طرحی برای موازنه بار در شبکه‌های ناهمگون با استفاده از ارتباط رله‌ای مبتنی بر D2D
محورهای موضوعی : مهندسی برق و کامپیوترشهریار غلامی مهرآبادی 1 , یاسر عطار ایزی 2 * , سروش اخلاقی 3
1 - دانشگاه صنعتی قم
2 - دانشگاه صنعتی قم
3 - دانشگاه شاهد
کلید واژه: ارتباط دستگاه به دستگاهتخصیص منابعتقسیم فرکانسیشبکه‌های ناهمگونموازنه بار,
چکیده مقاله :
شبکه‌های ناهمگون به عنوان جزئی جدایی‌ناپذیر در ارتباطات نسل پنجم، به منظور پاسخ‌گویی به رشد بی‌سابقه نرخ داده مورد نیاز، معرفی شده‌اند. در این شبکه‌ها، وجود انواع سلول‌ها با ایستگاه‌های پایه با توان و ظرفیت‌های متفاوت، امکان استفاده مکرر از پهنای باند در دسترس را فراهم ساخته است. علاوه بر این، بار اضافی روی ایستگاه پایه مرکزی می‌تواند به ایستگاه‌های پایه در زیرسلول‌ها منتقل شود. در این مقاله شیوه‌ای جدید برای چنین مسأله موازنه باری پیشنهاد شده که در آن برخی از کاربران که قبلاً به ایستگاه پایه اصلی متصل بودند، با استفاده از رله‌های D2D، در زیرسلول‌ها سرویس‌دهی می‌شوند. این امر موجب افزایش ظرفیت کلی شبکه، بهبود کیفیت خدمات (QoS) کاربران لبه سلول و پوشش تعداد بیشتر کاربران می‌شود. در این طرح، افزایش حداکثری ظرفیت لینک‌های D2D به صورت یک مسأله بهینه‌سازی مطرح شده که اساساً یک مسأله غیر محدب است. برای حل این مشکل، مسأله اصلی به دو زیرمسأله تخصیص منابع بهینه و جفت‌سازی بهینه زوج‌های کاربر- رله با پیچیدگی بسیار کمتر تبدیل شده است. نتایج شبیه‌سازی‌ها عملکرد بهتر این شیوه را نسبت به سایر طرح‌های پیشنهادی پیشین نشان می‌دهد.
Heterogeneous networks have been regarded as an integral part of fifth generation communication networks in order to respond to the unprecedented growth of required data rates. In such networks, the existence of a variety of cells with base stations of varying capacities and transmit powers has enabled the repeated use of available bandwidth. Moreover, the excess load on the central base station can be directed to the sub-cell base stations. In the current work, a novel approach is proposed for such a load balancing problem in which some nodes previously connected to the main base station can be served by sub-cells through the use of some D2D relays. This will increase the overall network capacity, improve the quality of service (QoS) of cell edge users, and increase covered users. In this design, the maximization of the capacity of D2D links is formulated as an optimization problem which is not convex in general. To tackle this, the main problem is divided into two sub-problems of optimal resource allocation and user-relay pairing problems with much lower complexity. Simulation results demonstrate the superiority of the proposed method over existing works addressed in the literature.
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