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Enhancing Bulk Signaling in Diameter with General Purpose Sessions

This document outlines a minor extension to the Diameter protocol, specifically proposing the General Purpose (GP) Session for facilitating bulk signaling. The GP Session allows for the establishment of dedicated sessions to apply attributes/values to multiple users without the need for new command codes. It highlights use cases such as bulk session termination, policy enforcement, and recovery from failures. The text discusses the stepwise realization of this concept and coding options for efficient bulk signaling, along with deployment-specific guidelines, benefitting the Diameter Integration (DIME) working group.

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Enhancing Bulk Signaling in Diameter with General Purpose Sessions

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  1. Diameter General Purpose Sessiondraft-liebsch-dime-diameter-gps-01.txt M. Liebsch, G. Punz IETF79, BeijingDiameter Extensions (DIME) WG 11th November 2010

  2. Outline • Idea behind this minor extension • Again: Use cases • Stepwise Realization • Coding options for bulk signaling • Next

  3. History • Initial version presented at IETF78 in Maastricht • Many comments received • First revision addresses comments and adds more details as well as clarifications

  4. Idea behind the GP Session (1/2) • Eshablish a dedicated session (and Session-ID) to signal multi-user context (bulk signaling)  GP Session • Clarification: GP Session-ID does not identify a group of users! • GP Session-ID.. • .. allows the re-use of available commands (e.g. STR), which mandate a single Session-ID AVP, to signal attribues/values applying to multiple users • RFC3588: Single Session-ID AVP at fixed location (after Diameter header) identifies the user where subsequent attribute/values apply to • .. indicates that attributes/values apply to a group of users or all users! • .. avoids specification of new command codes and formats for bulk signaling

  5. Idea behind the GP Session (2/2) AVPs apply to single user Single-user context(RFC3588) Diameter Hdr Session-ID AVPs Maintain standard format,but adopt new interpretation AVPs apply to group of users Multi-user context/ Bulk signaling Diameter Hdr GP Session-ID Users AVPs - Group-ID - List of individual Session-IDs - Grouped AVP

  6. Again: Use cases • Bulk signaling, e.g. • Bulk Session Termination using STR • Bulk policy enforcement • Recovery from total/partial Diameter node failure Server states restoration Group policy enforcement server server Req(multiple users [failed_server_id]) Req(multiple users, context1, context2, ...contextN) Resp (multiple users,context1, context2,... contextN) client client PCEF data traffic Policy Enforcement

  7. Stepwise realization of the extended session concept Deployment-specificguidelines forbulk signaling Specify GP Sessionextension Bulk-signaling operation andextensions specified in Applications Deployment by usingRFC4006+ and RFC4005+ Deployment-specific guidelines and specification (e.g. By 3GPP) NASREQRFC4005 BulkExt. BulkExt. NASREQRFC4005+ Credit ControlRFC4006 Credit ControlRFC4006+ GPS GPS Diameter Base RFC3588 Diameter Base RFC3588

  8. Coding options for bulk signaling(in the order of efficiency) • Group-ID identifies multiple users, list of attributes/values applies to all users of the group • List of Session-IDs identifies a group of users, list of attributes/values applies to all users of the group • List of Session-IDs identifies multiple users, each Session-ID has an individual list of AVPs associated Diameter Hdr GP Session-ID AVP 1 AVP 2 AVP N Group-ID Diameter Hdr GP Session-ID AVP 1 AVP 2 AVP N Session-ID 1 Session-ID K Diameter Hdr GP Session-ID Session-ID 1 AVP 1.1 AVP 1.2 AVP 1.N Session-ID K AVP K.1 AVP K.2 AVP K.N

  9. Next • More details to be elaborated and specified • Concept of interest to the DIME WG?

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