Methods and Devices for Reporting a Downlink Channel Quality

A method, in a user equipment, for reporting a downlink channel quality in a communication system, the communication system comprising a first radio access technology system and a second radio access technology system, the user equipment being in connection both with a primary serving cell of the first radio access technology system and with a secondary serving cell of the second radio access technology system, the method comprising:

• determining channel quality for the second radio access technology system using an indicator format of the radio access technology of the second radio access technology system;
• mapping an indicator of the channel quality having the indicator format of the second radio access technology to an indicator format used for channel quality indicators in the first radio access technology system;
• transmitting, on an uplink carrier of the first radio access technology system, the indicator of the channel quality for the second radio access technology system to the communication system using the indicator format of the first radio access technology.

A method, in a network node of a communication system, the communication system comprising a first radio access technology system, a second radio access technology system, and a user equipment in connection with both a primary serving cell of the first radio access technology system and with a secondary serving cell of the second radio access technology system, the method comprising:

• receiving a report of channel quality from the user equipment, the report including an indicator of the channel quality having an indicator format of the second radio access technology mapped to an indicator format used for channel quality indicators in the first radio access technology system;
• determining whether the report of channel quality relates to the first radio access technology system or to the second radio access technology system.

A network node of a communication system, the communication system comprising a first radio access technology system, a second radio access technology system, and user equipment in connection with both a primary serving cell of the first radio access technology system and with a secondary serving cell of the second radio access technology system, the network node comprising:

• a receiver configured to receive a report of channel quality from the user equipment, the report including an indicator of the channel quality having the indicator format of the second radio access technology mapped to an indicator format used for channel quality indicators in the first radio access technology system;
• one or more processing circuits configure to determine whether the report of channel quality relates to the first radio access technology system or to the second radio access technology system.