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التعاون بين المحطات القاعدية في نظم الاتصالات النقالة المتقدمة
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Publication date
2013
and research's language is
العربية
Created by
Editor007 Shamra
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يعتبر التعاون بين المحطات القاعدية في نظم الاتصالات النقالة الحديثة من مثل LTE أو (Long-Term Evolution) وكذلك LTE-Advanced (4G) من أهم التقنيات التي تسمح بتحسين التغطية ونوعية الخدمة المقدمة للمستخدمين. يهدف هذا البحث إلى اقتراح خوارزميات عملية للتعاون بين المحطات القاعدية على الوصلة الهابطة (Downlink) في هذا النوع من الأنظمة وسبر أداء هذه الخوارزميات من خلال بعض نتائج المحاكاة. تعتمد الخوارزميات المقترحة على إعادة الإرسال الهجين (HARQ: Hybrid Automatic Repeat reQuest) بناءً على قرار مشترك بين المحطات المتعاونة يُتخذ في ظل معرفة معينة عن حالة القنوات اللاسلكية. تقدم إعادة الإرسال الموزعة، أي المعتمدة على التعاون، أداءً أفضل من حيث معدل الخطأ على المعطيات والتأخير الزمني لإيصالها بشكل صحيح، وذلك مقارنةﹰ بإعادة الإرسال من محطة واحدة بدون تعاون.
No English abstract
References used
Erik Dahlman, Stefan Parkvall, Johan Sköld, “4G LTE/LTE-Advanced for Mobile Broadband”, Elsevier Ltd, 2011.
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يهدف هذا البحث إلى اقتراح خوارزميات عملية للتعاون بين المحطات القاعدية على الوصلة الهابطة
(Down Link) في هذا النوع من الأنظمة وسبر أداء هذه الخوارزميات من خلال بعض نتائج المحاكاة.
Although Multi-Input-Multi-Output MIMO improve reliability of wireless
transmission system and increase bit rate, but this improvement relay on higher cost in
Hardware and increase in size as well as complex structure, so the cost-effective challen
ge
still exists to implement these technique.
Performance can be improved without increasing the cost significantly by using
virtual MIMO systems where the spacing is achieved by using pre-existing devices within
the network infrastructure, these systems called cooperative communication systems,
which are the subject of this research.
The simulation is based on standard software for modeling MATLAB and open
sourced Network simulator-3 (NS-3) to characterize problems in wireless communications
systems and propose appropriate solutions.
The purpose of this study is to offer help to patients through the employment of
databases applications of existing and available telecommunication systems in medical
services ,particularly treatment. So that it can be possible to avoided what can
be avoided
of health disasters that a human being encounter without warning. This study examines
how modern technologies can be employed in controlling and processing some vital signs
of human beings,particulary those who suffer some health problems affiliated with some
diseases ,and keeping these problems under control in order to maintain the stability of the
patients health statues.
The vital signs that the study is applied to are blood pressure, pulse and blood
glucose, since any of change in the value of any of these signs, positive or negative, may
cause the patient to have a sudden health problems.
شبكات الحساسات اللاسلكية
العلامات الحياتية
شبكات الحساسات اللاسلكية الحيوية
بروتوكول التوجيه بالزمن الحقيقي
استدعاء الطرق عن بعد
Vital signs
(WSN (wireless sensor networks
(WBSN (wireless body sensor networks
RTLD (Real-time with load distributed routing) Protocol
(RMI (Remote method invocation
المزيد..
Mobile wireless networks consist of a set of cooperative and
mobile nodes, each node can move randomly at a specific speed
in all directions without any control of a central manager. This type
of networks has become a hot research topic due to its
military
application and suitability for emergencies and natural disasters.
Due to the lack of fixed infrastructure, the routing process
becomes the major problem in this type of networks, where the
responsibility of routing is transferred to each node. Over the last
few years, a number of traditional routing protocols has been
proposed, but these protocols do not support quality of service in
different environments.
Some studies have improved some of these protocols to support
quality of service for specific environments. This research
identifies and analysis some of these improved protocols.
The modern techniques of the information systems are considered as one of the most
important tools, that most institutions, bodies and organizations working in the areas of
planning and future development are seeking to use as effective analytical
and technical
tools for collecting and analyzing the vast amount of spatial and descriptive information
and the data of the human and natural phenomena, for both planners or decision-makers, at
the various stages of the planning process to cope with the urgent urban problems in
addition to supporting the completion of development plans in record time and high
quality, and reduce waste in energies and resources.
In this context, the research displays the advanced analytical techniques and tool, and
their role in whole planning processes, and identifies the methods of application of GIS
systems as the most efficient and widely used system in the fields of urban planning and
land use, and in developmental decisions support. Also, the research presents a practical
model for the distribution of tasks within the departments and institutions involved in the
planning, to introduce the information systems in their work, and highlights the most
important obstacles that may face the use of those systems.
The study comes up with a number of conclusions and recommendations for the
potential application of advanced techniques and avoiding obstacles, which directly
contribute to raising the efficiency and effectiveness of planning processes, and
improving the planning process management.
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