Future wireless access systems will be characterized by their heteogeneity from technological point of view. It is envisaged that in certain areas end-users will have a choice between various radio accesses (RAs) such as e.g. classical cellular networks (GSM, UMTS, WIMAX, etc), WLAN hot-spots, or over multiple hops via wireless ad-hoc networks. In this scenario it is crucial to select the most appropriate RA for a user at a given location requesting a particular service. This crucial task is performed by the radio access selection (RAS) algorithm. In this paper we evaluate four different RAS algorithms by simulations of a multi-radio access (MRA) system that consists of a cellular UMTS network and a centrally placed WLAN hot-spot. The evaluation compares the performance of the MRA system with respect to the blocking probability, resource utilization, average user throughput and the 90th user throughput percentile. The simulation results show that combining the resource pools and adding a radio resource consumption or throughput based criteria in the access selection results in almost two times higher supportable traffic load for a blocking probability target of 2%. The average data throughput is increased between 25% and 100%, depending on the traffic load, while the 90% data throughput is increased up to six times.
Radio Access Selection in Multi-Radio Access Systems
2007-11-01
3899587 byte
Conference paper
Electronic Resource
English
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