Method, device and system for determining uplink carrier resource

The invention discloses a method for determining an uplink carrier resource. The method comprises the following steps that: a base station allocates a special random access leader sequence for noncompetitive random access to user equipment, determines a downlink member carrier for transmitting the special random access leader sequence to the user equipment, and transmits the special random access leader sequence to the user equipment through the determined downlink member carrier; and the base station obtains an uplink member carrier used by the user equipment to transmit the special random access leader sequence according to the determined downlink member carrier and a binding relation between the preconfigured downlink member carriers/uplink member carriers, and receives the special random access leader sequence on the uplink member carrier. The invention also discloses another method, another device and another system for determining the uplink carrier resource. The method, the device and the system can be used for a multi-carrier aggregation system to fill the gap of the prior art.