According to the exemplary embodiments of the invention, there is a method, apparatus and computer program for composing at least one system information message instance for a first particular radio access technology system, and for transmitting the at least one message instance to at least one network node. In addition, the exemplary embodiments of the invention provide for receiving, decoding, and processing the received at least one message instance. Further, according to the exemplary embodiments each one of the at least one message instance includes a start field to indicate whether the message instance is a first instance of the at least one message instance, and a stop field to indicate whether the message instance is a last instance of the at least one message instance.