Data transmission method and apparatus

Abstract

A data transmission method and device applicable to a hopping-retransmission mechanism established inside a CPF of a superframe, so as to switch channels, shorten a switching period, and improve the reliability of data interaction. The method in the embodiment of the present invention comprises: selecting two channels as a rendezvous channel and a backup channel, and dividing a CFP of a superframe into three SCFPs, a second SCFP being used for retransmitting data that a node fails to send in a first SCFP, a third SCFP being used for retransmitting data that the node fails to send in the second SCFP, and the time slot sequence in the first SCFP of each node being the same as the time slot sequence in the second SCFP; broadcasting a beacon frame on the rendezvous channel inside a beacon period of the superframe, the beacon frame containing channel selection information and time slot division information; receiving data sent by the node; and sending an acknowledgement frame.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data transmission method and device. Background technique [0002] ZigBee, wireless compatibility certification (WiFi, Wireless Fidelity), and Bluetooth have the problem of co-channel interference, and when working in the 2.4GHz frequency band, the penetration and sensitivity of transmitted data are poor, and the data transmission distance is not satisfactory. The spread spectrum technology used by WiFi has a great impact on ZigBee. Usually, ZigBee basically cannot work in places with WiFi hotspots. In the wireless meter reading system, the mainstream technology adopts the proprietary protocol wireless ad hoc network technology in the low-frequency ISM (Industrial Scientific Medical) frequency band, and its frequency bands include 915MHz, 868MHz, 433MHz and the newly released 470-510MHz frequency band. Although the low-frequency band networking has the advantage...

AI Technical Summary

Problems solved by technology

[0007] However, in the above technical solutions, the channels used for communication are switched in each superframe period, and a series of procedures are counted, judged, and issued, resulting in a too long channel switching cycle, which cannot meet the time-varying requirements of channel quality, and there is a serious lag in channel switching , the node in the cluster or the cluster head node uploads the statistical channel information to the cluster head node or the aggregation node, which takes up a lot of bandwidth resources, and each node in the network needs to periodically count the status information of the channel used, which takes up a lot of cache capacity of the node device. Reduce device processing speed and increase device power consumption

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