2016年测量和传感5GHz小组委员会建议

Subcommittee RecommendationsCSMAC MeetingJune 8, 2016 SAS/Spectrum Database International Extension Members: Co-chairs: •Paul Kolodzy•Dennis Roberson •Mike Chartier•Mark Gibson•Dale Hatfield•Mark McHenry•Janice Obuchowski•Rick Reaser•Kurt Schaubach•Steve Sharkey•Mariam Sorond NTIA Liaison:•Ed Drocella Work Plan Study Question: What are the strengths and weaknesses of measurement-based andsensor-based spectrum sharing methods, and how can theweaknesses be overcome? How can this spectrum sensing andspectrum monitoring data be analyzed to identify and addressenvironmental trends pointing towards potential interferencesituations before harmful interference occurs? Specific bands ofinterest are U-NII-2B (5350-5470 MHz) and U-NII-4 (5850-5925MHz). Approach Three topic areas: •Strengths/Weaknesses of Measurement Architectures•Characterization of the systems and the measurements to be made•Policy implications and work-arounds for measurement weaknessesfrom the regulator’s perspective Measurement tasks to be addressed: •Prior to sharing (opportunity evaluation)•Measurements to enable sharing (operational support),•Measurements after sharing is allowed (trending) Recommendations (1) •Recommendation 1 – Measurement Techniques:It is recommended that NTIA usedifferent measurement techniques in different bands in order to determinethe viabilityof spectrum sharingfor the U-NII-2B (5350-5470 MHz) and U-NII-4 (5850-5925 MHz)bands.The lower band can employ high gain antennas over long periods of time withclear line of sight to airport and space assets in order to determine spectral use. Theupper band will be more challenging due to the distributed transmission characteristicsand will require either distributed spatial measurements or employing some form ofsignal augmentation techniques. •Recommendation 2 – Trend Information and Databases:It is recommended that NTIAuse different measurement techniques in order toenable spectrum sharingfor the U-NII-2B (5350-5470 MHz) and U-NII-4 (5850-5925 MHz) bands. It is understood thatthese measurement technologies will need to be capable of providing trendinginformation for each of the two bands. The lower band, U-NII-2B can use databasetechniques for protecting the satellite system, dynamically updated databasetechniques or sparsely distributed fixed elevated sites for production of airbornetelemetry systems. The upper band, U-NII-4, should consider employing signalaugmentation / beaconing or a geo-registered database for protection of the potentiallydeployed DSRC systems. Due to the limited interoperability analysis that has been donebetween the DSRC systems and possible sharing waveforms, it is difficult to determinethe sensitivity of the measurement systems that are needed to insure protection of theDSRC systems. Recommendations (2) •Recommendation 3 – Measurement Systems Requirements:It isrecommended that NTIA create a report that defines the measurement systemrequirements and architectures needed to successfully measure signals fordifferent applications (prior to sharing, during sharing, and trends analysis postsharing). The focus should be to develop technical criteria (sensor to emitterdistances, spectrum scanning revisit rate, detector sensitivity, etc.) so that themeasurements have a high detection probability. This report should alsodescribe potential measurement pitfalls and validation tests that should beapplied. The goal is to insure that the lack of detecting a signal infers that thesignal is not present (within the sensor to emitter distances) and not that themeasurement approach is defective. •Recommendation 4 – Measurement Architecture Spreadsheet:It isrecommended that NTIA complete the investigation of different measurementarchitectures and their utility for various spectrum sharing functions (sharingpotential, operationally employed during sharing, post sharing trendinganalysis and potentially enforcement) and federal services. This should includethe remaining 5 GHz bands and their services not specifically addressed by thissubcommittee and other federal services utilizing spectrum under 7 GHz. Recommendations (3) •Recommendation 5 – Detection Augmentation Techniques: a)It isrecommended that NTIA further investigate techniques that can be employedfor federal spectrum users to augment the detectability of their users and theimpacts of spectrum sharing on their users. Examples of such technologieswould include beaconing or identification of the specific waveforms that arebeing used. (b)It is further recommended that NTIA reach out to the FCC toinvestigate techniques to augment the detectability and mitigation oftransmissions from users and services that share federal spectrum. Thesecritical investigations will need to address both security and privacy issues. •Recommendation 6 – Coordinated Sensing:It is recommended that the NTIAinvestigate the use of coordinated sensing periods in network spectrumsharing systems. The NTIA should conduct simulatio