SYNCHRONIZATION PROCESSING METHOD FOR MULTIMEDIA BROADCAST MULTICAST SERVICE, UPPER LAYER NETWORK ELEMENT, AND LOWER LAYER NETWORK ELEMENT THEREOF

摘要

The present invention provides a synchronization processing method for multimedia broadcast multicast service (MBMS), an upper layer network element, and a lower layer network element thereof. The method includes: an upper layer network element sends a synchronization protocol control frame to a lower layer network element, wherein, the synchronization protocol control frame carries the data packet length information of the pre-determined data frame in the synchronization sequence corresponding to the synchronization protocol control frame, and the pre-determined data frame includes at least one of: each data frame, part of a data frame. The present invention resolves the problem that the lower layer network element can not keep the synchronization with other lower layer network elements which receive the data packet successfully due to that each lost data packet length can not be obtained in the condition that multiple data packets are lost successively, and can avoid that the lower layer network element loses synchronization for a long time in the condition that service data packets are lost, thus improving the Robustness and efficiency for the MBMS service synchronization.