Evolving the underlying networks to support a mass market, however, presents a number of challenges: Spectrum is a limited resource; CDMA standards have sub-optimal spectral efficiency; layered 3G network architectures are not conducive to low-latency ser
Evolving the underlying networks to support a mass market, however, presents a number of challenges: Spectrum is a limited resource; CDMA standards have sub-optimal spectral efficiency; layered 3G network architectures are not conducive to low-latency ser
但开发基本网络以满足广大市场，仍面临几大挑战：频谱资源有限、CDMA标准的光谱效率未达最优、分层3G网络架构未能实现即时服务、及容量增大的智能天线或多天线系统仍不尽人意。