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Reusing frequencies of a fixed and/or mobile communications system

  • US 8,023,939 B2
  • Filed: 09/28/2009
  • Issued: 09/20/2011
  • Est. Priority Date: 02/22/2005
  • Status: Active Grant
First Claim
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1. A communications system, comprising:

  • a first wireless communications system configured to provide wireless communications over short range wireless communications links using a first frequency band; and

    a second wireless communications system configured to provide wireless communications using at least a portion of the first frequency band;

    wherein the first wireless communications system is a Dedicated Short Range Communications (DSRC) system that is configured to provide information to/from transportation vehicles using a DSRC frequency band;

    wherein the DSRC system comprises one or more road-side access points configured to exchange information with transceivers that are installed in vehicles such that frequencies used by the DSRC system are used at or near roads/highways by the DSRC system and remain unused by the DSRC system remote from the roads/highways;

    wherein the second wireless communications system is not a DSRC system and is not configured to provide information to/from transportation vehicles; and

    wherein the second wireless communications system comprises at least one base station that is located remote from the roads/highways and that is configured to use at least one frequency of the DSRC frequency band that remains unused by the DSRC system remote from the roads/highways.

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