Risk-Aware Distributed Beacon Scheduling for Tree-Based ZigBee Wireless Networks
In a tree-based ZigBee network, ZigBee Routers (ZRs) must schedule their beacon transmission time to avoid beacon collisions. The beacon schedule determines packet delivery latency from the end devices to the ZigBee coordinator at the root of the tree. Traditionally, beacon schedules are chosen such that a ZR does not reuse the beacon slots already claimed by its neighbors, or the neighbors of its neighbors. The authors observe, however, that beacon slots can be reused judiciously, especially when the risk of beacon collision caused by such reuse is low. The advantage of such reuse is that packet delivery latency can be reduced. They formalize their observation by proposing a node-pair classification scheme.