Time and Phase Delivery
Time and Phase Delivery and Assurance in Mobile
Networks
Gil Biran

ITSF 2013
Lisbon, Portugal
Agenda
• Delivering time and phase in mobile backhaul networks
• Addressing the LTE-A challenges
• Implementing synchroniz...
Delivery and Assurance of Time and
Phase in Mobile Backhaul Networks

3

© 2013 ADVA Optical Networking. All rights reserv...
Synchronization as a Service Scenarios
Mobile Network
Operator

Access and Backhaul Network
Operator

UNI

UNI

Cell Site
...
LTE Synchronization Challenges

Source: Symmetricom
5

© 2013 ADVA Optical Networking. All rights reserved. Confidential.
Frequency & Phase Synchronization
PE

PE

2.6613944GHz

MPLS Core
For L2 & L3 VPN etc.
100M

PE
GE

Optical Core
For High ...
Frequency, Phase and Time Synchronization
Channel Change
• 2 Streams of video
• Cut over exactly
between two frames

PE

P...
Time and Phase Assurance in Mobile
Synchronization Network
•

Q. What is the Sync distribution
topology?
•

•

Q. What is ...
Addressing the LTE-A challenges

9

© 2013 ADVA Optical Networking. All rights reserved. Confidential.
The 500nsec Phase Synchronization
Challenge
• LTE-Advanced requires phase synchronization accuracy of 500ns for
handovers ...
G.8275.1 Synchronization Model
• Synchronization model set forth in G.8275.1 mandates for full On
Path Support of PTP plus...
Bringing Primary Time Reference Clock with
Mini Grand Master Close to the Cell Site
• When considering phase/time distribu...
G.8275.2 Synchronization Model
• Synchronization model set forth in G.8275.2 (under study) is calling
for Two options for ...
Assisted Partial Timing Support (APTS)
• The concept was introduced by Sprint at SG15/Q13 ITU meeting in
Kansas on 10/2013...
Assisted Partial Timing Support (APTS)
Deployment Cases
•

The PRTC is co-located with the Slave Clock - Legacy deployment...
Implementing Synchronization
Delivery and Assurance in Brownfield
Mobile Backhaul Networks

16

© 2013 ADVA Optical Networ...
Mini Grand Master Plus with Syncprobe
• Mini Grand Master and BC function

• Built In GPS receiver allows asymmetry delay
...
Mini Grand Master Plus Deployment
Mini GM
PRC/PRTC

Syncprobe

PRC/PRTC

Distributed timing

S-GW
RNC

In door
Small cell
...
Main Requirements for Mini GM Plus
•

Frequency, phase and time delivery with Mini GM/BC
•
•

Reference B : PTP or PTP+Syn...
eNB Sync Key Performance Indicators
•

The GNSS/GPS reference can be used for calculation of the
relevant sync KPI

•

Clo...
Add On Hybrid Synchronization Network
Without Pain
• The majority of the Mobile Backhaul (MBH) Networks has limited
suppor...
Enabling Time/Phase G.827x PTP Network
Mobile Backhaul Operator case
Customer Premise

Access

Aggregation

10GE MEN

Core...
Enabling Time/Phase G.827x PTP Network
Mobile Operator case
Customer Premise

Access

Aggregation

10GE MEN

Core

PRC
Gra...
Sync Manager Requirements

24

© 2013 ADVA Optical Networking. All rights reserved. Confidential.
Sync Manager Requirements Overview
• Sync Manager need to learn, monitor, configure and display
synchronization network to...
Sync Manager Functions
•

• Sync Map
•
•
•
•

Topology Map and Tree
Hierarchy and clock distribution
Clock status
Sync Hea...
Sync Map with Active Sync Route

27

© 2013 ADVA Optical Networking. All rights reserved. Confidential.
Syncprobe Tests– Test Results Display

MTIE Result

PTP Network Statistics Results
28

© 2013 ADVA Optical Networking. All...
Sync Monitoring Status Display
 Sync Map provides visual
indication
for Sync Components
that are monitored by
Syncjack to...
Synchronization Services Enabling
with the Syncprobe as Sync Tool Box
• Synchronization Interface Demarcation (SID) allows...
Thank you
Gbiran@advaoptical.com

IMPORTANT NOTICE
The content of this presentation is strictly confidential. ADVA Optical...
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Time and Phase Delivery

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Gil Biran, from ADVA Optical Networking, presented these slides on time and phase delivery at this year’s ITSF in Lisbon, Portugal.

