2005 IEEE
这是一个典型的Ad hoc场景。紧急情况下的临时自组网络。虽然之前的论文中把它标记为out-of-band global coverage，但这个也是分组的，每个组有个gateway。
核心采用了Spectrum Pooling，Distributed Spectrum Assignment。
“Spectrum pooling serves as a physical layer signalling
for detection of primary users, while DCA serves as a scheme
for data exchange and signalling on the network layer.”
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