4G LTE

Step 1: UE switched ON – Cell selection Step 2: UE to eNB – RRC connection request Step 3: eNB to UE – RRC connection set-up…

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…

The above is control plane architecture of LTE. If you observe the “NAS” layer is there UE and MME. “NAS” layer is not…

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…

The purpose of the EPS bearer context deactivation procedure is to deactivate an EPS bearer context or disconnect from a PDN by deactivating…

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…

The purpose of the dedicated EPS bearer context activation procedure is to establish an EPS bearer context with specific QoS and TFT between…

Authentication Procedure Authentication Failure Procedure The purpose of the EPS authentication and key agreement (AKA) procedure is to…

UECapabilityEnquiry The UECapabilityEnquiry message is used to request the transfer of UE radio access capabilities for E-UTRA as well as for…

Introduction to AS security: AS security is required to send the RRC messages securely between UE and eNB by using AS Security Keys. AS…