lte broadcast poster
DESCRIPTION
LTE BroadcastTRANSCRIPT
eMBMS Architecture
ENENSYS Technologies | 6 rue de la Carrière | CS 37734 | 35577 CESSON-SÉVIGNÉ Cedex | FRANCE
UE
LTE existing ElementMME Mobility Management UnitPGW PDN GatewaySGW Serving GatewayeNB E-UTRAN Node BUE User Equipment
New LTE Elements for eMBMSBM-SC Broadcast Multicast Service CenterMBMS-GW eMBMS GatewayDistribute IP multicast content to eNodeB over M1 interface (GTP_u). MBMS Session Control Signaling to MME.
MCE Multi-cell Coordination EntityCoordinates transmissions from multiple cells. Allocates time and frequency radio resources and radio configuration on all eNodeB in the MBSFN area. The MCE can be a separate entity or part of eNodeB.
UnicastMulticast
X2
S1-MME
S1-U
M1
M3
Sm
SGmb
SGi
SGi-mb
S11
S5
M2
SGW
MME
PGWMCE
SGi
eMBMS new entitieseMBMS User Plane (Data traffic)eMBMS Control Plane (Signaling)eMBMS Service layer & Security SignalingLTE unicast control points & interfacesSYNC Protocol
MBMS-GW BM-SC
LTE BROADCAST
BM-SC & eMBMS Gateway Functional Elements
MBSFN AREA & SERVICE AREA
MBSFN Synchronization AreaAn area of the network where all eNodeBs can be syn-chronized and perform MBSFN transmissions. MBSFN Synchronization Areas are capable of supporting one or more MBSFN Areas. On a given frequency layer, an eNodeB can only belong to one MBSFN Synchroniza-tion Area.MBSFN Synchronization Areas are independent from the definition of MBMS Service Areas.
MBMS Service AreaThe area within which data of a specific MBMS session (or service) are sent. Each MBMS Session of an MBMS Service may be sent to a different MBMS Service Area.
MBSFN AreaConsists of a group of cells within an MBSFN Synchro-nization Area of a network, which are co-ordinated to achieve a MBSFN Transmission. A cell within an MBSFN Synchronization Area may form part of multi-ple MBSFN Areas, each characterized by different transmitted content and participating set of cells.
MBSFN Area Reserved CellA cell within a MBSFN Area which does not contribute to the MBSFN Transmission. The cell may be allowed to transmit for other services but at restricted power on the resource allocated for the MBSFN transmission.
2
2
2
1
2
2
2
1
3
3
1 1
1
2+32+3
1+21+2
1+2
1+2
Service Area (SA) – A
Synchronization Area (SY)
SA - B SA - CArea 3
Area 1 Area 2
SY
Area 4
SY SA - ESA - D SY
Area 5 Area 6 Area 7
A+B A+C A A A+D A+D A+E
Service AreaSynchronization AreaArea
SYNC MODULE, ENABLING SFNFOR LTE BROADCAST
Several eNodeBs are required to pave an MBSFN AreaEach eNodeB must send the same content at the same time & frequency.
eNodeBs location spread generates multipath receptionUE receives signal from several eNodeBs, each signal being delayed with reduced amplitude.
Managing Inter-Symbol Interference (ISI)This spread creates ISI. A guard interval is added to the signal: As long as the signals spread is shorter than the guard interval, an ISI-free signal can be reconstructed from these paths.
Must synchronize all eNodeBs within a MBSFN AreaThe synchronization of all eNodeBs guarantees that each MBMS bearer will be ISI free and optimally decoded.
SYNC protocolEach MBMS bearer carries SYNC informa-tion to synchronize all eNodeBs within a MBSFN Area to ensure the UE receives constructive signal from these eNodeBs (ensures that each eNodeB transmits the same content at the same time/frequency).
www.enensys.com/LTE-Broadcast
MME
SGi
Sm SGmb
HTTP (FR/RR) HTTP (FR/RR)
eNodeB M1 SGi-mb
GATEWAY
Encoder
CDN
BM-SC
GTP_uencapsulation SYNC
FLUTEFEC
RTPFEC RTP
HTTP
DASH
Security & Membership
Service Announcement
Session & transmission
Reception Reporting
File Repair
(Forward SessionManagement
to MME)
Control Plane
eNodeB MBMS GW
User Plane
MBMS GW BM-SC
Protocol stack Uplane Data Uplane Data
SYNC SYNC
UDP UDP
IP IP
Protocol stack
SYNC SYNC
GTP-U GTP-U
UDP UDP
IP IP
Uplane Data Uplane Data
MME MBMS GW
Protocol stack
GTPv2-C GTPv2-C
UDP UDP
IP IP
Protocol stack
Diameter Diameter
TCP/SCTP TCP/SCTP
IP IP
MBMS GW BM-SC
t Delayed signals seen as echoes
Delay spread shorter than GI
Guard Interval (GI) FFT window ISI free signal
Cyclic Prefix
eNB
eNB
eNB
DATA NETWORK
Encoder
CDN
SessionControl
Signalling
PGW