(Continuation of Question 14/13 studied during 1997-2000)
Background and justification
New and revised specifications for ATM cell transfer and availability
performance are needed to ensure effective deployment and application of
B-ISDN/ATM transfer capabilities.
Items for study
Reference models
1. Should new connection models be constructed to represent new applications of
ATM, such as Layer 2 transport of IP service, for example LSP for MPLS?
2. What special ATM cell transfer performance issues will arise from the use of
new access technologies, e.g. xDSL, PCS, HFC, and fixed wireless?
3. How should ATM cell transfer performance be characterized for multipoint
B-ISDN connections?
ATM performance parameters
4. What additional parameters are needed to characterize the performance of new
ATM transfer capabilities?
5. How can the definition or the measurement of CDV be improved to discriminate
between steady-state CDV and any gradual or step-wise changes in end-to-end CTD?
6. What parameters are required to describe the throughput performance of ATM
connections?
Performance objectives, QoS class definitions and performance allocation
7. To improve the responsiveness of B-ISDNs to a variety of end-user QoS
needs, how should Table 2/I.356 be updated, including new QoS classes and
updated objectives? How should the allocation scheme in section 9/I.356 be
updated? Each of these updates should take into consideration new transport
media such as wireless, HFC, xDSL and WDM.
8. What performance requirements should be established when the ATM network
is serving as a Layer 2 transport for IP service, for example when ATM and AAL
are used in connection with MPLS and LSP?
Interpreting QoS signalling
9. How should users’ (implicit and explicit) requests for QoS be
interpreted during a connection set-up request?
10. How can the QoS interworking be improved between networks based on ATM
Forum specifications and networks based on ITU-T Recommendations?
Measurement and estimation
11. How will a network provider’s commitment to the negotiated QoS be evaluated?
12. How can extremely small CLR, CER, and CMR values be estimated from small sample sizes?
AAL performance
13. How should performance at the AAL be described?
14. What is the relationship between ATM cell transfer performance and the
performance obtained from each of the AAL types?
15. What is the performance of AAL type 2 switched connections?
Availability performance
16. How should availability performance objectives be specified in
Recommendations I.357 and I.35av be specified taking into account emerging
requirements, operational experience with B-ISDN connections, and the observed
performance of associated path elements?
17. How will the QoS classes of I.356 impact the ATM availability
performance parameters and objectives specified in I.357 and I35av?
18. How should the availability performance of point-to-multipoint,
multipoint-to-multipoint, multiconnection, and multimedia services supported
by B-ISDN ATM networks be characterized?
19. What is the relationship of throughput to availability?
Specific tasks with deadlines
- Enhancements to Recommendations I.356 and review of its provisional aspects by 2002.
- New Recommendation I.35aal or supplement on AAL performance issues by 2001.
- New Recommendation I35aal2 on switched AAL type 2 connections
- New Recommendation I.35av decided by 2001 or 2002.
- Revised Recommendations I.357 by 2002.
Relationships
ITU-T Study Groups on services and network operations
ITU-T Study Groups on measurement and maintenance
ITU-T Study Groups on public data networks>
ITU-T Study Groups on performance aspects of TV and sound transmission
ITU-T Study Groups on signalling of QoS information
ITU-T Study Groups on voice and multimedia performance
ITU-R Study Groups on satellite systems
ITU-R Study Groups on mobile-satellite services
ITU-R Study Groups on radio systems
ATM Forum on performance issues
IETF on performance
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