Freescale is developing support for EN13757-4:2005 with the MC12311 rf, for further details see:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=TWR-12311-KIT&fsrch=1&sr=4
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC12311&fsrch=1&sr=2