域间资源共享和安全互操作带来的安全性问题受到人们的广泛关注。
Security problems brought about by resource sharing and security interoperability between domains have captured people's attention.
对于域间路由、IP多播、P 2 P文件共享等问题，这个假设并不成立。
However this supposition does not come into existence in such problems as domain routing, IP Multicast, P2P file sharing etc.
现有的OFDMA资源分配算法大都以提高单系统内的频谱利用率为目标，而对于同一区域内多系统间的资源共享问题未加考虑。
Most of the current OFDMA resource allocation algorithms targets on the spectrum utilization improvement in single system without considering the resource sharing for multisystem in the same area.
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