Patent ID: 8811433
Filing Date: 2014-08-19
Classification: H04L,H04W

Abstract:
1. An uplink synchronization method in a multi-carrier system, comprising: selecting, by an eNodeB, one or more first component carriers which have not acquired uplink synchronization with the eNodeB from a plurality of component carriers supported by a user equipment; acquiring, by the eNodeB, a Timing Advance, TA, of the first component carrier; and transmitting, by the eNodeB, the TA of the first component carrier to the user equipment to instruct the user equipment to perform uplink transmission over the first component carrier according to the TA, wherein acquiring by the eNodeB the TA of the first component carrier in the following first approach or second approach: in the first approach, the eNodeB transmits random access related instruction signaling which includes an identifier of the first component carrier to the user equipment, and the eNodeB calculates the TA for the user equipment to perform uplink transmission over the first component carrier upon reception of a random access preamble transmitted from the user equipment to the eNodeB over the first component carrier; and in the second approach, the eNodeB determines a second component carrier among the plurality of component carriers which has acquired uplink synchronization with the eNodeB and determines a TA used to perform uplink transmission over the second component carrier as the TA used to perform uplink transmission over the first component carrier.