第三代移动通信系统具有容量大，功耗低，通话质量高和保密性好等优点。
The third generation mobile communications systems have the advantage of large capacity, low consumed power, fine voice quality and confidentiality.
它具有通信容量大、辐射功率密度低、抗多径干扰、结构简单、保密性能优良等特点。
It has the following features, such as large communication capacity, low radiation power density, good ability against Multi-path interference, simple structure and excellent security performance.
它不仅限制了ATN的容量及其进一步扩展，而且也不能支持安全性、保密性和组播技术。
It not only limits the capacity of ATN and its further improvement, but also can't support the security, privacy and multicast technology.
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