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Coordinated multipoint in dense heterogeneous networks with overlapping microcell expanded regions and its effect on backhaul links

机译：具有重叠的微小区扩展区域的密集异构网络中的协调多点及其对回程链路的影响

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摘要

One of the goals of Heterogeneous Networks (HetNets) is to offload traffic from the macrocell BS to the microcell base stations (BSs). It has been proposed that in order for the microcell to acquire more users and offload increasing amounts of traffic, its region of coverage must be expanded. This however causes significant cross-tier interference, which can be remedied by utilizing coordinated multipoint (CoMP) within the microcell expanded region (ER). Our methodology considers the effect of overlapping ERs, and proposes the cooperation of concerned microcell BSs with the macrocell BS to further reduce the outage probability and improve throughput. Another important consideration in our analysis is the effect of having non-ideal backhaul on the system’s performance. That is, CoMP increases the strain on the backhaul network, since additional data that is proportional to the number of cooperating BSs needs to travel on the backhaul links. Furthermore, the delay should be minimal and less than one subframe duration in order for reported channel state information to remain valid. With this in mind, our proposed system considers the effect of having non-ideal backhaul in a cellular network with CoMP, while taking into account overlaps in the microcell ERs.
机译：异构网络（HetNets）的目标之一是将流量从宏小区BS卸载到微小区基站（BS）。已经提出，为了使微蜂窝小区获得更多的用户并减轻增加的业务量，必须扩大其覆盖范围。但是，这会导致严重的跨层干扰，可以通过在微蜂窝扩展区域（ER）中利用协作多点（CoMP）来解决。我们的方法考虑了重叠ER的影响，并提出了相关的微蜂窝基站与宏蜂窝基站的合作，以进一步降低中断概率并提高吞吐量。我们分析中的另一个重要考虑因素是非理想回程对系统性能的影响。即，CoMP增加了回程网络上的压力，因为与协作的BS的数量成比例的附加数据需要在回程链路上传播。此外，该延迟应该是最小的并且小于一个子帧持续时间，以便报告的信道状态信息保持有效。考虑到这一点，我们提出的系统考虑了在具有CoMP的蜂窝网络中进行非理想回程的影响，同时考虑了微蜂窝ER中的重叠。

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