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نوع الوثيقة : مقال في مجلة دورية 
عنوان الوثيقة :
تحسين تقنيات الاستشعار اللاسلكي
Sensors Lifetime Enhancement Techniques in Wireless Sensor Networks
 
الموضوع : علوم حاسب الي 
لغة الوثيقة : الانجليزية 
المستخلص : Wireless Sensor Networks are basically used for gathering information needed by smart environments but they are particularly useful in unattended situations where terrain, climate and other environmental constraints may hinder in the deployment of wired/conventional networks. Unlike traditional networks, these sensor networks do not have a continuous power supply at their disposal. Rather the individual sensors are battery operated and the lifetime of the individual sensors and thus the overall network depend heavily on duty cycle of these sensors. Analysis on WSNs shows that communication module is the main part which consumes most of the sensor energy and that is why energy conservation is the major optimization goal. Since routing protocols and MAC protocols directly access the communication module therefore the design of protocols in these two domains should take into account the energy conservation goal. In this paper, we discuss different state-of-the-art protocols both in MAC and routing domains that have been proposed for WSNs to achieve the overall goal of prolonging the network lifetime. The routing protocols in WSNs are generally categorized into three groups – data centric, hierarchical and location-based but we focus on only the first two categories because location-based routing protocols generally require a prior knowledge about sensors location which most of the times is not available due to random deployment of the sensors. We then discuss how schedule-based and contention-based MAC protocols can contribute to achieve optimal utilization of the limited energy resource by avoiding or reducing the chances of collisions and thus the need for retransmission. 
ردمد : 2151-9617 
اسم الدورية : JOURNAL OF COMPUTING 
المجلد : 2 
العدد : 5 
سنة النشر : 2010 هـ
2010 م 
نوع المقالة : مقالة علمية 
تاريخ الاضافة على الموقع : Wednesday, June 2, 2010 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
د.سامي حلوانيHalawani, Dr. Sami باحثدكتوراهhalawani@kaau.edu.sa

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