1. Synchronization Architecture for
3G and 4G Networks
Manish Gupta
Manish Gupta
Vice President, Marketing & Business Development
Symmetricom
y
October 10, 2012
Confidential © Copyright 2012

2. Symmetricom Introduction
Undisputed global leader of highly-precise timekeeping
technology, instruments and solutions
• Headquarters in San Jose, California
• Publicly traded on NASDAQ (SYMM)
• Incumbency with major customers in
over 100 countries
• Global resellers: Ericsson, NSN, ALU
• Partner in Brazil: Arsitec Technologies
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3. Our Global Customers
Communications Government
Power Utility Enterprise
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4. Trend #1: Explosive LTE Growth
over 3M LTE outdoor eNodeBs will be deployed by 2015
2,500,000
LTE Macro Stations Metro Small Cells
2,000,000 (cumulative units) 250mW to 5W
(cumulative units)
(cumulative units)
1,500,000
TDD‐LTE
1,000,000 FDD‐LTE
500,000
‐
Source: EJL 2011 A 2012 E 2013 E 2014 E 2015 E
1,200,000
1 200 000
Metro Small Cells
1,000,000 5W to 10W
800,000
(cumulative units)
600,000 TDD‐LTE
FDD‐LTE
400,000
200,000
200 000
‐
2011 A 2012 E 2013 E 2014 E 2015 E
Source: EJL Source: Heavy Reading
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5. Trend #2: Ethernet drives multi‐sync in MBH
multi‐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
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6. Mobile Synchronization Specifications
Frequency:
Application Phase
Physical / Air Interface
UMTS/LTE FDD Residential small cell NA / 100 ‐ 250 ppb NA
GSM / UMTS / W‐CDMA NA
CDMA2000 ± 3 to 10 µs
TD‐SCDMA ± 1.5 µs
LTE ‐FDD NA
16 ppb / 50 ppb
LTE ‐TDD ± 1.5 µs
LTE‐A MBSFN ± 1 to 32 µs
LTE‐A Hetnet Coordination (ICIC) ± 5 µs
LTE‐A CoMP (Network MIMO) ± 0.5 µs
WiMAX (TDD) ± 1 to 8 µs
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7. Why is Synchronization Required?
Why You Need Impact of
Application
pp
to Comply
t C l Non‐compliance
N li
Call Interference
LTE (FDD) Call Initiation
Dropped calls
Packet loss/collisions
LTE (TDD) Time slot alignment
Spectral efficiency
Proper time alignment
alignment
of video signal Video broadcast
LTE MBSFN
decoding interruption
from multiple BTSs
Coordination of signals Poor signal quality
LTE A MIMO/COMP
LTE‐A MIMO/COMP to/from multiple
to/from multiple at edge of cells, LBS
at edge of cells LBS
base stations accuracy
LTE‐A eICIC Interference Spectral inefficiency &
coordination Service degradation
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8. Synchronization Architecture for 2G / 3G
SDH (E1 or CES) Frequency Macro
Backhaul
Backhaul Synchronization Cells
Management
Primary Reference Distribution Base Stations
Macro Cell
CORE AGGREGATION ACCESS
GPS / Cesium PRS and Sync Supply Unit driven E1/T1 distribution
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9. Synchronization Architecture for
4G / LTE‐FDD
Ethernet Frequency Macro Cells
Backhaul
Backhaul Synchronization Small Cells
Small Cells
Management
Primary Reference Distribution Base Stations
Macro Cell
Metro
Small Cells
Residential and
Enterprise Small Cells
CORE AGGREGATION ACCESS
GPS/Cesium PRS and PTP distribution from SSU or stand‐alone Grand
Master to Macro Cells
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10. Synchronization Architectures for
4G / LTE‐TDD, LTE‐Advanced
Ethernet Frequency & Phase Macro Cells
Backhaul
Backhaul Synchronization Small Cells
Small Cells
Management
Primary Reference Distribution Base Stations
Macro Cell
BC BC BC BC BC BC
Metro
SyncE SyncE SyncE SyncE SyncE SyncE
Small Cells
Residential and
Enterprise Small Cells
CORE AGGREGATION ACCESS
GPS/Cesium PRS and PTP distribution Option #1:
BC in every network element
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11. Synchronization Architectures for
4G / LTE‐TDD, LTE‐Advanced
Ethernet Frequency & Phase Macro Cells
Backhaul
Backhaul Synchronization Small Cells
Small Cells
Management
Primary Reference Distribution Base Stations
Macro Cell
Metro
Small Cells
Residential and
Enterprise Small Cells
CORE AGGREGATION ACCESS
Option #2:
GPS/Cesium PRS and PTP distribution
PTP master “at the edge”
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12. Small Cell Synchronization Scenarios
Core / Access Small Cells
Aggregation
Microwave/
IEEE 1588 (PTP) E‐Band//WiMAX
GPS Fiber
Metro
IEEE 1588 (PTP)
Network Time
Protocol (NTP) IEEE 1588 (PTP)
Fiber
softGPS
PTP or NTP EoC
NTP Enterprise
NTP
Cable
softGPS
DSL
Residential
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13. Synchronization Technology Options
PTP 1588v2 SyncE NTP GPS
Frequency & Phase
q y Frequency Only
q y y Frequency Only
q y y Frequency & Phase
q y
Layer 2 and 3 Physical Layer Layer 3 Physical Layer
Cost & Location
Flexible Deployment Greenfield Deployments Limited Small Cell only
challenges
IEEE 1588, ITU‐T G.8261
G.8271 and G.8271.1
d IETF RFC 1305, RFC
IETF RFC 1305 RFC
ITU‐T G.8261 / 2 / 4 ITU‐T G.811
G.8265.1, G.8275.1 5905‐8
(pre)
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14. Synchronization Solutions for ALL networks
TimePictra
Sync Mgmt System
Management
GPS
TimeProvider 500
TimeProvider 500
SSU 2000
TimeProvider 5000
TimeCesium TimeProvider 5000 “edge configuration” Rubidium Soft Clocks
Primary Reference Distribution Base Stations
Macro Cell
Metro
Small Cells
Residential and
R id ti l d
Enterprise Small Cells
CORE AGGREGATION ACCESS
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15. Ensuring Interoperability
SyncWorld® Ecosystem Program
Symmetricom has established the SyncWorld® Ecosystem Program to promote interoperability
among the vendors who will deliver on service providers’ advanced networking requirements.
Network Equipment
q p Silicon
Microwave Backhaul Test and Measurement
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16. Synchronization Recommendations
support all LTE services
1. Deploy GPS at select locations only
2. Deploy PTP (1588 v2) everywhere
Deploy PTP (1588 v2) everywhere
3. Ask for Rubidium atomic clocks in
Macro eNodeB for LTD‐A, LTE‐TDD
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