Interference randomization for uplink signaling
A method for transmitting an acknowledgement/negative acknowledgement is described. Cell-specific symbol-level cyclic shift hopping is applied to data single-carrier frequency division multiplexing symbols of the acknowledgement/negative acknowledgement. A discrete Fourier transform is applied to the data single-carrier frequency division multiplexing symbols. Cell-specific symbol-level phase hopping is applied to the data single-carrier frequency division multiplexing symbols. The data single-carrier frequency division multiplexing symbols are transmitted in a slot.
1. A method for transmitting an acknowledgement/negative acknowledgement, comprising:
generating a cell-specific cyclic shift;
applying cell-specific symbol-level phase hopping to single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level phase hopping is based at least in part on the cell-specific cyclic shift;
applying cell-specific symbol-level cyclic shift hopping to the single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level cyclic shift hopping is based at least in part on the cell-specific cyclic shift;
applying a discrete Fourier transform to the single-carrier frequency division multiplexing data symbols; and
transmitting the single-carrier frequency division multiplexing data symbols in a slot.
2. The method of claim 1 , wherein the cell-specific symbol-level phase hopping is applied to single-carrier frequency division multiplexing data symbols before a discrete Fourier transform.
3. The method of claim 1 , wherein the cell-specific symbol-level phase hopping is applied to single-carrier frequency division multiplexing data symbols after a discrete Fourier transform.
4. The method of claim 1 , wherein an effective orthogonal cover code applied to a subcarrier is
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5. The method of claim 4 , wherein Q is an integer.
6. The method of claim 1 , wherein the cell-specific symbol-level phase hopping is a function of a Cell ID, and wherein the cell-specific symbol-level phase hopping reduces a chance of coherent combining of an interferer's signal.
7. The method of claim 1 , wherein the single-carrier frequency division multiplexing data symbols are transmitted in a slot using physical uplink control channel Format 3.
8. The method of claim 1 , wherein the cell-specific cyclic shift is generated at least based on a symbol index l or a slot index n s , which is given by n cs cell (n s ,l).
9. The method of claim 8 , wherein the cell-specific symbol-level phase hopping is generated based on └n cs cell (n s ,l)/G┘, where G is an integer.
10. The method of claim 8 , wherein the cell-specific symbol-level cyclic-shift hopping is given by n cs cell (n s ,l).
11. The method of claim 1 , further comprising:
generating a theta sequence for the cell-specific symbol-level phase hopping; and
applying the theta sequence to each single-carrier frequency division multiplexing data symbol as part of an orthogonal cover code.
12. A wireless device configured for transmitting an acknowledgement/negative acknowledgement, comprising:
a processor;
memory in electronic communication with the processor;
instructions stored in the memory, the instructions being executable by the processor to:
generate a cell-specific cyclic shift;
apply cell-specific symbol-level phase hopping to single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level phase hopping is based at least in part on the cell-specific cyclic shift;
apply cell-specific symbol-level cyclic shift hopping to the single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level cyclic shift hopping is based at least in part on the cell-specific cyclic shift;
apply a discrete Fourier transform to the single-carrier frequency division multiplexing data symbols; and
transmit the single-carrier frequency division multiplexing data symbols in a slot.
13. The wireless device of claim 12 , wherein the cell-specific symbol-level phase hopping is applied to single-carrier frequency division multiplexing data symbols before a discrete Fourier transform.
14. The wireless device of claim 12 , wherein the cell-specific symbol-level phase hopping is applied to single-carrier frequency division multiplexing data symbols after a discrete Fourier transform.
15. The wireless device of claim 12 , wherein an effective orthogonal cover code applied to a subcarrier is
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16. The wireless device of claim 15 , wherein Q is an integer.
17. The wireless device of claim 12 , wherein the cell-specific symbol-level phase hopping is a function of a Cell ID, and wherein the cell-specific symbol-level phase hopping reduces a chance of coherent combining of an interferer's signal.
18. The wireless device of claim 12 , wherein the single-carrier frequency division multiplexing data symbols are transmitted in a slot using physical uplink control channel Format 3.
19. A method for receiving an acknowledgement/negative acknowledgement from a user equipment, the method comprising:
receiving an acknowledgement/negative acknowledgement that is physical uplink control channel Format 3 with cell-specific symbol-level phase hopping from the user equipment, wherein the cell-specific symbol-level phase hopping is based at least in part on a cell-specific cyclic shift generated by the user equipment;
performing a corresponding despreading according to an applied hopping phase for each single-carrier frequency division multiplexing symbol; and
decoding the acknowledgement/negative acknowledgement.
20. The method of claim 19 , wherein the method is performed by a base station.
21. The method of claim 20 , wherein an effective orthogonal cover code applied to a subcarrier is
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22. A wireless device configured for receiving an acknowledgement/negative acknowledgement, comprising:
a processor;
memory in electronic communication with the processor;
instructions stored in the memory, the instructions being executable by the processor to:
receive an acknowledgement/negative acknowledgement that is physical uplink control channel Format 3 with cell-specific symbol-level phase hopping from a user equipment, wherein the cell-specific symbol-level phase hopping is based at least in part on a cell-specific cyclic shift generated by the user equipment;
perform a corresponding despreading according to an applied hopping phase for each single-carrier frequency division multiplexing symbol; and
decode the acknowledgement/negative acknowledgement.
23. The wireless device of claim 22 , wherein the wireless device is a base station.
24. The wireless device of claim 22 , wherein an effective orthogonal cover code applied to a subcarrier is
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25. A wireless device configured for transmitting an acknowledgement/negative acknowledgement, comprising:
means for generating a cell-specific cyclic shift;
means for applying cell-specific symbol-level phase hopping to single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level phase hopping is based at least in part on the cell-specific cyclic shift;
means for applying cell-specific symbol-level cyclic shift hopping to the single-carrier frequency division multiplexing symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level cyclic shift hopping is based at least in part on the cell-specific cyclic shift;
means for applying a discrete Fourier transform to the single-carrier frequency division multiplexing data symbols; and
means for transmitting the single-carrier frequency division multiplexing data symbols in a slot.
26. A computer-program product for transmitting an acknowledgement/negative acknowledgement, the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions comprising:
code for causing a user equipment to generate a cell-specific cyclic shift;
code for causing a user equipment to apply cell-specific symbol-level phase hopping to single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level phase hopping is based at least in part on the cell-specific cyclic shift;
code for causing a user equipment to apply cell-specific symbol-level cyclic shift hopping to the single-carrier frequency division multiplexing data symbols of the acknowledgement/negative acknowledgement, wherein the cell-specific symbol-level cyclic shift hopping is based at least in part on the cell-specific cyclic shift;
code for causing the user equipment to apply a discrete Fourier transform to the single-carrier frequency division multiplexing data symbols; and
code for causing the user equipment to transmit the single-carrier frequency division multiplexing data symbols in a slot.
27. A wireless device configured for receiving an acknowledgement/negative acknowledgement from a user equipment, comprising:
means for receiving an acknowledgement/negative acknowledgement that is physical uplink control channel Format 3 with cell-specific symbol-level phase hopping from the user equipment, wherein the cell-specific symbol-level phase hopping is based at least in part on a cell-specific cyclic shift generated by the user equipment;
means for performing a corresponding despreading according to an applied hopping phase for each single-carrier frequency division multiplexing symbol; and
means for decoding the acknowledgement/negative acknowledgement.
28. A computer-program product for receiving an acknowledgement/negative acknowledgement from a user equipment, the computer-program product comprising a non-transitory computer-readable medium having instructions thereon, the instructions comprising:
code for causing a base station to receive an acknowledgement/negative acknowledgement that is physical uplink control channel Format 3 with cell-specific symbol-level phase hopping from the user equipment, wherein the cell-specific symbol-level phase hopping is based at least in part on a cell-specific cyclic shift generated by the user equipment;
code for causing the base station to perform a corresponding despreading according to an applied hopping phase for each single-carrier frequency division multiplexing symbol; and
code for causing the base station to decode the acknowledgement/negative acknowledgement.
29. The wireless device of claim 12 , wherein the cell-specific cyclic shift is generated at least based on a symbol index l or a slot index n s , which is given by n cs cell (n s ,l).
30. The wireless device of claim 29 , wherein the cell-specific symbol-level phase hopping is generated based on └n cs cell (n s ,l)/G┘, where G is an integer.
31. The wireless device of claim 29 , wherein the cell-specific symbol-level cyclic-shift hopping is given by n cs cell (n s ,l).
32. The wireless device of claim 12 , wherein the instructions stored in the memory are further executable by the processor to:
generate a theta sequence for the cell-specific symbol-level phase hopping; and
apply the theta sequence to each single-carrier frequency division multiplexing data symbol as part of an orthogonal cover code.