Wireless sensor component and TDMA self-organized network implementation method

Abstract

The invention provides a wireless sensor component and a TDMA self-organized network implementation method based on the wireless sensor component, wherein each node of a network is provided with one wireless sensor component. The TDMA self-organized network implementation method comprises the following steps: step one, time slots of a TDMA self-organized network are determined, one time slot is set for each wireless sensor component, and each time slot comprises three beats; step two, a TDMA networking initiating node is determined; step three, time slot synchronization is conducted on the TDMA self-organized network. According to the wireless sensor component and the TDMA self-organized network implementation method based on the wireless sensor component, a mutual synchronization method is adopted, time slot synchronization starts from an initiating node of frame synchronization, frame initiating moments of all the nodes are aligned with the initiating node till the frame initiating moments of all reachable nodes in the network are aligned with an initiator, and therefore the aligning process is completed. Time slot synchronization of the organized network progresses at a high speed which can reach five microseconds; besides, the mutual synchronization method is adopted, so that clocks of all the nodes are controlled mutually, it is avoided that a certain node is depended on, invulnerability is high, and the wireless sensor component can adapt for dynamically-changing network topology.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to the realization of TDMA networking, in particular to a wireless sensor component and a method for realizing a TDMA ad hoc network based on the wireless sensor component. Background technique [0002] In wireless ad hoc sensor networks, except for a few nodes that need to move, most of the nodes are static, and they usually operate in harsh or even dangerous remote environments that are inaccessible to humans. The characteristics of the TDMA mechanism are very suitable for the needs of the sensor network: the TDMA mechanism does not have the collision retransmission problem of the competition mechanism; the data transmission does not require too much control information; the node can enter the sleep state in time in the idle time slot. The TDMA mechanism requires strict time synchronization between nodes, and time synchronization is a basic requirement of wireless sensor net...

AI Technical Summary

Problems solved by technology

[0018] The master-slave synchronization method uses the "temporary group leader" as the master control node to realize the synchronization of the network. Although the synchronization is simple, there are two problems: one is that the selection of the "temporary group leader" is very difficult during the operation of the network. After networking, the main control node may leave the network due to movement or damage. In order to ensure the normal operation of the TDMA network and the robustness of time synchronization, it is necessary to dynamically select the main control node and the main control backup node, and allow the main control node to Nodes are dynamically transferred and switched; the other is that node failure or interference will affect the correct transmission of synchronization information, and the resulting disturbance will accumulate along the transmission path segment by segment. When this level synchronization method is used in a mesh network, sometimes it will cause loops. road

The advantage of master-slave synchronization is that it does not increase hardware costs, but the reliability is not high. When a node fails, its controlled nodes will lose their clocks

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