FEDERAL COMMUNICATIONS COMMISSION 
WASHINGTON 
O FFICE OF 
TH E CHAIRMAN 
The Honorable David Vitter 
United States Senate 
516 Hart Senate Office Building 
Washington, D.C. 20510 
Dear Senator Vitter: 
February 2, 2016 
Thank you for your letter supporting Globalstar's petition seeking rule changes that 
would permit it to deploy terrestrial broadband services in the 2.4 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. 
Globalstar' s petition raises complex technical questions and the record in this proceeding 
demonstrates significant concerns on the part of other in-band and adjacent band spectrum users 
and licensees over potential interference from Globalstar's proposed deployment. These users 
and licensees include stakeholders with interests in WiFi, Bluetooth, Broadcast Auxiliary 
Service, Educational Broadband Service and Broadband Radio Service. Commenters in the 
proceeding have raised numerous issues, including the elimination of adequate spectral 
separation between Globalstar' s proposed terrestrial low power network and WiFi channel11 , 
overlap with Bluetooth operations, and interference protection to broadcast auxiliary and 
broadband radio services. 
The Commission has been carefully considering the Globalstar proposal and examining 
the still growing record in the proceeding. I and the Commission staff have encouraged the 
interested parties to work together and share information to resolve interference concerns, 
however, strong disagreements about the potential for detrimental impact on current licensed and 
unlicensed services persist. 
The Commission has worked diligently to better understand and resolve these issues and 
has been engaging closely with Globalstar. In March 2015, Globalstar and several interested 
parties participated in a demonstration of the proposed Globalstar system at the FCC' s 
Technology Experience Center. In September 2015, Globalstar reported the results of tests 
conducted over the summer which the Commission has reviewed. In December 2015, my 
wireless advisor, Commissioner Clyburn, and staff from Commissioner Rosenworcel ' s office 
visited The Washington School for Girls to see Globalstar's technology in use. Finally, earlier 
this month, my office, the Commission' s Office of Engineering and Technology, and 
International Bureau met with Globalstar to inquire into its proposed deployment plan and 
network operating system. 
Page 2- The Honorable David Vitter 
Commission staff continues to meet with Globalstar and potentially affected parties to 
understand and address potential interference and technical issues raised. I appreciate your 
interest in this matter. Please let me know if I can be of any further assistance.