If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
According to the IEEE 802.15.4 protocol, the unslotted CSMA/CA algorithm is similar to the slotted CSMA/CA algorithm, besides that it is used in the non-Beacon-enabled mode. In the unslotted CSMA/CA, each time a device wishes to transmit data frames or MAC commands, it waits for a random period. If the channel is found to be idle (done by CCA mechanism), following the random back-off, the device transmits its data. If the channel is found to be busy following the random back-off, the device waits for another random period before trying to access the channel again. Acknowledgment frames are sent without using a CSMA-CA mechanism.
