FIELD: radio engineering, communication.
SUBSTANCE: in a random access procedure, a downlink random access response indicates a timing advance for a component carrier or cell (CC/cell) of a plurality of component carriers or cells, or a group of CC/cells, to which the timing advance applies. The eNB or UE perform radio communication using the indicated CC/cell synchronously with the timing advance. The random access response also indicates an uplink resource granted to the user equipment, which lies on that same one or group of CC/cells. The invention may also use the explicit indication of a single bit indicating a timing advance group; the CC/cell/group index whose presence in the response is indicated by a flag bit; the CC/cell/group index in the response known from the format of the response, where the format indication is realised via a bit in the response itself or RRC signalling or implicit from the RACH and cross-carrier scheduling being configured.
EFFECT: enabling cross-scheduling during a RACH procedure.
19 cl, 12 dwg
