Patent ID: 9281930
Filing Date: 2016-03-08
CPC Classification: H04L,H04W

Claim Text:
1. A method of transmitting and receiving data in a time division duplex (TDD) for supporting multiple cells, the method performed by a base station and comprising: configuring cell groups, each of the cell groups comprises one or more cells with the same uplink-downlink (UL-DL) configuration, when a plurality of cells are configured for a user equipment (UE); performing cross cell scheduling on a second cell belonging to a different cell group from a first cell, via the first cell according to a UL-DL configuration of the first cell; checking whether a collision subframe in which a UL subframe and a DL subframe are simultaneously present occurs in a same time duration in the first cell and the second cell when performing the cross cell scheduling; performing a cross cell scheduling restriction on data transmission and reception in the collision subframe, when the collision subframe is present, wherein the cross cell scheduling is not performed on the collision subframe; and transmitting and receiving data to and from the UE, on the second cell in the collision subframe, while performing scheduling in the collision subframe via the second cell according to a UL-DL configuration of the second cell, wherein the cell groups configured for the UE are obtained by grouping cells having a difference of UL transmission timing with a specific cell configured for the UE greater than a preset value, based on a UL-DL configuration of the cells.