Unified non-orthogonal multiple access
Systems, methods, and instrumentalities are described herein that may be used for NOMA resource selection. Different types of NOMA resources may be configured by a network and selected by a WTRU based on rules, priorities, fairness, overloading factors, multiple access signature sizes, measurement results, payload sizes, and/or the like. Single-NOMA operations may be performed using DFT-invariant codewords. Multiple NOMA schemes may coexist with different codeword types and/or codeword sizes.
1. A wireless transmit/receive unit (WTRU), comprising:
a processor configured to:
receive configuration information from a base station, wherein the configuration information indicates a first set of resources and a second set of resources, wherein the first set of resources is associated with at least one of a first overloading factor value or a first multiple access signature size, and wherein the second set of resources is associated with at least one of a second overloading factor value or a second multiple access signature size;
perform a measurement;
select, based at least on a result of the measurement, one or more resources for performing an uplink non-orthogonal multiple access transmission, wherein the one or more resources are selected from the first set of resources or the second set of resources, wherein, if the one or more resources are selected from the first set of resources, the selection is further based on the at least one of the first overloading factor value or the first multiple access signature size, and wherein, if the one or more resources are selected from the second set of resources, the selection is further based on the at least one of the second overloading factor value or the second multiple access signature size; and
perform the uplink non-orthogonal multiple access transmission using the selected one or more resources.
2. The WTRU of claim 1 , wherein the first multiple access signature size comprises a first codeword size and wherein the second multiple access signature size comprises a second codeword size.
3. The WTRU of claim 1 , wherein the configuration information indicates that the first set of resources is associated with a first combination of one or more overloading factor values and one or more multiple access signature sizes, and that the second set of resources is associated with a second combination of one or more overloading factor values and one or more multiple access signature sizes.
4. The WTRU of claim 3 , wherein the configuration information indicates that the first set of resources is to be used with an overloading factor having a value above a first overloading threshold and with a multiple access signature having a length below a first signature length threshold, the configuration information further indicating that the second set of resources is to be used with an overloading factor having a value below a second overloading threshold and with a multiple access signature having a length above a second signature length threshold.
5. The WTRU of claim 3 , wherein the processor being configured to select the one or more resources for performing the uplink non-orthogonal multiple access transmission comprises the processor being configured to:
compare the result of the measurement with a measurement threshold;
determine an overloading factor and a multiple access signature associated with the uplink non-orthogonal multiple access transmission; and
select the one or more resources based on the comparison and the determined overloading factor and multiple access signature.
6. The WTRU of claim 5 , wherein the uplink non-orthogonal multiple access transmission is transmitted using the selected one or more resources and the determined multiple access signature.
7. The WTRU of claim 6 , wherein the multiple access signature is determined based on an indication received from the base station.
8. The WTRU of claim 5 , wherein the processor is further configured to receive the measurement threshold from the base station.
9. The WTRU of claim 1 , wherein the measurement includes a signal-to-noise ratio (SNR) measurement or a reference signal received power (RSRP) measurement.
10. The WTRU of claim 1 , wherein the one or more resources are selected from the first set of resources or the second set of resources further based on a random factor.
11. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
receiving configuration information from a base station, wherein the configuration information indicates a first set of resources and a second set of resources, wherein the first set of resources is associated with at least one of a first overloading factor value or a first multiple access signature size, and wherein the second set of resources is associated with at least one of a second overloading factor value or a second multiple access signature size;
performing a measurement;
selecting, based on at least a result of the measurement, one or more resources for performing an uplink non-orthogonal multiple access transmission, wherein the one or more resources are selected from the first set of resources or the second set of resources, wherein, if the one or more resources are selected from the first set of resources, the selection is further based on the at least one of the first overloading factor value or the first multiple access signature size, and wherein, if the one or more resources are selected from the second set of resources, the selection is further based on the at least one of the second overloading factor value or the second multiple access signature size; and
performing the uplink non-orthogonal multiple access transmission using the selected one or more resources.
12. The method of claim 11 , wherein the first multiple access signature size comprises a first codeword size and the second multiple access signature size comprises a codeword size.
13. The method of claim 11 , wherein the configuration information indicates that the first set of resources is associated with a first combination of one or more overloading factor values and one or more multiple access signature sizes, and that the second set of resources is associated with a second combination of one or more overloading factor values and one or more multiple access signature sizes.
14. The method of claim 13 , wherein the configuration information indicates that the first set of resources is to be used with an overloading factor having a value above a first overloading threshold and with a multiple access signature having a length below a first signature length threshold, the configuration information further indicating that the second set of resources is to be used with an overloading factor having a value below a second overloading threshold and with a multiple access signature having a length above a second signature length threshold.
15. The method of claim 13 , wherein selecting the one or more resources for performing the uplink non-orthogonal multiple access transmission comprises:
comparing the result of the measurement with a measurement threshold;
determining an overloading factor and a multiple access signature associated with the uplink non-orthogonal multiple access transmission; and
selecting the one or more resources based on the comparison and the determined overloading factor and multiple access signature.
16. The method of claim 15 , wherein the uplink non-orthogonal multiple access transmission is transmitted using the selected one or more resources and the determined multiple access signature.
17. The method of claim 16 , wherein the multiple access signature is determined based on an indication received from the base station.
18. The method of claim 15 , further comprising receiving the measurement threshold from the base station.
19. The method of claim 11 , wherein the measurement includes a signal-to-noise ratio (SNR) measurement or a reference signal received power (RSRP) measurement.
20. The method of claim 11 , wherein the one or more resources are selected from the first set of resources or the second set of resources further based on a random factor.