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eMBMS for Public Safety

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Alcatel-Lucent presentation

Alcatel-Lucent presentation

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  • 1. COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. eMBMS Wim Brouwer CTO Public Safety LTE May 2013
  • 2. The Broadcast Advantage Optimized RAN and Transport Resources RAN network SGW PGW cell Content source Multiple streams of the same content delivered individually from content source RF capacity Transport capacity Server capacity RAN network Content cell COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 2 Single stream of content delivered to multiple users MBMS-GW BMSC Content source cell RF capacity Transport capacity Server capacity
  • 3. Three Key Use Cases For Public Safety 1) Streaming video for real-time situational awareness 2) Push To Talk COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 3 3) File delivery for non-real-time services such as all points bulletin (e.g. amber alert), software updates/upgrades, … 3
  • 4. First introduced in 3GPP Rel-9 eMBMS bearer provides efficient delivery over transport network and air interface • Downlink only transmission • IP multicast in transport network LTE Broadcast: evolved Multimedia Broadcast Multicast System (eMBMS) • IP multicast in transport network • Broadcast subframe in air interface --- all UEs in common broadcast group tune into the same subframes GBR bearers --- quality content delivery (e.g. video content) Transport and radio resources are set up dynamically when there is an active broadcast session BROADCAST Broadcast on selected areas COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 4 Aggregate & Distribute UNICAST selected areas Control Plane User Plane eNodeB BMSC MBMS-GW
  • 5. Multimedia Broadcast over a Single Frequency Network (MBSFN) MBSFN area: group of cells performing synchronized eMBMS transmission so signals from all cells in the area appear as multipaths to UEs (automatically combined for diversity gain) Basic building block for providing eMBMS serviceBasic building block for providing eMBMS service Same frequency; same subframe allocation and MCS selection per physical channel Similar to multipaths from a single cell, but with longer distance thus larger propagation delay need for extended Cyclic Prefix (CP) and strict synchronization Important for eMBMS due to lack of MIMO, HARQ, and frequency selective scheduling Synchronization requirements • Frequency sync: 50 ppb COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 5 scheduling Uses extended CP in eMBMS subframes and normal CP in unicast subframes • Frequency sync: 50 ppb • Phase sync: 1.5 us • Content sync: SYNC protocol between BMSC and eNB to map content to specific scheduling period
  • 6. Multimedia Broadcast over a Single Frequency Network (MBSFN) COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 6 66.6us 66.6us4.7us 16.6us Unicast subframe 7% CP overhead eMBMS subframe 25% CP overhead
  • 7. LTE Broadcast : eMBMS Flexible radio resource definition • Up to 6 out of 10 MBSFN sub-frames per frame (i.e. max. 60% loading) B B B B BB B B B = broadcast subframe 10ms radio frame - - - - - - - - - - - - - - - - 0 9 Resources allocated to eMBMS follows a cyclic pattern • eMBMS transmission can occur only on predefined radio frames • Configurable periodicity of 1, 2, 4, 8, 16 or 32 radio frames Min Subframe rate = 1 SF / 320ms B B B B BB B B Sample Subframe Configuration B = broadcast subframe - - - - - - - - - - - - - - - - - = restricted subframe (eMBMS not allowed) COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 7 Min Subframe rate = 1 SF / 320ms Max Subframe rate = 6 SF / 10ms • eMBMS subframe allocation is conveyed in SIB2 UEs can consume eMBMS services while connected or idle Flexible bandwidth allocation to eMBMS services vs. unicast: 1/320th to 6/10th
  • 8. MBSFN Area Planning Service definitions Where: distribution area What: contents When: schedule Required eMBMS capacity = f (MCS, %BW) MCS: # bits / subframe %BW: # subframes / sec Unicast traffic demand Busy hour? %BW available for broadcast Protection tier (yellow cells) may be added on top of Broadcast areas with strong signal and line of sight, as well as weak or no neighbor interference COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 8 Intended distribution area MBSFN area Interfering cells may be added on top of intended broadcast area (blue cells) to meet capacity requirement based on service definition no neighbor interference caused by either unicast or other broadcast (gray cells) may not require the use of protection tier Protection tier cells
  • 9. Service Area (1 of 2) • Service Area is a group of cells distributing a broadcast service - Typically statically defined - Can be supported by multiple whole MBSFN areas - 3GPP allows a maximum of 65536 service areas in a PLMN - No limit on # cells in a service area - No limit on # cells in an MBSFN area, or MBSFN sync area SERVICE AREA MBSFN AREA MBSFN AREA MBSFN AREA COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 9 MBSFN AREA Flexibility to design service area: Nationwide, Regional
