Research on mmWave mesh networking for Ultra Dense Network (UDN) in 5G communication systems is still an open problem. We study the networking mechanisms, algorithms and protocols for UDN based on mmWave communications. The target of our research is to design a set of mmWave mesh networking solutions for UDN.
With the emergence of applications such as virtual reality and augmented reality, current mobile communication network is increasingly unable to meet people's needs. Thus, network densification has become an important means to increase network capacity. To densely deploy small base stations at sites, it is necessary to find a low-cost, quick-to-deploy, and easy-to-use backhaul solution. 
In recent years, network densification has become the trend of cellular network development. Connecting densely deployed small cells via optical fiber leads to high cost, and cannot achieve flexible networking. Therefore, it is critical to use mmWave for wireless backhaul networks. In an ultra-dense network, it is challenging to develop a flexible, efficient, and reliable routing mechanism for wireless backhaul network.
Nowadays video streaming and social network data has dominated the traffic volume in networks, which leads to the sever congestion. Thus, it is significant to introduce the content delivery network design to 5G networks for the alleviation of network congestion. The recently proposed coded caching scheme highly reduces the latency in networks. However, the heterogeneous data links in wireless networks affect the efficiency of coded caching.
Full-Duplex Wireless Communication has the potential to reform the wireless communication in many aspects and it is really an exciting area for both academia and industries.
So far, full-duplex communications have become practical. For a link between a pair of nodes, full-duplex communications can nearly double the spectrum efficiency, and thus significantly improve the network performance. However, in multi-hop wireless networks such as mesh networks, mutual interference degrades performance of full-duplex communications, so high throughput gain cannot be always achieved unless full-duplex links can be efficiently established and managed.

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