Multiplex communications – Wide area network – Packet switching
Patent
1990-08-30
1993-05-18
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 79, 379 61, 455 331, 455 541, H04B 726, H04L 514, H04Q 702, H04Q 704
Patent
active
052126846
ABSTRACT:
A communications system suitable for use with hand portable radio telephones operating in a cellular mode, the typical cell size being between 500 m and 3 km radius. Each cell comprising at least one primary or base station (10) connected to the PSTN and one or more secondary portable stations (14) which are capable of roaming within the cell. Radio communication between the stations can be initiated by either station. Each primary and secondary station having radio transceiving means for time division duplex communication between the stations, a codec operating at 32 kbits/second or 11.4 kbits/second and means for transmitting digitised speech in accordance with a framed structure comprising 3 full rate or 6 half rate channels per carriers, the carrier being modulated at a carrier bit rate of substantially 270.8333 kbits/second. Provision is made for internal and external handover, if required. Also, if required, the secondary station can be constructed to operate in the DECT system as well as in the above described system.
REFERENCES:
patent: 4989230 (1991-01-01), Gillig et al.
patent: 5117449 (1992-05-01), Metroka et al.
MacNamee Robert J. G.
Vadgama Sunil K.
Chin Wellington
Treacy David R.
U.S. Philips Corporation
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