下一代蜂窝区系统的反向链路接入计划比较

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下一代蜂窝区系统的反向链路接入计划比较
 摘要——对于蜂窝区系统反向链路上的数据传输，我们考虑数据包的不同传输选择。不同的传输选择按照蜂窝区内和蜂窝区间的干扰功率统计被分类。类别是：(a)无蜂窝区内干扰，平均蜂窝区间干扰； (b)无蜂窝区内干扰，突发蜂窝区间干扰；以及(c)平均蜂窝区内干扰，平均蜂窝区间干扰。根据反向链路采用的是单个用户的时分复用传输，还是有无蜂窝区正交性的多用户同步传输，我们将干扰结构归为上述三个类别中的一个。我们使用增加冗余的方法弥补干扰功率的不确定性，并分析每种情况下系统的吞吐量。我们比较不同选择对蜂窝区热增强(IROT)的限制和它为下一代蜂窝区系统反向链路的设计所提供的深层了解。我们的结果显示，当传输选择(a)蜂窝区内同步传输的用户数量最优时，与其它几种方案相比表现最佳。时分复用传输，不管突发蜂窝区间干扰功率结构如何，与多用户正交传输且移动设备有足够的传输功率实现目标IROT的小蜂窝区系统相比，吞吐量具有可比性。
 术语索引——码分多址接入(CDMA)，混合自动请求重传(HARQ)，正交频分多路复用接入(OFDMA)，时分多路复用接入(TDMA)。
          Ⅰ.介绍

A Comparison of Reverse Link Access Schemes for Next-Generation Cellular Systems
   Abstract--We consider different transmission options on the reverse link of cellular systems for packet data. The different transmission options are classified based on the nature of in-cell and out-of-cell interference power statistics. The categories are:(a) no in-cell interference, averaged out-of cell interference;(b) no in-cell interference, bursty out-of-cell interference; and (c) averaged in-cell interference, averaged out-of-cell interference. Depending on whether the reverse link transmission is time multiplexed one user at a time transmission, or simultaneous transmission by multiple users with or without in-cell orthogonality, the interference structure falls into one of the above three categories. We analyze the throughput performance of the system in each of these cases when incremental redundancy is employed to combat uncertainty in the interference power. We compare the different options under an in-cell rise-over-thermal (IROT) constraint and provide some insights for reverse link design for next-generation cellular systems. Our results show that transmission option (a) with an optimal choice of the number of simultaneous transmissions within the cell has the best performance over several different scenarios. Time-multiplexed transmissions, despite the bursty out-of-cell interference power structure, has throughput comparable to that of a multiple-user orthogonal transmission system for small cells where mobiles have sufficient transmit power to meet the target IROT.
   Index Terms--Code-division multiple access (CDMA), hybrid automatic repeat request (HARQ), orthogonal frequency-division multiple access (OFDMA), time-division multiple access (TDMA).
    Ⅰ.INTRODUCTION

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