بهبود کیفیت سرویس دسترسی به کانال با زمان‌بندی کاربردهای مبتنی بر اینترنت اشیا

عابدی, امید; قزوینی کر, مهدیه; قدسی, فاطمه

بهبود کیفیت سرویس دسترسی به کانال با زمان‌بندی کاربردهای مبتنی بر اینترنت اشیا

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ استادیار گروه مهندسی کامپیوتر، دانشگاه شهید باهنر، کرمان، ایران

² دانشیار گروه مهندسی کامپیوتر، دانشگاه شهید باهنر، کرمان، ایران

³ دانشجوی کارشناسی ارشد مهندسی کامپیوتر، دانشگاه شهید باهنر، کرمان، ایران

چکیده

در سالهای اخیر پیوسته با افزایش دستگاههای اینترنت اشیا در زمینههای سلامت، کشاورزی، صنعت و دیگر کاربردها روبرو هستیم، آنچنان که بهبود کیفیت سرویس هنوز از الزامات این شبکهها است. معمولاً تولید داده توسط حسگرهای اینترنت اشیا به‌صورت ناهمگن در زمانهای مختلف با اندازه و اولویتهای متفاوت هستند، در این مقاله باهدف بهبود کیفیت سرویس، ارسال به‌موقع بستههای حساس به تأخیر و همچنین عدم گرسنگی بستههای با اولویتهای پایینتر، یک معماری شامل دو بخش اولویتبندی ارائه شده است. در بخش اول، انتخاب بسته جهت ارسال بر اساس یک نوع اولویتبندی پویا و نسبت به مهلت تأخیر آن بسته انجام میگردد. ازآنجاکه در این مقاله کاربرد اینترنت اشیا در مراقبت سلامت در نظر گرفته شده است و حسگرها هم به‌صورت دورهای (ثابت) و هم بر اساس ضرورت (بحرانی) داده تولید میکنند: بنابراین بر اساس ویژگی بار کاری، در این بخش از دو مدل صف D/G/1 و M/G/1 استفاده میشود. بخش دوم نیز شامل اولویتبندی کانال است. در این بخش با استفاده از یک کانال کنترلی و تنظیم زمان انتظار گره فرستنده برای گوش‌دادن به کانال، ارسال بسته از طریق کانال مجاز را داریم. علاوه بر این از یک مدل پرش کانال تلفیقی نیز برای استفاده گرهها از پهنای باند موجود استفاده شده است. همچنین یک بافر برای نگهداری اطلاعات آخرین ارتباط گره، کمک میکند تا ارسال و دریافت سریعتر با تعداد سوئیچینگ کمتر انجام شود. پس از شبیهسازی و مقایسه این مدل با استاندارد 11/802 و پروتکلهای دسترسی به رسانه مشابه، شاهد بهبود قابل‌توجهی در افزایش نرخ تحویل بسته، نرخگذردهی و همچنین کاهش تأخیر انتها به انتها هستیم.

کلیدواژه‌ها

20.1001.1.20086849.1403.15.2.5.4

عنوان مقاله [English]

Improving Channel Access QoS using Application Scheduling in Internet of Things

نویسندگان [English]

Omid Abedi ¹
Mahdieh Ghazvini kor ²
Fatemeh Ghodsi ³

¹ Computer, Engineering department, Shahid Bahonar university of Kerman, Kerman, Iran

² Computer, Engineering, Shahid bahonar university of Kerman, Kerman, Iran

³ Compute engineering, Shahid Bahonar University of Kerman, Iran

چکیده [English]

In recent years, we are constantly facing the increase of Internet of Things devices in the fields of health, agriculture, industry and other applications. The using of these networks will increase by improving the quality of service. Usually, data are generated heterogeneously by IoT’s sensors at different times with different sizes and priorities, and none of previous works in this field do not consider all these modes together; on the other hand, these studies either have worked on the queue model and priority package selection, or on the channel access methods and its prioritization. Therefore, in our proposed model in this paper, with the aim of improving quality of service, thight scheduling of delay-sensitive packets, and also avoiding starvation for lower priority packets, we consider an architecture including two levels of prioritization. In the first level, the packet is selected for sending based on a type of dynamic prioritization and relative to its delay deadline field. Since in this paper the application of Internet of Things in health care is considered, the sensors generate data both of modes, periodically (fixed) and on demand (critical), and therefore, two queue models D /G/1 and M/G/1 are used. In addition, the second level includes channel prioritization. At this level, by using a control channel and setting the waiting time of the sending node for listening to the channel, we have sending the packet through the control channel. Furthermore, a consolidated channel hopping model has been used for nodes to use the available bandwidth. Also, a buffer to keep the information of the last connection of the node helps to send and receive faster with less number of switching. After simulating and comparing this model with the 802.11 standard and similar media access protocols, significant improvements in increasing the packet delivery rate, operational throughput, and also reducing the end-to-end delay are showed.

کلیدواژه‌ها [English]

Internet of Things
Channel Access QoS
Scheduling
Dynamic Prioritization

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