Patents Assigned to Inventahl AB
  • Wide area radio communication system and method for communicating in a wide area through a wide area radio communication system
    Patent number: 5666653
    Abstract: Wide area radio system comprising at least two central stations capable of maintaining communication to several peripheral stations within overlapping or adjacent service areas (110). Each central station is divided into a high frequency unit (992) and a low frequency function (991) operatively connected to said high frequency unit. Traffic interaction and coordination between said central stations in said radio system is provided through said low frequency functions (991) of said stations.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: September 9, 1997
    Assignee: Inventahl AB
    Inventor: Karl-Axel Ahl
  • Method in a TDMA radiosystem to let a central station communicate with both peripheral stations and other central stations
    Patent number: 5559795
    Abstract: Method in a digital wide area system operating in time division and comprising two or several subsystems, each of which comprises at least one central station (CS) and one or several peripheral stations (PS) and covering an area/volume (space) where the area covered basically depends on the radio optical coverage of each central station and underlaying peripheral stations, the communication within and between subsystems that are geographically spread out is created at each central station. A central station is controlled to change mode of operation to operate either as a central station for transmitting and receiving information to and from underlaying peripheral stations, or receiving and transmitting information as a peripheral station (PS) from and to another central station.
    Type: Grant
    Filed: September 16, 1994
    Date of Patent: September 24, 1996
    Assignee: Inventahl AB
    Inventor: Peter Ahl
  • Method and device in a digital communication network
    Patent number: 5313461
    Abstract: A system and method for connecting two or more peripheral stations to a central station over a common service resource. Each station is connected to one or more switching units; the common service resource is adaptively shared as a function of traffic going to and from the switching units. In one embodiment, capacity in the common service resource is divided into a series of frames, each frame having a set number of time slices, with information form one or more of the switching units being transferred within a time slice. In one such embodiment, time slices which will not be used during a particular frame due to the lack of or repetitive nature of information from a particular switching unit can be used to transfer information from a different switching unit.
    Type: Grant
    Filed: June 8, 1992
    Date of Patent: May 17, 1994
    Assignee: Inventahl AB
    Inventors: Karl-Axel Ahl, Joakim Nelson, Kaj G. Lindfors