Patents by Inventor Carl Patrik Cerwall

Carl Patrik Cerwall 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: 6546255
    Abstract: The present invention relates to a method in a cellular mobile communication system for transmitting Pages, and such a system. The cells of the system are subdivided into two classes. To which class a cell is assigned is decided by its capacity to transmit Pages or by the amount of Page responses received within the cells. When paging a mobile station, the Page is first transmitted in the cells of the first class. If no response is received to that Page, the Page is transmitted also in the cells of the second class. An advantage is that there will be fewer Pages congested due to lack of capacity for transmission. Transmitted Pages in the cells of the second class are primarily transmitted to mobile stations that are really present within those cells. Thereby the probability increases that all mobile stations will be reached by Pages intended for them.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: April 8, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Carl Patrik Cerwall, Lars Erik Westerberg
  • Patent number: 6275701
    Abstract: The present invention relates to a method and an apparatus in a mobile telecommunications system for the re-establishment of a speech connection, especially one that risks being interrupted prematurely. A parameter (Q) indicating the quality of the traffic channel (TCH) on which the speech connection is implemented, is compared to a predetermined value (Q1). If the parameter (Q) is lower than said value (Q1) the speech connection (340) is parked temporarily on a dedicated control channel (DCCH) of high quality. When a traffic channel (TCH) again becomes idle (360) the speech connection is handed over (370) to this channel, which may either be associated with the base station originally serving the speech connection or another base station in the mobile telecommunications system.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: August 14, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Carl Patrik Cerwall
  • Patent number: 6272352
    Abstract: Methods of reconfiguring a cell regarding the number of signaling channels in relation to the number of traffic channels. Each signaling channel (SDCCH/8) contains a number of dedicated control channels (SDCCH), wherein a number of dedicated control channels are included in a basic configuration of control channels. If the channel utilization indicates that a basic configuration of control channels is congested for more than a certain percentage of time, a dedicated control channel is added to the basic configuration. If it is determined that the basic configuration, less one control channel, is congested less than a certain percentage of time then a control channel is removed from the basic configuration.
    Type: Grant
    Filed: October 27, 1998
    Date of Patent: August 7, 2001
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Carl Patrik Cerwall, Anna Helleberg
  • Patent number: 6157839
    Abstract: This invention relates to methods of initiating a reconfiguration of a cell regarding the number of signalling channels in relation to the number of traffic channels. Each signalling channel (SDCCH/8) contains a number of dedicated control channels (SDCCH). The invention can be divided into two parts, an increase condition in which a traffic channel (TCH) is converted to a signalling channel (SDCCH/8) and a decrease condition in which a signalling channel is reconverted to a traffic channel. These two conditions can be performed independently of each other. In the increase condition, the conversion to a signalling channel is done based on three conditions (1,2,3; FIG. 3) depending on the number of idle dedicated channels (SDCCH) and the number of traffic channels (TCH). In the decrease condition, the conversion (FIG. 4; FIG. 5) is based on the number of signalling channels (SDCCH/8) and the dedicated control channels (SDCCH) in the cell.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: December 5, 2000
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Carl Patrik Cerwall, Anna Helleberg
  • Patent number: 6032047
    Abstract: A method for establishing a new broadcast control channel carrier frequency within a cell without disturbing ongoing call traffic is disclosed. A cell having a base station transmitting broadcast control channel data over an existing BCCH carrier frequency establishes a second BCCH carrier frequency within the cell. During a first time period BCCH data is transmitted on the existing first BCCH carrier frequency. During a second time period, both the existing and new BCCH carrier frequencies carry BCCH data to enable surrounding mobile stations to detect and recognize both carriers. The transmission of the old BCCH carrier frequency is then discontinued during a third time period, such that the broadcast control channel data is only transmitted on the new BCCH carrier frequency.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: February 29, 2000
    Assignee: Telefonaktiebolaget L/M Ericsson (publ)
    Inventors: Carl Patrik Cerwall, Stig Roland Bodin