Joint User Association and Resource Allocation for Multi-Band Millimeter-Wave Heterogeneous Networks
Joint User Association and Resource Allocation for Multi-Band Millimeter-Wave Heterogeneous Networks
复制标题
多频段毫米波异构网络的联合用户关联和资源分配
DOI：
10.1109/tcomm.2019.2943158
复制
发表时间：
2019-12-01
影响因子：
8.3
通讯作者：
Li, Geoffrey Ye
中科院分区：
文献类型：
--
作者：
Liu, Rui;Chen, Qimei;Li, Geoffrey Ye
毫米波（mmWave）异构网络（HetNet）被认为是在5G时代提高蜂窝系统容量的有前途的手段。在本文中，我们研究了联合用户关联和资源分配问题，在多波段毫米波HetNet中，不同的频段具有不同的传播特性。根据用户是否可以同时在多个毫米波频段上进行传输，考虑了两种不同的接入方案：单频段接入方案和多频段接入方案。对于单频段接入方案，首先给出了最优时间分数分配的解析表达式，然后基于拉格朗日对偶分解方法和Newton-Raphson方法提出了一种联合用户关联和功率分配的迭代算法。对于多频带接入方案，我们开发了一个接近最优的解决方案的基础上的马尔可夫近似框架。我们的分析结果表明，不同的用户只能同时访问最多一个频段，虽然多频段接入方案允许一个用户在多个频段上传输。最后，数值结果表明，多频带接入方案的性能优于单频带接入方案，特别是在轻负载的情况下。
Millimeter-wave (mmWave) heterogeneous network (HetNet) has been regarded as a promising means to improve the cellular system capacity in the 5G era. In this paper, we investigate the joint user association and resource allocation problem in a multi-band mmWave HetNet where different bands have different propagation characteristics. According to whether a user can transmit on multiple mmWave bands simultaneously, two different access schemes are considered: the single-band access scheme and the multi-band access scheme. For the single-band access scheme, we first find a closed-form expression for the optimal time fraction allocation and then develop an iterative algorithm for joint user association and power allocation based on the Lagrangian dual decomposition methods and the Newton-Raphson method. For the multi-band access scheme, we develop a near-optimal solution based on the Markov approximation framework. Our analytical results reveal that different users can only access at most one band simultaneously although the multi-band access scheme allows a user to transmit on multiple bands. Finally, numerical results demonstrate that the multi-band access scheme performs better than the single-band access scheme, especially in the light load scenario.