Mobile transmitter/receiver

• US 4,907,290 A
• Filed: 05/13/1988
• Issued: 03/06/1990
• Est. Priority Date: 05/15/1987
• Status: Expired due to Term

• Current Assignee: Datatrak Limited Hargreaves Road Groundwell Industrial Estate Swindon Wilts SN2 5AZ England
• Original Assignee: Datatrak Incorporated
• Inventors: Crompton, Edward W.
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Kuntz, Curtis A.
• Application Number:
  US07/193,826
• Time in Patent Office: 662 Days
• Field of Search: 455/88, 455/89, 455/99, 455/53, 455/54, 455/56, 455/345, 455/67, 455/62, 455/68, 455/226, 455/185, 455/186, 342/456, 342/458, 342/463, 340/825.36, 340/989, 340/990, 340/993, 340/994
• US Class Current: 455/524
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A mobile transmitter/receiver is for use in a communication system comprising a plurality of fixed transmitters/receivers located at spaced apart positions in a terrestial area, each fixed transmitter/receiver operating on one or more of a plurality of radio frequency channels. The mobile transmitter/receiver comprises: a transmitting/receiving section for transmitting information to and receiving information from the fixed transmitters/receivers; a location determining section for receiving signals from the fixed transmitters/receivers for determining the location of the mobile transmitter/receiver within the communication system; data storage for storing information relating to radio communication paths from all locations in the area to the fixed transmitters/receivers; a selecting section for determining from the location of the mobile transmitter/receiver determined by the location determining section and the information stored in the data storage a selected one of said communication paths; and a conditioning section for conditioning the transmitting/receiving section in accordance with information stored in the data storage relating to the selected communication path.

Claims

1. A mobile transmitter/receiver for use in a communication system comprising a plurality of fixed transmitters/receivers located at spaced apart positions in a terrestial area, each fixed transmitter/receiver operating on one or more of a plurality of radio frequency channels, and locating means, the mobile transmitter/receiver comprising:

transmitting/receiving means for transmitting information to and receiving information from the fixed transmitters/receivers;

location determining means for receiving signals from the locating means for determining the location of the mobile transmitter/receiver within the communication system;

data storage means for storing information relating to radio communication paths from all locations in the area to the fixed transmitters/receivers;

selecting means for determining from the location of the mobile transmitter/receiver determined by the location determining means and the information stored in the data storage means, a selected one of said communication paths; and

conditioning means for providing the transmitting/receiving means with information stored in the data storage means relating to the selected communication path.

2. A mobile transmitter/receiver as claimed in claim 1 wherein said conditioning means further comprises means for providing the transmitting/receiving means with power and/or sensitivity information from the data storage means relating to the selected communication path.

3. A mobile transmitter/receiver as claimed in claim 1 or 2 including means for directing a radio beam from the transmitting/receiving means in accordance with information from the data storage means relating to the direction of the selected communication path.

4. A mobile transmitter/receiver as claimed in claim 1 or 2 in which the data storage means includes a lookup table.

5. A communication system comprising:

a plurality of fixed transmitters/receivers located at spaced apart positions in a terrestial area, each fixed transmitter/ receiver operating one or more of a plurality of radio frequency channels;

locating means; and

a plurality of mobile transmitters/receivers each comprising transmitting/receiving means for transmitting information to and receiving information from the fixed transmitters/receivers, location determining means for receiving signals from the locating means for determining the location of the mobile transmitter/receiver within the communication system, data storage means for storing information relating to radio communication paths from all locations in the area to the fixed transmitters/receivers, selecting means for determining from the location of the mobile transmitter/receiver determined by the location determining means and the information stored in the data storage means, a selected one or said communication paths, and conditioning means for providing the transmitting/receiving means with information stored in the data storage means relating to the selected communication path.