the cto's espresso guide to son

Nasdaq: MSPD

Mindspeed Technologies Mobile World Congress Feb 27 - March 1, 2012

The “Espresso GUIDE” TO SON

Nasdaq: MSPD

Introductions

Nasdaq: MSPD

Agenda

What is SON?

Why do we need SON?

How? SON implementation

A deeper dive : SON techniques for Interference Management

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WHAT and Why?

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What is SON?

eNB power on

(or cable connected)

(A) Basic Setup

(B) Initial Radio

Configuration

(C) Optimization /

Adaptation

a-1 : configuration of IP address

and detection of OAM

a-2 : authentication of eNB/NW

a-3 : association to aGW

a-4 : downloading of eNB software

(and operational parameters)

b-2 : coverage/capacity related

parameter configuration

b-1 : neighbour list configuration

c-1 : neighbour list optimisation

c-2 : coverage and capacity control

Self-Configuration

(pre-operational state)

Self-Optimisation

(operational state)

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Why do we need SON?

Plan Deploy Optimise Maintain

Self Configuration Reduces CAPEX Self Optimisation and Energy

Saving Reduces OPEX

Self Optimisation and Self Healing Improves User Experience

“About 24 % of a typical wireless

operator’s revenue goes to network

OPEX”

“About 17 % of wireless operator’s

CAPEX is spent on engineering and

installation services”

“SON will improve the operational

efficiency by >60%”

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A new problem…

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The reality of the macro network

Source: Arthur D Little

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So femtocells… and they “SON”

plug-in and turn on

connects through broadband

ipsec tunnel established to carrier

remote management

listens to network environment

Adjusts and adapts: power levels; carrier; codes

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Femtocell SON/RRM Development

Deployment Modelling

FAP

Femto Forum Recommendations

3GPP H(e)NB Recommendations

System Test and

Verification

IOT and Carrier Integration

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Measurements, Interfaces, Architectures

Implementing son

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Network

Element

Mgmt

Layer

Macro NE Layer

OSS Layer Home NEM and NE

General 3GPP OAM scenario layout

SON: Centralised, Distributed or Hybrid?

HeNB HeNB

Femto GW

NEM Supplier A

NEM Supplier A

NEM Supplier A

eNB Supplier B

Umbrella Systems

NEM Supplier A

NEM Supplier B

eNB Supplier B

eNB Supplier A

eNB Supplier A

ltf-N

ltf-P2P

X2

Only these two are standardised: the rest are vendor-specific

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Categories of SON functionality

Stand-alone use cases

Admission Control, Automatic Generation of Default Parameters, Load Balancing, Handover optimisation

Integration use cases

Load Balancing AND Handover optimisation

SON coordination

an overall framework for the coordination between use cases.

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Measurements Types

Counters

Key Performance Indicator (KPI)

Alarms

Timers

Measurements

Statistics

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Measurement Sources and Targets

Affected eNodeB: the eNodeB which is affected by the SON use case

Neighbouring eNodeB: eNodeBs that are neighbours of the affected eNodeB, e.g.

those with a handover relationship

UE served by the affected eNodeB

UE served by neighbour cells that still receives and decodes information from the affected eNodeB

The access gateway(s) (aGW) to which the eNodeB is connected

The OAM fault management system: Alarms

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Interference Mitigation

KEEP the noise down!

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Deployment Considerations

Femto UE Femto AP

Shared or Dedicated carrier Neighbour

macrocell

Macro UE

Open, Closed or Hybrid Access

“Hybrid” access added in Rel-9 – allows all

UEs access the femto but gives priority

(higher QoS, etc) to those in the “Closed

Subscriber Group”

Femto can be on a dedicated

carrier frequency or co-channel

with macro layer.

Separation between Femto AP

and macrocell

Indoors or outdoors

Indoors or outdoors

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An interference scenario

UE Registered in HeNB is radiating at a power level that can be received by the Macro eNodeB

This is received as noise by Macro eNodeB and makes it more difficult to listen to the UEs camping on it

Depending on the interference level, Macro eNodeB would tell UEs to raise their power levels

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Key interference scenarios (3GPP)

1

2

3

4 6

5

Attached

BS Victim

UE Victim

Aggressor Victim

1 UE attached to Home eNode B Macro eNode B

2 Home eNode B UE attached to Macro eNode B

3 UE attached to Macro eNode B Home eNode B

4 Macro eNode B UE attached to Home eNode B

5 UE attached to Home eNode B Home eNode B

6 Home eNode B UE attached to Home eNode B

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System Modelling

Femto houses , apartments and enterprise offices

dropped within macro coverage area

house

Max UE area

Max femto BS area

10 m

10 m

10 m

10 m

10 m

2 apartment “stripes” with multiple floors

house

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Indoor Wireless Modelling

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Discovering the world around you

UE measurements

LTE provides significant improvements (MDT)

Continuous Network Monitor

UE receive chain regular scans for surrounding base stations

Detection of Victim UEs

Continuous monitoring for UE transmission to other basestations

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Victim UE Detection (BEFORE)

Femto UE Femto AP

Macro Deadzone

Macro DL SINR < threshold

Neighbour

macrocell

S I

S I

“Victim” Macro UE

Transmit

Power

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Victim UE Detection (SON!)

Femto UE Femto AP

Macro Deadzone

Macro DL SINR < threshold

Neighbour

macrocell

S I

S I

“Victim” Macro UE

Transmit

Power

Uplink

Transmissions

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Victim UE Detection (AFTER)

Femto UE Femto AP

Macro Deadzone

Macro DL SINR < threshold

Neighbour

macrocell

S I

S I

“Victim” Macro UE

Transmit

Power

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Summary

SON is an essential component of any new network rollout

Small cells are an essential component of any new network rollout

High scalability SON is a MUST!

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Understand Carriers Problems & Solutions

metres

metr

es

Received signal strength for Bath Macro + metro

150 200 250 300 350 400

600

650

500

450

400

350

300

250

200

-100

-80

-60

-40

-20

0

20

Carriers will talk if you are sharing interesting information

dBm

HetNet Coverage and Capacity Scenario Handover/SHO and Hierarchical Cell Behaviour

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Mindspeed Technologies

Mobile World Congress 2012

The “Espresso GUIDE” to SON