Patent ID: 8488560

Claim:
A random access method, comprising: receiving, by a target evolved Node B (eNB), a handover request message sent by a source eNB, wherein the handover request message comprises information of at least one target component carrier selected by the source eNB, and each of the at least one target component carrier is a carrier to which a User Equipment (UE) is to be handed over; determining, by the target eNB, whether to allow the at least one target component carrier selected by the source eNB; sending, by the target eNB, a handover request acknowledgement message to the source eNB, wherein the handover request acknowledgement message comprises information about at least one determined target component carrier for the UE, wherein: if the at least one target component carrier selected by the source eNB is allowed by the target eNB, the at least one determined target component carrier is the at least one target component carrier selected by the source eNB, and if the at least one target component carrier selected by the source eNB is not allowed by the target eNB, the at least one determined target component carrier is at least one newly configured target component carrier configured by the target eNB; sending, by the source eNB, the at least one determined target component carrier to the UE through a handover command; receiving, by the target eNB, a dedicated random access preamble sent by the UE; and sending, by the target eNB, a random access response message on a component carrier in the at least one determined target component carrier.