Uplink user resource allocation for orthogonal time frequency space modulation
A method of reducing peak to average power ratio of uplink transmission includes, assigning a slice of transmission resource to uplink transmission from a user equipment, where all resource elements in the slice have a same Doppler value, mapping data to the slice, performing orthogonal time frequency space transformation to generate time-frequency domain data and processing the time-frequency domain data for transmission.
1. A method of allocating transmission resources to uplink transmission from a user equipment, comprising:
dividing transmission resources into a two-dimensional grid of resource elements defined by a delay dimension and a Doppler dimension that is orthogonal to the delay dimension;
assigning, to an uplink transmission from a user equipment, a set of resource elements, wherein the set of resource elements comprises a Doppler slice of a delay-Doppler plane that includes all resource elements having a single Doppler value along the Doppler dimension;
mapping data symbols of the uplink transmission to the set of resource elements;
performing an orthogonal time frequency space (OTFS) transform on the mapped set of resource elements into a time-frequency representation; and
processing and transmitting the time-frequency domain signal.
2. The method of claim 1 , wherein the OTFS transform of the mapped set of resource elements results in the time-frequency representation being spread across an entire frequency band.
3. The method of claim 1 , wherein the assigning the set of resources includes:
assigning, to the user equipment, a set of resources comprising all resources along the delay dimension for one or more Doppler dimension values in a logical group of resources.
4. The method of claim 3 , wherein the logical group of resources includes one or more physical resource blocks (PRBs), and wherein a PRB includes a number of symbols along one Doppler value.
5. The method of claim 3 , wherein the logical group of resources includes a number of transmission symbols.
6. The method of claim 3 , wherein the set of resources in a delay-Doppler domain assigned to uplink data transmission of each user equipment are non-overlapping, and wherein the time-frequency domain signal for at least some of the user equipment are overlapping in time/and or frequency dimension.
7. The method of claim 3 , wherein a base station controls uplink transmission resources used by each user equipment.
8. A method of reducing peak to average power ratio of an uplink transmission from a user equipment, comprising:
dividing transmission resources into a two-dimensional grid of resource elements defined by a delay dimension and a Doppler dimension that is orthogonal to the delay dimension;
assigning, to an uplink transmission from a user equipment, a set of resource elements, wherein the set of resource elements comprises a Doppler slice of a delay-Doppler plane that includes all resource elements having a single Doppler value along the Doppler dimension;
mapping data symbols of the uplink transmission to the set of resource elements;
performing an orthogonal time frequency space (OTFS) transform on the mapped set of resource elements into a time-frequency representation; and
processing and transmitting the time-frequency domain signal.
9. The method of claim 8 , wherein the processing the time-frequency domain signal includes zero-padding and generating a time series of symbols for transmission.
10. The method of claim 8 , wherein the set of resource elements are logically divided into a number of physical resource blocks (PRBs), wherein each PRB includes a number of symbols along the single Doppler value.
11. A wireless transmission apparatus comprising a processor configured to implement a method, the method comprising:
dividing transmission resources into a two-dimensional grid of resource elements defined by a delay dimension and a Doppler dimension that is orthogonal to the delay dimension;
assigning, to an uplink transmission from a user equipment, a set of resource elements wherein the set of resource elements comprises a Doppler slice of a delay-Doppler plane that includes all resource elements having a single Doppler value along the Doppler dimension;
mapping data symbols of the uplink transmission to the set of resource elements;
performing an orthogonal time frequency space (OTFS) transform on the mapped set of resource elements into a time-frequency representation; and
generating the time-frequency domain signal.
12. The wireless transmission apparatus of claim 11 , wherein the OTFS transform of the mapped set of resource elements results in the time-frequency representation being spread across an entire frequency band.
13. The wireless transmission apparatus of claim 11 , wherein the assigning the set of resources includes assigning, to the user equipment, a set of resources comprising all resources along the delay dimension for one or more Doppler dimension values in a logical group of resources.
14. The wireless transmission apparatus of claim 13 , wherein the logical group of resources includes one or more physical resource blocks (PRBs), and wherein a PRB includes a number of symbols along one Doppler value.
15. The wireless transmission apparatus of claim 13 , wherein the logical group of resources includes a number of transmission symbols.
16. The wireless transmission apparatus of claim 13 , wherein the set of resources in a delay-Doppler domain assigned to uplink data transmission of each user equipment are non-overlapping, and wherein the time-frequency domain signal for at least some of the user equipment are overlapping in a time dimension or a frequency dimension.
17. The wireless transmission apparatus of claim 13 , wherein a base station controls uplink transmission resources used by each user equipment.