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CAT over AT: status and next steps

This document provides a comprehensive overview of the status and next steps regarding the CAT over AT requirements discussed during the ETSI SCP meetings held in Sophia Antipolis from January 10-14, 2011. It outlines the history of the requirements from their agreement in July 2009, through technical architecture developments, to current proposals. Key discussions include the evolution of requirements, proposed solutions, and decision points regarding routing and architecture, emphasizing the balance between legacy compatibility and future extensibility.

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CAT over AT: status and next steps

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  1. CAT over AT: status and next steps ST Incard ETSI SCP REQ, Sophia Antipolis, 10-12 Jan 2011 ETSI SCP, Sophia Antipolis, 12-14 Jan 2011

  2. A brief history • CAT over AT requirements were agreed in July 2009 • First technical architecture presented by Incard covering all reqs in Sept 2009 • Requirements improved (multiple legacy CEs and security) in Q1 2010 • Conf call in April 2010 – job split with 3GPP • CRs approved in CT1 in September 2010 Targetting Release 9 at the beginning!!!

  3. Current status • 4 Proposal are under discussions: • SCPTEC 529r1 by T-Mobile New proposal presented in SCP TEC #36 introducing encapsulation of tk commands/response. • SCPTEC 530r1 by France Telecom Based on Incard proposal from Sept 2009 with Explicit Routing TLV • SCPTEC 543 by France Telecom Based on Incard proposal from Sept 2009 but introducing Device Identity based routing • SCPTEC 413r2 by G&D No explicit routing by Toolkit application

  4. Requirement coverage • Requirements have been mainly approved in July 2009 and partially evolved in March 2010 • No CRs in Req after March 2010 • Requirements include possibility of: • Legacy / Enhanced architecture • Explicit routing for Enhanced • Default routing for Legacy • Security requirements (added in March 2010) • Solutions 1,2,3 cover the legacy / enhanced reqs • Multiple connected entities have been removed to stay aligned with CT, but mechanism to extend is provided • Solution 4 cover mainly the legacy reqs

  5. Actually two main options are avail • “Simple” solution (G&D) • Fulfills only a subset of requirements • Compatible with current CT output • Low impact on Card / modem architecture • No explicit routing – only legacy; relies on an external entity (the multiplexer) for explicit routing • “Full” solution (FT/Incard or T-Mobile) • Fulfills most of the requirements (security requirements not yet) • Compatible with current CT output, but CT docs should be extended to support multiple CEs. • Impact on Card / modem architecture • Both explicit routing and legacy are supported • Actually decision between one or the other is a decision among simplicity and flexibility

  6. The main discussion points • Allow or not for future extensions explicit routing toward multiple connected entities Required by SCP REQ but out of scope (no technical solution so far) with current CT docs • Maintain legacy architecture Required by SCP REQ but critical in terms of compatibility with already existing applications • Data format (routing TLV, encapsulation, dev. id….) For ST Incard it is the minor point – but most discussions are focused on this point

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