Backhaul Link Enhancement and Radio Resource Management for Relay Deployments
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School of Electrical Engineering |
Doctoral thesis (article-based)
| Defence date: 2013-06-14
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Authors
Date
2013
Major/Subject
Mcode
Degree programme
Language
en
Pages
111 + app. 146
Series
Aalto University publication series DOCTORAL DISSERTATIONS, 103/2013
Abstract
Mobile networks are experiencing a dramatic increase in the data traffic. Besides, a continuously growing number of users expect mobile broadband access with the utmost in quality and ubiquitous connectivity. In this regard, multi-hop decode-and-forward relaying is a promising enhancement to existing radio access networks to fulfill the challenging requirements in a cost-efficient way and, thus, is an integral part of the Fourth Generation (4G) standards. Nevertheless, in order to fully exploit the potential benefits of relay deployments, proper radio resource management (RRM) is necessary. The research in this thesis has contributed to cellular relay deployments for future mobile networks. Concretely, we have developed key RRM concepts with a particular focus on the uplink (UL) system performance to complement the existing literature. We have demonstrated the performance of these concepts by taking Third Generation Partnership Project (3GPP) Long-Term Evolution (LTE) Release 10 and beyond (LTE-Advanced) Type 1 inband relaying as a practical framework, and by considering urban and suburban scenarios. First, by performing relay site planning (RSP) we aim at improving the quality of the wireless backhaul which is crucial for the end-to-end user performance. Then, we analyze UL power control (PC) and verify its importance and applicability in relay deployments. In this context, we propose manual and automated optimizations to tune PC parameters on all links to further enhance the system performance. Moreover, we study the energy efficiency by taking into account throughput (TP) per power consumption. Further, we investigate various resource sharing strategies among and within the links. Via proposed approaches, performance enhancement is targeted along with higher system fairness and more flexible resource allocation. In addition, we address a key issue regarding the small coverage area of an RN cell in the overlaying macrocell, which results in load imbalances, inefficient resource utilization, and increased UL inter-cell interference. Specifically, we apply practical cell range extension (CRE) techniques to cope with these drawbacks. Performance evaluations reveal that relay deployments clearly outperform macrocell-only deployments in terms of TP as well as TP per power consumption provided that proper RRM is performed. Our results also verify that the use of RSP yields substantial improvements. Furthermore, our results show that the proposed RRM concepts and the associated joint optimization strategies can fulfill the aforementioned goals while achieving significant system performance enhancements.Description
Supervising professor
Hämäläinen, Jyri, Prof., Aalto University, FinlandThesis advisor
Redana, Simone, Dr., Nokia Siemens Networks, GermanyKeywords
decode-and-forward, inband relay, mobile networks, RRM, site planning
Other note
Parts
- [Publication 1]: O. Bulakci, S. Redana, B. Raaf, J. Hamalainen. Performance Enhancement in LTE-Advanced Relay Networks via Relay Site Planning. In IEEE Vehicular Technology Conference (VTC Spring 2010), Taipei, Taiwan, pp. 1-5, May 2010.
- [Publication 2]: O. Bulakci, A. Bou Saleh, J. Hamalainen, S. Redana. Performance Analysis of Relay Site Planning over Composite Fading/Shadowing Channels with Cochannel Interference. IEEE Transactions on Vehicular Technology (TVT), vol. 62, no. 4, pp. 1692-1706, May 2013.
- [Publication 3]: O. Bulakci, J. Hamalainen, A. Bou Saleh, S. Redana, B. Raaf. Impact of Preconditioning on the Convergence of Numerical Co-channel Interference Approximations in Heterogeneous Networks. In IEEE International Wireless Communications and Mobile Computing Conference (IWCMC 2011), Istanbul, Turkey, pp. 119-124, July 2011.
- [Publication 4]: O. Bulakci, S. Redana, B. Raaf, J. Hamalainen. Impact of Power Control Optimization on the System Performance of Relay based LTEAdvanced Heterogeneous Networks. Journal of Communications and Networks (JCN), Special Issue on Heterogeneous Networks, vol. 13, no. 4, pp. 345-359, August 2011.
- [Publication 5]: O. Bulakci, A. Awada, A. Bou Saleh, S. Redana, J. Hamalainen. Auto mated Uplink Power Control Optimization in LTE-Advanced Relay Networks. EURASIP Journal on Wireless Communications and Networking (WCN), [Highly Accessed] vol. 2013, no. 8, pp. 1-19, January 2013.
- [Publication 6]: A. Bou Saleh, O. Bulakci, S. Redana, B. Raaf, J. Hamalainen. Evaluating the Energy Efficiency of LTE-Advanced Relay and Picocell Deployments. In IEEE Wireless Communications and Networking Conference (WCNC 2012), Paris, France, pp. 2335-2340, April 2012.
- [Publication 7]: O. Bulakci, A. Bou Saleh, S. Redana, B. Raaf, J. Hamalainen. Resource Sharing in LTE-Advanced Relay Networks: Uplink System Performance Analysis. Transactions on Emerging Telecommunications Technologies (ETT), [Invited Paper] Special Issue on Multi-Carrier Transmission, LTE and LTE-Advanced, vol. 24, issue 1, pp. 32-48, January 2013.
- [Publication 8]: O. Bulakci, A. S. Nedelcu, A. Bou Saleh, S. Redana, J. Hamalainen. Impact of Backhaul Subframe Misalignment on Uplink System Performance of LTE-Advanced Relay Networks. In IEEE Vehicular Technology Conference (VTC Fall 2012), Quebec City, Canada, pp. 1-6, September 2012.
- [Publication 9]: O. Bulakci, A. Bou Saleh, S. Redana, B. Raaf, J. Hamalainen. Enhancing LTE-Advanced Relay Deployments via Relay Cell Extension. In the 15th International OFDM Workshop (InOWo 2010), Hamburg, Germany, pp. 1-6, September 2010.
- [Publication 10]: A. Bou Saleh, O. Bulakci, S. Redana, J. Hamalainen. On Cell Range Extension in LTE-Advanced Type 1 Inband Relay Networks. Accepted for publication in Wireless Communications and Mobile Computing (WCM), December 2012.
- [Publication 11]: D. W. Kifle, O. Bulakci, A. Bou Saleh, S. Redana, G. Fabrizio. Joint Backhaul Co-scheduling and Relay Cell Extension in LTE-Advanced Networks: Uplink Performance Evaluation. In IEEE/VDE European Wireless Conference (EW 2012), Poznan, Poland, pp. 1-8, April 2012.