Transmission resource allocation by splitting physical resource blocks
Methods, systems and devices for providing transmission resources that achieve transmission diversity while reducing pilot signal overhead are described. An exemplary wireless communication method may be implemented in a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension. The method includes logically dividing subcarriers in each PRB into an integer number of sub-groups of subcarriers, wherein the integer number is greater than one, allocating, to a transmission, transmission resources corresponding to one or more of the sub-groups of subcarriers, performing the transmission in the wireless communication system.
1. In a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two-dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension, a wireless communication method implemented by a base station, the method comprising:
logically dividing subcarriers in each PRB into an integer number of sub-groups of sub-carriers, wherein the integer number is greater than one;
allocating, to a transmission comprising signals, transmission resources corresponding to one or more of the sub-groups of subcarriers, wherein the signals are assigned according to delay-Doppler domain units; and
performing the transmission in the wireless communication system.
2. The method of claim 1 wherein subcarriers in each sub-group are contiguous.
3. The method of claim 1 , wherein the signals comprise a data signal, a control signal, a system message signal, or a reference signal.
4. The method of claim 1 , wherein the integer number of sub-groups is determined using a run-time condition of the wireless communication system, wherein run-time condition comprises at least one of a number of legacy user devices operating in the wireless communication system, characteristics of a channel over which the transmission is performed, and length of data transmitted over the transmission.
5. The method of claim 1 , wherein the performing the transmission comprises performing transmission using an orthogonal time frequency space (OTFS) scheme, and wherein each subcarrier in each sub-group is assigned to a different OTFS frame.
6. The method of claim 1 , wherein the receiving the transmission comprises receiving the signals modulated using a dispersed orthogonal time frequency space (D-OTFS) scheme, and wherein each subcarrier in each sub-group is assigned to a different D-OTFS frame.
7. In a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two-dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension, a wireless communication method implemented by a wireless terminal, the method comprising:
receiving, on a wireless channel, a transmission comprising signals, wherein the signals are assigned according to delay-Doppler domain units; and
demodulating the signals occupying sub-groups of subcarriers corresponding to one of a sub-group of subcarriers in which each PRB is logically divided,
wherein each PRB is logically divided into an integer number of sub-groups of sub-carriers, wherein the integer number is greater than one.
8. The method of claim 7 wherein subcarriers in each sub-group are contiguous.
9. The method of claim 7 , wherein the signals comprise a data signal, a control signal, a system message signal, or a reference signal.
10. The method of claim 7 , wherein the integer number of sub-groups is determined using a run-time condition of the wireless communication system.
11. The method of claim 10 , wherein run-time condition comprises at least one of a number of legacy user devices operating in the wireless communication system, characteristics of a channel over which the transmission is performed, and length of data transmitted over the transmission.
12. The method of claim 7 , wherein the receiving the transmission comprises receiving the signals modulated using an orthogonal time frequency space (OTFS) scheme, and wherein each subcarrier in each sub-group is assigned to a different OTFS frame.
13. A wireless signal transmission apparatus comprising a memory, a processor and transmission circuitry, the apparatus configured to implement a method in a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two-dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension, the method comprising:
receiving, a transmission on a wireless channel, a transmission comprising signals, wherein the signals are assigned according to delay-Doppler domain units; and
demodulating the signals occupying sub-groups of subcarriers corresponding to one of a sub-group of subcarriers in which each PRB is logically divided,
wherein each PRB is logically divided into an integer number of sub-groups of sub-carriers, wherein the integer number is greater than one.
14. The apparatus of claim 13 , wherein subcarriers in each sub-group are contiguous.
15. The apparatus of claim 13 , wherein the integer number of sub-groups is determined using a run-time condition of the wireless communication system, wherein run-time condition comprises at least one of a number of legacy user devices operating in the wireless communication system, characteristics of a channel over which the transmission is performed, and length of data transmitted over the transmission.
16. The apparatus of claim 13 , wherein the receiving the transmission comprises receiving the signals modulated using an orthogonal time frequency space (OTFS) scheme, and wherein each subcarrier in each sub-group is assigned to a different OTFS frame.