Abstract
This article discusses a methodology for rating the quality of mobile calls. Majority telecommunications service from the perspective of the whole world is using mobile telephony networks. One of the problems affecting this service and its quality are landscape barriers, which prevent the spread signal. Price and complex construction of classic BTS does not allow their dense distribution. In such cases, one solution is to use OpenBTS technology. Design of OpenBTS is more available, so it can be applied to much more places and more complex points. Purpose of this measurement is a model for effective stations deployment, due to shape and distribution of local barriers that reduce signal power, and thus the quality of speech. GSM access point for our mobile terminals is OpenBTS USRP N210 station. The PESQ method for evaluating of speech quality is compared with the subjective evaluation, which provides Asterisk PBX with IVR call back. Measurement method was taken into account the call quality depending on terminal position. The measured results and its processing bring knowledge to use this technology for more complicated locations with degraded signal level and increases the quality of voice services in telecommunications.
Highlights
Typical errors encountered by mobile transfers are: impulse noise, short interruptions, trimming and nonlinear signal distortion using a loss-codecs
This article shows how to use two methods to measure the quality of a call for GSM networks
It evaluates the performance of the project OpenBTS in real operation
Summary
Typical errors encountered by mobile transfers are: impulse noise, short interruptions, trimming and nonlinear signal distortion using a loss-codecs Another reason of distortion channel of communication in GSM networks are landscape barriers and constructions. OpenBTS software itself is written in the programming language C++ and allows you to connect calls between registered stations to the created network and between networks of different providers too. The protocol ensures that messages are sent without error and executed in the correct order In this layer are generated logical channels. Asterisk PBX and OpenBTS software can be installed on the same workstation This arises implementation of a fully functional mobile network operated by a single device. Mobile station that is successfully registered on the network created by the OpenBTS software is identified by ”IMSIxxxxxxxxxxxxxx” shape in the VoIP network. Operations in OpenBTS are translated into the corresponding SIP operations and executed by Asterisk [3], [4], [10]
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