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对于分组数据业务来说 ,如果用户有一个良好的连接 ,则蜂窝的频谱效率和数据速率都会得到长足的提高 ,全世界所有的蜂窝标准都利用了这一点来进行数据速率自适应 ,文中就以下几种系统描述数据速率自适应过程 :CDMA (IS - 95 ) ,宽带CDMA (CDMA2 0 0 0和UMTSCDMA) ,TDMA (IS - 136 )和GSM (GPRS和EDGE) ,并探讨一些尚待解决的问题
For packet data services, the spectral efficiency and data rate of the cell will be greatly improved if the user has a good connection and this is exploited by all cellular standards throughout the world for data rate adaptation. The following text Several systems describe data rate adaptation processes: CDMA (IS-95), Wideband CDMA (CDMA2000 and UMTSCDMA), TDMA (IS-136) and GSM (GPRS and EDGE) and discuss some issues that remain unresolved