[5g NR] UE registration management status

Catalog

5GS Registration management status

RM-DEREGISTERED state

RM-REGISTERED state

5GS Registration management state model

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5GS Registration management status

stay UE and AMF Using two RM state , reflect UE In the selected PLMN Registration status in ：

• RM-DEREGISTERED.
• RM-REGISTERED.

RM-DEREGISTERED state

RM-DEREGISTERED State means UE Not registered with the network . In this state , stay AMF Medium UE In the context of , There is no the UE Valid location or routing information for , therefore AMF Can't get to UE. but UE Part of the context information can still be stored in UE and AMF in , Avoid identity authentication during each registration process .

about UE On one side , stay RM-DEREGISTERED State, , The operation is as follows ：

• If selected PLMN Receive the services that need to be registered , Then try to use Initial Registration The process registers with it ;
• If the initial registration receives Registration Reject, Keep it RM-DEREGISTERED state ;
• received Registration Accept after , Convert to RM-REGISTERED state .

about AMF On one side , When AMF Medium UE RM Status as RM-DEREGISTERED when , The operation is as follows ：

• received UE After your registration request , If receiving registration , Then to the UE send out Registration Accept To accept UE Initial registration of , Will be UE RM State transition to RM-REGISTERED.
• If you refuse UE register , Then to the UE send out Registration Reject.

RM-REGISTERED state

RM-REGISTERED State means UE Registered with the network .

about UE On the side , stay RM-REGISTERED State, , The operation is as follows ：

• If the current of the service cell TAI be not in UE Of TAI In the list , Then immediately execute the mobility registration update process , keep UE Registration status , send AMF Capable of paging UE;
• Execute the periodic registration update process triggered by the expiration of the periodic update timer , To notify the network UE Still active .
• Perform the mobility registration update process to update UE Capability information or renegotiate protocol parameters with the network ;
• When UE No need to talk to PLMN Registration time , Execute the logout process , And enter RM-DEREGISTERED state .UE You can decide to log out of the network at any time .
• received Registration Reject or Deregistration When the news , Get into RM-DEREGISTERED state .UE The subsequent actions of depend on Registration Reject or Deregistration The reason value carried in the message .

about AMF On one side , When AMF Medium UE RM Status as RM-REGISTERED when , The operation is as follows ：

• When UE No need to talk to PLMN Registration time , Execute the logout procedure , take UE Convert to RM-DEREGISTERED state . The network can decide to log off at any time UE;
• Implicit Deregistration The timer expires , At any time Implicit Deregistration, And will UE State transition to RM-DEREGISTERED state ;
• AMF Can accept or reject from UE Of Registration Requests or Service Requests.

5GS Registration management state model

UE and AMF State model in