# US 2013/0252544 A1 · Interface Deactivation for Communication Between Electronic Appliances > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0252544 A1 - Document ID: US20130252544A1 - Status: Published application - Kind: A1 - Application number: 13/847,786 - Filed: 2013-03-20 - Published: 2013-09-26 - Earliest claimed: 2012-03-21 - Assignees: Infineon Technologies AG - Applicants: Infineon Technologies AG - Inventors: Thomas Leutgeb; Walter Kargl; Josef Riegebauer - Web page: https://patentgrep.com/patent/US20130252544A1 ## CPC - H04B 5/20: characterised by the transmission technique; characterised by the transmission medium - H04B: TRANSMISSION ## Abstract A method for controlling the flow of data in a near field communication appliance having an interposed element and a plurality of secure elements is disclosed. The method includes: receiving a first communication, sent by an external appliance, which is intended for an application located in one of the secure elements; determining whether a first one of the secure elements contains the application; and deactivating an interface from the interposed element to the first secure element if the first secure element does not contain the application. Corresponding systems and appliances for near field communication are also disclosed. ## Claims ### Claim 1 A method for controlling the flow of data in a near field communication appliance having an interposed element and a plurality of secure elements connected to the interposed element, the method comprising: receiving a first communication, sent by an external appliance, which is intended for an application located in one of the secure elements; determining whether a first one of the secure elements contains the application; and deactivating an interface from the interposed element to the first secure element if the first secure element does not contain the application. ### Claim 2 (depends on 1) The method of claim 1, wherein the first secure element begins communication with the external appliance if the first secure element contains the application. ### Claim 3 (depends on 1) The method of claim 1, wherein the interposed element determines whether the first secure element contains the application, and wherein the interposed element forwards the first communication to a second one of the secure elements if the first secure element does not contain the application. ### Claim 4 (depends on 1) The method of claim 1, wherein the interposed element deactivates the interface no later than after a defined time tinterface—off if the first secure element does not contain the application. ### Claim 5 (depends on 1) The method of claim 1, further comprising buffer-storing the first communication in the interposed element. ### Claim 6 (depends on 1) The method of claim 1, further comprising beginning a transparent communication between the external appliance and the secure element which contains the application. ### Claim 7 (depends on 1) The method of claim 1, wherein the external appliance is an NFC reader and the near field communication appliance is a mobile terminal with an NFC function. ### Claim 8 (depends on 1) The method of claim 1, wherein the interposed element is an NFC frontend. ### Claim 9 (depends on 1) The method of claim 1, further comprising measuring in order to prevent data collisions between the secure elements by using targeted power management. ### Claim 10 (depends on 1) The method of claim 1, wherein the communication between the external appliance and the near field communication appliance is based on ISO 14443. ### Claim 11 (depends on 10) The method of claim 10, wherein information at a level of ISO 14443 layer 3 is handled by one of the secure elements or by the interposed element. ### Claim 12 A near field communication system, comprising: a near field communication appliance, comprising: a plurality of secure elements; and an interposed element connected to the secure elements, wherein the near field communication appliance is operable to: receive a first communication, sent by an external appliance, which is intended for an application located in one of the secure elements; determine whether a first one of the secure elements contains the application; and deactivate an interface from the interposed element to the first secure element if the first secure element does not contain the application. ### Claim 13 (depends on 12) The near field communication system of claim 12, wherein the first secure element is operable to begin communication with the external appliance if the first secure element contains the application. ### Claim 14 (depends on 12) The near field communication system of claim 12, wherein the interposed element is operable to determine whether the first secure element contains the application and forward the first communication to a second one of the secure elements if the first secure element does not contain the application. ### Claim 15 (depends on 12) The near field communication system of claim 12, wherein the interposed element is operable to deactivate the interface no later than after a defined time tinterface—off if the first secure element does not contain the application. ### Claim 16 (depends on 12) The near field communication system of claim 12, wherein the near field communication appliance is further operable to buffer-store the first communication in the interposed element. ### Claim 17 (depends on 12) The near field communication system of claim 12, wherein the near field communication appliance is further operable to begin a transparent communication between the external appliance and the secure element which contains the application. ### Claim 18 (depends on 12) The near field communication system of claim 12, wherein the external appliance is an NFC reader and the near field communication appliance is a mobile terminal with an NFC function. ### Claim 19 (depends on 12) The near field communication system of claim 12, wherein the near field communication system is a mobile terminal. ### Claim 20 A method for controlling the flow of data in a near field communication appliance having an interposed element and a plurality of secure elements, the method comprising: receiving a first communication, sent by an external appliance, which is intended for an application located in one of the secure elements; determining which one of the secure elements contains the application; and ensuring that further communication takes place exclusively between the external appliance and the secure element which contains the application.