A dynamic QoS control scheme for services based on RACF

1
A dynamic QoS control scheme for services based
on RACF

• Oct. 2006
• TTC

2
Introduction
In the last Study Group 13 meeting in Geneva,
July 17-28, 2006

• Two contributions 1-2 regarding a dynamic QoS
  control scheme based on RTP/RTCP were discussed
  at Q.4/13
• The work item is on dynamic QoS control based on
  RTCP reports (with possible extensions) or
  similar mechanisms in the network as related to
  RACF and Y.mpm.

We describe a session observation method and a
system configuration for a dynamic QoS control
scheme based on RACF.
1 H. YAMADA and S. UEMURA, Proposal for
initiation of a study of the quality control
scheme for service sessions based on (S/BC)
functions, SG13 Delayed Contribution D581,
Geneva, July 2006. 2 S. UEMURA and H. YAMADA,
A QoS notification scheme for end-to-end service
session quality control, SG13 Delayed
Contribution D583, Geneva, July 2006.
3
Generic system configuration
A dynamic QoS control scheme based on RTP/RTCP
The configuration of the quality control schemes
for admission control of NGN terminals and the
control of aggregated sessions among NGN terminal.
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Observation of RTP streams using RTCP
Rec. P.564 Conformance testing for narrowband
voice over IP transmission quality assessment
models
Several operation scenarios for monitoring
session performance are discussed in ITU-T SG12
and indicated in Table 1/Rec. P.564. Especially,
in Mode A, the dynamic operation uses information
from RTCP-XR packets.
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Functionalities of PD-FE and TRC-FE
PD-FE (Policy Decision Functional Entity) The
PD-FE handles the QoS resource requests received
from the SCF via the Rs reference point or from
PE-FE via the Rw reference point. TRC-FE
(Transport Resource Control Functional
Entity) The TRC-FE is responsible for transport
technology dependent resource control such as
resource status monitoring and network
information collection.
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Multi-RTCP scheme
The Multi-RTCP scheme supports the scheme for
reporting a quality condition of a portion of the
end-to-end IP networks basis such as the FMC
networks.
Fig.1-Configuration of the Multi-RTCP scheme in
FMC networks
Fig.3- Initiation of Multi-RTCP scheme
Fig.2- Relay of Extra RTCP RR
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Evaluation of the Multi-RTCP scheme
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Evaluation of the Multi-RTCP scheme
The RTP clients which use the QoS information of
the congested network can adjust the sending bit
rate appropriately.
The RTT information of entire network A and B is
not sufficient to understand the reason for the
fluctuation of RTT.
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conclusions
We have offered the following propositions for
developing a quality control scheme for service
sessions based on RACF.

• The focus and first priority of study should be
  on the formulation of functionalities of the
  PD-FE and TRC-FE for a dynamic QoS control
  scheme.
• 2. Study should be initiated on a practical
  dynamic QoS control scheme based on RTCP reports
  (with possible extensions).
• 3. Actions should be conducted to provide
  solutions to QoS requirements and QoS metrics
  desirable to the control scheme need to be
  studied.

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References
1 H. Schulzrinne, S. Casner, R. Frederick and
V. Jacobson, RTP A Transport Protocol for
Real-Time Applications, IETF RFC 3550, July
2003. 2 ITU-T Recommendation P.564,
Conformance testing for narrowband voice over IP
transmission quality assessment models,
International Telecommunication Union, July
2006. 3 T. Friedman, R. Caceres, A. Clark, RTP
Control Protocol Extended Reports (RTCP XR),
IETF RFC 3611, November 2003. 4 ITU-T
Recommendation P.862, PESQ an objective method
for end-to-end speech quality assessment of
narrowband telephone networks and speech codecs,
International Telecommunication Union, February
2001. 5 ETSI TS 101 329-2, Digital cellular
telecommunications system (Phase 2) Adaptive
Multi-Rate (AMR) speech transcoding(GSM 06.90
version 7.2.1 Release 1998), European
Telecommunications Standards Institute, April
2000. 6 J. Sjoberg, M. Westerlund, A.
Lakaniemi, Q. Xie, Real-Time Transport Protocol
(RTP) Payload Format and File Storage Format for
the Adaptive Multi-Rate (AMR) and Adaptive
Multi-Rate Wideband (AMR-WB) Audio Codecs, June
2002.