Side_1_360

3.3.1 QoS Management for the Control
Plane
The UMTS BS Managerin the UE, CN EDGE
and the Gateway signal between each other and
via the translation function with external in-
stances to establish or modify a UMTS bearer
service. Each of the UMTS BS managers inter-
rogates its associated admission/capability con-
trol whether the network entity supports the
requested service and whether the required
resources are available. Additionally, the CN
EDGE UMTS BS manager verifies with the
Subscription Control the administrative rights
for using the service.

In requesting a service the UMTS BS manager
of the CN EDGE translates the UMTS bearer
service attributes into Radio Access Bearer
(RAB) service attributes, Iu bearer service
attributes and CN bearer service attributes.

The RAB managerverifies with its admission/
capability control whether the UTRAN supports
the specific requested service and whether the
required resources are available. It translates the
RAB service attributes into radio bearer service
and Iu bearer service attributes and requests the
radio BS managerand the Iu BS managerto
provide bearer services with the required
attributes.

The Gateway UMTS BS manager translates the
UMTS bearer service attributes into CN bearer
service attributes and requests its CN BS man-
agerto provide the service. To support the trans-
port into external environments, the UMTS BS
manager communicates with a translation func-
tion who translates the UMTS bearer service
attributes into the external bearer services and
requests the service from the Ext BS manager.

Radio BS managers, Iu BS managers and CN BS

managers use services provided by lower layers

as indicated in Figure 3-2.

Admission/Capability controlmaintains infor-

mation about all available resources of a net-

work entity and about all resources allocated to

UMTS bearer services. It determines for each

UMTS bearer service request or modification

whether the required resources can be provided

by this entity, and it reserves these resources if

allocated to the UMTS bearer service. The func-

tion also checks the capabilities of the network

entity to provide the requested service, i.e.

whether the specific service is implemented and

not blocked e.g. for administrative reasons.

3.3.2 QoS Management for the

User Plane

Figure 3-4 depicts the functions taking place

prior to or during user data transport through the

UMTS network. The user traffic traverses sev-

eral UMTS specific functions to adapt the traffic

to the UMTS transport functionality. The func-

tions can be categorised into the following enti-

ties:

• Classification:The classification function
  (Class), which is located both in the Gateway
  and in the UE, assigns user data units received
  from the external bearer service or internal
  service interface to the appropriate UMTS
  bearer service. This is done according to the
  QoS requirements of each user data unit.


• Conditioning:The traffic conditioner (Cond.)
  in the UE provides conformance of the uplink
  user data traffic with the QoS attributes of the
  relevant UMTS bearer service. In the Gateway
  a traffic conditioner may provide conformance

Figure 3-3 QoS management

functions for the UMTS bearer

service in the control plane

MT UTRAN CN EDGE Gateway Ex.

Netw.

Local BS

Manager

Radio

Manager

Radio

Manager

Iu BS

Manager

Iu BS

Manager

CN BS

Manager

CN BS

Manager

Ext BS

Manager

UTRA

ph BS M

UTRA

ph BS M

Iu NS

Manager

Iu NS

Manager

BB NS

Manager

BB NS

Manager

RAB

Manager

UMTS BS

Manager

UMTS BS

Manager

UMTS BS

Manager

Transl.

Adm/Cap

Control

Adm/Cap

Control

Adm/Cap

Control

Subsc

Control

Local BS

manager Transl.

Ext.

Service

Control

protocol interface service primitive interface