improving cell capacity of 5g systems through opportunistic use of unlicensed and shared spectrum
TRANSCRIPT
Kamran Etemad Ph.D.
Senior Technology Advisor
(FCC & UMCP)
LTE/5G World SummitAmsterdam, 2014
Improving Cell Capacity of 5G Systems Through Opportunistic Use of Unlicensed and Shared Spectrum
Outline
Opportunistic Spectrum Access and Cooperative Communications
Shared Access and Unlicensed Spectrum
Use of LTE(U/D) and/or WiFi(Direct)
Design Options and Use Cases
Concluding Remarks
2K. Etemad LTE/5G World Summit, Amsterdam 2014
Note: The opinions expressed in this presentation are those of the author and do not necessarily represent the views of the Federal Communications Commission or the United States Government.
Key Areas of Opportunity
3
Opportunistic Shared Spectrum
Access
Multi-RAT Cooperative
Communications
OptimalRadio Access/Routing
(Cost QoS)
N2D UnicastDirect D2D
Local Group Multicast D2(m)D
Broadcast
(W)WAN(W)LAN
PAN
Access to Large Amount of
Locally/Temporally Unused Spectrum
K. Etemad LTE/5G World Summit, Amsterdam 2014
Spectrum Angle
4
“Traditional” Licensed Spectrum
Unlicensed Spectrum
Access
Shared Spectrum Access
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. Sharing with federal and/or other commercial Users
Exclusive use, Mostly Saturated Many Regional Band Classes Each with Limited SpectrumPropagation Suited for Macrocells
K. Etemad LTE/5G World Summit, Amsterdam 2014
Realization of Dynamic Spectrum Sharing
The Spectrum Access System (SAS)
Takes dynamic inputs from incumbents and existing authorized users regarding their spectrum utilization.
Communicates with existing and potential users of 3.5 GHz Band about the availability of spectrum and certain operational parameters or their changes
Three Tiers of Access:
(1) Incumbent, (2) Priority Access License, (3) General Authorized Access
Authorized “User”AU (PAL or GAA)
Incumbent Users
Spectrum Availability (Subbands/Time/Locations)and Interference Measurements
Capabilities and Configurations? Operational/Configuration Limits Interference Reports? Remedies/Updated Limits
Registration/Licensing Information
Infrastructure Nodes (BS/APs)
End User Equipment
SAS
Spectrum Database
Spectrum Management
Security Gateway
(Federal SAS?)
Regulator (FCC)
5K. Etemad LTE/5G World Summit, Amsterdam 2014
Key Enabler: Generalized Carrier Aggregation
6
Inter-eNB, Mix of FDD-TDDNon-Ideal BackhaulSingle TechnologyTwo Schedulers (Dual Connectivity)
Inter-RATCC2: WiFi, LTE-U, LTE-D, Others?
Intra-eNB, FDD or TDDFiber Connected Macro to PicoCells/RRHsSingle TechnologySingle Scheduler
CC1CC2
R10-11 R12 R13?
Booster Cell/Radio:• PicoCell, • RRH (Same Cell ID), • Relay Node?• WiFi AP?• WiFi RRH?
Anchor Cell/RAT:• LTE 4G/5G Licensed• Wide Area Mobility• Control Plane
Signaling
K. Etemad LTE/5G World Summit, Amsterdam 2014
Multi-Radio Cooperative Communications
Distributed MAC,
Alternative 1: Loosely Coupled WiFi Offload
• ANDSF/UE based control,
Alternative 2: LTE-U with Distributed MAC, Standalone LTE-U, e.g. LTE-D for D2D
Centralized RRC/MAC/Supplementary Carrier
Alternative 1: LTE-U
Alternative 2: WiFi
• RAN Controlled WiFi Offload
• LTE-WiFi Aggregation
• LTE Controlled WiFi Direct
PHY
MAC
RLC
PCDP
RRC
PHY
MAC
Booster Connectivity Radio
(LTE-U/WiFi)
AnchorNetwork Access Radio
(LTE)
CNCN
How tight of a coupling/integration?
7K. Etemad LTE/5G World Summit, Amsterdam 2014
Use Cases
8
CN
HetNet/CRAN withPicoCell/RRH/Relay
Integrated Small Cells
WAN Assisted/Controlled D2(m)D
Licensed Spectrum TX’s with LTE+AS/NAS Control Signaling, Security/ Mobility Session Managements, etc.
Unlicensed/Shared Spectrum TX’sWiFi (Direct) or LTE-U/LTE-D
K. Etemad LTE/5G World Summit, Amsterdam 2014
WiFi Nodes may also support WiFi
Only devices
Some Concluding Remarks
Evolution to 4G Wireless should
Make best of limited but all radios available in mobile devices
Make best use of locally and temporally available spectrum
Take a holistic approach to WWAN and WLAN Evolution; aiming to improve the operation of Multimode 5G (LTE/WiFi) Devices & WiFi Only Devices
There is a large amount spectrum (unlicensed or shared) at/below 5GHz which can be leveraged while or before moving to higher frequencies.
100’s of MHz Worldly available Spectrum, Many already supported on devices!
Small Cells/HetNet can enable and benefit greatly from Opportunistic Local Spectrum Access
Generalization of Carrier Aggregation to inter-eNB and Inter-RAT are early enablers
Realization of Dynamic Spectrum Sharing , e.g. SAS, is another key enabler
9K. Etemad LTE/5G World Summit, Amsterdam 2014
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Remember! The opinions expressed in this presentation are those of the author and do not necessarily represent the views of the Federal Communications Commission or the United States Government.
Contact: [email protected]
K. Etemad LTE/5G World Summit, Amsterdam 2014