Content for  TR 26.851  Word version:  11.2.0

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1  Scopep. 6

The present document contains the results of the work items EMM , EMM-DDE and EMM-IPME. This document does not include the results from the EMM-EFEC work item.

2  Referencesp. 6

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 26.346: "Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs".
TS 26.237: "IP Multimedia Subsystem (IMS) based Packet Switch Streaming (PSS) and Multimedia Broadcast/Multicast Service (MBMS) User Service; Protocols".
TS 26.247: "Transparent end-to-end Packet-switched Streaming Service (PSS); Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH)".
TR 26.946: "Multimedia Broadcast/Multicast Service (MBMS) user service guidelines".
RFC 6184  (May 2011): "RTP Payload Format for H.264 Video", Y.-K. Wang, R. Even, T. Kristensen, R. Jesup.
RFC 3986  (Jan 2004): "Uniform Resource Identifier (URI): Generic Syntax", R. Housley.
OMA-TS-MLP-V3_3-20100831-C: "Mobile Location Protocol 3.3".

3  Abbreviationsp. 6

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply:
Advanced Video Coding
Dynamic Adaptive Streaming over HTTP
Download Delivery Enhancements
Enhancement to FEC
Enhancements to Multimedia
File Description Table
Forward Error Correction
File deLivery over Unidirectional Transport
Global Navigation Satellite System
Global Positioning System
High Definition TV
Hypertext Transfer Protocol
Independent Data Refresh
IMS-based PSS and MBMS Streaming Synchronization Enhancements
Inter UE Session Transfer
Multimedia Broadcast/Multicast Service
Multipurpose Internet Mail Extensions
Mobile Location Protocol
Multimedia Messaging Service
Multimedia Telephony Service for IMS
Open Mobile Alliance
Over The Air
Packet-switched Streaming Service
Quality of Experience
Request For Comment
Stream Access Points
User Equipment
Uniform Resource Identifier
Uniform Resource Locator
Extensible Markup Language

4  Enhancements to Multimedia: PSS, MMS, and MBMS Enhancements and Performance Improvements (EMM)p. 7

4.1  Introductionp. 7

This clause describes the EMM use cases, associated recommended requirements, assumptions, other enhancements and provides a list of impacted technical specifications.
This document is written in a form that the recommendations made and assumptions stated are directed to authors and contributors to Technical Specifications being affected as a result of the study presented here.

4.2  Use Cases, Requirements and Working assumptionsp. 7

4.2.1  Use Case#1: Reception reporting aggregation for quick channel changep. 7

One could consider the use case of a user who is channel surfing on a set of mobile TV services. The user clicks through several channels rapidly for a brief period before settling on a single channel for a more extended period of time.
The UE is requested to send reception reports for the services he has and is continuing to consume. By aggregating the reception reports, the UE optimizes the transfer of the report.  Recommended Requirementsp. 7

  • If the next session start is less than OffsetTime after a session end, then it is recommended that a UE shall disable the backoff timer for uploading the previously collected log and shall collect the new log per the previous samplePercentage (if samplePercentage was used).
  • It is recommended that the UE shall set the upload timer again after the end of the session.
  • It is recommended that the UE should maintain the decision of whether to log or not for consistency. In case samplePercentage is specified, then calculate whether or not to perform statistical reporting again if the session start is less than OffsetTime after the end of the last viewing session.
  • It is recommended that the existing mechanism of using multipart MIME to bundle multiple single XML files shall be maintained.
  • It is recommended to make it possible that the aggregation could be made at the XML level by using a number of statisticalReport elements that may be present in a single reception report.
  • In the case of multiple aggregated RAck reporting, the implications of backward compatibility between R11 client and R10 and earlier Reception Reporting Server need to be examined and considered.
Up  Assumptionsp. 8

None identified.

4.3  Other Enhancementsp. 8

4.3.1  MBMS video enhancementsp. 8

The EMM Work Item Description has the following objective:
  • "Given the Rel-10 and Rel-11 changes on video encoding and decoding capabilities in MTSI and PSS, it is felt that MMS encoding capabilities would require an upgrade. For example MMS encoding capabilities could be aligned to MTSI mandatory H.264 Constrained Baseline Profile level 1.2 as opposed to current H.263 support. The same would apply to PSS and MBMS services which may require upgrade of mandatory and recommended codec support given the wider availability of UEs with higher video rendering capabilities (e.g. tablets). These upgrades would both improve user experience and simplify implementations".
The objective is to update video codec support of PSS, MMS and MBMS services in a consistent manner to improve video quality and simplify content preparation/adaptation, e.g. align MMS support to MTSI video codec support and improve PSS/MBMS video codec mandatory support with e.g. H.264.
In order to fulfil this objective, the following changes were made in the specification:
  • H.264 (AVC) Constrained Baseline Profile Level 1.3 is changed from recommended to mandatory for MBMS clients.
  • H.264 (AVC) High Profile Level 3.1 is mandatory for MBMS clients supporting HDTV video content at a resolution of 1280x720 (720p) with progressive scan at 30 frames per second.
  • Reference RFC 6184 [6] superseded RFC 3984 and it is now updated.

4.4  Impacted Technical Specification(s)p. 8

The changes required have been included in TS 26.346.

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