Backward Compatibility of PUCCH Formats

An apparatus comprising:

• at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• obtain signaling configuration of a first signaling format, wherein the first signaling format is an extended payload format and the second signaling format is a legacy format, and a bandwidth of the extended payload format is larger than that of the legacy format, and the first signaling format and the second signaling format utilize at least partly same frequency and code domain resources, and
• configure a signaling transmission according to the signaling configuration of the first signaling format.

(canceled)

A method comprising:

• configuring data symbols for being conveyed by using a first signaling format and a second signaling format, and
• configuring reference signal symbols for being conveyed by using the first signaling format and the second signaling format for obtaining payload extension for uplink control information on a physical uplink control channel, wherein the first signaling format is an extended payload format and the second signaling format is a legacy format, and a bandwidth of the extended payload format is larger than that of the legacy format, and the first signaling format and the second signaling format utilize at least partly same frequency and code domain resources.

A method comprising:

• obtaining signaling configuration of a first signaling format, wherein the first signaling format is an extended payload format and the second signaling format is a legacy format, and a bandwidth of the extended payload format is larger than that of the legacy format, and the first signaling format and the second signaling format utilize at least partly same frequency and code domain resources, and
• configuring a signaling transmission according to the signaling configuration of the first signaling format.

-34. (canceled)