Methods and arrangements for performing cell measurements in a cellular communication system having multiple antenna ports

A method in a network node of a cellular communication system for receiving cell measurement results, the method comprising:

• receiving a measurement report message from a user equipment, UE, wherein the measurement report message comprises:
• a cell measurement result based on a performed cell measurement on one or more transmit antenna ports at a neighboring cell;
• and
• information indicating a number of transmit antenna ports at the neighboring cell on which the cell measurement was performed;
• interpreting said cell measurement result and said information indicating the number of transmit antenna ports on which the cell measurement was performed;
• and
• determining an accuracy of said cell measurement result based on the number of transmit antenna ports on which the cell measurement was performed.

An arrangement in a user equipment, UE, configured to be used in a cellular communication system for reporting cell measurement results from the UE via a radio interface between the UE and a network node in a cell serving the UE, the arrangement comprising:

• a unit for detecting one or more transmit antenna ports at a neighboring cell;
• a unit for performing a cell measurement on at least one detected transmit antenna port at the neighboring cell;
• a unit for generating a measurement report message, the measurement report message comprising:
• a cell measurement result based on the performed cell measurement;
• and
• information indicating a number of transmit antenna ports at the neighboring cell on which the cell measurement was performed;
• and
• a transmitter for sending the measurement report message to said network node;
• wherein the information indicating the number of transmit antenna ports at the neighboring cell on which the cell measurement was performed enables the network node to determine an accuracy of the measurement report.

An arrangement in a network node of a cellular communication system for receiving cell measurement results, the arrangement comprising:

• a receiver for receiving a measurement report message from a user equipment, UE, wherein the measurement report message comprises:
• a cell measurement result based on a performed cell measurement on one or more transmit antenna ports at a neighboring cell;
• and
• information indicating a number of transmit antenna ports at the neighboring cell on which the cell measurement was performed;
• a unit for interpreting said cell measurement result and said information indicating the number of transmit antenna ports at the neighboring cell on which the cell measurement was performed;
• and
• a unit for determining an accuracy of said cell measurement result based on the number of transmit antenna ports at the neighboring cell on which the cell measurement was performed.