Sensor network and method of link extension based on time slot relaying in the same

摘要

A sensor network includes: a network coordinator that broadcasts a first beacon frame; a sensor device that receives a frame from the network coordinator or transmits a frame to the network coordinator; and at least one repeater that relays the frame of the network coordinator to the sensor device or relays the frame of the sensor device to the network coordinator and that broadcasts a second beacon frame that is synchronized with the first beacon frame, wherein the sensor device is synchronized with the second beacon frame to transmit/receive the frame, the cyclic-superframe includes a plurality of slotted-superframes corresponding to the first beacon frame and the second beacon frame, and the network coordinator, the sensor device, and the repeater operate in a periodically repeated cyclic-superframe structure.

主权项

1. A sensor network, comprising:
a network coordinator that broadcasts a first beacon frame; a sensor device that receives a frame from the network coordinator or transmits a frame to the network coordinator; and at least one repeater that relays the frame from the network coordinator to the sensor device or relays the frame of the sensor device to the network coordinator and that broadcasts a second beacon frame that is synchronized with the first beacon frame, the at least one repeater being configured to search for beacon frames of peripheral repeaters thereof and provide information about the searched beacon frames to the network coordinator when the at least one repeater requests an access registration to the network coordinator to receive from the network coordinator a designation of a time slot to relay a beacon frame, wherein the sensor device is synchronized with the second beacon frame to transmit/receive the frame, the network coordinator, the sensor device, and the repeater operate in a periodically repeated cyclic-superframe structure, the cyclic-superframe comprises a plurality of slotted-superframes corresponding to the first beacon frame and the second beacon frame, a first repeater of the at least one repeater relays a first frame at a time slot that is delayed by a first gap between a first superframe including a beacond slot for the first beacon frame and a second superframe including a beacon slot for the second beacon frame of the first repeater from a first time slot when the first repeater receives the first frame at the first time slot of bidirectional device slots included in the cyclic-superframe from the network coordinator, and the first gap can be changed according to the information about the searched beacon frames.