فهرس المقالات Dumtochukwu Oyeka المقاله 1 - Re-CAC: A Re-Engineered Call Admission Control for LTE Downlink Networks Using Stepwise Bandwidth Degradation Concept 10.66224/jist.48095.14.53.16 Vitalis Onyeke Udora Nwawelu Bonaventure Ekengwu Nnaemeka Asiegbu Benjamin Ezurike Dumtochukwu Oyeka Chukwudi Chukwudozie Chimdalu Okide Journal of Information Systems and Telecommunication (JIST) , العدد 2 , السنة 14 , زمستان 2026