Monitoring of call information in a wireless location system
US6782264B2 · kind B2 · utility
248Cited by
49References
68Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 18, 2001 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | May 28, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W76/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In an overlay Wireless Location System, an Abis interface is monitored to obtain information used to locate GSM phones. Signaling links of the Abis interface are passively monitored to obtain certain information, such as control and traffic channel assignment, called number, and mobile identification, which is not available from the GSM air interface of the reverse channel. This approach also applies to IDEN and can be broadened to include CDMA systems where the GSM architecture has been used and the system includes a separated BTS to BSC interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.