Systems and methods for reference signal measurements in wireless systems

1. A wireless transmit/receive unit (WTRU), comprising:

a processor configured to:

receive resource configuration information that comprises a first resource element mapping for a first subset of reference signals, a first periodicity for the first subset of reference signals, a second resource element mapping for a second subset of reference signals, and a second periodicity for the second subset of reference signals;

receive first measurement configuration information, the first measurement configuration information indicating that the WTRU is to perform a first type of measurement out of a plurality of types of measurements for feedback reporting using the first subset of the reference signals indicated by the resource configuration information and that the first type of measurement is a channel state information (CSI) measurement, wherein the first measurement configuration information indicates one or more first measurement feedback resources, the one or more first measurement feedback resources comprising one or more of time, frequency, code, or beam resources;

receive second measurement configuration information, the second measurement configuration information indicating that the WTRU is to perform a second type of measurement out of a plurality of types of measurements for feedback reporting using the second subset of the reference signals indicated by the resource configuration information and that the second type of measurement is a received power measurement, wherein the second measurement configuration information indicates one or more second measurement feedback resources, the one or more second measurement feedback resource comprising one or more of time, frequency, code, or beam resources, wherein the one or more second measurement resources are different from the one or more first measurement feedback resources;

perform the CSI measurement based on the resource configuration information and the first measurement configuration information to determine a CSI measurement value;

perform the received power measurement based on the resource configuration information and the second measurement configuration information to determine a received power measurement value; and

transmit the CSI measurement value using the one or more first measurement feedback resources indicated by the first measurement configuration information, and transmit the received power measurement value using the one or more second measurement feedback resources indicated by the second measurement configuration information.

2. The WTRU of claim 1 , wherein the reference signals of the first subset and the second subset of reference signals are non-zero power (NZP) channel state information reference signals (CSI-RS).

3. The WTRU of claim 1 , wherein the processor is further configured to receive third measurement configuration information, the third measurement configuration information indicating that the WTRU is to perform a third type of measurement using a third subset of the reference signals and that the third type of measurement is a radio link monitoring measurement.

4. The WTRU of claim 1 , wherein the CSI measurement value comprises one or more of a channel quality indicator (CQI), a precoding matrix indicator (PMI), or a rank indicator (RI).

5. The WTRU of claim 4 , wherein the processor being configured to transmit the CSI measurement value comprises the processor being configured to transmit a feedback report that indicates the one or more of the CQI, PMI, or RI.

6. The WTRU of claim 1 , wherein the processor being configured to transmit the received power measurement value comprises the processor being configured to transmit a feedback report that indicates the received power measurement value.

7. The WTRU of claim 1 , wherein the processor is further configured to determine whether one or more of the reference signals of the first subset and the second subset of reference signals are activated or deactivated.

8. The WTRU of claim 7 , wherein the determination of whether the one or more of the reference signals are activated or deactivated is based on at least one of downlink control information (DCI) or a media access control (MAC) control element (CE).

9. The WTRU of claim 1 , wherein the resource configuration information allows for different types of measurements to be performed on each subset of reference signals.

10. A base station, comprising:

a processor configured to:

transmit resource configuration information that comprises a first resource element mapping for a first subset of reference signals, a first periodicity for the first subset of reference signals, a second resource element mapping for a second subset of reference signals, and a second periodicity for the second subset of reference signals;

transmit first measurement configuration information, the first measurement configuration information indicating that the WTRU is to perform a first type of measurement out of a plurality of types of measurements for feedback reporting using the first subset of the reference signals indicated by the resource configuration information and that the first type of measurement is a channel state information (CSI) measurement, wherein the first measurement configuration information indicates one or more first measurement feedback resources, the one or more first measurement feedback resources comprising one or more of time, frequency, code, or beam resources;

transmit second measurement configuration information, the second measurement configuration information indicating that the WTRU is to perform a second type of measurement out of a plurality of types of measurements for feedback reporting using the second subset of the reference signals indicated by the resource configuration information and that the second type of measurement is a received power measurement, wherein the second measurement configuration information indicates one or more second measurement feedback resources, the one or more second measurement feedback resources comprising one or more time, frequency, code, or beam resources, wherein the one or more second measurement resource are different from the one or more first measurement feedback resources; and

receive the CSI measurement value using the one or more first measurement feedback resource indicated by the first measurement configuration information, and receive the received power measurement value using the one or more second measurement feedback resource indicated by the second measurement configuration information.

