Abstract
A method and apparatus for determining Physical Random Access Channel (PRACH) resources and using beams are disclosed herein. In an example, a wireless transmit/receive unit (WTRU) may measure a plurality of beam reference signals transmitted from a base station. Further, the WTRU may select a beam reference signal from among the plurality of measured beam reference signals. Also, the WTRU may receive a configuration message from the base station that includes correspondence information regarding the plurality of beam reference signals, wherein the correspondence information designates at least one set of PRACH resources for each of the plurality of beam reference signals. In addition, the WTRU may determine a set of PRACH resources designated for the selected beam reference signal based on the received correspondence information. Moreover, the WTRU may transmit a PRACH signal using at least one PRACH resource of the determined set of PRACH resources.
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WO2014116928A1 | 4G | 25/09/2014 | ISLD-201409-028 | INTERDIGITAL INC |
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WO2014116928A1 | 5G | 21/12/2017 | ISLD-201711-004 | INTERDIGITAL INC |
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WO2014116928A1 | 5G | 20/06/2019 | ISLD-201906-026 | INTERDIGITAL INC |
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CN104956606A | 4G | 25/09/2014 | ISLD-201409-028 | INTERDIGITAL INC |
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Technologies
Product
Use Cases
Services
Claim
1. A method for use in a wireless transmit/receive unit (WTRU) for determining resources, the method comprising:
measuring, by the WTRU, a plurality of beam reference signals transmitted from a base station; selecting, by the WTRU, a beam reference signal from among the plurality of measured beam references signals; receiving, by the WTRU, a configuration message, wherein the configuration message is at least one of a broadcast message or a radio resource control (RRC) message, from the base station that includes correspondence information regarding the plurality of beam reference signals, wherein the correspondence information designates at least one set of Physical Random Access Channel (PRACH) resources for each of the plurality of beam reference signals; determining, by the WTRU, a set of PRACH resources designated for the selected beam reference signal based on the received correspondence information; and transmitting, by the WTRU, a PRACH signal using at least one PRACH resource of the determined set of PRACH resources.
2. The method of claim 1, wherein the correspondence information regarding the plurality of beam reference signals includes a plurality of measurement configurations.
3. The method of claim 1, wherein the determined set of PRACH resources includes at least one PRACH preamble and wherein the PRACH signal is a PRACH preamble in the determined set of PRACH resources.
4. The method of claim 1, wherein the WTRU selects a beam reference signal based on a determination that a measured beam reference signal power is better than a threshold on at least one beam reference signal.
5. The method of claim 1, wherein the at least one set of PRACH resources is portioned based on the number of the plurality of beam reference signals.
6. The method of claim 1, wherein the beam reference signals are Channel State Information-Reference Signals (CSI-RSs).
7. The method of claim 1, wherein the determined set of PRACH resources includes at least one set of time resources and wherein the PRACH signal is transmitted in one of the time resources of the set of time resources.
8. The method of claim 1, wherein the beam is a 3-D beam.
9. The method of claim 1, further comprising:
determining, by the WTRU, the PRACH signal based on the received correspondence information.
10. A wireless transmit/receive unit (WTRU) for determining resources, the WTRU comprising:
a processor, operatively coupled to a transceiver, the processor and the transceiver configured to measure a plurality of beam reference signals transmitted from a base station; the processor configured to select a beam reference signal from among the plurality of measured beam references signals; the transceiver configured to receive a configuration message, wherein the configuration message is at least one of a broadcast message or a radio resource control (RRC) message, from the base station that includes correspondence information regarding the plurality of beam reference signals, wherein the correspondence information designates at least one set of Physical Random Access Channel (PRACH) resources for each of the plurality of beam reference signals; the processor configured to determine a set of PRACH resources designated for the selected beam reference signal based on the received correspondence information; and the processor and the transceiver configured to transmit a PRACH signal using at least one PRACH resource of the determined set of PRACH resources.
11. The WTRU of claim 10, wherein the correspondence information regarding the plurality of beam reference signals includes a plurality of measurement configurations.
12. The WTRU of claim 10, wherein the determined set of PRACH resources includes at least one PRACH preamble and wherein the PRACH signal is a PRACH preamble in the determined set of PRACH resources.
13. The WTRU of claim 10, wherein the processor selects a beam reference signal based on a determination that a measured beam reference signal power is better than a threshold on at least one beam reference signal.
14. The WTRU of claim 10, wherein the at least one set of PRACH resources is portioned based on the number of the plurality of beam reference signals.
15. The WTRU of claim 10, wherein the beam reference signals are Channel State Information-Reference Signals (CSI-RSs).
16. The WTRU of claim 10, wherein the determined set of PRACH resources includes at least one set of time resources and wherein the PRACH signal is transmitted in one of the time resources of the set of time resources.
17. The WTRU of claim 10, wherein the beam is a 3-D beam.
18. The WTRU of claim 10, further comprising:
the processor further configured to determine the PRACH signal based on the received correspondence information.
19. A method for use in a wireless transmit/receive unit (WTRU) for determining resources, the method comprising:
measuring, by the WTRU, a plurality of beam reference signals transmitted from a base station; selecting, by the WTRU, a beam reference signal from among the plurality of measured beam references signals; receiving, by the WTRU, a configuration message, wherein the configuration message is at least one of a broadcast message or a radio resource control (RRC) message, from the base station that includes correspondence information regarding the plurality of beam reference signals, wherein the correspondence information provides at least one set of Physical Random Access Channel (PRACH) preambles, wherein the set of PRACH preambles includes one or more PRACH preambles, for each of the plurality of beam reference signals; determining, by the WTRU, a set of PRACH preambles designated for the selected beam reference signal based on the received correspondence information; and transmitting, by the WTRU, a PRACH preamble of the determined set of PRACH preambles.
20. The method of claim 19, wherein the correspondence information regarding the plurality of beam reference signals includes a plurality of measurement configurations.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.