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This paper introduces a novel quality estimator that uses different metrics to decide the best path towards the root in Wireless Sensor Networks. The different metrics are assessed at medium access control layer (MAC), under the IEEE 802.15.4 standard, and are used at network layer, enhancing the best path selection process done by the routing prot...
Contexts in source publication
Context 1
... end-to end delay can be assumed to correspond with one frame duration per hop up to the root. It is true that this assumption fails to consider retransmissions of failed packets, but in the overall quality estimation, this is palliated by the impact of ETX. The function of mapping of the number of hops used in the quality function is shown in Fig. ...
Context 2
... it is a simple assumption, it can be justified since the MAC layer follows a synchronized and deterministic behavior governed by TSCH, with a data packet generation rate (6 seconds/packet) much higher than the duration of slot frames scheduled at MAC layer. Each generated packet needs one slot per hop to be transmitted. Since we use frames composed of 7 slots of 10 milliseconds, 85 slot frames fit within one period, leaving a sufficient margin to forward any packets remaining in the node's queue. Therefore, a packet end-to end delay can be assumed to correspond with one frame duration per hop up to the root. It is true that this assumption fails to consider retransmissions of failed packets, but in the overall quality estimation, this is palliated by the impact of ETX. The function of mapping of the number of hops used in the quality function is shown in Fig. ...
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