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Table 2 Comparison of the main characteristics of routing metrics used in low-power wireless networks.

From: Impact of LQI-Based Routing Metrics on the Performance of a One-to-One Routing Protocol for IEEE 802.15.4 Multihop Networks

Routing metric Properties of the metric
  Hop count Awareness of link quality Quality of all links is distinguished Link quality estimation method Nature of the routing protocol
Hop count Yes No No
Shortest path with link quality threshold [5] Yes, (considers only good quality links) Yes No Packet-based techniques Proactive, one-to-one
Link quality routing [35] Yes (implicitly) Yes Yes (quantification) Packet-based techniques Proactive, one-to-one
ETX [17]/MT [5] Yes (implicitly) Yes Yes Packet-based techniques Proactive, one-to-one and many-to-one
MultiHopLQI [6] Yes (implicitly) Yes Yes LQI Proactive, many-to-one
ZigBee (link quality) [4] Yes (implicitly) Yes Yes (quantification) Packet-based techniques/average LQI Reactive, one-to-one
Hop count while avoiding weak links [38] Only when considered paths have the same number of weak links Yes No LQI Reactive, one-to-one
MAX-LQI [21]/RQI [40] No Yes No LQI Reactive, one-to-many
PATH-DR [21] Yes (implicitly) Yes Yes LQI Reactive, one-to-many
LETX Yes (implicitly) Yes Yes LQI Reactive, one-to-one