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Power Matters Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary.

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Page 1: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

Delivering Time and Phase for LTE Networks

Simon Butcher

©2016 Microsemi Corporation. Company Proprietary.

Page 2: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

Small Cell Deployments - AndLTE-Advanced (LTE-A) at the Mobile Edge

LTE-FDD requires frequency sync

LTE-TDD requires phase sync to UTC

LTE-A Can be deployed on LTE-FDD or TDD networks

LTE-A services are designed to

– enhance network RF performance,

– Improve spectrum availability and reach,

– Avoid interference between the eNB,

– Enable more users onto the network,

– Dynamically allocate bandwidth etc

Most LTE-A services such as eICIC, CoMP, eMBMS,

MBSFN require inter cell phase sync

Page 3: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

Mobile Wireless Synchronization Requirements

Mobile RFInput into Base

StationInter Cell Alignment

50ppb16 ppbGSM, WCDMA

LTE-FDD

LTE-TDD

LTE-Ae.g. CoMP, eICIC, eMBMS, MBSFN

± 1.1µs

50ppb

± 1.5µs (phase)

Not all LTE-A functions require phase,

Carrier Aggregation for example does not

Page 4: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

ITU-T Synchronization Standards

G.8261 Timing & Sync: Frequency G.8271 Timing & Sync: Time & Phase

G.8261.1 Network Limits: Frequency G.8271.1 Network Limits: Full On Path Support

G.8271.2Network Limits : Partial On Path

Support

G.8262 SyncE clock – EEC G.8272 Primary Time Reference Clock -PRTC

G.8263PTP Clocks: Frequency

(PEC)G.8273

PTP Clocks: Time & Phase

(T-BC, T-TC, T-SC)

G.8273.4 Assisted Partial Time Support

G.8265 Architecture: Frequency G.8275 Architecture: Time & Phase

G.8265.1 Telecom Profile G.8275.1 Time Profile : Full On path support

G,8275.2 Time Profile : Partial On Path Support

Basic

aspects

Network

Limits

Clocks

Methods

Profiles

Frequency Time/Phase

not yet consentedconsented consented

Page 5: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

PTP Delivery

AG1

PRC

PTP GM

PTP GM

End Equipment

PTP Timing Flows

AG1Aggregation

router

Packet Network Timing System

PTP Slave

GPON OLT

Edge Router

Microwave

PTP Slave

PTP Slave

PTP Slave

Base Station

Asymmetric Data Path

Page 6: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

Time/Phase : The Time Error Budget

±100 ns

Transport, Noise, & Network Asymmetry eNB

PRTC

± 400 nsec± 1000 nsec

SOURCE

OF TIME

USE OF TIME

& Holdover

Total eNB Inter Cell Time Error +/- 1.5 µsec from UTC

Network Error Budget +/- 1 µsec

GPS

TRANSPORT OF TIME

PRC

Page 7: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

G.8275.1 Time Profile: Full On Path Support

Attributes

• PTP Multicast over Layer 2 network

• “Time Boundary Clock” (T-BC) on every network element

• Physical layer frequency support from syncE (needs a PRC)

• Max Hops: 10 (20 is currently theoretical)

• Provides “hop by hop” engineering guideline for time/phase as per SEC/EEC

PRC

GM

End Equipment

Time Slave

Clock

T-SCPRTC

GNSS

Packet Network with

Embedded Boundary Clocks

T-BC T-BC T-BC T-BC

Page 8: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

G.8275.2 Time Profile: Partial On Path Support

• In G.8275.2 we place a Boundary Clock at the most effective point on the

transport path

• Boundary Clocks cannot remove Asymmetry .. They can only reduce it.

PRC

GM

End Equipment

Time Slave

Clock

T-SCPRTC

GNSS

BC

Unicast Segment 1 Unicast Segment 2

Asynchronous Packet Network

Page 9: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

Removing Asymmetry G.8273.4 Assisted Partial Timing Support (APTS)

GPS to calibrate out PTP asymmetry, and to measure its performance

Provides Holdover in the event of Local GPS failure.

PRC

Frequency ref

End Equipment

Time Slave

Clock

T-SCPRTC

GNSS

Asynchronous Packet Network

Unicast Segment 1 Unicast Segment 2

PRTC

APTS Node

Page 10: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

The Time Error Budget with APTS and Asymmetry Compensation

±100 nsPRTC

dynamictime error

Holdover etc

±50ns

Total Time Error Budget +/- 1.5 µsec

Network Equipment End systems

Slave Clock

±800 ns Constant time error

Transport Network Base Station budget

network asymmetry is calibrated out of the system using GPS

±200 ns ±350 ns

Page 11: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

G.8275.2 + APTS with Asymmetry Compensation with Unicast or Multicast at Edge

Packet Network

PRTCGrandmaster

PTP FLOWS

End Equipment (Base stations)

unicast or multicast mode

ASYMMETRY

CALIBRATION

T-SC

APTS PRTC

T-SC

unicast mode

Mobile Edge

PRTC

PRTC

Page 12: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters.™ 12© 2014 Microsemi Corporation. COMPANY PROPRIETARY

Key Synchronization Requirements

Small Cells require accurate timing

Timing is dependent on GNSS

Critical Problems

Challenges for Small Cell Deployment

High Cost of GPS antenna cabling

Roof access/rental fees

Installation Costs through several

floors

Operators requesting less

devices to deploy and manage –

combining functions into single

device NIDSwitch

GPS Antenna

Page 13: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters.™ 13© 2014 Microsemi Corporation. COMPANY PROPRIETARY

MSCC iGM – Indoor Use

Device Features • Integrated GPS receiver +

Antenna + PTP Grand Master

GPS Features• Enhanced Indoor GNSS Assist

• Optimized for urban canyon /

indoor use

SyncE / PTP Features

APTS Support

Page 14: Delivering Time and Phase for LTE Networks...2016/04/27  · Delivering Time and Phase for LTE Networks Simon Butcher ©2016 Microsemi Corporation. Company Proprietary. Power Matters

Power Matters

Thank You

Simon Butcher

Solutions Architect – EMEA

Microsemi

[email protected]