Patents by Inventor Dag E. Akerberg

Dag E. Akerberg has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5533027
    Abstract: An arrangement for radio communication includes a first radio station or base station, a number of second radio stations, and a number of subscriber stations. The second radio stations each include a digital radio arrangement and first and second devices for, respectively, communicating with the first station and with a subscriber station. The first device includes a long-range antenna for communication with the first station. The second device includes an antenna for communication with at least one of the subscriber stations. The digital radio arrangement includes a radio switch having a common transceiver providing wireless communication with the first station as well as with a subscriber station.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: July 2, 1996
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Dag E. Akerberg, Petrus van de Berg
  • Patent number: 5150362
    Abstract: In a cellular mobile radio system a method of choosing at a mobile station an appropriate base station and time slot on a time division multiplexed radio channel for the purpose of call set up or handover, wherein each base station transmits in one time slot of a predetermined control radio channel and, at least once during a multiframe, in each communication radio channel time slot used by the base station for calls, roaming signals comprising information on identity of transmitting base station and communication radio channels available at transmitting base station, the mobile scanning the control and communication channels and when desirous of call set up or handover selecting a base station and a time slot on a communication channel, the mobile desirous of call set up or handover transmitting to the choosen base information on mobile identity and the choosen communication channel time slot.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: September 22, 1992
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 5109527
    Abstract: A method of communication in at least one cellular mobile radio system in an environment of additional mobile radio systems with mobile stations capable of communication with more than one of the systems on any of a predetermined group of radio channels, not all systems being capable and allowed to use all of the radio channels in the predetermined group, wherein all base stations transmit on at least one of the radio channels in the group information regarding system and base identity and the channels of the system, wherein a mobile station is prevented from transmitting on any of the radio channels until after receiving information on base and system identify and the channels of the system, and the allocation of a radio channel in the group for a call is determined by a mobile seizing an idle channel.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: April 28, 1992
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4980907
    Abstract: The invention relates to a combination of a switched telecommunication network, a telepoint connected to the network and a portable radio terminal constituting part of a residential equipment or an extension to a PABX, the portable radio terminal when served by a telepoint radio transceiver instead of its residential or exchange radio transceiver uses the telepoint and the network for calling its residential base radio station or PABX and reporting serving telepoint to a location store, calls to the portable radio terminal thereafter being transferred by the residential equipment or PABX through the network to the telepoint in accordance with information in the location store, whereby the portable radio terminal or cordless telephone may be called through the network and telepoint when in proximity of a telepoint.
    Type: Grant
    Filed: December 15, 1989
    Date of Patent: December 25, 1990
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventors: Alex K. Raith, Bengt Y. Persson, Dag E. Akerberg
  • Patent number: 4764928
    Abstract: In a method of establishing, in the reception of messages in the form of characters sent by radio, particularly messages to personnel locators, that the latest of the received messages is identical with a previously received and stored message, there is included identifying the message with guidance from an identity code transmitted in the message. The code is either a part, i.e. a so-called block of the message or a character combination in the message. There is further included giving particular treatment to a received message with the same identity code as one already stored such as ignoring it.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: August 16, 1988
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4759022
    Abstract: In a method of receiving messages transmitted by radio in the form of coded characters, there is included storing a message in blocks together with error indications pertaining to the same, storing the same repeated messages in a register, and then combining a final version of the message from the blocks associated with the stored messages and containing the least number of errors. For guidance in the combination of blocks from different messages, there is an identity code inserted in each message. There are further included inserting, and searching for, characters in the messages pertaining to repetititon of the messages, the number of blocks in the messages and joining several messages into a continuous message.
    Type: Grant
    Filed: June 30, 1986
    Date of Patent: July 19, 1988
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4731812
    Abstract: In an installation containing at least one stationary unit (5) with a radio transmitter and a radio receiver, both with short range, and at least one, and 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 to exchange telephone calls simultaneously 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 receivers (10, 32).
    Type: Grant
    Filed: December 19, 1986
    Date of Patent: March 15, 1988
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4709402
    Abstract: In transmission by radio of personal paging calls synchronous radio transmission from several transmitters is often used, i.e. the transmitters send on the same frequency. The characters of the call must also be sent simultaneously from the transmitters so that they shall be correctly comprehended by the receivers. A method and an apparatus are described here for synchronizing the separate transmitters (2:2, 3:16) such as to transmit on the same frequency.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: November 24, 1987
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4709401
    Abstract: In a radio paging system wherein paging calls are initiated by a central radio station and sent over lines to subordinate radio stations for transmission to paging devices, the subordinate stations are synchronized to transmit paging messages by introducing time delays between reception of a message from the central radio station before transmission, the time delays being functions of the message transmit times via the lines to the various other stations as well as the radio propogation time between the other stations.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: November 24, 1987
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4682350
    Abstract: A method of connecting audio information between a base telephone unit which is stationary and a portable unit associated therewith, the method involving dividing the communication time for audio information into first and second periods. During each first period, transmitting audio information from one of the units to the other over a radio channel and during each second period transmitting in reverse direction. The duration of the periods is a function of which transmitter is active at a given time.
    Type: Grant
    Filed: April 10, 1986
    Date of Patent: July 21, 1987
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg
  • Patent number: 4628152
    Abstract: A method and an equipment for wireless transmission of telephone calls between a stationary unit (1) connected to a telephone set (3) at a short distance from the stationary unit provides that all pairs of units (1, 3) have access to a plurality of common duplex radio speech channels for transmission of calls, and to a common radio signalling channel for transmission of signals referring to connection and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened to before a call, and a channel selected which is idle with respect to calls. The selection of an idle channel takes place automatically with the use of radio receivers (12, 25), channel selectors (15, 28) and circuits (16, 29) incorporated in both units.
    Type: Grant
    Filed: August 11, 1983
    Date of Patent: December 9, 1986
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Dag E. Akerberg