Thomas Sälzer  (Huawei Technologies, LTE MBMS rapporteur) Version 1.0 MBMS support in E-UTRAN 3GPP-DVB Workshop   RCD-1100...
LTE-MBMS MBSFN principle <ul><li>Multicast/Broadcast over a Single Frequency Network (MBSFN) </li></ul><ul><ul><li>Simulca...
Overview of MBMS support in E-UTRAN <ul><li>Supported from Rel-9 </li></ul><ul><ul><li>Shared carrier deployments (TDM on ...
MBMS service area <ul><li>eNBs transmitting MBSFN are required to be synchronised in time </li></ul><ul><li>Overlap betwee...
MBMS channels <ul><li>Downlink channels related to MBMS </li></ul><ul><ul><li>MCCH Multicast Control Channel </li></ul></u...
Frame structure for shared carriers <ul><li>TDM principle  </li></ul><ul><ul><li>MBSFN is not transmitted in subframes 0, ...
Main characteristics of MBSFN Transmission scheme OFDM Channel bandwidths 1.4, 3, 5, 10, 15, 20 MHz Carrier spacing 15 kHz...
Reference  signals <ul><li>Single antenna port </li></ul><ul><li>Close frequency spacing to support larger delay spreads <...
Performance of MBSFN Summary of MBSFN performance, dedicated carrier (TR 25.912) Simulation assumptions: R1-070674:  &quot...
Alternative MBSFN numerology <ul><li>Physical layer specifications contain an alternative numerology for dedicated carrier...
MBMS overall architecture <ul><li>BMSC (broadcast multicast service center): provides functions for MBMS user service init...
MBMS RAN interfaces <ul><li>Control plane interfaces </li></ul><ul><ul><li>M3, M2 interface are control plane interfaces <...
MBMS services and higher layer protocol stack <ul><li>Different MBMS user services can be provided on multi-cast or uni-ca...
Main references <ul><li>Feasibility study for evolved Universal Terrestrial Radio Access (UTRA) and Universal Terrestrial ...
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MBMS support in E-UTRAN - March 2011

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  • what is the Maximum number of MBSFN area per MBMS service area?
    Can One MBSFN area belong to several MBMS service areas?
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  • Draft 2: updated bullets 1 and 2 to better align with 36.300
  • Draft2: Text slightly updated.
  • Draft2: Text slightly updated.
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  • MBMS support in E-UTRAN - March 2011

    1. 1. Thomas Sälzer (Huawei Technologies, LTE MBMS rapporteur) Version 1.0 MBMS support in E-UTRAN 3GPP-DVB Workshop RCD-11002 Kansas City, USA 16th March 2011
    2. 2. LTE-MBMS MBSFN principle <ul><li>Multicast/Broadcast over a Single Frequency Network (MBSFN) </li></ul><ul><ul><li>Simulcast transmission technique realised by transmission of identical waveforms at the same time from multiple cells. </li></ul></ul><ul><ul><li>An MBSFN transmission from multiple cells within an MBSFN Area is seen as a single transmission by a UE. </li></ul></ul><ul><ul><li>MBSFN reception is possible in connected and idle states independent of incoming or outgoing calls. </li></ul></ul>From &quot; LTE – The UMTS Long Term Evolution&quot; Sesia, Toufik, Baker John Wiley & Sons
    3. 3. Overview of MBMS support in E-UTRAN <ul><li>Supported from Rel-9 </li></ul><ul><ul><li>Shared carrier deployments (TDM on sub-frame level shared with unicast) </li></ul></ul><ul><ul><li>Semi-Static MBSFN areas with possible overlap </li></ul></ul><ul><ul><li>Downlink only transmission (no feedback channels) </li></ul></ul><ul><li>Supported from Rel-10 </li></ul><ul><ul><li>Counting of MBMS interested UEs in connected mode </li></ul></ul><ul><ul><li>Semi-static activation/deactivation of eMBMS session per MBSFN area </li></ul></ul><ul><li>Further work on service continuity is foreseen for Rel-11 </li></ul><ul><ul><li>Mobility (cell selection/reselection and handover) </li></ul></ul>
    4. 4. MBMS service area <ul><li>eNBs transmitting MBSFN are required to be synchronised in time </li></ul><ul><li>Overlap between MBSFN areas is supported </li></ul><ul><ul><li>One cell can belong to several MBSFN areas (up to 8 MCCHs) </li></ul></ul><ul><ul><li>An MBMS capable UE is required to receive the signal of at least one of the MBSFN areas </li></ul></ul><ul><li>Reserved cells do not contribute to MBSFN, but are time-synchronised to the cells in the MBSFN area and have restricted power on MBSFN resources in order to limit interference </li></ul>
    5. 5. MBMS channels <ul><li>Downlink channels related to MBMS </li></ul><ul><ul><li>MCCH Multicast Control Channel </li></ul></ul><ul><ul><li>MTCH Multicast Traffic Channel </li></ul></ul><ul><ul><li>MCH Multicast Channel </li></ul></ul><ul><ul><li>PMCH Physical Multicast Channel </li></ul></ul><ul><li>Multiplexing of MBMS and unicast is realized in the time domain only </li></ul><ul><li>MCH is transmitted over MBSFN in specific subrames on physical layer </li></ul><ul><li>MCH is a downlink only channel (no HARQ, no RLC repetitions) </li></ul><ul><ul><li>Higher Layer Forward Error Correction (see TS26.346) </li></ul></ul><ul><li>A single transport block is used per subframe </li></ul><ul><li>Different services (MTCHs and MCCH) can be multiplexed </li></ul><ul><li>The MCS of each MCH is fixed in the MBSFN area and selected by the network </li></ul>
