consistency single active slot in slotframe,

[Xavier Vilajosana]

2. The text says that there is only a single active slot in slotframe, but the figure indicates that the number of slots is variable. Why aren't these consistent?

TW> Both concepts are not contradictory. In a slot frame with N slots: TW> - 1 slot is scheduled, i.e. used for sending/receiving frames TW> - N-1 slots are not scheduled, i.e. the radio of the nodes stays off TW> You comment shows this isn't clear. TW> @Editor, can you propose a rewording?

[Xavier Vilajosana]

for me the text is really clear

The slotframe is composed of a configurable number of time slots. Choosing the number of time slots per slotframe needs to take into account network requirements such as density, bandwidth per node, etc. In the minimal configuration, there is only a single active slot in slotframe, used to transmit/receive both EBs and data link-layer frames. The trade-off between bandwidth, latency and energy consumption can be controlled by choosing a different slotframe length. The active slot MAY be scheduled at the slotOffset 0x00 and channelOffset 0x00 and MUST be announced in the EBs. EBs are sent using this active slot to the link-layer broadcast address (and are therefore not acknowledged). Data packets, as described in <xref target="sec_cell_options"/>, use the same active slot. Per IEEE 802.15.4 specification, data packets sent unicast on this cell are acknowledged by the receiver <xref target="IEEE802154"/>. The remaining cells in the slotframe are unscheduled, and MAY be used by other (dynamic) scheduling solutions. Details about such dynamic scheduling solution are out of scope of this document. Details about the usage of the non scheduled cells are out of scope of this document.