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Mobile satellite communication system

  • US 5,835,846 A
  • Filed: 12/12/1995
  • Issued: 11/10/1998
  • Est. Priority Date: 12/13/1994
  • Status: Expired due to Term
First Claim
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1. A mobile satellite communication system in which a base station is connected with a mobile station via a communication satellite,said mobile station comprising:

  • measuring means for obtaining an actual measuring time Tk and an average received signal level Qk (k=1, 2, . . . ) in a predetermined measuring period T; and

    transmission means for informing said base station of said actual measuring time Tk and said average received signal level Qk, andsaid base station comprising;

    means for extracting said actual measuring time Tk and said average received signal level Qk from a received signal sent from said mobile station;

    means for calculating a total measuring time tk which is a sum total of said actual measuring time Tk ;

    means for obtaining a measuring error Δ

    Dk of an average received signal level in said total measuring time tk ;

    storing means for storing a total measuring time tk-1, a corrected average received signal level Rk-1 and a transmission power control amount Δ

    Pk-1 at the end of a preceding measuring period of said mobile station;

    means for obtaining a corrected average received signal level Rk at the end of a present measuring period of said mobile station on the basis of said corrected average received signal level Rk-1, said transmission power control amount Δ

    Pk-1, said total measuring time tk-1 said average received signal level Qk, said actual measuring time Tk and said total measuring time tk ;

    means for calculating a transmission power control amount Δ

    Pk of said base station on the basis of said measuring error Δ

    Dk and a difference between said corrected average received signal level Rk and a predetermined reference value Rref of the received signal level of said mobile station; and

    means for obtaining present transmission power Pk from said transmission power control amount Δ

    Pk and preceding transmission power Pk-1, and for controlling the transmission power of said base station by said present transmission power Pk.

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