Patent ID: 9648637
Date: 2017-05-09
CPC Classifications: H04L,H04W

Claim:
1. A method for transmitting, by a base station to a user equipment configured with a plurality of serving cells, downlink data, the method comprising: transmitting, by the base station, a physical downlink control channel (PDCCH) carrying a downlink grant for a scheduled cell, which is one of the plurality of serving cells, through a scheduling cell among the plurality of serving cells; and transmitting, by the base station, a physical downlink shared channel (PDSCH) carrying the downlink data through the scheduled cell according to the downlink grant, wherein the user equipment is configured at least a primary cell (PCell) group and a secondary cell (SCell) group, wherein the PCell group is configured with a PCell and zero or more SCells among the plurality of serving cells, and the SCell group is configured with one or more SCells not belonging to the PCell group among the plurality of serving cells, and wherein the scheduled cell belongs to the PCell group when the scheduling cell belongs to the PCell group, and the scheduled cell belongs to the SCell group when the scheduling cell belongs to the SCell group.