Methods and apparatus for identifying asset location in communication networks
US7069025B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2001 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Jan 2, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99943
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers. Time-stamping devices may include correlator circuits in parallel with signal decoders to time-stamp communication sequences. Cellular wireless networks may be frequency-multiplexed to increase spatial time-stamping density. Tags may be attached to passive assets to provide location identification information to network devices. Locations of assets broadcasting standard 802.11 radio frequency structures may be identified. Noise inherent in correlating a communication sequence may be reduced by using a selected correlation function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.