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The 2 definitions of Heterogeneous Networks (HetNets)
The document discusses two definitions of heterogeneous networks (HetNets). The first definition describes a HetNet as a network with a hierarchical structure containing different types of cells like macrocells, picocells, and femtocells that operate on the same or different frequencies. The second part of the document discusses interference coordination techniques for HetNets like enhanced inter-cell interference coordination (eICIC) which uses mechanisms like almost blank subframes (ABS) to mitigate interference between macrocells and small cells. It also presents further enhanced ICIC (FeICIC) techniques that combine ABS with power control and advanced receiver capabilities.
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The 2 definitions of Heterogeneous Networks (HetNets)
- 1. The 2 definitionsof Heterogeneous Networks (HetNets) @3g4gUK
- 2. Mobile Towers inTheory ©3G4G
- 3. Mobile Towers inTheory ©3G4G
- 4. Mobile Towers inPractice ©3G4G
- 5.
- 6. Homogeneous Network ©3G4G Hierarchical CellStructures (HCS)
- 7.
- 8. Heterogeneous Network (HetNet)– Defn #1 ©3G4G Macrocell Layer 1 Macrocell Layer 2 Macrocell Layer 3 Picocell Microcell Femtocell
- 9. Source: Cisco presentationfrom LTEWS 2013 ©3G4G
- 10. Source: Cisco presentationfrom LTEWS 2013 ©3G4G
- 11. Source: Cisco presentationfrom LTEWS 2013 ©3G4G
- 12. Source: Cisco presentationfrom LTEWS 2013 ©3G4G
- 13. Hierarchically Structured Network I prefer touse this term rather than calling them HetNets. Note that in Hierarchical Cell Structures (HCS), each layer has a different frequency ©3G4G
- 14. The ‘LTE’ conceptof HetNet ©3G4G ✓ X✓
- 15. The ‘LTE’ conceptof HetNet ©3G4G ✓ X✓
- 16. The ‘LTE’ conceptof HetNet ©3G4G ✓✓ ✓
- 17. The ‘LTE’ conceptof HetNet ©3G4G ✓✓ ✓ ?? Aggressor Cell Victim Cell
- 18. Non-CA based EnhancedICIC (eICIC) ©3G4G 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
- 19. CA based EnhancedICIC (eICIC) ©3G4G 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
- 20. Non-CA based Furtherenhanced ICIC (FeICIC) ©3G4G • At the transmitter side in DL • Combination of ABS + power reduction • At the receiver side in DL • Use of advanced UE receiver (cancellation/discard of known signals such as CRS…) Picture Source: Frank Rayal
- 21. References for furtherstudy ©3G4G • 3GPP: HetNet/Small Cells • eXplanoTech: Heterogeneous Networks (HetNets) • Frank Rayal: Further Enhanced ICIC (FeICIC) • Netmanias: Interference Coordination in LTE/LTE-A (2): eICIC (enhanced ICIC)
- 22. Thank You To learnmore, visit: 3G4G Website – http://www.3g4g.co.uk/ 3G4G Blog – http://blog.3g4g.co.uk/ 3G4G Small Cells Blog – http://smallcells.3g4g.co.uk/ Operator Watch - http://operatorwatch.3g4g.co.uk/ Follow us on Twitter: https://twitter.com/3g4gUK Follow us on Facebook: https://www.facebook.com/3g4gUK/ Follow us on Linkedin: https://www.linkedin.com/company/3g4g Follow us on Slideshare: https://www.slideshare.net/3G4GLtd Follow us on Youtube: https://www.youtube.com/3G4G5G Follow us on Storify: https://storify.com/3g4gUK ©3G4G