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A-gnss assistance data request method in internet of things

An auxiliary data request and auxiliary data technology, applied in the direction of location information-based services, power management, transmission systems, etc., can solve the problems of limited terminal traffic and connection times, increase the complexity of terminal software, and lack of flexibility. Reduce the number of network connections and data traffic, reduce the size, reduce the effect of transmission interaction

Active Publication Date: 2020-06-09
NURLINK TECH NANJING LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. The terminal requires very low power consumption
[0007] 3. Terminal traffic and connection times are very limited
[0008] 4. A specific terminal supports only very limited applications and functions
If the IoT terminal needs to support the above-mentioned LPP / SUPL or HTTP over TCP / IP, the software complexity, storage and power consumption of the terminal will be greatly increased
In addition, the request message packets of these protocols are large, and it does not have some flexibility. These protocols are not suitable for IoT terminals that have extremely high requirements for software simplicity, traffic, power consumption, and number of connections.

Method used

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  • A-gnss assistance data request method in internet of things
  • A-gnss assistance data request method in internet of things
  • A-gnss assistance data request method in internet of things

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The present invention determines the download of GNSS auxiliary data through the results of GNSS capture and star search, so as to greatly reduce the downloading connection request of GNSS auxiliary data and the amount of downloaded data in practical applications. The invention provides an A-GNSS auxiliary data request method in the Internet of Things, and only when the GNSS capture and search is completed and a sufficient number of satellite signals are captured, only the auxiliary data of the satellites that are captured and have no valid ephemeris are requested to be downloaded. Specifically, the following conditions are included:

[0054] 1. At the start and process of GNSS acquisition and satellite search, even if the existing GNSS ephemeris has expired or does not exist, the terminal will not request the network to download GNSS assistance data.

[0055] 2. After the GNSS capture and search is over (the process of searching for satellites generally takes hundreds ...

Embodiment 2

[0067] Based on the first embodiment, this example further adjusts the GNSS assistance data to be downloaded, so as to further reduce power consumption and traffic.

[0068] This example mainly reduces the amount of data to be transmitted by removing satellite data, thereby achieving the purpose of reducing power consumption. These two methods can be selected or used together according to needs. The following describes the two methods one by one.

[0069] For example, if Figure 6 As shown, the A-GNSS original assistance data has 3200 bytes, and the maximum amount of data transmitted each time by a certain network protocol is 1024 bytes, which requires 4 transmissions (4 interactions between the terminal and the A-GNSS server, The power amplifier of the terminal needs to be turned on 4 times), Figure 6 The left side needs to request (4) and then send 78 bytes. The invention proposes that the A-GNSS server can process the original auxiliary data, such as removing the data ...

Embodiment 3

[0083] On the basis of Embodiment 1 or Embodiment 2, the present invention can also simplify and compress the auxiliary information to reduce the amount of auxiliary data:

[0084] When the terminal sends the request message, it simplifies and compresses the requested auxiliary information indication. Perform this step when requesting satellite information after the satellite search is completed.

[0085] Each auxiliary information is generally represented by one bit, "0" indicates that the server does not need to send this information, and "1" indicates that the server needs to send this information. Such as Figure 8 Shown, which lists the information bits expressed in bits.

[0086] For the clock parameters in the ephemeris, GPS, Beidou, Galileo and Glonass each use two bits, a total of 8 bits. "00" means that the clock parameters in the ephemeris of any satellite in the constellation are not required, "10" means that the clock parameters in the ephemeris of all satellit...

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Abstract

The present invention provides a method for requesting A-GNSS assistance data in the Internet of Things, including: when the GNSS capture and search ends and a sufficient number of satellite signals are captured, requesting to download the GNSS assistance data of satellites that are captured and have no valid ephemeris. The method provided by the invention can avoid requesting unnecessary GNSS auxiliary data, thereby reducing the number of network connections and data flow, and reducing power consumption. The Internet of Things terminal requests GNSS assistance data according to the GNSS satellites captured and searched, reducing the size of the data downloaded from the server. The present invention can also adjust A-GNSS auxiliary data to adapt to the network protocol of the Internet of Things, reduce transmission interaction by 20% to 50%, and further reduce terminal power consumption and traffic. In addition, the format definition of the auxiliary data request message packet has strong applicability, and unnecessary digits can be omitted, and the bit-level request setting can effectively reduce the amount of data.

Description

technical field [0001] The invention belongs to the technical field of Internet of Things positioning, and relates to an A-GNSS auxiliary data request method in the Internet of Things. Background technique [0002] A large number of IoT terminals have positioning requirements, and the specific application scenarios and terminals include asset tracking, shared bicycles, electric vehicles, wearable devices, and so on. The mMTC (Massive Internet of Things) that will be commercialized in a large number includes NB-IoT (Narrowband Internet of Things), eMTC (Enhanced Machine Type Communication) and other low-power wide area network technologies. How terminals in these new networks realize the positioning function is a new topic in this field. [0003] The cellular Internet of Things (such as NB-IoT) will support a large number of terminals with limited network capacity. Due to these characteristics, cellular IoT requires terminals to have as little data traffic as possible. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04W4/02H04W52/02
CPCH04B7/1851H04B7/18532H04B7/18539H04B7/18547H04W4/02H04W52/0274Y02D30/70
Inventor 鲁郁
Owner NURLINK TECH NANJING LTD