IEEE 802.16宽带无线接入系统中QoS均衡的跨层下行调度方案

H. Hamouda, M. O. Kabaou, M. Bouhlel
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引用次数: 8

摘要

IEEE 802.16 OFDMA无线网络有望成为运营商在过去十年中使用的主要系统,因为它有希望提供高数据速率的解决方案。然而,IEEE 802.16在移动站(MSs)之间的分组调度和资源分配仍然是主要的挑战,因为在向MSs分配资源时存在不公平和低性能。此外,MaxSNR调度器通常被科学界认为是OFDMA无线网络中最有效的调度器。由于它的机会操作,它考虑到链路状态的变化,最大限度地提高系统吞吐量,因此可以容纳网络中非常多的用户。然而,这并不便宜:远离接入点的MSs比更近的MSs系统地受到惩罚;这是因为它们很少有利的传输条件(由路径损耗引起)。在本文中,我们提出了一种改进MaxSNR调度器,称为动态和公平MaxSNR (DFMaxSNR)。DFMaxSNR不仅包括利用机会调度器的概念,以最大限度地提高系统吞吐量,而且还包括纠正由路径损耗衰减引起的不平等频谱效率,以最大限度地减少实时应用的延迟和丢包率。性能评估表明,这种平衡良好的资源分配方案优于其他现有的调度器(MaxSNR、PF和RR),并证明不需要在高系统容量和高公平性之间进行选择。
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A Cross-Layer Downlink Scheduling Scheme for Balancing QoS in IEEE 802.16 Broadband Wireless Access Systems
IEEE 802.16 OFDMA wireless network is expected to be the dominant system used by operators in these last decade due to its promising solutions for providing high data rate. However, IEEE 802.16 packet scheduling and resources assigning among Mobile Stations (MSs) is still the main challenge due to unfairness and low performance which occur when allocating resources to MSs. Furthermore, MaxSNR scheduler is often recognized by the scientific community as the most effective in OFDMA wireless networks. Thanks to its opportunistic operation, it takes into account changes in the states of links, maximizes system throughput and so can accommodate a very large number of users in the network. However, this does not come cheap: MSs far from the access point are systematically penalized compared to closer ones; this is because of their little favorable transmission conditions (caused by path loss). In this paper, we propose an improvement to MaxSNR scheduler called Dynamic and Fair MaxSNR (DFMaxSNR). The DFMaxSNR consists not only of exploiting the concept of opportunistic scheduler in order to maximize system throughput, but also of correcting the unequal spectral efficiencies induced by path loss attenuations in order to minimize the delay and the packet loss rate for real time applications. Performance evaluation shows that this well-balanced resource allocation scheme outperforms other existing schedulers (MaxSNR, PF and RR) and demonstrate that choosing between high system capacity and high fairness is not required.
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