4g LTE: LTE Attach Procedure simple explanation with call flow diagram
Step 1: UE will read MIB and SIB from network to synchronize with the network. Step 2: UE will send Random Access Preamble (RAP)…
4g LTE: Detach Procedure
Detach Request can be initiated from UE or by the Network. We shall learn both types of detach request in this chapter. Below are the messages…
4g LTE: LTE Attach Procedure in bullet points
Step 1: UE switched ON – Cell selection Step 2: UE to eNB – RRC connection request Step 3: eNB to UE – RRC connection set-up…
4g LTE: LTE UE power on procedure or UE Initial Access Procedure
In this chapter we shall see on a high level what are the procedures that are followed what an UE is powered on. Below are the messages that…
4g LTE: LTE Piggybacked Concept with example
The above is control plane architecture of LTE. If you observe the “NAS” layer is there UE and MME. “NAS” layer is not…
4g LTE: PSS and SSS
Before we start with PSS and SSS, let us understand the Initial Access Procedure in LTE. So when a UE is switched on it will go through…
4g LTE: LTE NAS: EPS bearer context deactivation procedure
The purpose of the EPS bearer context deactivation procedure is to deactivate an EPS bearer context or disconnect from a PDN by deactivating…
4g LTE: LTE NAS: EPS bearer context modification procedure
The purpose of this procedure is to modify an EPS bearer context with a specific QoS and TFT. This procedure is initiated by network, it may…
4g LTE: LTE NAS: Dedicated EPS bearer context activation procedure
The purpose of the dedicated EPS bearer context activation procedure is to establish an EPS bearer context with specific QoS and TFT between…
4g LTE: LTE NAS: Authentication procedure
Authentication Procedure Authentication Failure Procedure The purpose of the EPS authentication and key agreement (AKA) procedure is to…