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Anwer Al-Dulaimi

Email: anwer.al-dulaimi@brunel.ac.uk

Supervisor: Prof. John Cosmas

PhD Research Title:  Cognitive Radio Systems in LTE Networks

The most important fact in the mobile industry at the moment is that demand for wireless services will continue to explode in the coming years. Therefore, it is vital to find more spectrum through cognitive radios for the growing numbers of services and users. However, the spectrum reallocations, enhanced receivers, shared use, or secondary markets—will not likely, by them¬selves or in combination, meet the real exponential increases in demand for wireless resources. Network operators will also need to re-examine network architecture, and consider integrating the fibre and wireless networks to address this issue. This research involves driving fibre deeper into cognitive net¬works, deploying microcells connected through fibre infrastructure to the backbone wireless networks, and developing the algorithms for diverting calls between the wireless and fibre systems, introducing new coexistence models, and mobility management. This research addresses the network deployment scenarios to a microcell-aided cognitive network, specifically slicing the spectrum spatially and providing reliable coverage at either tier.

The research contributions consist of the development of new MAC layer models, cooperative channelization, coexistence algorithms and uplink/downlink OFDM schedulers for the cognitive radio using LTE technologies. The goals of my research were to achieve software tuneable conversion modules and adaptive cell domains with less heterogeneous complexity. This has leaded me to develop new schemes and algorithm for IP layers and power consumption.

One of the aims is to optimise the most efficient equipment density and network planning for the cognitive networks that can collaborate efficiently to use the available spectrum. This helps to overcome possible disruption in services resulting from the competition of secondary systems in accessing limited resources. The case study use a dynamic wireless environment similar to real applications composed of primary and secondary networks as shown in figure below.  

 

Adding more microcells to fixed sized LTE macrocell. The microcells can be side to side or overlapped in their coverage areas

This research proposes new method of decentralised-to-distributed management techniques that overcomes the spectrum unavailability barrier overhead in ongoing and future deployments of tiered cognitive network architectures. Such adjustments will allow new opportunities in cognitive-to-fibre systematic future investment strategies.

Publications:

Book:

• A. Al-Dulaimi, J. Cosmas, and A. Mohammed, Organization and Green Applications in Cognitive Radio Networks, Pennsylvania, USA: IGI Global, Jan. 2013 (In production). http://www.igi-global.com/book/self-organization-green-applications-cognitive/69852&f=hardcover-perpetual-access

Book Chapters:

• A. Al-Dulaimi, S. Al-Rubaye, and J. Cosmas, “Adaptive Coexistence between Cognitive and Fibre Networks,” in Wireless Multi-Access Environments and Quality of Service Provisioning: Solutions and Application. G. M. Muntean and R. Trestian, Ed. Pennsylvania, USA: IGI Global, 2011, pp. 311 - 336.
• S. Al-Rubaye, A. Al-Dulaimi, and J. Cosmas, “Spectrum Handover Strategies for Cognitive Femtocell Networks”, in Femtocell Communications: Business Opportunities and Deployment Challenges. R. A. Saeed, B. S. Chaudhari, and R. A. Mokhtar, Ed. Pennsylvania, USA: IGI Global, 2011, pp. 85 - 102.
   
  Journals:
• A. Al-Dulaimi and J. Cosmas “Optimum Planning for Cognitive LTE Radio Networks,” IEEE/ACM Transactions on Networking, 2012 (Under review).
• A. Al-Dulaimi and J. Cosmas, “Spectral Efficiency of CRoF Microcellular Model,” IEEE Electronic Letters, 2012 (Under review).
• A. Al-Dulaimi, H. Al-Raweshidy, J. Cosmas, and J. Loo, “Cognitive Mesh Networks, Cognitive Radio over Fibre for Microcells Application”, IEEE Vehicular Technology Magazine, vol. 5, no. 3, 2010, pp. 54 - 60.
• S. Al-Rubaye, A. Al-Dulaimi and J. Cosmas, “Cognitive Femtocell, Future Wireless Networks for Indoor Applications”, IEEE Vehicular Technology Magazine, vol. 6, no. 1, 2011, pp. 44 - 51.
• S. Al-Rubaye, A. Al-Dulaimi, H. Al-Raweshidy, “Next Generation Optical Access Network using CWDM Technology”, International Journal of Communications, Network and System Sciences (IJCNS), no. 7, 2009, pp. 636 - 640.

