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Time sync: Existing mobile networks need to be ready for 5G and time-sensitive applications

At ITSF 2020, Jörg Urban explored how networks can evolve quickly to solve new time and sync challenges. He discussed advanced technologies for backing up GNSS signals with network-based timing in order to satisfy the demands of the most time-sensitive applications, enhancing resilience and enabling significant capex and opex savings.

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Time sync: Existing mobile networks need to be ready for 5G and time-sensitive applications

  1. 1. Time sync: Existing mobile network to be ready for 5G ITSF, November 2020 Mustafa Tugrul Sayin (TURKCELL) & Jörg Urban (ADVA)
  2. 2. © 2020 ADVA. All rights reserved. Confidential.22 5G Time Sync challenges at a glance LTE Advanced CoMP, TDD: 1.1µs time sync LTE – multicast: several µs time sync 3G TDD: 5µs time sync (large cells) 2G/3G – frequency sync only 5G – positioning: <100ns TAE(cluster) 5G – CA, IoT: 130/260ns TAE(cluster) 5G – TDD & eCPRI/new XHaul: 1.1µs maxTE • Spectrum efficiency • Technology • New applications (IoT) • Regulations
  3. 3. © 2020 ADVA. All rights reserved. Confidential.33 GNSS as a single point of failure … Need for a new timing and sync solution Installation issues (obstruction) Interferences (TV, cellular, radar, µWave, …) • Intentional (jamming), unintentional Multipath caused by buildings Spoofing GNSS outages Atmosphere (solar activities) Indoor and outdoor (urban canyons)
  4. 4. © 2020 ADVA. All rights reserved. Confidential.44 Network-based time sync stepwise implementation - Cell site gateway with edge GM Cell site gtwy 1st step Edge GM to minimize GNSS ant. 5G RRU eBBU ePRTC 2nd step ePRTC for back up SSU PTP NTP Core sites Backhaul network
  5. 5. © 2020 ADVA. All rights reserved. Confidential.55 Edge grandmasters are most agile, reliable, cost-efficient, vendor-neutral solution Capex consideration - Edge GM being shared among multiple BBU/DU sites Core GMEdge GM • (1) Sharing cost by supplying sync to several cell sites from aggregation site • (2) High availability by adding network-based time sync • Mobile equipment supplier agnostic assurance • Flexibility when adding more BBUs (4G) or 5G • GNSS performance managed proactively (2) (1) Years 1 2 3 4 Total Total Cost (CAPEX) # of BBUs 5000 5000 5000 5000 20.000 Cost per local GNSS 300,00€ 1.500.000,00€ 1.500.000,00€ 1.500.000,00€ 1.500.000,00€ 6.000.000,00€ Average # of BBUs per 1st Aggr. Site 15 15 10 10 PTP GM 8275.1 333 333 500 500 1.667 Cost per PTP GM 2.000,00€ 666.666,67€ 666.666,67€ 1.000.000,00€ 1.000.000,00€ 3.333.333,33€
  6. 6. © 2020 ADVA. All rights reserved. Confidential.66 SLA enabling sync architecture for mission-critical communication networks The new timing and sync solution – Highly accurate and redundant time-keeping, distribution and assurance Core network Ensemble of highly precise and accurate ePRTCs < +/-30ns to UTC L2/L3/WDM access network ePRTC ePRTC ePRTC Aggregation/ Access Network COs enabled to provide time information to variety of consumers Better +/- 100ns (PRTC-A) 4G / 5G NG Sync DeviceNG Sync Device SSU PTP Enterprises / Wholesale NTP SSU PTP NTP Applications Better +/- 1000ns to UTC Syncnetworkandservicemanagement Timing over optical transport Smart Grid
  7. 7. ITSF, November 2020 Time sync existing mobile networks to be ready for 5G Mustafa Tugrul SAYIN - TURKCELL
  8. 8. Agenda 01 02 03 About TURKCELL Time Sync Solution in Turkcell Network Ongoing activities and Future Plans
  9. 9. STRATEGY APPROACH: WELL-POSITIONED TO CREATE MORE VALUE
  10. 10. Steps Taken to Time Sync Our Network Core GMs at EPCs Edge GMs in aggregation rings Lab & Field tests; T-BC performance tests network performance tests PTP full on-path profile G.8275.1 & SyncE Best Practice for 5G! Monitor & Report & Act to maintain the TimeSync Network node configurations PTP&SyncE > T-BC mode eNodeB Profile change FREQ>TIME + SyncE LTE-A inter-eNodeB CA
  11. 11. Our Time Sync Solution at a glance… CoreAggregationAccess Mobile Services Fixed Services UPE NPE PTP G.8265.1 PTP G.8275.1 & SyncE PTP G.8275.2 APTS 30 nsec phase accuracy 14 day holdover 100nsec All-in-one Data Center Solution40nsec phase accuracy 5G fronthaul solutions CU/DU Core GM PRTC Edge GM PRTC Edge GM PRTC-BMini GM ePRTC NTPPTPSSU PTP FREQ PTP G.8275.1 & SyncE PTP FREQ PTP FREQ PTP FREQ PTP FREQ PTP FREQ T-BC T-BC T-BC T-BCT-BC T-BC T-BCT-BC T-BC PTP TIME PTP TIME PTP TIME PTP TIME OC OC
  12. 12. • ePRTC nodes for resiliency and better accuracy • PRTC-B for better accuracy • More Edge/Mini GMs for service coverage and GM redundancy in the network Modernization • 5G capable network nodes comply with T-BC class C or D • Fix-Mobile Convergence lessens number of nodes with better time budgets PTP traceability • In-house STAR tool; Time Sync chains GM to eNodeB • In-house NPT tool; node configs and PTP reports • Probing to monitor phase accuracy - OTA TAE tests 5G Readiness • Time synced LTE network ready for 5G with; • ePRTC/Core GMs at core • Edge GMs at backhaul • Mini GMs to be used for fronthaul topology Improve & Expand Network Fully PTP aware Monitoring End-to-end Towards 5G network Reliable Sync Coverage
  13. 13. Thank you
  14. 14. Thank you IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited. The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation. Copyright © for the entire content of this presentation: ADVA.

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