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Register a new userImproving The performance of Multi-hop Wireless Ad-hoc Networksby applying network coding with virtual queues
تحسين أداء شبكات AD HOC اللاسلكية متعددة القفزات بتطبيق ترميز الشبكة مع الأرتال الافتراضية
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يعتبر ترميز الشبكة أحد الأبحاث الهامة في مجال الشبكات اللاسلكية متعددة القفزات، و يساهم إلى حد كبير في تحسين أداء هذه الشبكات، إذيستفيد من الطبيعة الإذاعية لعمليات الإرسال في هذه الشبكات لإرسال أكثر من رزمة في إرسال إذاعي واحد، لذا فإنه يحقق استفادة مضاعفة من عرض الحزمة المتوفر، مما يزيد من مردود الشبكة و يقلل من الازدحام. هدفنا في هذا البحث هو التحقق من التحسين الذي يقدمه ترميز الشبكة لأداء شبكات Ad Hoc اللاسلكية متعددة القفزات، و كذلك دراسة تسريع عملية البحث عن فرص الترميز من خلال بناء أرتال افتراضية بحسب مسارات الرزم التي تمر عبر العقد، و تطبيق طريقة فعالة لإدارة هذه الأرتال.
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 more 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.
References used
SARKAR, S.K. ; BASAVARAJU, T.G. ; PUTTAMADAPPA, C. “Ad Hoc Mobile Wireless Networks. Principles, Protocols, and Applications”. Taylor & Francis Group, 2008, pp.21-95
PELUSI, L. ; PASSARELLA, A. ; CONTI, M. “Encoding for Efficient Data Distribution in Multihop Ad Hoc Networks”, IIT-CNR, Pisa, Italy, 2009, pp.87-125
FRAGOULLI, C. ; SOLJANIN, E. “Network Coding Fundamentals”, Foundations and Trends in Networking, Vol. 2, No. 1, 2007,pp 1-133
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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.
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.
Localization is an essential process in many wireless sensors networks applications like environmental surveillance and forest fires detection, where sensors are usually randomly thrown in difficult to reach places, considering the limited wireless s
ensors capability in terms of energy availability and the capacity of computations a low cost and energy conservation algorithms are needed to determine the approximate position of the sensors. In this research a new algorithm was proposed ‘Address Vector Multi-Hop (AV_MH)’ to determine the position of the randomly deployed sensors, this algorithm is based on the idea of making benefit from short address assignment in networks that support hierarchical addressing, considering that the most important techniques used in the field of sensor networks such as ZigBee and 6LowPAN which depend on the IEEE802.15.4 standard support this type of addressing.
The results showed the possibility of obtaining an approximate position of the wireless sensors in a rapid and inexpensive and cost-effective way in terms of the number of sent messages and required calculations.
Mobile Ad-Hoc Networks are used for data transfer. The nodes of such
networks do not require presetting. They are characterized by dynamic
data transfer during their movement of the nodes. MANET could be
targeted by potential security breaches. Bl
ack hole attack is one of the
serious attacks targeting wireless AD_HOC networks through a false
point whichcan absorb data and send them to another place or neglect
them. This is due to the lack of central control node which is able to
manage communications. This research investigates the effects of the
black hole on the performance of hybrid routing protocol Temporally
Ordered Routing Algorithm (TORA) and proactive routing protocol
Optimized Link State Routing (OLSR) for a variable number of mobile
nodes in different speeds in a high load environment.
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 usi
ng
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).
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