Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1986-12-19
1988-03-15
Lev, Robert
Telephonic communications
Audio message storage, retrieval, or synthesis
379 62, H04Q 704
Patent
active
047318120
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The invention relates to installations with portable, wireless telephone sets.
BACKGROUND
Installations are known which include portable, wireless telephones and which include one or more stationary units connected to a telephone network, the portable telephones being in radio communication with these stationary units. In the installation, there are one or more pairs of portable telephone and stationary units, the rage of radio communication being limited, for example, to an apartment or house. An installation built in this way is well suited for use in dwellings, both in single-family houses and in large apartment houses. Installations of this kind are described in SE-B-8107663-0.
Adaptive channel selection is described in this publication. In each of the units, there is selected from a radio speech channel which is idle and is selected among a plurality of radio speech channels, common to all pairs. It will thus be unnecessary to plan assigning of frequencies to the wireless telephone sets.
Even earlier mobile telephone systems are known in which mobile telephones, often in automobiles, can be put into radio communication with one of a plurality of fixed radio stations. Such type of fixed station transmits on a plurality of assigned radio frequencies, adjacent fixed stations being assigned other frequencies so that disturbance or noise is avoided. Should a corresponding principle for frequency assigning be used for the portable, wireless telephones as intended in the present invention, the administration of the frequency assignment would be extremely cumbersome and the frequency economy poor.
In a large office block, the concentration of portable telephones tends to be severe, and there may be the demand that a user of a portable telephone must carry the telephone with him within the entire office block. The relation between portable telephone and stationary unit will be looser than in the case described earlier. A given stationary unit can not service a portable telephone everywhere in the large block since the transmitting power of both telephone set and stationary unit must be kept down in consideration of noise.
SUMMARY OF INVENTION
According to the invention, there is arranged in an installation (e.g. in an office block) at least one stationary unit, preferably several, with a radio transmitter and a radio receiver, and at least one, and preferably several, portable, wireless telephone sets with a radio transmitter and a radio receiver for exchanging telephone communications with one of the stationay units in the installation. Normally, the number of portable sets is greater than the number of stationary units. The stationary units are connected via a radio exchange to an office PABX telephone exchange, and via this to a telephone network.
The radio transmitters in the stationary units and in the portable telephone sets have a very short range, e.g., 20-50 m. It is thus possible to reuse radio speech channels at different places in an installation. Each radio transmitter has access to all radio speech channels. When the connection of a radio speech is made, there is selected by automatic adaptive channel selection a channel which is unoccupied for the moment, i.e. a channel which is not subject to noise at the location of the telephone set or the stationary unit. Planning channel distribution to the portable telephone sets will thus be necessary.
It may be expected that a portable telephone will be carried throughout the entire office block. If one of these sets is moved while it is being used for a speech, so that the distance between it and the stationary unit it was first in communication with increases, the intelligibility of the call decreases since all radio transmitters and radio receivers only have a short range. Instead, the portable telephone approaches another stationary unit which can provide a better connection. The radio exchange is adapted to monitor the quality of the connections and to switch over the call as required from a stationary unit to another which
REFERENCES:
patent: 4457018 (1984-06-01), Takayama
patent: 4481382 (1984-11-01), Villa-Real
patent: 4608711 (1986-08-01), Goldman
patent: 4628152 (1986-12-01), Akerberg
patent: 4658416 (1987-04-01), Tanaka
patent: 4659878 (1987-04-01), Dinkins
patent: 4661970 (1987-04-01), Akaiwa
patent: 4675863 (1987-06-01), Paneth et al.
patent: 4682350 (1987-07-01), Akerberg
Lev Robert
Telefonaktiebolaget LM Ericsson
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