Packet delay in WI-FI networks of unmanned aerial vehicles

Authors
  1. Li, J.
  2. Zhou, Y.
  3. Lamont, L.
  4. Rabbath, C.A.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
An important but challenging problem in multiple unmanned aerial vehicle (UAV) cooperative control system is how the UAV's should be networked over the wireless medium so that information can be transmitted in near real-time. In this memorandum, we conduct a statistical analysis of the packet end-to-end delay in a Wi-Fi network of UAV's. In the network, each UAV runs the distributed coordination function (DCF) OF ieee 802.11 at the medium access control (MAC) layer. All UAV's are one-hop meighvors, and a pair of UAV's can communicate over the wireless channel using a fixed data rate. A light traffic condition is used (i.e., in each UAV, data packets are generated one at a time and the interval between two successive generation times is described by independent random variables following an expotential distribution with some fixed mean). By modeling each UAV to be an M/M/1 queuering system, we first derive the mean packet end-to-end delay under high traffic conditions. Numerical and simulation results show that the mean packet end-to-end delay derived in this memorandum is accurate for Wi-Fi networks under the light traffic condition. It increases with either the number of UAV's in the network or the packet generation rate. In addition, existing results in the literature, based on the saturated traffic condition (i.e., packets are always supplied for transmission), tend to overestimate by a large amount the mean packet ent-to-end delay for networks with light traffic. In the s

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Report Number
DRDC-OTTAWA-TM-2010-201 — Technical Memorandum
Date of publication
01 Nov 2010
Number of Pages
34
DSTKIM No
CA034599
CANDIS No
534108
Format(s):
Electronic Document(PDF)

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