Terminal device, base station device, and communication method

A radio communication terminal comprising:

• a receiver, which, in operation, receives an instruction specifically signaled to the radio communication terminal by a Radio Resource Control (RRC) layer, the instruction including a parameter of a sequence number;
• a controller, which is coupled to the receiver and which, in operation, configures a sequence number based on the received instruction, ignoring a sequence number allocated to a cell that contains the radio communication terminal, and generates a Sounding Reference Signal (SRS) of a sequence group corresponding to the configured sequence number;
• and
• a transmitter, which is coupled to the controller and which, in operation, transmits the generated SRS,
• wherein the sequence group corresponding to the configured sequence number is based on a cell-specific sequence group number, to which a variable offset is added, wherein the variable offset temporally varies to take different values in different time slots in one cycle period.

A method performed by a radio communication terminal, the method comprising:

• in response to receiving signaling specific to the radio communication terminal, determining a base sequence group based on the received signaling;
• in response to not receiving signaling specific to the radio communication terminal, determining a base sequence group which is allocated to a cell that contains the radio communication terminal;
• generating a sounding reference signal (SRS) using the determined base sequence group;
• and
• transmitting the generated SRS,
• wherein the base sequence group determined based on the signaling specific to the radio communication terminal is based on a cell-specific sequence group number, to which a variable offset is added, wherein the variable offset temporally varies to take different values in different time slots in one cycle period.

A method performed by a radio communication terminal, the method comprising:

• receiving an instruction specifically signaled to the radio communication terminal by a Radio Resource Control (RRC) layer, the instruction including a parameter of a sequence number;
• configuring a sequence number based on the received instruction, ignoring a sequence number allocated to a cell that contains the radio communication terminal;
• generating a Sounding Reference Signal (SRS) of a sequence group corresponding to the configured sequence number;
• and
• transmitting the generated SRS,
• wherein the sequence group corresponding to the configured sequence number is based on a cell-specific sequence group number, to which a variable offset is added, wherein the variable offset temporally varies to take different values in different time slots in one cycle period.