Scheduling and transmission for NOMA
Access, collision handling, and resolution for non-orthogonal multiple-access (NOMA) may be used. Fixed or dynamic group demodulation reference signal (DMRS) and multiple-access (MA) signature for NOMA retransmission may be used. A wireless transmit/receive unit (WTRU) may receive MAS information or DMRS information from a network entity. A WTRU may receive indication of the MAS information or DMRS information via a subgrouping-based scheme, a bitmap indication, or a binary threshold. A WTRU may receive an indication of a resource group size from the network entity. Based on the resource group size, the WTRU may determine whether the MAS information or the DMRS information is indicated via the subgrouping-based scheme or via the binary threshold scheme. The WTRU, based on how the MAS information or the DMRS information is indicated, may determine a resource to be used for a NOMA transmission. The WTRU may send the NOMA transmission using the determined resource.
1. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to at least:
receive information indicating a plurality of sequence indices associated with a plurality of sequences to be used by the WTRU for a transmission;
receive a threshold index, wherein the threshold index indicates that a first subset of the plurality of sequence indices that are lesser or equal to the threshold index belong to a first group of sequence indices and a second subset of the plurality of sequence indices that are greater than the threshold index belong to a second group of sequence indices;
select, from the first group of sequence indices or the second group of sequence indices, a sequence index indicating a sequence to be sent in the transmission; and
send the transmission, wherein the transmission comprises the sequence indicated by the selected sequence index.
2. The WTRU of claim 1 , wherein the processor is further configured to:
receive a group indication; and
based on the group indication, select the first group of sequence indices or the second group of sequence indices.
3. The WTRU of claim 1 , wherein the threshold index is received via a physical downlink control channel (PDCCH) transmission.
4. The WTRU of claim 2 , wherein the group indication is a dynamic indication received via a grant or via signaling.
5. The WTRU of claim 1 , wherein the sequence is a signature or a reference signal.
6. The WTRU of claim 5 , wherein the signature is a multiple access (MA) signature and the reference signal is a demodulation reference signal (DMRS).
7. The WTRU of claim 1 , wherein the plurality of sequence indices is received from a base station.
8. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving information indicating a plurality of sequence indices associated with a plurality of sequences to be used by the WTRU for a transmission;
receiving a threshold index, wherein the threshold index indicates that a first subset of the plurality of sequence indices that are lesser or equal to the threshold index belong to a first group of sequence indices and a second subset of the plurality of sequence indices that are greater than the threshold index belong to a second group of sequence indices;
selecting, from the first group of sequence indices or the second group of sequence indices, a sequence index indicating a sequence to be sent in the transmission; and
sending the transmission, wherein the transmission comprises the sequence indicated by the selected sequence index.
9. The method of claim 8 further comprising:
receiving a group indication; and
based on the group indication, selecting the first group of sequence indices or the second group of sequence indices.
10. The method of claim 8 , wherein the threshold index is received via a physical downlink control channel (PDCCH) transmission.
11. The method of claim 9 , wherein the group indication is a dynamic indication received via a grant or via signaling.
12. The method of claim 8 , wherein the sequence is a signature or a reference signal.
13. The method of claim 12 , wherein the signature is a multiple access (MA) signature and the reference signal is a demodulation reference signal (DMRS).
14. The method of claim 8 , wherein the plurality of sequence indices is received from a base station.