Random access method, evolved node B, and terminal equipment

A random access method, comprising:

• receiving a handover command sent by a source evolved Node B (eNB), wherein the handover command comprises information about at least one target component carrier configured by a target eNB having multiple component carriers or selected by the source eNB, and the at least one target component carrier is a carrier to which a User Equipment (UE) is to be handed over, and the at least one target component carrier is included in the multiple component carriers;
• after sending a dedicated random access preamble to the target eNB, receiving a random access response message on at least one downlink target carrier in the at least one target component carrier;
• and
• after the receiving the random access response message, the method further comprises:
• sending a handover acknowledgement message to the target eNB, and receiving at least one of the following elements:
• a new uplink target component carrier, a new downlink target component carrier, a new uplink and downlink target component carrier pair allocated by the target eNB for the UE;
• receiving a component carrier handover command sent by the target eNB, wherein the component carrier handover command comprises information about a component carrier or a component carrier pair re-selected, and the component carrier or the component carrier pair re-selected is a carrier or a carrier pair to which the UE is to be handed over;
• handing over the UE to the component carrier or the component carrier pair re-selected;
• and
• transmitting data on the component carrier or the component carrier pair re-selected after handover.

A terminal equipment, comprising:

• a handover command receiving unit, configured to receive a handover command sent by a source evolved Node B (eNB), wherein the handover command comprises information about at least one target component carrier configured by a target eNB having multiple component carriers or selected by the source eNB, and the at least one target component carrier is a carrier to which a User Equipment (UE) is to be handed over, and the at least one target component carrier is included in the multiple component carriers;
• a sending unit, configured to send a dedicated random access preamble to the target eNB after the handover command receiving unit receives the handover command;
• a random response receiving unit, configured to receive a random access response message on at least one downlink component carrier in the at least one target component carrier after the sending unit sends the dedicated random access preamble;
• a component carrier receiving unit, configured to receive at least one of:
• a new uplink target component carrier, a new downlink target component carrier, a new uplink and downlink target component carrier pair allocated by the target eNB, after a handover acknowledgement message is sent to the target eNB;
• a receiving unit, configured to receive a component carrier handover command sent by the target eNB, wherein the component carrier handover command comprises information about a component carrier or a component carrier pair re-selected, and the component carrier or the component carrier pair re-selected is a carrier or a carrier pair to which the UE is to be handed over;
• a handover unit, configured to hand over the UE to the component carrier or the component carrier pair re-selected;
• and
• a transmission unit, configured to transmit data on the component carrier or the component carrier pair re-selected after handover.

A random access method, comprising:

• determining at least one target component carrier to which a User Equipment (UE) is to be handed over, and notifying the UE of information about the at least one target component carrier through a source evolved Node B (eNB);
• and
• after receiving a dedicated random access preamble sent by the UE, sending a random access response message on at least one component carrier in the at least one target component carrier;
• after receiving a handover acknowledgement message sent by the UE, allocating at least one of the following elements to the UE:
• a new uplink component carrier, a new downlink component carrier and a new component carrier pair;
• wherein when a target eNB including multiple component carriers is required to re-select at least one of the following elements for the UE:
• a new uplink component carrier, a new downlink component carrier and a new component carrier pair, the method further comprises:
• sending a component carrier handover command to the UE, wherein the component carrier handover command comprises information about the at least one of the elements re-selected, to which the UE is to be handed over;
• and
• transmitting data on the at least one of the elements re-selected for the UE after completing the component carrier handover.

An evolved Node B (eNB) including multiple component carriers, the eNB comprising:

• a determination unit, configured to determine at least one target component carrier to which a User Equipment (UE) is to be handed over;
• a notification unit, configured to notify the UE of information about the at least one target component carrier through a source eNB;
• a sending unit, configured to send a random access response message on at least one component carrier in the at least one target component carrier after a dedicated random access preamble sent by the UE is received;
• means for allocating at least one of the following elements to the UE:
• a new uplink component carrier, a new downlink component carrier and a new component carrier pair after receiving the handover acknowledgement message sent by the UE;
• and
• wherein when the eNB is required to re-select at least one of the following elements for the UE:
• a new uplink component carrier, a new downlink component carrier and a new component carrier pair, the eNB further comprises:
• a handover command sending unit, configured to send a component carrier handover command to a UE, wherein the component carrier handover command comprises information about the at least one of the elements re-selected, to which the UE is to be handed over, and
• a data transmission unit, configured to transmit data on the at least one of the elements re-allocated after completing the component carrier handover.