A Dynamic Radio Resource Allocation Policy in a Multi-cell System Configuration for IEEE 802.16m Standard
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Abstract
Supporting users’ mobility seems to be a promising and challenging feature of emerging IEEE 802.16m wireless networks. Encouraged by its low complexity in terms of configuration [1], we implement a Hard Handover (HHO) mechanism to manage users’ mobility in a multi-cell system context. However, the “break before make†principle of such handover type decreases the system performances in terms of dropped users ratio and latency time [2]. To resolve such problems, we propose a new adaptive sub-channels allocation scheme in a downlink Orthogonal Frequency Division Multiple Access (OFDMA) system. Our basic idea is to reserve a part of radio resources based on a configurable HHO-threshold and then to allocate them to users in handover depending on their maximum Signal-to-Interference Noise Ratio (SINR) in order to maximize the total system capacity. Our proposed sub-channels assignment scheme is based on statistic parameters, mean and variance of the frequency response channel gain for every Mobile Station (MS). Simulation results demonstrate that our proposed scheme decreases dropped users ratio, reduces calls latency time and enhances the total system capacity while enjoying a low computational complexity.
Keywords: IEEE 802.16m; mobility; hard handover; HHO-threshold; sub-channels reservation.
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