Relative time based MBSFN content synchronization

In LTE, enhanced MBMS (eMBMS) allows the combining of MBMS transmission from tightly synchronized cells, in a technique known as Multimedia Broadcast Single Frequency Network (MBSFN). In MBSFN transmission, all eNodeBs in a given MBSFN area must have the radio frames transmitted with the same physical symbol timing. With use of the Extended Cyclic Prefix and the Synchronization Protocol(SYNC) running between the BM-SC (Broadcast/Multicast Service Center) and eNB(eNodeB), it is possible to synchronize content transmission from multiple eNBs. The synchronization protocol layer in BM-SC shall set Time Stamp value that indicates the relative time value of the synchronization sequence. This paper investigates how eNodeB can ensure synchronized MBSFN content transmission with the use of common relative time reference.