Patent ID: 7620394
Filing Date: 2009-11-17
Classification: H04B,H04W

Abstract:
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; a second wireless communications system configured to provide wireless communications using at least a portion of the first frequency band; an inter-system communications link between the first wireless communications system and the second wireless communications system configured to coordinate the use of the first frequency band; and an interference reducer configured to receive information over the inter-system communications link regarding communications by the first wireless communications system and/or the second wireless communications system and to reduce interference between the first wireless communications system and the second wireless communications system using the received information, wherein the information comprises a communications signal transmitted by the first wireless communications system and/or the second wireless communications system; wherein the first wireless communications system is a Dedicated Short Range Communications (DSRC) system that is configured to provide information to/from transportation vehicles and uses 75 MHz of spectrum that has been authorized for intelligent transportation systems uses in the frequency band from 5.850 to 5.925 GHz; 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 substantially unused by the DSRC system at a distance from the roads/highways; wherein the second wireless communications system comprises at least one base station that is configured to use at least some frequencies that are also used by the DSRC system; wherein the at least one base station is configured to use the at least some frequencies over areas that are overlapping with the roads/highways; and wherein an element of the at least one base station is configured to provide a communications priority to the one or more road-side access points in using at least one DSRC system frequency.