High-Frequency Spectrum NPRM Should Wait Until WRC-2015, EchoStar Says

Wait until after November's World Radiocommunication Conference 2015 before taking action such as an NPRM on high-frequency spectrum, EchoStar said in a filing posted Tuesday in FCC docket 14-177. Some topics may be recommended for more study and there may be spectrum allocation decisions at WRC-15, so waiting until afterward to tackle high-frequency spectrum issues would let everyone, including the FCC, "take into consideration those WRC-15 determinations," the company said, citing a litany of unanswered questions about high-frequency spectrum issues it said need to be hashed out before an NPRM, including whether frequencies higher than 95 GHz should be included because antenna arrays in higher frequencies, such as 120-240 GHz, are more cost-effective than those at the 30-60 GHz range. EchoStar said other questions need answers, such as what kind of interoperability potential exists across different 5G bands as 5G could end up including bands above 95 GHz, and what kind of frequency ranges are best suited for end-to-end latency of less than a millisecond in 5G. Lacking technical data on incumbent operations, technical sharing rules such as what Intel has proposed "would essentially be meaningless," EchoStar said. Intel has pushed for the FCC to move quickly on a high-frequency spectrum NPRM, arguing it would encourage ITU discussions on the topic at WRC 2019 (see 1508110053). Even sharing criteria would first need numerous questions answered, such as the typical transmit power levels and antenna patterns for Ka-band earth stations, and how would 5G affect satellite earth stations, EchoStar said. There's also a dearth of data on potential cumulative 5G interference due to incumbent systems, and a lack of propagation models for 5G systems above 24 GHz, it said, leaving questions about what models the FCC would use, as well as how the agency would even propose technical and deployment parameters for 5G given that 3GPP and other standards groups are developing the technical transmit and receive parameters and will not be done until perhaps by 2020, the company said.