Devices and methods related to controlling ue assumption of interface

Abstract

To control UE assumption of interference there is a controller module to control a plurality of transmission points, each constituted by a set of at least one transmit antenna, to transmit data to another device in a coordinated transmission from at least a subset of the plurality of transmission points. The controller module is configured to allocate, to each resource linked to the subset of the plurality of transmission points, an interference contribution parameter that is indicative of an expected interference contribution originating from said transmission point, and to inform said another device of those resources to which the subset of the plurality of transmission points is linked, together with the respective interference contribution parameter allocated to each resource. Another device reports feedback based on signals which are scaled with the respective interference contribution parameter.

1 . An electronic device comprising:
 circuitry configured to
 receive coordinated transmission from at least a subset of a plurality of transmission points, each transmission point comprising at least one transmit antenna; 
 receive, for each resource to which the subset of the plurality of transmission points is linked, an interference contribution parameter allocated to each resource and indicative of an expected interference contribution of the transmission point; and 
 select a reporting signal to be transmitted to the another device based on the coordinated transmission and the interference contribution parameter. 
   
     
     
         2 . The electronic device of  claim 1 , wherein
 the circuitry is configured to measure a channel transfer function for each channel corresponding to a resource to which the subset of the plurality of transmission points designated for coordinated transmission is linked.   
     
     
         3 . The electronic device of  claim 1 , wherein
 the circuitry is configured to measure interference originating from resources not linked to the subset of the plurality of transmission points.   
     
     
         4 . The electronic device of  claim 3 , wherein
 the circuity is configured to obtain a first feedback signal indicative of a first channel quality for each resource linked to the subset of the plurality of transmission points and transmitting a payload signal.   
     
     
         5 . The electronic device of  claim 4 , wherein
 the circuitry is configured to obtain a second feedback signal indicative of a second channel quality for each resource linked to the subset of the plurality of transmission points and transmitting an interfering signal.   
     
     
         6 . The electronic device of  claim 5 , wherein
 the circuitry is configured to sum the first and second feedback signals scaled with a respective interference contribution parameter allocated to a respective resource.   
     
     
         7 . The electronic device of  claim 6 , wherein
 the circuitry is configured to select the reporting signal based on the result of summing and the measured interference.   
     
     
         8 . The electronic device of  claim 1 , wherein
 the interference contribution parameters have a value greater than zero and are indicative for a transmission from the transmission point linked to the resources.   
     
     
         9 . The electronic device of  claim 8 , wherein
 a value of the interference contribution parameter greater than zero and smaller than “1” denotes a reduction in interference level, and   a value greater than “1” denotes an increased interference level.   
     
     
         10 . The electronic device of  claim 1 , wherein
 the interference contribution parameters have a value equal to zero and denote no transmission from the transmission point linked to the resources.   
     
     
         11 . The electronic device of  claim 2 , wherein
 the circuitry is configured to measure interference originating from resources not linked to said subset of the plurality of transmission points such that interference is measured directly only from those resources not linked to the subset of the plurality of transmission points.   
     
     
         12 . The electronic device of  claim 11 , wherein
 the resources not linked to the subset are selected for measurement based on their configuration to be assumed to be muted due to being attributed a transmission with zero power or a maximum interference reduction.   
     
     
         13 . The electronic device of  claim 2 , wherein
 the circuitry is configured to measure interference originating from resources not linked to the subset of the plurality of transmission points by measuring the overall interference and then subtracting the contribution of the resources linked to a part of the subset of the plurality of transmission points that are identified as being attributed to transmission with zero power or a maximum interference reduction.   
     
     
         14 . The electronic device of  claim 5 , wherein
 the circuitry is configured to select the reporting signal by calculating the reporting based on a ratio of:   a sum of the first and second feedback signals, and   the sum of the first and second feedback signals plus the measured interference.   
     
     
         15 . A mobile station configured to report feedback to a base station responsive to the base station's coordinated transmission from at least a subset of a plurality of transmission points, each transmission point being constituted by a set of at least one transmit antenna, the mobile station comprising:
 circuitry configured to
 receive, for each resource to which the subset of the plurality of transmission points designated for the base station's coordinated transmission is linked, a respective interference contribution parameter allocated to each resource and indicative of an expected interference contribution originating from the respective transmission point; 
 measure interference originating from at least a first resource not linked to the subset of the plurality of transmission points; 
 obtain a first feedback signal indicative of a first channel quality for each resource linked to the subset of the plurality of transmission points and transmitting a payload signal; 
 derive a second feedback signal indicative of a second channel quality for each resource linked to the subset of the plurality of transmission points and transmitting an interfering signal; 
 sum the first and second feedback signals scaled with the respective interference contribution parameter allocated to the respective resource, and the measured interference, and 
 select a reporting signal to be transmitted to the another device based on the result of summing. 
   
     
     
         16 . The mobile station of  claim 15 , wherein
 the respective interference contribution parameters have a value greater than zero and are indicative for a transmission from the transmission point linked to the resources.   
     
     
         17 . The mobile station of  claim 15 , wherein
 the circuitry is configured to measure interference originating from resources not linked to the subset of the plurality of transmission points such that interference is measured directly only from resources not linked to the subset of the plurality of transmission points.   
     
     
         18 . A method of reporting feedback to an apparatus responsive to a coordinated transmission from at least a subset of a plurality of transmission points, each transmission point being constituted by a set of at least one transmit antenna, the method comprising:
 receiving, for each resource to which the subset of the plurality of transmission points designated for the coordinated transmission is linked, a respective interference contribution parameter allocated to each resource and indicative of an expected interference contribution originating from the respective transmission point;   obtaining a first feedback signal indicative of a first channel quality for each resource linked to the subset of the plurality of transmission points and transmitting a payload signal;   obtaining a second feedback signal indicative of a second channel quality for each resource linked to the subset of the plurality of transmission points and transmitting an interfering signal; and   selecting a reporting signal to be transmitted based on the obtained first and second feedback signals.   
     
     
         19 . The method of  claim 18 , further comprising:
 measuring interference originating from at least a first resource not linked to the subset of the plurality of transmission points.   
     
     
         20 . The method of  claim 19 , wherein
 the selecting is based on the first and second obtained feedback signals and the measured interference.