Interference Measurement in Wireless Networks

Abstract

Embodiments contemplate methods, systems, and apparatuses for interference measurement in a wireless communication network, including wireless communication networks the employ MIMO in uplink and/or downlink communication. Embodiments contemplate identifying one or more interference measurement resource elements that may be received from one or more transmission points. Embodiments also contemplate performing interference measurement estimation based at least in part on the identified one or more interference measurement resource elements. Channel state information (CSI) perhaps in the form of reports may be generated based at least in part on the one or more interference measurement estimation. Embodiments also contemplate that the CSI report may be transmitted to one or more nodes. In some embodiments, the one or more interference measurement resource elements may be received as part of a set of resource elements.

1 .- 20 . (canceled) 
     
     
         21 . A wireless transmit/receive unit (WTRU) comprising:
 a processor, the processor configured at least with:
 a first channel state information (CSI) process, the first CSI process including:
 a first configuration of non-zero-power (NZP) CSI reference signal (CSI-RS) resources, the first configuration of NZP CSI-RS resources including a set of resources configured to measure a first energy; and 
 a first configuration of (CSI) interference measurement (CSI-IM) resources, the first configuration of CSI-IM resources including a first set of resource elements configured to measure a second energy; and 
 
 a second CSI process, the second CSI process including:
 the first configuration of NZP CSI-RS resources; and 
 a second configuration of CSI-IM resources, the second configuration of CSI-IM resources including a second set of resource elements configured to measure a third energy; and 
 
   a receiver, the receiver configured at least to:
 receive the second energy in the first set of resource elements; and 
 receive the third energy in the second set of resource elements, the processor being further configured to: 
 measure interference corresponding to the first CSI process based at least on the received second energy; and 
 measure interference corresponding to the second CSI process based at least on the received third energy. 
   
     
     
         22 . The WTRU of  claim 21 , wherein the processor is further configured to:
 determine a first CSI report corresponding to the first CSI process; and   determine a second CSI report corresponding to the second CSI process.   
     
     
         23 . The WTRU of  claim 22 , further comprising a transmitter, the transmitter configured at least to:
 send at least one of the first CSI report, or the second CSI report, to one or more nodes of a communication network.   
     
     
         24 . The WTRU of  claim 22 , wherein the receiver is further configured to receive the first energy in the set of resources, and the processor is further configured such that:
 the first CSI report is based at least on the received first energy and the measured interference corresponding to the first CSI process; and   the second CSI report is based at least on the received first energy and the measured interference corresponding to the second CSI process.   
     
     
         25 . The WTRU of  claim 21 , wherein the processor is further configured such that the first energy is considered as a first signal energy, the second energy is considered as a first interference energy, and the third energy is considered as a second interference energy. 
     
     
         26 . The WTRU of  claim 21 , wherein the processor is further configured such that:
 the first set of resource elements includes a set of resource elements of a first zero-power (ZP) CSI-RS configuration; and   the second set of resource elements includes a set of resource elements of a second ZP CSI-RS configuration.   
     
     
         27 . The WTRU of  claim 21 , wherein the processor is further configured such that:
 the first configuration of CSI-IM resources includes at least one of: a first resourceConfig or a first subframeConfig; and   the second configuration of CSI-IM resources includes at least one of: a second resourceConfig or a second subframeConfig.   
     
     
         28 . The WTRU of  claim 21 , wherein the processor is further configured to determine from a downlink control information (DCI) assignment one or more physical downlink shared channel (PDSCH) resource elements not used for PDSCH transmission. 
     
