GSM的三个阶段分别是PHASEⅠ,主要定义了900M频段的技术标准;PHASEⅡ标准,除了对PHASE I 标准进行必要的修正和业务补充外,主要增加了1800M频段的技术标准;PHASEⅢ标准,定义了2000M频段的技术标准。
GSM的三个阶段分别是PHASEⅠ,主要定义了900M频段的技术标准;PHASEⅡ标准,除了对PHASE I 标准进行必要的修正和业务补充外,主要增加了1800M频段的技术标准;PHASEⅢ标准,定义了2000M频段的技术标准。
参考答案和解析
PHASE Ⅰ,主要定义了900M频段的技术标准;PHASE Ⅱ 标准,除了对PHASE I 标准进行必要的修正和业务补充外,主要增加了1800M频段的技术标准;PHASE Ⅱ +标准,主要增加了GPRS部分的内容
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