这是一个创建于 1932 天前的主题，其中的信息可能已经有所发展或是发生改变。
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
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