FEDERAL COMMUNICATIONS COMMISSION Mignon L. Clyburn Acting Chairwoman The Honorable John D. Dingell U.S. House of Representatives 2328 Rayburn House Office Building Washington, D.C. 20515 Dear Congressman Dingell: September 26, 2013 Thank you for your letter expressing concern about the Commission's Notice of Proposed Rulemakingto revise Part 15 of the Commission's rules to permit Unlicensed National Information Infrastructure (U-NII) devices in the 5 GHz band. Your views are very important and will be included in the record of the proceeding and considered as part of the Commission's review. As you are aware, the Commission currently licenses Dedicated Short Range Communications (DSRC) systems operating in the Intelligent Transportation System (ITS) radio service in the 5.85-5.925 GHz band. Under Commission rules, licensed users generally are protected from harmful interference by other users of a band. In this case, users of Part 15 devices must not cause harmful interference to the licensed services in the 5 GHz band. We understand that an extensive amount of research and investment has gone into developing the DSRC, and in evaluating the 5 GHz band for viable sharing scenarios. Before making any determination regarding the rules in this band, the Commission intends to thoroughly review NTIA's current and future interference analyses between DSRC systems and U-NII devices, as well as all other submissions. The staff is reviewing the extensive record that has been compiled in order to determine how best to address the technical and other issues raised in this proceeding. The sooner we solve these issues, the sooner American innovation can show leadership in developing this band for unlicensed services. I appreciate your interest in this matter. Please let me know if I can be of any further assistance. Sincerely, Yn..,--x.~ Mignon L. Clyburn 445 12" Street S.W. Washington, D.C. 20554 (202) 418-1000