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LTE系统中的干扰管理技术研究
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摘要
LTE系统的规模化网络部署给无线通信带来了新的干扰问题,其中不仅包括LTE系统内部的小区间干扰,也包括与其它系统共存时的干扰。这些干扰都直接影响着LTE系统的性能,甚至影响着与LTE系统共存的其它通信系统的性能。如何有效的解决干扰问题关系着LTE系统的进一步发展。
     本文围绕着LTE系统中的干扰管理技术做了深入细仔的研究。主要从以下三个方面展开:LTE系统中的干扰协调技术、多小区协作模式下的干扰管理和TD-LTE系统与TD-SCDMA系统共存场景下的干扰管理。本文的主要贡献和内容如下:
     首先,详细分析了LTE系统中存在的干扰类型和形成原因。对LTE系统中的小区间干扰做了重点分析,对TD-LTE系统中特有的交叉时隙干扰做了深入研究。使用系统级仿真的方法研究了交叉时隙干扰对TD-LTE系统性能的影响程度,分别给出了不同调度方式下,受交叉时隙干扰影响的TD-LTE系统吞吐量下降曲线。
     其次,在总结目前干扰协调技术的基础上,提出了一种基于部分频率复用网络下的小区间协作干扰协调方法。新方法采用了全协作模式,重点考虑了协作基站选择问题和协作用户选择问题,仿真结果表明新方法提高了系统的吞吐量,特别是处于小区边缘位置的用户性能得到了较大的提升。
     第三,研究了多小区协作网络中的用户选择和功率分配问题。在基于协作资源分配的网络模式下,提出了一种保证用户QoS的资源分配方法,包括用户选择和功率分配。仿真结果表明新方法提高了系统性能,保证了用户的服务质量,降低了用户在用业务的中断概率。
     第四,针对TD-LTE系统和TD-SCDMA系统共存的特定场景,使用确定性分析方法分析了系统间各种类型的干扰,得出了各种干扰对系统隔离度的要求指标,并且给出了不同天线架设方式下系统天线所需的隔离距离。
     第五,使用系统级仿真方法研究了TD-LTE系统和TD-SCDMA系统共存问题,得出了TD-LTE系统基站和TD-SCDMA系统基站之间的邻道干扰对两系统性能造成下降的相对值。
     第六,将TD-LTE系统和TD-SCDMA系统之间的干扰问题转化为带约束条件的数学优化问题,使用最优化的方法求出了该问题的理论最优解。提出一种适合系统共存环境下使用的LTE系统频率分配方法。该方法尽可能的减少了系统间的干扰,增加了系统性能。仿真结果显示新的方法提高了TD-LTE系统的吞吐量,同时也降低了TD-SCDMA系统的掉话率。
The wide deployment of LTE system brings new interference problem to wireless communication, including not only inter-cell interference within the LTE system, but also inter-system interference when it is co-existent with other wireless communication systems. All these interference degrades the performance of LTE system directly, as well as that of other co-existent system. How to solve the interference problem affects the further development of LTE system.
     In this thesis, we investigate on the interference management technologies for LTE systems. Our research focuses on three parts, i.e., the interference coordination in a LTE system, the interference management in a MCP (Multi-cell Cooperation Processing) network, and the interference management when a TD-LTE system is co-existent with a TD-SCDMA system. The main contributions of this thesis can be summarized as:
     Firstly, we analyse the interference types and their formation reasons in LTE systems, especially analyse the inter-cell interference in LTE systems and the cross-slot interference, which only appears in TD-LTE systems. Via the system simulation, we get the performance degradation level of TD-LTE system, which is caused by cross-slot interference. Some corresponding curves of system throughput based on different scheduling schemes are also presented.
     Secondly, based on the summary of existing interference coordination technologies, we proposed a new MCP interference coordination scheme which can be used in FFR (Fractional Frequency Reuse) network. The new method uses full-coorperation mode, and focuses on the selection of coorperative user and coorperative base sation. Simulaton results show that the proposed method improves the system throughput, and promotes the performance of cell edge users siganificantly.
     Thirdly, study on the users'selection and the power allocation problem in the multiple cell processing network. Based on the cooperative resource allocation network, we proposed a new resource allocation scheme with QoS guaranteed, including users'selection and power allocation. Simulation results show that the new scheme improves system performance, ensures user's QoS and reduces outage.
     Forthly, different types of inter-system interference in the co-existance scenario of TD-LTE system and TD-SCDMA system are analysised by using MCL method. The isolation requirement of different interference is given out, and isolation distance with different antenna installation method is also given out.
     Fifthly, co-existence interference between TD-LTE system and TD-SCDMA sysem is studied by using system simulation method. The relative value of performance decrease of both of the systems which is caused by adjacent channel interference between TD-LTE BS and TD-SCDMA BS is obtained.
     Sixthly, the inter-system interference between a TD-LTE system and a TD-SCDMA system is studied in a mathematic optimization problem with constraint, and the optimal solution is derived by using a convex optimization method. A new frequency allocating method of LTE system which suits for co-existance scenario is proposed. The proposed method reduces the inter-system interference and improves the system performance. The simulation results show that the proposed method improves the thoughput of LTE system and reduces the outage of TD-SCDMA system simutaneously.
引文
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