Method, system and device for uplink synchronization
First Claim
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.
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Accused Products
Abstract
A method for uplink synchronization in a multi-carrier system includes the following steps: a base station selects one or more first component carriers, which do not establish the uplink synchronization with the base station, from multiple component carriers supported by a terminal; then the base station obtains Timing Advance (TA) needed by the terminal to perform the uplink transmission on the first component carriers, and sends the TA information to the terminal; the terminal performs the uplink transmission on said first component carriers according to said TA. The application of the present invention enables the establishment of uplink synchronization between the base station and the user equipment in multi-carrier system.
77 Citations
17 Claims
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1. An uplink synchronization method in a multi-carrier system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An eNodeB, comprising:
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a synchronized carrier selecting unit configured to select 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; and an instructing unit configured to acquire a TA of the first component carrier, and transmit 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 the instructing unit is further configured to acquire the TA of the first component carrier by transmitting random access related instruction signaling including an identifier of the first component carrier to the user equipment and calculating the TA used 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, or by determining a second component carrier among the plurality of component carriers which has acquired uplink synchronization with the eNodeB and determining 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. - View Dependent Claims (9, 10, 11, 12)
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13. A user equipment, comprising:
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a command receiving unit configured to receive a TA of one or more first component carriers transmitted from an eNodeB, wherein the first component carrier is such a component carrier among a plurality of component carriers supported by the user equipment that has no uplink synchronization established with the eNodeB; an uplink transmitting unit configured to perform uplink transmission over the first component carrier according to the TA; and a random access unit configured to transmit a random access preamble to the eNodeB over the first component carrier upon reception of random access related instruction signaling, transmitted from the eNodeB, including an identifier of the first component carrier, and wherein the command receiving unit is further configured to read the TA used to perform uplink transmission over the first component carrier from a random access response transmitted from the eNodeB upon reception of the random access response. - View Dependent Claims (14, 15, 16, 17)
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Specification