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Telecom Articles by Samir Amberkar
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2.1
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3GPP Modem
Simulator
Test Your
Knowledge
LTE UE NAS overview
Idle mode function - PLMN (& RAT) selection
0)
Last registered PLMN
√
1)
EHPLMN (EFehplmn)
√
2)
HPLMN (IMSI) (and AcT from EFhplmnact)
√
3)
User controlled PLMN with AcT (EFplmnwact)
√
4)
Opeartor controlled PLMN with AcT (EFoplmnwact)
√
5)
Other PLMN/AcT with high signal quality, random order
√
6)
Other PLMN/AcT with decreasing signal quality
√
* PLMN is not forbidden (EFfplmn)
Copyright © Samir Amberkar
Slide 8 of 16
Notes
LTE Allocations Explained
3GPP TS 23.122 "NAS functions in UE idle mode"
3GPP TS 31.102 "USIM application"
List of all referred specifications along with their 3GPP locations is available
here
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