Configuration of Coordinated Multipoint Transmission Hypotheses for Channel State Information Reporting

A method for improving link adaptation in a wireless communications system, the method performed at a User Equipment, UE, and comprising:

• receiving a configuration message from an eNodeB, wherein the configuration message specifies at least one Channel State Information, CSI, report specifying an interference hypothesis and a desired signal hypothesis corresponding to a hypothetical data transmission over an effective channel that is characterized by a reference signal;
• estimating interference according to the specified interference hypothesis, and estimating properties of the effective channel;
• determining at least one CSI report based on the interference estimation and the estimated properties of the effective channel;
• and
• transmitting the at least one CSI report to the eNodeB.

A User Equipment, UE, configured for improving link adaptation in a wireless communications system, the UE comprising:

• a communications interface configured to receive a configuration message from an eNodeB, wherein the configuration message specifies at least one first Channel State Information, CSI, report specifying an interference hypothesis and a desired signal hypothesis corresponding to a hypothetical data transmission over an effective channel that is characterized by a reference signal;
• and
• a controller configured to:
• estimate interference according to the specified interference hypothesis and estimate the properties of the effective channel
• determine at least one CSI report based on the interference estimation and the estimated properties of the effective channel;
• and
• send the at least one CSI report to the eNodeB.

A method for improving link adaptation in a wireless communications system, the method performed at an eNodeB and comprising:

• transmitting a configuration message to a UE, the configuration message specifying at least one Channel State Information, CSI, report specifying an interference hypothesis and a desired signal hypothesis corresponding to a hypothetical data transmission over an effective channel that is characterized by a reference signal, to configure the UE to:
• estimate interference according to the specified interference hypothesis;
• estimate properties of the effective channel;
• and
• determine the at least one CSI report based on the interference estimation and the estimated properties of the effective channel;
• and
• receiving, from the UE, the at least one CSI report.

An eNodeB configured link adaptation in a wireless communications system, the eNodeB comprising:

• a communications interface;
• and
• a controller operatively connected to the communications interface and configured to, via the communications interface:
• transmit a configuration message to a UE, the configuration message specifying at least one Channel State Information, CSI, report specifying an interference hypothesis and a desired signal hypothesis corresponding to a hypothetical data transmission over an effective channel characterized by a reference signal, to configure the UE to:
• estimate interference according to the specified interference hypothesis;
• estimate properties of the effective channel;
• and
• determine the at least one CSI report based on the interference estimation and the estimated properties of the effective channel;
• and
• receive, from the UE, the at least one CSI report.