Data dissemination method in wireless sensor network

Abstract

The invention provides a data dissemination method in a wireless sensor network, and is particularly suitable for scenes for performing program wireless updating on a sensor network node. The method comprises the following steps of: dividing high-capacity dissemination data into data blocks of fixed sizes, and dividing the data blocks into a preset number of data packets with fixed lengths, wherein each data packet corresponds to a unique sequence number; and receiving the data packets received by a node according to a bit vector mark, and requesting to retransmit the lost packets, wherein nodes at different distances away from a data source in a network can synchronously transmit the data blocks with different numbers to form pipeline transmission and regularly send and receive the data by a time division multiple access (TDMA) method according to a time slot; when a conflict is detected, a time slot table is dynamically adjusted and exchanged, so that subsequent conflicts can be reduced, and redundant data receiving is also reduced; and a plurality of sending nodes can send the data packets according to different starting sequence numbers, so that the data dissemination time can be shortened, and energy consumption in a data dissemination process can be reduced.

Description

technical field [0001] The invention relates to a wireless sensor network technology, in particular to a data distribution method in a wireless sensor network. Background technique [0002] Wireless sensor network is a wireless network system composed of a large number of micro sensor nodes deployed in the monitoring area, and multiple wireless networks are formed between nodes through self-organization technology. An important requirement for sensor network applications is how to adjust or change the running programs on network nodes after network deployment, which is called over-the-air update or over-the-air programming. To achieve over-the-air updates, the large amount of data contained in the new program needs to be distributed to all network nodes. [0003] The program code distribution (code dissemination) is the process of sending the update code from the base station node (BS) to all nodes in the target update area of ​​the network through multiple wireless routes....

AI Technical Summary

Problems solved by technology

However, this protocol cannot avoid a large number of transmission conflicts caused by hidden terminal problems. In the case of pipeline transmission, nodes will repeatedly receive received data and increase unnecessary energy consumption.

It is also proposed to use the TDMA distribution protocol to reduce conflicts. However, the TDMA distribution protocol establishes a fixed network time slot allocation scheme. When the network node switches its role as the update data sender and receiver, the fixed time slot scheme It will cause some nodes to wait for a lot of time slots and cannot send data immediately, thus increasing the time of the entire distribution process

However, the time slot adjustment method of some TDMA schemes is more complicated, and its cost is not suitable for frequent changes of node roles in the case of pipeline transmission.

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