Journal on Communications ›› 2021, Vol. 42 ›› Issue (4): 22-43.doi: 10.11959/j.issn.1000-436x.2021094
• Topics: Strategic Technologies to Massive Connecting for the Future Mobile Networks • Previous Articles Next Articles
Zhihong QIAN, Lin XIAO, Xue WANG
Revised:
2021-04-10
Online:
2021-04-25
Published:
2021-04-01
Supported by:
CLC Number:
Zhihong QIAN, Lin XIAO, Xue WANG. Review on strategic technology of dense connection for the future mobile network[J]. Journal on Communications, 2021, 42(4): 22-43.
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分类 | 含义 | 方案特性 | 文献 |
基于代价函数 | 将影响用户体验的指标加权在一起,用户通过对比候选网络的代价函数值进行选择 | 权重的建立往往具有较大的主观性,如果参数两两对比后显示不一致,则需要再次耗时构造判断矩阵检查 | 文献[ |
基于组合优化算法 | 通常采用模糊逻辑算法和人工神经网络算法等。用户收集网络参数,并上报给切换管理实体,利用人工神经网络进行训练,得到接入决策结果 | 需要中心控制实体进行辅助 | 文献[ |
基于负载均衡 | 将终端设备的接入请求分配至负载最低的接入点,当系统的负载达到一定程度时,将执行垂直切换进行重新分布,达到负载均衡 | 用户有可能连接到质量较差的网络中,无法有效保障用户实时或非实时业务的QoS需求 | 文献[ |
基于博弈论 | 在多用户同时接入选网的环境下,有较高的公平性和准确性 | 所有参与者都计算各自的利益,可能会损害异构网络整体性能;为了不同参与者的纳什均衡收敛,算法复杂度高;一个博弈周期只能得出一个用户选网结果,密集用户选网效率低 | 文献[ |
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类别 | 技术 | 方法 | 文献 | 优点 | 缺点 |
天线抵消 | — | 文献[ | 易实施,抵消能力,稳健性好 | 需手动调谐射频电路,固定天线,发射功率受限 | |
被动自干扰消除 | 定向天线 | — | 文献[ | 降低Tx与Rx之间耦合的可能性 | 天线波束范围限制 |
天线隔离 | — | 文献[ | 由于路径损耗,SI 信号强度衰减;设备间干扰低 | 设备体积、地理位置、成本受限制;仅限SISO场景 | |
直接耦合 | 文献[ | 对线性和非线性干扰都能有效抑制 | 灵活性不够 | ||
主动自干扰消除 | 射频域 | 间接耦合 | 文献[ | 射频域自干扰消除结构易实现,原理简单 | 成本较高,器件所占用体积大 |
基于导频法 | 文献[ | 调制独立性 | 抵消能力有限 | ||
数字域 | 自适应消除 | 文献[ | 自适应对抗时变环境,实时性好 | 很难兼顾收敛性和稳态性 | |
基于预编码 | 文献[ | 能实现高级优化,容量优化 | 需信号估计,需进行自干扰信道矩阵的奇异值分解 |
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方向 | 类别 | 方法 | 性能分析 | 文献 |
信道估计 | 线性信道估计 | 提出了一种基于压缩的线性最小均方误差信道估计算法 | 与传统的线性相比,降低了计算复杂度,提高了效率 | 文献[ |
非线性信道估计 | 利用物理环境中有限散射引起的低秩特性,提出了一种基于并行因子的估计方案 | 较ESPRIT算法,显著提高了估计性能。在天线数目较大的情形下,计算复杂度小 | 文献[ | |
帧结构 | 基于导频移位结构 | 确定波束成形向量以减少来自其他小区的干扰;执行接收波束成形;进行信道估计 | 有效地降低了导频干扰的影响,并提高了频谱效率 | 文献[ |
叠加型结构 | 提出了基于叠加导频的信道估计非迭代方案,推导了匹配滤波器输出端的上行SINR | 叠加型帧结构在提高大规模MIMO系统频谱利用率方面要优于传统帧结构 | 文献[ | |
导频分配 | 基于信道协方差 | 将设备分组,用信道协方差矩阵的正交性衡量用户间潜在干扰,为其分配相同导频序列而不影响系统性能 | 提高了频谱效率;在高信噪比和强相关情况下,均方误差性能增益显著。 | 文献[ |
智能导频分配 | 测量相同导频用户引起的区间干扰;将最小干扰的导频分配给最差信道质量的用户 | 优化了系统内用户的最小上行SINR | 文献[ | |
预编码 | 线性编码 | ZF、匹配滤波、预编码、MMSE预编码 | 计算复杂度低,实用性强 | 文献[ |
非线性编码 | THP、脏纸编码 | 复杂度较高,但性能优于线性编码 | 文献[ |
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分类 | 含义 | 性能对比 | 文献 |
SA | 将时间分为离散的时隙,用户必须等到下一个时隙才可以发送数据 | 减少了数据产生冲突的可能性,提高了信道的利用率 | 文献[ |
DSA | 用户将相同的数据包在上行接入周期内不同时隙上重复发送多次 | 在适中的负载下,较SA相比吞吐量更高、时延更低。但对于密集用户接入网络场景,接入效果还是不理想 | 文献[ |
CRDSA | 在接收端引入了SIC,这使很多原本因碰撞而被丢失的数据包被还原出来,避免了重传 | 与DSA相比,CRDSA吞吐量和时延等性能都有所提高,且有更高的解决碰撞能力 | 文献[ |
IRSA | 每个用户均具有不同的数据包重发次数,并在接收端利用迭代置信传播对数据包解码 | 实现比CRDSA更高的吞吐量 | 文献[ |
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