Nokia Says 6 GHz Fixed Operations Interference from Unlicensed Users Likely
Monday, April 22, 2019 | Comments

Nokia met with FCC officials to present a study on interference at 6 GHz and its view on the automated frequency coordination (AFC) system.

Nokia conducted a simulation study to evaluate the interference potential of proposed 6 GHz unlicensed operations to fixed links. A key conclusion of the study is that co-channel operations of unlicensed services proposed in this proceeding, including indoor operations, can cause harmful interference into fixed operations under certain circumstances.

Nokia said fixed service receiver selectivity was not considered in the simulations and warrants further study. Further investigation of receiver selectivity is recommended to determine if operation of fixed service and unlicensed service on immediately adjacent channels is feasible or whether a guard band would be needed between fixed service and unlicensed service spectrum blocks in some cases.

Nokia studied the coexistence between 6 GHz unlicensed national information infrastructure (U-NII) network and fixed station receivers, in outdoor and indoor simulations. The supplier said potential interference cases were found using the rules the FCC proposed in the notice of proposed rulemaking (NPRM).

Last year, the FCC proposed making up to 1,200 megahertz of spectrum available for use by unlicensed devices in the 6 GHz band (5.925 – 7.125 GHz), despite numerous mission-critical communications industry concerns and filings.

Nokia said the AFC should avoid co-channel deployment of U-NII and fixed links. A second presentation provided Nokia’s view on how an AFC system (AFC) could facilitate unlicensed operations while protecting fixed links. The AFC is a required feature to coordinate not only outdoor unlicensed operations but also indoor unlicensed operations, with incumbent fixed systems to adequately protect fixed systems. Effective operation of the AFC could be achieved using even modestly accurate indoor position information obtained using widely used techniques that rely on cellular base-station and Wi-Fi access point location databases.

Nokia outlined two flexible implementation options for AFC that support managed, as well as organic, deployment of unlicensed systems. The three Nokia documents are here.

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