IAB Radio Link Failure Messaging for Accurate Parent Node Reselection

The radio link recovery failure message is segmented into distinct functional components: a message type indicator field that identifies the message purpose, and optional identification information fields (such as BAP address identifier or cell identifier) that provide context about the failure origin. This segmentation allows the message structure to be both simple (when only the indicator is present) and informative (when additional identification data is included), enabling child IAB nodes to make appropriate parent node selection decisions without unnecessary service interruption.

The message structure applies local quality by making the identification information optional rather than mandatory. The message type indicator is always present to provide basic message identification, while detailed identification information (BAP address identifier, cell identifier) is included only when needed for accurate parent node selection. This allows the message to be simple in cases where basic notification suffices, and more detailed only when precision is required, thus balancing complexity and accuracy.