Radio access and Transmission models foruniversal service
Idriss Saleh BACHAR*, Ahmed Dooguy KORA**, Roger Marcelin FAYE***, Christelle
Aupetit-Berthelemot***** Autorité de Régulation des Communications Electroniques et Postes, BP 5808, Ndjamena, TCHAD**École Supérieure Multinationale des Télécommunications, BP 10000, Dakar, SENEGAL*** École Supérieure Polytechnique, BP 5085, Dakar-Fann, SENEGAL**** Xlim/SRI/Resyst, UMR-CNRS 7252, University of Limoges, 16 rue Atlantis 87068 Limoges Cedex, FRANCEi.bachar@arcep.td, ahmed.kora@esmt.sn, roger.faye@ucad.edu.sn, christelle.aupetit-berthelemot@xlim.fr

Abstract— This paper proposes two mathematical models as a decision tool for the choice of radio access and transmission
solutions adapted to a geographical region through universal access. The first mathematical model integrates the formalism related
to engineering radio network access in general as well as financial constraints imposed by the access and universal service funds. The
second mathematical model is the equivalent of the first applied to radio transmission systems. Services considered are voice and dataservices. This approach has helped to derive two general expressions set for radio access and radio transmission technologies. The
coverage and capacity deployment strategy has also been combined to clarify the optimal implementation based on financial
constraints. A case study on the Ouaddai and Oura regions in Chad accompanied by simulations curves for wireless technologies as
Wi-Fi, WiMAX, CDMA, and Open BTS for example has shown the efficiency of such approach.
(Pt9)Keyword— access network model, radio access, radio access model, radio transmission, radio transmission model, universal
access, universal service.
Bachar Saleh Idriss was born in CHAD on 27/09/1984. He got the Ph.D. degree in telecommunication from the University ofLimoges, France, in 2016. He is the GENERAL DIRECTOR of National School of Information and Communication Technology fromJune 05 up to now. From August 31, 2010 to June 05 GENERAL DIRECTOR of the Regulatory Authority for ElectronicCommunications and Posts (ARCEP CHAD). From 2010 to May 31, 2011, he was president of the Association of Telecommunications
Regulators of Central Africa (ARTAC) and Vice President of the Commission recast texts Officer (Electronic communications,telecommunications regulation and Postal, cybersecurity, Cyber criminality). His research activities cover low cost access network anduniversal services solution appropriate to Africa.
Dr. BACHAR is member of the “Association pour le Developpement de l’Informatique Libre (ADIL) ” in CHAD
Ahmed D. KORA was born in Parakou (Benin Republic) on May 17, 1971 He is graduated in Physics Sciences in 1998 from “Facultédes Sciences Techniques” at “Université d’Abomey–Calavi”, Bénin, where he got his Diplôme d’Etude Approfondie (DEA) in MaterialSciences in 2000. In 2003, he received a Master “Réseaux Télécoms” degree from “Ecole Superieure Multinationale deTelecommunications” (ESMT) and the Ph.D. degree in telecommunication from the University of Limoges, France, in 2007.
He is currently with the ESMT and Head of Research and Innovation Department. His research area covers communications, radio andoptical networks system architecture, universal access, mobile network quality of service and quality of experience, low cost IT systems
for development, etc.
Prof. KORA is IEEE member and also member of Fiber Optic Association.

Roger Marcelin FAYE was born in Thiès (Senegal) on 09/12/1961. He received the engineer degree in Electrical Engineering fromENSUT (Ecole Nationale Supérieure Universitaire de Technologie) Dakar-Senegal in 1989. He obtained the MSc in Control andModelling Industrial Processes from Paris 12 Val de Marne University, Paris-France in 1994 and his PhD in Automatic Control andOperational Research from University of Toulouse III Paul Sabatier, Toulouse-France in 1999.
He is currently full Professor at Ecole Supérieure Polytechnique (ESP) and was the head of Electrical Engineering department at ESP
from 2010 to 2012. He is author and/or co-author of several publications and two books in the fields of Automatic Control. His researchactivities cover but not limited to modelling systems and to IT solutions for Africa.
Prof. FAYE is member of the Senegalese society of complex systems.

Christelle Aupetit-Berthelemot was born in Limoges (France) in 1971. She received the engineer degree in telecommunication fromENSIL (Ecole Nationale Supérieure d’Ingénieurs de Limoges ENSIL-France) in 1995. The same year, she received the M.S. degree andin 1998, a PhD degree in High Frequency and Optic Telecommunications from University of Limoges. She is currently full Professor
and the head of Electronic and Telecommunications department at ENSIL. Her current research activities concern opticaltelecommunications and microwave photonics. Particularly, her interests are focused on the study of the impact of the components on
the system performances, integration of digital techniques of signal processing in optical communication, Radio Over Fiber, andoptoelectronic devices characterization. She has been involved in several Cooperative Projects. She is author and/or co-author of morethan 100 publications. Prof. AUPETIT-BERTHELEMOT is editor in Chief of J3EA review and member of Optical French Society(SFO), of french club EEA and GDR SoC².