This ITSF 2016 presentation from Djamila Duc looks into field-testing to prove the feasibility and performance of small cells and IP RAN as well as the solutions being developed. A major mobile operator in the Middle East is rapidly deploying this technology and is trying optimize the solution by distributing frequency over high-bit-rate digital subscriber line (HDSL) and IP. However, reducing the high level of packet delay variation that affects quality is a big challenge. As it is impossible to use SyncE, deep field-testing of Precision Time Protocol over HDSL is required. The adopted solution is a combination that covers the frequency needs for legacy time-division multiplexing and the phase needs for future long-term evolution deployments.

1. Case Study:
Small Macro Cell Sync Solution
ITSF, Nov 2016
Mr. Sherif Abdel Hamid, Senior Engineer, Orange Egypt
Dr. Djamila Duc, Business Development Director MEA, Oscilloquartz

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Orange Egypt (i.e. Mobinil)
 1st and biggest mobile operator in Egypt
 2G/3G/4G/LTE mobile operator
 Number of mobile BTSs: above 5000 sites
 Number of mobile subscribers: 35 million
 On October 14, 2016, Orange acquired its fourth-generation (4G) internet
services license after signing a 484 million USD agreement with the national
telecom regulator
 Entity of Orange Group since 2012  100% shares

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Oscilloquartz & ORANGE: Long-Term Relationship
 Oscilloquartz & Orange met in 1997 thanks to NEC
Oscilloquartz products deployed
in Orange Network:
 Cesium
 SSU: OSA 5548C with PTP cards
 GNSS receivers: OSA 5240, OSA 5210
 PTP grandmasters: OSA 5421 (recently)
 Sync probing solution
 Network management systems: SyncView Plus and FSP NM
Network design services and others OSA 5240
OSA 5210
OSA 3230B
OSA 5548C
TCC-PTP Card
OSA 5421

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Heading Towards Carrier Ethernet Networks
• Rapid deployment of small-cell solutions that are compatible only
with IP backhauling
• Existing plan to shift all existing RAN to IP with accordance to IP-
2020 program.
• In accordance with the above plan, transport network
deployments move from legacy SDH, PDH towards IP-MPLS
network deployment
• Existing TDM synchronisation using legacy PRC/SSU architecture
was no longer suitable

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Network Restrictions and Explored Solutions
• Backhauling capability to handle such small cell deployment is only
through 3rd party HDSL (i.e. Telecom Egypt)
• Part of IP-MPLS cloud is also 3rd Party with unknown PDV performance
• Network is a PTP unaware network (brownfield network)
• SyncE  Not suitable for such small cell deployment over HDSL, can
only be used for macro site deployment
• PTP 1588-V2  Suitable for small cell deployment but with unknown
performance over PTP unaware network/3rd party leased lines
Which solution for best sync performances: SyncE vs PTP?

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Adopted Sync Solution
Proof of concept is necessary to validate achieved sync
performance over each scenario

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RNC IP/MPLS
Router(P/PE)
IP/MPLS
Router(PE)
GE
MW
IP/MPLS Cloud
(SDH Cloud)
Node-B
(Full IP)
GE/FE
GE
Core Site Aggregation Site Node-B Site
PTP Master
Clock (SSU)
PTP Slave
PTP BC/Probe
(5410)
PTP Master Chain PTP Probe/BC Chain PTP Slave Chain
PTP 1588 -V2 Test Scenario #1

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RNC
IP/MPLS
Router(P/PE)
ModemModem
IP/MPLS
Router(PE)
GE
HDSL
GE/FE GE/FE
IP/MPLS
Cloud
Atom Cell
PTP Master
Clock (SSU)
PTP BC/Probe
PTP Slave
Core Site Aggregation/Node-B Site
PTP Master Chain PTP Probe/BC/Slave Chain
PTP 1588 -V2 Test Scenario #2

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Test 1: Macro node-B through MW link chain with ITUT G.82651 (frequency synchronization)
Test 2: Huawei ATOM cell through HDSL 3rd party (TE) with ITUT G.82671 (phase synchronization)


PTP 1588 -V2 Tests and Results

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Conclusion
• Successful testing and best approach determined and approved
• Adopted product is OSA 5421
 PTP delivery (freq and phase with 512 slaves capacity) with latest ITU-T
standards
 16X BITS outputs
 Sync probing or real-time monitoring included
 NTP server capabilities
• Solution currently under deployment (phases-based)
• Ongoing 4G design and OSA 5421 may be massively deployed in future
ISA
Orange Egypt is satisfied with Oscilloquartz solutions as usual

11. info@advaoptical.com
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