4g LTE: LTE NAS: Attach request
In this tutorial we shall see what is attach request and the Information Elements (IE) present in Attach Request. Attach Request is a NAS…
4g LTE: LTE OFDMA and Resource Block
In the previous chapters we learned about LTE Frame Structure. In this chapter we shall learn about OFDMA and Resource Block. First of all…
4g LTE: LTE NAS layer introduction and procedures
NAS layer : Non-Access Stratum: This is used to communicate control plane information between UE and MME. NAS layer protocols functions are to…
4g LTE: RRC Connection Re-Configuration Procedure
The purpose of this procedure is to: – Establish/modify/release RBs, – To perform Handover – To configure/modify…
4g LTE: RRC Connection Re-Establishment
This procedure will be initiated by UE on below scenarios: 1. Upon re-entry into service area after radio link failure 2. Handover failure 3.…
4g LTE: RRC Connection Release Procedure
RRC Connection Release procedure is used to release an RRC Connection. Here eNB initiates the RRC connection release procedure to the UE. Then…
4g LTE: RRC Connection Establishment Procedure
Once the Random access procedure is completed, the next step is to RRC connection establishment procedure. This procedure will change the…
4g LTE: LTE UE PLMN selection
Once the UE reads PSS and SSS, the next step is to select a PLMN in the initial acquisition procedure. UE will first scan all the available…
4g LTE: RRC Timers in LTE
T300: Start: Transmission of RRCConnectionRequest Stop: Reception of RRCConnectionSetup or RRCConnectionReject message, cell re-selection and…
4g LTE: LTE SBI1 and SIB2
In the previous 2 chapters we learn about MIB and different types of SIBs. In this chapter we shall learn more about SBI1 and SIB2. As these 2…