SGSN9810
support both Gb over FR and Gb
over IP.
-In 3GPP, it specify the
Network Service (NS) layer can be carried by a frame relay network or an IP
network.
-In a Gb over IP network, a NS-VC is
defined by a quadruple consisting of the
SGSN IP address, SGSN UDP port number, BSS IP address, and BSS UDP port number.
Functions – Differential Service
The
differential service enables operators to define priorities for subscribers in
which resources are controlled depending
on users priorities.
Subscribers
are grouped into three classes according to their priorities:
-Special subscribers
-High-end subscribers
-Common subscribers
Operators
can offer different services to different subscribers through the following two
methods:
-Specifies the threshold
of MM
resources usage to limit the attach and routing area update (RAU) of
some subscribers.
-Specifies the threshold of
SM resources to limit certain services (PDP contexts) of some subscribers.
Functions - Handover Strategy Control
The
handover strategy control helps operators in distributing traffic and balancing
service load between 2G networks and 3G networks.
This
function is applicable to the 2G and 3G supportive terminals that are allowed
to access 2G/3G network.
When
a terminal is in a 3G network,. The handover strategies include:
-Handover to 2G network
recommended
-Handover to 2G network not
recommended
-Stay in the 3G network
When
a terminal is in a 2G network,. The handover strategies include:
-Handover to 3G network
recommended
-Handover to 3G network not
recommended
-Stay in the 2G network
