ارتباطات دستگاه به دستگاه زیر-لایه در شبکه‌های سلولی موج-میلیمتری: تخصیص کانال، انتخاب نوع ارسال و کنترل توان برای سناریوهای با اطلاعات جانبی کانال کامل و محدود
محورهای موضوعی : مهندسی مخابرات
1 - گروه مهندسی برق، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران
کلید واژه: نسل پنجم شبکه‌های سلولی, موج میلیمتری, تخصیص منابع, ارتباطات دستگاه به دستگاه زیر-لایه, رله تمام-دوطرفه,
چکیده مقاله :
در این مقاله، ارتباطات دستگاه به دستگاه زیر-لایه در باند فرکانسی موج-میلیمتری مورد بررسی قرار گرفته است که در آن می‌توان از رله‌های نیمه-دوطرفه / تمام-دوطرفه برای بهبود کیفیت ارسال و افزایش محدوده پوشش کمک گرفت. هدف اصلی ما انتخاب توام مود ارسالی کاربران D2D، تخصیص منابع سلولی به کاربران D2D و کنترل توان کاربران به منظور بیشینه کردن مجموع نرخ دیتای شبکه‌ی سلولی و کاربران D2D است. در تحلیل‌های انجام گرفته بر روی ویژگی‌های اصلی مخابرات موج-میلیمتری شامل پهنای باند بزرگ‌تر، امکان استفاده از آنتن‌های آرایه‌ای جهت‌دار، و سایه‌افکنی و افت توان بیشتر متمرکز شده‌ایم. از آنجا که مساله‌ی بهینه‌سازی یک مساله‌ی برنامه‌ریزی غیرخطی مختلط است، دو الگوریتم ابتکاری برای حل این مساله پیشنهاد داده‌ایم که در یکی از آن‌ها از فرض در دسترس بودن کامل اطلاعات جانبی کانال و در دیگری از فرض محدودیت در دسترسی به این اطلاعات استفاده شده است. نتایج شبیه‌سازی نشان دهنده‌ی برتری استفاده از رله‌های تمام-دوطرفه در مقایسه با استفاده از رله‌های نیمه-دوطرفه و ارتباط مستقیم کاربران به‌ویژه در لینک‌های دید غیر مستقیم -که مکانیزم اصلی انتشار در شبکه‌های موج-میلیمتری است- است. به عنوان مثال، استفاده از رله‌های تمام-دوطرفه می‌تواند نرخ دیتای مجموع را تا 1.5 برابر در مقایسه با رله‌های نیمه-دوطرفه افزایش دهد. همچنین داشتن قابلیت انتخاب بین ارتباط مستقیم یا استفاده از رله (نیمه-دوطرفه / تمام-دوطرفه) می‌تواند به بهبود عمل‌کرد سیستم - به‌ویژه هنگامی‌که میزان خود-تداخلی باقی‌مانده رله‌های تمام-دوطرفه بزرگ است - کمک کند. الگوریتم CSI محدود در مقایسه با CSI کامل دارای پیچیدگی پیاده‌سازی به مراتب پایین‌تری است. علاوه براین، هنگامی‌که تعداد منابع در دسترس در مقایسه با تعداد کاربران D2D خیلی بیشتر است (حداقل 6 برابر)، فاصله‌ی عمل‌کردی بین الگوریتم CSI کامل و CSI محدود از بین می‌رود.
In this paper, we study relay-assisted underlay D2D communication operating at millimeter-wave (mmWave) band in which half-duplex/full-duplex relays may assist D2D users to improve transmission quality. Our aim is to jointly select D2D transmission mode, assign cellular resource blocks to D2D users and control the powers of users in order to maximize the aggregate data rate of the D2D users and cellular network. We focus on the main features of mmWave communication including larger bandwidth, directive antenna arrays at BS and users, and more severe path loss and shadowing. As the optimization problem is mixed-integer-non-linear programming, two heuristic algorithms are proposed, assuming full Channel Side Information (CSI) and limited CSI at Base Station, respectively. Simulation results show the superiority of utilizing FD relays over HD relays and direct transmission, especially for non-line-of-sight links, which is the dominant propagation mechanism in mmWave band. The limited CSI algorithm has considerably lower complexity. Moreover, when the number of resource blocks far exceeds the number of D2D users, the gap between full CSI and limited CSI algorithms vanishes.
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[1] A.Asadi, Q. Wang, and V. Mancuso, “A survey on device-to-device communication in cellular networks,” IEEE Communications Surveys & Tutorials, vol. 16, no. 4, pp. 1801–1819, 2014, doi: 10.1109/COMST.2014.2319555.
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[3] P. Mach, Z. Becvar, and T. Vanek, “In-band device-to-device communication in ofdma cellular networks: A survey and challenges,” IEEE Communications Surveys & Tutorials, vol. 17, no. 4, pp. 1885–1922, 2015, doi: 10.1109/COMST.2015.2447036.
[4] H. A. U. Mustafa, M. A. Imran, M. Z. Shakir, A. Imran, and R. Tafazolli, “Separation framework: An enabler for cooperative and d2d communication for future 5g networks,” IEEE Communications Surveys & Tutorials, vol. 18, no. 1, pp. 419–445, 2015, doi: 10.1109/COMST.2015.2459596.
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[7] P. Sun, K. G. Shin, H. Zhang, and L. He, “Transmit power control for d2d-underlaid cellular networks based on statistical features,” IEEE Transactions on Vehicular Technology, vol. 66, no. 5, pp. 4110–4119, 2016, doiI: 10.1109/TVT.2016.2620523.
[8] Y. J. Chun, S. L. Cotton, H. S. Dhillon, A. Ghrayeb, and M. O. Hasna, “A stochastic geometric analysis of device-to-device communications operating over generalized fading channels,” IEEE Transactions on Wireless Communications, vol. 16, no. 7, pp. 4151–4165, 2017, doi: 10.1109/TWC.2017.2689759.
[9] X. Li, R. Shankaran, M. A. Orgun, G. Fang, and Y. Xu, “Resource allocation for underlay d2d communication with proportional fairness,” IEEE Transactions on Vehicular Technology, vol. 67, no. 7, pp. 6244– 6258, 2018, doi: 10.1109/TVT.2018.2817613.
[10] A. Abdallah, M. M. Mansour, and A. Chehab, “Power control and channel allocation for d2d underlaid cellular networks,” IEEE Transactions on Communications, vol. 66, no. 7, pp. 3217–3234, 2018, doi: 10.1109/TCOMM.2018.2812731.
[11] R. I. Ansari, C. Chrysostomou, S. A. Hassan, M. Guizani, S. Mumtaz, J. Rodriguez, and J. J. Rodrigues, “5g d2d networks: Techniques, challenges, and future prospects,” IEEE Systems Journal, vol. 12, no. 4, pp. 3970–3984, 2017, doi: 10.1109/JSYST.2017.2773633.
[12] A. Al-Hourani, S. Kandeepan, and E. Hossain, “Relay-assisted deviceto-device communication: A stochastic analysis of energy saving,” IEEE Transactions on Mobile Computing, vol. 15, no. 12, pp. 3129–3141, 2016, doi: 10.1109/TMC.2016.2519343.
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