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Data transmission method and apparatus

A data transmission method and data technology, applied in the field of communication, can solve problems such as multi-buffer capacity of node devices, reduce device processing speed, and occupy large bandwidth resources, so as to improve the reliability of data interaction, cope with unpredictable interference, and improve data quality. The effect of transmission efficiency

Active Publication Date: 2014-12-03
HUAWEI TECH CO LTD
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  • Description
  • Claims
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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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Embodiment Construction

[0027] The embodiment of the present invention provides a data transmission method and device, which are used to establish a frequency hopping-retransmission mechanism in a CPF of a superframe, and accordingly switch channels for data transmission, shorten the switching period, and improve the processing speed of the device. Respond to unpredictable interference in a timely manner and improve the reliability of data interaction.

[0028] Typical application scenarios of the technical solutions provided in the embodiments of the present invention are as follows: figure 1 As shown, a star topology structure is formed between the home gateway and the meter nodes in the meter reading system, and a personal area network is formed with the family as the unit. Each home has a home gateway, and the water meter, gas meter, and other traditional The sensor nodes and the data of the electric meter nodes at the power well are copied together and uploaded to the central computer of the com...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16
CPCH04L1/1893H04L1/1887H04W74/006H04J3/16H04L1/08H04L5/0055
Inventor 刘培
Owner HUAWEI TECH CO LTD
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