Method and apparatus for indicating downlink channel measurement and method and apparatus performing downlink channel measurement in a relaying system

An apparatus for indicating downlink channel measurement in a relaying system, the apparatus comprising:

• a receiver configured to receive, from a user equipment, information on interferers;
• a transmitter configured to transmit, to the user equipment, at least one downlink channel measurement indication instructing the user equipment to perform a downlink channel measurement corresponding the at least one downlink channel measurement indication;
• and
• a memory storing instructions and at least one processor configured to execute the instructions and thereby implement:
• a measurement indication generation unit, for generating, based on downlink subframe configuration information, at least one downlink channel measurement indication, corresponding to possible combinations of the interferers, configured to indicate a subframe group to be measured by the user equipment,
• wherein the at least one processor further implements an interferer combination formation unit, for forming the possible combinations of the interferers received from the user equipment,
• wherein the downlink subframe configuration information is represented by bitmaps, and
• wherein the at least one processor further implements the measurement indication generation unit for generating the downlink channel measurement indication by performing, based on a type of the user equipment and properties of the interferers, a logic operation on the bitmaps representing corresponding downlink subframe configuration information.

A method of a user equipment performing downlink channel measurement in a relaying system, comprising:

• reporting, to a serving node of the user equipment, information on interferers of the user equipment;
• receiving, from the serving node, at least one downlink channel measurement indication, corresponding to possible combinations of the interferers, configured to indicate a subframe group to be measured by the user equipment;
• performing at least one downlink channel measurement for the subframe group based on the at least one downlink channel measurement indication;
• and
• forming the possible combinations of the interferers and sending the possible combinations of the interferers to the serving node;
• receiving downlink subframe configuration information,
• wherein the downlink subframe configuration information is represented by bitmaps, and
• wherein the downlink channel measurement indication is generated by performing, based on a type of the serving node and properties of the interferers, a logic operation on the bitmaps representing corresponding downlink subframe configuration information.

An apparatus for performing downlink channel measurement in a relaying system, the apparatus comprising:

• a transmitter configured to transmit, to a serving node of the apparatus, information on interferers of the apparatus;
• a receiver configured to receive, from the serving node, at least one downlink channel measurement indication, corresponding to possible combinations of the interferers, configured to instruct the apparatus to perform a downlink channel measurement corresponding to the at least one downlink channel measurement indication;
• and
• a memory storing instructions and at least one processor configured to execute the instructions and thereby implement:
• a channel measurement unit, for performing the downlink channel measurement for the subframe group based on the at least one downlink channel measurement indication;
• and
• forming the possible combinations of the interferers and sending the possible combinations of the interferers to the serving node;
• receiving downlink subframe configuration information,
• wherein the downlink subframe configuration information is represented by bitmaps, and
• wherein the downlink channel measurement indication is generated by performing, based on a type of the serving node and properties of the interferers, a logic operation on the bitmaps representing corresponding downlink subframe configuration information.