EWA, PDV Executives Address 900 MHz Proposal’s Interference Concerns
Monday, March 30, 2015 | Comments

Representatives from the Enterprise Wireless Alliance (EWA) and Pacific DataVision (PDV) continue to make their case at the FCC, meeting on March 23 with officials from the Wireless Telecommunications Bureau and the Office of Engineering and Technology to discuss interference concerns with their 900 MHz band plan.

The presentation, titled “900 MHz Private Enterprise Broadband (PEBB): Protecting Adjacent Narrowband Operations While Delivering Spectrum Efficient Technology,” included further details on the proposed band plan and interference resolution efforts.

In November, PDV and EWA filed a petition asking the FCC to reconfigure the 10 megahertz of the 896 – 901 MHz paired with 935 – 940 MHz to allow a 3-megahertz contiguous block for PEBB. The remaining 2 megahertz of spectrum could be used for narrowband push-to-talk (PTT) services by the band’s many critical infrastructure industry (CII) users, the proposal said.

The FCC requested comment on the plan and most 900 MHz incumbent licensee comments opposed the PDV and EWA petition citing interference concerns, among others.

The presentation outlined the adjacent operations to PEBB below 937 MHz as high-site, high-power facilities with systems configured to provide primarily mobile communications in a noise-limited environment with equipment designed with interference-rejection capability. Narrowband FlexNet data systems operate above 940 MHz and include fixed data operations with a mix of high and low-site base stations communicating with large numbers of fixed low-power remote end points. Base terminal stations are designed with sensitive receivers to take advantage of the low noise floor. The proposal said what protects FlexNet will protect LMR systems.

The presentation noted the PEBB out-of-band emission challenges from adjacent narrowband technologies, including AMI’s metering systems, railroads’ advanced train control systems and private enterprise and SMR LMR networks. EWA and PDV said they have aggressive attenuation with the assigned Long Term Evolution (LTE) internal channel guard band and filter technology to meet attenuation requirements with “reasonable cost and implementable filter solutions.”

Proposed technical specifications for emissions are for any uplink frequency outside 898 – 901 MHz, emissions shall be attenuated below the transmitting power by a factor of at least 55 + 10 log decibels (dB) in a 30-kilohertz segment. For any downlink frequency outside 937 – 940 MHz, emissions shall be attenuated below the transmitting power by a factor of at least 73 + 10 log dB in a 30-kilohertz segment.

One slide discussed an advanced filter technology for eNodeBs with proposed specifications exceeding the most stringent FCC emission rules. “Supplier filter solution simulations prove feasibility,” the slide said. A product design specification is complete with production filters available by the first quarter of 2016. For devices, the specifications match FCC band class 26 rules, and filter solutions would meet band class 26 rules commercially available. The presentation also outlined a filter resolution for Sensus use case concerns.

In addition, the presentation addressed comparable facilities for narrowband incumbents that would be realigned. The Universal Licensing System (ULS) finds 32 900 MHz sites with fewer than 20 channels, one slide said. Current products permit spacing as close as 100 kilohertz with insertion loss of -4.2 dB. If combiners don’t achieve comparable coverage, other methods can be employed, the presentation said.

EWA President and CEO Mark Crosby and PDV Vice Chairman Morgan O’Brien met with the FCC officials, in addition to two technical advisers, Robert Burkhardt of Gnosis and Arif Ansari of Sublime Wireless.

The full presentation is available here.

Your comments are welcome, click here.


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