一种提升高速铁路无线通信网络HARQ性能的方法

发布时间：2019-08-26 16:49

【摘要】：在长期演进LTE无线通信系统应用到高速铁路环境时,较高的移动速度、复杂的沿线环境将给系统混合自动重传请求HARQ性能带来较大的不利影响。本文对LTE HARQ在高速铁路场景下的性能进行分析,结果表明,相对于不采用HARQ技术,带有HARQ机制的系统具有较低的误块率、较高的吞吐量;然而,相比于公网静止用户场景,高速铁路移动用户的性能有所下降;本文提出一种增强小区重叠区HARQ传输性能的机制。性能分析表明,保存错误包待接入目标小区后合并解码,可使这些数据包在目标小区重发时的错误率降低55%,并提升了吞吐量。相比于不降低最大传输次数的情况,此方案在切换触发前给新数据包提供了更多的传输机会,使接入目标eNodeB重传前转数据包时,吞吐量提升了12%左右。
[Abstract]:When the long-term evolution LTE wireless communication system is applied to the high-speed railway environment, the high mobile speed and the complex linear environment will have a great adverse effect on the hybrid automatic repeat request HARQ performance of the system. In this paper, the performance of LTE HARQ in high-speed railway is analyzed. The results show that the system with HARQ mechanism has lower error block rate and higher throughput with respect to the non-use of HARQ technology. However, compared with the public network still user scene, The performance of high-speed railway mobile users has decreased, and a mechanism to enhance the HARQ transmission performance of the cell overlap area is presented in this paper. The performance analysis shows that the error rate of the data packets when the target cell is re-sent is reduced by 55% and the throughput is improved. Compared with the case that the maximum number of transmission is not reduced, the scheme provides more transmission opportunities to the new data packet before the handover trigger, so that the throughput is improved by about 12% when the access target eNodeB retransmits the forwarding data packet.
【作者单位】：西南交通大学信息编码与传输四川省重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2012CB316100) 国家自然科学基金(61071108,61032002)
【分类号】：TN929.5

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