Patents by Inventor Christopher H. Kingdon

Christopher H. Kingdon 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: 6735222
    Abstract: A system and method in a digital TDMA telecommunication system for evaluating time slot offsets of asynchronously operating transmitters. The transmitters are equipped to receive a common reference clock signal, whereupon the value of the reference clock signal is recorded at transmission of specific time slots. The transmitters then perform a modulo operation on the recorded time and reports the result to a controlling node. Results of the modulo operation may then be compared with similar results reported by other transmission sources to the controlling node to determine relative time slot offsets between the transmission sources.
    Type: Grant
    Filed: August 14, 1998
    Date of Patent: May 11, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Christopher H. Kingdon, Anders T. Holmring
  • Patent number: 6411811
    Abstract: A telecommunications system and method is disclosed for provisioning assistance Global Position System (GPS) data to a GPS receiver within a mobile terminal. This can be accomplished by having multiple reference GPS receivers located throughout a cellular network, each reference GPS receiver being capable of providing locally valid lists of visible satellites and the associated ephemeris and clock correction information. The location of the Base Transceiver Station (BTS) within the cell that the mobile terminal with a built-in or attached GPS receiver is currently located in can be used as the local position estimate for that mobile terminal. From this local position estimate, the nearest reference GPS receiver can be ascertained and the relevant assistance data can then be sent to the GPS receiver within the mobile terminal through the cellular network to enable the built-in GPS receiver to calculate its position relatively quickly.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: June 25, 2002
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Jan Lennert Kransmo
  • Publication number: 20010014604
    Abstract: A telecommunications system and method is disclosed for provisioning assistance Global Position System (GPS) data to a GPS receiver within a mobile terminal. This can be accomplished by having multiple reference GPS receivers located throughout a cellular network, each reference GPS receiver being capable of providing locally valid lists of visible satellites and the associated ephemeris and clock correction information. The location of the Base Transceiver Station (BTS) within the cell that the mobile terminal with a built-in or attached GPS receiver is currently located in can be used as the local position estimate for that mobile terminal. From this local position estimate, the nearest reference GPS receiver can be ascertained and the relevant assistance data can then be sent to the GPS receiver within the mobile terminal through the cellular network to enable the built-in GPS receiver to calculate its position relatively quickly.
    Type: Application
    Filed: April 20, 1998
    Publication date: August 16, 2001
    Inventors: CHRISTOPHER H. KINGDON, BAGHER R. ZADEH, JAN LENNART KRANSMO
  • Patent number: 6185428
    Abstract: A system and method that makes more efficient utilization of BTS resources when BTSs are employed in time of arrival (TOA) measurements as is common in mobile positioning operations. A maximum signaling delay is assumed for which BTS resource assignment is delayed by a default time span in the event of an impending TOA measurement thereby allowing the BTS availment of the resources which would otherwise be idle yet assigned and therefore unavailable for other BTS functions during the period of signaling delay. The period of resource assignment delay may be increased or decreased, the actual adaption of the delay dependent on the true signaling delay.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: February 6, 2001
    Assignee: Ericsson Inc
    Inventors: Christopher H. Kingdon, Andres Thomas Holmring, Bagher Rouhollah Zadeh
  • Patent number: 6138003
    Abstract: A telecommunications system and method is disclosed which performs authorization checks prior to allowing a location service to position a mobile terminal within a cellular network. The various checks involve ensuring that the requesting agency has authorization to request positioning of mobile terminals, determining whether positioning of mobile terminals is allowed within the cellular network that the mobile terminal is currently located in, verifying the authenticity of the identity of the mobile positioning center, ascertaining whether the mobile subscriber has allowed the requesting agency to position the mobile terminal, and confirming that all relevant criteria for positioning have been met by both the mobile subscriber and the requesting agency.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: October 24, 2000
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Maya Roel-Ng, Stephen Hayes
  • Patent number: 6088594
