(At that time, the construction of 3G in the whole world gradually reached a climax. Since 2G mobile communication is relatively old, the starting point of 3G network construction is relatively higher. In 2005, it was also a critical year for 3G in my country. Major operators actively tracked 3G standards and verified 3G technology, established experimental networks and urban field experimental networks, and accumulated valuable experience in 3G technology, network construction and operation.)
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