Interoperability Between IEEE 802.11e and HSDPA: Challenges from Cognitive Radio
In this chapter we propose a scenario for interoperability between high-speed downlink packet access (HSDPA) and Wi-Fi. This scenario involves the end-user traveling in a public transportation system and requesting multimedia services to the operator. The interoperability between HSDPA and Wi-Fi (IEEE 802.11e standard) radio access technologies (RATs) is first addressed, a topology in which the user has access to both RATs was considered, together with a common radio resource management (CRRM) to manage the connections. We reached the conclusion that the CRRM enables to increase the system throughput when the load thresholds are set to 0.6 for HSDPA and 0.53 for Wi-Fi. Then, spectrum aggregation is implemented in HSDPA. A resource allocation (RA) algorithm allocates user packets to the available radio resources (in this case Node Bs operating at 2 and 5 GHz are available) in order to satisfy user requirements. Simulation results show that gains up to 22% may be achieved. We have also sought the most efficient way to manage routing packets inside the Wi-Fi network. The proposal which uses links with higher throughputs enables to reach the best results, with gains up to 300% in the packet delivery ratio. Finally, we discuss the challenges that need to be addressed in order to materialise the envisaged cognitive radio scenario in public transportation.
KeywordsCognitive Radio User Equipment Channel Quality Indicator Radio Access Technology Load Threshold
The authors would like to acknowledge the following projects who provided financial support: IST-UNITE (a Specific Targeted Research Project supported by the European 6th Framework Programme, Contract number IST-FP6-STREP-026906), Marie Curie European Reintegration Grant PLANOPTI (Planing and Optimization for the Coexistence of Mobile and Wireless Networks Towards Long Term Evolution, FP7-PEOPLE-2009-RG), UBIQUIMESH (Cross-Layer Optimization in Multiple Mesh Ubiquitous Networks ref PTDC/EEA-TEL/105472/2008), CROSSNET (a Portuguese Foundation for Science and Technology, FCT, POSC project with FEDER funding), Marie Curie Intra-European Fellowship OPTIMOBILE (Cross-layer Optimization for the Coexistence of Mobile and Wireless Networks Beyond 3G, FP7-PEOPLE-2007-2-1-IEF), and Projecto de Re-equipamento Científico REEQ/1201/EEI/2005 (an FCT project). João Ferro and Orlando Cabral acknowledge the Ph.D. grants from FCT ref. SFRH/BD/36742/2007 and SFRH/BD/28517/2006, respectively. Authors also acknowledge the COST Action 2100 - Pervasive Mobile & Ambient Wireless Communications, the Portuguese project Smart-Clothing, Valdemar Monteiro, Jonathan Rodrigues, Filippo Meucci, and Albena Mihovska.
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