  • 10. Service Area (2 of 2) • One cell can belong to up to 8 MBSFN areas and it can serve multiple Service Areas (SA) SERVICE AREA #N MBSFN AREA #1 MBSFN AREA #3 MBSFN AREA #2 SERVICE AREA #C SERVICE AREA #A MBSFN AREA #4 MBSFN AREA #5 SERVICE AREA #B COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 10 Content N Content N+C Content N+A Content N+B
  • 11. Service Area Example: Push To Talk State Police PTT MBSFN AREA #1 MBSFN AREA #3 MBSFN AREA #2 County Sheriff PTT Town A Police PTT MBSFN AREA #4 MBSFN AREA #5 Town B Police COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 11 Content N Content N+C Content N+A Content N+B
  • 12. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Video Server Area 1 Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu File server / CDN node Server Encoder / Segmenter Mobile Backhaul Network BMSC S11 Data Network COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 12 eMBMS elements Bearer plane Content SourceADF BMSC – Broadcast Multicast Service Center MBMS GW – MBMS Gateway MCE – Multi-cell/multicast Coordination Entity
  • 13. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 13 eMBMS elements Bearer plane ADF Content Source C-plane functions • Control eMBMS sessions: initiates session control messages (e.g. Session Start/Stop) towards MBMS-GWs • Server for file repair and reception report services: direct HTTP interface to UEs
  • 14. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 14 eMBMS elements Bearer plane ADF Content Source U-plane functions Content ingestion point Bearer content processing: FEC, FLUTE, SYNC Distributes content towards MBMS-GWs
  • 15. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 15 eMBMS elements Bearer plane ADF C-plane functions • Relays session control messages towards MMEs involved in an eMBMS session • Creates and maintains M1 GTP-U tunnel Content Source
  • 16. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 16 eMBMS elements Bearer plane ADF U-plane functions • Distributes content towards eNBs participating in an eMBMS session • Uses IP Source Specific Multicast (SSM): MBMS-GW is the source host of M1 traffic Content Source
  • 17. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 17 eMBMS elements Bearer plane ADF C-plane functions • Relays session control messages towards MCEs • Maintains M3 SCTP connection with every MCE Content Source
  • 18. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 18 eMBMS elements Bearer plane ADF MCE C-plane functions • Coordinate radio resource allocation among eNBs of the same MBSFN area to enable MBSFN operation • Deterministic admission control of eMBMS sessions Content Source
  • 19. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 19 eMBMS elements Bearer plane ADF eNB C-plane functions • Allocates radio resources per MCE instructions • Joins/leaves IP SSM channels per active eMBMS sessions Content Source
  • 20. E2E System Architecture and Environment PGWSGW SGiS5/S8 S1-U Area 1 Video Server Area 2 eNB/ MCE MBMS- GW M1 M3, S1-MME Sm SGmb UE SGi-mb MMEUu Mobile Backhaul Network BMSC S11 Data Network File server / CDN node Server Encoder / Segmenter COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 20 eMBMS elements Bearer plane ADF eNB U-plane functions • broadcasts content received over M1 GTP-U tunnels Content Source
  • 21. Sample eMBMS Capacities (10MHz FDD) Single cell with no protection tier dense urban area • Spectral Efficiency = 0.2 bps/Hz • Assume 1 subframe per 32 radio frames assigned to eMBMS• Assume 1 subframe per 32 radio frames assigned to eMBMS Total eMBMS capacity = 6 Kbps (using 0.3% of carrier) Large MBSFN dense urban area • Spectral Efficiency = 2.5 bps/Hz • Assume 1 subframe per 32 radio frames assigned to eMBMS COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 21 Total eMBMS capacity = 78 Kbps (using 0.3% of carrier) • Assume 2 subframes per every radio frame assigned to eMBMS Total eMBMS capacity = 5 Mbps (using 20% of carrier)
  • 22. eMBMS Enhancements in 3GPP Release 10 and 11 Release 10: Subframe reuse Counting ARPARP Release 11: Multi-carrier support COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 22
  • 23. • eMBMS important capability for public safety • Greatly improves efficiency when sending information to Conclusion multiple users in the same cell • Careful planning of MBSFN areas required based on the type of service - May need to do modeling for the specific type of service (e.g. PTT) COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 23
  • 24. COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 24
  • 25. COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 25
  • 26. COPYRIGHT © 2013 ALCATEL-LUCENT. ALL RIGHTS RESERVED. 26

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