Poster: Performance Study of Clustering of Zigbee Devices in OPNET Ke Dong — Diptanil DebBarma — R. Venkatesha Prasad Cheng Guo ABSTRACT ZigBee, known as IEEE 802.15.4 standard, is designed for Wireless Sensor Network (WSN) due to low power consumption and high reliability. The network layer can support star, tree and mesh topologies. In this work, cluster tree and mesh topologies are simulated in OPNET. Then throughput, delay and packet delivery ratio in direct transmission between source and sink are collected. Further, broadcast packets are simulated to show the in ‚uence of the packet interarrival time. time. While the mesh network shows the opposite behavior. In practical applications, packets in the same cluster may be duplicated so that the routers can discard the redundant packets and aggregate a larger packet. In Figure 1, cluster network with compressed packets has the best performance. 0.9 Non ’cluster with power control(1pck/s) Non ’cluster Network(1pck/s) Cluster Network(1pck/s) Cluster with compressed packets(1pck/s) Non ’cluster with power control(0.5pck/s) Non ’cluster Network(0.5pck/s) Cluster Network(0.5pck/s) Cluster with compressed packets(0.5pck/s) Non ’cluster with power control(0.2pck/s) Non ’cluster Network(0.2pck/s) Cluster Network(0.2pck/s) Cluster with compressed packets(0.2pck/s) 0.8 0.7 1. INTRODUCTION Packet delivery ratio 0.6 IEEE 802.15.4 standard uses carrier sense multiple access with a collision avoidance medium access mechanism. The throughput is heavily in ‚uenced by the tra ƒc load. The overhead is the critical issue for performance analysis. Interference and collision could obviously decrease the throughput of the global network. In [2], it shows the highest throughput is achieved, when there is only 1 source, at about 38kbps. The highest throughput with multiple sources is about 32kbps. In [1], the di €erence between delays of the mesh and the tree topology is shown to be small when the number of nodes increases. 0.5 0.4 0.3 0.2 0.1 50 100 150 200 Number of source nodes Figure 1: Packet delivery ratio in the four scenarios The broadcasting result illustrates that as the packet generation rate increases, the packet delivery ratio slightly decreases from 100% and then maintains at around 85%. 2. SIMULATION MODELS In the star topology, the end nodes only have one hop to the PAN coordinator. In the mesh topology, end nodes are Full Function Devices which can communicate with each other. The mesh topology uses AODV routing protocol which is suitable for large scale networks. When the number of nodes increases above a certain level as 200, more collisions will take place. Cluster tree and mesh topologies in the following are deployed in a 4km*3km square area with 200 end nodes in OPNET. 4. CONCLUSIONS In the simulation results, cluster topology performs better than the non-cluster topology with 200 end devices. The cluster topology is suitable for sensor networks to meet the requirements of energy and timeline saving. However, the cluster topology still has disadvantages due to the collisions at the cluster head. To solve this problem, the compression mechanism could be used to improve the performance of the cluster topology with fewer collisions and transmissions at the cluster head. 3. SIMULATION RESULTS In the simulation results, it shows that Mesh topology generates higher throughput when the number of nodes is smaller than 50. Although the throughput in non-cluster topology is higher, the received packet in the sink is much less. With more than 100, the throughput in mesh network shows a dramatic drop due to the large collisions with more hops between sources and sinks. If the packet is compressed into a lager packet at routers, higher packet delivery ratio can be achieved especially with random packet inter arrival Authors are with TU Delft, Telecommunication Department. Email: k.dong@student.tudelft.nl, {d.debbarma,r.r.venkateshaprasad,c.guo}@tudelft.nl — 5.

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