Enabling IEEE 802.15.4 cluster-tree topologies in OMNeT++

¾ IEEE 802.15.4/Zigbee standards → protocol stack for communications of low cost, low rate, and energy efficient wireless embedded devices ¾ 802.15.4 enables star topologies (a coordinator and a set of leaf nodes) ¾ Coordinator emits a periodical 'beacon' to keep leaf nodes synchronized. After every beacon, nodes can transmit for a certain time (superframe duration) with CSMA/CA. The rest of the time nodes can be in a low consumption state. ¾ Star topologies can be interconnected to form mesh or cluster‐tree networks: a coordinator (or router) can be coordinated ¾ Problem: Beacon emissions and superframe durations of the coordinators must be properly planned and scheduled. ¾ Goal: Modify existing 802.15.4 model in OMNeT++ to implement several algorithms that organize the activity periods of the coordinators in an IEEE 802.15.4 Cluster‐Tree network.