| 摘要 |
Sensor devices in a network select an appropriate concentrator device or access point (root nodes 20, 30, 40) to connect to based on tree size, i.e. the number of sensor devices (or leaf nodes) associated with a given concentrator or access point, so as to balance the tree sizes. Control messages are forwarded from a subset of root nodes to the sensor devices, each message comprising a tree size value associated with a corresponding root node. Sensor devices then determine selection metrics based on the tree size values and send a control message to the selected root node. The selection metric may also be based on rank value, i.e. a nodes position relative to other nodes. The invention utilises the Routing Protocol for LLNs (Low power and Lossy Networks) or RPL with root nodes communicating their tree size in DODAG (Destination Oriented Directed Acyclic Graph) Information Objects or DIO messages.
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