rmwambu
2012-06-11, 06:38 PM
Network accessibility in LTE requires different performance counters than those known in 2G and 3G radio access networks. If the definition can be agreed that a “call” is a single radio connection between the UE and the network that is used to transmit payload using multiple bearers and service flows, then all failures that prevent a UE from attaching to the network and enabling Public Data Network (PDN) connectivity can be summarized by the umbrella term “call setup failures.”
The strong link between attach to network and PDN connectivity is also reflected by the standards, especially 3GPP 24.301 “NAS Protocol for Evolved Packet System (EPS).” Here it is defined that in case of an unsuccessful attach an explicit PDP connection reject message should be sent to the UE to ensure proper transitions of EPS Mobility Management (EMM) and ESM (EPS Session Management) states in the UE’s NAS signaling entity. The illustration below shows READ FURTHER AT: http://trends-in-telecoms.blogspot.com/2012/06/call-setup-failures-in-lte.html
The strong link between attach to network and PDN connectivity is also reflected by the standards, especially 3GPP 24.301 “NAS Protocol for Evolved Packet System (EPS).” Here it is defined that in case of an unsuccessful attach an explicit PDP connection reject message should be sent to the UE to ensure proper transitions of EPS Mobility Management (EMM) and ESM (EPS Session Management) states in the UE’s NAS signaling entity. The illustration below shows READ FURTHER AT: http://trends-in-telecoms.blogspot.com/2012/06/call-setup-failures-in-lte.html