Data transmission method and apparatus

Abstract

The embodiment of the invention discloses a data transmission method and a data transmission apparatus, and is used for switching channels, shortening switching periods and improving data interaction reliability by virtue of a frequency hopping-retransmission mechanism established in a superframe CPF (Content Free Period). The method of the embodiment of the invention comprises the following steps of: selecting two channels as a convention channel and a spare channel, and dividing the superframe CPF into three SCFPs (Superframe Content Free Period), wherein a second SCFP is used for retransmitting data which fails to be transmitted by a node in a first SCFP, a third SCFP is used for retransmitting the data which fails to be transmitted by the node in the second SCFP, and a time slot sequence of each node in the first SCFP is same as the time slot sequence in the second SCFP; broadcasting a beacon frame on the convention channel in a beacon period of the superframe, wherein the beacon frame contains channel selection information and time slot division information; and receiving the data sent by the node, and sending a confirmation frame.

Description

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

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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