Centerless TDMA (Time Division Multiple Access) synchronization method suitable for Ad hoc Network

Abstract

The invention discloses a centerless TDMA synchronization method suitable for wireless Ad hoc Network, belonging to the technical field of TDMA communication of the wireless Ad hoc Network. The method comprises the steps that a synchronization header is arranged on a distributed signal-sending time slot; a time frame counter is arranged on each node, and a time slot counter is arranged on each time frame of the different nodes; and after any node is started, information is intercepted, and the time frame counter is used for counting, wherein if the synchronization header of another node is received within one time frame, time of the node is synchronized with that of the corresponding node; if the synchronization headers of other nodes are not received, the time slot counter is used for counting; if the synchronization header is received before the next distributed signal-sending time slot, time of the node is synchronized with that of the corresponding node; and otherwise, the synchronization header of the node is sent out in the next distributed signal-sending time slot.

Description

technical field [0001] The invention belongs to the technical field of time division multiple access communication of wireless ad hoc networks, and in particular relates to a centerless time division multiple access synchronization method suitable for wireless ad hoc networks. Background technique [0002] Time Division Multiple Access (TDMA) is a channel access method commonly used in wireless ad hoc networks at present. TDMA channel access needs to maintain a common time reference to achieve conflict-free TDMA communication, and network time synchronization is a basic requirement. Therefore, network synchronization technology is one of the key technologies to realize TDMA communication. For distributed (no center) wireless ad hoc networks, there is no unified clock between nodes, and the time division multiple access channel access method requires a unified clock, so the traditional method is to set up a central node or a temporary center The way of nodes to unify the cl...

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Problems solved by technology

[0005] However, TDMA timing synchronization technology has disadvantages. Among them, the disadvantage of high-precision clock method is that each node in the network needs to be equipped with high-precision clock method, which has high cost, large volume and power consumption.

The disadvantage of the external time reference method is that the operation of the network must rely on the GPS or Beidou time scale signal. Once the time scale signal is unavailable, the network cannot operate

The central distributed synchronization method, whether it is set or generated by a certain rule, must generate a central node, and all nodes in the entire network will synchronize with this node. Once the central node exits the network or is destroyed, the entire network node There will be no time synchronization standard, and the network will soon be in an out-of-synchronization state, causing data transmission and reception collisions, resulting in inverted error packets and packet loss

However, the mutual synchronization technology realized by the mathematical iteration method has slow network convergence and low timing accuracy.

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