A method of sending a notification about mobile broadcast, BCAST, services in a BCAST system, where contents of the BCAST services are received from a content creation, CC, entity and the BCAST services are provided to one terminal (1108; 1204; 1304) or a group of terminals through a broadcast distribution system, BDS (1106; 1203), or an interaction network (1107; 1303), comprising the steps of: receiving a notice of a notification event (1211, 1212, 1213, 1214; 1311, 1312, 1314) related to a BCAST service or a service guide, SG, in a BCAST subscription management, SM, entity (1104; 1201; 1301) adapted to manage subscription information; generating (1215; 1315) a notification message (1216; 1316) about the notification event in the BCAST SM entity (1104; 1201; 1301); sending the notification message from the BCAST SM entity (1104; 1201; 1301) to a BCAST Service distribution/adaptation, SD/A, entity (1103; 1202; 1302) for aggregating and delivering BCAST service data and generating an SG about the BCAST services; determining (1217; 1317) a transmission channel for the notification message, among a broadcast channel (1125; 1218; 1219) of the BDS (1106; 1203) and an interaction channel (1126; 1318; 1319) of the interaction network (1107; 1303), in the BCAST SD/A entity (1104; 1201; 1301); and sending the notification message from the BCAST SD/A entity (1104; 1201; 1301) to the terminal (1108; 1204; 1304) or the group of terminals on the broadcast channel (1125; 1218; 1219) of the BDS (1106; 1203) or on the interaction channel (1126; 1318; 1319) of the interaction network (1107; 1303) according to the determination (1217; 1317) wherein the notification message (1216; 1316) includes a service identifier, ID, indicating a BCAST service related with the notification message, a reason for sending the notification message, and a version number of the SG or wherein the notification message (1216; 1316) includes a SG ID indicating the SG related with the notification message, a reason for sending the notification message, and a version number of the SG. receiving a notice of a notification event (1211, 1212, 1213, 1214; 1311, 1312, 1314) related to a BCAST service or a service guide, SG, in a BCAST subscription management, SM, entity (1104; 1201; 1301) adapted to manage subscription information; generating (1215; 1315) a notification message (1216; 1316) about the notification event in the BCAST SM entity (1104; 1201; 1301); sending the notification message from the BCAST SM entity (1104; 1201; 1301) to a BCAST Service distribution/adaptation, SD/A, entity (1103; 1202; 1302) for aggregating and delivering BCAST service data and generating an SG about the BCAST services; determining (1217; 1317) a transmission channel for the notification message, among a broadcast channel (1125; 1218; 1219) of the BDS (1106; 1203) and an interaction channel (1126; 1318; 1319) of the interaction network (1107; 1303), in the BCAST SD/A entity (1104; 1201; 1301); and sending the notification message from the BCAST SD/A entity (1104; 1201; 1301) to the terminal (1108; 1204; 1304) or the group of terminals on the broadcast channel (1125; 1218; 1219) of the BDS (1106; 1203) or on the interaction channel (1126; 1318; 1319) of the interaction network (1107; 1303) according to the determination (1217; 1317)