    Abstract: A telecommunications system and method is disclosed which utilizes a terminal-based browser, such as the Wireless Application Protocol (WAP) "deck", within a Mobile Station (MS) to connect the MS to web-based location services and to a Mobile Positioning Center (MPC). Terminal based browsers, such as WAP "deck", allow for the graphical presentation of the current location of the MS on a display on the MS and provide an interactive user dialog, which permits the mobile subscriber to determine the format of the graphical presentation of the current location of the MS.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: July 11, 2000
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Maya Roel-Ng, Stephen Hayes
  • Patent number: 6078818
    Abstract: A telecommunications system and method is disclosed for allowing an application requesting positioning of a mobile terminal to indicate the quality of positioning information desired, e.g., timeliness, accuracy, etc. In addition, prior to performing the positioning, the cellular network can determine whether the quality of service requested can be achieved, and if so, return the positioning information along with a message indicating that the quality of service requested was achieved. However, if the quality of service requested cannot be achieved, a failure message is sent to the requesting application and the positioning is not performed.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: June 20, 2000
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Maya Roel-Ng, Stephen Hayes
  • Patent number: 6047183
    Abstract: A telecommunications system and method for determining optimal target Base Transceiver Stations (BTSs) to perform positioning handovers and obtain positioning data is disclose. When a positioning request is received by a Base Station Controller (BSC) serving the Mobile Station (MS) to be positioned, the serving BSC accesses a database within the BSC, which contains a list of cells belonging to candidate target BTSs. Based on this information, and the main antenna direction of the serving BTS, two candidates for positioning handovers are selected from the list such that the angle between the main direction of two adjacent BTSs is nearly equivalent to the angle between the main direction of two additional adjacent BTSs. By selecting the target BTSs in this manner, it can be ensured that the target BTSs surround the MS, thus decreasing the error in the location calculations performed by a Positioning Center (PC).
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: April 4, 2000
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh
  • Patent number: 6029070
    Abstract: A method, apparatus, and system for the selection of target nodes in locating a receiver is disclosed. The receiver measures the strength of signals transmitted by a number of nodes. The received strength is subtracted from the transmitting power of the nodes to determine the respective path losses. The node with the lowest path loss is selected as the target node. The target node is then used to perform a triangulation for determining the location of the receiver.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: February 22, 2000
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Gunnar Borg
  • Patent number: 6002932
    Abstract: A telecommunications system and method is disclosed for determining the address of both the home and serving Mobile Positioning Centers (MPCs). Each Mobile Switching Center/Visitor Location Register (MSC/VLR) and Home Location Register (HLR) within a Public Land Mobile Network (PLMN) will be provided with the MPC address that is valid for its PLMN. When a Mobile Station (MS) roams into a new (serving) PLMN, a Location Update is performed by the serving MSC/VLR to the Home Location Register (HLR). The MPC address for the serving MSC/VLR will be included in every location update operation to the HLR, which can then store this serving MPC address in the subscriber's HLR record. Furthermore, the home MPC address, valid for the PLMN of the HLR, is included in every subscriber data transfer operation from the HLR to the serving MSC/VLR, which can then store this home MPC address, in the subscriber's VLR record.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: December 14, 1999
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Maya Roel-Ng, Stephen Hayes
  • Patent number: 5991620
    Abstract: A telecommunications system and method is disclosed which avoids unwanted feature interactions while positioning a mobile station that was in idle mode when the positioning request was received by the network. When the serving MSC/VLR receives a request to collect positioning measurements for a mobile station that is in idle mode, the serving MSC/VLR will set an indicator associated with the subscriber to "busy for connection management due to positioning". This flag will allow the MSC/VLR to make a distinction between a positioning connection and the normal mark of "busy for connection management". Thereafter, when a mobile terminating call arrives to the MSC/VLR for a subscriber that is marked as "busy for connection management due to positioning", the MSC/VLR can place the incoming call in a queue until the positioning measurements are taken and the subscriber being positioned is put back in idle mode.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: November 23, 1999
    Assignee: Ericsson Inc.
    Inventors: Christopher H. Kingdon, Bagher R. Zadeh, Maya Roel-Ng, Stephen Hayes