Bearer Independent Call Control

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 platformsetc)

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
BICC Acronyms

• 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

• 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