Apparatus and method for uplink transmission in wireless communication systems

1. A method of a User Equipment (UE) in a wireless network including at least one Base Station (BS), the method comprising:

receiving an Information Element (IE) for configuring at least one of a Physical Uplink Shared Channel (PUSCH) power control method and a PUSCH Demodulation Reference Signal (DMRS) generation method from the at least one BS;

determining a state of the IE; and

transmitting a PUSCH and a DMRS for the PUSCH according to the state of the IE,

wherein a transmission power of the PUSCH is controlled according to the state of the IE,

wherein, when the state of the IE indicates a first state, then the transmission power of the PUSCH is determined according to a first power control equation,

wherein, when the state of the IE indicates a second state, then the transmission power of the PUSCH is determined according to a second power control equation, and

wherein a base sequence for the PUSCH DMRS is generated according to the state of the IE.

2. The method of claim 1 , wherein, when the state of the IE indicates the first state, then the base sequence is generated according to a physical cell Identifier (ID) assigned for a cell corresponding to the at least one BS, and

wherein, when the state information of the IE indicates the second state, the base sequence is generated according to a virtual cell ID.

3. The method of claim 1 , wherein, when the state of the IE indicates the first state, then the base sequence is generated according to a first virtual cell Identifier (ID), and

wherein, when the state information of the IE indicates the second state, the base sequence is generated according to a second virtual cell ID.

4. The method of claim 1 , wherein, the first power control equation is a function of a path-loss measurement based upon Cell-specific Reference Signals (RSs) (CRSs), and

wherein the second power control equation is a function of a path-loss measurement based upon Channel State Information (CSI)-RSs that are configured according to a CSI-RS configuration.

5. The method of claim 1 , wherein, the first power control equation is a function of a path-loss measurement based upon Channel State Information (CSI)-Reference Signals (RSs) that are configured according to a first CSI-RS configuration, and

wherein the second power control equation is a function of a path-loss measurement based upon CSI-RSs that are configured according to a second CSI-RS configuration.

6. The method of claim 1 , wherein the IE is transmitted in a Radio Resource Control (RRC) layer of the wireless network.

7. The method of claim 1 , wherein the IE is an at least one-bit field included in at least one of a Downlink Control Information (DCI) format 0 message and a DCI format 4 message.

8. A User Equipment (UE) apparatus for communicating in a wireless network including at least one Base Station (BS), the apparatus comprising:

a transceiver for receiving an Information Element (IE) for configuring at least one of a Physical Uplink Shared Channel (PUSCH) power control method and a PUSCH Demodulation Reference Signal (DMRS) generation method from the at least one BS, and for transmitting a PUSCH and a DMRS for the PUSCH according to a state of the IE; and

a controller for determining the state of the IE, for determining a transmission power of the PUSCH according to the state of the IE, and for generating a base sequence for the PUSCH DMRS according to the state of the IE,

wherein, when the state of the IE indicates a first state, then the controller determines the transmission power of the PUSCH according to a first power control equation, and

wherein, when the state of the IE indicates a second state, then the controller determines the transmission power of the PUSCH according to a second power control equation.

9. The apparatus of claim 8 , wherein, when the state of the IE indicates the first state, then the controller generates the base sequence according to a physical cell Identifier (ID) assigned for a cell corresponding to the at least one BS, and

wherein, when the state information of the IE indicates the second state, the controller generates the base sequence according to a virtual cell ID.

10. The apparatus of claim 8 , wherein, when the state of the IE indicates the first state, then the controller generates the base sequence according to a first virtual cell Identifier (ID), and

wherein, when the state information of the IE indicates the second state, then the controller generates the base sequence according to a second virtual cell ID.

11. The apparatus of claim 8 , wherein, the first power control equation is a function of a path-loss measurement based upon Cell-specific Reference Signals (RSs) (CRSs), and

wherein the second power control equation is a function of a path-loss measurement based upon Channel State Information (CSI)-RSs that are configured according to a CSI-RS configuration.

12. The apparatus of claim 8 , wherein, the first power control equation is a function of a path-loss measurement based upon Channel State Information (CSI)-Reference Signals (RSs) that are configured according to a first CSI-RS configuration, and

wherein the second power control equation is a function of a path-loss measurement based upon CSI-RSs that are configured according to a second CSI-RS configuration.

13. The apparatus of claim 8 , wherein the transceiver receives the IE in a Radio Resource Control (RRC) layer of the wireless network.

14. The apparatus of claim 8 , wherein the transceiver receives the IE as an at least a one-bit field included in at least one of a Downlink Control Information (DCI) format 0 message and a DCI format 4 message.

15. A Base Station (BS) apparatus for communicating in a wireless network including at least one User Equipment (UE), the apparatus comprising:

a controller for determining a state of an Information Element (IE) for configuring at least one of a Physical Uplink Shared Channel (PUSCH) power control method and a PUSCH Demodulation Reference Signal (DMRS) generation method of the at least one UE; and

a transceiver for transmitting the IE to the at least one UE, for receiving a PUSCH and a DMRS for the PUSCH according to the state of the IE from the at least one UE, and for receiving a base sequence for the PUSCH DMRS according to the state of the IE,

wherein, when the state of the IE indicates a first state, then the transceiver receives the transmission power of the PUSCH according to a first power control equation, and

wherein, when the state of the IE indicates a second state, then the transceiver receives the transmission power of the PUSCH according to a second power control equation.

16. The apparatus of claim 15 , wherein when the controller determines the IE to have the first state, then the base sequence is generated according to a physical cell Identifier (ID) assigned for a cell corresponding to the BS, and

wherein, the controller determines the IE to have the second state, then the base sequence is generated according to a virtual cell ID.

17. The apparatus of claim 15 , wherein when the controller determines the IE to have the first state, then the base sequence is generated according to a first virtual cell Identifier (ID), and

wherein, when the controller determines the IE to have the second state, then the base sequence is generated according to a second virtual cell ID.

18. The apparatus of claim 15 , wherein, the first power control equation is a function of a path-loss measurement based upon Cell-specific Reference Signals (RSs) (CRSs), and

wherein the second power control equation is a function of a path-loss measurement based upon Channel State Information (CSI)-RSs that are configured according to a CSI-RS configuration.

19. The apparatus of claim 15 , wherein, the first power control equation is a function of a path-loss measurement based upon Channel State Information (CSI)-Reference Signals (RSs) that are configured according to a first CSI-RS configuration, and

wherein the second power control equation is a function of a path-loss measurement based upon CSI-RSs that are configured according to a second CSI-RS configuration.

20. The apparatus of claim 15 , wherein the transceiver transmits the IE in a Radio Resource Control (RRC) layer of the wireless network.

21. The apparatus of claim 15 , wherein the transceiver transmits the IE as an at least a one-bit field included in at least one of a Downlink (DL) Control Information (DCI) format 0 message and a DCI format 4 message.