Patent EP0226610B1 successfully refreshed from Google Patents.
EP0226610B1
Expired / Lapsed
EP
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Installation with portable, wireless telephone sets
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1986-05-06
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Granted: 1990-03-14
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Expires: 2006-05-06
Abstract
Abstract In an intallation containing at least one stationary unit (5) with a radio transmitter and a ratio receiver, both with short range, and at least one, preferably several portable, wireless telephone sets (4) with a radio transmitter and a radio receiver, both with short range, for exchanging telephone messages with one of the stationary units in the installation (1, 2, 3) the stationary units (5) are each adapted simultaneously to exchange telephone calls with more than one portable telephone set (4) on radio speech channels, adaptively selected among a plurality of radio speech channels common to all radio transmitters (9, 31) and radio recivers (10, 32), there also being included a radio exchange (6) to which the stationary units (5) are connected, this radio exchange being adapted to switch a telephone call with decreasing intelligibility between a portable telephone set (4B) and a first stationary unit (5A) to a telephone call with increasing intelligibility between the same portable telephone set and a second stationary unit (5B). A compressor (20, 41) coacts with each of the radio transmitters (9, 31) for time-compressing the speech signals, and an expander (12, 42) coacts with each of the radio receivers (10, 32) for time-expanding the speech signals.
Inventors
- 👤 Dag E:Son Akerberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:03
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/733; H04W; H04W36/00; H04W36/16; H04W36/18; H04W84/00; H04W84/02; H04W84/10; H04W84/16; H04Q; H04Q2213/00; H04Q2213/13034; H04Q2213/13098; H04Q2213/1318; H04Q2213/13216; H04Q2213/1322; H04Q2213/13291; H04Q2213/13292; H04Q2213/13336; H04Q2213/1336; H04W16/00; H04W16/02; H04W56/00; H04W84/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
Installation containing at least two stationary units (5) with a radio transmitter (31) and a radio receiver (32), both with short range, and at least one, preferably several portable, wireless telephone sets (4) with a radio transmitter (9) and a radio receiver (10), both with short range, for exchanging telephone messages with one of the stationary units in the installation (1, 2, 3), wherein each stationary unit (5) is adapted for simultaneously exchanging telephone calls with a plurality of portable telephone sets (4) over radio speech channels, and is connected to a radio exchange (6), adapted for switching a telephone call in progress from a first radio speech channel with decreasing intelligibility between a portable telephone set (4B) and a first stationary unit (5A) to a second speech channel with increasing intelligibility between the same portable telephone set and a second stationary unit (5B), characterized in that the first and the second speech channels are adaptively selected amongst a plurality of unvarying radio speech channels, common to all radio transmitters (9, 31 ) and radio receivers (10, 32) in the installation.
Claim 2
Dependent Claim
181 words
Installation containing at least two stationary units (5) with a radio transmitter (31) and a radio receiver (32), both with short range, and at least one, preferably several portable, wireless telephone sets (4) with a radio transmitter (9) and a radio receiver (10), both with short range, for exchanging telephone messages with one of the stationary units in the installation (1, 2, 3), wherein each stationary unit (5) is adapted for simultaneously exchanging telephone calls with a plurality of portable telephone sets (4) over radio speech channels, and is connected to a radio exchange (6), adapted for switching a telephone call in progress from a first radio speech channel with decreasing intelligibility between a portable telephone set (4B) and a first stationary unit (5A) to a second speech channel with increasing intelligibility between the same portable telephone set and a second stationary unit (5B), characterized in that the first and the second speech channels are adaptively selected amongst a plurality of unvarying radio speech channels, common to all radio transmitters (9, 31 ) and radio receivers (10, 32) in the installation.
Claim 3
Dependent Claim
32 words
Installation as claimed in claim 1, characterized in that all the radio transmitters (9, 31) are adapted to send calling signals on a radio signalling channel common to all the radio transmitters.
Claim 4
Dependent Claim
36 words
Installation as claimed in claim 2, charac- ° terized in that all the radio transmitters (9, 31) are adapted to transmit calling signals with time shift so that adjacent transmitters will not send calling signals simultaneously.
Claim 5
Dependent Claim
34 words
Installation as claimed in claim 1, characterized in that all the radio transmitters (9, 31) are adapted to send telephone messages on a radio speech channel selected from radio speech channels with different frequencies.
Claim 6
Dependent Claim
118 words
Installation as claimed in claim 1, characterized in that all the radio transmitters (9, 31) and the radio receivers (10, 32) are adapted to exchange digitally coded telephone messages with the aid of a compressor (20, 41) coacting with each of the radio transmitters (9, 31) for time compressing of the speech signals and an expander (12, 42) coacting with each of the radio receivers (10, 32) for time expanding the speech signals, all the radio transmitters being adapted to send the telephone messages in at least one time slot, in a repeated time frame modulated on a radio frequency common to all the radio transmitters, the time slot being assigned to each individual radio transmitter as needed.
Claim 7
Dependent Claim
106 words
Installation as claimed in claim 5, characterized in that the radio exchange (6) is adapted to generate and receive on the baseband the combined time frames containing the digitally coded telephone messages (Figure 5) and to transmit and to receive respectively the messages via a line (38) to each of the stationary units (85), and that the stationary units each contain a synchronizer (35), adapted for controlling switching on and off the stationary unit transmitter (31), and in that the transmitter (31) is adapted to modulate the radio transmission with the digitally coded telephone messages and the radio receiver (32) to demodulate the received radio signals.
Claim 8
Dependent Claim
84 words
Installation as claimed in claim 5, characterized in that the stationary units (5) are adapted to transmit calling signals to the wireless telephone sets (4) on the radio speech channels which are in use for the moment, and in that the telephone sets are adapted to be locked, when in an inactive state, to one of the radio speech channels in use, the transmission of which is received in the telephone set with sufficient quality for receiving calling signals on this radio speech channel.
Claim 9
Dependent Claim
40 words
Installation as claimed in claim 7, characterized in that each stationary unit (5) is adapted continuously to send messages on at least one radio speech channel, either a genuine telephone message, or if such is not available, a fictitious message.
Claim 10
Dependent Claim
58 words
Installation as claimed in claim 8, characterized in that the portable telephone sets (4) are adapted to switch on the receivers (10) for a short duration during each time frame for receiving the message on one of the channels and to catch a possible calling signal and to switch off the receiver for the rest of the time.
References Cited (Backward Citations)
No citation records indexed.
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