name: CM-CONNECTED
full_form: Connected STATE
context: The control of 5G Access Stratum-based Time Distribution for a UE is performed by the AMF according to parameters retrieved in the Access and Mobility Subscription data. Figure 4.28.2.1-1: Subscription-based control of 5G access stratum-based time distribution 1. The UE performs the registration procedure as described in clause 4.2.2.2.2. The AMF retrieves the Access and Mobility Subscription data including the Access Stratum Time Synchronization Service Authorization. The Access and Mobility Subscription data may further include the Uu time synchronization error budget, one or more periods of start and stop times defining active times, a coverage area, clock quality detail level, and the acceptance criteria for the UE, as described in clause 5.27.1.11 of TS 23.501[ System architecture for the 5G System (5GS) ]  [2]. As part of this, the AMF shall, if supported, store the 5G access stratum time distribution indication (enable, disable), the Uu time synchronization error budget, clock quality detail level and clock quality acceptance criteria, and the UE reconnection indication in the UE context in AMF. 2. The AMF performs the control according to the subscription data as follows. If the AMF receives start and stop times then the AMF sends the message to the NG-RAN to enable or disable the 5G access stratum time distribution according to the expiry of start and stop times if the UE is in CM-CONNECTED state. If the UE is in CM-IDLE state when a Start time condition is met, then the AMF pages the UE and provides the 5G access stratum distribution indication to NG-RAN as part of the subsequent service request procedure initiated by the UE in the response to the paging. If the AMF received Time Synchronization Coverage Area information as part of the Access and Mobility Subscription data including the Access Stratum Time Synchronization Service Authorization, the AMF determines if the Coverage Area information shall trigger an activation or deactivation of the access stratum time distribution: - If the UE has moved inside the Coverage Area, then the AMF determines to enable access stratum time distribution for the UE. - If the UE has moved outside the Coverage Area, then the AMF determines to disable access stratum time distribution for the UE. The AMF determines whether the UE moves inside/outside of the Coverage Area specified in the clause 5.27.1.11 of TS 23.501[ System architecture for the 5G System (5GS) ]  [2] The AMF shall send the UE reconnection indication to the UE updating the UE configuration as defined in clause 4.2.2 or clause 4.2.4.2. 3. The AMF sends N2 message (UE Context Modification Request) to the NG-RAN. The AMF sends the 5G access stratum time distribution indication (enable, disable), the Uu time synchronization error budget, clock quality detail level and clock quality acceptance criteria when they are available, to NG-RAN during mobility registration, AM policy modification, Service Request, N2 Handover and Xn handover as specified in TS 38.413[ NG-RAN; NG Application Protocol (NGAP) ]  [10]. The NG-RAN node shall, if supported, store the information in the UE Context. Based on this information, the NG-RAN node provides the 5GS access stratum time to the UE according to the Uu time synchronization error budget as provided by the TSCTSF (if supported by UE and NG-RAN) and NG-RAN provides timing synchronization status reports to the UE (as described in clause 4.15.9.5.2).
description: CM-CONNECTED refers to a state of the User Equipment (UE) where it is connected to the network and has an active connection, enabling it to receive services such as access stratum time distribution. This state is crucial for the UE to maintain synchronization with the network's timing signals.
explanation: CM-CONNECTED is classified as a State because it describes a specific condition or status of the User Equipment (UE) in relation to its connection with the network, which directly influences the control and management of access stratum time distribution services by the Access and Mobility Management Function (AMF).
section_title: 4.28.2.1 Control of access stratum time synchronization service without AF request
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