Page 42 - ITU-T Focus Group Digital Financial Services – Consumer Experience and Protection

ITU-T Focus Group Digital Financial Services
Consumer Experience and Protection

Annex A: Overview of existing standards which are related to DFS

Recommendation ITU-T Y.1541 “Network performance objectives for IP-based services” specifies network
IP performance values between User Network Interfaces (UNI) for each of the performance parameters
defined in [ITU-T Y.1540]. The specific performance values vary, depending on the network QoS class. This
Recommendation defines eight network QoS classes. It applies to international IP network paths (UNI-UNI).
The network QoS classes defined here are intended to be the basis of agreements between end-users and
network service providers, and between service providers. The classes should continue to be used when static
agreements give way to dynamic requests supported by QoS specification protocols.

However, Rec. Y.1541 does only apply to fixed networks.

Figure 8: Reference path from Recommendation ITU-T Y.1541

IP network cloud
SRC (may be comprised of network sections DST
belonging to one or more network operators)

UNI ... ... UNI
TE ER ER ER ER ER ER TE
LAN LAN

Network section Network section Network section
Customer installation End-to-end IP network (network QoS) Customer installation

User-to-user connection (teleservice QoS)

TE Terminal equipment Protocol stack

ER Edge router UNI
User network interface Y.1541(11)_F01

NOTE – Customer Installation equipment (shaded area) is for illustrative purposes only.

Its counterpart in the mobile environment is 3GPP TS 23107 “Technical Specification Group Services and System
Aspects; Quality of Service (QoS) concept and architecture”.
When defining the UMTS QoS classes, also referred to as traffic classes, the restrictions and limitations of the
air interface have to be taken into account. It is not reasonable to define complex mechanisms as have been
in fixed networks due to different error characteristics of the air interface. The QoS mechanisms provided in
the cellular network have to be robust and capable of providing reasonable QoS resolution.

There are four different QoS classes in UMTS:

– conversational class;
– streaming class;
– interactive class; and

– background class.
The main distinguishing factor between these QoS classes is how delay sensitive the traffic is.

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