Communication system and method

Abstract

The invention relates to a communication system and a communication method. The communication system disclosed by the invention comprises a card reader and a radio-frequency device, wherein the card reader and the radio-frequency device control a communication distance through a low-frequency alternating magnetic field signal; the card reader and the radio-frequency device exchange information through a radio-frequency channel; the radio-frequency device comprises a magnetic signal emitter and a second radio-frequency communication unit; the magnetic signal emitter is used for generating and emitting the low-frequency alternating magnetic field signal; the second radio-frequency communication unit is used for exchanging information with the first radio-frequency communication unit; the card reader comprises a magnetic signal receiver and a first radio-frequency communication unit; the magnetic signal receiver is used for receiving the low-frequency alternating magnetic field signal, and the first radio-frequency communication unit is used for exchanging the information with the second radio-frequency communication unit. According to the invention, the data communication distance between a mobile terminal comprising the radio frequency device and the card reader is reliably controlled within a prescribed range without calibration on the mobile terminal, and unsafe factors that the card swiping distance exceeds the preset card swiping distance due to the fact that the card reader is maliciously distorted are avoided, thereby improving the transaction security.

Description

technical field [0001] The present invention relates to the communication field, in particular to a communication system and method. Background technique [0002] With the popularization of mobile terminals, there is an urgent application demand for mobile terminal payment by using mobile terminals. Currently, there are many implementation schemes, but each has its own disadvantages. At present, it has appeared that a radio frequency function (referred to as a radio frequency SIM card) is added to the SIM (Subscriber Identity Module) card in the mobile terminal or a short-distance communication module is added on the main board of the mobile terminal to realize short-distance communication of the mobile terminal. The latter is called NFC (Near Field Communication, near field communication). The emergence of these methods makes the mobile terminal a super intelligent terminal that can recharge, consume, trade and authenticate, which greatly meets the urgent needs of the marke...

AI Technical Summary

Problems solved by technology

[0007] 2. The 13.56MHz frequency used by NFC needs to be calibrated to be used for distance control

[0008] Even if there is an NFC antenna that can be replaced in any mobile terminal, since it uses a frequency of 13.56MHz, the signal at this frequency will form a strong eddy current effect when encountering metal and other conductive objects, and the signal strength will vary with the structure of the mobile terminal. Changes, resulting in huge fluctuations in field strength on the NFC card receiving antenna, making it impossible to perform distance control without calibration

[0009] To sum up, in the prior art, whether it is a mobile terminal proximity solution based on a radio frequency SIM card or NFC technology, it is impossible to use the same threshold to control the distance of each terminal, that is, it is impossible to realize distance control without calibration

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