     
         29 . An evolved Node-B (eNB), comprising:
 a processor, the processor configured at least to:   determine a first channel state information (CSI) process, the first CSI process including:
 a first configuration of non-zero-power (NZP) CSI reference signal (CSI-RS) resources, the first configuration of NZP CSI-RS resources including a set of resources configured to measure a first energy; and 
 a first configuration of (CSI) interference measurement (CSI-IM) resources, the first configuration of CSI-IM resources including a first set of resource elements configured to measure a second energy; and 
   determine a second CSI process, the second CSI process including:
 the first configuration of NZP CSI-RS resources; and 
 a second configuration of CSI-IM resources, the second configuration of CSI-IM resources including a second set of resource elements configured to measure a third energy; and 
   a transmitter, the transmitter configured at least to:   send a CSI reporting configuration to at least one wireless transmit/receive unit (WTRU), the CSI reporting configuration including information corresponding to the first CSI process and the second CSI process.   
     
     
         30 . The eNB of  claim 29 , wherein the processor is further configured to indicate in a downlink control information (DCI) assignment one or more physical downlink shared channel (PDSCH) resource elements not used for PDSCH transmission. 
     
     
         31 . The eNB of  claim 29 , wherein the processor is further configured such that:
 the first set of resource elements includes a set of resource elements of a first zero-power (ZP) CSI-RS configuration; and   the second set of resource elements includes a set of resource elements of a second ZP CSI-RS configuration.   
     
     
         32 . The eNB of  claim 29 , wherein the processor is further configured such that the first energy is considered as a first signal energy, the second energy is considered as a first interference energy, and the third energy is considered as a second interference energy. 
     
     
         33 . The eNB of  claim 29 , wherein the processor is further configured such that:
 the first configuration of CSI-IM resources includes at least one of: a first resourceConfig or a first subframeConfig; and   the second configuration of CSI-IM resources includes at least one of: a second resourceConfig or a second subframeConfig.   
     
     
         34 . A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
 receiving, via a receiver, a configuration including:
 a first channel state information (CSI) process, the first CSI process including:
 a first configuration of non-zero-power (NZP) CSI reference signal (CSI-RS) resources, the first configuration of NZP CSI-RS resources including a set of resources configured to measure a first energy; and 
 a first configuration of (CSI) interference measurement (CSI-IM) resources, the first configuration of CSI-IM resources including a first set of resource elements configured to measure a second energy; and 
 
 a second CSI process, the second CSI process including:
 the first configuration of NZP CSI-RS resources; and 
 a second configuration of CSI-IM resources, the second configuration of CSI-IM resources including a second set of resource elements configured to measure a third energy; 
 
   receiving the second energy in the first set of resource elements;   receiving the third energy in the second set of resource elements;   measuring interference corresponding to the first CSI process based at least on the received second energy; and   measuring interference corresponding to the second CSI process based at least on the received third energy.   
     
     
         35 . The method of  claim 34 , further comprising:
 determining a first CSI report corresponding to the first CSI process; and   determining a second CSI report corresponding to the second CSI process.   
     
     
         36 . The method of  claim 35 , further comprising:
 sending, via a transmitter, at least one of the first CSI report, or the second CSI report, to one or more nodes of a communication network.   
     
     
         37 . The method of  claim 35 , further comprising:
 receiving the first energy in the set of resources, wherein the determining the first CSI report is based at least on the received first energy and the measured interference corresponding to the first CSI process, and the determining the second CSI report is based at least on the received first energy and the measured interference corresponding to the second CSI process.   
     
     
         38 . The method of  claim 34 , wherein the first energy is considered as a first signal energy, the second energy is considered as a first interference energy, and the third energy is considered as a second interference energy. 
     
     
         39 . The method of  claim 34 , wherein the first set of resource elements includes a set of resource elements of a first zero-power (ZP) CSI-RS configuration, and the second set of resource elements includes a set of resource elements of a second ZP CSI-RS configuration. 
     
     
         40 . The method of  claim 34 , wherein the first configuration of CSI-IM resources includes at least one of: a first resourceConfig or a first subframeConfig, and the second configuration of CSI-IM resources includes at least one of: a second resourceConfig or a second subframeConfig. 
     
     
         41 . The method of  claim 34 , further comprising:
 determining from a downlink control information (DCI) assignment one or more physical downlink shared channel (PDSCH) resource elements not used for PDSCH transmission.