Introduction

This document provides technical background information on systems operating in the FS and the MSS in the 2.1 GHz frequency band (Section 2); delineates methods for evaluating the associated potential interference (Sections 3,4 and 5); presents example applications for the methodology (Section 6) and discusses possible interference mitigation techniques (Section 7). Effective January 1,2000, the frequency band 2165-2200 MHz will be allocated in the United States and Canada to both the FS and MSS (space-to-Earth).¹ However, in accordance with the ITU Radio Regulations (RR), the subject frequency sharing situations can also arise in the 2160-2165 MHz band. General background information on international and domestic coordination of proposed 2 GHz MSS systems (with terrestrial FS) is provided in the subsequent sub-sections.

¹ FCC, ET Docket No. 95-18 (FCC 2 GHz Order), released March 14,1997. Also see FCC, ET Docket No.95-18, Memorandum Opinion and Order & Third NPRM and Order, released November 25,1998.