Self-Organizing Radio Resource Management and Backhaul Dimensioning for Cellular Networks

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School of Science | Doctoral thesis (article-based) | Defence date: 2014-08-08
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Aalto University publication series DOCTORAL DISSERTATIONS, 107/2014
The huge appetite for mobile broadband has resulted to continuous and complementary improvement in both radio access technology and mobile backhaul of cellular networks, along with network densification. Femtocells are foreseen to complement traditional macro base stations (BSs) in Long Term Evolution (LTE) and future cellular networks.  Deployment of femtocells, introduce new requirements for distributing phase synchronization and interference management in heterogeneous network. Achieving phase synchronization for indoor femtocells will be beneficial for time division duplexing (TDD) operation and inter-cell interference cancellation and management techniques, but challenging to achieve as global positioning system does not work indoors. In this thesis, we propose coordinated transmission and reception algorithms to reduce interference across BSs, and thereby achieve better network-wide phase synchronization over the air. We also cover the problem of selecting component carriers for dense small cell network, by improving the throughput of cell-edge user equipment's (UEs). We propose three strategies: Selfish, Altruistic and Symmetric for primary carrier selection and remove the outage of the macro UEs near the closed subscriber group (CSG) femtocells. Further, we propose dynamic frequency selection algorithm for component carrier selection, where decisions to select or drop a carrier are based on gain/loss predictions made from UE handover measurements. Thereby, we maximize the sum utility of the dense femtocell network, which includes mean-rate, weighted fair-rate, proportional fair-rate and max-min utility.  Mobile backhaul dimensioning is studied to improve the handover and provide the cost-effective backhaul opportunity for femtocells deployed in emerging markets. In a packet-switched wireless system e.g. LTE, data packets are needed to be efficiently forwarded between BSs during handover over the backhaul. We improve the packet forwarding handover mechanism by reducing the amount of forwarded data between BSs. Another challenge lies in equipping the femtocells with backhaul, where copper cable, optical fiber or microwave radio links are expensive options for unplanned emerging market case. We consider leveraging macro LTE networks to backhaul High Speed Packet Access femtocells, thereby highlight the possibilities for cost-effective capacity upgrades of dense settlements.
Supervising professor
Nurminen, Jukka K., Prof., Aalto University, Department of Computer Science and Engineering, Finland
Thesis advisor
Nurminen, Jukka K., Prof., Aalto University, Department of Computer Science and Engineering, Finland
self-organization, synchronization, interference, component carrier, handover, data forwarding, backhaul, heterogeneous network, femtocell, LTE, LTE-Advanced
Other note
  • [Publication 1]: Parth Amin; Olav Tirkkonen, “Network listening based synchronization techniques for femtocell systems,” in IEEE 22nd International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), Toronto, Canada, 11-14 Sept, 2011, pp.1–5.
    DOI: 10.1109/PIMRC.2011.6139863 View at publisher
  • [Publication 2]: Parth Amin; Vishnu Prasad Kaushik Ganesan; Olav Tirkkonen, “Bridging Interference Barriers in Self-Organized Synchronization," in Self-Adaptive and Self-Organizing Systems (SASO), 2012 IEEE Sixth International Conference on, Lyon, France, 10-14 Sept, 2012, pp.109–118.
    DOI: 10.1109/SASO.2012.30 View at publisher
  • [Publication 3]: Parth Amin; Olav Tirkkonen; Tero Henttonen; Esa Pernila, “Primary component carrier selection for a heterogeneous network: A comparison of Selfish, Altruistic and Symmetric Strategies," in IEEE Wireless Communications and Networking Conference Workshops (WCNCW), Paris, France, April 2012, pp.115–119.
    DOI: 10.1109/WCNCW.2012.6215472 View at publisher
  • [Publication 4]: Parth Amin; Olav Tirkkonen; Tero Henttonen; Esa Pernila, “Dynamic Frequency Selection based on Carrier Pricing between Cells," in IEEE 77th Vehicular Technology Conference (VTC Spring), Dresden, Germany, 2-5 June, 2013, pp.1–5.
    DOI: 10.1109/VTCSpring.2013.6692524 View at publisher
  • [Publication 5]: Parth Amin; Antti Ylä-Jääski, “Improved handover mechanisms to reduce packet forwarding in LTE-Advanced," in IEEE 9th International Wireless Communications and Mobile Computing Conference (IWCMC), Cagliari, Italy, 1-5 July, 2013, pp.831–836.
  • [Publication 6]: Parth Amin; Nadew Sikuwaru Kibret; Edward Mutafungwa; Beneyam B. Haile, Jyri Hämäläinen, Jukka K. Nurminen, “Performance Study for Off-Grid Self-Backhauled Small Cells in Dense Informal Settlements," in IEEE 25th International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), Washington DC, USA, 2-5 Sept, 2014, pp.1–6 (accepted for publication).