Transmission schemes and modes and fallback schemes for the access link of systems operating in higher frequency bands
A wireless transmit/receive unit (WTRU) is configured to receive an identifier of a beam. The WTRU is configured to measure a downlink quality associated with at least one beam. The WTRU is configured to determine whether the measured downlink quality is below a threshold value. The WTRU is configured to receive at least one control channel transmission using the beam of the identifier in response to a determination that the measured downlink quality is below the threshold value, wherein the beam used to receive the at least one control channel transmission is a same beam used to receive an associated data channel transmission.
1. A wireless transmit/receive unit (WTRU) comprising:
a transceiver; and
a processor, wherein:
the transceiver and the processor are configured to receive a first identifier of a beam;
the processor is further configured to measure a downlink quality associated with at least one beam;
the processor is further configured to determine whether the measured downlink quality is below a threshold value; and
the transceiver and the processor are further configured to receive at least one control channel transmission using the beam of the first identifier, based on, in part, a determination that the measured downlink quality is below the threshold value, wherein the beam of the first identifier used to receive the at least one control channel transmission is a same beam that is used to receive an associated data channel transmission.
2. The WTRU of claim 1 , wherein the measured downlink quality is of a beam different than the beam of the first identifier.
3. The WTRU of claim 1 , wherein the transceiver and the processor are further configured to receive at least one control channel transmission of a second beam, based on, in part, a determination that the measured downlink quality is not below the threshold value, wherein the second beam is different than the beam of the first identifier.
4. The WTRU of claim 1 , wherein the beam of the first identifier is a fallback beam.
5. The WTRU of claim 1 , wherein the measured downlink quality is reference signal received power (RSRP).
6. The WTRU of claim 1 , wherein the beam of the first identifier is associated with a transmission scheme.
7. The WTRU of claim 1 , wherein the transceiver and the processor are further configured to:
receive, in the at least one control channel transmission, a second identifier of a beam; and
receive a data transmission using the beam of the second identifier.
8. The WTRU of claim 1 wherein the processor is further configured to:
measure a plurality of beams; and
report an indication of a beam associated with a highest measured value to a base station.
9. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving a first identifier of a beam;
measuring a downlink quality associated with at least one beam;
determining whether the measured downlink quality is below a threshold value; and
receiving at least one control channel transmission using the beam of the first identifier, based on, in apart, a determination that the measured downlink quality is below the threshold value, wherein the beam of the first identifier used for receiving the at least one control channel transmission is a same beam that is used for receiving an associated data channel transmission.
10. The method of claim 9 , wherein the measured downlink quality is of a beam different than the beam of the first identifier.
11. The method of claim 9 further comprising receiving at least one control channel transmission of a second beam, based on, in part, a determination that the measured downlink quality is not below the threshold value, wherein the second beam is different than the beam of the first identifier.
12. The method of claim 9 , wherein the beam of the first identifier is a fallback beam.
13. The method of claim 9 , wherein the measured downlink quality is reference signal received power (RSRP).
14. The method of claim 9 , wherein the beam of the first identifier is associated with a transmission scheme.
15. The method of claim 9 further comprising:
receiving, in the at least one control channel transmission, a second identifier of a beam; and
receiving a data transmission using the beam of the second identifier.
16. The method of claim 9 further comprising:
measuring a plurality of beams; and
reporting an indication of a beam associated with a highest measured value to a base station.