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 84/042 (2013.01)] | 23 Claims |
1. A method of obtaining a security context of a user equipment (UE), the method comprising:
receiving, by a first access and mobility management function (AMF), a first registration request message from the UE after a handover from a 4G communication system to a 5G communication system, wherein the first AMF is part of the 5G communication system;
validating, by the first AMF, integrity of the first registration request message based on a mapped security context that is determined based on a 4G security context, wherein the first registration request message is security protected by the mapped security context of the UE;
sending, by the first AMF, a second request message to a second AMF when the first AMF successfully validates the integrity of the first registration request message, wherein the second request message includes indication information that 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; and
receiving, by the first AMF, a 5G security context of the UE from the second AMF based on the second request message.
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