An electronic device of a base station, comprising: processing circuitry configured to establish a first wireless communication channel with a user equipment, determine whether a second communication channel of at least a predetermined quality exists between the user equipment and a non co-baseband base station while the first communication channel between the user equipment and the electronics device is maintained, wherein the first communication channel and the second communication channel use different carrier resources, a frequency band used by the base station is different than a frequency band used by the non co-baseband base station, wherein the processing circuitry is configured to receive from the non co-baseband base station at least one of an indication of which part of message traffic for the user equipment the non co-baseband base station is able to communicate, a preamble for random access, system information of a new carrier on which the user equipment communicates with the non co-baseband base station, and configuration information of control plane protocol for establishing communication between the user equipment and the non co-baseband base station, the processing circuitry is configured to inform the user equipment on the first communication channel of a determination that the user equipment is to establish and maintain the second communication channel with the non co-baseband base station while maintaining the first communication channel, wherein after the communication between the user equipment and the non co-baseband base station is established, the electronic device is adapted to perform intra-site carrier aggregation communication with the user equipment on multiple carriers comprising a primary carrier and a secondary carrier thereof, and wherein the primary carrier of the base station is independent from the primary carrier that the non co-baseband bases station uses for transmission of uplink control channel with the user equipment. processing circuitry configured to establish a first wireless communication channel with a user equipment, determine whether a second communication channel of at least a predetermined quality exists between the user equipment and a non co-baseband base station while the first communication channel between the user equipment and the electronics device is maintained, wherein the first communication channel and the second communication channel use different carrier resources, a frequency band used by the base station is different than a frequency band used by the non co-baseband base station, wherein establish a first wireless communication channel with a user equipment, determine whether a second communication channel of at least a predetermined quality exists between the user equipment and a non co-baseband base station while the first communication channel between the user equipment and the electronics device is maintained, wherein the first communication channel and the second communication channel use different carrier resources, a frequency band used by the base station is different than a frequency band used by the non co-baseband base station, wherein the processing circuitry is configured to receive from the non co-baseband base station at least one of an indication of which part of message traffic for the user equipment the non co-baseband base station is able to communicate, a preamble for random access, system information of a new carrier on which the user equipment communicates with the non co-baseband base station, and configuration information of control plane protocol for establishing communication between the user equipment and the non co-baseband base station, the processing circuitry is configured to inform the user equipment on the first communication channel of a determination that the user equipment is to establish and maintain the second communication channel with the non co-baseband base station while maintaining the first communication channel, wherein after the communication between the user equipment and the non co-baseband base station is established, the electronic device is adapted to perform intra-site carrier aggregation communication with the user equipment on multiple carriers comprising a primary carrier and a secondary carrier thereof, and wherein the primary carrier of the base station is independent from the primary carrier that the non co-baseband bases station uses for transmission of uplink control channel with the user equipment.