the cto's espresso guide to son
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Mindspeed Technologies Mobile World Congress Feb 27 - March 1, 2012
The “Espresso GUIDE” TO SON
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Introductions
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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