Cooperative Scheduling of Downlink Beam Transmissions in a Cellular Network
Cooperative Scheduling of Downlink Beam Transmissions in a Cellular Network
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DOI：
10.1109/glocomw.2008.ecp.79
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发表时间：
2008-11
期刊：
影响因子：
--
通讯作者：
Patrick Hosein
中科院分区：
文献类型：
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作者：
Patrick Hosein
下一代无线网络（例如）将使用多种技术来提高信道频谱效率。在本文中，我们重点研究了一种这样的技术，波束形成，在下行信道。在每个扇区都有若干固定波束为用户服务。对于每个帧，调度程序选择一个波束，然后调度位于该波束内的一个或多个移动设备。由于基站的功率集中在窄波束上，因此服务用户可以获得更高的速率，并且扇区覆盖率也增加了。然而，这种光束在相邻扇区造成更多的干扰。如果相邻扇区调度位于波束覆盖范围内的用户，则该用户的可实现速率将很低。因此邻近的扇区必须调度波束外的用户。这需要各部门之间的协调。在本文中，我们假设每个扇区与正对面的扇区坐标。我们提供了一个框架，并展示了需要交换的信息，以及每个基站中的调度器如何使用交换的信息来调度用户，以避免波束冲突。这必须以高频谱效率和用户公平为目标来完成。我们将我们的方法与一种简单的、非协调的方法进行比较，以说明协调提供的优势。
The next generation of wireless networks (e.g.,) will use multiple techniques to improve channel spectral efficiencies. In this paper we focus on one such technique, beamforming, in the downlink channel. In each sector a number of fixed beams are used to serve users. For each frame the scheduler chooses a beam and then schedules one or more mobiles that lie within that beam. Since the basestation's power is focused on a narrow beam then the served users can achieve higher rates and the sector coverage is also increased. However, this beam causes more interference in adjacent sectors. If a neighboring sector schedules a user that lies within the coverage of the beam then the achievable rate for that user will be low. The neighboring sectors must therefore schedule users outside of the beam. This requires coordination among the sectors. In this paper we assume that each sector coordinates with the sector that lies directly opposite. We provide a framework and show what information needs to be exchanged and how the schedulers in each base station uses the exchanged information to schedule users so that beam collisions are avoided. This must be done with the objectives of high spectral efficiencies and also user fairness. We compare our approach with a simple, non-coordinated approach to illustrate the advantages that coordination provides.