The circuit and implementation method for on-site programming of SIM card data in LTE equipment

Abstract

A circuit implementation method for on-site programming of SIM card data in LTE equipment. After the plug of the card writer is connected to the card writing interface XS1, the 5V output power of the card writer supplies power to relay K1, relay K2 and power chip N2, and the relay K1 and relay K2 are energized and closed, so that the power pin VDD, reset pin RST, data pin IO, and clock pin CLK of the SIM chip N1 are disconnected from the main board and connected to the card writing interface XS1, that is, through the card writing interface The software writes the IMSI and IMEI information of the SIM chip to complete the card writing operation. LTE devices of the same model do not need to distinguish ID codes during production, storage, transportation, and installation, and only write the SIM card data of each device before official use or the opening of the entire system, which saves equipment production and management costs, and reduces storage, transportation, and installation costs. The sorting workload in the process has created convenient conditions for subsequent equipment use and maintenance.

Description

technical field [0001] The invention relates to a dedicated LTE equipment circuit for subways, in particular to a circuit and an implementation method for on-site programming of SIM card data for subway wireless communication LTE equipment. Background technique [0002] Modern subway wireless communication widely adopts private network communication based on LTE network, which can realize multi-mode wireless Internet access, and realize digital communication between mobile devices and the ground. [0003] LTE devices must have a SIM card that indicates their "identity" when they are connected to the network. At this stage, every LTE device shipped out of the factory is generally loaded with a SIM chip with written data. [0004] International Mobile Subscriber Identity in the SIM card IMSI (International Mobile SubscriberIdentity) are different. In this way, a large number of identical LTE devices must be distinguished during the production, transportation, and installation...

AI Technical Summary

Problems solved by technology

[0004] International Mobile Subscriber Identity in the SIM card IMSI (International Mobile SubscriberIdentity) are different. In this way, a large number of identical LTE devices must be distinguished during the production, transportation, and installation processes because they are equipped with different SIM chips. That is, the devices must be clearly identified and managed It brings a lot of workload, and it is prone to errors due to human factors. Not only that, but when the equipment is transported to the site, it is necessary to select the corresponding equipment for installation according to the identification

[0005] The installation of LTE equipment is done by the equipment contractor or engineering unit of the vehicle factory. It is easy to form management loopholes, so that the equipment with the SIM card cannot be installed correctly, and the error is not easy to be found. If these problems are found in the subsequent debugging process, go to the Check the SIM card number. Replacing the device will bring a lot of work, which may cause the device to be returned to the factory to reinstall a new SIM card, resulting in delays in the construction period and increased project costs.

[0006] It will also cause problems in the later use and maintenance of the product. When replacing the device, it is necessary to open the original device, take out the internal SIM chip, then open the device to be replaced, and then install the removed SIM chip, which wastes man-hours and increases maintenance cost

[0007] These are all caused by the fact that the pre-written SIM card cannot be rewritten after it is loaded into the device, which brings a lot of inconvenience to production, transportation, installation, use, maintenance, etc.

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