Saba Al-Rubaye
Email: saba.al-rubaye@brunel.ac.uk
Supervisor: Prof. John Cosmas
PhD Research Title: Radio Network Management in 4G Cognitive LTE/Femtocell Systems
A cognitive radio management system involves various operations in different network layers in order to attain efficient spectrum utilisation. In this research, advanced approaches are proposed with novel algorithms and mathematical modelling for each of the investigated topics. The performance of the given solutions are evaluated at the system level and compared with existing literature solutions. The interaction among the proposed solutions considers system evaluation of huge sized network performance. This motivates to conduct system evaluations using the Optimised Network Engineering Tools (OPNET) simulator that provides multi-options for examining wide sized networks with different users’ numbers.
The system design for model evaluations involves two different networks coexist together as primary and secondary systems. This generates a wireless environment of dynamic spectrum access that is similar to the anticipated proposals for future heterogeneous networks. In this method, the primary users can access the spectrum at any time as the licensed spectrum occupiers. While, the cognitive network that is composed of LTE/femtocell nodes can access the spectrum on temporarily occasions whenever the primary system is offline. The proposed spectrum management architecture can be mainly classified into two parts: decision making and spectrum sensing as shown in Figure 1.
The new system considers the information from both Physical (PHY) sensors and Medium Access Control (MAC) layers as the factor inputs for the proposed algorithms. Jointly, a new entity named “channel allocation” is incorporated with the MAC layer to perform the spectrum access decisions and resource allocation actions. The development in the MAC layer included also the solution to reduce the power consumption of BS transmission with developed pipeline models.
Figure 1: Spectrum management architecture for cognitive radio networks
The proposed spectrum management system with the new algorithms allows increasing the utilisation of the available resources for the LTE system and improves the overall spectrum efficiency. Each of these spectrum management functions relies on cooperative operations where cognitive femtocell subscriber can determine their actions based on the information exchanged between femtocell users.
Publications
Book Chapters:
- Saba Al-Rubaye and John Cosmas, “Technical Challenges in 4G Cognitive Femtocell Systems”, book chapter for the book, Self-Organization and Green Applications in Cognitive Radio Networks, to be published by IGI Global, January 2013.
- Saba Al-Rubaye, Anwer Al-Dulaimi, and John Cosmas, “Spectrum Handover Strategies for Cognitive Femtocell Networks”, book chapter for the book “Femtocell Communications: Business Opportunities and Deployment Challenges”, IGI Global, ISBN-10: 1466600926, Ch. 6, pp. 85-102, 2012.
- Anwer Al-Dulaimi, Saba Al-Rubaye, and John Cosmas, “Adaptive Coexistence between Cognitive and Fibre Networks”, book chapter for the book “Wireless Multi-Access Environments and Quality of Service Provisioning: Solutions and Application,” IGI Global, Ch.13, pp. 311-336, 2012.
Journals:
- Saba Al-Rubaye, John Cosmas “A Novel Power Consumption Modelling for LTE/Femtocell Networks Deployment”, IEEE Journal on Selected Areas on Communications, July 2012, (Submitted).
- Saba Al-Ruabye and John Cosmas, “Network Capacity Planning for LTE Macrocell Systems”, IEEE Transaction on Communications, June 2012, (Under Review).
- Saba Al-Rubaye and John Cosmas, “Cognitive Radio over Femtocell Systems using Resource Management Approach”, Journal EURASIP Journal on Wireless Communications and Networking, April 2012, (Under Review).
- Saba Al-Rubaye, Anwer Al-Dulaimi and J. Cosmas, “Cognitive Femtocell, Future Wireless Networks for Indoor Applications”, IEEE Vehicular Technology Magazine, vol. 6, no. 1, pp. 44 - 5, 2011.
- Saba Al-Rubaye, Anwer Al-Dulaimi, Hamed Al-Raweshidy, “Next Generation Optical Access Network using CWDM Technology”, International Journal of Communications, Network and System Sciences (IJCNS), no 7, pp. 636-640, 2009.
Conferences:
- Saba Al-Rubaye, and John Cosmas, “Pilot Power Optimization for Autonomous Femtocell Networks,” In proc. of the 7th IEEE International Conference on Wireless Advanced, Kings College London, UK, 2011
- Anwer Al-Dulaimi, Saba Al-Rubaye and John Cosmas, “Adaptive Congestion Control for Mobility in Cognitive Radio Networks” In proc. of the 7th IEEE International Conference on Wireless Advanced, Kings College London, UK, 2011
- Haider AlSabbagh, Farhad Mahmood, Saba AL-Rubaye, and Robert Edwards “The Design of Fractal Antennas for UWB using MoM,” in Proc. of the IEEE/IET 5th European Conference on Antennas and Propagation, Loughborough Antennas and Propagation Conference (LAPC), Loughborough , UK, 2011
- Saba. Al-Rubaye, Anwer Al-Dulaimi and John Cosmas, “Cognitive Femtocells for Future Internet base on QoS,” In proc. of the 25th Wireless World Research Forum (WWRF#25), London, UK, Nov 2010.
- Saba. Al-Rubaye, “Green Radio over Fibre and Femtocell Access Network,” In proc. of the 25th Wireless World Research Forum (WWRF#25), London, UK, Nov 2010.
- Anwer Al-Dulaimi, Saba Al-Rubaye, Hamed Al-Raweshidy, John Cosmas, and Jonathan Loo, “Multi-Zones of Cognitive to Fibre Networks,” In proc. of the IEEE/IET International Symposium on Communication Systems, Networks And Digital Signal Processing (CSNDSP’10), Newcastle, UK, pp.762-765, 2010.
- Anwer Al-Dulaimi, Saba Al-Rubaye, and Hamed Al-Raweshidy, “Renovate Cognitive Networks under Spectrum Unavailability,” In proc. of the IEEE 6th Advanced International Conference on Telecommunications (AICT 2010), Barcelona, Spain, pp.41- 45, 2010
- Anwer Al-Dulaimi, Saba. Al-Rubaye, and Hamed Al-Raweshidy, “Radio over Fibre Transceiver Designed for Cognitive Communications Architecture,” In proc. of the 25th Wireless World Research Forum (WWRF#25), London, UK, Nov 2010
- Ekhlas Kadhum, Widad Ismail, and Saba al-Rubaye, “Noise Analysis based on BERT Using Hardware -in-the-loop co-simulation Based FSK Transceiver Through a Hybrid DSP/FPGA Platform,” In proc. of the 25th Wireless World Research Forum (WWRF#25), London, UK, Nov 2010.
- Saba Al-Rubaye, Anwer Al-Dulaimi, L. AL-Saeed, H. Al-Raweshidy, E. Kadhum, and Widad Ismail,“Development of Heterogeneous Cognitive Radio and Wireless Access Network,” In proc. of the 24th Wireless World Research Forum (WWRF#24), Penang Island, Malaysia, April 12-14, 2010.
- Ekhlas Kadhum, Widad Ismail, and Saba Al-Rubaye,” Software Digital modems for Software Defined Radio (SDR) using Hybrid architecture platform,” In proc. of the 24th Wireless World Research Forum (WWRF#24), Penang Island, Malaysia, April 12-14, 2010.
Posters:
- Saba. Al-Rubaye, “Energy Efficiency Scenarios in LTE/Femtocell Systems”, In Proc. of the Poster Graduate School Conference, Brunel University, London, UK, 2012.
- Saba. Al-Rubaye, “Cognitive Femtocell for Future Wireless Access Networks”, In Proc. of the Poster Graduate School Conference, Brunel University, London, UK, 2011.
