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Mobile communication system using various multiple access methods

  • US 5,805,581 A
  • Filed: 09/08/1995
  • Issued: 09/08/1998
  • Est. Priority Date: 09/09/1994
  • Status: Expired due to Term
First Claim
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1. A mobile communication system which includes a plurality of mobile and/or portable radio stations, and radio base stations for performing wireless communication between said mobile stations and said base stations using a predetermined method selected from a number of multiple access methods, wherein each of said mobile and/or portable radio stations and radio base stations comprises:

  • (a) TDMA communication means for assigning TDMA signals to time slots, which are contained in a frame, to perform communication based on TDMA method;

    (b) time-divided CDMA communication means having at least one spread-spectrum code generator and adapted for communication of time-divided CDMA signals based on a time-divided CDMA method;

    (c) said time-divided CDMA communication means being adapted for assigning time-divided spread-spectrum codes, which are generated by said spread-spectrum code generator, to said time slots of said TDMA communication method, whereby communication is carried out in such a manner that both TDMA signals and CDMA signals exist in said time slots; and

    (d) control means for selecting one of said TDMA method and said time-divided CDMA method for carrying out communication.

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