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Register a new userStudying the performance and the Efficiency of random linear network coding in achieving the reliable transfer of data in losing wireless networks
دراسة أداء و فعالية ترميز الشبكة الخطي العشوائي في تحقيق النقل الموثوق للبيانات في الشبكات اللاسلكية ذات الضياع
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تعاني الشبكات اللاسلكية من الضياع المتكرر للرزم لأسباب عديدة منها التداخلات و التصادم و الخفوت، مما يجعل من الوسط اللاسلكي وسط غير موثوق لنقل البيانات. أبرز طرق ضمان وثوقية النقل عبر هذا الوسط هي باستخدام بروتوكول التحكم بالنقل (TCP) و بروتوكول إعادة الطلب التلقائي (ARQ). مؤخراً وجد ترميز الشبكة كتقنية جديدة تغير من طريقة التوجيه التقليدية (خزن-وَ-وجه) في الشبكات إلى طريقة أكثر ذكاءً و فعالية هي (رمز –وَ-وجه)، مما يسهم في زيادة سعة و إنتاجية النقل لهذه الشبكات. تم في هذا البحث استخدام ترميز الشبكة الخطي العشوائي كتقنية واعدة تهدف إلى تحقيق النقل الموثوق للبيانات في الشبكات اللاسلكية ذات الضياع، و كذلك دراسة التحسين الذي تقدمه لأداء هذه الشبكات بحالتي الإرسال الوحيد و المتعدد. لتقييم فعالية هذه التقنية و مقارنة أدائها مع أداء بروتوكولات النقل الموثوق تم استخدام محاكي الشبكات NS3. و قد بينت نتائج المحاكاة تحقيق ترميز الشبكة الخطي العشوائي عملية النقل الموثوق للبيانات بإنتاجية أكبر و تأخير زمني و عدد عمليات إرسال أقل مقارنة بالبروتوكولين (TCP، ARQ).
Wireless networks suffer from frequent loss of packets for many reasons such as interference, collision and fading. This makes wireless medium unreliable medium for data transfer. The main methods for ensuring the reliability in this medium are using transmission control protocol (TCP) and the automatic repeat request (ARQ). Recently, network coding has been found as new technology that changes the traditional forwarding method (Store- and- Forward) in the networks to more effective and intelligent method (Code- and- Forward), which contributes to the increase of both capacity and throughput of these networks. In this research, random linear network coding is used as promising technology that aims to achieve the reliable transfer of data in losing wireless networks, and studying the enhancement that this technology presents to the performance of these networks in unicast and multicast transmission. For evaluating the efficiency of this technology and comparing its performance with the performance of reliable transfer protocols, we use the networks simulator (NS3). Simulation results showed that random linear network coding achieve the reliable transfer of data with bigger throughput and less delay and number of transmission compared with the protocols (TCP, ARQ).
References used
Andrea Goldsmith, ―Wireless Communication‖, Cambridge University Press, 1st South Asian Edition 2009
P. Bhagwat, P. P. Mishra, and S. K. Tripathi, ―Effect of topology on performance of reliable multicast communications,‖ in Proc. IEEE INFOCOM, Toronto, Canada, June 1994, pp. 602–609
B. Sardar and D.Saha," A survey of TCP enhancements for last-hop wireless networks," IEEE. Surveys and Tutorials, Vol. 8, pp. 20-34, 2006
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Random Linear Network Coding (RLNC) is considered to be one of the promised
solutions to achieve the reliability of transmission in multi hop wireless networks, Since it
is based on correcting the loss of the packets in the medium through the conti
nuity of
transmitting coded packets from each segment until receiving acknowledgment of getting
the required number of these packets for decoding. However, because of the nature of
wireless medium and multi hops transfer, a loss or delay of the ACK may occur, which
causes transmitting extra packets and time delay to the next segments, consequently
decreasing the throughput of these networks.
In this research, we propose a new transmission mechanism for reliable transfer in
multi hops wireless networks through using the concepts of sliding window and fast
retransmit with RLNC, for transmitting packets of consequent segments in specific
continues flow and fast correcting the loss in these segments. Simulation results show that
proposed mechanism decreases the time delay for transmission process and increases the
transfer throughput of these networks.
Multi hop wireless networks face many challenges basically the
limitation of bandwidth, loss of packets because of many problems
in wireless medium also loss of paths because of the random and
unpredictable movement of wireless nodes, which reduce
the
performance of these networks. Recently, Network coding has been
used as promising technology that achieves the reliable transfer of
data in wireless networks with high throughput. Considering the
efficiency of this technology and with benefiting from both the
same cost paths and the broadcasting property of wireless medium,
a multi transmission mechanism for random linear network coding
has been proposed in multi hop wireless networks, which depends
on multicasting of coded packets on the same cost paths.
Network coding isone of the important researches in multi-hop wireless networks domain
and it widely participates in improving the performance of these networks, since it benefits from
the broadcasting nature of transmission processes to transmit m
ore than single packet in one
broadcasting transmission. So it achieves double use of the available bandwidth, which can
increase the throughput of the network and reduce the congestion.Our aim in this research is to
verify the improvement that network coding presents to theperformance of multi-hops wireless
Ad-hoc networks, and to study the accelerating of research process for coding chances through
constructing a virtual queues according to the packets flows that pass the node, and applying
affective manner to manage this queues.
Ad-hoc networks has opened a new dimension in wireless networks. It allows
wireless communication in the absence of central support of the contract. In these
networks, there are no fixed infrastructure because the mobile nodes are continuously
mak
ing continuous and dynamic change in the topology.
Routing protocols of mobile ad-hoc networks differ from the existing internet
protocols which are designed for the fixed structure based wireless networks. MANET
protocols have to face high challenges due to dynamically changing of topologies, low
transmission power and asymmetric links. Due to link instability, node mobility and
frequently changing topologies routing becomes one of the core issues in MANETs.
Currently existent routing protocols provide routing solutions up to a certain level
and most of them are designed and implemented in small areas. Many researchers are still
working on the developments of MANET routing protocols.
With the increase in the types of routing protocols used in mobile network it has
become necessary to study the effectiveness of each type of protocols In this papper we
compared between the most famous species (proactive, Reactive, hybrid) and choose a
protocol to be representative of all species previously mentioned and the network
performance assessment each type in terms of Throughput, dynamic routing routing, load,
delay and determine which of these protocols appropriate for each case.
Mobile Wireless Sensor Network (MWSN) is an emerging technology for attraction of
researchers with its research advantage and various application domains. Due to limited
resources of sensor nodes such as transmission power, communication capability
and
size of memory, data aggregation algorithms are the most practical technique that reduces
large amount of transmission in this network. Security is an important criterion to be
considered because, wireless sensor nodes are deployed in a remote or hostile
environment area that is prone to attacks easily. Therefore, security are essential issue
for MWSN to protect information against attacks.
In this research, we offered an algorithm of secure data aggregation in MWSN based on
pair-wise keys technology and hash function. We studied important parameters such as
execution time, end-to-end delay and number of storied keys. Results showed that
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