Cooperation and cognition in heterogeneous wireless networks

随着无线数据流量的增加，对蜂窝网络中有限的带宽资源造成了很大的压力，工业界和学术界的研究人员都在寻找提高可靠性和吞吐量的方法。这导致了异构网络范式的发展。在异构网络中，无线接入由诸如微小区、皮科和毫微微小区的各种网络拓扑提供。传统的蜂窝基础设施只能作为最后的手段使用。关键是使接入点靠近用户，从而节省功耗，但更重要的是，带宽重用。 虽然是一个直观的概念，异构网络提出了许多困难的实践和理论问题，迄今为止，还没有得到回答。我们要回答的关键问题是这些网络共存的能力、资源分配和可扩展性。此外，我们计划在设计和分析中使用一类新的网络：移动的接入点。 到目前为止提到的异构网络是分层的，必须共享有限的可用带宽资源。在下一代网络的上下文中，可能基于正交频分多址（OFDMA），特别是长期演进（LTE）类标准，资源分配包括跨网络分配物理资源块（PRB）和确定传输功率电平。资源分配问题是异构网络中的一个基本限制因素，找到高效和有效的解决方案将是本项目的关键驱动因素。我们将调查的可扩展性的背景下，节点之间的合作问题，可扩展性和资源分配。我们将研究认知来解决这些问题。此外，我们将研究由于延迟和对有线回程的影响而导致的跨层设计。

As increased wireless data traffic has placed great strain on the limited bandwidth resources in cellular networks, both industry and academic researchers have searched for means to improve reliability and throughput. This has led to the development of the paradigm of heterogeneous networks. In heterogeneous networks, wireless access is provided by a wide variety of network topologies such as micro-, pico- and femto-cells. The traditional cellular infrastructure is accessed only as a last resort. The key is to bring the access point close to the user, leading to savings in power used, but more importantly, in bandwidth reuse. While an intuitive concept, heterogeneous networks raise many difficult practical and theoretical questions that have, so far, been unanswered. Key questions that we aim to answer are the ability of these networks to co-exist, resource allocation and scalability. In addition, we plan to bring into the design and analysis the use of a new class of networks: mobile access points. The heterogeneous networks mentioned so far are hierarchical and must share the limited bandwidth resources available. In the context of the next-generation of networks, likely based on orthogonal frequency division multiple access (OFDMA) - especially, the Long Term Evolution (LTE) class of standards, resource allocation includes both allocating physical resource blocks (PRBs) across networks and determining transmission power levels. The resource allocation problem is a fundamental limiting factor in heterogeneous networks and finding efficient and effective solutions will be a key driver in this project. We will investigate issues of cooperation amongst nodes, handoffs and resource allocation in the context of scalability. We will investigate cognition to address these issues. Furthermore, we will investigate cross-layer designs due to latency and the impact on the wired backhaul.