Cisco Cisco Packet Data Gateway (PDG)
SGSN Changes in Release 17
▀ SGSN Enhancements for 17.2
▄ Release Change Reference, StarOS Release 17
482
1. An UPCQ from GGSN is received for a PDP-context
2. MS modify request and MS modify accept procedures occur.
3. Direct tunnel is disabled during this step and UPCR is sent to the GGSN with cause as “Accepted” (DTI
2. MS modify request and MS modify accept procedures occur.
3. Direct tunnel is disabled during this step and UPCR is sent to the GGSN with cause as “Accepted” (DTI
information is not sent).
4. Direct tunnel procedure is initiated and the RAB is released and re-established.
5. UPCQ is sent to GGSN with DTI information, UPCR is received from the GGSN.
5. UPCQ is sent to GGSN with DTI information, UPCR is received from the GGSN.
Customer Impact: When the GGSN tries to forward the downlink data to the RNC during PDP-modification
procedure initiated by GGSN, error-indication will not be received during the RAB-release and RAB re-assignment
procedures.
procedure initiated by GGSN, error-indication will not be received during the RAB-release and RAB re-assignment
procedures.
CSCus50162 - QOS : Incorrect Reliability Class Mapping from QCI=5
Feature Changes
Improve Reliability Class Mapping
During handovers involving Inter-RAT, some UEs experienced issues with existing behavior, which required the UEs to
be powered off/on (reboot) to acquire service. Those issues should be resolved with the behavior changes identified
below.
be powered off/on (reboot) to acquire service. Those issues should be resolved with the behavior changes identified
below.
Previous Behavior: In situations where the SDU error ratio = 10*-6, the MME and SGSN each implemented QoS
mapping of reliability class =2.
mapping of reliability class =2.
New Behavior: The MME and SGSN behavior has been modified such that in situations where the SDU error ratio =
10*-6, the MME and SGSN each implement QoS mapping of reliability class =3.
10*-6, the MME and SGSN each implement QoS mapping of reliability class =3.