Resource pattern for uplink transmissions
Some wireless communication systems may attempt to balance frequent transmission opportunities (e.g., where the frequency of the opportunities may refer to gaps in the time domain, frequency domain, etc.) with a desire for communication reliability and/or interference diversity. In accordance with the described techniques, some such systems may apportion communicating devices into groups, where resources are strategically assigned to each group so as to reduce latency without significantly compromising communication reliability or interference diversity (e.g., by allowing a membership of the groups to cycle through all possible combinations before repeating). Such techniques may support delay-sensitive communications, channel sounding procedures, or other similar types of transmissions. Resources may be allocated based on a scheduling parameter transmitted to a user equipment (UE), which may implicitly or explicitly indicate a plurality of resource offsets to the UE.
1. A method for wireless communication at a user equipment (UE), comprising:
receiving, from a base station, a scheduling parameter associated with a transmission opportunity period;
determining, based at least in part on the scheduling parameter, a plurality of resource offsets for the UE, wherein each resource offset of the plurality of resource offsets comprises a timing offset; and
performing an uplink transmission using a set of transmission resources associated with the plurality of resource offsets.
2. The method of claim 1 , further comprising:
determining a periodicity of the transmission opportunity period based at least in part on the scheduling parameter; and
determining the set of transmission resources based at least in part on the periodicity of the transmission opportunity period and the plurality of resource offsets for the UE with respect to the transmission opportunity period.
3. The method of claim 1 , further comprising:
determining a cyclic shift offset associated with the UE;
determining a number of UEs associated with the transmission opportunity period based at least in part on the scheduling parameter; and
wherein determining the plurality of resource offsets for the UE is based at least in part on the number of UEs associated with the transmission opportunity period and the determined cyclic shift offset.
4. The method of claim 1 , further comprising:
determining a base sequence and a cyclic shift offset associated with the UE;
wherein determining the plurality of resource offsets for the UE is based at least in part on the base sequence and the determined cyclic shift offset.
5. The method of claim 1 , further comprising:
identifying an interference metric for at least one other UE associated with the transmission opportunity period, wherein the plurality of resource offsets is determined based at least in part on the interference metric.
6. The method of claim 1 , wherein the scheduling parameter comprises a first explicit indication of a number of UEs associated with the transmission opportunity period, a number of cyclic shifts, a periodicity of the transmission opportunity period, or a combination thereof; a second explicit indication of a number of the plurality of resource offsets; or both.
7. The method of claim 1 , wherein the scheduling parameter comprises an index of a look-up table, the index indicating a number of UEs associated with the transmission opportunity period, a number of the plurality of resource offsets, or both.
8. The method of claim 1 , wherein the uplink transmission comprises a sounding reference signal (SRS) transmission, a scheduling request transmission, or a data transmission.
9. The method of claim 8 , wherein the data transmission comprises a grant-free uplink transmission.
10. The method of claim 1 , wherein determining the plurality of resource offsets for the UE comprises:
determining a plurality of resource block indices of the transmission opportunity period.
11. The method of claim 1 , wherein each resource offset of the plurality of resource offsets further comprises a frequency offset.
12. A method for wireless communication at a base station, comprising:
identifying a plurality of user equipment (UEs) associated with a transmission opportunity period;
apportioning the set of UEs into a set of groups, each group associated with a respective resource offset, wherein each respective resource offset comprises a timing offset, and wherein at least two groups of the set of groups comprise a same UE of the set of UEs;
determining a scheduling parameter for each UE of the set of UEs based at least in part on a number of UEs in the set of UEs; and
transmitting the scheduling parameter to each UE of the set of UEs.
13. The method of claim 12 , further comprising:
determining a periodicity of the transmission opportunity period based at least in part on the number of UEs in the set of UEs.
14. The method of claim 13 , further comprising:
determining the resource offset for each group based at least in part on the number of UEs in the set of UEs;
identifying a set of transmission resources for each group based at least in part on the periodicity of the transmission opportunity period and the resource offset for the group; and
receiving an uplink transmission over at least one set of transmission resources.
15. The method of claim 14 , wherein the uplink transmission comprises a sounding reference signal (SRS) transmission, a scheduling request (SR) transmission, or a data transmission.
16. The method of claim 15 , wherein the data transmission comprises a grant-free uplink transmission.
17. The method of claim 12 , further comprising:
determining a base sequence of resource offsets;
determining a cyclic shift offset for each UE of the set of UEs, wherein the scheduling parameter is based at least in part on the determined base sequence of resources offsets and the determined cyclic shift offset.
18. The method of claim 12 , further comprising:
determining a latency metric for the transmission opportunity period, wherein the set of UEs are apportioned into the set of groups based at least in part on the latency metric.
19. The method of claim 12 , further comprising:
determining a number of UEs in each group of the set of groups, wherein the scheduling parameter is based at least in part on the number of UEs in the set of UEs and the number of UEs in each group.
20. The method of claim 12 , further comprising:
determining an interference metric between two UEs of the set of UEs, wherein the set of UEs are apportioned into the set of groups based at least in part on the interference metric.
21. The method of claim 12 , wherein a scheduling parameter for a UE of the set of UEs comprises a first explicit indication of the number of UEs associated with the transmission opportunity period, a number of cyclic shifts, a periodicity of the transmission opportunity period, a combination thereof; a second explicit indication of a number of resource offsets for the UE; or both.
22. The method of claim 12 , wherein a scheduling parameter for a UE of the set of UEs comprises an index of a look-up table, the index indicating the number of UEs associated with the transmission opportunity period, a number of resource offsets for the UE, or both.
23. The method of claim 12 , wherein each resource offset comprises an index to a resource block of the transmission opportunity period.
24. The method of claim 12 , wherein each group of the set of groups comprises a unique set of UEs of the set of UEs.
25. The method of claim 12 , wherein each group of the set of groups comprises a respective pair of UEs of the set of UEs.
26. The method of claim 25 , wherein the set of groups comprises each possible pair of UEs of the set of UEs.
27. The method of claim 12 , wherein each respective resource offset further comprises a frequency offset.
28. An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive, from a base station, a scheduling parameter associated with a transmission opportunity period;
determine, based at least in part on the scheduling parameter, a plurality of resource offsets for the apparatus, wherein each resource offset of the plurality of resource offsets comprises a timing offset; and
perform an uplink transmission using a set of transmission resources associated with the plurality of resource offsets.
29. The apparatus of claim 28 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine a cyclic shift offset associated with the apparatus;
determine a number of user equipment (UEs) associated with the transmission opportunity period based at least in part on the scheduling parameter; and
determine the plurality of resource offsets for the apparatus based at least in part on the number of user equipment (UEs) associated with the transmission opportunity period and the determined cyclic shift offset.
30. An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify a plurality of user equipment (UEs) associated with a transmission opportunity period;
apportion the set of UEs into a set of groups, each group associated with a respective resource offset, wherein each respective resource offset comprises a timing offset, and wherein at least two groups of the set of groups comprise a same UE of the set of UEs;
determine a scheduling parameter for each UE of the set of UEs based at least in part on a number of UEs in the set of UEs; and
transmit the scheduling parameter to each UE of the set of UEs.