Indoor location detection using combined radio frequency signal and audio frequency signal beacon system
US9955315B2 · kind B2 · utility
1Cited by
1References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2015 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | May 19, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/33
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mobile terminal is operated by receiving a first signal and a second signal, determining a signal strength of the first signal, and determining an indoor location of the mobile terminal based on the signal strength of the first signal and the second signal. The first signal is a radio frequency signal and the second signal is an audio frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.