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1. WO2020136416 - CONFIGURATION AND RESOURCE ALLOCATION FOR DOWNLINK DEMODULATION REFERENCE SIGNALS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

What is claimed is:

1. A network node (16), comprising:

processing circuitry (36) configured to:

allocate resources for a reference signal signaling for a first wireless device (22), the allocated resources configured to separate, in a slot, at least one transmission layer of the first wireless device (22) from at least one transmission layers of a second wireless device (22) by at least one of:

scheduling the first wireless device (22) and second wireless device (22) on different reference signal ports that are separated by using the same resource elements and different code division multiplexing, CDM, codes, the first wireless device (22) and second wireless device (22) having associated scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) on at least one shared reference signal port using the same resource elements and CDM code, the first wireless device (22) and second wireless device (22) having different scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) on different reference signal ports that are separated by frequency division multiplexing, FDM, using different resource elements and the same CDM codes, the first and second wireless device (22) having associated scrambling sequences; and scheduling the first wireless device (22) and second wireless device (22) on different reference signal ports that are separated through both FDM and CDM by using different resource elements and different CDM codes, the first wireless device (22) and second wireless device (22) having associated scrambling sequences.

2. The network node (16) of Claim 1, wherein the first wireless device (22) and the second wireless device (22) having the at least one shared reference signal port are part of a wireless device sub-group, the wireless device sub-group meeting at least one predefined spatial condition.

3. The network node (16) of Claim 2, wherein at least one predefined spatial condition includes a spatial metric associated with each wireless device (22) within the subgroup that meets a predefined criterion with respect to all other wireless devices (22) in the same subgroup.

4. The network node (16) of Claim 3, wherein the spatial metric is a measure of an angle of arrival, AoA, between a wireless device (22) and a plane of an antenna array of the network node (16).

5. The network node (16) of Claim 3, wherein the spatial metric is a measure of a spatial channel of a wireless device (22) within a subgroup with respect to the network node (16).

6. The network node (16) of Claim 3, wherein the predefined criterion is associated with a difference of spatial metrics between two wireless devices (22) that is greater than a predefined threshold.

7. The network node (16) of Claim 3, wherein the predefined criterion is associated with an absolute value of an inner product of the normalized spatial metrics of any two wireless devices (22) that is less than a predefined threshold.

8. The network node (16) of any one of Claims 1-7, wherein the allocated resources provide for multi-user multiple-input multiple-output, MU-MIMO, transmission.

9. The network node (16) of any one of Claims 1-8, wherein the number of reference signal ports corresponds to a rank of the transmission of the first wireless device (22).

10. The network node (16) of any one of Claims 1-9, wherein the processing circuitry (36) is further configured to determine a number of physical resource blocks, PRBs, allocated to the first wireless device (22), the scheduling of the at least one shared reference port to the first wireless device (22) and second wireless device (22) being based on the determined number of PRBs.

11. The network node (16) of any one of Claims 1-10, wherein the first wireless device (22) is scheduled for a reference signal port combination for one selected from a group consisting of:

a one front-load reference signal symbol configuration; and

a two front-load reference signal symbol configuration.

12. The network node (16) of any one of Claims 1-11, wherein the processing circuitry (36) is further configured to:

allocate resources for reference signal signaling for a plurality of wireless devices (22) including the first wireless device (22), the allocated resources configured to separate, in a slot, at least one transmission layer of each of the plurality of wireless devices (22) from each other, respectively.

13. A method for a network node (16), the method comprising:

allocating (S100) resources for a reference signal signaling for a first wireless device (22), the allocated resources configured to separate, in a slot, at least one transmission layer of the first wireless device (22) from at least one transmission layers of a second wireless device (22) by at least one of:

scheduling the first wireless device (22) and second wireless device (22) on different reference signal ports that are separated by using the same resource elements and different code division multiplexing, CDM, codes, the first wireless device (22) and second wireless device (22) having associated scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) on at least one shared reference signal port using the same resource elements and CDM code, the first wireless device (22) and second wireless device (22) having different scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) on different reference signal ports that are separated by frequency division

multiplexing, FDM, by using different resource elements and the same CDM codes, the first and second wireless device (22) having associated scrambling sequences; and scheduling the first wireless device (22) and second wireless device (22) on different reference signal ports that are separated through both FDM and CDM by using different resource elements and different CDM codes, the first wireless device (22) and second wireless device (22) having associated scrambling sequences.

14. The method of Claim 13, wherein the first wireless device (22) and the second wireless device (22) having the at least one shared reference signal port are part of a wireless device sub-group, the wireless device sub-group meeting at least one predefined spatial condition.

15. The method of Claim 14, wherein at least one predefined spatial condition includes a spatial metric associated with each wireless device (22) within the subgroup that meets a predefined criterion with respect to all other wireless devices (22) in the same subgroup.

16. The method of Claim 15, wherein the spatial metric is a measure of an angle of arrival, AoA, between a wireless device (22) and a plane of an antenna array of the network node (16).

17. The method of Claim 15, wherein the spatial metric is a measure of a spatial channel of a wireless device (22) within a subgroup with respect to the network node (16).

18. The method of Claim 15, wherein the predefined criterion is associated with a difference of spatial metrics between two wireless devices (22) that is greater than a predefined threshold.

19. The method of Claim 15, wherein the predefined criterion is associated with an absolute value of an inner product of the normalized spatial metrics of any two wireless devices (22) that is less than a predefined threshold.

20. The method of any one of Claims 13-19, wherein the allocated resources provide for multi-user multiple-input multiple-output, MU-MIMO, transmission.

21. The method of any one of Claims 13-20, wherein the number of reference signal ports corresponds to a rank of the transmission of the first wireless device (22).

22. The method of any one of Claims 13-21, further comprising determining a number of physical resource blocks, PRBs, allocated to the first wireless device (22), the scheduling of the at least one shared reference port to the first wireless device (22) and second wireless device (22) being based on the determined number of PRBs.

23. The method of any one of Claims 13-22, wherein the first wireless device (22) is scheduled for a reference signal port combination for one selected from a group consisting of:

a one front-load reference signal symbol configuration; and

a two front-load reference signal symbol configuration.

24. The method of any one of Claims 13-23, further comprising allocating resources for reference signal signaling for a plurality of wireless devices (22) including the first wireless device (22), the allocated resources configured to separate, in a slot, at least one transmission layer of each of the plurality of wireless devices (22) from each other, respectively.

25. A network node (16), comprising:

processing circuitry (36) configured to:

allocate resources for demodulation reference signal, DMRS, signaling for a first wireless device (22), the allocated resources configured to separate, in a slot, at least one transmission layer of the first wireless device (22) from at least one transmission layers of a second wireless device (22) by at least one of:

scheduling the first wireless device (22) and second wireless device (22) different DMRS ports that are separated by using the same resource elements and different code division multiplexing, CDM, codes, the first wireless device (22) and second wireless device (22) having associated scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) at least one shared DMRS port using the same resource elements and CDM code, the first wireless device (22) and second wireless device (22) having different scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) on different DMRS ports that are separated by frequency division multiplexing, FDM, by using different resource elements and the same CDM codes, the first and second wireless device (22) having associated scrambling sequences;

scheduling the first wireless device (22) and second wireless device (22) on different DMRS ports that are separated through both FDM and CDM by using different resource elements and different CDM codes, the first wireless device (22) and second wireless device (22) having associated scrambling sequences; and

participate in one selected from a group consisting of single-user multiple-input multiple-output, SU-MIMO, and multi-user-MIMO, MU-MIMO, based at least in part on the allocated resources for DMRS signaling.