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Uplink scheduling in clustered 3G network with mobile relaying

机译:带有移动中继的集群式3G网络中的上行链路调度

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Hybrid wireless networks are characterized by simultaneously using several radio interfaces to boost system performances. A practical and promising architecture to achieve a better uplink throughput in the traditional CDMA cell is to locally aggregate mobile-generated traffic to some cluster heads through WLAN. Such an architecture opens up questions of the desired clustering structures as well as new uplink scheduling strategies. The scheduling of the aggregated traffic at the cluster heads (called relayed mobile terminals later) is investigated in this work. The proposed uplink scheduling algorithm takes the aggregated traffic nature into account. The scheduling goal is to achieve good throughput under the traffic QoS requirements (e.g. BER, bit-error-rates) and limited power budget at the mobile station. The proposed scheduling algorithm consists of two levels: (1) we use a proportional scheduling algorithm to coordinate the transmission among relaying mobile terminals (RMTs), where the main objective is to achieve high spectrum efficiency and reasonable fairness; (2) within RMT, packets from different leave nodes, with different BER requirements are further scheduled via a link-adaptive CDMA (LA-CDMA) transmission scheme. By exploiting the QoS diversity of the queued packets, the LA-CDMA scheduler is able to generate better usage of power budget, which allows some BER-stringent packets to be transmitted at a higher data rate. The performance improvement of the LA-CDMA scheduler is demonstrated by our simulation results. The system goodput is increased by up to 17% for some traffic type. Our simulation also shows the dynamic of expected BERs, the allocation of transmission power and the modulation depth of the LA-CDMA scheduler.
机译:混合无线网络的特点是同时使用多个无线电接口来提高系统性能。在传统CDMA单元中实现更好的上行链路吞吐量的实用且有希望的架构是通过WLAN将移动生成的流量本地聚合到某些群集头。这样的架构提出了关于期望的集群结构以及新的上行链路调度策略的问题。在这项工作中研究了群集头(以后称为中继移动终端)上的聚合流量的调度。所提出的上行链路调度算法考虑了聚合的流量性质。调度的目标是在业务QoS要求(例如BER,误码率)和移动站有限的功率预算下实现良好的吞吐量。所提出的调度算法包括两个层次:(1)我们采用比例调度算法来协调中继移动终端(RMT)之间的传输,其主要目标是实现高频谱效率和合理的公平性; (2)在RMT中,通过链路自适应CDMA(LA-CDMA)传输方案进一步调度来自不同离开节点的,具有不同BER要求的数据包。通过利用排队数据包的QoS分集,LA-CDMA调度程序能够更好地利用功率预算,从而允许以更高的数据速率传输某些BER严格数据包。我们的仿真结果证明了LA-CDMA调度器的性能提高。对于某些流量类型,系统吞吐量提高了17%。我们的仿真还显示了预期BER的动态,传输功率的分配以及LA-CDMA调度器的调制深度。

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