Abstract
We propose a frequency planning based on zone switching diversity scheme for multicell OFDMA mobile WiMAX networks. In our approach, we focus on the use of Fractional Frequency Reuse (FFR) for guaranteeing the quality of service for the different service flows in the system. We investigate an architecture that coordinates the allocation of resources in terms of slots (the basic allocation unit in time and frequency domain in an OFDMA frame) between the Radio Resource Controller (RRC) and the Radio Resource Agent (RRA) which resides in the Base Station (BS). The proposed algorithm attempts to capture three types of diversity, namely, mutual interference diversity, traffic diversity, and selective fading channel diversity. As a consequence, the proposed algorithm for slot allocation makes a trade-off between maximizing overall throughput of the system while guaranteeing the Quality of Service (QoS) requirements for a mixture of real-time and non-real-time service flows under different diversity configurations. Our algorithm is evaluated under various cell configurations and traffic models. The results reveal important insights on the trade-off between cell interference suppression and QoS assurance.
Highlights
One of the major concerns in mobile WiMAX networks is the optimization of radio resource utilization, which can be enhanced by the frequency reuse when multicells scenarios are deployed
Even though the WiMAX Forum specified an architecture for resource allocation for mobile WiMAX systems [13], functions related to resource allocation using fractional frequency reuse (FRR) are not described in such architecture
The first one is uncoordinated in the sense that there is no Resource Controller (RRC) and the resource allocation is based on local information, we refer to this method as “Random” as slots are allocated randomly among MSs
Summary
One of the major concerns in mobile WiMAX (based on IEEE 802.16e standard) networks is the optimization of radio resource utilization, which can be enhanced by the frequency reuse when multicells scenarios are deployed. Authors in [3,4,5,6] proposed dynamic resource allocation scheme for guarantying QoS requirements while maximizing the whole throughput of the system Both schemes work only for non real-time application References [7,8,9] introduced the Radio Network Controller (RNC) to control a cluster of Base Station (BSs) in the multicell OFDMA system and to allocate resources in a distributed way these schemes allocate resources in the RNC without taking into account the reallocation scheme at each BS for coordinating resource according to the FFR.
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