This standard mainly specifies the classification and power level, business, functional requirements, performance requirements, interface requirements, power consumption performance requirements, audio, interface, reliability, electromagnetic compatibility, Specific absorption rate, battery and charger requirements, etc. This standard applies to TD-SCDMA digital cellular mobile communication network downlink packet access (HSDPA) terminals. For HSDPA-related requirements, terminals that support single-carrier HSDPA functions are required. R5 terminals can work normally in R4 networks.