SGSN9810 supports the four
classes of QoS
services : conversational, streaming, interactive and background defined by
3GPP through the following ideas:
Access control
−The SGSN can deny the MS
access if QOS negotiation fails
QoS queue management
−Data packets are scheduled
according to their different QOS
Differential service (DiffServ)
−In the DiffServ
system, the network node determines the per-hop behaviors (PHB) according to
the differentiated services code point (DSCP) of the IP header.
QoS mapping
−Mapping between QoS
requirements for different protocols
& versions
CAR and remarking
−In case data packets exceeds
the requested QOS ; SGSN can apply CAR or remarking procedure for controlling
this
