UMTS: Alive and Well - 4G Americas
UMTS: Alive and Well - 4G Americas
UMTS: Alive and Well - 4G Americas
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
6.2.5.3 MBMS SPECIFIC REFERENCE POINTSM1. The reference point between MBMS GW <strong>and</strong> E-UTRAN/UTRAN for MBMS data delivery. IPMulticast is used on this interface to forward dataM3. The reference point for the control plane between MME <strong>and</strong> E-UTRANSm. Sm is the reference point for the control plane between MME <strong>and</strong> MBMS GWSn. The reference point between MBMS GW <strong>and</strong> SGSN for the control plane <strong>and</strong> for MBMS datadelivery. Point-to-point mode is used on this interface to forward data.SGi-mb. The reference point between BM-SC <strong>and</strong> MBMS GW function for MBMS data deliverySGmb. The reference point for the control plane between BM-SC <strong>and</strong> MBMS GW6.2.5.4 MBMS-RELATED FUNCTIONAL ENTITIESTo provide MBMS Bearer Services, existing functional entities (e.g. eNodeB/RNC <strong>and</strong>MME/SGSN), perform MBMS-related functions <strong>and</strong> procedures, of which some are specific toMBMS. An MBMS-specific functional entity, the Broadcast Multicast Service Center (BM-SC),supports various MBMS user-specific services such as provisioning <strong>and</strong> delivery. Another MBMSspecificfunctional entity, the MBMS GW, resides at the edge between the core network <strong>and</strong> theBM-SC.USER EQUIPMENT (UE)The UE supports functions for the activation/deactivation of MBMS Bearer Services. Once aparticular MBMS Bearer Service is activated, no further explicit user request is required to receiveMBMS data, although the user may be notified that data transfer is about to start. Dependingupon terminal capability, UEs may be able to store MBMS data for subsequent playback.E-UTRAN/UTRANE-UTRAN/UTRAN is responsible for efficiently delivering MBMS data to the designated MBMSservice area <strong>and</strong> has the capability of receiving IP Multicast distribution.MME/SGSNThe MBMS control plane function is supported by MME for E-UTRAN access <strong>and</strong> by SGSN forUTRAN access. MBMS-specific control plane functions include session control of MBMS bearersin the access network (e.g. Session Start, Session Stop) <strong>and</strong> transmission of session controlmessages toward multiple radio network nodes.www.3G<strong>Americas</strong>.org February 2010 Page 64
Change language