ogn itive ▁Radio ▁Work ▁Group , ▁which ▁worked ▁to ▁support ▁IE EE ▁P 1 9 0 0 . 1 ▁in ▁defining ▁standard ▁definitions ▁for ▁Software ▁Def ined ▁and ▁C ogn itive ▁Radio ▁and ▁to ▁establish ▁a ▁reference ▁architecture ▁for ▁a ▁cogn itive ▁radio ▁system . ▁ ▁Between ▁ 2 0 0 4 ▁and ▁ 2 0 1 0 ▁the ▁forum ▁signed ▁memor and ums ▁of ▁understanding ▁with ▁multiple ▁international ▁groups ▁to ▁allow ▁collaboration ▁in ▁areas ▁of ▁mut ual ▁interest . ▁These ▁groups ▁included ▁the ▁European ▁End ▁to ▁End ▁E ffic iency ▁Program , ▁IE ICE ▁in ▁Japan , ▁IE E K ▁in ▁Korea , ▁IE EE ▁Stand ards ▁Association , ▁J TR S ▁and ▁the ▁European ▁Science ▁Foundation . ▁In ▁ 2 0 0 7 , ▁the ▁forum ▁initi ated ▁the ▁Sm art ▁Radio ▁Challenge , ▁a ▁world wide ▁competition ▁in ▁which ▁student ▁engineering ▁teams ▁design , ▁develop ▁and ▁test ▁techn ologies ▁that ▁address ▁relevant ▁problems ▁in ▁the ▁advanced ▁wireless ▁market . ▁ ▁In ▁late ▁ 2 0 0 9 ▁the ▁Software ▁Def ined ▁Radio ▁Forum ▁was ▁renamed ▁the ▁W ire less ▁In nov ation ▁Forum , ▁reflect ing ▁the ▁fact ▁that ▁many ▁of ▁the ▁projects ▁undert aken ▁by ▁its ▁members ▁had ▁expanded ▁to ▁include ▁C ogn itive ▁Radio , ▁Systems ▁of ▁Systems , ▁Ad ▁H oc ▁Network s , ▁and ▁Dynamic ▁Spect rum ▁Access ▁Techn ologies . ▁The ▁forum ▁secured ▁representation ▁in ▁China ▁in ▁ 2 0 0 8 ▁and ▁opened ▁an ▁office ▁in ▁Br uss els ▁in ▁ 2 0 1