بهینه‌سازی دگرسپاری در تخصیص ایستگاه پایه توام با کنترل توان در شبکه‌های سلولی ناهمگون با دسترسی چندگانه غیرمتعامد براساس معیار انصاف تناسبی

محورهای موضوعی : مهندسی مخابرات

سینا پیرنیا ¹ , حمیدرضا بخشی ² , محمد دوسرانیان مقدم ³ , رامین خسروی ⁴

1 - گروه مهندسی برق، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
2 - گروه مهندسی برق، دانشکده فنی و مهندسی، دانشگاه شاهد، تهران، ایران
3 - گروه مهندسی برق، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
4 - گروه مهندسی برق، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران

تاریخ دریافت : 1401/06/15 تاریخ پذیرش : 1401/07/25 تاریخ انتشار : 1402/01/01

کلید واژه: کنترل توان, انصاف تناسبی, ایستگاه پایه, دگرسپاری, شبکه با سلول‌های کوچک,

چکیده مقاله :

به منظور پاسخگویی به تقاضای فزاینده‌ای که برای استفاده از خدمات شبکه‌های بی‌‌سیم سلولی نسل جدید به وجود آمده است، شبکه‌‌ی ناهمگون شامل سلول‌‌های کوچک راه حل نظام‌مند و مطلوبی به شمار می‌‌رود. در این تحقیق یک شبکه با سلول‌های کوچک برپایه فن‌‌آوری دسترسی چندگانه غیرمتعامد با روش حذف پی‌‌درپی تداخل را درنظر گرفته‌ایم. شبکه با سلول‌های کوچک، به صورت اجتناب ناپذیری با مشکل تداخل هم کانال و بار ترافیکی نامتعادل مواجه است که این مساله بازده انرژی و طیفی شبکه را تحت تاثیر قرار می‌‌دهد. همچنین در این نوع از شبکه‌ها به دلیل تحرک کاربر، تغییر شرایط کانال ارتباطی و تعداد زیاد دگرسپاری‌‌ها، مقدار زیادی انرژی مصرف می‌شود. بر این اساس، این تحقیق به بهینه‌‌سازی دگرسپاری در مسیر رو به بالای شبکه‌‌های شامل سلول‌‌های کوچک با روش دسترسی چندگانه غیرمتعامد و حذف پی در پی تداخل می‌‌پردازد که در عین حال کنترل توان و تخصیص ایستگاه پایه با لحاظ انصافِ تناسبی در توزیع بار ترافیکی را در نظر می‌‌گیرد. یک مساله بهینه- سازی ترکیبی با تلفیق تخصیص ایستگاه پایه و کنترل توان ارائه شده است که به صورت همزمان توابع فایدهء سیستم و دگرسپاریِ انصاف محور را بیشینه و تابع فایدهء کنترل توان ارسالی را کمینه می‌‌کند. مساله بهینه‌‌سازی با به کاربردن نظریه‌‌های بازی ائتلاف و تجزیه اولیه، حل می‌‌شود. نتایج شبیه‌‌سازی نشان می‌‌دهند که الگوریتم ارائه شده در مقایسه با الگوریتم‌‌های دیگر از نظر تعداد دگرسپاری و انصاف عملکرد بهتری دارد.

چکیده انگلیسی:

The handoff rate and load balancing are two important issues that have a great impact on the spectrum and energy efficiency in the small cell networks. This paper investigates the handoff optimization in small cell networks with power-domain non-orthogonal multiple access that uses successive interference cancellation, considering the fairness among base stations. We study the joint base station association and power control problem by considering the motion of mobile users and load balancing in the small cell networks. Under the maximum allowable transmit power and minimum average-rate constraints, two optimization problems are formulated using the number of associated mobile users, the number of handoffs, and the transmit power of all MUs. The total power consumption minimization and the system-wide and handoff utility maximization problems are combined into a single-stage optimization problem through the weighted sum method. We solve the formulated problem using a game theory-based algorithm and primal decomposition theory. The simulation results show that our proposed algorithm can significantly reduce the frequent handoffs and bring a fair power-controlled BS association in small cell networks.

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