I'm not sure if a sensible timeslot based system could get down as low as the battery usage that something like zigbee battery powered sensors can get. Those a

I'm not sure if a sensible timeslot based system could get down as low as the battery usage that something like zigbee battery powered sensors can get. Those are transmitters running on battery, usually with the radio fully powered down, only powering them up to transmit if they need to report a changed value, or to report in at least once a day, so the hub knows they haven't died. Something like a magnetic Reed switch door/winodw sensor would wake up the mcu via a level sensitive interrupt, so obviously the "sensor" portion for some sensor types can have negligible power draw. How could any battery powered receiver possibly get power usage that low? Like even timeslots of only once a minute would seem likely to use considerably more power, and is likely too much latency for many purposes. But surely more frequent timeslots would only increase power drain?