ارائه روشی برای دریافت داده‌ی حسگر بی‌سیم توسط مشتری وب از طریق دروازه اینترنت اشیاء مبتنی بر پروتکل CoAP
محورهای موضوعی : مهندسی برق و کامپیوتر
محمدرضا نیک‌سرشت
1
,
حميد حاج سيدجوادي
2
,
مهدی ملامطلبی
3
*
1 - دانشگاه آزاد اسلامِی واحد بوئین زهرا
2 - دانشگاه شاهد
3 - دانشگاه آزاد اسلامی بوئین زهرا
کلید واژه: اینترنت اشیاCoAPLoWPAN6چندگامیمصرف انرژی215.4IEEEکاهش ترافیکتجمیع,
چکیده مقاله :
پیشرفت فناوری در حوزه شبکه‌های حسگر بی‌سیم و امکان استفاده از پروتکل اینترنت در اشیای کوچک با منابع محدود (مانند حسگرها)، چشم‌انداز اینترنت را تغییر داده است. نحوه تعامل و روش‌های تبادل اطلاعات یکی از چالش‌های دنیای اینترنت اشیا است. استانداردهای LoWPAN6 و CoAP جهت استفاده از پروتکل‌های تحت وب در شبکه‌های حسگر پراتلاف و کم‌توان (LLN) ارائه شده‌اند. پشته پروتکل LoWPAN/CoAP6 دسترسی به شبکه حسگر را از طریق پروتکل‌های وب امکان‌پذیر می‌کند. این امر، توسعه برنامه‌های کاربردی روی شبکه حسگر و دسترسی به آنها توسط اینترنت را تسهیل می‌نماید. هر کدام از لایه‌های پشته پروتکل LoWPAN/CoAP6، میزانی سربار بر پیام‌های تبادل‌شونده تحمیل می‌کنند و سربار داده ناشی از آن، در شبکه‌های چندگامی، مصرف انرژی را تشدید می‌کند. در این مقاله، روشی جهت کاهش سربار تحمیلی به بسته‌های کوچک و متوسط در شبکه‌های چندگامی مبتنی بر LoWPAN/CoAP6 با استفاده از زمان‌بندی و تجمیع بسته‌های CoAP روی گره‌های حسگر آمده است. جهت حصول اهداف تحقیق، تمهیداتی نظیر رده‌بندی درخواست‌ها/ پاسخ‌های CoAP از لحاظ اولویت ارسال در شبکه (مشخص‌سازی حداکثر تأخیر مجاز)، مدیریت زمان‌بندی و تجمیع پیام‌های دریافتی روی گره‌های حسگر (بر اساس حداکثر تأخیر مجاز هر کدام) و بازشدن پیام‌های تجمیع‌شده در مقصد انجام گرفته است. نتایج ارزیابی روش پیشنهادی، حاکی از کاهش مصرف انرژی و ترافیک شبکه برای کاربردهایی نظیر نظارت در شبکه‌های چندگامی مبتنی بر پشته پروتکل LoWPAN/CoAP6 است.
The advancement of technology in the area of wireless sensor networks and the ability to use the Internet Protocol in small objects with limited resources (such as sensors) has changed the Internet landscape. How to communicate and how to exchange information is one of the challenges of the Internet world of things. 6LoWPAN and CoAP standards for using web protocols in low-loss and low-power sensor networks (LLNs) are presented. The 6LoWPAN / CoAP protocol stack allows access to the sensor network through web protocols. This will facilitate the development of applications on the sensor network and access to them by the Internet. Each layer stack of the 6LoWPAN / CoAP protocol imposes overhead on interchange messages, and data overload in multichannel networks exacerbates energy consumption. In this paper, a method for reducing the overhead imposed on small and medium packets in multi-step networks based on 6LoWPAN / CoAP is presented using the scheduling and aggregation of CoAP packets on sensor nodes. In order to achieve the research objectives, measures such as the classification of CoAP requests / responses in terms of network priority (maximum allowed delay detection), scheduling and aggregation of incoming messages on sensor nodes (based on the maximum allowed delay of each), and opening messages aggregated in the destination , It has been done. The evaluation results of the proposed method indicate a reduction of energy consumption and network traffic for applications such as monitoring, in multi-step networks based on the 6LoWPAN/ CoAP protocol stack.
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