LTE QA

This is my technical note for LTE study.

Tuesday, August 25, 2020

Decoding SFN

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This one is interesting piece of puzzle. Normally the puzzle is MIB contains 8 bit info about SFN, then how does UE decode the 10 bit SFN ou...
Thursday, October 18, 2018

Identifiers in 5G

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PEI                    Permanent Equipment Identifier SUCI                Subscription Concealed Identifier SUPI                Subscrip...
Wednesday, August 8, 2018

How to inform a new TAI list to UE

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The easiest way to include a new TAI list to UE is GUTI REALLOCATION COMMAND. This Message includes a TAI list IE which is optional. Thi...

Access Class

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It is not intended that access control be used under normal operating conditions. The use of this facility allows the network operator to ...
Tuesday, August 7, 2018

X2AP procedures

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The X2 interface X2AP procedures are divided into two modules as follows: 1. X2AP Basic Mobility Procedures;  2. X2AP Global Procedures;...
Thursday, August 2, 2018

PTI Procedure Transaction Identity

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Procedure Transaction Identity: An identity which is dynamically allocated by the UE for the UE requested ESM procedures. The procedure tr...

LTE PDN CONNECTIVITY REQUEST message content

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Request Type (9.9.4.14) Based on 10.5.6.17 Request type of 24.008 The purpose of the Request type information element is to indicate w...

IMS voice call concurrency handling scenarios

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SIM1 status SIM2 event SIM2 action Active call on Wi-Fi (VoWiFi) Receives IMS call (SIP INVITE) over Wi...
Friday, July 6, 2018

RRC state Machine in 5G 38.331

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A UE is either in RRC_CONNECTED state or in RRC_INACTIVE state when an RRC connection has been established. If this is not the case, i....
Monday, March 12, 2018

SIB for Handovers

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From To Mandatory SIB's Optiional SIB's LTE LTE SIB1 SIB2 SI...
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