UE NITZ Display: Feature Description
The NITZ feature supports the following attributes:
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Full Network Name: The complete name of the network.
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Short Network Name: An abbreviated version of the network name.
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Local Time Zone: The time zone specific to the local area.
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Universal Time Zone: The Coordinated Universal Time (UTC) zone.
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Network Daylight Saving Time: Information about daylight saving time adjustments.
The NITZ information is sent to the UE by AMF as a part of UeConfigurationUpdate messages. NITZ UeConfigurationUpdate messages are triggered under specific conditions, such as:
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Initial Registration: When a UE registers with AMF for the first time.
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Mobility Registration with AMF Change: When a UE moves and changes its AMF.
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Periodic Registration or Local Mobility: Only if the configuration has changed since the last update to the UE.
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Other Trigger Reasons: Such as slice change, where NITZ information is included and has changed since the last update.
The Time zone IE indicates the local time zone of the network. This information needs to be included in several types of messages exchanged between different network functions to ensure that the UE and the network are synchronized in terms of time zone information. Time zone IE is filled in the applicable messages towards SMF/PCF/AMF.
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