Call processing method in radio telephone using spread spectrum

Details Call processing method in radio telephone using spread spectrum Call processing method in radio telephone using spread spectrum

1996-12-26

1999-05-18

Pham, Chi H.

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

375206, H04J13/04

Patent

active

059057220

ABSTRACT:
A call processing method in a radio telephone, in which receiving and transmitting operations are carried out using a spread spectrum communication system in accordance with a time division duplexing, the radio telephone including a base set wire-connected to a public switching network and a plurality of handsets radio-connected to the base set and allocated with different pseudo noise codes, respectively. The method includes the steps of transmitting a ring-on message to all the handsets in every transmitting operation of the base set, once the radio telephone receives an incoming call from the public switching network, while encoding the ring-on message with the pseudo noise codes, sequentially checking whether or not a signal responding to the transmitted ring-on message is received at the base set, in every receiving operation of the base set, while replacing the pseudo noise codes one by one at a predetermined time interval, if it is determined that a signal responding to the transmitted ring-on message is received from one of the handsets, then establishing a channel between the base set and the handset transmitting the response signal, and transmitting a ring-off message to the remaining handsets while encoding the ring-off message with the pseudo noise codes respectively allocated to the remaining handsets, thereby cutting off an establishment of channels.

REFERENCES:
patent: 5325420 (1994-06-01), Kikuchi
patent: 5594776 (1997-01-01), Dent
patent: 5604732 (1997-02-01), Kim et al.
patent: 5689525 (1997-11-01), Takeishi et al.
patent: 5689549 (1997-11-01), Bertocci et al.

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