Realizing Dynamic Spectrum Sharing Through Spectrum Access...

Kamran Etemad Ph.D.

Senior Technical Advisor, WTB/MD

Federal Communications Commission (FCC)

Kamran Etemad, FCC 1

Realizing Dynamic Spectrum Sharing Through Spectrum Access System

Note: The views expressed in this presentation are those of the author and may not necessarily represent the views of the Federal Communications Commission

5G World, London UK. June 2016

Outline

• Motivations, Opportunities and Technology Enablers

• Spectrum Sharing Framework in 3.5GHz, – SAS/Architecture and Key Concepts

– Multi Tier Access

– Granular and Coordinated spectrum Management

• Current Status

• Concluding Remarks


Shared Spectrum A new Opportunity


Flexible Use Area-Licensed Spectrum

Unlicensed SpectrumAccess

Site-Based Frequency Coordination

In Shared Spectrum

Uncoordinated Shared Access with many unlicensed access technologies today and in the future!

(Centrally) Coordinated Shared Access with “Limited” numbers of registered Users with “Known” technologies.

Exclusive use, Mostly Saturated Many Regional Band Classes Each with Limited SpectrumPropagation Suited for Macrocells

The SAS framework in 3.5GHz is special case of Site Based Frequency Coordination that is automated and granular.

There is a large amount spectrum (unlicensed or shared) at/below 5GHz which can be leveraged while and before moving to higher frequencies. Spectrum Sharing may also be considered in higher frequencies.

Spectrum Sharing Design Considerations

Spectrum CharacteristicsFrequency, Bandwidth

(Lic. Blocks, Carrier BW, Paired/Unpaired)

Incumbent Use

(e.g. Mission Critical, RX Only, Fixed/PtP)

Latest Advanced Technology Solutions

(4G, WiFi, 5G,…)

Target Use Cases

(Small Cells, IoT, back/Fronthaul, Others)


Sharing Feasibility and Framework

Advanced Technology Enablers

• Advanced Air Interface Design

– Radio Resource Management/Control (RRM/RRC)

– Transmit Power Control

– Adaptive time, frequency and Spatial Multiplexing

– Inter-Cell Interference Coordination

• Self Organizing Network (SON) Functions

– Signal/QoS level Reporting

– MDT

– Energy Saving Functions

• Carrier Aggregation

• Enhanced Positioning

• Carrier Sensing/Listen Before Talk

• Dynamic Frequency Selection

• Enhanced Cognitive Radios & SDR


Use Cases & Deployment Models

• Many use cases which can benefit from spectrum sharing:– HetNets with Small Cells

– Cloud/Centralize/Virtual RAN with Remote Radio Heads

– Wireless Backhaul to Small Cells

– Wireless Fronthaul in CRAN

– Fixed Wireless Access including smart grid, Utility related networks

– Supplementary Carriers

– Shared RAN

– Sidelink and Broadcast Communications


SAS


Three Tiers of Access

• Incumbent Access (IA) users: the first tier users include existing federal and non-federal users of the band.

• Priority Access Licensee (PALs): The second tier would consist of commercial users that would receive short-term priority authorizations to operate on certain portion of the band within designated geographic areas.

• General Authorized Access (GAA) users would be entitled to use the spectrum on an opportunistic basis if not used/assigned by higher tiers.

Incumbent Access (IA)

Priority Access(PAL)

General Authorized Access(GAA)


Each Tier accepts interference from Tiers above and is protected from tiers below.

Same Network and Devices

Band-wide Operability

• Operability Across the 150MHz Band

• Common Radio/Device Requirements for PALs and GAAs

• An operator – Can start as GAA and apply for PAL later

– Can start as PAL, e.g. for few years, and continue operation as GAA

– Can have mix of PAL and GAA carriers

– Can continue operation in a different carrier if its initial carrier is not available due to incumbent use.


