TD-SCDMA system is difficult to support different radio access data rates,such as vehicular environment: 144 kbit/s,pedestrian environment: 384 kbit/s,indoor office environment: 2.048 Mbit/s,which are required by 3G standards.

• TD-SCDMA标准很难提供3G标准所规定的在车载、步行、静止环境下分别达到144 kb it/s、384 kb it/s和2 048 kb it/s的无线接入速率要求。