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Currently there is a growing demand towards interactive multi-media services using high capacity Hybrid Fiber Coaxial (HFC) networks. With regards to the realization of upstream traffic, many problems occur with the accumulation of noise due to the tree and branch architecture of the coaxial access network. We have figured out the typical network topology for the two-way HFC network, and pointed out...
Cognitive radios allow unlicensed wireless users to access channels that are in the licensed spectrum bands. However, in a wireless network with cognitive radios, when a licensed user becomes active on a channel in a certain area, nodes and links that were using that channel must release it, which will cause traffic failures. Simple and effective recovery schemes are needed to re-allocate available...
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