82. Increased Federal access to 2025-2110 MHz and 5150-5250 MHz bands. As noted above, NTIA indicates that in certain Federal relocation scenarios, DoD and other Federal incumbents in the 1755-1850 MHz band would need access to other bands specifically, that certain aeronautical systems could relocate to the 2025-2110 MHz and 5150-5250 MHz bands. NTIA subsequently transmitted a more recent proposal from DoD that implicates the 2025-2110 MHz band but not the 5150-5250 MHz band. We seek comment on these and any alternative relocation concepts, including the viability of repacking incumbents into the 1780-1850 MHz band, recognizing that most commenters will not have access to information about Federal system characteristics or mission requirements. Nonetheless, we seek comment on the potential benefits and costs of implementing such a relocation, particularly with respect to existing and potential future uses of those bands. In paragraph 176 below we seek comment on any changes to the Table of Frequency Allocations that would be necessary.
83. Our rules for the AWS-3 bands must take account of the potential for permissible operations to cause harmful interference to operations in other service areas, blocks or bands. In the proposed band plan, AWS-3 spectrum would be licensed in five-megahertz blocks using EA licenses. Interference must therefore be considered between adjacent AWS-3 blocks, e.g., between 2155-2160 MHz and 2160-2165 MHz, as well as between AWS-3 operations in the 2155-2180 MHz band and services in the adjacent AWS-1 and AWS-4 bands. Similarly, AWS-3 mobiles could interfere with proximate Federal or non-Federal operations in the same or nearby bands.
84. Two predominant types of adjacent channel interference can occur. The first is caused by out-of-band emissions (OOBE) that fall directly within the passband of an adjacent-band receiver. Such emissions cannot be "filtered out," and can only be mitigated by: (1) Providing sufficient physical separation between the transmitter and receiver; and/or (2) suppressing
85. We seek comment on possible technical and operational rules to protect these various services from harmful interference. Where possible, we propose to adopt for AWS-3 the same technical requirements as apply to AWS-1, where our experience indicates that the requirements have facilitated good service while minimizing undesirable interference, and to AWS-4. We are especially interested in whether specific AWS-3 spectrum considerations may warrant different requirements. We also ask commenters to address any specific technical rules that would be required for specific AWS-3 bands that they propose, other than the ones identified in this notice.
1. OOBE Limits
86. Section 27.53(h) of our rules requires that out-of-band emissions from transmissions in the AWS-1 bands be attenuated below the transmitter power (P) by a factor of not less than 43 + 10 log10 (P) dB outside of the licensee's frequency block. The same rule also specifies the measurement procedure required to determine compliance with this
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