Devices and methods related to improvements in coordinated multipoint transmission arrangements

Abstract

The present invention proposes methods and devices related to improvements in coordinated multipoint transmission arrangements, and in this regard proposes a device, including a controller module, configured 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, wherein each subset with resources allocated thereto defines a respective coordinated transmission scheme, wherein the controller module is configured to transmit information on resources pertaining to multiple coordinated transmission schemes, and send at least one biasing parameter associated to at least one of the transmission schemes, to be applied for biasing a channel quality parameter. Another device includes a controller module, configured to report feedback responsive to such coordinated transmission, and the controller module is, among others, configured to apply the at least one biasing parameter to derived channel quality parameters.

1 . A device, comprising:
 circuitry configured to
 receive information indicating resource sets corresponding to each of a plurality of coordinated multipoint transmission schemes; 
 receive at least one biasing parameter corresponding to at least one of the coordinated multipoint transmission schemes; 
 measure channels corresponding to each resource set; 
 derive a channel quality parameter for each of the plurality of coordinated multipoint transmission schemes based on the measured channels; and 
 apply the at least one biasing parameter to at least one of the channel quality parameters. 
   
     
     
         2 . The device of  claim 1 , wherein
 the circuitry is configured to measure interference outside each of the plurality of coordinated multipoint transmission schemes.   
     
     
         3 . The device of  claim 2 , wherein
 the circuitry is configured to derive the channel quality parameter for each of the plurality of coordinated multipoint transmission schemes based on the measured channels and the measured interference.   
     
     
         4 . The device of  claim 1 , wherein
 the circuitry is configured to select one of the channel quality parameters to which a biasing parameter is applied as a biased channel quality parameter to be reported to another device.   
     
     
         5 . The device according to  claim 4 , wherein
 the circuitry is configured to transmit the selected biased channel quality parameter to the another device together with information identifying which of the plurality of coordinated multipoint transmission schemes to which the biased channel quality parameter corresponds.   
     
     
         6 . The device according to  claim 1 , wherein
 the circuitry is configured to receive, as the at least one biasing parameter, a difference by which a channel quality parameter associated with one of the coordinated multipoint transmission schemes differs from other channel quality parameters associated with at least one other coordinated multipoint transmission scheme.   
     
     
         7 . The device according to  claim 1 , wherein
 the circuitry is configured to receive, as the at least one biasing parameter, a weighting parameter by which a channel quality parameter associated with at least one of the coordinated multipoint transmission schemes is weighted.   
     
     
         8 . The device according to  claim 7 , wherein
 the circuitry is configured to receive a plurality of weighting parameters, each of the plurality of weighting parameters being associated with at least one coordinated multipoint transmission scheme.   
     
     
         9 . The device of  claim 1 , wherein
 the derived channel quality parameter is a channel quality indicator (CQI), and   the circuitry is configured to transmit, to another device, a CQI corresponding to at least one of the plurality of coordinated multipoint transmission schemes after applying the at least one biasing parameter.   
     
     
         10 . The device of  claim 1 , wherein
 the circuitry is configured to identify one of the plurality of coordinated multipoint transmission schemes having a highest channel quality parameter from among the plurality of coordinated multipoint transmission schemes after applying the at least one biasing parameter.   
     
     
         11 . The device of  claim 10 , wherein
 the circuitry is configured to transmit, to another device, the channel quality parameter corresponding to the one of the plurality of coordinate multipoint transmission schemes.   
     
     
         12 . The device of  claim 1 , wherein
 the received at least one biasing parameter indicates a difference between a channel quality indicator (CQI) parameter for a joint transmission coordinated multipoint transmission scheme and a CQI for a non-joint transmission coordinated multipoint transmission scheme.   
     
     
         13 . The device of  claim 1 , wherein
 the received at least one biasing parameter indicates transmission power applied to a respective coordinated multipoint transmission scheme.   
     
     
         14 . The device of  claim 13 , wherein
 the circuitry is configured to weight a signal to interference plus noise (SINR) measurement by the device for the respective coordinated multipoint transmission scheme.   
     
     
         15 . A method performed by a mobile device, the method comprising:
 receiving, at a communication interface of the mobile device, information indicating resource sets corresponding to each of a plurality of coordinated multipoint transmission schemes;   receiving, at the communication interface, at least one biasing parameter corresponding to at least one of the coordinated multipoint transmission schemes;   measuring, by circuitry of the mobile device, channels corresponding to each resource set;   measuring, by the circuitry, interference outside each of the coordinated multipoint transmission schemes;   deriving, by the circuitry, a channel quality indicator (CQI) corresponding to each of the plurality coordinated multipoint transmission schemes based on the measured channels and the measured interference; and   applying, by the circuitry, the at least one biasing parameter to at least one of the CQIs.   
     
     
         16 . The method of  claim 15 , further comprising:
 transmitting, by the communication interface to a base station, at least one of the CQIs after applying the at least one biasing parameter.   
     
     
         17 . The method of  claim 15 , further comprising:
 identifying, by the circuitry, a highest CQI of the CQIs corresponding to each of the plurality coordinated multipoint transmission schemes after applying the at least one biasing parameter; and   transmitting, by the communication interface to a base station, the highest CQI together with information identifying the coordinated multipoint transmission scheme to which the highest CQI corresponds.   
     
     
         18 . A user equipment comprising:
 a communication interface configured to
 receive information indicating resource sets corresponding to each of a plurality of coordinated multipoint transmission schemes; 
 receive at least one biasing parameter corresponding to at least one of the coordinated multipoint transmission schemes; and 
   circuitry configured to
 measure channels corresponding to each resource set; 
 measure interference outside each of the coordinated multipoint transmission schemes; 
 identify a channel quality indicator (CQI) corresponding to each of the plurality coordinated multipoint transmission schemes based on the measured channels and the measured interference; and 
 apply the at least one biasing parameter to at least one of the CQIs. 
   
     
     
         19 . The user equipment of  claim 18 , wherein the communication interface is configured to transmit at least one of the CQIs after applying the at least one biasing parameter to a base station. 
     
     
         20 . The method of  claim 15 , wherein
 the circuitry is configured to identify a best CQI of the CQIs corresponding to each of the plurality coordinated multipoint transmission schemes after applying the at least one biasing parameter; and   the communication interface is configured to transmit, to a base station, the highest CQI together with information identifying the coordinated multipoint transmission scheme to which the highest CQI corresponds.