Methods, systems and apparatuses for network assisted interference cancellation and suppression in long-term evolution (lte) systems

Abstract

A method implemented by a Wireless Transmit/Receive Unit (WTRU) includes receiving a DeModulation Interference Measurement (DM-IM) resource, determining an interference measurement based on the DM-IM resource, and demodulating a received signal based on the interference measurement. An interference is suppressed based on the interference measurement. At least one DM-IM resource is located in a Physical Resource Block (PRB). The DM-IM resource is located in a PRB allocated for the WTRU. The DM-IM resource is a plurality of DM-IM resources which form a DM-IM pattern, and the DM-IM pattern is located on a Physical Downlink Shared Channel (PDSCH) and/or an enhanced Physical Downlink Shared Channel (E-PDSCH) of at least one Long Term Evolution (LTE) subframe. The DM-IM resources are different for different Physical Resource Blocks (PRB) in the LTE subframe. The DM-IM is located in a Long Term Evolution (LTE) Resource Block (RB), and the DM-IM pattern is adjusted.

What is claimed is: 
     
         1 . A method implemented by a Wireless Transmit/Receive Unit (WTRU), the method comprising:
 receiving a DeModulation Interference Measurement (DM-IM) resource;   determining an interference measurement based on the DM-IM resource; and   demodulating a received signal based on the interference measurement.   
     
     
         2 . The method of  claim 1  further comprising suppressing an interference based on the interference measurement. 
     
     
         3 . The method of  claim 1  wherein at least one DM-IM resource is located in a Physical Resource Block (PRB). 
     
     
         4 . The method of  claim 3  wherein the at least one DM-IM resource is located in a PRB allocated for the WTRU. 
     
     
         5 . The method of  claim 1  wherein:
 the DM-IM resource is a plurality of DM-IM resources; 
 the plurality of DM-IM resources form a DM-IM pattern; and 
 the DM-IM pattern is located on at least one of a Physical Downlink Shared Channel (PDSCH) and/or an enhanced Physical Downlink Shared Channel (E-PDSCH) of at least one Long Term Evolution (LTE) subframe. 
 
     
     
         6 . The method of  claim 5  wherein the DM-IM resources are different for different Physical Resource Blocks (PRB) in the LTE subframe. 
     
     
         7 . The method of  claim 1  wherein the DM-IM is located in a Long Term Evolution (LTE) Resource Block (RB), further comprising:
 adjusting a DM-IM pattern based on at least one of:
 a frame number associated with the LTE RB; 
 a subframe number associated with the LTE RB; and/or 
 an RB index associated with the LTE RB. 
 
 
     
     
         8 . The method of  claim 1  further comprising:
 receiving a plurality of DM-IM resources; and 
 adjusting the DM-IM resources in respective LTE subframes based on a higher layer signaling. 
 
     
     
         9 . The method of  claim 1  further comprising:
 locating a DM-IM resource associated with the WTRU based on a cell specific identifier associated with a cell serving the WTRU. 
 
     
     
         10 . A Wireless Transmit/Receive Unit (WTRU), comprising:
 a receiver configured to receive a DeModulation Interference Measurement (DM-IM) resource; and   a processor configured to:
 determine an interference measurement based on the DM-IM resource; and 
 demodulate a received signal based on the interference measurement. 
   
     
     
         11 . The WTRU of  claim 10  wherein the processor is father configured to suppress an interference based on the interference measurement. 
     
     
         12 . The WTRU of  claim 10  wherein at least one DM-IM resource is located in a Physical Resource Block (PRB). 
     
     
         13 . The WTRU of  claim 12  wherein the at least one DM-IM resource is located in a PRB allocated for the WTRU. 
     
     
         14 . The WTRU of  claim 10  wherein:
 the DM-IM resource is a plurality of DM-IM resources; 
 the plurality of DM-IM resources form a DM-IM pattern; and 
 the DM-IM pattern is located on at least one of a Physical Downlink Shared Channel (PDSCH) and/or an enhanced Physical Downlink Shared Channel (E-PDSCH) of at least one Long Term Evolution (LTE) subframe. 
 
     
     
         15 . The WTRU of  claim 14  wherein the DM-IM resources are different for different Physical Resource Blocks (PRB) in the LTE subframe. 
     
     
         16 . The WTRU of  claim 10  wherein the DM-IM is located in a Long Term Evolution (LTE) Resource Block (RB) and the processor is father configured to:
 adjust a DM-IM pattern in a LTE Resource Block (RB) based on at least one of:
 a frame number associated with the LTE RB; 
 a subframe number associated with the LTE RB; and/or 
 an RB index associated with the LTE RB. 
 
 
     
     
         17 . The WTRU of  claim 10  wherein the processor is father configured to:
 receive a plurality of DM-IM resources; and 
 adjust a number of DM-IM resources in a respective LTE subframe based on a higher layer signaling. 
 
     
     
         18 . The WTRU of  claim 10  wherein the processor is father configured to:
 locate a DM-IM resource associated with the WTRU based on a cell specific identifier associated with a cell serving the WTRU. 
 
     
     
         19 . A method implemented by a Wireless Transmit/Receive Unit (WTRU), comprising:
 receiving a Downlink (DL) information; and   determining, from the DL information, whether a co-scheduling indicator indicates that a further WTRU or transmitter is co-scheduled with the WTRU.   
     
     
         20 . The method of  claim 19  further comprising selectively suppressing an Interfering Signal (IS) of the further WTRU or transmitter based on the co-scheduling indicator.