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As per 3GPP TS 23.401 Annex D.3.6 step 6, "Security functions may be executed" during TAU (UE cell reselection 2g->4g). The idea is that the 4G network should check the integrity of the TAU, and only if iexisting and valid then accept it right away. Otherwise, an authorization procedure is started. Until now, during 2g->4g TAU we were retrieving and acking the PDP Context received from the SGSN and creating the session against the SGW right away. Tests done so far with real phones ended up in unsuccesful results when tring to reuse the 4g context derived from 2g, due to yet unknown reasons. Hence, with this patch we simply force for now the re-auth and recreation of security context before completing the TAU. This showed good results during testing with real phones. The security context is recreated through: * S6a 3gpp-Authentication-Info towards HSS * S1AP/NAS Authentication Request+Response towards UE * SecurityModeCommand towards UE. This patch is the first step towards delaying SGSN Context Ack after the whole authentication is done against the UE. Patches are splitted for ease of review. This patch is only delaying session setup after the S6a procedure. Follow-up patch will delay it further.
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