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Register a new userEnhancing the Performance of Multi Hop Wireless Networks using Network Coding Based on Multicast Transmission on Same Cost Paths
تحسين أداء الشبكات اللاسلكية متعددة القفزات باستخدام ترميز الشبكة المعتمد على الإرسال المتعدد على المسارات المتساوية الكلفة
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تواجه الشبكات اللاسلكية متعددة القفزات تحديات أساسية أبرزها محدودية عرض الحزمة، ضياع الرزم بسبب مشاكل عديدة في الوسط اللاسلكي و فقد المسارات بسبب الحركة العشوائية و غير المتوقعة للعقد اللاسلكية، مما يقلل من أداء هذه الشبكات. مؤخرًا، استخدم ترميز الشبكة كتقنية واعدة تحقق النقل الموثوق للبيانات في الشبكات اللاسلكية بإنتاجية عالية. انطلاقاً من فعالية هذه التقنية و بالاستفادة من المسارات متساوية الكلفة و من الخاصية الإذاعية للوسط اللاسلكي، تم اقتراح آلية إرسال متعددة لترميز الشبكة الخطي العشوائي في الشبكات اللاسلكية متعددة القفزات، تعتمد على الإرسال المتعدد للرزم المرمزة على المسارات المتساوية الكلفة.
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.
References used
Aguayo D, Bicket J, Biswas S, Judd G, Morris R. 2004 Linklevel measurements from an 802.11b mesh network, In: Proceedings of the 2004 conference on applications, technologies, architectures, and protocols for computer communications (SIGCOMM), vol. 34. New York: ACM, 121_132
Jain S, Das S. 2005 Exploiting path diversity in the link layer in wireless ad hoc networks. In: World of wireless mobile and multimedia networks (WoWMoM). Piscataway: IEEE, 22_30
Ahlswede R, Cai N, Shuo-Yen, Li R, Yeung RW. 2000 Network information flow. Information Theory 46(4):1204_1216. DOI 10.1109/18.850663
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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.
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.
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).
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.
This research identifies
some improved protocols which support multiple paths between
source and destination.
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