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  • ---- add assymetry to Q.
  • Mini GM main clock source is GPS.SyncE and PTP are used for backup thus avoiding expensive holdover oscillator.
  • I think this slide is good however there are a few questions… (some of these are tricky)If there is an FSP 150 can they all provide SyncJack?If there is an FSP 150 would we also need to provide a SyncProbe?Do we need a SyncProbe at every location in the this cloud or can we skip some nodes (how do we determine this)?
  • Time and Phase Delivery

    1. 1. Time and Phase Delivery Time and Phase Delivery and Assurance in Mobile Networks Gil Biran ITSF 2013 Lisbon, Portugal
    2. 2. Agenda • Delivering time and phase in mobile backhaul networks • Addressing the LTE-A challenges • Implementing synchronization delivery and assurance in Brownfield MBH Networks • Sync manager requirements • Summary clock tower in mount tabor Catholic Church 2 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    3. 3. Delivery and Assurance of Time and Phase in Mobile Backhaul Networks 3 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    4. 4. Synchronization as a Service Scenarios Mobile Network Operator Access and Backhaul Network Operator UNI UNI Cell Site Mobile Network Operator Backhaul Network Mobile Core • Mobile Backhaul Network Scenarios • Owned by the MNO transport division or MNO sister company • Owned by 3rd party Mobile Backhaul wholesale provider 4 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    5. 5. LTE Synchronization Challenges Source: Symmetricom 5 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    6. 6. Frequency & Phase Synchronization PE PE 2.6613944GHz MPLS Core For L2 & L3 VPN etc. 100M PE GE Optical Core For High Speed Services 2.6613944GHz GE 10G Frequency & Phase Sync Distribution Time Division Duplex 2.6613944GHz • LTE-TDD 2.6613944GHz 2.6613948GHz 6 • LTE Advanced © 2013 ADVA Optical Networking. All rights reserved. Confidential. PE
    7. 7. Frequency, Phase and Time Synchronization Channel Change • 2 Streams of video • Cut over exactly between two frames PE PE • e.g.12:47:36:150 MPLS Core For L2 & L3 VPN etc. 100M PE GE PE Optical Core For High Speed Services GE 10G Frequency, Phase & Time Sync Distribution Applications • Video Distribution • LTE Co-ordinated Multi-Point Transmission 7 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    8. 8. Time and Phase Assurance in Mobile Synchronization Network • Q. What is the Sync distribution topology? • • Q. What is the PTP clock devices performance? • • 8 A. PTP communication path PDV and Asymmetry measurements and monitoring Q. What is the Slave clock status and performance? • • A. Clock performance measurement and monitoring on frequency and packet domains Q. What is the communication path performance? • • A. Sync topology discovery A. Slave clock performance estimation even if the sync reference is not available in same location … © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    9. 9. Addressing the LTE-A challenges 9 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    10. 10. The 500nsec Phase Synchronization Challenge • LTE-Advanced requires phase synchronization accuracy of 500ns for handovers and high-quality real-time services • • LTE CoMP - LTE supports Coordinated Multi-Point Transmission LTE eICIC application -LTE-Advanced has been developing enhanced inter-cell interference coordination (eICIC) techniques • Achieving this level of phase accuracy is very challenging considering Packet Delay Variation performance and difficulties of estimation of the delay asymmetry in the Mobile Backhaul Network • 500ns phase synchronization accuracy may be achieved in one or more of the following options • • • 10 On Path Support (OPS) as define in G.8275.1 profile Deploying Mini Grandmaster near or at the Cell Site as define in G.8272 Appendix 4 New Telecom PTP profile with partial support from the network as define in G.8275.2, including PRTC (GNSS) near the Cell Site © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    11. 11. G.8275.1 Synchronization Model • Synchronization model set forth in G.8275.1 mandates for full On Path Support of PTP plus SyncE • Timing support from the network is required to meet the stringent requirements for time/phase accuracy (500nsec) in mobile networks • On Path Support may require • • Hardware swap out, or A completly new network (Greenfield) • G.8275.1 architecture may require major CAPEX to upgrade existing networks forcing service providers to look for more cost effective alternativites B A C D E End Application PRTC PRC / T -GM T -BC T -BC T -BC T -BC Slave Clock Packet Network 11 © 2013 ADVA Optical Networking. All rights reserved. Confidential. ~ ~ Distributed Arch ( e . g . CPRI )
