# US 10,122,841 B2 · Smartphone proximity card emulation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,841 B2 - Document ID: US10122841B2 - Status: Granted - Kind: B2 - Application number: 15/233,323 - Filed: 2016-08-10 - Published: 2016-12-01 - Granted: 2018-11-06 - Earliest claimed: 2013-04-05 - Assignees: Microsoft Technology Licensing, LLC - Applicants: Microsoft Technology Licensing, LLC - Inventors: Alex McKelvey - Web page: https://patentgrep.com/patent/US10122841B2 ## CPC - H04W 4/023: {using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds} - G06K 19/0727: {the arrangement being a circuit facilitating integration of the record carrier with a hand-held device such as a smart phone of PDA} - H02J 7/40: characterised by the exchange of charge or discharge related data - H02J 50/12: of the resonant type - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H04B 5/79: for data transfer in combination with power transfer - H04W 4/02: Services making use of location information - H04W 12/06: Authentication - H04M 1/72412: using two-way short-range wireless interfaces - H04M 2250/04: including near field communication means, e.g. RFID - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H04B: TRANSMISSION - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) ## Abstract Methods, systems, and computer program products are provided that enable a portable computing device to emulate a proximity card. A portable computing device is provided that includes an antenna, storage that stores an identification number, and a processor. The processor is configured to control modulation of the identification number onto a carrier signal received by the antenna from a proximity card reader device. In this manner, an applicable function may be enabled, and the portable computing device emulates a proximity card. The antenna may be specific to proximity card emulation, or may be shared with other portable computing device functions, such as wireless charging. ## Claims ### Claim 1 A portable computing device, comprising: an antenna; storage that stores an identification number; and a processor configured to control modulation of the identification number onto an unmodulated carrier signal received by the antenna from a proximity card reader device to enable the portable computing device to emulate a proximity card; wherein the portable computing device is configured to emulate a proximity card by responding to the proximity card reader device in a first mode using the antenna, and to receive a wireless charging signal from a wireless charger using the antenna to charge a rechargeable battery in a second mode, the processor enabling the identification number to be modulated onto the unmodulated carrier signal for a predetermined time duration, and causing the portable computing device to enter the second mode after expiration of the predetermined time duration to wirelessly charge the rechargeable battery. ### Claim 2 (depends on 1) The portable computing device of claim 1, wherein the portable computing device is a smartphone. ### Claim 3 (depends on 1) The portable computing device of claim 1, wherein the antenna is configured for a kilohertz frequency range. ### Claim 4 (depends on 1) The portable computing device of claim 1, further comprising: a carrier detection module configured to determine whether a received signal is a wireless signal transmitted by the wireless charger or is the carrier signal received from the proximity card reader device; and the carrier detection module provides an indication of the carrier signal to the processor when the wireless signal is determined to be transmitted by the proximity card reader device. ### Claim 5 (depends on 4) The portable computing device of claim 4, wherein the carrier detection module is configured to measure an amplitude of the wireless signal, to determine the wireless signal to be transmitted by the wireless charger if the measured amplitude is greater than a predetermined threshold value, and to determine the wireless signal to be the carrier signal received from the proximity card reader device if the measured amplitude is less than the predetermined threshold value. ### Claim 6 (depends on 4) The portable computing device of claim 4, wherein the carrier detection module is configured to determine the wireless signal to be transmitted by the wireless charger if the wireless signal includes a wireless power transfer communication. ### Claim 7 (depends on 4) The portable computing device of claim 4, wherein the processor receives the carrier signal indication on a general purpose input-output port. ### Claim 8 (depends on 1) The portable computing device of claim 1, further comprising: a modulation circuit coupled between the processor and the antenna; the processor configured to retrieve the identification number from the storage and to provide the identification number to the modulation circuit according to a predetermined timing; and the modulation circuit configured to modulate the identification number onto the carrier signal at the antenna according to the predetermined timing. ### Claim 9 (depends on 8) The portable computing device of claim 8, wherein the predetermined timing is configured to synchronize bits of the identification number with a frequency of the carrier signal. ### Claim 10 (depends on 8) The portable computing device of claim 8, wherein the processor transmits the identification number to the modulation circuit from a serial port. ### Claim 11 (depends on 1) The portable computing device of claim 1, further comprising: a wireless charging controller coupled to the antenna to enable a rechargeable battery of the portable computing device to be wirelessly charged by a wireless charging signal received by the antenna; the processor configured to disable wireless charging of the rechargeable battery when the identification number is being modulated onto the carrier signal; and the processor configured to enable wireless charging of the rechargeable battery when the identification number is not being modulated onto the carrier signal. ### Claim 12 A method in a portable computing device, comprising: operating in a first mode to emulate a proximity card, including receiving an unmodulated carrier signal transmitted by a proximity card reader device at an antenna of the portable computing device, accessing an identification number stored in storage of the portable computing device, and modulating the identification number onto the unmodulated carrier signal for a predetermined time duration to enable the portable computing device to emulate a proximity card; and operating in a second mode for wireless charging after expiration of the predetermined time duration, including receiving a wireless charging signal from a wireless charger using the antenna, and charging a rechargeable battery of the portable computing device with the charge from the wireless charging signal. ### Claim 13 (depends on 12) The method of claim 12, further comprising: disabling wireless charging capability associated with the antenna to operate in the first mode; performing said modulating of the identification number onto the carrier signal; and enabling wireless charging capability associated with the antenna to operate in the second mode. ### Claim 14 (depends on 13) The method of claim 13, further comprising: determining whether a received wireless signal is transmitted by a wireless charger or is the carrier signal received from the proximity card reader device; and when the wireless signal is determined to be the carrier signal received from the proximity card reader device, performing said disabling of wireless charging capability associated with the antenna to operate in the first mode, and performing said modulating of the identification number onto the carrier signal. ### Claim 15 (depends on 14) The method of claim 14, wherein said determining whether a received wireless signal is transmitted by a wireless charger or is the carrier signal received from the proximity card reader device comprises: measuring an amplitude of the wireless signal; determining the wireless signal to be transmitted by the wireless charger if the measured amplitude is greater than a predetermined threshold value; and determining the wireless signal to be the carrier signal received from the proximity card reader device if the measured amplitude is less than the predetermined threshold value. ### Claim 16 (depends on 13) The method of claim 13, wherein said determining whether a received wireless signal is transmitted by a wireless charger or is the carrier signal received from the proximity card reader device comprises: determining whether the wireless signal includes a wireless power transfer communication. ### Claim 17 (depends on 12) The method of claim 12, wherein the portable computing device is a smartphone. ### Claim 18 (depends on 12) The method of claim 12, wherein the antenna is configured for a kilohertz frequency range. ### Claim 19 A computer readable storage medium having computer program instructions stored in the computer readable storage medium that enable a processor to perform a method in a portable computing device, the method comprising: accessing an identification number stored in storage of the portable computing device; receiving an indication of an unmodulated carrier signal received at an antenna of the portable computing device from a proximity card reader device; disabling wireless charging capability associated with the antenna to operate in a first mode; providing the identification number to a modulation circuit of the portable computing device according to predetermined timing for a predetermined time duration to modulate the identification number onto the unmodulated carrier signal by the antenna to enable the portable computing device to emulate a proximity card; and enabling wireless charging capability associated with the antenna to operate in a second mode after expiration of the predetermined time duration. ### Claim 20 (depends on 19) The computer readable storage medium of claim 19, wherein the portable computing device is a smartphone.