This SON tutorial is part of the 3GPP Self-Organizing Networks series (#3GPPSONSeries). In this part we will look at SON Management in Heterogeneous Networks (HetNets), including Enhanced ICIC (eICIC) and Further Enhanced ICIC (FeICIC) All our #3G4G5G slides and videos are available at: Videos: https://www.youtube.com/3G4G5G Slides: https://www.slideshare.net/3G4GLtd SON Page: https://www.3g4g.co.uk/SON/ 5G Page: https://www.3g4g.co.uk/5G/ Free Training Videos: https://www.3g4g.co.uk/Training/

1. 3GPP SON Series:
SON Management in HetNets and
Enhanced ICIC (eICIC)
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2. Inter-Cell Interference Coordination (ICIC) Recap
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The goal of Inter-Cell Interference Coordination (ICIC) is to ensure there is no interference in overlapping areas between cells

3. Heterogeneous Network (HetNet) Recap
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Macrocell
Layer 1
Macrocell
Layer 2
Macrocell
Layer 3
Picocell
Microcell
Femtocell

4. ©3G4G
Macro cell
(pink border)
Small cells
(yellow border)

5. HetNet with Macrocell and Small Cells
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6. HetNet with Macrocell and Small Cells
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Interference zone

7. ©3G4G
Macro cell
(pink border)
Small cells
(yellow border)
Aggressor Cell
Victim Cell

8. Carrier Aggregation CA)
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9. Almost Blank Subframe (ABS)
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• Aggressor cell silences for some time
• To provide protected resources to victim cell
• Still PSS, SSS, PRS, CSI-RI, SIB1, Paging transmitted for backward compatibility, so called it
“Almost”
• Victim cell makes use of the silence time
• For eNB of victim cell to schedule UEs in victim cell
• For UE in victim cell to check its’ serving cell radio condition
• For UE in victim cell to measure it’s serving cell
• For UE in another cell to measure victim cell
0 1 0 1 1 0 0 0 1 0
subframe
ABS ABS ABS ABS
Aggressor Cell
TX power

10. X2-AP Load Indication
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X2-AP: Load Information
eNB 1 eNB 2

11. Non-CA based Enhanced ICIC (eICIC)
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ABS ABS ABS ABS
0 1 0 1 1 0 0 0 1 0
Aggressor
cell Tx
Power
Subframe
UE #C
UE #B
UE #A
Picocell
(Victim)
Macrocell
(Aggressor)
X2
(ABS Info)
Cell Range
Expansion (CRE)
Source: eXplanoTech

12. CA based Enhanced ICIC (eICIC)
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PDCCH
UE #B
Control signal on F1
Data signal on both
PDSCH
PDSCH
PDCCH
UE #A
Control signal on F2
Data signal on both
PDSCH
PDSCH
UE #A
UE #B
F1
F2
X2
(ABS Info)
UE#A and UE#B are Cross-Carrier Scheduled (CCS)
Source: eXplanoTech

13. Non-CA based Further enhanced ICIC (FeICIC)
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• At the transmitter side in DL
• Combination of ABS + power reduction (RP-ABS)
• At the receiver side in DL
• Use of advanced UE receiver (cancellation/discard of known
signals such as CRS…)
Source: Frank Rayal, See Reference [2]

14. References and Further Reading
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• Netmanias: Interference Coordination in LTE/LTE-A (2): eICIC (enhanced
ICIC) (link)
• Frank Rayal: Further Enhanced ICIC (FeICIC) by Faris Alfarhan (link)
• All about Wired and Wireless Technology: ICIC and eICIC by Adnan Basir
(link)
• From 4G to 5G: Self-organized Network Management meets Machine
Learning by Jessica Moysen and Lorenza Giupponi (link)
• 3G4G: Self-Organizing Networks / Self-Optimizing Networks (link)
• The 3G4G Blog: SON (link)

15. Thank You
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