Patent ID: 8682271

Claim:
A method for improving communication distance accuracy of a transaction system via temperature compensation is used for communications between a mobile terminal and a card reader in the transaction system, wherein the card reader includes an radio-frequency (“RF”) card read device and the mobile terminal includes an RF SIM card, and wherein the RF card read device includes a card read micro-controller, a card read RF module, a card read antenna, and a temperature sensor, the method includes following steps: A. reading out a pre-configured reference temperature value via the card read micro-controller, wherein when an ambient temperature is different from the pre-configured reference temperature value, the card read micro-controller compensates a detected field intensity or an equivalent value of the detected field intensity to reduce a field intensity difference caused by different temperatures; B. reading out a pre-configured field intensity threshold via the card read micro-controller; C. reading out by the card read micro-controller, via the RF module, an RF field intensity or an equivalent value of the RF field intensity of the RF SIM card, which is received by the card read antenna; D. reading out via the card read micro-controller an ambient temperature detected by the temperature sensor, and determining if the detected ambient temperature is different from the pre-configured reference temperature value; if yes, performing pre-configured temperature compensation to the read-out field intensity or equivalent value of the field intensity; E. determining via the card read micro-controller whether the compensated field intensity or equivalent value of the field intensity processed by Step D is bigger than the pre-configured field intensity threshold; if yes, providing a suitable distance determination; otherwise, providing an unsuitable distance determination; and F. transmitting the distance suitability determination of Step E to the RF SIM card by the card read micro-controller via the card read RF module and the card read antenna.