Patent ID: 8743732

Claim:
An updating method for an Iu interface supported parallel Multimedia Broadcast Multicast Service (MBMS) session, comprising: a Radio Network Controller (RNC), after receiving a MBMS session updating message from a Serving General Packet Radio Service Support Node (SGSN), detecting whether a modified MBMS Service area (MBMS SA) of the MBMS service session overlaps with MBMS SAs of other sessions of the same MBMS service, and performing an updating operation for the MBMS service session according to the detecting result, wherein the modified MBMS SA is carried in the MBMS service session updating message, further wherein the step of detecting whether the modified MBMS SA overlaps with the MBMS SAs of the other sessions of the same MBMS service is completed by the following processes: determining whether there is another established session of the same MBMS service existing on the RNC; and determining whether an MBMS SA corresponding to said another established session has at least one cell shared with the modified MBMS SA if said another established session exists.