5 Conclusion
In this article we presented an overview of the
QoS framework of the UMTS with a focus on
the packet domain. The QoS is provisioned per
session through the establishment and mainte-
nance of bearers at the different layers of UMTS.
The QoS profile of a session includes parameters
describing the characteristics of the traffic flow
so as to enable efficient resource allocation.
We also described the ongoing work and
assumptions regarding the provisioning of an
end-to-end bearer service. Among other issues
the mapping of IP QoS to UMTS QoS is a chal-
lenging task and the co-ordination of the call
control and the end-to-end bearer control needs
to be improved.
6 References
1 3GPP. QoS Concept and Architecture, v
3.5.0.(TS 23.107)
2 3GPP. End to End QoS Concept and Archi-
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3 3GPP. IP Multimedia(IM) Subsystem-stage
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4 3GPP. Handover for real time Services from
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6 3GPP. Network Architecture, v 5.1.0.(TS
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