Timing Excellence for Mobile Backhaul Networks at Broadband World Forum

Dr. Michael Ritter

October 17th, 2012

Timing Excellence for Mobile Backhaul Networks

© 2012 ADVA Optical Networking. All rights reserved. Confidential. 2 2

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• More than 15 years of innovation

Our Markets

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Our Leadership

• #1 in Ethernet Access Devices and #4 in Metro WDM


Our Solutions

Ethernet Access Metro

Optical Access

Enterprise

Core


Evolution of the Mobile Network

Usage patterns have changed in many dimensions

More Users

Faster Speeds

More Video

More Connections


Carrier Ethernet Backhaul

Departing from TDM interrupts timing distribution

Economic

Solution

Quality of Service Differentiation

Scalable

Technology

Multi-Point Capability


Frequency Distribution Is a Must

Synchronization must now be engineered into the network

Frequency Synchronization

• Avoid interference between adjacent cells

• Soft handover for wireless mobility

• Required by all air interface types

• Stability of 50pbb or better required

A

B

TA=1/fA

TB=1/fB

fA = fB


Precise Time Alignment Becomes Key

High-quality synchronization required at all cell sites

• Time Division Duplex (TDD) modes

• Coordinated Multi-Point (CoMP) transmission

• Essential for LTE Advanced

• Inter-cell phase of less than ± 3µs


Timing Distribution Alternatives

Tomorrow’s challenges need to be addressed today

RAN synchronization is not trivial

• Synchronous Ethernet vs. 1588v2

• Likely combination of both

• Underlying infrastructure needs to be capable

Assured delivery

• Availability

• Quality

• Robustness

Transparent Clock

Wander

Jitter

Frequency

Time of Day

Boundary Clock

Assurance


Control plane separation and X2 interface

• Departure from the traditional hub-and-spoke architecture

• Deeper backhaul network compared to 2G

Challenges

• Network size

• Complexity

• Latency & jitter

• Technology

3GPP LTE Architecture

Synchronization network needs to be planned carefully

UE eNodeB SGW PDN GW Internet

MME HSS/PCRF

PDN GATEWAY

X2

S1-C

S1-C

S1-U

S1-U

S11

S6a

S5/S8

Gxc

SGi

S7/Gx


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

• Carrier Ethernet

• OTN/WDM

• IP/MPLS

Active and passive participation in timing distribution

OTN/WDM Copper

Fiber

Microwave

Carrier Ethernet

IP/MPLS


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

• Not so much femto cells

Synchronization network will grow significantly

Macro Cell

Small Cells

Femto Cells

Evolved Packet Core

PDN GATEWAY


Multi-Operator Environment

Cell Site Mobile Core

UNI UNI

Mobile Network Operator

Mobile Network Operator

Access and Backhaul Network Operator

Characteristics of data and timing service defined at the UNI

Backhaul Network


Managing Synchronization Networks

Integrated solution leveraging network performance data

Tools and Procedures

Accuracy Measurement

Network View

Alarm Browser

Sync Injection

Fault Tracer

Topology Map

Configuration

Status Display

Stability Monitor

Frequency Offset

Time Offset


SyncjackTM Assurance

• Operates continuously without need for PRC traceability

• Offset signal injection for frequency and time control

PRC

Correlation of information from both data and timing domain

Offset

DPLL

APLL

SyncjackTM Offset

DPLL

APLL

SyncjackTM


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

[email protected]

Thank You

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Timing Excellence for Mobile Backhaul Networks at Broadband World Forum

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