Method of switching speech path in radiotelephone system

Details Method of switching speech path in radiotelephone system Method of switching speech path in radiotelephone system

1990-08-16

1992-12-08

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 671, 455 89, 379 59, 379 61, H04B 700

Patent

active

051704889

ABSTRACT:
A speech path switching method for use in a radiotelephone system suitable for a private branch radio exchange system. In the radiotelephone system, portable-type cordless telephone sets are respectively connected via intrasystem base stations each disposed in an associated location in the system and each provided with a radio transmission and reception function, a portable-type cordless telephone set in use for a speech transmits, in order to change a combination with a base station, a speech path switch request through a manual operation or in an automatic manner to available base stations existing in the proximity of the base station currently being linked with the telephone set. Each base station sequentially sends a response signal in reply to the speech path switch request such that the telephone set monitors a reception level of the response signal to determine as a switch destination a base station of which the response signal develops a highest reception level as a result of the monitor operation. The telephone set instructs a selective initiation of the base station as the switch destination via the base station having been linked with the telephone set. Thereafter, a speech is carried out via a speech path in a combination of the telephone set and the destination base station. With the provision above, a speech path having a high reception level can be manually or automatically re-established at a desired point of time in a short period of time.

REFERENCES:
patent: 3906166 (1975-09-01), Cooper et al.
patent: 4737978 (1988-04-01), Burke et al.
patent: 4765753 (1988-08-01), Schmidt
patent: 4879740 (1989-11-01), Nagashima et al.

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