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Licensed and Unlicensed Spectrum Allocation in Heterogeneous Networks

机译:异构网络中的许可和未许可频谱分配

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摘要

In future networks, an operator may employ a wide range of access pointsusing diverse radio access technologies (RATs) over multiple licensed andunlicensed frequency bands. This paper studies centralized user association andspectrum allocation across many access points in such a heterogeneous network(HetNet). Such centralized control is on a relatively slow timescale to allowinformation exchange and joint optimization over multiple cells. This is incontrast and complementary to fast timescale distributed scheduling. A queueingmodel is introduced to capture the lower spectral efficiency, reliability, andadditional delays of data transmission over the unlicensed bands due tocontention and/or listen-before-talk requirements. Two optimization-basedspectrum allocation schemes are proposed along with efficient algorithms forcomputing the allocations. The proposed solutions are fully aware of trafficloads, network topology, as well as external interference levels in theunlicensed bands. Packet-level simulation results show that the proposedschemes significantly outperform orthogonal and full-frequency-reuseallocations under all traffic conditions.
机译:在未来的网络中,运营商可能会在多个许可和非许可频段上使用各种无线电接入技术(RAT)来使用各种接入点。本文研究了这种异构网络(HetNet)中跨多个接入点的集中用户关联和频谱分配。这样的集中控制在相对慢的时间尺度上,以允许在多个小区上的信息交换和联合优化。这与快速的时标分布式调度相反。引入队列模型来捕获较低的频谱效率,可靠性以及由于争用和/或通话前监听要求而导致的非授权频段上数据传输的其他延迟。提出了两种基于优化的频谱分配方案以及用于分配的有效算法。所提出的解决方案完全了解流量负载,网络拓扑以及免许可频段中的外部干扰级别。数据包级仿真结果表明,所提出的方案在所有流量条件下均明显优于正交和全频重用分配。

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