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Context-aware handover management for HetNets: Performance evaluation models and comparative assessment of alternative context acquisition strategies

机译：关于Hetnets的背景信息切换管理：绩效评估模型和替代语境收购策略的比较评估

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摘要

The management of Vertical Handovers (VHO) in a heterogeneous networks (HetNet) environment has received considerable attention, with the aim of enabling effective, context-aware network selections. Various relevant architectures and frameworks have been proposed, but the available methodologies for evaluating the performance of these proposals and for comparing alternatives are still limited. In addressing this issue, the paper contributes a versatile modeling methodology that focuses on signaling in the handover preparation phase and incorporates all significant effects that are associated with the exchange, queueing and processing of the signaling messages and have an impact on delay-related performance. The resulting model is comprehensive, yet capable of admitting closed form solutions. Even more importantly, the methodology is generic and can be flexibly tailored to different VHO architectures. To demonstrate this feature, the paper applies the modeling methodology in two context-aware VHO approaches that differ in the way of acquiring dynamic resource availability context. The first approach is according to standards-based recommendations (such as the IEEE 802.21 Media Independent Handover Function (MIHF) and the 3GPP Access Network Discovery and Selection Function (ANDSF)) and obtains resource availability context reactively, each time a handover is triggered, through interaction between the sewing network (SN) and every candidate network (CN). The other approach aligns with recent research directions and introduces a local context repository that gathers proactively, in a periodical fashion, the resource availability context from the various Radio Access Networks (RANs) associated with this repository, reducing the signaling overhead and enabling a potentially prompter discovery of a proper network target. For both approaches, the model-based results are validated against simulations, confirming the effectiveness and the accuracy of the modeling methodology. Furthermore, the model-based results enable a direct performance comparison of the two approaches, demonstrating that the proactive architectural approach can provide significant performance and processing efficiency gains, in comparison to the reactive approach.
机译：异构网络（HetNet）环境中的垂直切换（VHO）的管理受到了相当大的关注，目的是实现有效的上下文感知网络选择。已经提出了各种相关架构和框架，但可用的可用方法评估这些提案的表现和比较替代品的绩效仍然有限。在解决此问题时，该文件贡献了一种多功能建模方法，其专注于切换准备阶段中的信令，并结合了与发信号传递消息的交换，排队和处理相关联的所有显着效果，并且对延迟相关性能产生影响。由此产生的模型全面，但能够承认封闭式解决方案。更重要的是，该方法是通用的，可以灵活地量身定制到不同的VHO架构。为了演示此功能，本文在两个上下文中的VHO方法中应用了所不同的方法，这些方法在获取动态资源可用性上下文的方式不同。第一种方法是根据基于标准的建议（例如IEEE 802.21媒体独立的切换功能（MIHF）和3GPP接入网络发现和选择功能（ANDSF））并在每次触发切换时获得资源可用性上下文，通过缝纫网络（SN）与每个候选网络（CN）之间的相互作用。另一个方法与最近的研究方向对齐，并引入本地上下文存储库，以与与此存储库相关联的各种无线电接入网络（RANS）的周期性，资源可用性上下文进行主动收集，从而减少信令开销并启用潜在的提出发现适当的网络目标。对于这两种方法，基于模型的结果验证了模拟，确认了建模方法的有效性和准确性。此外，基于模型的结果使得两种方法的直接性能比较，表明主动架构方法可以与反应方法相比，主动架构方法可以提供显着的性能和处理效率。

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