The UE does not provide an IP BS Manager.
The end-to-end IP QoS bearer service towards the remote terminal is
controlled from the GGSN. The scenario assumes that the GGSN supports
DiffServ functions, and the backbone IP network is DiffServ enabled.
In this scenario, the control of the QoS over the UMTS access network
(from the UE to the GGSN) may be performed either from the terminal using
the PDP context signaling or from the SGSN by subscription data.
The IP QoS for the downlink direction is controlled by
the remote terminal up to the GGSN. The GGSN will apply receiver control
DiffServ edge functions and can reclassify the data (remarking
the DiffServ Code Point = DSCP). This may affect the QoS applied to
the data over the UMTS access (the TFT may use the DSCP to identify the
data to be allocated to the PDP context).
The end-to-end QoS is provided by a local mechanism in
the UE, the PDP context over the UMTS access network, DiffServ through the backbone
IP network, and DiffServ in the remote access network in the scenario
shown in the figure below. The GGSN provides the interworking
between the PDP context and the DiffServ function. However, the
interworking may use information about the PDP context which is
established, or be controlled from static profiles, or dynamically through
other means such as proprietary of HTTP based mechanisms. The UE is
expected to be responsible for the control of the PDP context, but this
may instead be controlled from the SGSN by subscription.
