A sensor data gathering under a multi-hop guaranteed time slots architecture

This paper proposes a sensor data gathering scheme under a multi-hop GTS architecture in wireless sensor networks. This architecture is used when there is a need to gather data from sensor node where there is no sink node connected to an existing network, or it is required to get a series of data specific to an event or time. The transmit distance of the beam signal is longer than that of the usual sensor node. The nodes of the network make a tree network when receiving a beam message transmitting from the powerful root node. All sensor nodes in a sink tree network synchronize to the super frame and know exactly the sequence value of each super frame. When there is data to send to the sink node, the sensor node sends data at the corresponding allocated channel. Data sending schemes under the guaranteed time slot are tested and the delay and jitter performance is enhanced comparing with the normal wireless data exchange scheme.