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M3UA (MTP3-User Adaptation Layer)

M3UA (MTP3-User Adaptation Layer). <draft-ietf-sigtran-m3ua-02.txt> ******* SS7 ****** IP ******* * SP *------------* SG *------------*IP SEP* ******* ****** ******* +------+ +------+

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M3UA (MTP3-User Adaptation Layer)

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  1. M3UA (MTP3-User Adaptation Layer) <draft-ietf-sigtran-m3ua-02.txt> ******* SS7 ****** IP ******* * SP *------------* SG *------------*IP SEP* ******* ****** ******* +------+ +------+ | ISUP | <---------------------------> | ISUP | +------+ +-------------+ +------+ | MTP | <----> | MTP | M3UA | <----> | M3UA | | L3 | <----> | L3 +------+ <----> +------+ | L2 | <----> | L2 | SCTP | <----> | SCTP | | L1 | <----> | L1 +------+ <----> +------+ | | | | UDP | <----> | UDP | +------+ +-------------+ +------+ SP - SS7 Signaling Point (SS7 SEP or STP) IP SEP - IP-based Node (e.g., MGC, IP SCP, …) User - MTP3-User Protocol (e.g., ISUP, SCCP, TUP, ..) SCTP - Simple Common Transmission Protocol Example

  2. M3UA Principles • Supports MTP3-User Interface and Services (Transparent to MTP3-User) • Open/Closes SCTP Transport Associations • Starts/Stops Traffic across an open SCTP Association • Allows Flexible Message Distribution (e.g., SS7 OPC/DPC/SLS/CIC) to ASPs • ASP Fail-over support within AS list • N+k Redundancy Support • Load-balancing Support • Allows ASP signalling through redundant SGs to SS7 Network • Does not re-encode MTP-3 Routing Label / SIO in MTP-Transfer primitive • SCTP Stream Mapping

  3. Changes in M3UA Issue 2 • Removed explicit SCN Protocol Identifier & Protocol Identifier Parameters. Now use MTP3 SIO and/or Network Appearance (if required)  • Cleaned up SG configuration terminology (i.e., Routing Key, AS, ASP, Routing Context, SPMC, Network Appearance) • Expanded to include n+k redundancy, load-sharing • Better description of fail-over operation • Added Ability for ASP to route SS7 traffic across redundant SGs • Added Point Code Lists in SSNM Messaging (DUNA, DAVA, SCON…) • Made SSNM DAUD (Audit) more flexible

  4. Changes - Continued • Added State Change Notification SG-ASPs in AS to allow better coordination • Use Cases Expanded • Added Optional M3UA-level Heartbeat

  5. Current Issues • Impact of a future registration protocol component [M3UA, M2UA, IUA] • Implementation-dependent Parameters or Messages [M3UA, M2UA, IUA] (Agreed but not added yet) • New SS7 Network Unavailable message? [M3UA] (Agreed but not added yet) • Nodal inter-working function still confusing? [M3UA] • More Use cases required in Section 4 (Agreed but not added yet) • Timer provisional values required. [M3UA, M2UA, IUA]

  6. Current Issues • ASP "graceful shutdown" case required? [M3UA, M2UA, IUA]Provide consistent use of MUST, SHALL, MAY etc as in rfc – see SCTP. New Items from List: • Add possible case of SG sending UPU message into SS7 network when it determines that all ASPs in SPMC is no longer available, at least for a particular User Part. • TCP text proposal. Sentence or two in introduction of Adaptation layer docs and later Section/Annex with more info as agreed on Design Team call? • IP to IP M3UA? Section possible to describe M3UA operation where two communicating points are in IP network with no need for an SG. Probably start with the idea that DUNA/DAVA/SCON/UPU and related procedures are omitted. Basis for BICC STC?

  7. Current Issues • Specify explicitly Data recovery from a failed SCTP Association (e.g., to ASP1) to new SCTP Association (e.g., to to ASP2) – do we attempt this. Smells like SS7 Normal Change-over – is this appropriate? Recover Unsent (Tx Buffer) only or also Sent/Unacked.(RTx Buffer). Stringent requirements for duplicated MSUs may impact choice.Other Ideas: •  SCON from ASP to SG to indicate ASP nodal congestion?

  8. Status & Work Plan • <draft-ietf-sigtran-m3ua-02.txt> currently available • Issues List substantially reduced at the Washington Design Team Meeting • Draft 03 addressing above issues end-of-April at latest • Possible Last Call

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