1. Timing Excellence for
Mobile Backhaul Networks
Dr. Michael Ritter
October 17th, 2012

2. ADVA Optical Networking
Our History
• More than 15 years of innovation
Our Markets
• Operator, enterprise, government, research & education
Our Quality Commitment
• TL 9000 and ISO 14001
Our Leadership
• #1 in Ethernet Access Devices and #4 in Metro WDM
“Our mission is to be the trusted partner for
innovative Optical+Ethernet transport solutions
that ADVANCE next-generation networks for
data, storage, voice and video services.”
Your trusted partner for speed and innovation
2 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

3. Our Solutions
Ethernet Access Metro Core
Optical Access
Enterprise
3 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

4. Evolution of the Mobile Network
More
Connections
More
Video
Faster
Speeds
More
Users
Usage patterns have changed in many dimensions
4 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

5. Carrier Ethernet Backhaul
Scalable Economic
Technology Solution
Multi-Point Quality of Service
Capability Differentiation
Departing from TDM interrupts timing distribution
5 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

6. Frequency Distribution Is a Must
• Avoid interference between adjacent cells
• Soft handover for wireless mobility
Frequency Synchronization
• Required by all air
TA=1/fA
interface types
A
• Stability of 50pbb or TB=1/fB
better required B
fA = fB
Synchronization must now be engineered into the network
6 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

7. Precise Time Alignment Becomes Key
• Time Division Duplex (TDD) modes
• Coordinated Multi-Point (CoMP) transmission
• Essential for LTE Advanced
• Inter-cell phase of less
than ± 3µs
High-quality synchronization required at all cell sites
7 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

8. Timing Distribution Alternatives
RAN synchronization is not trivial
• Synchronous Ethernet vs. 1588v2
• Likely combination of both
• Underlying infrastructure needs to be capable
Assured delivery Transparent Clock
• Availability Time of Day Wander
• Quality
Frequency
Assurance
• Robustness
Jitter
Boundary Clock
Tomorrow’s challenges need to be addressed today
8 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

9. 3GPP LTE Architecture
Control plane separation and X2 interface
• Departure from the traditional hub-and-spoke architecture
• Deeper backhaul network compared to 2G
MME HSS/PCRF
Challenges
• Network size S1-C S6a
S1-C
• Complexity
X2 S11 Gxc S7/Gx
• Latency & jitter S1-U
S1-U S5/S8 SGi
Technology
PDN
• GATEWAY
UE eNodeB SGW PDN GW Internet
Synchronization network needs to be planned carefully
9 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

10. Network Technologies Are Manifold
Physical media alternatives
• Fiber, microwave, copper – depending on availability and need
• Likely a combination of all
From layer 1 to layer 3
Microwave
• Carrier Ethernet
Fiber
• OTN/WDM IP/MPLS
Copper
• IP/MPLS OTN/WDM
Carrier Ethernet
Active and passive participation in timing distribution
10 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

11. Small Cells
Implications from small cell deployment
• Many more sites though relaxed timing requirements
• Multi-stage backhaul network
infrastructure
Various base station types
• Macro cells Small Cells
• Small cells PDN
GATEWAY
• Not so much femto cells Macro Cell Evolved
Packet Core
Femto Cells
Synchronization network will grow significantly
11 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

12. Multi-Operator Environment
Mobile Network Access and Backhaul Network Mobile Network
Operator Operator Operator
UNI
UNI
Cell Site
Backhaul Network Mobile Core
Characteristics of data and timing service defined at the UNI
12 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

13. Managing Synchronization Networks
Network Accuracy Tools and
View Measurement Procedures
Topology Map Stability Monitor Alarm Browser
Configuration Frequency Offset Sync Injection
Status Display Time Offset Fault Tracer
Integrated solution leveraging network performance data
13 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

14. SyncjackTM Assurance
• Operates continuously without need for PRC
traceability
• Offset signal injection for frequency and time control
Offset SyncjackTM Offset SyncjackTM
PRC
DPLL DPLL
APLL APLL
Correlation of information from both data and timing domain
14 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

15. In Essence
RAN synchronization has many dimensions to consider
Delivery is already a challenge
Assurance is an important additional component
Legacy and future needs have to be considered on top
15 © 2012 ADVA Optical Networking. All rights reserved. Confidential.

16. Thank You
mritter@advaoptical.com
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