unit sends a wake-up. Furthermore the downlink is used to
organize the channel access of each sensor. So, collisions
are avoided and the package rate is significantly increased
compared to class 1 sensors.
C. Cell sensors with active downlink receiver (class 3)
The class 3 sensors will contain an UHF downlink. A
centralized measurement and transmission control strategy will
be implemented. The battery electronic control unit sends addressed
commands and multicast/broadcast commands to the
sensors. Class 3 sensors will have a symmetric bidirectional
communication hardware. These sensors work under similar
conditions as IEEE 802.15.4. This implies protocol restrictions