4G LTE

The messages in this procedure are: IDENTITY REQUEST IDENTITY RESPONSE IDENTITY REQUEST  The identification procedure is used by the network…

The purpose of the default bearer context activation procedure is to establish a default EPS bearer context between the UE and the EPC. The…

ATTACH COMPLETE is sent in response to ATTACH ACCEPT message. This message will be sent by UE to Network. Attach Complete is piggy backed with…

LTE attach accept message is sent by the network to UE. It is the response for ATTACH REQUEST. ATTACH REJECT will be sent by MME if ATTACH…

LTE attach accept message is sent by the network to UE. It is the response for ATTACH REQUEST. Similar to ATTACH REQUEST, ATTACH ACCEPT will…

In this tutorial we shall see what is attach request and the Information Elements (IE) present in Attach Request. Attach Request is a NAS…

In the previous chapters we learned about LTE Frame Structure. In this chapter we shall learn about OFDMA and Resource Block. First of all…

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

The purpose of this procedure is to: – Establish/modify/release RBs, – To perform Handover – To configure/modify…

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.…