Network controller, node device and mesh network system thereof

A node device of a mesh network, the node device comprising:

• a) a radio controllable to transmit and receive data;
• and
• b) a control device being configured to synchronize according to a beacon of a network controller broadcasted in a beacon slot, and to send a data packet in the corresponding time slot according to a slot allocation state, wherein each of said time slots corresponds to only one node device of a plurality of node devices in said mesh network.

A network controller of a mesh network, the network controller comprising:

• a) a radio controllable to transmit and receive data;
• and
• b) a control device configured to generate a beacon comprising a slot allocation state of said mesh network, and to control said radio to send said beacon in a predetermined beacon slot, wherein said slot allocation state represents an allocation state of a fixed time slot.