In a 5G integrated backhaul and access (IAB) network, an IAB-donor and multiple IAB-nodes form a multi-hop wireless backhaul network. When a terminal is connected to an IAB-node, the traffic flows generated by the terminal can be backhauled to the IAB-donor. Due to the mobility of terminals, access links are error-prone and cause difficulty in ensuring end-to-end quality of service (QoS) of traffic flows. To improve access link reliability, multi-connectivity is considered in IAB, i.e., a terminal is connected to multiple IAB-nodes. However, to ensure end-to-end QoS, multi-connectivity must be considered together with multi-hop backhauling. Thus, an effective-capacity based resource allocation (eReal) scheme is developed to establish end-to-end multi-connectivity. The objective of the scheme is to guarantee end-to-end QoS and ensure outage probability is below the given threshold. Since traffic flows are classified into the guaranteed bit rate (GBR) and the non-GBR types, the scheme is formulated as two joint route selection and resource allocation problems to provide differentiated services with minimum resource consumption. Since both problems are NP-hard, they are solved using column generation. Performance results show that eReal serves various traffic flows with over 95% QoS guarantees and also significantly outperforms existing schemes.

中文翻译：

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5G IAB 网络中端到端多连接的基于有效容量的资源分配


在5G集成回程和接入（IAB）网络中，一个IAB施主和多个IAB节点形成多跳无线回程网络。当终端连接到IAB节点时，终端生成的业务流可以回程到IAB施主。由于终端的移动性，接入链路容易出错，难以保证端到端的业务流质量。为了提高接入链路的可靠性，IAB中考虑了多连接性，即一个终端连接多个IAB节点。然而，为了确保端到端的QoS，必须同时考虑多连接和多跳回程。因此，开发了一种基于有效容量的资源分配（eReal）方案来建立端到端的多连接。该方案的目标是保证端到端的QoS并确保中断概率低于给定的阈值。由于业务流被分为保证比特率（GBR）和非GBR类型，因此该方案被制定为两个联合路由选择和资源分配问题，以最小的资源消耗提供差异化​​服务。由于这两个问题都是 NP 难题，因此可以使用列生成来解决。性能结果表明，eReal 可以为各种流量提供超过 95% 的 QoS 保证，并且显着优于现有方案。