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Presented by Greg Ratta ( ), ITU-T SG 11 Vice Chairman

Signalling of Quality of Service Within Public Telephony Networks. April 26, 2001. Presented by Greg Ratta ( ), ITU-T SG 11 Vice Chairman. Outline. Introduction - elements of QoS signalling Signaling of QoS in B-ISDN Overview of BICC QoS signalling for BICC

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Presented by Greg Ratta ( ), ITU-T SG 11 Vice Chairman

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  1. Signalling of Quality of Service Within Public Telephony Networks April 26, 2001 Presented by Greg Ratta ( ), ITU-T SG 11 Vice Chairman

  2. Outline • Introduction - elements of QoS signalling • Signaling of QoS in B-ISDN • Overview of BICC • QoS signalling for BICC • Summary

  3. ATM Service Categories *CDVT is a network characteristic and is not signaled  = network specific

  4. Guaranteed Frame Rate (GFR) • Objective: a non-real-time service that provides some QoS commitment while placing minimal constraints on the user • Major Application: Carry aggregate TCP/IP traffic between two routers • User is free to send any rate up to a PCR all the time, but network commitment is only to an MCR • GFR service is “frame-based.”

  5. Inclusion of QoS parameters in the SETUP message when the I.356 QoS class is explicitly requested (QoS value different from 0)

  6. Inclusion of QoS parameters in the SETUP message when the QoS class value is not explicitly requested and the requested ATC is an I.371 ATC

  7. Inclusion of QoS parameters in the SETUP message supported for backward compatibility

  8. What is BICC? • BICC provides a means of supporting narrowband ISDN services across a broadband backbone network without impacting the interfaces to the existing N-ISDN network and end-to-end services. • The BICC call control signaling protocol is based on N-ISUP signaling • The bearer control signaling protocols are based on different bearer technology control signaling protocols (e.g., DSS2 for AAL type 1 and AAL type 2) • The BICC call control signaling protocol should not be aware of the actual bearer transport being employed. The binding information is used to reference the bearer.

  9. BICC network architecture

  10. BICC Capability Set 1 • Forward and Backward Backbone Network Establishment • Transport Call Control via MTP SS7 or ATM • Support of most existing narrow band services. • New Backbone Network Connection (BNC) with or without Codec Negotiation • Reuse of Idle Backbone Network Connection (BNC) • Separate Release of Call and Backbone Network Connection (BNC) • Bearer Transport Types supported: AAL 1 & AAL 2

  11. BICC Capability Set 2 and Beyond • Extend BICC to the Local Exchanges • Support IP Bearer, including Tunnelling • Support of a Call Mediation Node Function • Support Structured AAL1 • New Identifiers • Traffic Group • Global Call Reference • Extend BICC to Special Resources Nodes (e.g., announcement platforms…etc)

  12. QoS Signalling in BICC CS 3 • Based on the TIPHON specifications for end-to-end QoS control • 4 TIPHON QoS service classes (Best, High, Medium and Best Effort) in ETSI TS 101 329 part 2 • the signalling and control of end-to-end QoS in TIPHON systems in ETSI TS 101 329 part 3. • Initiated joint activity with ITU-T SG 16 for: • Translation of the TIPHON defined QoS requirements and signalling flows in protocol requirements. • Definition of generic procedures in call/bearer control protocols (BICC, H.225/H.245, SIP/SDP) for end-to-end QoS service control. • The specification of a generic H.248 (Megaco) package for end-to-end QoS service control.

  13. Summary • All new services in ITU-T SG 11 to be specified for BICC before being added to ISUP or BISUP • QoS signalling available for ATM-based infrastructure • Capability for call level QoS signalling under study

  14. AAL ATM Adaptation Layer ACF Access Control Function ACN Access Concentration Node AESA ATM End System Address AGI Application Generated Identifier ANI Access Network Interface APM Application transport Message ATM Asynchronous Transfer Mode BCF Bearer Control Function BF Bearer Function BICC Bearer Independent Call Control BIWF Bearer Interworking Function BNC Backbone Network Connection CSF Call Service Function CSM Call State Model CMN Call Mediation Node B-ISUP Broadband ISUP DSS2 Digital Signalling System no.2 GAT Generic Addressing and Transport protocol GFT Generic Function Transport control GIT Generic Identifier Transport GSN Gateway Serving Node BICC Acronyms • IN Intelligent Networks • IP Internet Protocol • ISDN Integrated Services Digital Network • ISN Interface Serving Node • ISUP ISDN User Part • MTP3b Message Transfer Part no.3b • NNI Network-Network Interface • POP Point of Presence • PSTN Public Switched Telephony Network • SN Serving Node • SPOI Signalling Point of Interconnection • SS7 Signalling System no.7 • SSCOP Service-Specific Connection-Oriented Protocol • STP Signalling Transfer Point • SWN Switching Node • TDM Time Division Multiplexing • TE Terminal Equipment • TG Trunk Group • TSN Transit Serving Node • UNI User Network Interface • VCC Virtual Channel Connection • VoIP Voice-over-IP

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