Method and apparatus for generating a reference signal sequence in a wireless communication system

A base station comprising:

• a radio frequency (RF) unit;
• and
• a processor coupled to the RF unit, and configured to:
• control the RF unit to transmit a cell-specific group hopping parameter to a plurality of user equipments (UEs) in a cell, wherein the cell-specific group hopping parameter is used to disable a group hopping for the plurality of UEs in the cell,
• control the RF unit to transmit a cell-specific sequence hopping parameter to the plurality of UEs in the cell, wherein the cell-specific sequence hopping parameter is used to enable a sequence hopping for the plurality of UEs in the cell,
• control the RF unit to transmit a UE-specific sequence group hopping (SGH) parameter to a certain UE, among the plurality of UEs, wherein the UE-specific SGH parameter is used to disable the sequence hopping, enabled by the cell-specific sequence hopping parameter, for the certain UE, and
• control the RF unit to receive a reference signal, which is generated based on a base sequence number within a base sequence group, wherein the base sequence number within the base sequence group is determined by the UE-specific SGH parameter.