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Heuristic Burst Construction Algorithm for Improving Downlink Capacity in IEEE 802.16 OFDMA Systems

机译:在IEEE 802.16 OFDMA系统中提高下行链路容量的启发式突发构造算法

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IEEE 802.16 OFDMA systems have gained much attention for their ability to support high transmission rates and broadband access services. For multiuser environments, IEEE 802.16 OFDMA systems require a resource allocation algorithm to use the limited downlink resource efficiently. The IEEE 802.16 standard defines that resource allocation should be performed with a rectangle region of slots, called a burst. However, the standard does not specify how to construct bursts. In this paper, we propose a heuristic burst construction algorithm, called HuB, to improve the downlink capacity in IEEE 802.16 OFDMA systems. To increase the downlink capacity, during burst constructions HuB reduces resource wastage by considering padded slots and unused slots and reduces resource usage by considering the power boosting possibility. For simple burst constructions, HuB makes a HuB-tree, in which a node represents an available downlink resource and edges of a node represent a burst rectangle region. Thus, making child nodes of a parent node is the same as constructing a burst in a given downlink resource. We analyzed the proposed algorithm and performed simulations to compare the performance of the proposed algorithm with existing algorithms. Our simulation study results show that HuB shows improved downlink capacity over existing algorithms.
机译:IEEE 802.16 OFDMA系统因其支持高传输速率和宽带接入服务的能力而备受关注。对于多用户环境,IEEE 802.16 OFDMA系统需要一种资源分配算法来有效地使用有限的下行链路资源。 IEEE 802.16标准定义应使用称为突发的时隙矩形区域执行资源分配。但是,该标准未指定如何构造突发。在本文中,我们提出了一种启发式突发构建算法,称为HuB,以提高IEEE 802.16 OFDMA系统的下行链路容量。为了增加下行链路容量,在突发结构期间,HuB通过考虑填充的时隙和未使用的时隙来减少资源浪费,并通过考虑功率提升的可能性来减少资源使用。对于简单的突发结构,HuB会创建一个HuB树,其中一个节点代表一个可用的下行链路资源,一个节点的边缘代表一个突发矩形区域。因此,使父节点的子节点与在给定的下行链路资源中构造突发相同。我们分析了提出的算法并进行了仿真,以比较提出的算法与现有算法的性能。我们的仿真研究结果表明,与现有算法相比,HuB的下行链路容量有所提高。

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