Coordinated interference mitigation and cancelation

Abstract

A method includes receiving at user equipment an indication of a subset of scheduling constraints for interference mitigation and cancelation and performing interference mitigation and cancelation utilizing the subset of scheduling constraints.

The invention claimed is: 
     
       1. A device comprising:
 a transceiver; 
 a processor; and 
 a memory having instructions for execution by the processor to:
 receive an indication of a subset of scheduling constraints for interference mitigation and cancelation, the indication being common to at least one other user equipment receiver and in the form of a downlink control indicator (DCI) with an index that corresponds to the subset of scheduling constraints in a locally stored table with multiple indexed sets of subsets of scheduling constraints corresponding to modulation/transmission mode/modulation coding scheme/precoding matrix indicator; 
 use the index to retrieve the subset of scheduling constraints from the table; and 
 perform interference mitigation and cancelation utilizing the subset of scheduling constraints by searching for use of the subset of scheduling constraints by others and mitigating the effect of used scheduling constraints in the subset of constraints. 
 
 
     
     
       2. The device of  claim 1  wherein the subset of modulation coding scheme/resource combinations comprise at least two modulation coding scheme/resources selected from the group consisting of MCS (modulation coding scheme), precoding (PMI—precoding matrix indicator) and frequency-time resources. 
     
     
       3. The device of  claim 1  wherein the scheduling constraints specify that co-scheduled user equipment radio bands are totally overlapping. 
     
     
       4. The device of  claim 3  wherein the scheduling constraints specify that co-scheduled user equipment radio bands are permitted to start from a mid-point of a radio band allocation and that the radio bands are continuous. 
     
     
       5. The device of  claim 1  wherein the scheduling constraints specify that modulation orders of co-scheduled user equipment are within a limited range. 
     
     
       6. The device of  claim 1  wherein the scheduling constraints specify that transmission modes are within a limited number of combinations. 
     
     
       7. The device of  claim 1  wherein the scheduling constraints specify that a number of co-scheduled user equipment is limited. 
     
     
       8. A method comprising:
 receiving, at a user equipment, an indication of a subset of scheduling constraints for interference mitigation and cancelation, the indication being common to at least one other user equipment receiver and in the form of a downlink control indicator (DCI) with an index that corresponds to the subset of scheduling constraints in a locally stored table with multiple indexed sets of subsets of scheduling constraints corresponding to modulation/transmission mode/modulation coding scheme/precoding matrix indicator; 
 using the index to retrieve the subset of scheduling constraints from the table; and 
 performing interference mitigation and cancelation utilizing the subset of scheduling constraints by searching for use of the subset of scheduling constraints by others and mitigating the effect of used scheduling constraints in the subset of constraints. 
 
     
     
       9. The method of  claim 8  wherein the subset of modulation coding scheme/resource combinations comprise at least two modulation coding scheme/resources selected from the group consisting of MCS (modulation coding scheme), precoding (PMI—precoding matrix indicator) and frequency-time resources. 
     
     
       10. The method of  claim 8  wherein the scheduling constraints for interference mitigation and cancelation are received by the user equipment in an interference-cooperation region between neighboring cells. 
     
     
       11. The method of  claim 8  and further comprising:
 exchanging information identifying an interference-cooperation region between neighboring cells; and 
 synchronizing scheduling constraints to propagate to user equipment in the interference-cooperation region. 
 
     
     
       12. The method of  claim 11  wherein one scheduling constraint includes a radio band allocation starting from a specified set of radio bands. 
     
     
       13. The method of  claim 11  wherein one scheduling constraint includes all user equipment within the interference-cooperation region using phase-shift keying. 
     
     
       14. A base station comprising:
 a transceiver; 
 a processor; and 
 a memory having instructions for execution by the processor to:
 identify a subset of scheduling constraints for interference mitigation and cancelation, the subset of scheduling constraints reducing the search space for a user equipment searching of uses of scheduling constraints to countermand interference resulting from the uses; and 
 send an indication of the subset of scheduling constraints to multiple user equipments within a cell of the base station to enable the user equipment to perform interference mitigation and cancelation utilizing the subset of scheduling constraints, the indication in the form of a downlink control indicator (DCI) with an index that corresponds to the subset of scheduling constraints in a table stored on the multiple user equipments, the table including multiple indexed sets of subsets of scheduling constraints corresponding to modulation/transmission mode/modulation coding scheme/precoding matrix indicator. 
 
 
     
     
       15. The base station of  claim 14  and wherein the processor further:
 exchanges information identifying an interference-cooperation region between neighboring cells; and 
 synchronizes scheduling constraints to propagate to user equipment in the interference-cooperation region. 
 
     
     
       16. The base station of  claim 14  wherein one subset of scheduling constraint includes a radio band allocation starting from a specified set of radio bands and that all user equipment within the interference-cooperation region use phase-shift keying.