CPC H04W 12/106 (2021.01) [H04W 8/08 (2013.01); H04W 8/18 (2013.01); H04W 12/04 (2013.01); H04W 12/06 (2013.01); H04W 12/75 (2021.01); H04W 36/0038 (2013.01); H04W 60/00 (2013.01); H04W 36/1443 (2023.05); H04W 84/042 (2013.01)] | 20 Claims |
1. A system, comprising:
a first access and mobility management function (AMF) configured to:
receive a first registration request message from a user equipment (UE) after the UE is handed over from a 4G communication system to a 5G communication system,
wherein the first AMF is part of the 5G communication system;
validate integrity of the first registration request message; and
send a second request message to a second AMF if the integrity of the first registration request message is successfully validated; and
a second AMF configured to:
receive the second request message; and
send a 5G security context of the UE to the first AMF if the second request message carries indication information and the indication information indicates that the UE is validated, wherein the second request message is configured to cause the second AMF to skip verifying the UE, and wherein the second AMF is part of the 5G communication system.
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