    12. 12. Bringing Primary Time Reference Clock with Mini Grand Master Close to the Cell Site • When considering phase/time distribution, the PRTC functions can be located at different positions, depending on the overall architecture that the network operator wishes to follow. • These can be summarized into the four generic locations A, B, C and D described in the figure below • Bringing PRTC close to the End user improves synchronization delivery performance D C Backhaul network B A Core network End application (e.g. base station) PRTC PRTC output time reference signal Time synchronization path PRC Source G.8272/Appendix IV 12 Frequency reference (e.g. used to secure GNSS failures) © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    13. 13. G.8275.2 Synchronization Model • Synchronization model set forth in G.8275.2 (under study) is calling for Two options for Partial On Path Support • • Pure Partial Timing Support as described below Assisted Partial Timing Support as describe in next slides • Pure Partial Timing Support without PRTC support near the Cell Site • Assisted Partial Timing Support with PRTC support near the Cell Site • G.8275.2 architecture address a real pain of Mobile Operators • • Using multiple 3rd party MBH wholesale providers without full OPS Using their own MBH network which will not support full OPS any time soon due to extensive complexity and cost of such upgrade A B C D E End Application PRTC/ PRC T-GM Packet Network T-BC-P Packet Network T-BC-P Slave Clock ~ ~ Distributed Arch (e.g. CPRI) 13 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    14. 14. Assisted Partial Timing Support (APTS) • The concept was introduced by Sprint at SG15/Q13 ITU meeting in Kansas on 10/2013 • Some operators already have GNSS (GPS) for synchronization of base stations for legacy network synchronization • Known vulnerability of GNSS causing operators to seek for methods of backing up local GNSS failures with PTP • The presence of a GNSS reference provides accurate frequency and time information that may be utilized by the PTP clock in the event of a GNSS failure. This is referred to as Assisted Partial Timing Support (APTS) 14 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    15. 15. Assisted Partial Timing Support (APTS) Deployment Cases • The PRTC is co-located with the Slave Clock - Legacy deployment of GPS in cell sites PRTC A C B D CSR/ SA Clock PRTC/ PRC Packet Network T-GM T-BC-P Packet Network E End Application T-TSC-P ~ ~ Distributed Arch (e.g. CPRI) • The PRTC is co-located with the Boundary Clock – Greenfield deployment of GPS in First cell aggregation node PRTC A C B D CSR/ SA Clock PRTC/ PRC T-GM Packet Network T-BC-P Packet Network T-BC-P E End Application Slave Clock ~ ~ Distributed Arch (e.g. CPRI) 15 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    16. 16. Implementing Synchronization Delivery and Assurance in Brownfield Mobile Backhaul Networks 16 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    17. 17. Mini Grand Master Plus with Syncprobe • Mini Grand Master and BC function • Built In GPS receiver allows asymmetry delay measurement for clock recovery calibration • Receiving clock from GPS as main source • PTP and SyncE as a fallback in case of GPS failure due to limited holdover of standard OCXO GPS Antenna • Holdover of One month for 16ppb but only 30-90 min for +/- 1.5usec Phase • Together with SLA assurance tools Access and Backhaul Network Trusted MBH Operator Mobile Network Operator Mobile Network Operator Grand Master Syncprobe UNI PTP/Sync-E Cell Site 17 Backhaul Network © 2013 ADVA Optical Networking. All rights reserved. Confidential. Mobile Core
    18. 18. Mini Grand Master Plus Deployment Mini GM PRC/PRTC Syncprobe PRC/PRTC Distributed timing S-GW RNC In door Small cell PRC/PRTC Slave Clock Mini GM Syncprobe Transparent Clock Boundary Clock Grand Master GNSS/GPS as primary reference and PTP/PTP+SyncE as secondary reference(i.e. APTS) or Vice Versa, depend on PTP reliability and accuracy 18 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    19. 19. Main Requirements for Mini GM Plus • Frequency, phase and time delivery with Mini GM/BC • • Reference B : PTP or PTP+SyncE • Ref A as Primary and Ref B and Secondary clock source without good PTP On Path Support or vice versa with On Path Support • Support relevant holdover requirements during GNSS outage • • Reference A : GNSS based PRTC – G.8272 GNSS based asymmetric delay calibration which improve PTP accuracy Frequency, phase and time assurance with Mini GM/BC • • 19 Measurement of the relevant KPI related to Network and PTP recovered clock/phase/time • BC quality in the same node • Slave clock quality in the remote Macro and Small Cells nodes Collect slave clock quality of multiple eNB at a time by using multiple PTP passive probes in one device © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    20. 