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Content for  TR 23.844  Word version:  12.0.0

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1…   6… 
1 Scope  2 References  3 Definitions and abbreviations  3.1 Definitions  3.2 Abbreviations  4 Use cases  5 Architectural requirements  5.1 Assumptions for the IMS P2P CDS  5.2 Requirements for the IMS P2P CDS 
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1  Scope  p. 6

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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2  References  p. 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.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TR 22.906: "Study on IMS based peer-to-peer content distribution services".
[3]
draft-ietf-ppsp-reqs-02  (February 2011): "P2P Streaming Protocol (PPSP) Requirements".
[4]
draft-ietf-alto-protocol-09  (June 2011): "ALTO Protocol".
[5]
TS 23.203: "Policy and charging control architecture".
[6]
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
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3  Definitions and abbreviations  p. 7

3.1  Definitions  p. 7

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.
P2P:
Peer-to-Peer, as defined in TR 22.906.
Tracker:
A directory server which maintains a list of peers storing segments for a specific content, and answers queries from peers for peer lists.
User Peer:
As defined in TR 22.906.
Network Peer:
As defined in TR 22.906.
Content Source Server:
As defined in TR 22.906.
Content Cache Server:
As defined in TR 22.906.
Content Delivery Network:
Is the network for content distribution services.
DRM Server:
The entity which manages the digital rights of digital contents to be shared within the Content Delivery Network.
Origin Server:
Stores the original content resources.
Edge Server:
Is the content server located on the edge of a CDN for content delivery.
CDN Controller:
Is responsible for allocating of content resources from the Origin Server to the Edge Servers as well as for allocating of a neighbouring Edge Server to the CDN.
Bitmap:
Describes which parts of the content are stored in a User Peer or Network Peer.
Swarm:
A swarm refers to a group of clients (i.e., Peers) who exchange data to distribute the same content (e.g. video/audio program, digital file, etc) at a given time.
Cost Map:
Defines Path Costs amongst sets of source and destination Network Locations. Path Costs are generic costs and can be internally computed by a network provider according to its own needs.
Network Map:
Is the resulting set of endpoints which are grouped together according to the Network Location endpoint property to indicate their proximity.
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3.2  Abbreviations  p. 7

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.
IMS P2P CDS
IMS based P2P Content Distribution Services
CDN
Content Delivery Network
CSS
Content Source Server
CCS
Content Cache Server
DRM
Digital Right Management

4  Use cases  p. 8

The use cases of the IMS P2P CDS are described in clause 5 of TR 22.906.

5  Architectural requirements  p. 8

5.1  Assumptions for the IMS P2P CDS  p. 8

  • This document only considers large data volume services like content on demand, video streaming, etc. It does not consider voice services.

5.2  Requirements for the IMS P2P CDS  p. 8

  • The system shall support a mechanism to provide address information for accessing an IMS based P2P content distribution service for an IMS P2P CDS UE.
  • The system shall support a mechanism to provide to User Peers an optimal selection of User Peers and Network Peers for obtaining requested media content from, based upon metrics including:
    • access type such as UTRAN, E-UTRAN, I-WLAN, xDSL and LAN.
    • offloading capability.
    • traffic conditions such as traffic congestion in the radio access network and carrier network, assigned uplink/downlink bandwidth of User Peer and Network Peer.
    • What traffic condition information consists of is for further study.
    • path cost information (e.g. least hop routing).
    • location information such as proximity of peers, peer IP addresses (including IPv4 and/or IPv6 types), and peer identities.
    • capabilities and workload of the IMS P2P CDS UE such as cache volume, current battery left and number of P2P clients being served by it.
  • The system shall provide QoS for IMS P2P CDS.
  • The IMS P2P CDS sessions shall minimize the negative impact on QoS for ongoing sessions to the same UE and shall minimize the negative impact on QoS for the operator network.
  • The system shall support a content delivery function to distribute contents or content segments from the Content Source Server to the Content Cache Servers.
  • The system shall support an interworking mechanism, which is able to utilize an enhanced existing CDN, to distribute contents or content segments from the Content Source Server/Origin Server to the Content Cache Servers/Edge Servers.
  • The system shall provide a mechanism to guarantee the copyright protected digital contents to be shared among the IMS P2P CDS users in a legal way.
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