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User Application-to-User Plane Vertical Interface (draft-ash-nsis-vertical-interface-00.txt) PowerPoint Presentation
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User Application-to-User Plane Vertical Interface (draft-ash-nsis-vertical-interface-00.txt). Jerry Ash gash@att.com. Al Morton acmorton@att.com. Martin Dolly mdolly@att.com. Percy Tarapore tarapore@att.com. Chuck Dvorak cdvorak@att.com.

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user application to user plane vertical interface draft ash nsis vertical interface 00 txt
User Application-to-User PlaneVertical Interface(draft-ash-nsis-vertical-interface-00.txt)

Jerry Ash

gash@att.com

Al Morton

acmorton@att.com

Martin Dolly

mdolly@att.com

Percy Tarapore

tarapore@att.com

Chuck Dvorak

cdvorak@att.com

summary draft ash nsis vertical interface 00 txt
Summary(draft-ash-nsis-vertical-interface-00.txt)
  • proposes requirements for communicating QoS parameters between user application layer & user plane layer
    • currently no vertical interface protocol (VIP) to do this
    • signaling protocol assumptions
      • SIP at user application layer
      • QoS-NSLP at user plane layer
  • illustrative example of high-priority, emergency telecommunications service (ETS) VoIP call flow
  • protocol extensions to meet VIP requirements TBD
    • adaptation of QoS-NSLP could be appropriate basis for VIP
      • RESERVE & RESPONSE messages satisfy requirements for VIP-request & VIP-response messages
      • QSPEC parameters already defined to convey necessary QoS parameter information
    • future versions of document will specify more details
  • next steps
    • gage interest within NSIS
example call flow draft ash nsis vertical interface 00 txt1
Example Call Flow(draft-ash-nsis-vertical-interface-00.txt)
  • ETS user dials 1-710-NCS-GETS to establish ETS VoIP call
  • call routed by local exchange carrier (LEC) access network to service provider's GW1
  • GW1 recognizes ETS call based on dialed number or SS7 initial address message indicator
  • GW1 formulates SIP INVITE message marked with appropriate packet markings
    • SIP with pre-conditions used to negotiate codec bandwidth
    • RPH populated with ETS namespace, with priority set to "0" for highest priority (i.e., ets.0)
  • GW1 infers additional QoS parameter based on info available at access network interface (trunk group characteristics, dialed number, SS7 initial address message, etc.)
    • Y.1541 QoS class set to class 0 with stringent delay requirements
    • DiffServ PHB set to high-priority expedited forwarding (EF1)
    • Reservation Priority set to high
    • Restoration Priority set to high
example call flow draft ash nsis vertical interface 00 txt2
Example Call Flow(draft-ash-nsis-vertical-interface-00.txt)
  • GW1 communicates QoS parameter info via VIP to NSIS QoS-NSLP user-plane function
  • NSIS QoS-NSLP user-plane function sets upETS call flow withY.1541-QOSM & required attributes in the QSPEC
    • <Bandwidth> = negotiated bandwidth
      • <Y.1541 QoS Class> = class 0
      • <DSTE Class Type> = class type 0
      • <Reservation Priority> = high
      • <Restoration Priority> = high
next steps
Next Steps
  • gage interest within NSIS WG
  • if interest progress draft in NSIS WG
    • define adaptation of QoS-NSLP to support VIP-request & VIP-response messages