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Communication system, first node, gateway, network server and time synchronization method

A network server and communication system technology, applied in the field of time synchronization, can solve the problems that the LoRa gateway cannot receive multiple GPS satellite positioning signals at the same time, the installation is difficult, and the time synchronization mechanism is not suitable for the LoRa gateway.

Active Publication Date: 2020-09-08
ALIBABA GRP HLDG LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in indoor situations, for example, due to weak or almost no GPS signals, the LoRa gateway cannot receive positioning signals from multiple GPS satellites at the same time, making the GPS-based time synchronization mechanism not suitable for LoRa gateways set indoors
However, if an outdoor GPS antenna is used to receive GPS signals, a longer GPS antenna needs to be installed, which is difficult and expensive to install

Method used

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  • Communication system, first node, gateway, network server and time synchronization method
  • Communication system, first node, gateway, network server and time synchronization method
  • Communication system, first node, gateway, network server and time synchronization method

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Embodiment Construction

[0057] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0058] LoRa is a low-power local area network wireless standard. Due to its long-distance, low power consumption, multi-node, and low-cost characteristics, it has been used in all walks of life as the most promising low-power wide-area communication technology. industry. Among them, LoRaWAN is an open standard that defines the communication protocol of LPWAN technology based on LoRa chips.

[0059] The LoRa gateway is the communication bas...

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Abstract

The invention discloses a communication system, a first node, a gateway, a network server and a time synchronization method. The communication system comprises the first node and the gateway, whereinthe time of the first node, namely the reference time, is synchronous with standard time; the first node transmits a first request message, records the first reference time when the first request message is transmitted, and transmits a second request message; the second request message carries the first reference time; the gateway forwards the first request message and the second request message to a network server and calibrates the time of the gateway on the basis of a time calibration command from the network server; and first gateway time when the gateway finishes receiving the first request message is added to the first request message. Therefore, the time synchronization of the gateway and the reference time is realized at lower cost.

Description

technical field [0001] The present disclosure relates to the technical field of communication, and in particular to a communication system, a first node, a gateway, a network server and a time synchronization method respectively executed therein. Background technique [0002] With the development of the Internet of Things technology, a variety of wireless technologies have emerged, among which LoRa (Long Range) technology is currently the most promising low-power wide-area technology due to its long-distance, low power consumption, multi-node, and low-cost characteristics. Communication technology has been used in various industries. [0003] In the LoRa network, each gateway periodically transmits beacon signals in order to provide communication services with a certain quality of service for terminal devices that support it. When the LoRa gateway is running, due to the drift of the gateway clock crystal oscillator, clock calibration needs to be performed regularly (the acc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/80H04W56/00
CPCH04W56/0015H04W4/80
Inventor 董帅甫
Owner ALIBABA GRP HLDG LTD