PALF1

GAAF3

PALF2

Granular Spectrum Management

• Efficient use is enabled thru opportunistic use of spectrum that is not used by higher tiers and a granular licensing units

• Granular License Management

– License Bandwidth: 10MHz Channel Units ( Can be aggregated up to 40MHz)

– License Area: 1 Census Tract Units (Can be aggregated)

– License Term: 3 Year (non-renewable)


PAL1 PAL1

PAL1 PAL1 PAL2

GAA1/2

F1

F2

F3

R1 R2 R3 R4

IA 1 IA 1

IA 2

IA 2

F1

F2

F3

R1 R2 R3 R4

Functional Framework


PAL/GAA

PAL/GAA

PAL/GAA

CBSD 1

CBSD 2

CBSD 3

CBSD 4

User Device

Proxy/Network Manager

ESC(Federal

Incumbent Use)

SAS1

SAS2

FCC Databases(Commercial

Users/Licenses)

User Device

User Device

Spectrum Availability (Subbands/Time/Locations)and Interference Measurements

Capabilities and Configurations? Operational/Configuration Limits Interference Reports? Remedies/Updated Limits

PAL, GAA & FSSRegistration/Licensing Information

CBSD Interactions with SAS

• CBSDs to SAS– Register with SAS with Required and Optional Information Obtain and Follow Operational

Parameters/Settings from SAS

– Reports any Configuration/Location Changes or Interference Issues to SAS

– May Report Sensing Information, if Supported, to the SAS

• SAS to CBSDs– Registers and Authorize CBSDs for Operation in the band

– Determines Available Channels at each geolocation

– Calculates Aggregate signal/interference from CBSDs operating in the band and make necessary actions/reactions to protect Incumbents/PALs from Interference from other user


GAA/PAL

GAA/PAL

CBSD 1

CBSD 2

CBSD 3

Proxy/Network Manager SAS

CBSD 4

CBSD Geographic location,Antenna heightCBSD class (Category A/Category B), Requested Access (PAL/GAA) FCC identification numberUser contact information, Air interface technology, ….

Incumbent Protection Analysis

Max AcceptableIoT at Radar Site

Aggregate projected interference from all lower tier users in the same frequency should be less that max tolerable interference

of incumbent user

Exclusion/Protections Zone

Offline & A Priory Estimation of Exclusion Zones based on an assumed/projected deployments

SAS Online Evaluation of Protection Zonesbased on actual CBSD deployment.


Source: 3.5 GHz Study Report

Dynamic Protection Zones


Protection Zone is enforced by SAS when and where Incumbent Use is

Detected by ESCWhen and Where

Incumbent is not using the band commercial use is

allowed.

ESC

Key Updates

• 2nd R&O and Order on Recon addressed a number of comments and new issues such as:

– Defining “Use” of PAL frequencies,

• Enabling Use or Share within and across PALs,

• PAL Protection based on actual use and deployment

• Opportunistic GAA in unused spectrum

– Implementing secondary markets in Priority Access Licenses

• Leasing PALs or Partial PALs

• New business/revenue models enabling even more usage driven and granular utilization of the band

– Protections for FSS: Technical criteria used to define protection zones for FSS to be used and enforced by SAS

– Included some adjustment to power levels and response times

• Ongoing work

– Multi-Stakeholder Process and Standardization

• Industry collaboration and standardization is ongoing and is key to successful and scalable implementation

• Ongoing Efforts in Winn Forum and new initiatives in 3GPP

– FCC has started SAS/ESC Application review in Process followed by Testing and Certification


Concluding Remarks

• Dynamic Spectrum Sharing is key technology in the evolution of Wireless Networks.

• The technology and policy enablers are available today some early realization is upcoming for 3.5GHz in US.

• New spectrum sharing tools may improve sharing within future 5G bands

• New (SAS type) multi-tier coordinated spectrum sharing creates new deployment and revenue models and allows sharing among commercial and with federal users


Contact: [email protected]


Realizing Dynamic Spectrum Sharing Through Spectrum Access...

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