FIELD: physics, communication.
SUBSTANCE: invention relates to facilities to return ACK/NACK information of aggregation of carriers. A common field is configured, present in DCI, as at least one type of command fields, related to return of ACK/NACK, from at least two types of command fields, related to return of ACK/NACK, where the common field may be configured as command fields related to return of ACK/NACK. The common field is configured in at least one part of DCI, transferred by means of a component carrier downlink connected to the system, as the command field for control of transmission power, TPC, and the common field is configured in at least one part of DCI sent by means of a component carrier downlink not connected to the system, as a command field of ARI for indication of ACK resource. DCI is sent to user equipment, so that the user equipment returns information of ACK/NACK according to DCI.
EFFECT: technical result consists in provision of back compatibility of carrier aggregation.
12 cl, 10 dwg
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