Method and apparatus for initiating communication on an assigned frequency
US5239677A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1991 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Jul 1, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A portable transceiver system (100) has at least one base site (200) capable of communicating with at least one of a plurality of portable transceivers (108). The at least one base site (200) comprises communicators communicating on first and second frequencies (301, 302). The first frequency (301) comprises a plurality of sub-frequencies for communicating from the at least one base site to the plurality of portable transceivers (108), and the second frequency (302) comprises a plurality of time-slots for receiving call initiation signals from the plurality of portable transceivers (108). The at least one base site (100) further comprises a receiver (214) and a detector (218) receiving and detecting, respectively, when the call initiation signal is received from one of the plurality of portable transceivers (108), a channel assignor (220), coupled to the detector (218), allocates a frequency assignment for communicating with an initiating portable transceiver (108) on one of the plurality of sub-frequencies of the first frequency (321), and a transmitter (210) transmitting the frequency assignment to the plurality of portable transceivers (108). Each of the plurality of portable tr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.