Patent ID: 11882433
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A communications system comprising:
a user equipment (UE) configured to:
receive, from a source access network device, a radio resource control (RRC) release message comprising suspend configuration information, wherein the suspend configuration information indicates the UE to enter an inactive state;
perform verification of integrity protection of the RRC release message using an RRC integrity protection key;
retain, when the verification succeeds, an inactive-radio network temporary identifier (I-RNTI) and first indication information, wherein the first indication information indicates a user plane security protection method used before the UE enters the inactive state from a connected state, and wherein the user plane security protection method indicates whether at least one of user plane encryption protection or user plane integrity protection is enabled; and
send an RRC resume request; and

a target access network device configured to:
receive, from the UE, the RRC resume request;
send, to the source access network device, a context information obtaining request comprising the I-RNTI;
receive, from the source access network device, a context information obtaining response comprising the first indication information;
activate, using the user plane security protection method, user plane security between the target access network device and the UE when the user plane security protection method can be supported; and
send an RRC resume message to the UE,

wherein the UE is further configured to activate, using the user plane security protection method, the user plane security when receiving the RRC resume message from the target access network device.