求助 - 5G 知识多选题

每一道题都是不定向选择题，正确 60% 才能通过，每次交卷后，只能看到: [答对 x 题, 部分正确 y 题, 错误 z 题]，但是不知道具体每道题是否正确，所以爬虫思维不是很好用

求了解 5G 的大佬指点

The Mobility Registration Update procedure is performed when:

• Whenever the UE changes Tracking Area
• Whenever the UE changes Registration Area
• UE requests AMF change
• UE requests a slice change

The 5G Registration can be of type:

• Periodic Update
• Mobility Update
• Communication Update
• Initial

During the Registration procedure a UE can request:

• Periodic Update timer value
• DRX parameters
• Change of IP address
• MICO mode

A Registered UE:

• May be not available for incoming connections
• Can be registered for either 3GPP access, non-3GPP access, or both
• Performs Service Area Updates
• Performs 5G Tracking Area Updates

MICO Mode:

• Makes the UE unreachable for paging
• Saves the UE battery
• Can be requested by the UE
• Can only be used by stationary devices

The Periodic Registration Update procedure is performed:

• In the roaming case - towards an AMF in the home network
• Upon expiry of a UE-specific timer
• In the roaming case - towards an AMF in the visited network
• Upon expiry of a Tracking-Area specific timer

The RM State machine runs in the:

• SMF
• hAMF
• UE
• vAMF

In order to save the UE battery:

• MICO mode might be used
• MEC is used
• DRX is used
• LADN might be used

At Registration the UE can identify itself in the Registration Request using:

• 5G-GUTI
• SUCI
• PEI
• SUPI

SUCI De-concealment is performed in the:

• UDR
• NRF
• UDM
• AMF