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Digital mobile communications system and method for providing intensity/coverage reference maps using base stations and mobile stations

  • US 5,423,067 A
  • Filed: 09/04/1992
  • Issued: 06/06/1995
  • Est. Priority Date: 09/09/1991
  • Status: Expired due to Fees
First Claim
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1. A method of controlling a digital mobile communications system which maintains synchronization among data of base stations being sent, measures the time delay of radio waves transmitted from mobile stations under control at the control base station, instructs the value of said time delay to each of said mobile stations to adjust the timing of data of said mobile stations being sent to establish synchronization of communications between said base station and said mobile stations, measures at said mobile station relative time delays of radio waves transmitted from at least one base station other than said control base station with respect to the radio waves transmitted from said control base station, periodically reports the information on said relative time delays to said control base station from said mobile station, periodically calculates at said control base station the distances between said mobile station and each of said base stations based on said information on said time delay and relative time delays, and periodically determines at said control base station the current geographic position of said mobile station based on said calculated distances between said mobile station and each of at least three of said base stations by referring to geographic positional data of said base stations, said method comprising the steps of:

  • periodically measuring at said mobile station the electric field intensity of the radio waves transmitted from each of said base stations including said control base station during the same period as measuring said relative time delays,reporting from said mobile station to said control base station information on said field intensity together with information on said relative time delays, anddepicting at an operation and maintenance center an electric field intensity distribution map for radio waves by plotting said electric field intensity of the same radio waves reported through said base stations from a plurality of said mobile stations at said current geographic positions of said mobile stations.

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