A target radio access network, RAN, node used in a second radio communication system, whereby the target RAN node supports on-demand system information transmission, the target RAN node comprising: a memory; and at least one processor coupled to the memory and configured to: receive a HANDOVER REQUEST message from a source RAN node used in a first radio communication system, whereby the source RAN node does not support on-demand system information transmission; and send, to the source RAN node, a HANDOVER REQUEST ACKNOWLEDGE message, wherein the HANDOVER REQUEST ACKNOWLEDGE message comprises: an indication list that indicates System Information Block, SIB, types of on-demand system information which are available in a cell served by the target RAN node, whereby the indication list is for on-demand system information that is not being transmitted as system information, and scheduling information for the on-demand system information that is being transmitted as system information, the HANDOVER REQUEST ACKNOWLEDGE message causes the source RAN node to transmit the indication list and the scheduling information to a radio terminal in a cell of the source RAN node, whereby the on-demand system information, which is available in a cell served by the target RAN node but is not being broadcasted, is to be transmitted in a cell of the target RAN node in response to a request from the radio terminal. a memory; and at least one processor coupled to the memory and configured to: receive a HANDOVER REQUEST message from a source RAN node used in a first radio communication system, whereby the source RAN node does not support on-demand system information transmission; and send, to the source RAN node, a HANDOVER REQUEST ACKNOWLEDGE message, wherein receive a HANDOVER REQUEST message from a source RAN node used in a first radio communication system, whereby the source RAN node does not support on-demand system information transmission; and send, to the source RAN node, a HANDOVER REQUEST ACKNOWLEDGE message, wherein the HANDOVER REQUEST ACKNOWLEDGE message comprises: an indication list that indicates System Information Block, SIB, types of on-demand system information which are available in a cell served by the target RAN node, whereby the indication list is for on-demand system information that is not being transmitted as system information, and scheduling information for the on-demand system information that is being transmitted as system information, an indication list that indicates System Information Block, SIB, types of on-demand system information which are available in a cell served by the target RAN node, whereby the indication list is for on-demand system information that is not being transmitted as system information, and scheduling information for the on-demand system information that is being transmitted as system information, the HANDOVER REQUEST ACKNOWLEDGE message causes the source RAN node to transmit the indication list and the scheduling information to a radio terminal in a cell of the source RAN node, whereby the on-demand system information, which is available in a cell served by the target RAN node but is not being broadcasted, is to be transmitted in a cell of the target RAN node in response to a request from the radio terminal.