These cooperations are facilitated by dynamically and opportunistically assigning one of the secondary users as a relay to assist the other one, which results in more efficient spectrum hole detection. Also, we investigate the impact of erroneous

这里面有3篇关于tcp如何打洞建立p2p连接的文章，介绍了原理，也有实例的代码。-There are three articles to establish p2p connection on tcp how holes, introduced the principle, there are also instances of code.

Sparse Reconstruction-based Detection of Spatial Dimension Holes in Cognitive Radio Networks