Portable telephone apparatus for achieving roaming with a...

Details Portable telephone apparatus for achieving roaming with a... Portable telephone apparatus for achieving roaming with a...

2005-09-27

2005-09-27

Ferguson, Keith (Department: 2683)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S553100, C455S550100, C455S422100, C455S426100, C455S412100, C455S435200, C455S434000

Reexamination Certificate

active

06950676

ABSTRACT:
A portable telephone apparatus that achieves international roaming inexpensively by performing roaming between mobile telephone systems that use different communication protocols. In detail, if the present apparatus, in an initialization state, receives a sync channel message generated from a base station, the portable telephone apparatus reads a P_REV message which shows the communication protocol used in the mobile phone system. When the communication protocol is T53, the portable telephone apparatus performs a plurality of procedures from an idle state through to a traffic channel state in a standard manner, but when the communication protocol is IS-95, the potable telephone apparatus controls wireless communication by replacing one procedure of the plurality of procedures performed from the idle state through to the traffic channel state with another procedure.

REFERENCES:
patent: 5946634 (1999-08-01), Korpela
patent: 6223030 (2001-04-01), Van Den Heuvel et al.
patent: 6594505 (2003-07-01), Ishii
patent: 6731957 (2004-05-01), Shamoto et al.
patent: 2003/0017842 (2003-01-01), Moles et al.
patent: 09-163450 (1997-06-01), None
patent: 11-346383 (1999-12-01), None
“Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System,” TIA/EIA Interim Standard, TIA/EIA/IS-95-A, May 1995, Telecommunications Industry Association.

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