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NAS layer : Non-Access Stratum: This is used to communicate control plane information between UE and MME. NAS layer protocols functions are to…

In this chapter we shall see the keys exchanged between different procedures. Below security flows is a smaller part in LTE Attach Request. To…

  Step 1: UE will read MIB and SIB from network to synchronize with the network. Step 2: UE will send Random Access Preamble (RAP)…

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…

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…