A method and apparatus are disclosed for changing Time Division Duplex (TDD) Uplink (UL)-Downlink (DL) configuration. According to one embodiment, the method includes receiving by the UE a signaling for TDD UL-DL reconfiguration and changes from an old TDD UL-DL configuration to a new TDD UL-DL configuration. The method further includes considering by the UE before a specific timing that a number of Physical Hybrid ARQ Indicator Channel (PHICH) groups is determined by the old UL-DL configuration at least for overlapped non-UL subframes between the new TDD UL-DL configuration and the old TDD UL-DL configuration.