Cisco Cisco ASR 5000
Quality of Service (QoS) Management for SGSN
▀ Quality of Service Management
▄ SGSN Administration Guide, StarOS Release 18
Scenario-10:
Description of the scenario:
Outbound RAU or Forward Re-location Request is sent towards a Gn/Gp SGSN.
QoS mapping for the scenario:
1. Subscribed QoS = Mapped from subscribed EPS QoS
2. Requested QoS = Return the MS requested value
3. Negotiated QoS = Mapped from the current EPS QoS
4. The mapping of EPS QoS to pre- release “8” QoS is as described in scenario-2.
5. When mapping subscribed EPS QoS to pre-release “8” MBR and GBR the following rules are applied:
2. Requested QoS = Return the MS requested value
3. Negotiated QoS = Mapped from the current EPS QoS
4. The mapping of EPS QoS to pre- release “8” QoS is as described in scenario-2.
5. When mapping subscribed EPS QoS to pre-release “8” MBR and GBR the following rules are applied:
MBR-UL = APN-AMBR-UL
MBR-DL = APN-AMBR-DL
GBR-UL / DL = “0” (for TC = interactive / background)
GBR-UL / DL = APN-AMBR-UL / DL (for TC = interactive / background)
Scenario-11:
Description of the scenario:
Initiating modify a PDP towards UE from SGSN (for instances of P-GW initiated QoS modification, HSS initiated
modification and so on.)
modification and so on.)
QoS mapping for the scenario:
The current EPS QoS at SGSN is mapped to pre-release “8” QoS as described in Scenario-2.
QoS Handling During Primary PDP Activation
QoS Handling When EPS Subscription is Available
1. The subscribed APN-AMBR and ARP values are sent in Create Session Request to SGW or PGW.
2. The PGW can change the APN-AMBR value in Create Session Response.
3. The SGSN accepts the APN-AMBR value sent by the PGW. No further negotiation happens as described in
2. The PGW can change the APN-AMBR value in Create Session Response.
3. The SGSN accepts the APN-AMBR value sent by the PGW. No further negotiation happens as described in
3GPP TS 23.060 section 9.2.2.1A, list item “d”.
4. In most cases the S4-SGSN does not perform any further QoS negotiation. (However, there is a special case of
SGSN capping the bit rate sent to RAN at 16Mbps. This requirement will be supported in future releases).
5. The S4-SGSN maps the received APN-AMBR to MBR values as per the mapping table provided in 3GPP TS
23.203 Table 6.1.7 and 3GPP TS 23.401 Annex E.
6. The mapped MBR values are sent to the RNC in RAB assignment request and in Activate Accept to the UE.
7. In Release 14.0 local override of APN-AMBR / ARP based on CLI configuration is supported.
7. In Release 14.0 local override of APN-AMBR / ARP based on CLI configuration is supported.
QoS Handling When Only GPRS Subscription is Available
1.
2. The requested QoS from UE and the subscribed QoS are negotiated, the SGSN chooses the least of the two
2. The requested QoS from UE and the subscribed QoS are negotiated, the SGSN chooses the least of the two
values as the negotiated output. If the requested QoS is the Subscribed QoS, the SGSN chooses the Subscribed
QoS as is. If any local QoS capping is configured, the Negotiated QoS is the least of Requested QoS or
Subscribed QoS capped by local values).
QoS as is. If any local QoS capping is configured, the Negotiated QoS is the least of Requested QoS or
Subscribed QoS capped by local values).