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TR 23.844 (SA2)
Feasibility Study on
IMS-based Peer-to-Peer Content Distribution Services

ToC   3GPP‑Page   Help    
V12.0.0 (Wzip)  2012/06  41 p.

Rapporteur:  Dr. Qing, Yu
See also:  –

This study focuses on the enhancement of IMS to support Peer-to-Peer Content Distribution Services in respect of GPRS, EPC and other underlying access network technologies but not intend to modify GPRS or EPC for P2P mechanism.

The objectives are to study IMS based Peer-to-Peer Content Distribution Services on the architectural level with the following aspects:
  • Creating solutions in order to fulfil the use cases and requirements as defined by SA WG1 while avoiding duplicate work in other SDOs, such as IETF [e.g., PPSP, P2PSIP, ALTO, and DECADE], and re-using their work. The solutions should:
    • Apply the same IMS user management/registration procedure as other IMS services;
    • Be able to provide the UE with the appropriate AS to obtain the addresses of other Peers, from which the UE can retrieve the requested content;
    • Re-use ISC interface for service triggering;
    • Be able to select qualified User Peers among available UEs according to the policies preconfigured in the network.
  • Elaborate alternative solutions, which support the following network access technologies:
    • Mobile access only (e.g. UTRAN, E-UTRAN, I-WLAN);
    • Fixed access only (e.g. xDSL, LAN);
    • Fixed and mobile convergence scenarios.
  • Evaluate possible impacts and improvements on network when IMS based Peer-to-Peer Content Distribution Services are deployed, such as the interactions that are needed to adapt the peer-to-peer overlay properties to the configuration and the resources of the network.
  • Identify QoS, mobility, charging and security related requirements in the case of Peer-to-Peer Content Distribution Services on IMS.
The assessment on alternative solutions and the final conclusion of this study should not only take TR 22.906 into consideration but also comply with the related normative work in SA WG1.


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1  ScopeWord-p. 6
2  References
3  Definitions and abbreviationsWord-p. 7
4  Use casesWord-p. 8
5  Architectural requirements
6  Alternative SolutionsWord-p. 9
6.1  Alternate 1 - Signalling between User Peer and other Peers not traversing IMS coreUp
6.2  Alternate 2 - Signalling between User Peer and other User Peers traversing IMS coreWord-p. 21
6.3  Alternate 3 - Using direct interface for signalling between User Peer and Tracker AS
6.4  Architectures for IMS P2P CDS used in conjunction with CDNWord-p. 26
6.5  Including ALTO server in IMS P2P CDSWord-p. 30Up
7  EvaluationWord-p. 36
8  ConclusionWord-p. 37
A  IETF work on P2P Streaming Protocol (PPSP)Word-p. 38
B  Change historyWord-p. 41Up

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