Joint user association and resource allocation in UE-Relay assisted heterogeneous networks
Joint user association and resource allocation in UE-Relay assisted heterogeneous networks
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DOI：
10.1109/iccw.2014.6881269
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
M. Mezzavilla;K. Somasundaram;M. Zorzi
中科院分区：
文献类型：
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作者：
M. Mezzavilla;K. Somasundaram;M. Zorzi
我们提出了一种新的方法，旨在通过使附近的空闲用户设备（UE）在毫微微蜂窝基站附近作为中继，称为UE中继，以扩展毫微微蜂窝基站的覆盖范围。名义上将连接到宏小区的用户经由UE中继器提供的覆盖扩展被卸载到毫微微小区。确定空闲UE的最佳子集被启用为UE中继和用户关联到这些中继的问题是一个不平凡的问题，因为它取决于中继接入和backhall.We制定的预计容量的用户关联作为一个优化问题，最大化的用户速率的全网络的日志效用。我们的仿真结果证实了我们的预期：覆盖一个毫微微蜂窝层与UE中继将增加用户吞吐量和网络吞吐量。此外，我们比较我们的方法与基于MAX-SINR的用户关联，并评估在不同的场景设置的性能配置文件。所提出的基于速率的方案优于基于SINR的小区选择，从而验证了这样的想法，即在异构蜂窝网络中，应该基于负载而不是仅仅依赖于链路质量指标来执行用户关联。
We propose a novel approach that aims at extending femtocell coverage by enabling nearby idle User Equipments (UEs) in the proximity of femtocells to serve as relays, called UE-Relays. The users that would nominally connect to macrocells are offloaded to femtocells via the coverage extension provided by the UE-Relays. The problem of determining the optimal subset of idle UEs to be enabled as UE-Relays and the user association to these relays is a non-trivial problem because it depends on the projected capacity of the relay access and backhaul.We formulate the user association as an optimization problem that maximizes the network-wide log utility of the user rates. Our simulation results corroborate our expectations: overlaying a femtocelltier with UE-Relays will increase the user throughput and the network throughput. In addition, we compare our approach with a MAX-SINR based user association, and evaluate the performance profiles at varying scenario settings. The proposed rate-based scheme outperforms the SINR-based cell selection, thus validating the idea that, in heterogeneous cellular networks, user association should be performed based on the load rather than relying merely on link quality indicators.