Patents by Inventor Dag E. .ANG.kerberg

Dag E. .ANG.kerberg 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).

  • Method of transmitting call information in a short range mobile telephone system and a radio unit for carrying out the method
    Patent number: 5134710
    Abstract: A method of transmitting calls between a radio base station (FS) and one or more portable radio telephones (PS) which are at a short distance from the base station. The base stations of the mobile radio system all have access to all carrier frequencies (f.sub.1 -f.sub.4) and transmit/receive call information with the aid of time division multiple access (TDMA). The transmission from a base station (FS) to a radio telephone (PS) occupies time slots (CH1-CH16) within one half of a frame interval and the reception occupies time slots within the other half. When a channel occupies a time slot (CH1) for transmission/reception over a given carrier frequency (f.sub.1) the remaining carrier frequencies are blocked for precisely this time slot, and a second time slot with the same (f.sub.1) or a second carrier frequency (f.sub.1 -f.sub.4) shall be used for a second channel. A radio unit for carrying out the method is described.
    Type: Grant
    Filed: June 8, 1989
    Date of Patent: July 28, 1992
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Dag E. .ANG.kerberg