CORE++ Cognitive Radio Trial Environment Project Part of the Tekes 5thGear programme and 5GTNF

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1 VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD Field Trial of the 3.5 GHz Citizens Broadband Radio Service Marko Palola VTT Technical Research Centre of Finland Ltd, Oulu, Finland 1 Marko Höyhtyä 1, Pekka Aho 1, Miia Mustonen 1, Tero Kippola 2, Marjo Heikkilä 2, Seppo Yrjölä 3, Vesa Hartikainen 3, Lucia Tudose 3, Arto Kivinen 4, Reijo Ekman 4, Juhani Hallio 4, Jarkko Paavola 4, Marko Mäkeläinen 5, and Tuomo Hänninen 5 2 CORE++ Cognitive Radio Trial Environment Project Part of the Tekes 5thGear programme and 5GTNF 5 4 3

2 Field Trial of the 3.5 GHz Citizens Broadband Radio Service Marko Palola, VTT Technical Research Centre of Finland Ltd, Oulu, Finland Contents 1) Introduction 2) Spectrum 3) Field trial 4) Performance results 5) Conclusions 2

3 Field Trial of the 3.5 GHz Citizens Broadband Radio Service A field trial of spectrum access system (SAS) based Citizens Broadband Radio Service (CBRS) in the 3.5 GHz band is presented Live LTE-A test network in Finland is used with commercial base stations, LTE Core and Network Management System. Performance measurements carried out Performance analysis of field trial is presented 3

4 Field Trial of the 3.5 GHz Citizens Broadband Radio Service Research motivation On-going standardization and implementation of the specification Can we implement SAS using commercially available mobile networks and equipment? Does the real system meet the set time limits when using commercially available mobile networks and equipment? How long it takes to set up LTE-A mobile broadband using dynamical spectrum? Are there some ways to speed up the process? 4

5 Field Trial of the 3.5 GHz Citizens Broadband Radio Service Contents 1) Introduction 2) Spectrum 3) Field trial 4) Performance results 5) Conclusions 5

6 Spectrum Part of Citizens Broadband Radio Service (CBRS) for shared wireless broadband use of the 3.5 GHz band, an U.S. standard Allows dynamic 3-tier sharing in an area Incumbent, Priority Access License, General Authorized Access Environmental Sensing Capability (ESC) and database based operation On-going activities by the FCC and the Wireless Innovation Forum. 6

7 Spectrum Dynamic Spectrum Sharing Incumbents protected from interference PA users protected from interference GAAs are not protected Band divided to channels, 10MHz each GAAs have dedicated channel PAL channels available to GAAs if idle Primary user activity takes 2 channels Field trial uses MHz, four 10MHz channels 3+1 configuration 7

8 Spectrum Reference Architecture SAS in an area Determines available frequencies Assigns them to different CBSDs Sets transmission power limits Domain Proxy Manages multiple CBSDs Allows legacy systems to connect Individual CBSD Access SAS for shared spectrum Environmental Sensing Capability Detects primary user activity 8

9 Field trial of the 3.5 GHz Citizens Broadband Radio Service Contents 1) Introduction 2) Spectrum 3) Field trial 4) Performance results 5) Conclusions 9

10 Field trial: Architecture CORE++ CORE++ has setup a unique live LTE test network with commercial 4G/LTE-A 10

11 Field trial: Architecture CORE++ 1) ESC determines availability of shared spectrum based on collected occupancy information (frequency, bandwidth, power) 2) SAS Repository gathers data about spectrum use and base stations. 3) Domain Proxy and stand-alone base station connect to CBSD Manager for shared spectrum access (REST API). 4) SAS Algorithm for channel allocations and optimizations 5) DP uses NMS to configure the base stations (PA, GAA) accordingly. 6) Stand-alone base station (CBSD-3) provides self-management. 11

12 CORE++ Field trial: Radar Sensing System Radar signal was generated Pulse repetition frequency 1 khz Pulse width 0.9 µs Antenna scan rate 15 RPM Antenna beam width 1.8 degrees A spectrum sensing device is used to collect the occupancy data. frequency resolution of khz Occupancy scan every 45 seconds. Signal detection level used -90 dbm 12

13 Field trial: LTE 3.5 GHz network CORE++ Three commercially available Flexi Multiradio time-division 3GPP Release 10 (TD)-LTE 3.5 GHz base stations 3GPP band 42 ( GHz) Configured to indoor usage, low power LTE management system LTE core network 13

14 Field trial of the 3.5 GHz Citizens Broadband Radio Service Contents 1) Introduction 2) Spectrum 3) Field trial 4) Performance results 5) Conclusions 14

15 Performance results : Channel Evacuation ESC ESC Alert SAS performs channel optimisation assessment SAS Heartbeat Request Heartbeat Response Waiting for Heartbeat Heartbeat Request Heartbeat Response (new operational parameters) CBSD/DP Relinquish Request Relinquish Response Heartbeat duration expires; Reset Heartbeat duration timer Heartbeat duration expires; Reset Heartbeat duration timer Band evacuation and reconfiguration of base stations Grant to SAS band is given to CBSD, CBSD reports using a heartbeat request. ESC detects a channel not available SAS decides to deny the grant CBSD gets info on next heartbeat response. CBSD reports channel is freed 15

16 Performance results : Reconfiguration time CBSD/DP is requesting a new channel from SAS by placing a Grant Request SAS approves or denies the response Optional spectrum inquiry to check availability of channels CBSD responds with Heartbeats to indicate transmission attempt 16

17 Performance results : Measurement points Td Evacuation time Te T0 T1 T2 T3 T4 Radar sensed to appear ESC combines sensor information and generates an ESC Alert CBSD Manager sends relevant information to SAS algorithm SAS algorithm optimizes the band allocations Domain proxy sends commands to NMS according to SAS algorithm responses Te Frequency change time Tw T5 T6 T7 T8 T9 NMS begins configuration of CBSD Band is cleared, CBSDs no more operating in the band Grant request is sent to SAS SAS algorithm determines suitable band and radio parameters for operation Grant response is sent to CBSDs Tw Transmission Td T10 T11 T12 T13 Heartbeat NMS begins configuration of CBSD Operation continues in a new band Heartbeat 17

18 Performance results : Evacuation perf. results 18

19 Performance results : Reconfiguration time, the results 19

20 Field trial of the 3.5 GHz Citizens Broadband Radio Service Contents 1) Introduction 2) Spectrum 3) Field trial 4) Performance results 5) Conclusions 20

21 Conclusions Analyzed time domain operation in a practical SAS based CBRS system The most time-consuming phases in the evacuation and reconfiguration process are base station configuration: locking/unlocking/changing freq FCC operational rules were met in the field trial Evacuation is confirmed within 300 seconds from detection of incumbent CBSD/DPs must comply with SAS commands within 60 seconds Improvements (up-to 70%): support fast on-air frequency changes. Large scale : NMS emergency plans to evacuate large networks 21

22 VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTD The First End-to-End Live Trial of CBRS with Carrier Aggregation Using 3.5 GHz LTE Equipment For further information, please visit the CORE++ project website: Project Manager: