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Paramétrages

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1. WO2020108929 - ATTRIBUTION DE PARAMÈTRES DE TRANSMISSION POUR DISPOSITIFS SANS FIL MU-MIMO

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CLAIMS

1. A method (200) implemented by a network node (120) for configuring a plurality of wireless devices (110) in a Multi-User Multiple-Input, Multiple-Output, MU-MIMO, wireless communication network (100) to receive transmissions from the network node (120), the method (200) comprising:

for each pair (130) of wireless devices, estimating (210) a channel correlation of a first channel between the network node (120) and one wireless device (110) in the pair (130) and a second channel between the network node (120) and the other wireless device (110) in the pair (130), where each pair (130) of wireless devices comprises one of all possible combinations of two of the plurality of wireless devices (110);

assigning (220) one of a plurality of transmission parameters to each of the plurality of wireless devices (110) responsive to the channel correlations to reduce interference between the plurality of wireless devices (110), each transmission parameter being a combination of a first identifier and a second identifier, the first and second identifiers used to code and/or decode a signal; and

configuring (230) each of the plurality of wireless devices (110) to receive transmissions

encoded with the assigned transmission parameter.

2. The method (200) of claim 1 wherein the first identifier is an antenna port identifier.

3. The method (200) of any one of claims 1-2 wherein the second identifier is a scrambling code identifier.

4. The method (200) of any one of claims 1-3 wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises assigning (222), to the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation, a first transmission parameter to one of the wireless devices (110 A) in the pair (130) and a second transmission parameter to the other of the wireless devices (110B) in the pair (130), the second transmission parameter having a different first identifier than the first transmission parameter.

5. The method (200) of any one of claims 1-3:

wherein the plurality of transmission codes comprises M unique transmission parameters; and

wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises assigning a different one of the M unique transmission parameters to each of up to M unique wireless devices (110) in the one or more pairs (130) of wireless devices having the highest channel correlations.

6. The method (200) of claim 5 wherein the transmission parameters assigned to at least the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation have different first identifiers.

7. The method (200) of any one of claims 5-6:

wherein the plurality of wireless devices (110) comprises more than M wireless devices; and wherein said assigning (220) one of the plurality of transmission parameters to each of the

plurality of wireless devices (110) further comprises reusing the M unique transmission parameters for the wireless devices (110) not yet assigned a transmission parameter responsive to the channel correlations.

8. The method (200) of claim 7, wherein said reusing the M unique transmission parameters comprises, for one or more additional pairs (130) of wireless devices having the next highest channel correlations and having M or fewer wireless devices (110) not yet assigned one of the plurality of transmission parameters, assigning, responsive to the channel conditions, a different one of the M unique transmission parameters to each of the M or fewer wireless devices (110) not already assigned one of the plurality of transmission parameters in the one or more additional pairs (130) of wireless devices.

9. The method (200) of any one of claims 1-3 wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises:

for the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation, assigning a first transmission parameter to one of the wireless devices (110 A) in the pair (130) and a second transmission parameter to the other of the wireless devices (110B) in the pair (130), the second transmission parameter having a different first identifier than the first transmission parameter;

for the wireless devices (110) in the one or more pairs (130) of wireless devices having the next highest channel correlation(s), assigning, responsive to the channel correlations, any remaining unassigned transmission parameters to the wireless devices (110) not yet

assigned a transmission parameter until all unique transmission parameters have been assigned; and

for any of the plurality of wireless devices (110) in the remaining pairs (130) of wireless devices having at least one unassigned wireless device (110), reusing the already assigned transmission parameters by assigning, responsive to the corresponding channel correlations, one of the already assigned plurality of transmission parameters to each of the remaining plurality of wireless devices (110) not yet assigned a transmission parameter until all of the plurality of wireless devices (110) are assigned a transmission parameter.

10. The method (200) of claim 9 wherein said assigning transmission parameters for the wireless devices (110) in the one or more pairs (130) of wireless devices having the next highest channel correlations comprises, for the wireless devices (110) in the one or more pairs (130) of wireless devices having the next highest channel correlation(s), assigning, responsive to the channel correlations, any remaining unassigned transmission parameters to the wireless devices (110) not yet assigned a transmission parameter such that the wireless devices (110) in the pairs (130) of wireless devices having the highest channel correlations have different first identifiers.

11. The method (200) of any one of claims 1-10 wherein the first identifier comprises one of two possible values and the second identifier comprises one of two possible values, and the plurality of transmission parameters comprises four unique transmission parameters from each unique combination of one of the values of the first identifier and one of the values of the second identifier.

12. The method (200) of claim 11 wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises assigning one of the plurality of transmission parameters to each of eight wireless devices (110) by:

for the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation, assigning a first transmission parameter to one of the wireless devices (110 A) in the pair (130) and a second transmission parameter to the other of the wireless devices (110B) in the pair (130), the second transmission parameter having a different first identifier and a different second identifier than the first transmission parameter; for the wireless devices (110) in the one or more of the pairs (130) of wireless devices having the next highest channel correlation(s) and having at least one unassigned wireless

device (110), assigning the two remaining unassigned transmission parameters to the two wireless devices (110) not yet assigned a transmission parameter until all four unique transmission parameters have been assigned; and

for any of the plurality of wireless devices (110) in the remaining pairs (130) of wireless devices having at least one unassigned wireless device (110), reusing the already assigned transmission parameters by assigning, responsive to the corresponding channel conditions, a different one of the already assigned four transmission parameters to each of the four remaining wireless devices (110) not yet assigned one of the plurality of transmission parameters.

13. The method (200) of any one of claims 4, 9-12 wherein the second transmission parameter further has a different second identifier than the first transmission parameter.

14. The method (200) of any one of claims 1-13 further comprising comparing each estimated channel correlation to a correlation threshold, wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises:

assigning different ones of the plurality of transmission parameters to the wireless devices (110) in each pair (130) of wireless devices having an estimated channel correlation that meets or exceeds the correlation threshold; and

assigning any of the plurality of transmission parameters to the wireless devices (110) in each pair (130) of wireless devices having an estimated channel correlation that is less than the correlation threshold.

15. The method (200) of any one of claims 1-14 wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises assigning (224), to the wireless devices (110) in the pair (130) of wireless devices having the lowest channel correlation, a first transmission parameter to one of the wireless devices (110 A) in the pair (130) and a second transmission parameter to the other of the wireless devices (110B) in the pair (130), the second transmission parameter being the same as the first transmission parameter.

16. The method (200) of claim 15 wherein the second transmission parameter further has the same second identifier as the first transmission parameter.

17. The method (200) of any one of claims 15-16 wherein the first identifier comprises one of two possible values and the second identifier comprises one of two possible values, and the plurality of transmission parameters comprises four unique transmission parameters from each unique combination of one of the values of the first identifier and one of the values of the second identifier.

18. The method (200) of claim 17 wherein said assigning (220) one of the plurality of transmission parameters to each of the plurality of wireless devices (110) comprises assigning one of the plurality of transmission parameters to each of eight wireless devices (110) by:

for the wireless devices (110) in the pair (130) of wireless devices having the lowest channel correlation, assigning one of the four transmission parameters to both of the wireless devices (110) in the pair (130);

for the wireless devices (110) in the pair (130) of wireless devices having the next lowest

channel correlation and having two unassigned wireless devices (110), assigning one of the three remaining unassigned transmission parameters to both of two wireless devices (110) in the pair (130);

for the wireless devices (110) in the pair (130) of wireless devices having the next lowest

channel correlation and having two unassigned wireless devices (110), assigning one of the two remaining unassigned transmission parameter to both of two wireless devices (110) in the pair (130); and

for the wireless devices (110) in the pair (130) of wireless devices having the next lowest

channel correlation and having two unassigned wireless devices (110), assigning the only remaining unassigned transmission parameter to both of two wireless devices (110) in the pair (130).

19. A network node (120) in a Multi-User Multiple-Input, Multiple-Output, MU-MIMO, wireless communication network (100) configured to send transmissions to a plurality of wireless devices (110), the network node (120) comprising processing circuitry (122) configured to execute the steps of any one of claims 1-18.

20. A computer program product for controlling a network node (120) in a Multi-User Multiple-Input, Multiple-Output, MU-MIMO, wireless communication network (100) configured to send transmissions to a plurality of wireless devices (110), the computer program product comprising software instructions which, when run on processing circuitry (122) in the network node (120), causes the network node (120) to execute the method according to any one of claims 1-18.

21. A computer-readable medium comprising the computer program product of claim 20.

22. The computer-readable medium of claim 21 wherein the computer-readable medium comprises a non-transitory computer readable medium.

23. A network node (120) for configuring a plurality of wireless devices in a Multi-User Multiple-Input, Multiple-Output (MU-MIMO) wireless communication network to receive transmissions from the network node, the network node (120) comprising:

a channel correlation circuit (140) configured to, for each pair (130) of wireless devices,

estimate a channel correlation of a first channel between the network node (120) and one wireless device (110) in the pair (130) and a second channel between the network node (120) and the other wireless device (110) in the pair (130), where each pair (130) of wireless devices comprises one of all possible combinations of two of the plurality of wireless devices (110);

an assignment circuit (142) configured to assign one of a plurality of transmission parameters to each of the plurality of wireless devices (110) responsive to the channel correlations to reduce interference between the plurality of wireless devices (110), each transmission parameter being a combination of a first identifier and a second identifier, the first and second identifiers used to code and/or decode a signal; and

a configuration circuit (144) configured to configure each of the plurality of wireless devices (110) to receive transmissions encoded with the assigned transmission parameter.

24. The network node (120) of claim 23 wherein the first identifier is an antenna port identifier.

25. The network node (120) of claim 23 wherein the second identifier is a scrambling code identifier.

26. The network node (120) of claim 23 wherein the assignment circuit assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by assigning, to the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation, a first transmission parameter to one of the wireless devices (110) in the pair (130) and a second transmission parameter to the other of the wireless devices (110) in the pair (130), the second transmission parameter having a different first identifier than the first transmission parameter.

27. The network node (120) of claim 26 wherein the second transmission parameter further has a different second identifier than the first transmission parameter.

28. The network node (120) of claim 23:

wherein the plurality of transmission codes comprises M unique transmission parameters; and wherein the assignment circuit (142) assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by assigning a different one of the M unique transmission parameters to each of up to M unique wireless devices (110) in the one or more pairs (130) of wireless devices having the highest channel correlations.

29. The network node (120) of claim 28 wherein the transmission parameters assigned to at least the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation have different first identifiers.

30. The network node (120) of claim 28:

wherein the plurality of wireless devices (110) comprises more than M wireless devices (110); and

wherein the assignment circuit (142) further assigns one of the plurality of transmission

parameters to each of the plurality of wireless devices (110) by reusing the M unique transmission parameters for the wireless devices (110) not yet assigned a transmission parameter responsive to the channel correlations.

31. The network node (120) of claim 30, wherein the assignment circuit (142) reuses the M unique transmission parameters by, for one or more additional pairs (130) of wireless devices having the next highest channel correlations and having M or fewer wireless devices (110) not yet assigned one of the plurality of transmission parameters, assigning, responsive to the channel conditions, a different one of the M unique transmission parameters to each of the M or fewer wireless devices (110) not already assigned one of the plurality of transmission parameters in the one or more additional pairs (130) of wireless devices (110).

32. The network node (120) of claim 23 wherein the assignment circuit (142) assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by:

for the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation, assigning a first transmission parameter to one of the wireless devices (110) in the pair (130) and a second transmission parameter to the other of the wireless devices (110) in the pair (130), the second transmission parameter having a different first identifier than the first transmission parameter;

for the wireless devices (110) in the one or more pairs (130) of wireless devices having the next highest channel correlation(s), assigning, responsive to the channel correlations, any remaining unassigned transmission parameters to the wireless devices (110) not yet assigned a transmission parameter until all unique transmission parameters have been assigned; and

for any of the plurality of wireless devices (110) in the remaining pairs (130) of wireless devices having at least one unassigned wireless device (110), reusing the already assigned transmission parameters by assigning, responsive to the corresponding channel correlations, one of the already assigned plurality of transmission parameters to each of the remaining plurality of wireless devices (110) not yet assigned a transmission parameter until all of the plurality of wireless devices (110) are assigned a transmission parameter.

33. The network node (120) of claim 32 wherein the assignment circuit (142) assigns transmission parameters for the wireless devices (110) in the one or more pairs (130) of wireless devices having the next highest channel correlations by, for the wireless devices (110) in the one or more pairs (130) of wireless devices having the next highest channel correlation(s), assigning, responsive to the channel correlations, any remaining unassigned transmission parameters to the wireless devices (110) not yet assigned a transmission parameter such that the wireless devices (110) in the pairs (130) of wireless devices having the highest channel correlations have different first identifiers.

34. The network node (120) of claim 32 wherein the second transmission parameter further has a different second identifier than the first transmission parameter.

35. The network node (120) of claim 23 wherein the first identifier comprises one of two possible values and the second identifier comprises one of two possible values, and the plurality of transmission parameters comprises four unique transmission parameters from each unique combination of one of the values of the first identifier and one of the values of the second identifier.

36. The network node (120) of claim 35 wherein the assignment circuit (142) assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by assigning one of the plurality of transmission parameters to each of eight wireless devices (110) by:

for the wireless devices (110) in the pair (130) of wireless devices having the highest channel correlation, assigning a first transmission parameter to one of the wireless devices (110) in the pair (130) and a second transmission parameter to the other of the wireless devices (110) in the pair (130), the second transmission parameter having a different first identifier and a different second identifier than the first transmission parameter; for the wireless devices (110) in the one or more of the pairs (130) of wireless devices having the next highest channel correlation(s) and having at least one unassigned wireless device (110), assigning the two remaining unassigned transmission parameters to the two wireless devices (110) not yet assigned a transmission parameter until all four unique transmission parameters have been assigned; and

for any of the plurality of wireless devices (110) in the remaining pairs (130) of wireless devices having at least one unassigned wireless device (110), reusing the already assigned transmission parameters by assigning, responsive to the corresponding channel conditions, a different one of the already assigned four transmission parameters to each of the four remaining wireless devices (110) not yet assigned one of the plurality of transmission parameters.

37. The network node (120) of claim 35 wherein the second transmission parameter further has a different second identifier than the first transmission parameter.

38. The network node (120) of claim 23 wherein the assignment circuit (142) is further configured to compare each estimated channel correlation to a correlation threshold, wherein the assignment circuit (142) assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by:

assigning different ones of the plurality of transmission parameters to the wireless devices (110) in each pair (130) of wireless devices having an estimated channel correlation that meets or exceeds the correlation threshold; and

assigning any of the plurality of transmission parameters to the wireless devices (110) in each pair (130) of wireless devices having an estimated channel correlation that is less than the correlation threshold.

39. The network node (120) of claim 23 wherein the assignment circuit (142) assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by assigning, to the wireless devices (110) in the pair (130) of wireless devices having the lowest channel correlation, a first transmission parameter to one of the wireless devices (110) in the pair (130) and a second transmission parameter to the other of the wireless devices (110) in the pair (130), the second transmission parameter being the same as the first transmission parameter.

40. The network node (120) of claim 39 wherein the second transmission parameter further has the same second identifier as the first transmission parameter.

41. The network node (120) of claim 39 wherein the first identifier comprises one of two possible values and the second identifier comprises one of two possible values, and the plurality of transmission parameters comprises four unique transmission parameters from each unique combination of one of the values of the first identifier and one of the values of the second identifier.

42. The network node (120) of claim 41 wherein the assignment circuit (142) assigns one of the plurality of transmission parameters to each of the plurality of wireless devices (110) by assigning one of the plurality of transmission parameters to each of eight wireless devices (110) by:

for the wireless devices (110) in the pair (130) of wireless devices having the lowest channel correlation, assigning one of the four transmission parameters to both of the wireless devices (110) in the pair (130);

for the wireless devices (110) in the pair (130) of wireless devices having the next lowest

channel correlation and having two unassigned wireless devices (110), assigning one of the three remaining unassigned transmission parameters to both of the wireless devices (110) in the pair (130); and

for the wireless devices (110) in the pair (130) of wireless devices having the next lowest

channel correlation and having two unassigned wireless device (110), assigning one of the two remaining unassigned transmission parameters to both of the wireless devices (110) in the pair (130); and

for the wireless devices (110) in the pair (130) of wireless devices having the next lowest channel correlation and having two unassigned wireless device (110), assigning the only remaining unassigned transmission parameters to both of the wireless devices (110) in the pair (130).