Synchronization Architecture for 3G and 4G Networks

Synchronization Architecture for 3G and 4G Networks

Manish GuptaManish GuptaVice President, Marketing & Business DevelopmentSymmetricom

Confidential © Copyright 2012

yOctober 10, 2012

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2Confidential © Copyright 2012

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Our Global Customers

GovernmentCommunications

EnterprisePower Utility


Trend #1: Explosive LTE Growthover 3M LTE outdoor eNodeBs will be deployed by 2015

Metro Small Cells 250mW to 5W

(cumulative units)2,000,000

2,500,000 LTE Macro Stations(cumulative units)

(cumulative units)

1,000,000

1,500,000

TDD‐LTE

FDD‐LTE

‐

500,000

2011 A 2012 E 2013 E 2014 E 2015 ESource: EJL

1 200 000

800,000

1,000,000

1,200,000 Metro Small Cells5W to 10W

(cumulative units)

200 000

400,000

600,000 TDD‐LTE

FDD‐LTE

4Confidential © Copyright 2012Source: Heavy ReadingSource: EJL

‐

200,000

2011 A 2012 E 2013 E 2014 E 2015 E

Trend #2: Ethernet drives multi‐sync in MBHmulti‐sync MBH, 90% to run Carrier Ethernet by 2016

Source: Infonetics, June 2011 & Mobile Experts Oct 2011


Source: Heavy Reading July 2011 Source: Heavy Reading, June 2012

Mobile Synchronization Specifications

Application PhaseFrequency: Physical / Air Interface

GSM / UMTS / W‐CDMA NA

UMTS/LTE FDD Residential small cell NA / 100 ‐ 250 ppb NA

CDMA2000

TD‐SCDMA

± 3 to 10 µs

± 1.5 µs

LTE ‐FDD

LTE ‐TDD

NA ± 1.5 µs

16 ppb / 50 ppb

LTE‐A MBSFN

LTE‐A Hetnet Coordination (ICIC)

LTE‐A CoMP (Network MIMO)

± 1 to 32 µs± 5 µs± 0.5 µs


WiMAX (TDD) ± 1 to 8 µs

Why is Synchronization Required?

Application Why You Need t C l

Impact ofN lipp to Comply Non‐compliance

Call Initiation Call Interference Dropped callsLTE (FDD)

Time slot alignment

Proper time alignment

Packet loss/collisionsSpectral efficiencyLTE (TDD)

Proper time alignment of video signal

decoding from multiple BTSs

Coordination of signalsto/from multiple

Video broadcast interruption

Poor signal quality at edge of cells LBS

LTE MBSFN

LTE‐A MIMO/COMP to/from multiple base stations

Interference coordination

at edge of cells, LBS accuracy

Spectral inefficiency &Service degradation

LTE A MIMO/COMP

LTE‐A eICIC


Synchronization Architecture for 2G / 3G

SDH (E1 or CES) Backhaul

FrequencySynchronization

MacroCells

Management

Backhaul Synchronization Cells

Macro Cell

Primary Reference Base StationsDistribution

CORE ACCESSAGGREGATION


GPS / Cesium PRS and Sync Supply Unit driven E1/T1 distribution

Synchronization Architecture for 4G / LTE‐FDD

EthernetBackhaul

FrequencySynchronization

Macro CellsSmall CellsBackhaul Synchronization Small Cells

Management


Macro Cell

Metro Small Cells


Residential andEnterprise Small Cells


GPS/Cesium PRS and PTP distribution from SSU or stand‐alone Grand Master to Macro Cells

Synchronization Architectures for 4G / LTE‐TDD, LTE‐Advanced

EthernetBackhaul

Frequency & PhaseSynchronization

Macro CellsSmall Cells

Management

Backhaul Synchronization Small Cells


BCSyncE

BCSyncE

BCSyncE

BCSyncE

BCSyncE

BCSyncE

Macro Cell

Metro


SyncE SyncESyncE SyncE SyncE SyncE


Small Cells


Option #1: BC in every network element

GPS/Cesium PRS and PTP distribution

Synchronization Architectures for 4G / LTE‐TDD, LTE‐Advanced

EthernetBackhaul

Frequency & PhaseSynchronization

Macro CellsSmall Cells

Management

Backhaul Synchronization Small Cells


Macro Cell

Metro



Small Cells


Option #2: PTP master “at the edge”

GPS/Cesium PRS and PTP distribution

Small Cell Synchronization Scenarios

Core / Aggregation

Small CellsAccessAggregation

Microwave/ E‐Band//WiMAX

Fiber

IEEE 1588 (PTP)

GPS

MetroIEEE 1588 (PTP)

FiberGPS

Enterprise

Network Time Protocol (NTP) IEEE 1588 (PTP)

softGPSFiber

EoCNTP

PTP or NTP

NTP

softGPSCable


ResidentialsoftGPS

DSL

Synchronization Technology Options

SyncEPTP 1588v2 NTP GPS

Frequency & Phase Frequency Only Frequency Only Frequency & Phaseq y

Layer 2 and 3

q y y

Physical Layer

q y y

Layer 3

q y

Physical Layer

Flexible Deployment

IEEE 1588, ITU‐T G.8261d

Greenfield Deployments Limited Small Cell only

IETF RFC 1305 RFC

Cost & Location challenges

G.8271 and G.8271.1 G.8265.1, G.8275.1

(pre)

ITU‐T G.8261 / 2 / 4 IETF RFC 1305, RFC 5905‐8 ITU‐T G.811


Synchronization Solutions for ALL networks

TimePictraSync Mgmt System

TimeProvider 500GPS

Management

Soft ClocksTimeCesium TimeProvider 5000

SSU 2000TimeProvider 500

TimeProvider 5000“edge configuration” Rubidium


Macro Cell

R id ti l d

Metro Small Cells




Ensuring InteroperabilitySyncWorld® Ecosystem Program

Symmetricom has established the SyncWorld® Ecosystem Program to promote interoperability among the vendors who will deliver on service providers’ advanced networking requirements.Symmetricom has established the SyncWorld® Ecosystem Program to promote interoperability among the vendors who will deliver on service providers’ advanced networking requirements.

Network Equipment Silicon


q p

Test and MeasurementMicrowave Backhaul

Synchronization Recommendationssupport all LTE services

1. Deploy GPS at select locations only

2. Deploy PTP (1588 v2) everywhere2. Deploy PTP (1588 v2) everywhere

3. Ask for Rubidium atomic clocks in Macro eNodeB for LTD‐A, LTE‐TDD
