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.

1. Time sync: Existing mobile network to be
ready for 5G
ITSF, November 2020
Mustafa Tugrul Sayin (TURKCELL) & Jörg Urban (ADVA)

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. © 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)

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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

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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€

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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. ITSF, November 2020
Time sync existing mobile
networks to be ready for 5G
Mustafa Tugrul SAYIN - TURKCELL

8. Agenda
01
02
03
About TURKCELL
Time Sync Solution in Turkcell Network
Ongoing activities and Future Plans

9. STRATEGY APPROACH: WELL-POSITIONED TO CREATE MORE VALUE

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. 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. • 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. Thank you

14. Thank you
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