Methods and apparatus for conducting financial transactions

摘要

A method of establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method comprising combining tree search and Aloha methods to establish communications between the interrogator and individual ones of the multiple wireless identification devices without collision. A system comprising an interrogator, and a plurality of wireless identification devices configured to communicate with the interrogator In a wireless fashion, the respective wireless identification devices having a unique identification number, the interrogator being configured to employ tree search and Aloha techniques to determine the unique identification numbers of the different wireless identification devices so as to be able to establish communications between the interrogator identification and individual devices without ones of the multiple wireless collision by multiple wireless identification devices attempting to respond to the interrogator at the same time.

主权项

1. A method of conducting a financial transaction via radio frequency communications, the method comprising:
causing the debiting of an account associated with a radio frequency communications device based at least in part on the determination of an identifier of the radio frequency communications device via operation of a host computer having an application program running thereon, the host computer configured to:
cause the transmission of a first wireless command from an interrogator to initiate identification of one of a population of radio frequency communications devices, the first wireless command including one or more first bits that are configured to elicit at least one response from the population of radio frequency communications devices;cause, after receipt by the interrogator of a first reply from the radio frequency communications device in response to the first wireless command, the transmission of a second wireless command from the interrogator to initiate identification of one of a subpopulation of radio frequency communications devices, the second wireless command including second bits that are configured to elicit one or more responses from the subpopulation of radio frequency communications devices;cause, after receipt by the interrogator of a second reply from the radio frequency communications device in response to the second wireless command, the determination of the identifier of the radio frequency communications device when there is no collision in response to at least the second wireless command; andcause the transmission of a third wireless command to the radio frequency communications device using the identifier of the radio frequency communications device, the third wireless command causing the radio frequency communications device to transmit a subsequent reply.