International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02 | Feb -2017
www.irjet.net
e-ISSN: 2395 -0056 p-ISSN: 2395-0072
ANALYZING THE INTERACTION OF ASCENT WITH IEEE 802.11e MAC IN WIRELESS SENSOR NETWORK A.Sundar Raj1, S. Kavya2, K.G. Devi Priyanka3
Associate Professor, E.G.S. Pillay Engineering College, Nagapattinam, India1 drasr1982@gmail.com1 E.G.S. Pillay Engineering College, Nagapattinam, India2,3
kavyasadanandam@gmail.com2, priyankaganesh8383@gmail.com3
-------------------------------------------------------------***---------------------------------------------------------------Abstract— A wireless sensor network (WSN) consists of a number of sensors distributed in the sensor field. These sensors monitor physical or environmental conditions. In Adaptive Self-Configuring sEnsor Networks Topologies (ASCENT) the nodes can coordinate to exploit the redundancy provided by the high density, so as to extend overall system lifetime. When the nodes detect high message loss, it requests additional nodes in the region to join the network in order to relay messages. This reduces nodes duty cycle if it detects high message losses due to collisions. Due to dense deployment congestion becomes more common phenomenon from simple periodic traffic to unpredictable bursts of messages triggered by external events. Congestion causes huge packet loss and thus blocks reliable event perception. Congestion in wireless sensor networks causes packet loss, and thus also leads to excessive energy consumption. So we need to control congestion in WSN in order to prolong system lifetime. In order to reduce the congestion, we have implemented MAC layer 802.11e instead of CSMA. It is observed that the proposed scheme performs well in terms of packet delivery ratio, throughput and energy consumption. Keywords— Wireless Sensor Networks, ASCENT, Topology, MAC layer, Lifetime Improvement factor, NS2.
I. INTRODUCTION Wireless Sensor Network consists of large number of sensor nodes deployed either uniformly or randomly in the field. These nodes will always be wasting energy as they will be in active state. Hence the main goal is to put some of the sensor nodes in sleep state and some other nodes in active state. Battery life, sensor update rates, and size are all major design considerations in wireless sensor networks. Recent advances have resulted in the ability to integrate sensors, radio communications, and digital electronics into a single integrated circuit package, which reduces size and complexity of the node. This capability is enabling networks of very low cost sensors that are able to communicate with each other using low power wireless data routing protocols. A wireless sensor network consists of a base station that can communicate with a number of wireless sensors. Data is collected at the wireless sensor node, transmitted to the gateway directly or uses other wireless sensor nodes to forward data to the gateway. The transmitted data is then given to the system by the gateway connection. We have carried out an extensive survey on wireless sensor networks and topology management schemes [2],
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[6]. There are many topology management schemes for sensor network, like ASCENT, SPAN, BEES, STEM and GAF [1], [3], [9], [12]. They help the network to perform better by their management of controlling data packets, reducing energy consumption and so on. We also surveyed many congestion control schemes [8], [10], [11] to improve the topologies. In our work we have taken the ASCENT (Adaptive Self Configuring sEnsor Network Topologies) topology management scheme [1], which is an adaptive network topology for mobile network. It can dynamically choose ACTIVE nodes to send messages successfully in the network. In ASCENT the limitation is the packet loss due to congestion. Hence the energy consumed will be higher and throughput will be less. To overcome this we use IEEE 802.11e MAC layer and we analysis the performances like packet delivery ratio, system throughput and energy consumption and will be comparing ASCENT with CSMA. The paper is organised as follows, section II discusses the related work in topology of wireless sensor network, section III explains ASCENT, section IV explains the interaction of ASCENT with MAC 802.11e, in section V results and analysis are discussed and conclusion is given in the final section. II. RELATED WORK C. Wang et al have proposed Upstream Congestion Control in Wireless Sensor Networks through Cross-Layer Optimization [10]. In this congestion is classified as node level congestion and link level congestion. Node level congestion causes packet loss and queuing delay and this leads to retransmission, so consumes additional energy. Link level congestion increases service time which leads to decrease in both link utilization and overall throughput. In this Priority-based congestion control protocol (PCCP) is proposed. This employs packet based computation to optimize congestion control. Md. Mamun-Or-Rashid et al have proposed Reliable Event Detection and Congestion Avoidance in Wireless Sensor Networks [8]. Here congestion avoidance protocol [8] includes hierarchical medium access control (HMAC) and weighted round robin forwarding (WRRF) are proposed. In HMAC node carrying higher amount of traffic gets more accesses than others. Therefore, downstream nodes obtain higher access to the medium than the
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