20. eNB Sync Key Performance Indicators • The GNSS/GPS reference can be used for calculation of the relevant sync KPI • Clock related KPI • TIE and MTIE Masks • Maximal Time Error (TE) Clock related KPI measurement can be done in 2 ways • • Based on measurement of physical clock (i.e. 1PPS) • Based on measurement of packet timing signal (i.e. Passive Probe) PTP Network related KPI • • • • • 20 PTP Packet counters (received /lost ) Network Asymmetry Path delay /Mean path delay (min, max, average ) Floor Packet Percentage (based on G.8260) © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    21. 21. Add On Hybrid Synchronization Network Without Pain • The majority of the Mobile Backhaul (MBH) Networks has limited support of Synchronization • Syncprobe as add on to Existing (Brownfield) mobile backhaul networks • • Fits Mobile Backhaul Operators and Mobile Network Operators Allows delivery and assurance of the synchronization services • Operating as TS, TC or BC and attached to existing Network Nodes • Enabling PTP overlay on top of existing MBH Networks • Low cost, ease of installation and operation, PTP performance monitoring and diagnostic, Synchronization management 1588v2 Slave 1588v2 Master Access PTP Packets 21 © 2013 ADVA Optical Networking. All rights reserved. Confidential. Core
    22. 22. Enabling Time/Phase G.827x PTP Network Mobile Backhaul Operator case Customer Premise Access Aggregation 10GE MEN Core PRC Grand Master Slave Clock S-GW RNC Slave Clock Slave Clock Syncprobe Slave Clock 22 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    23. 23. Enabling Time/Phase G.827x PTP Network Mobile Operator case Customer Premise Access Aggregation 10GE MEN Core PRC Grand Master Slave Clock S-GW RNC Slave Clock Mini GM Syncprobe Slave Clock 23 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    24. 24. Sync Manager Requirements 24 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    25. 25. Sync Manager Requirements Overview • Sync Manager need to learn, monitor, configure and display synchronization network topologies (IEEE 1588/PTP, SyncE and hybrid), a.k.a. Sync Map • Sync Manager need to displays Sync Routes in order to identify an active clock stream from Master to Slave • The Sync Routes should enable to identify problems in any of the nodes and also allows recognizing loops • Sync Manager should allow user to initiate, configure, schedule, and display Sync probe tests and test results • Sync Manager should present Sync Health status per Sync Node and also aggregated Sync Health status e.g. in Network Clock Domain (NCD) or in selected Master-Slave Hierarchy. 25 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    26. 26. Sync Manager Functions • • Sync Map • • • • Topology Map and Tree Hierarchy and clock distribution Clock status Sync Health Syncprobe monitoring and diagnostics for Clock Accuracy, Clock Analysis, PTP Network Analysis • Sync Routes • • • Route Info Route alarm and status Route Statistics • Sync Components • • • • • • 26 SyncE Node PTP TC PTP BC PTP MC PTP OC-S Network Clock Domains © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    27. 27. Sync Map with Active Sync Route 27 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    28. 28. Syncprobe Tests– Test Results Display MTIE Result PTP Network Statistics Results 28 © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    29. 29. Sync Monitoring Status Display  Sync Map provides visual indication for Sync Components that are monitored by Syncjack tools.The icon color indicates the status of In-Service Telecom Slave(s) scores and/or ongoing tests.  Synchronization pane presents correlated overall SJ Health status per Sync Node(s)/NCD(s)/Route  Several levels of details allows step by step troubleshooting  29 Global – High level, based on all Syncjack tests monitoring results  Detailed - based on Syncjack tests monitoring results per Category and TS Score © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    30. 30. Synchronization Services Enabling with the Syncprobe as Sync Tool Box • Synchronization Interface Demarcation (SID) allows Synchronization as a service • Sync services assurance with proactive PTP communication path and clock recovery performance monitoring and diagnostic • Enhanced PTP Slave clock capabilities with self calibration based on network PDV and Asymmetry, performance monitoring and diagnostics • Unique self calibration which is based on self learning of the network • Mini Grand Master with fallback to PTP recovered clock or Sync-E timing reference • PTP enabling mode with BC and TC capabilities • 30 Allow full or partial On Path Support for Brownfield mobile backhaul networks without PTP support © 2013 ADVA Optical Networking. All rights reserved. Confidential.
    31. 31. Thank you Gbiran@advaoptical.com IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA Optical Networking 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 Optical Networking 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 Optical Networking.
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