Method and arrangement in a wireless communications system

A method in a second node for assisting a first node in the adaptation of a signal to be sent over a radio link from the first node to the second node in a wireless communication system, said method comprising:

• receiving, from the first node, a configuration request to restrict a selection of information alternatives by the second node to at least one subset of a set of possible information alternatives, wherein each subset comprises at least a part of a codebook;
• and
• sending a selected information alternative to the first node using a specific signaling format suitable for sending another information alternative selected from at least one other subset different than the at least one subset.

A first node in a wireless communication system that is configured to communicate over a radio link with a second node in the wireless communication system, said first node comprising:

• a transmitter configured to send a configuration request to the second node to restrict a selection of information alternatives by the second node to at least one subset of a set of possible information alternatives, each subset comprising at least a part of a codebook;
• and
• a receiver configured to receive an information alternative from the second node wherein the information alternative has a specific signaling format suitable for communicating another information alternative selected from at least one other subset different than the at least one subset.

A second node in a wireless communication system, the second node configured to communicate with a first node in the wireless communication system over a radio link, said second node comprising:

• a receiver configured to receive, from the first node, a configuration request to restrict a selection of information alternatives to at least one subset of a set of possible information alternatives, each subset comprising at least a part of a codebook;
• and
• a transmitter configured to send a selected information alternative to the first node using a particular signalling format, wherein the signalling format is reusable for signalling at least one other information alternative from at least one other subset.