Channel state information (CSI) feedback with multiple hypotheses
A method, wireless device and network node for CSI feed-back with multiple interference hypotheses are disclosed. According to one aspect, a method implemented in a wireless device (WD) includes receiving a configuration for Channel State Information (CSI) measurement including a first Non-Zero Power Channel State Information-Reference Signal (NZP CSI-RS) resource set for channel measurement and a second NZP CSI-RS resource set for interference measurement, the first NZP CSI-RS resource set having only one NZP CSI-RS resource. The method also includes measuring CSI based on the first and the second NZP CSI-RS resource sets.
1. A method implemented in a wireless device, WD, configured to communicate with a network node, the method comprising:
receiving from the network node a configuration for Channel State Information, CSI, measurement including a first Non-Zero Power Channel State Information-Reference Signal, NZP CSI-RS, resource set for channel measurement and a second NZP CSI-RS resource set for interference measurement, the first NZP CSI-RS resource set having at least one NZP CSI-RS resource, the second NZP CSI-RS resource set having a plurality of NZP CSI-RS resources and being configured for a pairing of the WD with other WDs that produces a lower interference than is achieved with a different pairing of WDs;
accumulating interferences measured on each of the plurality of NZP CSI-RS resources of the second NZP CSI-RS resource set; and
measuring CSI based on the first and the second NZP CSI-RS resource sets, the CSI measurement being based at least in part on the accumulated interferences measured on the plurality of NZP CSI-RS resources of the second NZP CSI-RS resource set, the measured CSI based on the second NZP CSI-RS resource set being indicative of a level of interference when the WD is paired with other WDs; and
transmitting an indication of the accumulated interferences to the network node.
2. The method of claim 1 , further comprising reporting the CSI measurement without reporting a CSI-RS resource index, CRI.
3. The method of claim 1 , further comprising reporting the CSI measurement.
4. A wireless device, WD, configured to communicate with a network node, comprising processing circuitry configured to:
receive from the network node a configuration for Channel State Information, CSI, measurement including a first Non-Zero Power Channel State Information-Reference Signal, NZP CSI-RS, resource set for channel measurement and a second NZP CSI-RS resource set for interference measurement, the first NZP CSI-RS resource set having at least one NZP CSI-RS resource, the second NZP CSI-RS resource set having a plurality of NZP CSI-RS resources and being configured for a pairing of the WD with other WDs that produces a lower interference than is achieved with a different pairing of WDs;
accumulating interferences measured on each of the plurality of NZP CSI-RS resources of the second NZP CSI-RS resource set; and
measure CSI based on the first and the second NZP CSI-RS resource sets, the CSI measurement being based at least in part on the accumulated interferences measured on the plurality of NZP CSI-RS resources of the second NZP CSI-RS resource set, the measured CSI based on the second NZP CSI-RS resource set being indicative of a level of interference when the WD is paired with other WDs; and
causing transmission of an indication of the accumulated interferences to the network node.
5. The WD of claim 4 , wherein the processing circuitry is further configured to report the CSI measurement without reporting a CSI-RS resource index, CRI.
6. The WD of claim 4 , wherein the processing circuitry is further configured to report the CSI measurement.
7. A method implemented in a network node configured to communicate with a wireless device, WD, the method comprising:
determining a configuration for Channel State Information, CSI, measurement including a first Non-Zero Power Channel State Information—Reference Signal, NZP CSI-RS, resource set for channel measurement and a second NZP CSI-RS resource set for interference measurement, the first NZP CSI-RS resource set having at least one NZP CSI-RS resource, the second NZP CSI-RS resource set having a plurality of NZP CSI-RS resources, the configuration being determined for a particular pairing of WDs that produces a lower interference than is achieved with a different pairing of WDs; and
receiving from the WD, CSI that is based at least in part on the first and the second NZP CSI-RS resource sets and an accumulation of interferences measured by the WD on the NZP CSI-RS resources in the second NZP CSI-RS resource set.
8. The method of claim 7 , wherein the CSI is received without a reporting of a CSI-RS resource index, CRI.
9. A network node configured to communicate with a wireless device, WD, comprising processing circuitry configured to:
determine a configuration for Channel State Information, CSI, measurement including a first Non-Zero Power Channel State Information —Reference Signal, NZP CSI-RS, resource set for channel measurement and a second NZP CSI-RS resource set for interference measurement, the first NZP CSI-RS resource set having at least one NZP CSI-RS resource, the second NZP CSI-RS resource set having a plurality of NZP CSI-RS resources, the configuration being determined for a particular pairing of WDs that produces a lower interference than is achieved with a different pairing of WDs; and
receive from the WD, CSI that is based at least in part on the first and the second NZP CSI-RS resource sets and an accumulation of interferences measured by the WD on the NZP CSI-RS resources in the second NZP CSI-RS resource set.
10. The network node of claim 9 , wherein the CSI is received without a reporting of a CSI-RS resource index, CRI.