If a LTE UE Roams in a WCDMA area and originates a Create_PDP_Context_Request with PDP_TYPE as IPv4v6. If SGSN does not support this PDP type then what is expected behavior by SGSN?
SGSN will create PDP context for supported PDP type and send UE with Appropriate cause value .
I guess it will reject the message with cause "service not supported"
I am looking for scenarios in which MME/SGSN purges an UE. And also what these nodes do as part of this procedure.
From UE point of view, I want to know when UE triggers integrity protected Attach request and when it sends as plain message ?
