Measurement reporting in radio access networks for MU-MIMO operation

1. A method of operating an informing radio node in a radio access network, the method comprising:

transmitting beam reception information, the beam reception information being based on measurements performed on beams of a set of beams, wherein the beam reception information indicates one or more beams of the set of beams to belong to a first subset of the set of beams, the first subset comprising weakly received beams, wherein the transmitting of the beam reception information is transmitted responsive to a number of beams in the first subset being below a threshold number; and

for each of the one or more beams in the first subset, transmitting measurements that resulted in the one or more beams being placed in the first subset and identify which beam of the one or more beams is associated with the measurements.

2. A method according to claim 1 , wherein a beam is indicated to belong to the first subset based on a reception strength and/or quality.

3. A method according to claim 1 , wherein the beams of the set of beams are transmitted utilising different antenna arrangements.

4. A method according to claim 1 , wherein the beam reception information indicates one or more beams of the set to belong to a second subset of strongly received beams, which may comprise one or more beams.

5. A method according to claim 4 , wherein the beams of the set of beams are indicated to belong to the first subset and/or the second subset based on a threshold.

6. A method according to claim 1 , wherein the beams of the set of beams are identified or identifiable by a beam identity indication, in particular, reference signaling and/or a signaling pattern.

7. A method according to claim 1 , wherein the beam reception information indicates N beams to belong to the first subset, and M beams to belong to a second subset.

8. A method according to claim 1 , wherein the set of beams is configured.

9. A method according to claim 1 , wherein the beam reception information is provided in a measurement report.

10. An informing radio node for a radio access network, the informing radio node comprising:

processing circuitry, wherein the processing circuitry is adapted to,

transmit beam reception information, the beam reception information being based on measurements performed on a set of beams, wherein the beam reception information indicates one or more beams of the set of beams to belong to a first subset of the set of beams, the first subset comprising weakly received beams, wherein the transmitting of the beam reception information is transmitted responsive to a number of beams in the first subset being below a threshold number; and

for each of the one or more beams in the first subset, transmit measurements that resulted in the one or more beams being placed in the first subset and identify which beam of the one or more beams is associated with the measurements.

11. A method of operating a configuring radio node in a radio access network, the method comprising:

configuring a second radio node to transmit beam reception information responsive to a number of beams belonging to a first subset of a set of beams being below a first threshold, the beam reception information pertaining to a set of beams, wherein the beam reception information indicates one or more beams of the set of beams to belong to a first subset of the set of beams, the first subset comprising weakly received beams; and

configuring the second radio node to, for each of the one or more beams in the first subset, transmit measurements that resulted in the one or more beams being placed in the first subset and identify which beam of the one or more beams is associated with the measurements.

12. A method according to claim 11 , wherein a beam is indicated to belong to the first subset based on a reception strength and/or quality.

13. A method according to claim 11 , wherein the beams of the set of beams are transmitted utilising different antenna arrangements.

14. A method according to claim 11 , wherein the beam reception information indicates one or more beams of the set to belong to a second subset of strongly received beams, which may comprise one or more beams.

15. A method according to claim 14 , wherein the beams of the set of beams are indicated to belong to the first subset and/or the second subset based on a threshold.

16. A method according to claim 11 , wherein the beams of the set of beams are identified or identifiable by a beam identity indication, in particular, reference signaling and/or a signaling pattern.

17. A method according to claim 11 , wherein the beam reception information indicates N beams to belong to the first subset, and M beams to belong to a second subset.

18. A method according to claim 11 , wherein the set of beams is configured.

19. A method according to claim 11 , wherein the beam reception information is provided in a measurement report.

20. A method according to claim 11 , further comprising:

co-scheduling the second node and at least one more node for multiple user-multiple input multiple output, MU-MIMO, transmission based on the one or more beams in the first subset.

21. A configuring radio node for a radio access network, the configuring radio node being adapted for comprising:

processing circuitry, wherein the processing circuitry is adapted to,

configure a second radio node to transmit beam reception information responsive to a number of beams belonging to a first subset of a set of beams being below a first threshold, the beam reception information pertaining to the set of beams, wherein the beam reception information indicates one or more beams of the set of beams to belong to the first subset of the set of beams, the first subset comprising weakly received beams; and

configure the second radio node to, for each of the one or more beams in the first subset, transmit measurements that resulted in the one or more beams being placed in the first subset and identify which beam of the one or more beams is associated with the measurements.