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Wake-up receivers can be used in wireless sensor networks to solve the problem of node synchronization in an energy efficient manner. Conceptually, the idea is to use a dedicated wake-up signal before the actual transmission over a main radio transceiver. Several ideas have been discussed in the literature on how to make such an architecture as energy efficient as possible. State of the art are multi-stage...
Duty cycling has been the main concept for saving energy in sensor networks for a long time. Yet, additional overhead for synchronization and the fact that overhearing and idle listening cannot completely be prevented, motivated further research. Wake-up receiver, i.e., additional ultra-low power radios that are not switched off and can receive a so called wake-up signal, aim to fill this gap. The...
We study the feasibility of IEEE 802.11p unicast communication in Vehicular Ad Hoc Networks (VANETs). In brief, we found unicast communication using MAC acknowledgement frames (ACKs) to be unsuitable for vehicular networks, because missing ACKs make protocol operations susceptible to pronounced head of line blocking effects. Worse, a transmit queue that is blocked by a missing ACK will delay messages...
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