Radio frequency (RF) power detector for antenna mode detection

Patent metadata

Field	Value
Publication number	US-11516742-B2
Application number	US-202117158371-A
Country	US
Kind code	B2
Filing date	Jan 26, 2021
Priority date	May 14, 2018
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

In accordance with some embodiments, an apparatus for privacy protection includes a housing arranged to hold a second device, a local communication device at least partially supported by the housing, and a controller, where the apparatus is associated with a radio frequency (RF) power detector. The RF power detector monitors energy emitted from one or more antennas of the second device in response to determining that the second device indicates that the second device has transitioned from a first mode of operation to a second mode of operation. The apparatus further establishes a communication channel between the apparatus and the second device, and obtains, through the communication channel, a communication status of the second device. The apparatus can then report compromise of the second device upon determining that a discrepancy between the communication status and the energy emission.

First claim

What is claimed is:

1. A method comprising:
at an apparatus including a housing arranged to hold a personal communication device, one or more communication devices at least partially supported by the housing, and a controller coupled to the one or more communication devices and connectable to a radio frequency (RF) power detector:
receiving, from the RF power detector, an indication of a communication between the personal communication device and a remote device;
obtaining, via a local communication device of the one or more communication devices, a communication status reported by the personal communication device;
directing the RF power detector to derive characteristics of the communication; and
reporting compromise of the personal communication device based on the characteristics of the communication and the communication status reported by the personal communication device.

2. The method of claim 1 , wherein reporting the compromise of the personal communication device based on the characteristics of the communication and the communication status reported by the personal communication device includes:
reporting the compromise of the personal communication device based on the characteristics of the communication indicating the personal communication device is in communication with the remote device and the communication status reported by the personal communication device indicating one or more antennas on the personal communication are disabled.

3. The method of claim 1 , further comprising:
enabling the RF power detector to detect communication signals to or from the personal communication device in response to detecting that the personal communication device has indicated disabling of one or more antennas on the personal communication device.

4. The method of claim 1 , further comprising:
activating a local communication channel between the personal communication device and the apparatus in response to detecting that the personal communication device has indicated disabling of one or more antennas on the personal communication device.

5. The method of claim 1 , wherein reporting the compromise of the personal communication device includes one or more of disabling RF transmission from the personal communication device, controlling communication path from the personal communication device, controlling data path from the personal communication device, and providing an alert to a user of the personal communication device.

6. The method of claim 1 , wherein reporting compromise of the personal communication device includes sending, via a remote communication device of the one or more communication devices, the characteristics to a secure server, and the method further includes:
causing the secure server to map the remote device as a rogue base station based on assessment of the characteristics and aggregated data from a plurality of apparatuses.

7. The method of claim 1 , wherein deriving the characteristics of the communication includes:
obtaining characteristics of a communication protocol associated with the communication by matching a communication protocol signature with waveforms of a communication signal carrying the communication, wherein the characteristics of the communication protocol include at least one of a communication protocol, a frequency, a bandwidth, a peak-to-average-power ratio (PAPR), or a power level of the communication signal.

8. The method of claim 1 , wherein deriving the characteristics of the communication includes:
deriving cell tower characteristics of the remote device, including an identifier of the remote device.

9. The method of claim 1 , further comprising:
obtaining, via local communication device, Subscriber Identity Module (SIM) information from a SIM slot of the personal communication device; and
extracting a TCP/IP header from packets in the communication by applying a cipher key included in the SIM information to the packets.

10. The method of claim 1 , wherein the communication status reported by the personal communication device indicates whether or not one or more antennas on the personal communication device have been disabled.

11. The method of claim 1 , further comprising:
disabling, without user intervention, the RF power detector in response to detecting that the communication status indicates the personal communication device is not in a mode associated with disabling of one or more antennas on the personal communication device.

12. An apparatus comprising:
a housing arranged to hold a personal communication device;
one or more communication devices, at least partially supported by the housing, connectable to the personal communication device, wherein the one or more communication devices include a local communication device; and
a controller, coupled to the one or more devices and connectable to a radio frequency (RF) power detector, wherein the controller is operable to:
receive, from the RF power detector, an indication of a communication between the personal communication device and a remote device;
obtain, via the local communication device, a communication status reported by the personal communication device;
direct the RF power detector to derive characteristics of the communication; and
report compromise of the personal communication device based on the characteristics of the communication and the communication status reported by the personal communication device.

13. The apparatus of claim 12 , wherein reporting the compromise of the personal communication device includes one or more of disabling RF transmission from the personal communication device, controlling communication path from the personal communication device, controlling data path from the personal communication device, and providing an alert to a user of the personal communication device.

14. The apparatus of claim 12 , wherein the controller is further operable to:
detect, via the local communication device, the personal communication device has indicated that one or more antennas on the personal communication device have been turned off; and
enable the RF power detector to monitor communications to or from the personal communication device.

15. The apparatus of claim 12 , wherein the controller is further operable to:
direct the local communication device to pair with a communication device on the personal communication device.

16. The apparatus of claim 12 , wherein the one or more communication devices includes a remote communication device connectable to a secure server and operable to send the characteristics of the communication to the secure server and receive a command from the remote server to be executed on the personal communication device.

17. A device comprising:
a peripheral interface connectable to an apparatus, wherein the device is attachable to the apparatus, and the apparatus includes a housing arranged to hold the personal communication device and connectable to the personal communication device via a local communication channel;
a radio frequency (RF) power detector operable to detect energy carrying a communication signal to or from the personal communication device; and
a microcontroller coupled to the peripheral interface and the RF detection device, wherein the microcontroller is operable to:
receive, via the peripheral interface, an instruction from the apparatus to monitor the personal communication device;
direct the RF power detector to monitor the personal communication device;
receive, from the RF power detector, detection of a communication between the personal communication devi

Assignees

• Ppip Llc

Inventors

• Fong Michael
• Fong Neric Hsin-Wu
• Thomas Teddy David

Classifications

• H04M1/72463

  to restrict the functionality of the device · CPC title

• H04M1/72454

  according to context-related or environment-related conditions · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04B17/102

  Power radiated at antenna · CPC title

• H04M1/19

  Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor (circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14) · CPC title