Call transfer within cellular communications system
US5579375A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1995 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | May 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/54
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method provides multiple sequential call-forwarding transfers to a sequence of C-numbers within a conventional cellular radio communications system by providing a unique identifier for each call and enabling a home location register (HLR) to coordinate and disseminate multiple calls made to the same mobile station. The HLR stores, within a subscriber database, a sequence of C-numbers on a call-forwarding priority list to which calls are to be forwarded in the event a call cannot be completed to the mobile station. Each C-number is associated with sets of unique identification numbers and time stamps. When an incoming call is received at an originating mobile switching center (MSC), a transfer-to-number request message, containing a unique number identifying the request, is transmitted from the MSC to the HLR containing the subscriber database. In response, the HLR analyzes the request, searches the C-number priority list, and transmits to the MSC, the optimum C-number for completing the call. The HLR then updates the time stamp associated with that particular C-number and unique identifier. The MSC then attempts to complete the call. If the call cannot be completed, th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.