Table 2: Main features of AH-MAC, LEACH, and IEEE 802.15.4.

AH-MACLEACHIEEE 802.15.4

Beacon modeYesNoYes
TDMA scheduleNoYesYes
Association requiredCHs onlyAll nodesAll nodes
Active time1 slotN slotN slot
Intercluster routing supportYesNoYes
Network sizeUnlimitedLimitedUnlimited
ACK supportYesNoYes