White papers:

• A. Al-Dulaimi et al, “Cognitive Radio Systems,” white paper, eMobility Technology Platform, Expert Working Group (EWG7), Nov. 11, 2009.
• A. Al-Dulaimi et al, “SARA, Strategic Applications Agenda and Strategic Research Agenda, Future Internet,” white paper, eMobility CA consortium, 2010.

Conferences:

• A. Al-Dulaimi, S. Al-Rubaye and J. Cosmas, “Adaptive Congestion Control for Mobility in Cognitive Radio Networks,” In proceedings of the 7th International Conference on Wireless Advanced(WiAd), Kings College London, London, 2011, pp. 273 - 277.
• S. Al-Rubaye, A. Al-Dulaimi, and J. Cosmas, “Pilot Power Optimization for Autonomous Femtocell Networks,” ,” In proceedings of the 7th International Conference on Wireless Advanced(WiAd), Kings College London, London, 2011, pp. 170 - 175.
• A. Al-Dulaimi, S. Al-Rubaye, J. Cosmas, I. Siaud, and P. Cordier, “Radio over Fibre,” Orange Briefing, WWRF#25 meeting, London, Nov 2010.
• A. Al-Dulaimi, S. Al-Rubaye and H. Al-Raweshidy, “Radio over Fibre Transceiver Designed for Cognitive Communications Architecture,” WWRF#25 meeting, London, Nov 2010.
• A. Al-Dulaimi and J. Cosmas, “Mobility Management for Microcells based Cognitive Radio over Fibre Networks,” WWRF#25 meeting, London, Nov 2010.
• A. Al-Dulaimi, S. Al-Rubaye, H. Al-Raweshidy, J. Cosmas, and J. Loo, “Multi-Zones of Cognitive to Fibre Networks,” In proceedings of the 7th IEEE International Symposium on Communication Systems, Networks And Digital Signal Processing (CSNDSP’10), Newcastle, UK, 2010, pp. 697 - 700.
• A. Al-Dulaimi and L. AL-Saeed, “An Intelligent Scheme for First Run Cognitive Radios,” In proceedings of the 4th IEEE International Conference and Exhibition on Next Generation Mobile Applications, Services, and Technologies (NGMAST'10), Amman, 2010, pp. 158 - 161.
• A. Al-Dulaimi, S. Al-Rubaye, and H. Al-Raweshidy, “Renovate Cognitive Networks under Spectrum Unavailability,” In proceedings of the 6th Advanced International Conference on Telecommunications (AICT 2010), Barcelona, Spain, 2010, pp. 41 - 45.
• A. Al-Dulaimi and H. Al-Raweshidy, “Cognitive Radio over Fibre for Microcells Applications,” Wireless World Research Forum (WWRF-WG6), Penang Island, Malaysia, 2010.
• S. Al-Rubaye, A. Al-Dulaimi, L. Al-Saeed, H. Al-Raweshidy, E. Kadhum, W. Ismail ,“Development of Heterogeneous Cognitive Radio and Wireless Access Network,” WWRF#24, Malaysia, April 12 - 14, 2010.
• A. Al-Dulaimi, “CRoF: Cognitive Radio over Fibre,” 2010 European Reconfigurable Radio Technologies Workshop, Mainz, Germany,   2010, pp.181 - 182.  
• A. Al-Dulaimi, N. Radhi, and H. S. Al-Raweshidy, “Cyclostationary Detection of Undefined Secondary Users,” In proceedings of the 3rd International Conference and Exhibition on Next Generation Mobile Applications, Services, and Technologies (NGMAST'09), Cardiff, UK, 2009, pp. 230 - 233. 
• A. Al-Dulaimi and H. S. Al-Raweshidy, “Multi-Operator Cognitive Radios Sharing One Channel,” In proceedings of the 7th ACM international symposium on Mobility management and wireless access (MobiWac’09), Tenerife, Spain, 2009, pp. 114 - 117.

Tutorials:

• A. Al-Dulaimi, “Cognitive Radio over Fibre for Future Mesh Networks,” Industry Forum (IF) of the IEEE International Conference on Communications (ICC2012), Ottawa, Canada, 2012.
• A. Al-Dulaimi and Saba Al-Rubaye, “Cognitive Radios in LTE Networks,” Industry Forum (IF) of the IEEE Global Communications Conference (GLOBECOM), California, USA, 2012, (Under review).