Internet of Things by Simone Cirani Gianluigi Ferrari Marco Picone Luca Veltri

Author:Simone Cirani,Gianluigi Ferrari,Marco Picone,Luca Veltri
Language: eng
Format: epub
ISBN: 9781119359708
Publisher: John Wiley & Sons, Inc.
Published: 2018-08-28T16:12:22+00:00

4.4.2 Efficient Multiple Unicast Forwarding

While the described algorithm implements an optimized flooding mechanism by avoiding loops through the introduction of Bloom filters, broadcasting with the ContikiMAC radio duty‐cycling protocol results in inefficient transmissions, leading to higher energy consumption and end‐to‐end delays. In fact, in ContikiMAC, a broadcasting node must repeatedly transmit a packet for the full wake‐up interval [49], in order to ensure that it can be received by all neighbor nodes, regardless of their wake‐up time. This conservative approach has the following drawbacks:

the number of transmitted packets is larger than necessary, and therefore energy consumption is higher;

when a node is broadcasting a packet, other nodes are not allowed to transmit, and this delays the transmission until the channel is clear;

since ContikiMAC broadcasting does not make provision to acknowledge received packets, it might be that not all neighbors have successfully received the packet, thus leading to unreliable transmission.

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