Efficient RTS and CTS Mechanism Which Save Time and System Resources

It is a well-known fact that the forthcoming names are distinctively different: interference range, career sense, and transmission. The given paper reveals the underlying study of disengagement of a request to send (RTS)/ clear to send (CTS) dialog. It was basically adopted under the influence of both; the presence of distributed coordination function of IEEE 802.11 and a sub-layer protocol which is called media access control (MAC) protocol. The demonstration was seen when applying a type of traffic flows such as Constant Bit Rate (CBR), Transmission Control Protocol (TCP), and besides User Datagram Protocol (UDP). When these are applied the output performance in term of throughput shows a very linear topology configuration of the network. To sum up, a new RTS /CTS mechanism was proposed based on the results obtained from the above suggestions. The detailing for the new mechanism showed that a terminal node will be responsible for deciding if it is authorized to use an RTS/CTS protocol dialog to send one of its packets or not. Needless to say, this process will be dynamic in nature.

Analisis Kinerja Protokol Routing AODV Single Path dan Multipath Pada Jaringan IEEE 802.15.4/ ZIGBEE

Routing protocol is used to keep the stabilization of connection. Its connected with the performance was caused good communication when the communication from the source node to the destination node. The main factor of success in routing protocol techniques was quality of service to provide the difference level of service in arraging and giving the traffic service prority in the the network like constant bit rate (CBR) and file transfer protocol (FTP) using wireless network sensor network (WSN).This research will analyse the achivement quality of service in IEEE 802.15.4/Zigbee network used routing protocol techniques ad hoc on demand distance vector (AODV) single path and multipath based on distance and number of nodes simulated used Cygwin software. Based on the results of tests performed using the technique of routing protocol Ad Hoc On Demand Distance Vector single path and multipath for service traffic with constant bit rate and file transfer protocol, the result packet delivery ratio and goodput better on the distance between nodes 10m than the distance between node 15m to 25m, thus indicating that the goodput affect the traffic services are used. And the average delay results using the technique of multipath routing protocol AODV lower, thus indicating that the alternative pathway suppress buffer traffic delay on the service used.

A-OLSR: ANFIS based OLSR to select Multi point relay

<span lang="EN-IN">The characteristics like dynamic topology, power consumption, mobility etc. may leads to affect the routing process of packet as it progresses from one node to another node. The energy of each node is very limited in MANET’s due to which it becomes an important parameter to be considered while selecting the route. The ‘Optimized Link State Routing Protocol’ (OLSR) does not consider node energy during Multipoint relay (MPR) selection process. This paper proposes an improvement of OLSR routing protocol named as A-OLSR protocol using node energy during its MPR process. The improvement is based on adaptive neuro fuzzy inference system (ANFIS). The network simulator NS2.35 is used for the simulation, random way point model for mobility and constant bit rate (CBR) for traffic process. The performance of proposed A-OLSR protocol is evaluated using the packet delivery ratio (PDR) and end to end delay metrices. The simulation results prove the superiority of the proposed protocol in terms of PDR.</span>

Analisis Kinerja Protokol Routing AODV Single Path dan Multipath Pada Jaringan IEEE 802.15.4/ ZIGBEE

Routing protocol is used to keep the stabilization of connection. Its connected with the performance was caused good communication when the communication from the source node to the destination node. The main factor of success in routing protocol techniques was quality of service to provide the difference level of service in arraging and giving the traffic service prority in the the network like constant bit rate (CBR) and file transfer protocol (FTP) using wireless network sensor network (WSN).This research will analyse the achivement quality of service in IEEE 802.15.4/Zigbee network used routing protocol techniques ad hoc on demand distance vector (AODV) single path and multipath based on distance and number of nodes simulated used Cygwin software. Based on the results of tests performed using the technique of routing protocol Ad Hoc On Demand Distance Vector single path and multipath for service traffic with constant bit rate and file transfer protocol, the result packet delivery ratio and goodput better on the distance between nodes 10m than the distance between node 15m to 25m, thus indicating that the goodput affect the traffic services are used. And the average delay results using the technique of multipath routing protocol AODV lower, thus indicating that the alternative pathway suppress buffer traffic delay on the service used.

Implementando cenários em redes de computadores com Network Simulator (NS-2): uma abordagem prática

Este artigo tem como objetivo apresentar um estudo referente ao conceito de Qualidade de Serviço (QoS) em cenários típicos de tráfego inelásticos, ou seja, sensíveis às alterações das condições da rede e que se encontram representados neste trabalho por aplicações com uma taxa de bits constante ou do tipo Constant Bit Rate (CBR). Para ilustrar estes cenários, a ferramenta de simulação de redes, NS-2, foi empregada e, por intermédio da consulta em fontes primárias, secundárias e sítios da internet foram investigados os conceitos que envolvem a QoS. Após a análise dos gráficos gerados com as métricas de desempenho, como vazão, jitter e perda de pacotes, foi possível identificar a diferença entre uma rede de melhor esforço e uma rede com QoS implementada.

Survey of Routing Protocols under Realistic Mobility and Traffic

Mobile ad hoc networks are a dynamic and unpredictable community topology. There are numerous routing protocols that have been proposed for MANETs. Maximum pervious research centered on improving the present routing protocols or designing new routing algorithms. In our work, we investigated and compared the effect of mobility models on routing protocols for various site visitors instructions in MANETs. There have been many factors that affected the overall performance of routing protocols which include mobility and visitors styles. We designed several simulation models that added these factors together and measured the software performance in terms of end -to-end throughput (bit rate), latency, and jitter. three instructions of MANET routing algorithms (Proactive, Reactive, and Hybrid), mobility models (Random Waypoint and group), and three instructions of visitors styles (constant bit rate, variable bit rate, and random) have been used.

QoS Improvement using DRAODV under Variable Transmission Range in MANET

A mobile ad hoc network (MANET) may be a self-configured, infrastructure-less network of mobile nodes that move independently. Owing to this movement, links can change often and can require special routing techniques to handle this. Every node acts as an intermediate router to receive and transmit packets. in this paper, the impact of varying transmission range on different propagation model and queue model on 3 routing protocols specifically AODV, DSR and DYMO is analyzed. The simulations were done on Qualnet. The significant metrics used for comparative analysis are- throughput, end-to-end delay and average jitter. The nodes of designed scenario communicate all the way through constant bit rate (CBR) application traffic. It is found that AODV is best performer under CBR traffic for MANET nodes operated through Okumura Propagation Model with queue technique as well as DYMO performs well in free space propagation model using queuing technique. This paper also summarize as the node density increases in network throughput performance decreases. Further in this paper DRAODV routing protocol is designed and implemented in order to improve the QoS over AODV routing protocol under variable transmission range.