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Content for  TR 26.881  Word version:  15.0.0

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0  IntroductionWord‑p. 5

The present document studies solutions to recommend application layer FEC technologies which will provide the most significant enhancement to the performance of Mission Critical services (i.e., MCVideo, MCPTT and MCData) for Release 15.

1  ScopeWord‑p. 6

The objective of the present document is to document the progress of the study item to investigate and recommend an FEC scheme for MCVideo that can be utilized equally by the two FEC procedures specified in TS 23.280. The study will also consider whether the same or a similar scheme may be utilized for other MC services over MBMS (e.g. MCData - file download, or MCPTT group communications). The use of FEC is within the context of the MC services common functional architecture as explained in subclause 5.2.6 of TS 23.280. This study item will build upon the existing stage-2 application architecture for MC services as defined in TS 23.280, TS 23.281, TS 23.282, and TS 23.379.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 22.146: "Multimedia Broadcast/Multicast Service (MBMS); Stage 1".
[3]
TS 22.179: "Mission Critical Push to Talk (MCPTT) over LTE; Stage 1".
[4]
TS 22.281: "Mission Critical Video services over LTE".
[5]
TS 22.282: "Mission Critical Data over LTE".
[6]
TS 23.203: "Policy and charging control architecture".
[7]
TS 23.280: "Common functional architecture to support mission critical services; Stage 2".
[8]
TS 23.281: "Functional architecture and information flows to support Mission Critical Video (MCVideo); Stage 2".
[9]
TS 23.282: "Functional architecture and information flows to support Mission Critical Data (MCData); Stage 2".
[10]
TS 23.379: "Functional architecture and information flows to support Mission Critical Push To Talk (MCPTT); Stage 2".
[11]
TS 23.468: "Group Communication System Enablers for LTE (GCSE_LTE); Stage 2".
[12]
TR 23.780: "Study on Multimedia Broadcast and Multicast Service (MBMS) usage for mission critical communication services".
[13]
TS 24.380: "Mission Critical Push To Talk (MCPTT) media plane control; Protocol specification".
[14]
TS 26.179: "Mission Critical Push To Talk (MCPTT); Codecs and media handling".
[15]
TS 26.281: "Mission Critical Video (MCVideo); Codecs and media handling".
[16]
TS 26.346: "Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs".
[17]
TR 26.947: "Multimedia Broadcast/Multicast Service (MBMS); Selection and characterisation of application layer Forward Error Correction (FEC)".
[18]
TR 26.989: "Mission Critical Push To Talk (MCPTT); Media, codecs and Multimedia Broadcast/Multicast Service (MBMS) enhancements for MCPTT over LTE".
[19]
TR 36.829: "Enhanced performance requirement for LTE User Equipment (UE)".
[20]
TR 36.868: "Evolved Universal Terrestrial Radio Access (E-UTRA); Study on group communication for E-UTRA".
[21]
TR 36.890: "Study on Support of single-cell point-to-multipoint transmission in LTE".
[22]
RFC 6363:  "Forward Error Correction (FEC) Framework" M. Watson, A. Begen and V. Roca, October 2011.
[23]
Recommendation ITU-R M.2377-0: "Radiocommunication objectives and requirements for Public Protection and Disaster Relief (PPDR)".
[24]
R1-120831: "Reply LS on LS on MBMS FEC Evaluation Framework ".
[25]
IETF Internet Draft: "Forward Error Correction (FEC) Framework Extension to Sliding Window Codes" V. Roca and A. Begen.
[26]
IETF Internet Draft: "The Sliding Window Random Linear Code (RLC) Forward Erasure Correction (FEC) Scheme for FECFRAME".
[27]
RFC 6681:  "Raptor FEC Schemes for FECFRAME" M. Watson, T. Stockhammer and M. Luby, August 2012.
[28]
"Mobile Data Broadcasting over MBMS Tradeoffs in Forward Error Correction" M. Luby, M. Watson, T. Gasiba, and T. Stockhammer, Proceedings of the 4th international conference on Mobile and ubiquitous multimedia, 2006.
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3  Definitions and abbreviationsWord‑p. 7

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Multimedia Broadcast/Multicast Service (MBMS):
See TS 22.146.
Mission Critical:
Quality or characteristic of a communication activity, application, service or device, that requires low setup and transfer latency, high availability and reliability, ability to handle large numbers of users and devices, strong security and priority and pre-emption handling.
Mission Critical Applications:
Generic communication applications with mission critical characteristics, traditionally encompassing push-to-talk voice (MCPTT), real-time video (MCVideo) and real-time data (MCData).
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3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
BM-SC
Broadcast-Multicast - Service Centre
CBR
Constant Bit Rate
FEC
Forward Error Correction
GCS AS
Group Communication Service Application Server
GCSE_LTE
Group Communication Service Enabler over LTE
MBMS
Multimedia Broadcast/Multicast Service
MC
Mission Critical
MCData
Mission Critical Data
MCH
Multicast Channel
MCPTT
Mission Critical Push-To-Talk
MCS
Modulation and Coding Scheme
MCVideo
Mission Critical Video
MSP
MCH Scheduling Period
PER
Packet Error Rate
PPDR
Public Protection and Disaster Relief
SDP
Session Description Protocol
SNR
Signal-to-Noise Ratio
UC
Unicast
UE
User Equipment
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