论文部分内容阅读
目前,无线移动通信正处于推陈出新的时代。为了满足日益激增的对移动通信非话业务的需求,电信设备供应商和运营商正在对现有的第二代移动通信网络,如GSM、IS-95 CDMA等,进行技术上的革新和改造。对于GSM系统,可以采用GPRS(General Packet Radio Services)技术来提供无线分组交换数据业务,所支持的分组数据速率可达到115kbps。GSM发展的可能发展阶段是 EDGE(Enhanced Data Rates for GSMEvolution),可支持高达384kbps的业务,然后将过渡到第三代移动通信系统WCDMA。对于IS-95 CDMA系统,已在1999年6月通过了IS-2000标准(IS-2000/cdma2000 IX),其
At present, wireless mobile communication is in an era of innovation. To meet the ever-increasing demand for non-voice services for mobile communications, telecom equipment providers and operators are making technological innovations and improvements to existing second-generation mobile communications networks such as GSM and IS-95 CDMA. For the GSM system, GPRS (General Packet Radio Services) technology can be used to provide wireless packet switched data services, supporting packet data rates up to 115kbps. The possible development phase of GSM development is EDGE (Enhanced Data Rates for GSMEvolution), which can support services up to 384 kbps, and will then transition to the third generation mobile communication system WCDMA. For the IS-95 CDMA system, the IS-2000 standard (IS-2000 / cdma2000 IX) was adopted in June 1999, which