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Reducing Traffic Congestion in ZigBee Networks: Experimental Results

Reducing Traffic Congestion in ZigBee Networks: Experimental Results. 2013 9th International Wireless Communications and Mobile Computing Conference (IWCMC) Author: Luca Secci , Chiara Buratt

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Reducing Traffic Congestion in ZigBee Networks: Experimental Results

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  1. Reducing Traffic Congestion in ZigBee Networks:Experimental Results 2013 9th International Wireless Communications and Mobile Computing Conference (IWCMC) Author: Luca Secci, Chiara Buratt Department of Electrical, Electronic and Information Engineering(DEI), University of Bologna Bologna, Italy

  2. Outline • Introduction • AODV-based ZigBee Routing Protocol • Proposed Routing Protocol • Superframe Structure • Stream of Packets • Protocol Implementation • Numerical Results • Conclusion

  3. Introduction • We propose and test, through experimentation on the field, a novel routing protocol for ZigBee networks. • The proposed solution aims at reducing traffic congestion, causing delays, packets losses and unfair use of the energy resources of nodes in the network. • The protocol exploits, at the network layer, the information related to medium access control losses, therefore collisions, to select the best path to reach the destination, accounting for both, connectivity and congestion on links.

  4. Introduction

  5. Introduction

  6. AODV-based ZigBee Routing Protocol

  7. AODV-based ZigBee Routing Protocol • The proposed routing protocol exploits at the network layer, the information coming from the MAC layer. As stated above, according to the ZigBee standard, the link cost is a function of the success probability of the link, Pli , accounting for link level losses and not MAC losses. • We modify the AODV protocol, such that nodes at each link may compute losses not only due to link failures, but also to MAC failures.

  8. Proposed Routing Protocol • ZigBee Routing Protocol Cost • Cli = min{7, floor(Pli−4)} • Proposed Routing Protocol Cost • Pli = Pconi· Pmaci • Cli = min{7, floor((Pconi· Pmaci)−4)} • Pmaci = nof successfully received packets on link i n of generated packets on link i

  9. Superframe Structure

  10. Stream of Packets Proposed ZigBee

  11. Protocol Implementation

  12. Numerical Results Packet Loss Rate (PLR)

  13. Numerical Results

  14. Conclusion • This paper presents a novel routing protocol for multi-hop wireless mesh networks, based on ZigBee standard. The proposed protocol exploits at the network layer, the information coming from the MAC layer, related to MAC losses, to reduce congestion in the network. • It would be useful to underline that it is expected that the proposed protocol improves the performance also in terms of average delay, since the decreasing of packets losses at the different links, will reduce the average number of retransmissions per link, resulting in lower delays.

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