11. A wireless transmit/receive unit (WTRU), comprising:

a processor configured to:

receive resource configuration information that comprises a first resource element mapping for a first subset of reference signals, a first periodicity for the first subset of reference signals, a second resource element mapping for a second subset of reference signals, and a second periodicity for the second subset of reference signals;

receive first measurement configuration information, the first measurement configuration information indicating that the WTRU is to perform a first type of measurement out of a plurality of types of measurements for feedback reporting using the first subset of the reference signals indicated by the resource configuration information and that the first type of measurement is a channel state information (CSI) measurement, wherein the first measurement configuration information indicates one or more first measurement feedback resources, the one or more first measurement feedback resources comprising one or more of time, frequency, code, or beam resources;

determine, based on the first measurement configuration information, whether the first type of measurement is to be reported at a wideband level or a subband level, and determine, based on the second measurement configuration information, whether the second type of measurement is to be reported at a wideband level or a subband level;

receive second measurement configuration information, the second measurement configuration information indicating that the WTRU is to perform a second type of measurement out of a plurality of types of measurements for feedback reporting using the second subset of the reference signals indicated by the resource configuration information and that the second type of measurement is a received power measurement, wherein the second measurement configuration information indicates one or more second measurement feedback resources, the one or more second measurement feedback resource comprising one or more of time, frequency, code, or beam resources, wherein the one or more second measurement resources are different from the one or more first measurement feedback resources;

perform the CSI measurement based on the resource configuration information and the first measurement configuration information to determine a CSI measurement value;

perform the received power measurement based on the resource configuration information and the second measurement configuration information to determine a received power measurement value; and

transmit the CSI measurement value using the one or more first measurement feedback resources indicated by the first measurement configuration information, and transmit the received power measurement value using the one or more second measurement feedback resources indicated by the second measurement configuration information.

12. The WTRU of claim 11 , wherein the reference signals of the first subset and the second subset of reference signals are non-zero power (NZP) channel state information reference signals (CSI-RS).

13. The WTRU of claim 11 , wherein the processor is further configured to receive third measurement configuration information, the third measurement configuration information indicating that the WTRU is to perform a third type of measurement using a third subset of the reference signals and that the third type of measurement is a radio link monitoring measurement.

14. The WTRU of claim 11 , wherein the CSI measurement value comprises one or more of a channel quality indicator (CQI), a precoding matrix indicator (PMI), or a rank indicator (RI).

15. The WTRU of claim 14 , wherein the processor being configured to transmit the CSI measurement value comprises the processor being configured to transmit a feedback report that indicates the one or more of the CQI, PMI, or RI.

16. The WTRU of claim 11 , wherein the processor being configured to transmit the received power measurement value comprises the processor being configured to transmit a feedback report that indicates the received power measurement value.

17. The WTRU of claim 11 , wherein the processor is further configured to determine whether one or more of the reference signals of the first subset and the second subset of reference signals are activated or deactivated.

18. The WTRU of claim 17 , wherein the determination of whether the one or more of the reference signals are activated or deactivated is based on at least one of downlink control information (DCI) or a media access control (MAC) control element (CE).

19. The WTRU of claim 17 , wherein the resource configuration information allows for different types of measurements to be performed on each subset of reference signals.

20. A base station, comprising:

a processor configured to:

transmit resource configuration information that comprises a first resource element mapping for a first subset of reference signals, a first periodicity for the first subset of reference signals, a second resource element mapping for a second subset of reference signals, and a second periodicity for the second subset of reference signals;

transmit first measurement configuration information, the first measurement configuration information indicating that the WTRU is to perform a first type of measurement out of a plurality of types of measurements for feedback reporting using the first subset of the reference signals indicated by the resource configuration information and that the first type of measurement is a channel state information (CSI) measurement wherein the first measurement configuration information indicates one or more first measurement feedback resources, the one or more first measurement feedback resources comprising one or more of time, frequency, code, or beam resources;

transmit second measurement configuration information, the second measurement configuration information indicating that the WTRU is to perform a second type of measurement out of a plurality of types of measurements for feedback reporting using the second subset of the reference signals indicated by the resource configuration information and that the second type of measurement is a received power measurement wherein the second measurement configuration information indicates one or more second measurement feedback resources, the one or more second measurement feedback resources comprising one or more of time, frequency, code, or beam resources, wherein the one or more second measurement resources are different from the one or more first measurement feedback resources and wherein:

the first type of measurement associated with the first measurement configuration information is to be reported at a wideband level or a subband level; and

the second type of measurement associated with the second measurement configuration information is to be reported at a wideband level or a subband level; and

receive the CSI measurement value using the one or more first measurement feedback resources indicated by the first measurement configuration information, and receive the received power measurement value using the one or more second measurement feedback resources indicated by the second measurement configuration information.