مخطط جديد للتحكم بقبول المكالمات لتقديم نوعية الخدمة في الشبكات اللاسلكية
Abstract
يعد تقديم ضمانات نوعية الخدمة في مقدمة التحديات التي تواجهها الشبكات اللاسلكية الخلوية المتنقلة بسبب قلة الموارد من جهة وتنقل المستخدمين من جهة أخرى.
تلعب مخططات التحكم بقبول المكالمات دورا أكثر أهمية في الشبكات اللاسلكية الخلوية المتنقلة وهي تستخدم لتحقيق بعض بارامترات نوعية الخدمة المطلوبة.
يقترح هذا البحث مخططا جديدا للتحكم بقبول المكالمات لتقديم نوعية الخدمة في الشبكات اللاسلكية الخلوية المتنقلة باستخدام معيار أولوية متكيف جديد يقوم بإعطاء أولويات مختلفة لتحقيق هدف نوعية الخدمة على مستوى المكالمة بمفهوم احتمالات توقيف المكالمات الجديدة.
تبين نتائج المحاكاة الواردة في هذا البحث بأن المخطط الجديد المقترح الذي يستخدم معيار الأولوية المتكيف الجديد بالمقارنة مع مخطط تحديد المكالمات الجديدة يقدم أداء أفضل بمفهوم احتمالات توقيف المكالمات الجديدة وهو يضمن أي مستوى مطلوب من نوعية الخدمة لأنواع المكالمات الجديدة مع المحافظة على أولوية المكالمات المسلَّمة.
Because of the lack of resources, on the one hand, and user's mobility, on the other, provision of quality-of-service (QoS) guarantees is considered one of the challenges that wireless cellular mobile networks face. Call Admission Control (CAC) schemes play a more important role in wireless cellular mobile networks. They are used for achieving some desired QoS parameters. This paper proposes a new CAC scheme for providing QoS in wireless cellular mobile networks using a new adaptive priority criterion which gives different priorities for achieving a QoS target on the call level in terms of new call blocking probabilities. The Results of simulation provided in this paper show that the proposed new CAC scheme using the new adaptive priority criterion compared with new call bounding scheme (NCBS) provides a better performance in terms of new call blocking probabilities and guarantees any desired level of QoS for new call types, while keeping priority hands-off calls.
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