US 7,349,359 B2
System and method for synchronizing broadcast/multicast service content frames in a mobile communication system
Yong Chang, Seongnam-si (Korea, Republic of); Jun-Hyuk Song, Anyang-si (Korea, Republic of); Nae-Hyun Lim, Seoul (Korea, Republic of); Dae-Gyun Kim, Seongnam-si (Korea, Republic of); Ji-Hae Yi, Suwon-si (Korea, Republic of); and Beom-Sik Bae, Suwon-si (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (Korea, Republic of)
Filed on Sep. 13, 2004, as Appl. No. 10/938,513.
Claims priority of application No. 10-2003-0063471 (KR), filed on Sep. 13, 2003.
Prior Publication US 2005/0058090 A1, Mar. 17, 2005
Int. Cl. H04L 12/56 (2006.01)
U.S. Cl. 370—312  [370/342; 370/389] 24 Claims
OG exemplary drawing
 
1. A method for transmitting a Broadcast/Multicast Service (BCMCS) content frame in a mobile communication system connected to a BCMCS server, the method comprising:
receiving, by a Packet Data Service Node (PDSN), a BCMCS content frame from the BCMCS server, and transmitting a corresponding Generic Routing Encapsulation (GRE) packet BCMCS content frame, including a sequence number and a timestamp value; and
determining, by each of first lower nodes, whether the GRE packet BCMCS content frame received from the PDSN is valid, based on the sequence number included in the received GRE packet BCMCS content frame and, if the GRE packet BCMCS content frame is valid, transmitting the GRE packet BCMCS content frame from each of the first lower nodes to second lower nodes connected downstream of each of the first lower nodes, while synchronizing the transmission of the GRE packet BCMCS content frame, based on the timestamp value included in the GRE packet BCMCS content frame.