A Framework for Co-Channel Interference and Collision Probability Tradeoff in LTE Licensed-Assisted Access Networks
A Framework for Co-Channel Interference and Collision Probability Tradeoff in LTE Licensed-Assisted Access Networks
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DOI：
10.1109/twc.2016.2577687
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发表时间：
2016-09
影响因子：
10.4
通讯作者：
Rui Yin;Guanding Yu;A. Maaref;Geoffrey Y. Li
中科院分区：
文献类型：
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作者：
Rui Yin;Guanding Yu;A. Maaref;Geoffrey Y. Li
异构网络中的小小区部署（其中小小区基站（SBS）与传统宏小区基站一起部署）是用于增强长期演进（LTE）网络中的许可频谱上的空间频率重用的经验证的解决方案。为了缓解授权频谱资源的短缺，已经引入了授权辅助接入（LAA）以允许LTE SBS与WiFi节点共享未授权信道。因此，由SBS联合利用授权和未授权频谱资源以满足小小区用户（SUE）的服务质量（QoS）要求导致复杂但有趣的优化问题。在本文中，我们强调了基本的权衡由SBS引起的共信道干扰（CI）的数量之间的许可频谱资源的重用和冲突概率（CP）施加在共存的WiFi节点，由于在这样一个共存的LTE LAA-WiFi异构网络部署的共享未授权频谱资源。我们发现，这个基本的权衡可以分析通过开发一个功率分配规则与双注水线和帕累托最优解的完整集合可以通过加权切比雪夫方法实现。我们的仿真结果表明，所提出的联合资源分配算法可以实现一个灵活的和适当的折衷之间的授权频谱CI和WiFi CP根据LTE LAA网络中SUE的QoS要求。
Small cell deployment in heterogeneous networks, whereby small cell base stations (SBS) are deployed alongside traditional macro-cell base stations, is a proven solution for enhancing spatial frequency reuse across licensed spectrum in long-term evolution (LTE) networks. In order to mitigate the shortage of licensed spectrum resources, licensed-assisted access (LAA) has been introduced to allow LTE SBSs to share the unlicensed channel with WiFi nodes. As such, a complex yet interesting optimization problem results from the joint utilization of licensed and unlicensed spectrum resources by the SBSs to meet the quality-of-service (QoS) requirements of small cell users (SUEs). In this paper, we highlight the fundamental tradeoff induced by the SBSs between the amount of co-channel interference (CI) resulting from the reuse of licensed spectrum resources and the collision probability (CP) imposed on the co-existing WiFi nodes due to the sharing of unlicensed spectrum resources in such a coexisting LTE LAA-WiFi heterogeneous network deployment. We find that this fundamental tradeoff can be analyzed by developing a power allocation rule with double water-filling lines and the complete set of Pareto optimal solution can be achieved by the weighted Tchebycheff method. Our simulation results show that the proposed joint resource allocation algorithm can achieve a flexible and suitable tradeoff between the licensed spectrum CI and the WiFi CP according to the QoS requirements of SUEs in LTE LAA networks.