Protocol and transceiver for cordless/cellular telephone service
First Claim
1. A communications system comprising a dual mode hand portable transceiver for metropolitan cellular and cordless telecommunications use, forming a secondary station, and a primary station, the primary and secondary stations each comprising respective radio transceiving means for duplex radio communication between the stations, said primary and secondary stations each further comprising:
- a single encoding means for digitizing speech to form transmitter digitized speech signals, and a single decoding means for recovering speech from received digitized speech signals, andmeans for formatting said digitized speech signals to produce a modulation signal according to a selected one of first and second protocols, selection of the protocol being responsive to control by a user of the transceiver, said first protocol using 3 full rate channels per carrier, with each channel carrying signals at substantially 32 kbits per second; and
said second protocol using 2 half rate duplex channels carrying signals at substantially 11.4 kbits per second, andeach respective transceiver comprising a single transmitter means for modulating a carrier with said modulation signal at a carrier bit rate of substantially 270.8333 kbits per second, and transmitting the resultant formatted transmitter digitized speech signals over a duplex channel system.
3 Assignments
0 Petitions
Accused Products
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.
-
Citations
24 Claims
-
1. A communications system comprising a dual mode hand portable transceiver for metropolitan cellular and cordless telecommunications use, forming a secondary station, and a primary station, the primary and secondary stations each comprising respective radio transceiving means for duplex radio communication between the stations, said primary and secondary stations each further comprising:
-
a single encoding means for digitizing speech to form transmitter digitized speech signals, and a single decoding means for recovering speech from received digitized speech signals, and means for formatting said digitized speech signals to produce a modulation signal according to a selected one of first and second protocols, selection of the protocol being responsive to control by a user of the transceiver, said first protocol using 3 full rate channels per carrier, with each channel carrying signals at substantially 32 kbits per second; and
said second protocol using 2 half rate duplex channels carrying signals at substantially 11.4 kbits per second, andeach respective transceiver comprising a single transmitter means for modulating a carrier with said modulation signal at a carrier bit rate of substantially 270.8333 kbits per second, and transmitting the resultant formatted transmitter digitized speech signals over a duplex channel system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A dual mode hand portable transceiver for metropolitan cellular and cordless telecommunications use, comprising:
-
a single encoding means for digitizing speech to form transmitter digitized speech signals, and decoding means for recovering speech from received digitized speech signals, a single means for formatting said digitized speech signals to produce a modulation signal according to a selected one of first and second protocols, selection of the protocol being responsive to control by a user of the transceiver, said first protocol using 3 full rate channels per carrier, with each channel carrying signals at substantially 32 kbits per second; and
said second protocol using 2 half rate duplex channels carrying signals at substantially 11.4 kbits per second, anda single means for modulating a carrier with said modulation signal at a carrier bit rate of substantially 270.8333 kbits per second, and transmitting the resultant formatted transmitter digitized speech signals over a duplex channel system. - View Dependent Claims (19, 20, 21, 22, 23, 24)
-
Specification