5g小组委员会最终建议2017年11月

NOVEMBER 17TH, 2017 MEMBERSHIP1 Co-chairs: •Mariam Sorond (mariam.sorond@dish.com)•Mark Racek (mark.racek@ericsson.com) NTIA Liaison: •Rangam Subramanian (RSubramanian@ntia.doc.gov)•Amy Sanders (asanders@ntia.doc.gov)•Robert Denny (RDenny@ntia.doc.gov) Members: •Janice Obuchowski•Carl Povelites•Charla Rath•Dennis Roberson•Steve Sharkey•Chris Weasler •Paul Anuszkiewicz•Tom Dombrowsky•Dale Hatfield•Mark Lewellen•Allen MacKenzie•Donna Murphy STUDY QUESTIONS2 1.What technologies (including waveforms and architectures) might be included in5G standards to facilitate sharing between federal and non-federal systems? a.Among other things, please consider specifically the key receiver performancerequirements for sharing, particularly with respect to IoT devices, including a device'scapacity for resilience and interference detection and avoidance.b.Consider any 5G-specific technologies that might facilitate interference prevention,detection, and resolution.c.Identify the standardization challenges with respect to such technologies and whatactions NTIA should take to address these challenges. 2.What commercial 5G deployment scenarios (e.g., specific commercial use cases)exist that could potentially maximize the shared use of this spectrum (e.g.,dynamic shared access between federal and non-federal users)? RECOMMENDATION: INTERFERENCEMITIGATION TECHNOLOGIES TO FACILITATEFEDERAL / NON-FEDERAL SYSTEMS SHARING3 The responses to the questions in this document represent a general overview of potential technologies, methodologies, and techniques forinterference mitigation.Such mitigation technologies must be evaluated for suitability to facilitate spectrum sharing based on all relevantfactors, including specific frequency band under consideration, nature and use cases of the federal and non-federal systems, and whether theinterference to mitigate is a co-frequency or adjacent/near-adjacent frequency case. When considering compatibility, both receiver andtransmitter characteristics must be considered as well as the system design and performance requirements. For these reasons and others, aspecific recommendation on technologies to implement in federal systems is not possible. Keeping this is perspective, CSMAC 5G subcommittee has following recommendations for NTIA: 1.Open one or a series of Notice of Inquiries (and/or Requests for Information) designed to collect information on potential spectrumbands that could be considered for sharing including proposals for how these bands could be shared with the incumbents. Develop alist of information that is needed for interference mitigation that would improve sharing. This list should include information about thelegacy waveform and operation that is required to design and develop sharing approaches, and the information needed to co-exist. 2.Recommend that NTIA request that FCC consider a counterpart processes inquiry on which commercial bands and which technologysteps should be considered for bi-directional sharing.3.A review of the new technologies that are being developed in 3GPP that can address sharing between federal and nonfederal systems.For instance, 3GPP Release 14 incorporates means to reduce uplink interference at the receiver by utilizing MMSE-IRC (minimummean square error – interference rejection combining). RECOMMENDATION: INTERFERENCEMITIGATION TECHNOLOGIES TO FACILITATEFEDERAL / NON-FEDERAL SYSTEMS SHARING(CONTINUED)4 4.Beamforming, active antenna system (AAS), massive MIMO and network/cooperative MIMO can help reduce the effect of interferenceat the receiver and reduce interference in a shared environment.5.NTIA should evaluate the technologies outlined above based on spectrum, technology, application, and functional requirements of thefederal communication systems that needs to share spectrum with a non-federal entities.6.Expedite workshop on bi-directional sharing recommended in last round of CSMAC deliberations. (As proposed in WG Report datedJune 2016 and by CSMAC at August 2016 meeting.)7.Hold a workshop with the objective to establish a platform for an industry-led consensus on solutions to fundamental questions onsharing and interference mitigation.8.Currently, there are no regulations governing the design of wireless receivers, or their performance. Protection from noise andinterference is achieved through stringent requirements for the performance parameters like ACS (adjacent channel selectivity),blocking characteristics, spurious response, and intermodulation response. Propose NTIA examine receiver technology, in existing andfuture systems that could allow federal and non-federal systems to co-exist with minimal performance degradation in a spectrumsharing scenario. RECOMMENDATION: SPECTRUMMANAGEMENT UTILIZING AUTOMATEDCOORDINATION (DATABASE)5 1.Monitor the activities with regards to the SAS in the 3.5 GHz to determine how effective the regulatory framework allowsspectrum sharing while at the same time managing interference. 2.Invest