Usage of link-level performance indicators for HSDPA network-level simulations in E-UMTS
Usage of link-level performance indicators for HSDPA network-level simulations in E-UMTS
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DOI：
10.1109/isssta.2004.1371820
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发表时间：
2004-08
期刊：
影响因子：
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通讯作者：
F. Brouwer;I. D. Bruin;J. C. Silva;N. Souto;F. Cercas;A. Correia
中科院分区：
文献类型：
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作者：
F. Brouwer;I. D. Bruin;J. C. Silva;N. Souto;F. Cercas;A. Correia
本文介绍了集成HSDPA（高速下行链路分组接入）链路级仿真结果到网络级仿真增强UMTS。链路级仿真对3GPP标准中描述的所有物理层特征进行建模。这些包括：生成传输块; turbo编码;速率匹配;扩频;加扰;调制。在接收端，所有的互补块的设计，软判决解调，和一个Turbo解码器使用MAP（最大后验概率）算法与8次迭代。定义了一个分析公式，该公式拟合了在AWGN信道中依赖于CQI（信道质量指示符）的BLER（误块率）与E/sub B//N/sub 0/的关系。该公式对网络级模拟器中的物理层进行建模。已经定义了频率选择性衰落信道的进一步扩展。网络级仿真器包括提供SNR值的传播模型。基于这些SNR值和简化的物理层模型，算法选择CQI，并确定接收时的实际BLER。对应于W-CDMA标准的CQI报告的舍入和延迟对HS-DSCH的吞吐量和传输延迟具有显著影响。在改进的变速器中可以找到一些补偿。链路级和网络级仿真器的集成提供了准确和现实的结果，可以用于更多的研究，重点放在基于分组的服务在HSDPA的网络层方面。
The paper describes integration of HSDPA (high-speed downlink packet access) link-level simulation results into network-level simulations for enhanced UMTS. The link-level simulations model all physical layer features depicted in the 3GPP standards. These include: generation of transport blocks; turbo coding; rate matching; spreading; scrambling; modulation. At the receiver side, all complementary blocks are designed, with soft-decision demodulation, and a turbo decoder using the MAP (maximum a posteriori) algorithm with 8 iterations. An analytical formula is defined that fits the CQI (channel quality indicator) dependent BLER (block error rate) versus E/sub b//N/sub 0/ results in an AWGN channel. This formula models the physical layer in the network-level simulator. A further extension for frequency selective fading channels has been defined. The network-level simulator includes propagation models that provide SNR values. Based on these SNR values and the simplified physical layer model, an algorithm selects the CQI, and determines the actual BLER at time of reception. The rounding down and delaying of the CQI reporting, which corresponds to the W-CDMA standard, has a significant impact on throughput and transfer delay of the HS-DSCH. Some compensation can be found in a modified transmission. The integration of the link-level and network-level simulators gives accurate and realistic results that can be used in more studies that focus on network layer aspects of packet based services over HSDPA.