Modem-based form factor sensor

An apparatus at a user equipment (UE) that is configured to be positioned in a plurality of different physical configurations, comprising:

• a processor,
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit a signal from a first antenna element;
• generate an echo signature of the signal based at least in part on detecting an echo of the signal at a second antenna element that differs from the first antenna element;
• and
• determine, by a modem sensor of the UE, that the UE is in a first physical configuration of the plurality of different physical configurations based at least in part on comparing the echo signature to a plurality of different echo signatures.

An apparatus at a user equipment (UE) that is configured to be positioned in a plurality of different physical configurations, comprising:

• means for transmitting a signal from a first antenna element;
• means for generating an echo signature of the signal based at least in part on detecting an echo of the signal at a second antenna element that differs from the first antenna element;
• and
• means for determining, by a modem sensor of the UE, that the UE is in a first physical configuration of the plurality of different physical configurations based at least in part on comparing the echo signature to a plurality of different echo signatures.

A non-transitory computer-readable medium storing code at a user equipment (UE) that is configured to be positioned in a plurality of different physical configurations, the code comprising instructions executable by a processor to cause the UE to:

• transmit a signal from a first antenna element;
• generate an echo signature of the signal based at least in part on detecting an echo of the signal at a second antenna element that differs from the first antenna element;
• and
• determine, by a modem sensor of the UE, that the UE is in a first physical configuration of the plurality of different physical configurations based at least in part on comparing the echo signature to a plurality of different echo signatures.