4g LTE: LTE RRC: Initial security activation
Introduction to AS security: AS security is required to send the RRC messages securely between UE and eNB by using AS Security Keys. AS…
4g LTE: LTE NAS: Identification procedure
The messages in this procedure are: IDENTITY REQUEST IDENTITY RESPONSE IDENTITY REQUEST The identification procedure is used by the network…
4g LTE: LTE NAS: Security Mode Control Procedure
The purpose of the NAS Security Mode Control Procedure is to take an EPS security context into use, and initialise and start NAS signalling…
4g LTE: LTE NAS: Default EPS bearer context activation procedure
The purpose of the default bearer context activation procedure is to establish a default EPS bearer context between the UE and the EPC. The…
4g LTE: Attach complete
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…
4g LTE: Attach reject
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…
4g LTE: Attach accept
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…
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…