Cross-layer modeling for quality of service guarantees over wireless links
Cross-layer modeling for quality of service guarantees over wireless links
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DOI：
10.1109/twc.2007.06087
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发表时间：
2007-12
影响因子：
10.4
通讯作者：
Jia Tang;Xi Zhang
中科院分区：
文献类型：
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作者：
Jia Tang;Xi Zhang
我们提出了一个跨层的方法来调查的物理层基础设施的数据链路层的服务质量（QoS）性能的影响，在无线链路在移动的网络。在物理层，我们考虑多输入多输出（MIMO）分集方案以及自适应调制和编码（AMC）技术。在数据链路层，我们的重点是如何影响这个物理层的基础设施的实时多媒体延迟约束的QoS性能。为了实现这一目标，我们首先模型的物理层服务过程作为一个有限状态马尔可夫链（FSMC）。基于此FSMC模型，我们然后在数据链路层使用有效容量的方法，这原来是至关重要的统计QoS保证在移动的网络中的无线链路的QoS性能的特点。我们还研究了物理层功率控制和信道状态信息（CSI）反馈延迟对QoS性能的影响。数值结果表明，我们提出的跨层模型可以有效地表征物理层基础设施和数据链路层QoS性能之间的相互作用。
We propose a cross-layer approach to investigate the impact of physical-layer infrastructure on data-link-layer quality-of-service (QoS) performance over wireless links in mobile networks. At the physical layer, we take multiple-input-multiple-output (MIMO) diversity schemes as well as adaptive-modulation-and-coding (AMC) techniques into account. At the data-link layer, our focus is on how this physical-layer infrastructure influences the real-time multimedia delay-bound QoS performance. To achieve this goal, we first model the physical-layer service process as a finite-state Markov chain (FSMC). Based on this FSMC model, we then characterize the QoS performance at data-link-layer using the effective capacity approach, which turns out to be critically important for the statistical QoS guarantees over wireless links in mobile networks. We also investigate the impact of physical-layer power control and channel-state information (CSI) feedback delay on the QoS performance. The numerical results obtained demonstrate that our proposed cross-layer model can efficiently characterize the interactions between the physical-layer infrastructure and data-link-layer QoS performance.