|1. PaperID 001: A Novel method to increase TCP throughput in wireless sensor networks
(pp. 1-5) | Fulltext|
Bahonar university, Iran
Abstract— As the time is spent, the use of wireless network application is becoming more often. There are many organization,instituitions, factories, etc. that use wireless network as their primary infrqastructure requirement. Today almost all of the everyday life of human, whitout these technology, cannot be done. But efficient use of any technology is vital and wireless network is not an exemption from this rule. As it is obvious that in every technologyes the related protocol stack has many protocols and each one does special task at each layer. Transport layer in networking has a significant protocol that is called Transport Layer Protocol (TCP). TCP is a connection-oriented protocol which is responsible for reliable transmission. Noisy nature of wireless networks and lower layer tasks cause TCP flows, have a lower throughput that their wired counterparts. In this paper, a new method is proposed to enhance total TCP throughput and it is proved that this method has a better throughput than the connection division method. “Unfairness” between connection flows is a common phenomena in the wireless networks. Wireless links are more unreliable than the wired ones. The connection is extremely unstable and it may drop quite often. It has less compatibility than wired network. TCP as a transport layer protocol has been frequently from these characteristics of wireless lan . In the real world, TCP is deployed for wired networks and it has less throughput in wireless networks rather than the wired networks. Because, when a segment is lost, TCP assumes that a congestion is happened in the network and thus may use congestion control mechanisms to remove the problem. But in wireless network losing a packet may be due to mobility, wrong channel assignment, which causes segment move to wrong path fading, etc. teghother with congestion. Hence finding a utilized method to enhance the TCP performance in wireless lan is very important. In this paper, we propose a new method to improve the throughput of TCP flows. It is simulated by NS2 in our earlier research. Many researchers presented many algorithm to overcome this phenomena. The advantage of the new model is discussed and compared with [1,2,13].
Keywords- Short term flows, TCP, Wireless LAN, Throughput wireless sensor networks, TCP, throughput
2. PaperID 002: enhance performance in 802-11 WLAN (pp. 6-10) | Fulltext|
Hamid GHolami Orimi
University of applied Science and Technology, Iran
Abstract—Growth in the use of wireless technologies is a good evidence for the increasing popularity of wireless networks.Wireless local area networks based on the IEEE 802.11 standard are popular wireless technologies to access the internet .WLAN, as a new wireless network has been designed to improve the performance of the new communications. TCP supportsmany applications on the internet due to its reliable data delivery ability. Development of new wireless networks like 802.11based wireless networks makes it essential to improve TCP’s Performance. Self-collision is found as an important issue which plays a key role in the observed throughput degradation. It causes increased RTT and growth of TCP window size is stop, consequently, throughput is decreased. In this paper, a simulation based performance analysis is presented during the term of TCP throughput. The throughput delay of TCP is evaluated in a mixed wired and 802.11 based WLAN and discuss self-collision problem which causes this degradation. a novel method is proposed to solve the problem by offering higher priority to frames containing TCP ACK packets in the MAC layer. Simulation results indicate proposed model enhances TCP throughput.
Keywords: TCP, self-collision, WLAN, throughput
3. PaperID 003: Failure Tolerance for Self-Healing in wireless sensor network(11-18)
| Abstract | | Fulltext|
Qazvin branch ,Islamic azad university , Iran
Abstract—Some WSN by a lot of immobile node and with the limited energy and without further charge of energy. Whereas extension of many sensor nodes and their operation. Hence it is normal unactive nodes miss their communication in network, hence split the network. For avoidance split of network, we proposed a fault recovery corrupted node and Self Healing is necessary. In this paper, we design techniques to maintain the cluster structure in the event of failures caused by energy-drained nodes. Initially, node with the maximum residual energy in a cluster becomes cluster heed and node with the second maximum residual energy becomes secondary cluster heed. Later on, selection of cluster heed and secondary cluster heed will be based on available residual energy. We use Matlab software as simulation platform quantities. Like, energy consumption at cluster and number of clusters is computed in evaluation of proposed algorithm. Eventually we evaluated and compare this proposed method against previous method and we demonstrate our model is better optimization than other method, in energy consumption rate.
Keywords: Self Healing, Cluster Head, fault, recovery..
4. PaperID 004: performance analysis of sensor traffic detector (pp. 19-24) | Fulltext|
Mohanna farzin, Adel Ramezani
Islamic azad university, siyahkal center,lahijan,Iran
Abstract—Sensor networks is considered today as one of the scientific debate. Traffic control is a significant application using WSN. Intelligent Transportation System (ITS) involves a range of new tools for managing transport networks and services to the passengers. The benefits of ITS can reduce accidents, help reduce traffic congestion, control and protection of the environment, saving manpower, eliminate human errors, increase efficiency and operating performance noted. Wireless sensor networks, is proposed to improve the efficiency of transport systems. Collect traffic statistics for traffic planning and management, mainly using the sensor cable is hanging. Time-consuming maintenance and installation of intelligent equipment, preventing continuous review and control traffic. In this paper, we first review of the architecture and structure of the sensor network, and then in the fundamental principles of traffic control and traffic controls will be using a sensor network as well as a brief description of a few scenarios that uses network traffic the sensor can be prevented accidents, are presented.
5. PaperID 005: Bandwidth Allocation in WiMAX Networks Using Learning Automaton (pp. 37-46) | Fulltext|
Saeid.M.Jafari, Majid Taghipoor
Abstract– Recent developments on the wireless communication technology have brought much innovativeness to make wireless access networks, e.g. WiMAX systems, to be able to compete with the wired access networks with much more bandwidth. QoS service provisioning is an important issue for deploying such networks. The IEEE 802.16d standard has specified the services should be provided at the medium access control (MAC) layer in WiMAX networks. However, it has left a wide space for research to develop and implement those specified services. In this paper, the issue of differentiated service provisioning will be addressed with the non-real-time polling service in WiMAX systems. The proposed solution has been designed to have an ability to accommodate integrated traffic in the networks with effective scheduling schemes. A series of simulation experiments have been carried out to evaluate the performance of the proposed scheduling algorithm. In our algorithm we introduce a two-phase Learning Automaton queuing (2PLAQ) algorithm tailored for uplink scheduling in the WiMAX network. It aims to strike the balance between delay requirement and fair bandwidth allocation. The results reveal that the proposed solution performs effectively to the integrated traffic composed of messages with or without time constraints and achieves proportional fairness among different types of traffic.
Keywords: WiMAX; scheduling; Learning Automaton; Bandwidth Allocation.