Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-11-24
2000-05-09
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455450, 455463, 455464, 455422, H04Q 734, H04Q 738
Patent
active
060615699
ABSTRACT:
A free channel double checking protocol and system are disclosed. More particularly, the system includes at least one primary radio station and a plurality of secondary radio stations, in which a secondary radio station is matched to a primary radio station and a wireless communication is established via a full duplex communication link. The primary and the secondary stations establish the communication link using a free channel double checking protocol. The free channel doubles checking protocol checks whether a free channel exists between stations. After setting up the communication link, a calling station may confirm to a called station that a reliable communication link has been established.
REFERENCES:
patent: 4897864 (1990-01-01), Murata et al.
patent: 5136629 (1992-08-01), Toyama et al.
patent: 5259020 (1993-11-01), Hirano
patent: 5644621 (1997-07-01), Yamashita et al.
patent: 5835889 (1998-11-01), Kapanen
patent: 5920620 (1999-07-01), Mori
"ETSI" document I-ETS 300 235 (Interim European Telecommunication Standard), European Telecommunications Standards Institute, Mar. 1994, pp. 9-16.
Fernandez Gabriel C. M.
Touzeau Patrick
Vaulay Thierry P. F.
Eisenzopf Reinhard J.
Piotrowski Daniel J.
Ramos-Feliciano Eliseo
U.S. Philips Corporation
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