The voltage swing of a data signal, which is supplied to a data line, is maintained to be small, thereby reducing the power consumption. The method includes: triggering, by UE, a schedule request ; and sending the SR to a base station according to configuration statuses of uplink resources of multiple carriers or carrier groups of the UE. After traversing the service provider networks, only the first-to-arrive packets are kept and the later-arriving copies are discarded. , a dislocation density below 104 cm\u22122 and an inclusion density below 104 cm\u22123 andor a MV density below 104 cm\u22123.