    6. 6. Frame structure for shared carriers <ul><li>TDM principle </li></ul><ul><ul><li>MBSFN is not transmitted in subframes 0, 4, 5 and 9 (FDD) and subframes 0, 1, 2, 5, 6 (TDD) </li></ul></ul><ul><ul><li>The subframe ratio available for MBMS ranges from 1/320 to 192/320 </li></ul></ul><ul><ul><li>A 10/40ms pattern repeats over {1, 2, 4, 8, 16, 32}radio frames </li></ul></ul><ul><li>Single MBSFN subframe contains single cell control part and MBSFN part </li></ul>Single cell transmission Multi-cell transmission 1 ms
    7. 7. Main characteristics of MBSFN Transmission scheme OFDM Channel bandwidths 1.4, 3, 5, 10, 15, 20 MHz Carrier spacing 15 kHz Guard interval 16.7 us Modulation schemes QPSK, 16QAM, 64QAM MIMO scheme single antenna port Transport block transmission duration 1 ms Number of coded blocks per transport block Variable Typical transmit power The eNodeB (Macro cells) maximum transmit power is left to implementation, but most coexistence analyses assume Macro Tx Powers around 40W (46dBm)
    8. 8. Reference signals <ul><li>Single antenna port </li></ul><ul><li>Close frequency spacing to support larger delay spreads </li></ul>extended cyclic prefix, 15kHz carrier spacing
    9. 9. Performance of MBSFN Summary of MBSFN performance, dedicated carrier (TR 25.912) Simulation assumptions: R1-070674: &quot;LTE physical layer framework for performance verification&quot; Orange, China Mobile, KPN, NTT DoCoMo, Sprint, T-Mobile, Vodafone, Telecom Italia. Deployment Spectrum Efficiency [bps/Hz] Inter-site Distance @ 1bps/Hz [m] Case 1 3.13 1619 Case 2 3.02 2310 Case 3 0.99 1619 Case 4 3.18 4375 Case Band (MHz) Site to site distance (m) Speed (kph) 1 2000 500 3 2 2000 500 30 3 2000 1732 3 4 900 1000 3
    10. 10. Alternative MBSFN numerology <ul><li>Physical layer specifications contain an alternative numerology for dedicated carriers </li></ul><ul><li>Alternative numerology </li></ul><ul><ul><li>7.5 kHz carrier spacing </li></ul></ul><ul><ul><li>Longer guard interval of 33.3us </li></ul></ul><ul><ul><li>Reference signals as shown </li></ul></ul><ul><li>This option is currently not fully supported </li></ul><ul><ul><li>No related signalling </li></ul></ul><ul><ul><li>No related performance requirements </li></ul></ul>extended cyclic prefix, 7.5kHz
    11. 11. MBMS overall architecture <ul><li>BMSC (broadcast multicast service center): provides functions for MBMS user service initiation and delivery </li></ul><ul><li>MBMS-GW (MBMS gateway): broadcasts MBMS packets to each eNB transmitting the service on M1 interface </li></ul><ul><li>MCE (Multi-cell Coordination Entity) </li></ul><ul><ul><li>Allocates or not the radio resources used by eNBs in the same MBSFN area </li></ul></ul><ul><ul><li>Configures MBSFN subframes for MBMS control and data broadcast </li></ul></ul><ul><ul><li>Ensures that the L2/L3 layers in eNBs are well configured for MBSFN operation </li></ul></ul><ul><ul><li>Determines the MCS for PMCH </li></ul></ul>UE eNB MME BMSC MBMS GW MCE Content Provider M2 M1 Sm SGi-mb SGmb M3
    12. 12. MBMS RAN interfaces <ul><li>Control plane interfaces </li></ul><ul><ul><li>M3, M2 interface are control plane interfaces </li></ul></ul><ul><ul><li>M3 between MME and MCE carries MBMS session management signaling </li></ul></ul><ul><ul><li>A MCE is connected to all eNBs within the same MBSFN area through M2 interface mainly for MBMS session management signaling and radio configuration signaling </li></ul></ul><ul><li>User plane interface </li></ul><ul><ul><li>M1 interface is a user plane interface (no uplink data and no control plane) </li></ul></ul><ul><ul><li>A MBMS GW is connected to multiple eNBs through M1 interface for data distribution </li></ul></ul><ul><ul><li>IP multicast is used to deliver the downlink packets and SYNC protocol is used over the M1 interface to keep the content synchronization </li></ul></ul>
    13. 13. MBMS services and higher layer protocol stack <ul><li>Different MBMS user services can be provided on multi-cast or uni-cast bearers </li></ul><ul><ul><li>HTTP </li></ul></ul><ul><ul><li>File download </li></ul></ul><ul><ul><li>Audio/Video streaming </li></ul></ul><ul><li>The figure shows the related higher layer protocol stacks (TS26.346). </li></ul>
    14. 14. Main references <ul><li>Feasibility study for evolved Universal Terrestrial Radio Access (UTRA) and Universal Terrestrial Radio Access Network (UTRAN) http://www.3gpp.org/ftp/Specs/html-info/25912.htm </li></ul><ul><li>Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 http://www.3gpp.org/ftp/Specs/html-info/36300.htm </li></ul><ul><li>Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation http://www.3gpp.org/ftp/Specs/html-info/36211.htm </li></ul><ul><li>Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification http://www.3gpp.org/ftp/Specs/html-info/36331.htm </li></ul><ul><li>Evolved Universal Terrestrial Radio Access Network (E-UTRAN); General aspects and principles for interfaces supporting Multimedia Broadcast Multicast Service (MBMS) within E-UTRAN http://www.3gpp.org/ftp/Specs/html-info/36440.htm </li></ul><ul><li>Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs http://www.3gpp.org/ftp/Specs/html-info/26346.htm </li></ul>
    15. 15. Thank you !
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