRS network for PSS communication. The key findings in favour of using PoC over commercial GPRS networks include already existed nation-wide radio coverage and roaming across the nation boarder, ease of use, special group call functionality, advanced IMS based multimedia services. The study has identified some challenges of using PoC for PSS communication, which are mainly due to the inherent latency of GPRS access network and lack of prioritisation of special groups of users in commercial networks. Though the PoC service over commercial network does not fulfil all the requirements strictly but taking into account the suggested measures, it can be a good alternative to PMR networks. Use of PoC for PSS communication requires zero initial as well as less operational expenses for the respective PSS organizations. At the same time PSS sector is a potential revenue generating market segment for the operator as well