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An Overview on Radio Access Technology (RAT) Selection Algorithms for Heterogeneous Wireless Networks

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Author(s): J. Preethi | S. Palaniswami

Journal: International Journal of Computer Science and Information Security
ISSN 1947-5500

Volume: 9;
Issue: 5;
Start page: 100;
Date: 2011;
Original page

Keywords: Radio Access Technology (RAT) selection | Joint Radio Resource Management (JRRM) | Heterogeneous Wireless Networks

ABSTRACT
Next generation wireless networks (NGWN) will be heterogeneous in nature where different radio access technology coexist in the same coverage area. The coexistence of different RATs require a need for Joint Radio Resource Management (JRRM) to support the provision of quality of service and efficient utilization of radio resources. The Joint Radio Resource Management (JRRM) manages dynamically the allocation and deallocation of radio resources between different Radio Access Technology (RAT). The homogenous Call Admission Control (CAC) algorithms do not provide a single solution to address the heterogeneous architectures which characterize next generation wireless networks. This limitation of homogeneous CAC algorithms necessitates the development of RAT selection algorithms for heterogeneous wireless network. The goal is to select the most suitable RAT for each user. This paper investigates ten different approaches for selecting the most appropriate Radio Access Technology (RAT) for incoming calls among the Heterogeneous Wireless Networks. The advantages and disadvantages of each approach are discussed. This RAT selection works in two steps; the first step is to select a suitable combination of cells among the different RATs. The second step chooses the most appropriate RAT to which the users can be attached and to choose the suitable bandwidth to allocate for the users.
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