Third-generation wireless

摘要

There seems to be almost universal agreement that CDMA technology will form the third-generation radio interface. The IMT-2000 ITU initiative provides requirements to be met by any technology to ensure that multimedia can be supported along with traditional voice services. It is almost certain that a universal third-generation standard would have to support at least 2 different spectrum bands. IMT-2000 provides a real opportunity for international cooperation between carriers and vendors. As the demand for international roaming increases, the demand for one phone that works everywhere also will increase. It is almost certain that the base technology of this phone will be 5MHz, 10MHz or 20MHz CDMA. If it is to work both in traditional GSM regions and traditional AMPS regions, it will have to support both network protocols. A risk is that the third-generation technology will try to provide too many disparate services and become bogged down by complexity and high costs.